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-rw-r--r--kernel/Makefile2
-rw-r--r--kernel/acct.c7
-rw-r--r--kernel/auditsc.c255
-rw-r--r--kernel/capability.c288
-rw-r--r--kernel/cgroup.c17
-rw-r--r--kernel/cred-internals.h21
-rw-r--r--kernel/cred.c577
-rw-r--r--kernel/exit.c23
-rw-r--r--kernel/fork.c44
-rw-r--r--kernel/futex.c20
-rw-r--r--kernel/futex_compat.c7
-rw-r--r--kernel/kmod.c30
-rw-r--r--kernel/ptrace.c29
-rw-r--r--kernel/sched.c26
-rw-r--r--kernel/signal.c60
-rw-r--r--kernel/sys.c584
-rw-r--r--kernel/sysctl.c2
-rw-r--r--kernel/timer.c8
-rw-r--r--kernel/trace/trace.c2
-rw-r--r--kernel/tsacct.c6
-rw-r--r--kernel/uid16.c31
-rw-r--r--kernel/user.c37
-rw-r--r--kernel/user_namespace.c14
-rw-r--r--kernel/workqueue.c8
24 files changed, 1413 insertions, 685 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 9a3ec66a9d84..5a6a612c302d 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -9,7 +9,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
9 rcupdate.o extable.o params.o posix-timers.o \ 9 rcupdate.o extable.o params.o posix-timers.o \
10 kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \ 10 kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ 11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o 12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o
13 13
14CFLAGS_REMOVE_sched.o = -mno-spe 14CFLAGS_REMOVE_sched.o = -mno-spe
15 15
diff --git a/kernel/acct.c b/kernel/acct.c
index f6006a60df5d..d57b7cbb98b6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -530,15 +530,14 @@ static void do_acct_process(struct bsd_acct_struct *acct,
530 do_div(elapsed, AHZ); 530 do_div(elapsed, AHZ);
531 ac.ac_btime = get_seconds() - elapsed; 531 ac.ac_btime = get_seconds() - elapsed;
532 /* we really need to bite the bullet and change layout */ 532 /* we really need to bite the bullet and change layout */
533 ac.ac_uid = current->uid; 533 current_uid_gid(&ac.ac_uid, &ac.ac_gid);
534 ac.ac_gid = current->gid;
535#if ACCT_VERSION==2 534#if ACCT_VERSION==2
536 ac.ac_ahz = AHZ; 535 ac.ac_ahz = AHZ;
537#endif 536#endif
538#if ACCT_VERSION==1 || ACCT_VERSION==2 537#if ACCT_VERSION==1 || ACCT_VERSION==2
539 /* backward-compatible 16 bit fields */ 538 /* backward-compatible 16 bit fields */
540 ac.ac_uid16 = current->uid; 539 ac.ac_uid16 = ac.ac_uid;
541 ac.ac_gid16 = current->gid; 540 ac.ac_gid16 = ac.ac_gid;
542#endif 541#endif
543#if ACCT_VERSION==3 542#if ACCT_VERSION==3
544 ac.ac_pid = task_tgid_nr_ns(current, ns); 543 ac.ac_pid = task_tgid_nr_ns(current, ns);
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cf5bc2f5f9c3..bc1e2d854bf6 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,6 +65,7 @@
65#include <linux/highmem.h> 65#include <linux/highmem.h>
66#include <linux/syscalls.h> 66#include <linux/syscalls.h>
67#include <linux/inotify.h> 67#include <linux/inotify.h>
68#include <linux/capability.h>
68 69
69#include "audit.h" 70#include "audit.h"
70 71
@@ -84,6 +85,15 @@ int audit_n_rules;
84/* determines whether we collect data for signals sent */ 85/* determines whether we collect data for signals sent */
85int audit_signals; 86int audit_signals;
86 87
88struct audit_cap_data {
89 kernel_cap_t permitted;
90 kernel_cap_t inheritable;
91 union {
92 unsigned int fE; /* effective bit of a file capability */
93 kernel_cap_t effective; /* effective set of a process */
94 };
95};
96
87/* When fs/namei.c:getname() is called, we store the pointer in name and 97/* When fs/namei.c:getname() is called, we store the pointer in name and
88 * we don't let putname() free it (instead we free all of the saved 98 * we don't let putname() free it (instead we free all of the saved
89 * pointers at syscall exit time). 99 * pointers at syscall exit time).
@@ -100,6 +110,8 @@ struct audit_names {
100 gid_t gid; 110 gid_t gid;
101 dev_t rdev; 111 dev_t rdev;
102 u32 osid; 112 u32 osid;
113 struct audit_cap_data fcap;
114 unsigned int fcap_ver;
103}; 115};
104 116
105struct audit_aux_data { 117struct audit_aux_data {
@@ -184,6 +196,20 @@ struct audit_aux_data_pids {
184 int pid_count; 196 int pid_count;
185}; 197};
186 198
199struct audit_aux_data_bprm_fcaps {
200 struct audit_aux_data d;
201 struct audit_cap_data fcap;
202 unsigned int fcap_ver;
203 struct audit_cap_data old_pcap;
204 struct audit_cap_data new_pcap;
205};
206
207struct audit_aux_data_capset {
208 struct audit_aux_data d;
209 pid_t pid;
210 struct audit_cap_data cap;
211};
212
187struct audit_tree_refs { 213struct audit_tree_refs {
188 struct audit_tree_refs *next; 214 struct audit_tree_refs *next;
189 struct audit_chunk *c[31]; 215 struct audit_chunk *c[31];
@@ -421,6 +447,7 @@ static int audit_filter_rules(struct task_struct *tsk,
421 struct audit_names *name, 447 struct audit_names *name,
422 enum audit_state *state) 448 enum audit_state *state)
423{ 449{
450 const struct cred *cred = get_task_cred(tsk);
424 int i, j, need_sid = 1; 451 int i, j, need_sid = 1;
425 u32 sid; 452 u32 sid;
426 453
@@ -440,28 +467,28 @@ static int audit_filter_rules(struct task_struct *tsk,
440 } 467 }
441 break; 468 break;
442 case AUDIT_UID: 469 case AUDIT_UID:
443 result = audit_comparator(tsk->uid, f->op, f->val); 470 result = audit_comparator(cred->uid, f->op, f->val);
444 break; 471 break;
445 case AUDIT_EUID: 472 case AUDIT_EUID:
446 result = audit_comparator(tsk->euid, f->op, f->val); 473 result = audit_comparator(cred->euid, f->op, f->val);
447 break; 474 break;
448 case AUDIT_SUID: 475 case AUDIT_SUID:
449 result = audit_comparator(tsk->suid, f->op, f->val); 476 result = audit_comparator(cred->suid, f->op, f->val);
450 break; 477 break;
451 case AUDIT_FSUID: 478 case AUDIT_FSUID:
452 result = audit_comparator(tsk->fsuid, f->op, f->val); 479 result = audit_comparator(cred->fsuid, f->op, f->val);
453 break; 480 break;
454 case AUDIT_GID: 481 case AUDIT_GID:
455 result = audit_comparator(tsk->gid, f->op, f->val); 482 result = audit_comparator(cred->gid, f->op, f->val);
456 break; 483 break;
457 case AUDIT_EGID: 484 case AUDIT_EGID:
458 result = audit_comparator(tsk->egid, f->op, f->val); 485 result = audit_comparator(cred->egid, f->op, f->val);
459 break; 486 break;
460 case AUDIT_SGID: 487 case AUDIT_SGID:
461 result = audit_comparator(tsk->sgid, f->op, f->val); 488 result = audit_comparator(cred->sgid, f->op, f->val);
462 break; 489 break;
463 case AUDIT_FSGID: 490 case AUDIT_FSGID:
464 result = audit_comparator(tsk->fsgid, f->op, f->val); 491 result = audit_comparator(cred->fsgid, f->op, f->val);
465 break; 492 break;
466 case AUDIT_PERS: 493 case AUDIT_PERS:
467 result = audit_comparator(tsk->personality, f->op, f->val); 494 result = audit_comparator(tsk->personality, f->op, f->val);
@@ -615,8 +642,10 @@ static int audit_filter_rules(struct task_struct *tsk,
615 break; 642 break;
616 } 643 }
617 644
618 if (!result) 645 if (!result) {
646 put_cred(cred);
619 return 0; 647 return 0;
648 }
620 } 649 }
621 if (rule->filterkey && ctx) 650 if (rule->filterkey && ctx)
622 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC); 651 ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@@ -624,6 +653,7 @@ static int audit_filter_rules(struct task_struct *tsk,
624 case AUDIT_NEVER: *state = AUDIT_DISABLED; break; 653 case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
625 case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; 654 case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
626 } 655 }
656 put_cred(cred);
627 return 1; 657 return 1;
628} 658}
629 659
@@ -1171,8 +1201,38 @@ static void audit_log_execve_info(struct audit_context *context,
1171 kfree(buf); 1201 kfree(buf);
1172} 1202}
1173 1203
1204static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
1205{
1206 int i;
1207
1208 audit_log_format(ab, " %s=", prefix);
1209 CAP_FOR_EACH_U32(i) {
1210 audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
1211 }
1212}
1213
1214static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
1215{
1216 kernel_cap_t *perm = &name->fcap.permitted;
1217 kernel_cap_t *inh = &name->fcap.inheritable;
1218 int log = 0;
1219
1220 if (!cap_isclear(*perm)) {
1221 audit_log_cap(ab, "cap_fp", perm);
1222 log = 1;
1223 }
1224 if (!cap_isclear(*inh)) {
1225 audit_log_cap(ab, "cap_fi", inh);
1226 log = 1;
1227 }
1228
1229 if (log)
1230 audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
1231}
1232
1174static void audit_log_exit(struct audit_context *context, struct task_struct *tsk) 1233static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
1175{ 1234{
1235 const struct cred *cred;
1176 int i, call_panic = 0; 1236 int i, call_panic = 0;
1177 struct audit_buffer *ab; 1237 struct audit_buffer *ab;
1178 struct audit_aux_data *aux; 1238 struct audit_aux_data *aux;
@@ -1182,14 +1242,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
1182 context->pid = tsk->pid; 1242 context->pid = tsk->pid;
1183 if (!context->ppid) 1243 if (!context->ppid)
1184 context->ppid = sys_getppid(); 1244 context->ppid = sys_getppid();
1185 context->uid = tsk->uid; 1245 cred = current_cred();
1186 context->gid = tsk->gid; 1246 context->uid = cred->uid;
1187 context->euid = tsk->euid; 1247 context->gid = cred->gid;
1188 context->suid = tsk->suid; 1248 context->euid = cred->euid;
1189 context->fsuid = tsk->fsuid; 1249 context->suid = cred->suid;
1190 context->egid = tsk->egid; 1250 context->fsuid = cred->fsuid;
1191 context->sgid = tsk->sgid; 1251 context->egid = cred->egid;
1192 context->fsgid = tsk->fsgid; 1252 context->sgid = cred->sgid;
1253 context->fsgid = cred->fsgid;
1193 context->personality = tsk->personality; 1254 context->personality = tsk->personality;
1194 1255
1195 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL); 1256 ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
@@ -1334,6 +1395,28 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
1334 audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]); 1395 audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
1335 break; } 1396 break; }
1336 1397
1398 case AUDIT_BPRM_FCAPS: {
1399 struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
1400 audit_log_format(ab, "fver=%x", axs->fcap_ver);
1401 audit_log_cap(ab, "fp", &axs->fcap.permitted);
1402 audit_log_cap(ab, "fi", &axs->fcap.inheritable);
1403 audit_log_format(ab, " fe=%d", axs->fcap.fE);
1404 audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
1405 audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
1406 audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
1407 audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
1408 audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
1409 audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
1410 break; }
1411
1412 case AUDIT_CAPSET: {
1413 struct audit_aux_data_capset *axs = (void *)aux;
1414 audit_log_format(ab, "pid=%d", axs->pid);
1415 audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
1416 audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
1417 audit_log_cap(ab, "cap_pe", &axs->cap.effective);
1418 break; }
1419
1337 } 1420 }
1338 audit_log_end(ab); 1421 audit_log_end(ab);
1339 } 1422 }
@@ -1421,6 +1504,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
1421 } 1504 }
1422 } 1505 }
1423 1506
1507 audit_log_fcaps(ab, n);
1508
1424 audit_log_end(ab); 1509 audit_log_end(ab);
1425 } 1510 }
1426 1511
@@ -1787,8 +1872,36 @@ static int audit_inc_name_count(struct audit_context *context,
1787 return 0; 1872 return 0;
1788} 1873}
1789 1874
1875
1876static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry)
1877{
1878 struct cpu_vfs_cap_data caps;
1879 int rc;
1880
1881 memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t));
1882 memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t));
1883 name->fcap.fE = 0;
1884 name->fcap_ver = 0;
1885
1886 if (!dentry)
1887 return 0;
1888
1889 rc = get_vfs_caps_from_disk(dentry, &caps);
1890 if (rc)
1891 return rc;
1892
1893 name->fcap.permitted = caps.permitted;
1894 name->fcap.inheritable = caps.inheritable;
1895 name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
1896 name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
1897
1898 return 0;
1899}
1900
1901
1790/* Copy inode data into an audit_names. */ 1902/* Copy inode data into an audit_names. */
1791static void audit_copy_inode(struct audit_names *name, const struct inode *inode) 1903static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
1904 const struct inode *inode)
1792{ 1905{
1793 name->ino = inode->i_ino; 1906 name->ino = inode->i_ino;
1794 name->dev = inode->i_sb->s_dev; 1907 name->dev = inode->i_sb->s_dev;
@@ -1797,6 +1910,7 @@ static void audit_copy_inode(struct audit_names *name, const struct inode *inode
1797 name->gid = inode->i_gid; 1910 name->gid = inode->i_gid;
1798 name->rdev = inode->i_rdev; 1911 name->rdev = inode->i_rdev;
1799 security_inode_getsecid(inode, &name->osid); 1912 security_inode_getsecid(inode, &name->osid);
1913 audit_copy_fcaps(name, dentry);
1800} 1914}
1801 1915
1802/** 1916/**
@@ -1831,7 +1945,7 @@ void __audit_inode(const char *name, const struct dentry *dentry)
1831 context->names[idx].name = NULL; 1945 context->names[idx].name = NULL;
1832 } 1946 }
1833 handle_path(dentry); 1947 handle_path(dentry);
1834 audit_copy_inode(&context->names[idx], inode); 1948 audit_copy_inode(&context->names[idx], dentry, inode);
1835} 1949}
1836 1950
1837/** 1951/**
@@ -1892,7 +2006,7 @@ void __audit_inode_child(const char *dname, const struct dentry *dentry,
1892 if (!strcmp(dname, n->name) || 2006 if (!strcmp(dname, n->name) ||
1893 !audit_compare_dname_path(dname, n->name, &dirlen)) { 2007 !audit_compare_dname_path(dname, n->name, &dirlen)) {
1894 if (inode) 2008 if (inode)
1895 audit_copy_inode(n, inode); 2009 audit_copy_inode(n, NULL, inode);
1896 else 2010 else
1897 n->ino = (unsigned long)-1; 2011 n->ino = (unsigned long)-1;
1898 found_child = n->name; 2012 found_child = n->name;
@@ -1906,7 +2020,7 @@ add_names:
1906 return; 2020 return;
1907 idx = context->name_count - 1; 2021 idx = context->name_count - 1;
1908 context->names[idx].name = NULL; 2022 context->names[idx].name = NULL;
1909 audit_copy_inode(&context->names[idx], parent); 2023 audit_copy_inode(&context->names[idx], NULL, parent);
1910 } 2024 }
1911 2025
1912 if (!found_child) { 2026 if (!found_child) {
@@ -1927,7 +2041,7 @@ add_names:
1927 } 2041 }
1928 2042
1929 if (inode) 2043 if (inode)
1930 audit_copy_inode(&context->names[idx], inode); 2044 audit_copy_inode(&context->names[idx], NULL, inode);
1931 else 2045 else
1932 context->names[idx].ino = (unsigned long)-1; 2046 context->names[idx].ino = (unsigned long)-1;
1933 } 2047 }
@@ -1978,7 +2092,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
1978 audit_log_format(ab, "login pid=%d uid=%u " 2092 audit_log_format(ab, "login pid=%d uid=%u "
1979 "old auid=%u new auid=%u" 2093 "old auid=%u new auid=%u"
1980 " old ses=%u new ses=%u", 2094 " old ses=%u new ses=%u",
1981 task->pid, task->uid, 2095 task->pid, task_uid(task),
1982 task->loginuid, loginuid, 2096 task->loginuid, loginuid,
1983 task->sessionid, sessionid); 2097 task->sessionid, sessionid);
1984 audit_log_end(ab); 2098 audit_log_end(ab);
@@ -2361,7 +2475,7 @@ void __audit_ptrace(struct task_struct *t)
2361 2475
2362 context->target_pid = t->pid; 2476 context->target_pid = t->pid;
2363 context->target_auid = audit_get_loginuid(t); 2477 context->target_auid = audit_get_loginuid(t);
2364 context->target_uid = t->uid; 2478 context->target_uid = task_uid(t);
2365 context->target_sessionid = audit_get_sessionid(t); 2479 context->target_sessionid = audit_get_sessionid(t);
2366 security_task_getsecid(t, &context->target_sid); 2480 security_task_getsecid(t, &context->target_sid);
2367 memcpy(context->target_comm, t->comm, TASK_COMM_LEN); 2481 memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@@ -2380,6 +2494,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
2380 struct audit_aux_data_pids *axp; 2494 struct audit_aux_data_pids *axp;
2381 struct task_struct *tsk = current; 2495 struct task_struct *tsk = current;
2382 struct audit_context *ctx = tsk->audit_context; 2496 struct audit_context *ctx = tsk->audit_context;
2497 uid_t uid = current_uid(), t_uid = task_uid(t);
2383 2498
2384 if (audit_pid && t->tgid == audit_pid) { 2499 if (audit_pid && t->tgid == audit_pid) {
2385 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) { 2500 if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@@ -2387,7 +2502,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
2387 if (tsk->loginuid != -1) 2502 if (tsk->loginuid != -1)
2388 audit_sig_uid = tsk->loginuid; 2503 audit_sig_uid = tsk->loginuid;
2389 else 2504 else
2390 audit_sig_uid = tsk->uid; 2505 audit_sig_uid = uid;
2391 security_task_getsecid(tsk, &audit_sig_sid); 2506 security_task_getsecid(tsk, &audit_sig_sid);
2392 } 2507 }
2393 if (!audit_signals || audit_dummy_context()) 2508 if (!audit_signals || audit_dummy_context())
@@ -2399,7 +2514,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
2399 if (!ctx->target_pid) { 2514 if (!ctx->target_pid) {
2400 ctx->target_pid = t->tgid; 2515 ctx->target_pid = t->tgid;
2401 ctx->target_auid = audit_get_loginuid(t); 2516 ctx->target_auid = audit_get_loginuid(t);
2402 ctx->target_uid = t->uid; 2517 ctx->target_uid = t_uid;
2403 ctx->target_sessionid = audit_get_sessionid(t); 2518 ctx->target_sessionid = audit_get_sessionid(t);
2404 security_task_getsecid(t, &ctx->target_sid); 2519 security_task_getsecid(t, &ctx->target_sid);
2405 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); 2520 memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@@ -2420,7 +2535,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
2420 2535
2421 axp->target_pid[axp->pid_count] = t->tgid; 2536 axp->target_pid[axp->pid_count] = t->tgid;
2422 axp->target_auid[axp->pid_count] = audit_get_loginuid(t); 2537 axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
2423 axp->target_uid[axp->pid_count] = t->uid; 2538 axp->target_uid[axp->pid_count] = t_uid;
2424 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); 2539 axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
2425 security_task_getsecid(t, &axp->target_sid[axp->pid_count]); 2540 security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
2426 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); 2541 memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
@@ -2430,6 +2545,86 @@ int __audit_signal_info(int sig, struct task_struct *t)
2430} 2545}
2431 2546
2432/** 2547/**
2548 * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
2549 * @bprm: pointer to the bprm being processed
2550 * @new: the proposed new credentials
2551 * @old: the old credentials
2552 *
2553 * Simply check if the proc already has the caps given by the file and if not
2554 * store the priv escalation info for later auditing at the end of the syscall
2555 *
2556 * -Eric
2557 */
2558int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
2559 const struct cred *new, const struct cred *old)
2560{
2561 struct audit_aux_data_bprm_fcaps *ax;
2562 struct audit_context *context = current->audit_context;
2563 struct cpu_vfs_cap_data vcaps;
2564 struct dentry *dentry;
2565
2566 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2567 if (!ax)
2568 return -ENOMEM;
2569
2570 ax->d.type = AUDIT_BPRM_FCAPS;
2571 ax->d.next = context->aux;
2572 context->aux = (void *)ax;
2573
2574 dentry = dget(bprm->file->f_dentry);
2575 get_vfs_caps_from_disk(dentry, &vcaps);
2576 dput(dentry);
2577
2578 ax->fcap.permitted = vcaps.permitted;
2579 ax->fcap.inheritable = vcaps.inheritable;
2580 ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
2581 ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
2582
2583 ax->old_pcap.permitted = old->cap_permitted;
2584 ax->old_pcap.inheritable = old->cap_inheritable;
2585 ax->old_pcap.effective = old->cap_effective;
2586
2587 ax->new_pcap.permitted = new->cap_permitted;
2588 ax->new_pcap.inheritable = new->cap_inheritable;
2589 ax->new_pcap.effective = new->cap_effective;
2590 return 0;
2591}
2592
2593/**
2594 * __audit_log_capset - store information about the arguments to the capset syscall
2595 * @pid: target pid of the capset call
2596 * @new: the new credentials
2597 * @old: the old (current) credentials
2598 *
2599 * Record the aguments userspace sent to sys_capset for later printing by the
2600 * audit system if applicable
2601 */
2602int __audit_log_capset(pid_t pid,
2603 const struct cred *new, const struct cred *old)
2604{
2605 struct audit_aux_data_capset *ax;
2606 struct audit_context *context = current->audit_context;
2607
2608 if (likely(!audit_enabled || !context || context->dummy))
2609 return 0;
2610
2611 ax = kmalloc(sizeof(*ax), GFP_KERNEL);
2612 if (!ax)
2613 return -ENOMEM;
2614
2615 ax->d.type = AUDIT_CAPSET;
2616 ax->d.next = context->aux;
2617 context->aux = (void *)ax;
2618
2619 ax->pid = pid;
2620 ax->cap.effective = new->cap_effective;
2621 ax->cap.inheritable = new->cap_effective;
2622 ax->cap.permitted = new->cap_permitted;
2623
2624 return 0;
2625}
2626
2627/**
2433 * audit_core_dumps - record information about processes that end abnormally 2628 * audit_core_dumps - record information about processes that end abnormally
2434 * @signr: signal value 2629 * @signr: signal value
2435 * 2630 *
@@ -2440,7 +2635,8 @@ void audit_core_dumps(long signr)
2440{ 2635{
2441 struct audit_buffer *ab; 2636 struct audit_buffer *ab;
2442 u32 sid; 2637 u32 sid;
2443 uid_t auid = audit_get_loginuid(current); 2638 uid_t auid = audit_get_loginuid(current), uid;
2639 gid_t gid;
2444 unsigned int sessionid = audit_get_sessionid(current); 2640 unsigned int sessionid = audit_get_sessionid(current);
2445 2641
2446 if (!audit_enabled) 2642 if (!audit_enabled)
@@ -2450,8 +2646,9 @@ void audit_core_dumps(long signr)
2450 return; 2646 return;
2451 2647
2452 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND); 2648 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
2649 current_uid_gid(&uid, &gid);
2453 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u", 2650 audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
2454 auid, current->uid, current->gid, sessionid); 2651 auid, uid, gid, sessionid);
2455 security_task_getsecid(current, &sid); 2652 security_task_getsecid(current, &sid);
2456 if (sid) { 2653 if (sid) {
2457 char *ctx = NULL; 2654 char *ctx = NULL;
diff --git a/kernel/capability.c b/kernel/capability.c
index 33e51e78c2d8..36b4b4daebec 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -7,6 +7,7 @@
7 * 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net> 7 * 30 May 2002: Cleanup, Robert M. Love <rml@tech9.net>
8 */ 8 */
9 9
10#include <linux/audit.h>
10#include <linux/capability.h> 11#include <linux/capability.h>
11#include <linux/mm.h> 12#include <linux/mm.h>
12#include <linux/module.h> 13#include <linux/module.h>
@@ -14,12 +15,7 @@
14#include <linux/syscalls.h> 15#include <linux/syscalls.h>
15#include <linux/pid_namespace.h> 16#include <linux/pid_namespace.h>
16#include <asm/uaccess.h> 17#include <asm/uaccess.h>
17 18#include "cred-internals.h"
18/*
19 * This lock protects task->cap_* for all tasks including current.
20 * Locking rule: acquire this prior to tasklist_lock.
21 */
22static DEFINE_SPINLOCK(task_capability_lock);
23 19
24/* 20/*
25 * Leveraged for setting/resetting capabilities 21 * Leveraged for setting/resetting capabilities
@@ -33,6 +29,17 @@ EXPORT_SYMBOL(__cap_empty_set);
33EXPORT_SYMBOL(__cap_full_set); 29EXPORT_SYMBOL(__cap_full_set);
34EXPORT_SYMBOL(__cap_init_eff_set); 30EXPORT_SYMBOL(__cap_init_eff_set);
35 31
32#ifdef CONFIG_SECURITY_FILE_CAPABILITIES
33int file_caps_enabled = 1;
34
35static int __init file_caps_disable(char *str)
36{
37 file_caps_enabled = 0;
38 return 1;
39}
40__setup("no_file_caps", file_caps_disable);
41#endif
42
36/* 43/*
37 * More recent versions of libcap are available from: 44 * More recent versions of libcap are available from:
38 * 45 *
@@ -115,167 +122,12 @@ static int cap_validate_magic(cap_user_header_t header, unsigned *tocopy)
115 return 0; 122 return 0;
116} 123}
117 124
118#ifndef CONFIG_SECURITY_FILE_CAPABILITIES
119
120/*
121 * Without filesystem capability support, we nominally support one process
122 * setting the capabilities of another
123 */
124static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
125 kernel_cap_t *pIp, kernel_cap_t *pPp)
126{
127 struct task_struct *target;
128 int ret;
129
130 spin_lock(&task_capability_lock);
131 read_lock(&tasklist_lock);
132
133 if (pid && pid != task_pid_vnr(current)) {
134 target = find_task_by_vpid(pid);
135 if (!target) {
136 ret = -ESRCH;
137 goto out;
138 }
139 } else
140 target = current;
141
142 ret = security_capget(target, pEp, pIp, pPp);
143
144out:
145 read_unlock(&tasklist_lock);
146 spin_unlock(&task_capability_lock);
147
148 return ret;
149}
150
151/*
152 * cap_set_pg - set capabilities for all processes in a given process
153 * group. We call this holding task_capability_lock and tasklist_lock.
154 */
155static inline int cap_set_pg(int pgrp_nr, kernel_cap_t *effective,
156 kernel_cap_t *inheritable,
157 kernel_cap_t *permitted)
158{
159 struct task_struct *g, *target;
160 int ret = -EPERM;
161 int found = 0;
162 struct pid *pgrp;
163
164 spin_lock(&task_capability_lock);
165 read_lock(&tasklist_lock);
166
167 pgrp = find_vpid(pgrp_nr);
168 do_each_pid_task(pgrp, PIDTYPE_PGID, g) {
169 target = g;
170 while_each_thread(g, target) {
171 if (!security_capset_check(target, effective,
172 inheritable, permitted)) {
173 security_capset_set(target, effective,
174 inheritable, permitted);
175 ret = 0;
176 }
177 found = 1;
178 }
179 } while_each_pid_task(pgrp, PIDTYPE_PGID, g);
180
181 read_unlock(&tasklist_lock);
182 spin_unlock(&task_capability_lock);
183
184 if (!found)
185 ret = 0;
186 return ret;
187}
188
189/*
190 * cap_set_all - set capabilities for all processes other than init
191 * and self. We call this holding task_capability_lock and tasklist_lock.
192 */
193static inline int cap_set_all(kernel_cap_t *effective,
194 kernel_cap_t *inheritable,
195 kernel_cap_t *permitted)
196{
197 struct task_struct *g, *target;
198 int ret = -EPERM;
199 int found = 0;
200
201 spin_lock(&task_capability_lock);
202 read_lock(&tasklist_lock);
203
204 do_each_thread(g, target) {
205 if (target == current
206 || is_container_init(target->group_leader))
207 continue;
208 found = 1;
209 if (security_capset_check(target, effective, inheritable,
210 permitted))
211 continue;
212 ret = 0;
213 security_capset_set(target, effective, inheritable, permitted);
214 } while_each_thread(g, target);
215
216 read_unlock(&tasklist_lock);
217 spin_unlock(&task_capability_lock);
218
219 if (!found)
220 ret = 0;
221
222 return ret;
223}
224
225/*
226 * Given the target pid does not refer to the current process we
227 * need more elaborate support... (This support is not present when
228 * filesystem capabilities are configured.)
229 */
230static inline int do_sys_capset_other_tasks(pid_t pid, kernel_cap_t *effective,
231 kernel_cap_t *inheritable,
232 kernel_cap_t *permitted)
233{
234 struct task_struct *target;
235 int ret;
236
237 if (!capable(CAP_SETPCAP))
238 return -EPERM;
239
240 if (pid == -1) /* all procs other than current and init */
241 return cap_set_all(effective, inheritable, permitted);
242
243 else if (pid < 0) /* all procs in process group */
244 return cap_set_pg(-pid, effective, inheritable, permitted);
245
246 /* target != current */
247 spin_lock(&task_capability_lock);
248 read_lock(&tasklist_lock);
249
250 target = find_task_by_vpid(pid);
251 if (!target)
252 ret = -ESRCH;
253 else {
254 ret = security_capset_check(target, effective, inheritable,
255 permitted);
256
257 /* having verified that the proposed changes are legal,
258 we now put them into effect. */
259 if (!ret)
260 security_capset_set(target, effective, inheritable,
261 permitted);
262 }
263
264 read_unlock(&tasklist_lock);
265 spin_unlock(&task_capability_lock);
266
267 return ret;
268}
269
270#else /* ie., def CONFIG_SECURITY_FILE_CAPABILITIES */
271
272/* 125/*
273 * If we have configured with filesystem capability support, then the 126 * The only thing that can change the capabilities of the current
274 * only thing that can change the capabilities of the current process 127 * process is the current process. As such, we can't be in this code
275 * is the current process. As such, we can't be in this code at the 128 * at the same time as we are in the process of setting capabilities
276 * same time as we are in the process of setting capabilities in this 129 * in this process. The net result is that we can limit our use of
277 * process. The net result is that we can limit our use of locks to 130 * locks to when we are reading the caps of another process.
278 * when we are reading the caps of another process.
279 */ 131 */
280static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp, 132static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
281 kernel_cap_t *pIp, kernel_cap_t *pPp) 133 kernel_cap_t *pIp, kernel_cap_t *pPp)
@@ -285,7 +137,6 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
285 if (pid && (pid != task_pid_vnr(current))) { 137 if (pid && (pid != task_pid_vnr(current))) {
286 struct task_struct *target; 138 struct task_struct *target;
287 139
288 spin_lock(&task_capability_lock);
289 read_lock(&tasklist_lock); 140 read_lock(&tasklist_lock);
290 141
291 target = find_task_by_vpid(pid); 142 target = find_task_by_vpid(pid);
@@ -295,50 +146,12 @@ static inline int cap_get_target_pid(pid_t pid, kernel_cap_t *pEp,
295 ret = security_capget(target, pEp, pIp, pPp); 146 ret = security_capget(target, pEp, pIp, pPp);
296 147
297 read_unlock(&tasklist_lock); 148 read_unlock(&tasklist_lock);
298 spin_unlock(&task_capability_lock);
299 } else 149 } else
300 ret = security_capget(current, pEp, pIp, pPp); 150 ret = security_capget(current, pEp, pIp, pPp);
301 151
302 return ret; 152 return ret;
303} 153}
304 154
305/*
306 * With filesystem capability support configured, the kernel does not
307 * permit the changing of capabilities in one process by another
308 * process. (CAP_SETPCAP has much less broad semantics when configured
309 * this way.)
310 */
311static inline int do_sys_capset_other_tasks(pid_t pid,
312 kernel_cap_t *effective,
313 kernel_cap_t *inheritable,
314 kernel_cap_t *permitted)
315{
316 return -EPERM;
317}
318
319#endif /* ie., ndef CONFIG_SECURITY_FILE_CAPABILITIES */
320
321/*
322 * Atomically modify the effective capabilities returning the original
323 * value. No permission check is performed here - it is assumed that the
324 * caller is permitted to set the desired effective capabilities.
325 */
326kernel_cap_t cap_set_effective(const kernel_cap_t pE_new)
327{
328 kernel_cap_t pE_old;
329
330 spin_lock(&task_capability_lock);
331
332 pE_old = current->cap_effective;
333 current->cap_effective = pE_new;
334
335 spin_unlock(&task_capability_lock);
336
337 return pE_old;
338}
339
340EXPORT_SYMBOL(cap_set_effective);
341
342/** 155/**
343 * sys_capget - get the capabilities of a given process. 156 * sys_capget - get the capabilities of a given process.
344 * @header: pointer to struct that contains capability version and 157 * @header: pointer to struct that contains capability version and
@@ -366,7 +179,6 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
366 return -EINVAL; 179 return -EINVAL;
367 180
368 ret = cap_get_target_pid(pid, &pE, &pI, &pP); 181 ret = cap_get_target_pid(pid, &pE, &pI, &pP);
369
370 if (!ret) { 182 if (!ret) {
371 struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S]; 183 struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
372 unsigned i; 184 unsigned i;
@@ -412,16 +224,14 @@ asmlinkage long sys_capget(cap_user_header_t header, cap_user_data_t dataptr)
412 * @data: pointer to struct that contains the effective, permitted, 224 * @data: pointer to struct that contains the effective, permitted,
413 * and inheritable capabilities 225 * and inheritable capabilities
414 * 226 *
415 * Set capabilities for a given process, all processes, or all 227 * Set capabilities for the current process only. The ability to any other
416 * processes in a given process group. 228 * process(es) has been deprecated and removed.
417 * 229 *
418 * The restrictions on setting capabilities are specified as: 230 * The restrictions on setting capabilities are specified as:
419 * 231 *
420 * [pid is for the 'target' task. 'current' is the calling task.] 232 * I: any raised capabilities must be a subset of the old permitted
421 * 233 * P: any raised capabilities must be a subset of the old permitted
422 * I: any raised capabilities must be a subset of the (old current) permitted 234 * E: must be set to a subset of new permitted
423 * P: any raised capabilities must be a subset of the (old current) permitted
424 * E: must be set to a subset of (new target) permitted
425 * 235 *
426 * Returns 0 on success and < 0 on error. 236 * Returns 0 on success and < 0 on error.
427 */ 237 */
@@ -430,6 +240,7 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
430 struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S]; 240 struct __user_cap_data_struct kdata[_KERNEL_CAPABILITY_U32S];
431 unsigned i, tocopy; 241 unsigned i, tocopy;
432 kernel_cap_t inheritable, permitted, effective; 242 kernel_cap_t inheritable, permitted, effective;
243 struct cred *new;
433 int ret; 244 int ret;
434 pid_t pid; 245 pid_t pid;
435 246
@@ -440,10 +251,13 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
440 if (get_user(pid, &header->pid)) 251 if (get_user(pid, &header->pid))
441 return -EFAULT; 252 return -EFAULT;
442 253
443 if (copy_from_user(&kdata, data, tocopy 254 /* may only affect current now */
444 * sizeof(struct __user_cap_data_struct))) { 255 if (pid != 0 && pid != task_pid_vnr(current))
256 return -EPERM;
257
258 if (copy_from_user(&kdata, data,
259 tocopy * sizeof(struct __user_cap_data_struct)))
445 return -EFAULT; 260 return -EFAULT;
446 }
447 261
448 for (i = 0; i < tocopy; i++) { 262 for (i = 0; i < tocopy; i++) {
449 effective.cap[i] = kdata[i].effective; 263 effective.cap[i] = kdata[i].effective;
@@ -457,32 +271,23 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
457 i++; 271 i++;
458 } 272 }
459 273
460 if (pid && (pid != task_pid_vnr(current))) 274 new = prepare_creds();
461 ret = do_sys_capset_other_tasks(pid, &effective, &inheritable, 275 if (!new)
462 &permitted); 276 return -ENOMEM;
463 else {
464 /*
465 * This lock is required even when filesystem
466 * capability support is configured - it protects the
467 * sys_capget() call from returning incorrect data in
468 * the case that the targeted process is not the
469 * current one.
470 */
471 spin_lock(&task_capability_lock);
472 277
473 ret = security_capset_check(current, &effective, &inheritable, 278 ret = security_capset(new, current_cred(),
474 &permitted); 279 &effective, &inheritable, &permitted);
475 /* 280 if (ret < 0)
476 * Having verified that the proposed changes are 281 goto error;
477 * legal, we now put them into effect. 282
478 */ 283 ret = audit_log_capset(pid, new, current_cred());
479 if (!ret) 284 if (ret < 0)
480 security_capset_set(current, &effective, &inheritable, 285 return ret;
481 &permitted);
482 spin_unlock(&task_capability_lock);
483 }
484 286
287 return commit_creds(new);
485 288
289error:
290 abort_creds(new);
486 return ret; 291 return ret;
487} 292}
488 293
@@ -498,6 +303,11 @@ asmlinkage long sys_capset(cap_user_header_t header, const cap_user_data_t data)
498 */ 303 */
499int capable(int cap) 304int capable(int cap)
500{ 305{
306 if (unlikely(!cap_valid(cap))) {
307 printk(KERN_CRIT "capable() called with invalid cap=%u\n", cap);
308 BUG();
309 }
310
501 if (has_capability(current, cap)) { 311 if (has_capability(current, cap)) {
502 current->flags |= PF_SUPERPRIV; 312 current->flags |= PF_SUPERPRIV;
503 return 1; 313 return 1;
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 358e77564e6f..8fe8c0cb137b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -571,8 +571,8 @@ static struct inode *cgroup_new_inode(mode_t mode, struct super_block *sb)
571 571
572 if (inode) { 572 if (inode) {
573 inode->i_mode = mode; 573 inode->i_mode = mode;
574 inode->i_uid = current->fsuid; 574 inode->i_uid = current_fsuid();
575 inode->i_gid = current->fsgid; 575 inode->i_gid = current_fsgid();
576 inode->i_blocks = 0; 576 inode->i_blocks = 0;
577 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 577 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
578 inode->i_mapping->backing_dev_info = &cgroup_backing_dev_info; 578 inode->i_mapping->backing_dev_info = &cgroup_backing_dev_info;
@@ -1279,6 +1279,7 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
1279static int attach_task_by_pid(struct cgroup *cgrp, u64 pid) 1279static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
1280{ 1280{
1281 struct task_struct *tsk; 1281 struct task_struct *tsk;
1282 const struct cred *cred = current_cred(), *tcred;
1282 int ret; 1283 int ret;
1283 1284
1284 if (pid) { 1285 if (pid) {
@@ -1288,14 +1289,16 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid)
1288 rcu_read_unlock(); 1289 rcu_read_unlock();
1289 return -ESRCH; 1290 return -ESRCH;
1290 } 1291 }
1291 get_task_struct(tsk);
1292 rcu_read_unlock();
1293 1292
1294 if ((current->euid) && (current->euid != tsk->uid) 1293 tcred = __task_cred(tsk);
1295 && (current->euid != tsk->suid)) { 1294 if (cred->euid &&
1296 put_task_struct(tsk); 1295 cred->euid != tcred->uid &&
1296 cred->euid != tcred->suid) {
1297 rcu_read_unlock();
1297 return -EACCES; 1298 return -EACCES;
1298 } 1299 }
1300 get_task_struct(tsk);
1301 rcu_read_unlock();
1299 } else { 1302 } else {
1300 tsk = current; 1303 tsk = current;
1301 get_task_struct(tsk); 1304 get_task_struct(tsk);
diff --git a/kernel/cred-internals.h b/kernel/cred-internals.h
new file mode 100644
index 000000000000..2dc4fc2d0bf1
--- /dev/null
+++ b/kernel/cred-internals.h
@@ -0,0 +1,21 @@
1/* Internal credentials stuff
2 *
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11
12/*
13 * user.c
14 */
15static inline void sched_switch_user(struct task_struct *p)
16{
17#ifdef CONFIG_USER_SCHED
18 sched_move_task(p);
19#endif /* CONFIG_USER_SCHED */
20}
21
diff --git a/kernel/cred.c b/kernel/cred.c
new file mode 100644
index 000000000000..13697ca2bb38
--- /dev/null
+++ b/kernel/cred.c
@@ -0,0 +1,577 @@
1/* Task credentials management - see Documentation/credentials.txt
2 *
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#include <linux/module.h>
12#include <linux/cred.h>
13#include <linux/sched.h>
14#include <linux/key.h>
15#include <linux/keyctl.h>
16#include <linux/init_task.h>
17#include <linux/security.h>
18#include <linux/cn_proc.h>
19#include "cred-internals.h"
20
21static struct kmem_cache *cred_jar;
22
23/*
24 * The common credentials for the initial task's thread group
25 */
26#ifdef CONFIG_KEYS
27static struct thread_group_cred init_tgcred = {
28 .usage = ATOMIC_INIT(2),
29 .tgid = 0,
30 .lock = SPIN_LOCK_UNLOCKED,
31};
32#endif
33
34/*
35 * The initial credentials for the initial task
36 */
37struct cred init_cred = {
38 .usage = ATOMIC_INIT(4),
39 .securebits = SECUREBITS_DEFAULT,
40 .cap_inheritable = CAP_INIT_INH_SET,
41 .cap_permitted = CAP_FULL_SET,
42 .cap_effective = CAP_INIT_EFF_SET,
43 .cap_bset = CAP_INIT_BSET,
44 .user = INIT_USER,
45 .group_info = &init_groups,
46#ifdef CONFIG_KEYS
47 .tgcred = &init_tgcred,
48#endif
49};
50
51/*
52 * Dispose of the shared task group credentials
53 */
54#ifdef CONFIG_KEYS
55static void release_tgcred_rcu(struct rcu_head *rcu)
56{
57 struct thread_group_cred *tgcred =
58 container_of(rcu, struct thread_group_cred, rcu);
59
60 BUG_ON(atomic_read(&tgcred->usage) != 0);
61
62 key_put(tgcred->session_keyring);
63 key_put(tgcred->process_keyring);
64 kfree(tgcred);
65}
66#endif
67
68/*
69 * Release a set of thread group credentials.
70 */
71static void release_tgcred(struct cred *cred)
72{
73#ifdef CONFIG_KEYS
74 struct thread_group_cred *tgcred = cred->tgcred;
75
76 if (atomic_dec_and_test(&tgcred->usage))
77 call_rcu(&tgcred->rcu, release_tgcred_rcu);
78#endif
79}
80
81/*
82 * The RCU callback to actually dispose of a set of credentials
83 */
84static void put_cred_rcu(struct rcu_head *rcu)
85{
86 struct cred *cred = container_of(rcu, struct cred, rcu);
87
88 if (atomic_read(&cred->usage) != 0)
89 panic("CRED: put_cred_rcu() sees %p with usage %d\n",
90 cred, atomic_read(&cred->usage));
91
92 security_cred_free(cred);
93 key_put(cred->thread_keyring);
94 key_put(cred->request_key_auth);
95 release_tgcred(cred);
96 put_group_info(cred->group_info);
97 free_uid(cred->user);
98 kmem_cache_free(cred_jar, cred);
99}
100
101/**
102 * __put_cred - Destroy a set of credentials
103 * @cred: The record to release
104 *
105 * Destroy a set of credentials on which no references remain.
106 */
107void __put_cred(struct cred *cred)
108{
109 BUG_ON(atomic_read(&cred->usage) != 0);
110
111 call_rcu(&cred->rcu, put_cred_rcu);
112}
113EXPORT_SYMBOL(__put_cred);
114
115/**
116 * prepare_creds - Prepare a new set of credentials for modification
117 *
118 * Prepare a new set of task credentials for modification. A task's creds
119 * shouldn't generally be modified directly, therefore this function is used to
120 * prepare a new copy, which the caller then modifies and then commits by
121 * calling commit_creds().
122 *
123 * Preparation involves making a copy of the objective creds for modification.
124 *
125 * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
126 *
127 * Call commit_creds() or abort_creds() to clean up.
128 */
129struct cred *prepare_creds(void)
130{
131 struct task_struct *task = current;
132 const struct cred *old;
133 struct cred *new;
134
135 BUG_ON(atomic_read(&task->real_cred->usage) < 1);
136
137 new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
138 if (!new)
139 return NULL;
140
141 old = task->cred;
142 memcpy(new, old, sizeof(struct cred));
143
144 atomic_set(&new->usage, 1);
145 get_group_info(new->group_info);
146 get_uid(new->user);
147
148#ifdef CONFIG_KEYS
149 key_get(new->thread_keyring);
150 key_get(new->request_key_auth);
151 atomic_inc(&new->tgcred->usage);
152#endif
153
154#ifdef CONFIG_SECURITY
155 new->security = NULL;
156#endif
157
158 if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
159 goto error;
160 return new;
161
162error:
163 abort_creds(new);
164 return NULL;
165}
166EXPORT_SYMBOL(prepare_creds);
167
168/*
169 * Prepare credentials for current to perform an execve()
170 * - The caller must hold current->cred_exec_mutex
171 */
172struct cred *prepare_exec_creds(void)
173{
174 struct thread_group_cred *tgcred = NULL;
175 struct cred *new;
176
177#ifdef CONFIG_KEYS
178 tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
179 if (!tgcred)
180 return NULL;
181#endif
182
183 new = prepare_creds();
184 if (!new) {
185 kfree(tgcred);
186 return new;
187 }
188
189#ifdef CONFIG_KEYS
190 /* newly exec'd tasks don't get a thread keyring */
191 key_put(new->thread_keyring);
192 new->thread_keyring = NULL;
193
194 /* create a new per-thread-group creds for all this set of threads to
195 * share */
196 memcpy(tgcred, new->tgcred, sizeof(struct thread_group_cred));
197
198 atomic_set(&tgcred->usage, 1);
199 spin_lock_init(&tgcred->lock);
200
201 /* inherit the session keyring; new process keyring */
202 key_get(tgcred->session_keyring);
203 tgcred->process_keyring = NULL;
204
205 release_tgcred(new);
206 new->tgcred = tgcred;
207#endif
208
209 return new;
210}
211
212/*
213 * prepare new credentials for the usermode helper dispatcher
214 */
215struct cred *prepare_usermodehelper_creds(void)
216{
217#ifdef CONFIG_KEYS
218 struct thread_group_cred *tgcred = NULL;
219#endif
220 struct cred *new;
221
222#ifdef CONFIG_KEYS
223 tgcred = kzalloc(sizeof(*new->tgcred), GFP_ATOMIC);
224 if (!tgcred)
225 return NULL;
226#endif
227
228 new = kmem_cache_alloc(cred_jar, GFP_ATOMIC);
229 if (!new)
230 return NULL;
231
232 memcpy(new, &init_cred, sizeof(struct cred));
233
234 atomic_set(&new->usage, 1);
235 get_group_info(new->group_info);
236 get_uid(new->user);
237
238#ifdef CONFIG_KEYS
239 new->thread_keyring = NULL;
240 new->request_key_auth = NULL;
241 new->jit_keyring = KEY_REQKEY_DEFL_DEFAULT;
242
243 atomic_set(&tgcred->usage, 1);
244 spin_lock_init(&tgcred->lock);
245 new->tgcred = tgcred;
246#endif
247
248#ifdef CONFIG_SECURITY
249 new->security = NULL;
250#endif
251 if (security_prepare_creds(new, &init_cred, GFP_ATOMIC) < 0)
252 goto error;
253
254 BUG_ON(atomic_read(&new->usage) != 1);
255 return new;
256
257error:
258 put_cred(new);
259 return NULL;
260}
261
262/*
263 * Copy credentials for the new process created by fork()
264 *
265 * We share if we can, but under some circumstances we have to generate a new
266 * set.
267 *
268 * The new process gets the current process's subjective credentials as its
269 * objective and subjective credentials
270 */
271int copy_creds(struct task_struct *p, unsigned long clone_flags)
272{
273#ifdef CONFIG_KEYS
274 struct thread_group_cred *tgcred;
275#endif
276 struct cred *new;
277
278 mutex_init(&p->cred_exec_mutex);
279
280 if (
281#ifdef CONFIG_KEYS
282 !p->cred->thread_keyring &&
283#endif
284 clone_flags & CLONE_THREAD
285 ) {
286 p->real_cred = get_cred(p->cred);
287 get_cred(p->cred);
288 atomic_inc(&p->cred->user->processes);
289 return 0;
290 }
291
292 new = prepare_creds();
293 if (!new)
294 return -ENOMEM;
295
296#ifdef CONFIG_KEYS
297 /* new threads get their own thread keyrings if their parent already
298 * had one */
299 if (new->thread_keyring) {
300 key_put(new->thread_keyring);
301 new->thread_keyring = NULL;
302 if (clone_flags & CLONE_THREAD)
303 install_thread_keyring_to_cred(new);
304 }
305
306 /* we share the process and session keyrings between all the threads in
307 * a process - this is slightly icky as we violate COW credentials a
308 * bit */
309 if (!(clone_flags & CLONE_THREAD)) {
310 tgcred = kmalloc(sizeof(*tgcred), GFP_KERNEL);
311 if (!tgcred) {
312 put_cred(new);
313 return -ENOMEM;
314 }
315 atomic_set(&tgcred->usage, 1);
316 spin_lock_init(&tgcred->lock);
317 tgcred->process_keyring = NULL;
318 tgcred->session_keyring = key_get(new->tgcred->session_keyring);
319
320 release_tgcred(new);
321 new->tgcred = tgcred;
322 }
323#endif
324
325 atomic_inc(&new->user->processes);
326 p->cred = p->real_cred = get_cred(new);
327 return 0;
328}
329
330/**
331 * commit_creds - Install new credentials upon the current task
332 * @new: The credentials to be assigned
333 *
334 * Install a new set of credentials to the current task, using RCU to replace
335 * the old set. Both the objective and the subjective credentials pointers are
336 * updated. This function may not be called if the subjective credentials are
337 * in an overridden state.
338 *
339 * This function eats the caller's reference to the new credentials.
340 *
341 * Always returns 0 thus allowing this function to be tail-called at the end
342 * of, say, sys_setgid().
343 */
344int commit_creds(struct cred *new)
345{
346 struct task_struct *task = current;
347 const struct cred *old;
348
349 BUG_ON(task->cred != task->real_cred);
350 BUG_ON(atomic_read(&task->real_cred->usage) < 2);
351 BUG_ON(atomic_read(&new->usage) < 1);
352
353 old = task->real_cred;
354 security_commit_creds(new, old);
355
356 get_cred(new); /* we will require a ref for the subj creds too */
357
358 /* dumpability changes */
359 if (old->euid != new->euid ||
360 old->egid != new->egid ||
361 old->fsuid != new->fsuid ||
362 old->fsgid != new->fsgid ||
363 !cap_issubset(new->cap_permitted, old->cap_permitted)) {
364 set_dumpable(task->mm, suid_dumpable);
365 task->pdeath_signal = 0;
366 smp_wmb();
367 }
368
369 /* alter the thread keyring */
370 if (new->fsuid != old->fsuid)
371 key_fsuid_changed(task);
372 if (new->fsgid != old->fsgid)
373 key_fsgid_changed(task);
374
375 /* do it
376 * - What if a process setreuid()'s and this brings the
377 * new uid over his NPROC rlimit? We can check this now
378 * cheaply with the new uid cache, so if it matters
379 * we should be checking for it. -DaveM
380 */
381 if (new->user != old->user)
382 atomic_inc(&new->user->processes);
383 rcu_assign_pointer(task->real_cred, new);
384 rcu_assign_pointer(task->cred, new);
385 if (new->user != old->user)
386 atomic_dec(&old->user->processes);
387
388 sched_switch_user(task);
389
390 /* send notifications */
391 if (new->uid != old->uid ||
392 new->euid != old->euid ||
393 new->suid != old->suid ||
394 new->fsuid != old->fsuid)
395 proc_id_connector(task, PROC_EVENT_UID);
396
397 if (new->gid != old->gid ||
398 new->egid != old->egid ||
399 new->sgid != old->sgid ||
400 new->fsgid != old->fsgid)
401 proc_id_connector(task, PROC_EVENT_GID);
402
403 /* release the old obj and subj refs both */
404 put_cred(old);
405 put_cred(old);
406 return 0;
407}
408EXPORT_SYMBOL(commit_creds);
409
410/**
411 * abort_creds - Discard a set of credentials and unlock the current task
412 * @new: The credentials that were going to be applied
413 *
414 * Discard a set of credentials that were under construction and unlock the
415 * current task.
416 */
417void abort_creds(struct cred *new)
418{
419 BUG_ON(atomic_read(&new->usage) < 1);
420 put_cred(new);
421}
422EXPORT_SYMBOL(abort_creds);
423
424/**
425 * override_creds - Override the current process's subjective credentials
426 * @new: The credentials to be assigned
427 *
428 * Install a set of temporary override subjective credentials on the current
429 * process, returning the old set for later reversion.
430 */
431const struct cred *override_creds(const struct cred *new)
432{
433 const struct cred *old = current->cred;
434
435 rcu_assign_pointer(current->cred, get_cred(new));
436 return old;
437}
438EXPORT_SYMBOL(override_creds);
439
440/**
441 * revert_creds - Revert a temporary subjective credentials override
442 * @old: The credentials to be restored
443 *
444 * Revert a temporary set of override subjective credentials to an old set,
445 * discarding the override set.
446 */
447void revert_creds(const struct cred *old)
448{
449 const struct cred *override = current->cred;
450
451 rcu_assign_pointer(current->cred, old);
452 put_cred(override);
453}
454EXPORT_SYMBOL(revert_creds);
455
456/*
457 * initialise the credentials stuff
458 */
459void __init cred_init(void)
460{
461 /* allocate a slab in which we can store credentials */
462 cred_jar = kmem_cache_create("cred_jar", sizeof(struct cred),
463 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
464}
465
466/**
467 * prepare_kernel_cred - Prepare a set of credentials for a kernel service
468 * @daemon: A userspace daemon to be used as a reference
469 *
470 * Prepare a set of credentials for a kernel service. This can then be used to
471 * override a task's own credentials so that work can be done on behalf of that
472 * task that requires a different subjective context.
473 *
474 * @daemon is used to provide a base for the security record, but can be NULL.
475 * If @daemon is supplied, then the security data will be derived from that;
476 * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
477 *
478 * The caller may change these controls afterwards if desired.
479 *
480 * Returns the new credentials or NULL if out of memory.
481 *
482 * Does not take, and does not return holding current->cred_replace_mutex.
483 */
484struct cred *prepare_kernel_cred(struct task_struct *daemon)
485{
486 const struct cred *old;
487 struct cred *new;
488
489 new = kmem_cache_alloc(cred_jar, GFP_KERNEL);
490 if (!new)
491 return NULL;
492
493 if (daemon)
494 old = get_task_cred(daemon);
495 else
496 old = get_cred(&init_cred);
497
498 get_uid(new->user);
499 get_group_info(new->group_info);
500
501#ifdef CONFIG_KEYS
502 atomic_inc(&init_tgcred.usage);
503 new->tgcred = &init_tgcred;
504 new->request_key_auth = NULL;
505 new->thread_keyring = NULL;
506 new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
507#endif
508
509#ifdef CONFIG_SECURITY
510 new->security = NULL;
511#endif
512 if (security_prepare_creds(new, old, GFP_KERNEL) < 0)
513 goto error;
514
515 atomic_set(&new->usage, 1);
516 put_cred(old);
517 return new;
518
519error:
520 put_cred(new);
521 return NULL;
522}
523EXPORT_SYMBOL(prepare_kernel_cred);
524
525/**
526 * set_security_override - Set the security ID in a set of credentials
527 * @new: The credentials to alter
528 * @secid: The LSM security ID to set
529 *
530 * Set the LSM security ID in a set of credentials so that the subjective
531 * security is overridden when an alternative set of credentials is used.
532 */
533int set_security_override(struct cred *new, u32 secid)
534{
535 return security_kernel_act_as(new, secid);
536}
537EXPORT_SYMBOL(set_security_override);
538
539/**
540 * set_security_override_from_ctx - Set the security ID in a set of credentials
541 * @new: The credentials to alter
542 * @secctx: The LSM security context to generate the security ID from.
543 *
544 * Set the LSM security ID in a set of credentials so that the subjective
545 * security is overridden when an alternative set of credentials is used. The
546 * security ID is specified in string form as a security context to be
547 * interpreted by the LSM.
548 */
549int set_security_override_from_ctx(struct cred *new, const char *secctx)
550{
551 u32 secid;
552 int ret;
553
554 ret = security_secctx_to_secid(secctx, strlen(secctx), &secid);
555 if (ret < 0)
556 return ret;
557
558 return set_security_override(new, secid);
559}
560EXPORT_SYMBOL(set_security_override_from_ctx);
561
562/**
563 * set_create_files_as - Set the LSM file create context in a set of credentials
564 * @new: The credentials to alter
565 * @inode: The inode to take the context from
566 *
567 * Change the LSM file creation context in a set of credentials to be the same
568 * as the object context of the specified inode, so that the new inodes have
569 * the same MAC context as that inode.
570 */
571int set_create_files_as(struct cred *new, struct inode *inode)
572{
573 new->fsuid = inode->i_uid;
574 new->fsgid = inode->i_gid;
575 return security_kernel_create_files_as(new, inode);
576}
577EXPORT_SYMBOL(set_create_files_as);
diff --git a/kernel/exit.c b/kernel/exit.c
index ae2b92be5fae..16eda9b39f8d 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -47,12 +47,14 @@
47#include <linux/blkdev.h> 47#include <linux/blkdev.h>
48#include <linux/task_io_accounting_ops.h> 48#include <linux/task_io_accounting_ops.h>
49#include <linux/tracehook.h> 49#include <linux/tracehook.h>
50#include <linux/init_task.h>
50#include <trace/sched.h> 51#include <trace/sched.h>
51 52
52#include <asm/uaccess.h> 53#include <asm/uaccess.h>
53#include <asm/unistd.h> 54#include <asm/unistd.h>
54#include <asm/pgtable.h> 55#include <asm/pgtable.h>
55#include <asm/mmu_context.h> 56#include <asm/mmu_context.h>
57#include "cred-internals.h"
56 58
57static void exit_mm(struct task_struct * tsk); 59static void exit_mm(struct task_struct * tsk);
58 60
@@ -165,7 +167,10 @@ void release_task(struct task_struct * p)
165 int zap_leader; 167 int zap_leader;
166repeat: 168repeat:
167 tracehook_prepare_release_task(p); 169 tracehook_prepare_release_task(p);
168 atomic_dec(&p->user->processes); 170 /* don't need to get the RCU readlock here - the process is dead and
171 * can't be modifying its own credentials */
172 atomic_dec(&__task_cred(p)->user->processes);
173
169 proc_flush_task(p); 174 proc_flush_task(p);
170 write_lock_irq(&tasklist_lock); 175 write_lock_irq(&tasklist_lock);
171 tracehook_finish_release_task(p); 176 tracehook_finish_release_task(p);
@@ -340,12 +345,12 @@ static void reparent_to_kthreadd(void)
340 /* cpus_allowed? */ 345 /* cpus_allowed? */
341 /* rt_priority? */ 346 /* rt_priority? */
342 /* signals? */ 347 /* signals? */
343 security_task_reparent_to_init(current);
344 memcpy(current->signal->rlim, init_task.signal->rlim, 348 memcpy(current->signal->rlim, init_task.signal->rlim,
345 sizeof(current->signal->rlim)); 349 sizeof(current->signal->rlim));
346 atomic_inc(&(INIT_USER->__count)); 350
351 atomic_inc(&init_cred.usage);
352 commit_creds(&init_cred);
347 write_unlock_irq(&tasklist_lock); 353 write_unlock_irq(&tasklist_lock);
348 switch_uid(INIT_USER);
349} 354}
350 355
351void __set_special_pids(struct pid *pid) 356void __set_special_pids(struct pid *pid)
@@ -1087,7 +1092,6 @@ NORET_TYPE void do_exit(long code)
1087 check_stack_usage(); 1092 check_stack_usage();
1088 exit_thread(); 1093 exit_thread();
1089 cgroup_exit(tsk, 1); 1094 cgroup_exit(tsk, 1);
1090 exit_keys(tsk);
1091 1095
1092 if (group_dead && tsk->signal->leader) 1096 if (group_dead && tsk->signal->leader)
1093 disassociate_ctty(1); 1097 disassociate_ctty(1);
@@ -1272,12 +1276,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
1272 unsigned long state; 1276 unsigned long state;
1273 int retval, status, traced; 1277 int retval, status, traced;
1274 pid_t pid = task_pid_vnr(p); 1278 pid_t pid = task_pid_vnr(p);
1279 uid_t uid = __task_cred(p)->uid;
1275 1280
1276 if (!likely(options & WEXITED)) 1281 if (!likely(options & WEXITED))
1277 return 0; 1282 return 0;
1278 1283
1279 if (unlikely(options & WNOWAIT)) { 1284 if (unlikely(options & WNOWAIT)) {
1280 uid_t uid = p->uid;
1281 int exit_code = p->exit_code; 1285 int exit_code = p->exit_code;
1282 int why, status; 1286 int why, status;
1283 1287
@@ -1398,7 +1402,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
1398 if (!retval && infop) 1402 if (!retval && infop)
1399 retval = put_user(pid, &infop->si_pid); 1403 retval = put_user(pid, &infop->si_pid);
1400 if (!retval && infop) 1404 if (!retval && infop)
1401 retval = put_user(p->uid, &infop->si_uid); 1405 retval = put_user(uid, &infop->si_uid);
1402 if (!retval) 1406 if (!retval)
1403 retval = pid; 1407 retval = pid;
1404 1408
@@ -1463,7 +1467,8 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
1463 if (!unlikely(options & WNOWAIT)) 1467 if (!unlikely(options & WNOWAIT))
1464 p->exit_code = 0; 1468 p->exit_code = 0;
1465 1469
1466 uid = p->uid; 1470 /* don't need the RCU readlock here as we're holding a spinlock */
1471 uid = __task_cred(p)->uid;
1467unlock_sig: 1472unlock_sig:
1468 spin_unlock_irq(&p->sighand->siglock); 1473 spin_unlock_irq(&p->sighand->siglock);
1469 if (!exit_code) 1474 if (!exit_code)
@@ -1537,10 +1542,10 @@ static int wait_task_continued(struct task_struct *p, int options,
1537 } 1542 }
1538 if (!unlikely(options & WNOWAIT)) 1543 if (!unlikely(options & WNOWAIT))
1539 p->signal->flags &= ~SIGNAL_STOP_CONTINUED; 1544 p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
1545 uid = __task_cred(p)->uid;
1540 spin_unlock_irq(&p->sighand->siglock); 1546 spin_unlock_irq(&p->sighand->siglock);
1541 1547
1542 pid = task_pid_vnr(p); 1548 pid = task_pid_vnr(p);
1543 uid = p->uid;
1544 get_task_struct(p); 1549 get_task_struct(p);
1545 read_unlock(&tasklist_lock); 1550 read_unlock(&tasklist_lock);
1546 1551
diff --git a/kernel/fork.c b/kernel/fork.c
index f6083561dfe0..af0d0f04585c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -146,9 +146,8 @@ void __put_task_struct(struct task_struct *tsk)
146 WARN_ON(atomic_read(&tsk->usage)); 146 WARN_ON(atomic_read(&tsk->usage));
147 WARN_ON(tsk == current); 147 WARN_ON(tsk == current);
148 148
149 security_task_free(tsk); 149 put_cred(tsk->real_cred);
150 free_uid(tsk->user); 150 put_cred(tsk->cred);
151 put_group_info(tsk->group_info);
152 delayacct_tsk_free(tsk); 151 delayacct_tsk_free(tsk);
153 152
154 if (!profile_handoff_task(tsk)) 153 if (!profile_handoff_task(tsk))
@@ -804,12 +803,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
804 if (!sig) 803 if (!sig)
805 return -ENOMEM; 804 return -ENOMEM;
806 805
807 ret = copy_thread_group_keys(tsk);
808 if (ret < 0) {
809 kmem_cache_free(signal_cachep, sig);
810 return ret;
811 }
812
813 atomic_set(&sig->count, 1); 806 atomic_set(&sig->count, 1);
814 atomic_set(&sig->live, 1); 807 atomic_set(&sig->live, 1);
815 init_waitqueue_head(&sig->wait_chldexit); 808 init_waitqueue_head(&sig->wait_chldexit);
@@ -854,7 +847,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
854void __cleanup_signal(struct signal_struct *sig) 847void __cleanup_signal(struct signal_struct *sig)
855{ 848{
856 thread_group_cputime_free(sig); 849 thread_group_cputime_free(sig);
857 exit_thread_group_keys(sig);
858 tty_kref_put(sig->tty); 850 tty_kref_put(sig->tty);
859 kmem_cache_free(signal_cachep, sig); 851 kmem_cache_free(signal_cachep, sig);
860} 852}
@@ -970,16 +962,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
970 DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled); 962 DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
971#endif 963#endif
972 retval = -EAGAIN; 964 retval = -EAGAIN;
973 if (atomic_read(&p->user->processes) >= 965 if (atomic_read(&p->real_cred->user->processes) >=
974 p->signal->rlim[RLIMIT_NPROC].rlim_cur) { 966 p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
975 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) && 967 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
976 p->user != current->nsproxy->user_ns->root_user) 968 p->real_cred->user != current->nsproxy->user_ns->root_user)
977 goto bad_fork_free; 969 goto bad_fork_free;
978 } 970 }
979 971
980 atomic_inc(&p->user->__count); 972 retval = copy_creds(p, clone_flags);
981 atomic_inc(&p->user->processes); 973 if (retval < 0)
982 get_group_info(p->group_info); 974 goto bad_fork_free;
983 975
984 /* 976 /*
985 * If multiple threads are within copy_process(), then this check 977 * If multiple threads are within copy_process(), then this check
@@ -1034,10 +1026,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
1034 do_posix_clock_monotonic_gettime(&p->start_time); 1026 do_posix_clock_monotonic_gettime(&p->start_time);
1035 p->real_start_time = p->start_time; 1027 p->real_start_time = p->start_time;
1036 monotonic_to_bootbased(&p->real_start_time); 1028 monotonic_to_bootbased(&p->real_start_time);
1037#ifdef CONFIG_SECURITY
1038 p->security = NULL;
1039#endif
1040 p->cap_bset = current->cap_bset;
1041 p->io_context = NULL; 1029 p->io_context = NULL;
1042 p->audit_context = NULL; 1030 p->audit_context = NULL;
1043 cgroup_fork(p); 1031 cgroup_fork(p);
@@ -1082,10 +1070,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
1082 /* Perform scheduler related setup. Assign this task to a CPU. */ 1070 /* Perform scheduler related setup. Assign this task to a CPU. */
1083 sched_fork(p, clone_flags); 1071 sched_fork(p, clone_flags);
1084 1072
1085 if ((retval = security_task_alloc(p)))
1086 goto bad_fork_cleanup_policy;
1087 if ((retval = audit_alloc(p))) 1073 if ((retval = audit_alloc(p)))
1088 goto bad_fork_cleanup_security; 1074 goto bad_fork_cleanup_policy;
1089 /* copy all the process information */ 1075 /* copy all the process information */
1090 if ((retval = copy_semundo(clone_flags, p))) 1076 if ((retval = copy_semundo(clone_flags, p)))
1091 goto bad_fork_cleanup_audit; 1077 goto bad_fork_cleanup_audit;
@@ -1099,10 +1085,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
1099 goto bad_fork_cleanup_sighand; 1085 goto bad_fork_cleanup_sighand;
1100 if ((retval = copy_mm(clone_flags, p))) 1086 if ((retval = copy_mm(clone_flags, p)))
1101 goto bad_fork_cleanup_signal; 1087 goto bad_fork_cleanup_signal;
1102 if ((retval = copy_keys(clone_flags, p)))
1103 goto bad_fork_cleanup_mm;
1104 if ((retval = copy_namespaces(clone_flags, p))) 1088 if ((retval = copy_namespaces(clone_flags, p)))
1105 goto bad_fork_cleanup_keys; 1089 goto bad_fork_cleanup_mm;
1106 if ((retval = copy_io(clone_flags, p))) 1090 if ((retval = copy_io(clone_flags, p)))
1107 goto bad_fork_cleanup_namespaces; 1091 goto bad_fork_cleanup_namespaces;
1108 retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs); 1092 retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
@@ -1267,8 +1251,6 @@ bad_fork_cleanup_io:
1267 put_io_context(p->io_context); 1251 put_io_context(p->io_context);
1268bad_fork_cleanup_namespaces: 1252bad_fork_cleanup_namespaces:
1269 exit_task_namespaces(p); 1253 exit_task_namespaces(p);
1270bad_fork_cleanup_keys:
1271 exit_keys(p);
1272bad_fork_cleanup_mm: 1254bad_fork_cleanup_mm:
1273 if (p->mm) 1255 if (p->mm)
1274 mmput(p->mm); 1256 mmput(p->mm);
@@ -1284,8 +1266,6 @@ bad_fork_cleanup_semundo:
1284 exit_sem(p); 1266 exit_sem(p);
1285bad_fork_cleanup_audit: 1267bad_fork_cleanup_audit:
1286 audit_free(p); 1268 audit_free(p);
1287bad_fork_cleanup_security:
1288 security_task_free(p);
1289bad_fork_cleanup_policy: 1269bad_fork_cleanup_policy:
1290#ifdef CONFIG_NUMA 1270#ifdef CONFIG_NUMA
1291 mpol_put(p->mempolicy); 1271 mpol_put(p->mempolicy);
@@ -1298,9 +1278,9 @@ bad_fork_cleanup_cgroup:
1298bad_fork_cleanup_put_domain: 1278bad_fork_cleanup_put_domain:
1299 module_put(task_thread_info(p)->exec_domain->module); 1279 module_put(task_thread_info(p)->exec_domain->module);
1300bad_fork_cleanup_count: 1280bad_fork_cleanup_count:
1301 put_group_info(p->group_info); 1281 atomic_dec(&p->cred->user->processes);
1302 atomic_dec(&p->user->processes); 1282 put_cred(p->real_cred);
1303 free_uid(p->user); 1283 put_cred(p->cred);
1304bad_fork_free: 1284bad_fork_free:
1305 free_task(p); 1285 free_task(p);
1306fork_out: 1286fork_out:
diff --git a/kernel/futex.c b/kernel/futex.c
index 8af10027514b..4fe790e89d0f 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -439,13 +439,20 @@ static void free_pi_state(struct futex_pi_state *pi_state)
439static struct task_struct * futex_find_get_task(pid_t pid) 439static struct task_struct * futex_find_get_task(pid_t pid)
440{ 440{
441 struct task_struct *p; 441 struct task_struct *p;
442 const struct cred *cred = current_cred(), *pcred;
442 443
443 rcu_read_lock(); 444 rcu_read_lock();
444 p = find_task_by_vpid(pid); 445 p = find_task_by_vpid(pid);
445 if (!p || ((current->euid != p->euid) && (current->euid != p->uid))) 446 if (!p) {
446 p = ERR_PTR(-ESRCH); 447 p = ERR_PTR(-ESRCH);
447 else 448 } else {
448 get_task_struct(p); 449 pcred = __task_cred(p);
450 if (cred->euid != pcred->euid &&
451 cred->euid != pcred->uid)
452 p = ERR_PTR(-ESRCH);
453 else
454 get_task_struct(p);
455 }
449 456
450 rcu_read_unlock(); 457 rcu_read_unlock();
451 458
@@ -1829,6 +1836,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
1829{ 1836{
1830 struct robust_list_head __user *head; 1837 struct robust_list_head __user *head;
1831 unsigned long ret; 1838 unsigned long ret;
1839 const struct cred *cred = current_cred(), *pcred;
1832 1840
1833 if (!futex_cmpxchg_enabled) 1841 if (!futex_cmpxchg_enabled)
1834 return -ENOSYS; 1842 return -ENOSYS;
@@ -1844,8 +1852,10 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
1844 if (!p) 1852 if (!p)
1845 goto err_unlock; 1853 goto err_unlock;
1846 ret = -EPERM; 1854 ret = -EPERM;
1847 if ((current->euid != p->euid) && (current->euid != p->uid) && 1855 pcred = __task_cred(p);
1848 !capable(CAP_SYS_PTRACE)) 1856 if (cred->euid != pcred->euid &&
1857 cred->euid != pcred->uid &&
1858 !capable(CAP_SYS_PTRACE))
1849 goto err_unlock; 1859 goto err_unlock;
1850 head = p->robust_list; 1860 head = p->robust_list;
1851 rcu_read_unlock(); 1861 rcu_read_unlock();
diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 04ac3a9e42cf..d607a5b9ee29 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -135,6 +135,7 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
135{ 135{
136 struct compat_robust_list_head __user *head; 136 struct compat_robust_list_head __user *head;
137 unsigned long ret; 137 unsigned long ret;
138 const struct cred *cred = current_cred(), *pcred;
138 139
139 if (!futex_cmpxchg_enabled) 140 if (!futex_cmpxchg_enabled)
140 return -ENOSYS; 141 return -ENOSYS;
@@ -150,8 +151,10 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
150 if (!p) 151 if (!p)
151 goto err_unlock; 152 goto err_unlock;
152 ret = -EPERM; 153 ret = -EPERM;
153 if ((current->euid != p->euid) && (current->euid != p->uid) && 154 pcred = __task_cred(p);
154 !capable(CAP_SYS_PTRACE)) 155 if (cred->euid != pcred->euid &&
156 cred->euid != pcred->uid &&
157 !capable(CAP_SYS_PTRACE))
155 goto err_unlock; 158 goto err_unlock;
156 head = p->compat_robust_list; 159 head = p->compat_robust_list;
157 read_unlock(&tasklist_lock); 160 read_unlock(&tasklist_lock);
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 3d3c3ea3a023..b46dbb908669 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -118,10 +118,10 @@ EXPORT_SYMBOL(request_module);
118struct subprocess_info { 118struct subprocess_info {
119 struct work_struct work; 119 struct work_struct work;
120 struct completion *complete; 120 struct completion *complete;
121 struct cred *cred;
121 char *path; 122 char *path;
122 char **argv; 123 char **argv;
123 char **envp; 124 char **envp;
124 struct key *ring;
125 enum umh_wait wait; 125 enum umh_wait wait;
126 int retval; 126 int retval;
127 struct file *stdin; 127 struct file *stdin;
@@ -134,19 +134,20 @@ struct subprocess_info {
134static int ____call_usermodehelper(void *data) 134static int ____call_usermodehelper(void *data)
135{ 135{
136 struct subprocess_info *sub_info = data; 136 struct subprocess_info *sub_info = data;
137 struct key *new_session, *old_session;
138 int retval; 137 int retval;
139 138
140 /* Unblock all signals and set the session keyring. */ 139 BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
141 new_session = key_get(sub_info->ring); 140
141 /* Unblock all signals */
142 spin_lock_irq(&current->sighand->siglock); 142 spin_lock_irq(&current->sighand->siglock);
143 old_session = __install_session_keyring(current, new_session);
144 flush_signal_handlers(current, 1); 143 flush_signal_handlers(current, 1);
145 sigemptyset(&current->blocked); 144 sigemptyset(&current->blocked);
146 recalc_sigpending(); 145 recalc_sigpending();
147 spin_unlock_irq(&current->sighand->siglock); 146 spin_unlock_irq(&current->sighand->siglock);
148 147
149 key_put(old_session); 148 /* Install the credentials */
149 commit_creds(sub_info->cred);
150 sub_info->cred = NULL;
150 151
151 /* Install input pipe when needed */ 152 /* Install input pipe when needed */
152 if (sub_info->stdin) { 153 if (sub_info->stdin) {
@@ -185,6 +186,8 @@ void call_usermodehelper_freeinfo(struct subprocess_info *info)
185{ 186{
186 if (info->cleanup) 187 if (info->cleanup)
187 (*info->cleanup)(info->argv, info->envp); 188 (*info->cleanup)(info->argv, info->envp);
189 if (info->cred)
190 put_cred(info->cred);
188 kfree(info); 191 kfree(info);
189} 192}
190EXPORT_SYMBOL(call_usermodehelper_freeinfo); 193EXPORT_SYMBOL(call_usermodehelper_freeinfo);
@@ -240,6 +243,8 @@ static void __call_usermodehelper(struct work_struct *work)
240 pid_t pid; 243 pid_t pid;
241 enum umh_wait wait = sub_info->wait; 244 enum umh_wait wait = sub_info->wait;
242 245
246 BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
247
243 /* CLONE_VFORK: wait until the usermode helper has execve'd 248 /* CLONE_VFORK: wait until the usermode helper has execve'd
244 * successfully We need the data structures to stay around 249 * successfully We need the data structures to stay around
245 * until that is done. */ 250 * until that is done. */
@@ -362,6 +367,9 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
362 sub_info->path = path; 367 sub_info->path = path;
363 sub_info->argv = argv; 368 sub_info->argv = argv;
364 sub_info->envp = envp; 369 sub_info->envp = envp;
370 sub_info->cred = prepare_usermodehelper_creds();
371 if (!sub_info->cred)
372 return NULL;
365 373
366 out: 374 out:
367 return sub_info; 375 return sub_info;
@@ -376,7 +384,13 @@ EXPORT_SYMBOL(call_usermodehelper_setup);
376void call_usermodehelper_setkeys(struct subprocess_info *info, 384void call_usermodehelper_setkeys(struct subprocess_info *info,
377 struct key *session_keyring) 385 struct key *session_keyring)
378{ 386{
379 info->ring = session_keyring; 387#ifdef CONFIG_KEYS
388 struct thread_group_cred *tgcred = info->cred->tgcred;
389 key_put(tgcred->session_keyring);
390 tgcred->session_keyring = key_get(session_keyring);
391#else
392 BUG();
393#endif
380} 394}
381EXPORT_SYMBOL(call_usermodehelper_setkeys); 395EXPORT_SYMBOL(call_usermodehelper_setkeys);
382 396
@@ -444,6 +458,8 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info,
444 DECLARE_COMPLETION_ONSTACK(done); 458 DECLARE_COMPLETION_ONSTACK(done);
445 int retval = 0; 459 int retval = 0;
446 460
461 BUG_ON(atomic_read(&sub_info->cred->usage) != 1);
462
447 helper_lock(); 463 helper_lock();
448 if (sub_info->path[0] == '\0') 464 if (sub_info->path[0] == '\0')
449 goto out; 465 goto out;
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 1e68e4c39e2c..f764b8806955 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -115,6 +115,8 @@ int ptrace_check_attach(struct task_struct *child, int kill)
115 115
116int __ptrace_may_access(struct task_struct *task, unsigned int mode) 116int __ptrace_may_access(struct task_struct *task, unsigned int mode)
117{ 117{
118 const struct cred *cred = current_cred(), *tcred;
119
118 /* May we inspect the given task? 120 /* May we inspect the given task?
119 * This check is used both for attaching with ptrace 121 * This check is used both for attaching with ptrace
120 * and for allowing access to sensitive information in /proc. 122 * and for allowing access to sensitive information in /proc.
@@ -127,13 +129,19 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
127 /* Don't let security modules deny introspection */ 129 /* Don't let security modules deny introspection */
128 if (task == current) 130 if (task == current)
129 return 0; 131 return 0;
130 if (((current->uid != task->euid) || 132 rcu_read_lock();
131 (current->uid != task->suid) || 133 tcred = __task_cred(task);
132 (current->uid != task->uid) || 134 if ((cred->uid != tcred->euid ||
133 (current->gid != task->egid) || 135 cred->uid != tcred->suid ||
134 (current->gid != task->sgid) || 136 cred->uid != tcred->uid ||
135 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE)) 137 cred->gid != tcred->egid ||
138 cred->gid != tcred->sgid ||
139 cred->gid != tcred->gid) &&
140 !capable(CAP_SYS_PTRACE)) {
141 rcu_read_unlock();
136 return -EPERM; 142 return -EPERM;
143 }
144 rcu_read_unlock();
137 smp_rmb(); 145 smp_rmb();
138 if (task->mm) 146 if (task->mm)
139 dumpable = get_dumpable(task->mm); 147 dumpable = get_dumpable(task->mm);
@@ -163,6 +171,14 @@ int ptrace_attach(struct task_struct *task)
163 if (same_thread_group(task, current)) 171 if (same_thread_group(task, current))
164 goto out; 172 goto out;
165 173
174 /* Protect exec's credential calculations against our interference;
175 * SUID, SGID and LSM creds get determined differently under ptrace.
176 */
177 retval = mutex_lock_interruptible(&current->cred_exec_mutex);
178 if (retval < 0)
179 goto out;
180
181 retval = -EPERM;
166repeat: 182repeat:
167 /* 183 /*
168 * Nasty, nasty. 184 * Nasty, nasty.
@@ -202,6 +218,7 @@ repeat:
202bad: 218bad:
203 write_unlock_irqrestore(&tasklist_lock, flags); 219 write_unlock_irqrestore(&tasklist_lock, flags);
204 task_unlock(task); 220 task_unlock(task);
221 mutex_unlock(&current->cred_exec_mutex);
205out: 222out:
206 return retval; 223 return retval;
207} 224}
diff --git a/kernel/sched.c b/kernel/sched.c
index c94baf2969e7..204d0662b438 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -345,7 +345,9 @@ static inline struct task_group *task_group(struct task_struct *p)
345 struct task_group *tg; 345 struct task_group *tg;
346 346
347#ifdef CONFIG_USER_SCHED 347#ifdef CONFIG_USER_SCHED
348 tg = p->user->tg; 348 rcu_read_lock();
349 tg = __task_cred(p)->user->tg;
350 rcu_read_unlock();
349#elif defined(CONFIG_CGROUP_SCHED) 351#elif defined(CONFIG_CGROUP_SCHED)
350 tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id), 352 tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
351 struct task_group, css); 353 struct task_group, css);
@@ -5133,6 +5135,22 @@ __setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
5133 set_load_weight(p); 5135 set_load_weight(p);
5134} 5136}
5135 5137
5138/*
5139 * check the target process has a UID that matches the current process's
5140 */
5141static bool check_same_owner(struct task_struct *p)
5142{
5143 const struct cred *cred = current_cred(), *pcred;
5144 bool match;
5145
5146 rcu_read_lock();
5147 pcred = __task_cred(p);
5148 match = (cred->euid == pcred->euid ||
5149 cred->euid == pcred->uid);
5150 rcu_read_unlock();
5151 return match;
5152}
5153
5136static int __sched_setscheduler(struct task_struct *p, int policy, 5154static int __sched_setscheduler(struct task_struct *p, int policy,
5137 struct sched_param *param, bool user) 5155 struct sched_param *param, bool user)
5138{ 5156{
@@ -5192,8 +5210,7 @@ recheck:
5192 return -EPERM; 5210 return -EPERM;
5193 5211
5194 /* can't change other user's priorities */ 5212 /* can't change other user's priorities */
5195 if ((current->euid != p->euid) && 5213 if (!check_same_owner(p))
5196 (current->euid != p->uid))
5197 return -EPERM; 5214 return -EPERM;
5198 } 5215 }
5199 5216
@@ -5425,8 +5442,7 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
5425 read_unlock(&tasklist_lock); 5442 read_unlock(&tasklist_lock);
5426 5443
5427 retval = -EPERM; 5444 retval = -EPERM;
5428 if ((current->euid != p->euid) && (current->euid != p->uid) && 5445 if (!check_same_owner(p) && !capable(CAP_SYS_NICE))
5429 !capable(CAP_SYS_NICE))
5430 goto out_unlock; 5446 goto out_unlock;
5431 5447
5432 retval = security_task_setscheduler(p, 0, NULL); 5448 retval = security_task_setscheduler(p, 0, NULL);
diff --git a/kernel/signal.c b/kernel/signal.c
index 4530fc654455..2a64304ed54b 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -177,6 +177,11 @@ int next_signal(struct sigpending *pending, sigset_t *mask)
177 return sig; 177 return sig;
178} 178}
179 179
180/*
181 * allocate a new signal queue record
182 * - this may be called without locks if and only if t == current, otherwise an
183 * appopriate lock must be held to stop the target task from exiting
184 */
180static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags, 185static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
181 int override_rlimit) 186 int override_rlimit)
182{ 187{
@@ -184,11 +189,12 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
184 struct user_struct *user; 189 struct user_struct *user;
185 190
186 /* 191 /*
187 * In order to avoid problems with "switch_user()", we want to make 192 * We won't get problems with the target's UID changing under us
188 * sure that the compiler doesn't re-load "t->user" 193 * because changing it requires RCU be used, and if t != current, the
194 * caller must be holding the RCU readlock (by way of a spinlock) and
195 * we use RCU protection here
189 */ 196 */
190 user = t->user; 197 user = get_uid(__task_cred(t)->user);
191 barrier();
192 atomic_inc(&user->sigpending); 198 atomic_inc(&user->sigpending);
193 if (override_rlimit || 199 if (override_rlimit ||
194 atomic_read(&user->sigpending) <= 200 atomic_read(&user->sigpending) <=
@@ -196,12 +202,14 @@ static struct sigqueue *__sigqueue_alloc(struct task_struct *t, gfp_t flags,
196 q = kmem_cache_alloc(sigqueue_cachep, flags); 202 q = kmem_cache_alloc(sigqueue_cachep, flags);
197 if (unlikely(q == NULL)) { 203 if (unlikely(q == NULL)) {
198 atomic_dec(&user->sigpending); 204 atomic_dec(&user->sigpending);
205 free_uid(user);
199 } else { 206 } else {
200 INIT_LIST_HEAD(&q->list); 207 INIT_LIST_HEAD(&q->list);
201 q->flags = 0; 208 q->flags = 0;
202 q->user = get_uid(user); 209 q->user = user;
203 } 210 }
204 return(q); 211
212 return q;
205} 213}
206 214
207static void __sigqueue_free(struct sigqueue *q) 215static void __sigqueue_free(struct sigqueue *q)
@@ -562,10 +570,12 @@ static int rm_from_queue(unsigned long mask, struct sigpending *s)
562 570
563/* 571/*
564 * Bad permissions for sending the signal 572 * Bad permissions for sending the signal
573 * - the caller must hold at least the RCU read lock
565 */ 574 */
566static int check_kill_permission(int sig, struct siginfo *info, 575static int check_kill_permission(int sig, struct siginfo *info,
567 struct task_struct *t) 576 struct task_struct *t)
568{ 577{
578 const struct cred *cred = current_cred(), *tcred;
569 struct pid *sid; 579 struct pid *sid;
570 int error; 580 int error;
571 581
@@ -579,8 +589,11 @@ static int check_kill_permission(int sig, struct siginfo *info,
579 if (error) 589 if (error)
580 return error; 590 return error;
581 591
582 if ((current->euid ^ t->suid) && (current->euid ^ t->uid) && 592 tcred = __task_cred(t);
583 (current->uid ^ t->suid) && (current->uid ^ t->uid) && 593 if ((cred->euid ^ tcred->suid) &&
594 (cred->euid ^ tcred->uid) &&
595 (cred->uid ^ tcred->suid) &&
596 (cred->uid ^ tcred->uid) &&
584 !capable(CAP_KILL)) { 597 !capable(CAP_KILL)) {
585 switch (sig) { 598 switch (sig) {
586 case SIGCONT: 599 case SIGCONT:
@@ -844,7 +857,7 @@ static int send_signal(int sig, struct siginfo *info, struct task_struct *t,
844 q->info.si_errno = 0; 857 q->info.si_errno = 0;
845 q->info.si_code = SI_USER; 858 q->info.si_code = SI_USER;
846 q->info.si_pid = task_pid_vnr(current); 859 q->info.si_pid = task_pid_vnr(current);
847 q->info.si_uid = current->uid; 860 q->info.si_uid = current_uid();
848 break; 861 break;
849 case (unsigned long) SEND_SIG_PRIV: 862 case (unsigned long) SEND_SIG_PRIV:
850 q->info.si_signo = sig; 863 q->info.si_signo = sig;
@@ -1008,6 +1021,10 @@ struct sighand_struct *lock_task_sighand(struct task_struct *tsk, unsigned long
1008 return sighand; 1021 return sighand;
1009} 1022}
1010 1023
1024/*
1025 * send signal info to all the members of a group
1026 * - the caller must hold the RCU read lock at least
1027 */
1011int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p) 1028int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
1012{ 1029{
1013 unsigned long flags; 1030 unsigned long flags;
@@ -1029,8 +1046,8 @@ int group_send_sig_info(int sig, struct siginfo *info, struct task_struct *p)
1029/* 1046/*
1030 * __kill_pgrp_info() sends a signal to a process group: this is what the tty 1047 * __kill_pgrp_info() sends a signal to a process group: this is what the tty
1031 * control characters do (^C, ^Z etc) 1048 * control characters do (^C, ^Z etc)
1049 * - the caller must hold at least a readlock on tasklist_lock
1032 */ 1050 */
1033
1034int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp) 1051int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp)
1035{ 1052{
1036 struct task_struct *p = NULL; 1053 struct task_struct *p = NULL;
@@ -1086,6 +1103,7 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
1086{ 1103{
1087 int ret = -EINVAL; 1104 int ret = -EINVAL;
1088 struct task_struct *p; 1105 struct task_struct *p;
1106 const struct cred *pcred;
1089 1107
1090 if (!valid_signal(sig)) 1108 if (!valid_signal(sig))
1091 return ret; 1109 return ret;
@@ -1096,9 +1114,11 @@ int kill_pid_info_as_uid(int sig, struct siginfo *info, struct pid *pid,
1096 ret = -ESRCH; 1114 ret = -ESRCH;
1097 goto out_unlock; 1115 goto out_unlock;
1098 } 1116 }
1099 if ((info == SEND_SIG_NOINFO || (!is_si_special(info) && SI_FROMUSER(info))) 1117 pcred = __task_cred(p);
1100 && (euid != p->suid) && (euid != p->uid) 1118 if ((info == SEND_SIG_NOINFO ||
1101 && (uid != p->suid) && (uid != p->uid)) { 1119 (!is_si_special(info) && SI_FROMUSER(info))) &&
1120 euid != pcred->suid && euid != pcred->uid &&
1121 uid != pcred->suid && uid != pcred->uid) {
1102 ret = -EPERM; 1122 ret = -EPERM;
1103 goto out_unlock; 1123 goto out_unlock;
1104 } 1124 }
@@ -1369,10 +1389,9 @@ int do_notify_parent(struct task_struct *tsk, int sig)
1369 */ 1389 */
1370 rcu_read_lock(); 1390 rcu_read_lock();
1371 info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns); 1391 info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
1392 info.si_uid = __task_cred(tsk)->uid;
1372 rcu_read_unlock(); 1393 rcu_read_unlock();
1373 1394
1374 info.si_uid = tsk->uid;
1375
1376 thread_group_cputime(tsk, &cputime); 1395 thread_group_cputime(tsk, &cputime);
1377 info.si_utime = cputime_to_jiffies(cputime.utime); 1396 info.si_utime = cputime_to_jiffies(cputime.utime);
1378 info.si_stime = cputime_to_jiffies(cputime.stime); 1397 info.si_stime = cputime_to_jiffies(cputime.stime);
@@ -1440,10 +1459,9 @@ static void do_notify_parent_cldstop(struct task_struct *tsk, int why)
1440 */ 1459 */
1441 rcu_read_lock(); 1460 rcu_read_lock();
1442 info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns); 1461 info.si_pid = task_pid_nr_ns(tsk, tsk->parent->nsproxy->pid_ns);
1462 info.si_uid = __task_cred(tsk)->uid;
1443 rcu_read_unlock(); 1463 rcu_read_unlock();
1444 1464
1445 info.si_uid = tsk->uid;
1446
1447 info.si_utime = cputime_to_clock_t(tsk->utime); 1465 info.si_utime = cputime_to_clock_t(tsk->utime);
1448 info.si_stime = cputime_to_clock_t(tsk->stime); 1466 info.si_stime = cputime_to_clock_t(tsk->stime);
1449 1467
@@ -1598,7 +1616,7 @@ void ptrace_notify(int exit_code)
1598 info.si_signo = SIGTRAP; 1616 info.si_signo = SIGTRAP;
1599 info.si_code = exit_code; 1617 info.si_code = exit_code;
1600 info.si_pid = task_pid_vnr(current); 1618 info.si_pid = task_pid_vnr(current);
1601 info.si_uid = current->uid; 1619 info.si_uid = current_uid();
1602 1620
1603 /* Let the debugger run. */ 1621 /* Let the debugger run. */
1604 spin_lock_irq(&current->sighand->siglock); 1622 spin_lock_irq(&current->sighand->siglock);
@@ -1710,7 +1728,7 @@ static int ptrace_signal(int signr, siginfo_t *info,
1710 info->si_errno = 0; 1728 info->si_errno = 0;
1711 info->si_code = SI_USER; 1729 info->si_code = SI_USER;
1712 info->si_pid = task_pid_vnr(current->parent); 1730 info->si_pid = task_pid_vnr(current->parent);
1713 info->si_uid = current->parent->uid; 1731 info->si_uid = task_uid(current->parent);
1714 } 1732 }
1715 1733
1716 /* If the (new) signal is now blocked, requeue it. */ 1734 /* If the (new) signal is now blocked, requeue it. */
@@ -2211,7 +2229,7 @@ sys_kill(pid_t pid, int sig)
2211 info.si_errno = 0; 2229 info.si_errno = 0;
2212 info.si_code = SI_USER; 2230 info.si_code = SI_USER;
2213 info.si_pid = task_tgid_vnr(current); 2231 info.si_pid = task_tgid_vnr(current);
2214 info.si_uid = current->uid; 2232 info.si_uid = current_uid();
2215 2233
2216 return kill_something_info(sig, &info, pid); 2234 return kill_something_info(sig, &info, pid);
2217} 2235}
@@ -2228,7 +2246,7 @@ static int do_tkill(pid_t tgid, pid_t pid, int sig)
2228 info.si_errno = 0; 2246 info.si_errno = 0;
2229 info.si_code = SI_TKILL; 2247 info.si_code = SI_TKILL;
2230 info.si_pid = task_tgid_vnr(current); 2248 info.si_pid = task_tgid_vnr(current);
2231 info.si_uid = current->uid; 2249 info.si_uid = current_uid();
2232 2250
2233 rcu_read_lock(); 2251 rcu_read_lock();
2234 p = find_task_by_vpid(pid); 2252 p = find_task_by_vpid(pid);
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8f7d16..ab735040468a 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -112,12 +112,17 @@ EXPORT_SYMBOL(cad_pid);
112 112
113void (*pm_power_off_prepare)(void); 113void (*pm_power_off_prepare)(void);
114 114
115/*
116 * set the priority of a task
117 * - the caller must hold the RCU read lock
118 */
115static int set_one_prio(struct task_struct *p, int niceval, int error) 119static int set_one_prio(struct task_struct *p, int niceval, int error)
116{ 120{
121 const struct cred *cred = current_cred(), *pcred = __task_cred(p);
117 int no_nice; 122 int no_nice;
118 123
119 if (p->uid != current->euid && 124 if (pcred->uid != cred->euid &&
120 p->euid != current->euid && !capable(CAP_SYS_NICE)) { 125 pcred->euid != cred->euid && !capable(CAP_SYS_NICE)) {
121 error = -EPERM; 126 error = -EPERM;
122 goto out; 127 goto out;
123 } 128 }
@@ -141,6 +146,7 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
141{ 146{
142 struct task_struct *g, *p; 147 struct task_struct *g, *p;
143 struct user_struct *user; 148 struct user_struct *user;
149 const struct cred *cred = current_cred();
144 int error = -EINVAL; 150 int error = -EINVAL;
145 struct pid *pgrp; 151 struct pid *pgrp;
146 152
@@ -174,18 +180,18 @@ asmlinkage long sys_setpriority(int which, int who, int niceval)
174 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); 180 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
175 break; 181 break;
176 case PRIO_USER: 182 case PRIO_USER:
177 user = current->user; 183 user = (struct user_struct *) cred->user;
178 if (!who) 184 if (!who)
179 who = current->uid; 185 who = cred->uid;
180 else 186 else if ((who != cred->uid) &&
181 if ((who != current->uid) && !(user = find_user(who))) 187 !(user = find_user(who)))
182 goto out_unlock; /* No processes for this user */ 188 goto out_unlock; /* No processes for this user */
183 189
184 do_each_thread(g, p) 190 do_each_thread(g, p)
185 if (p->uid == who) 191 if (__task_cred(p)->uid == who)
186 error = set_one_prio(p, niceval, error); 192 error = set_one_prio(p, niceval, error);
187 while_each_thread(g, p); 193 while_each_thread(g, p);
188 if (who != current->uid) 194 if (who != cred->uid)
189 free_uid(user); /* For find_user() */ 195 free_uid(user); /* For find_user() */
190 break; 196 break;
191 } 197 }
@@ -205,6 +211,7 @@ asmlinkage long sys_getpriority(int which, int who)
205{ 211{
206 struct task_struct *g, *p; 212 struct task_struct *g, *p;
207 struct user_struct *user; 213 struct user_struct *user;
214 const struct cred *cred = current_cred();
208 long niceval, retval = -ESRCH; 215 long niceval, retval = -ESRCH;
209 struct pid *pgrp; 216 struct pid *pgrp;
210 217
@@ -236,21 +243,21 @@ asmlinkage long sys_getpriority(int which, int who)
236 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); 243 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
237 break; 244 break;
238 case PRIO_USER: 245 case PRIO_USER:
239 user = current->user; 246 user = (struct user_struct *) cred->user;
240 if (!who) 247 if (!who)
241 who = current->uid; 248 who = cred->uid;
242 else 249 else if ((who != cred->uid) &&
243 if ((who != current->uid) && !(user = find_user(who))) 250 !(user = find_user(who)))
244 goto out_unlock; /* No processes for this user */ 251 goto out_unlock; /* No processes for this user */
245 252
246 do_each_thread(g, p) 253 do_each_thread(g, p)
247 if (p->uid == who) { 254 if (__task_cred(p)->uid == who) {
248 niceval = 20 - task_nice(p); 255 niceval = 20 - task_nice(p);
249 if (niceval > retval) 256 if (niceval > retval)
250 retval = niceval; 257 retval = niceval;
251 } 258 }
252 while_each_thread(g, p); 259 while_each_thread(g, p);
253 if (who != current->uid) 260 if (who != cred->uid)
254 free_uid(user); /* for find_user() */ 261 free_uid(user); /* for find_user() */
255 break; 262 break;
256 } 263 }
@@ -472,46 +479,48 @@ void ctrl_alt_del(void)
472 */ 479 */
473asmlinkage long sys_setregid(gid_t rgid, gid_t egid) 480asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
474{ 481{
475 int old_rgid = current->gid; 482 const struct cred *old;
476 int old_egid = current->egid; 483 struct cred *new;
477 int new_rgid = old_rgid;
478 int new_egid = old_egid;
479 int retval; 484 int retval;
480 485
486 new = prepare_creds();
487 if (!new)
488 return -ENOMEM;
489 old = current_cred();
490
481 retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE); 491 retval = security_task_setgid(rgid, egid, (gid_t)-1, LSM_SETID_RE);
482 if (retval) 492 if (retval)
483 return retval; 493 goto error;
484 494
495 retval = -EPERM;
485 if (rgid != (gid_t) -1) { 496 if (rgid != (gid_t) -1) {
486 if ((old_rgid == rgid) || 497 if (old->gid == rgid ||
487 (current->egid==rgid) || 498 old->egid == rgid ||
488 capable(CAP_SETGID)) 499 capable(CAP_SETGID))
489 new_rgid = rgid; 500 new->gid = rgid;
490 else 501 else
491 return -EPERM; 502 goto error;
492 } 503 }
493 if (egid != (gid_t) -1) { 504 if (egid != (gid_t) -1) {
494 if ((old_rgid == egid) || 505 if (old->gid == egid ||
495 (current->egid == egid) || 506 old->egid == egid ||
496 (current->sgid == egid) || 507 old->sgid == egid ||
497 capable(CAP_SETGID)) 508 capable(CAP_SETGID))
498 new_egid = egid; 509 new->egid = egid;
499 else 510 else
500 return -EPERM; 511 goto error;
501 }
502 if (new_egid != old_egid) {
503 set_dumpable(current->mm, suid_dumpable);
504 smp_wmb();
505 } 512 }
513
506 if (rgid != (gid_t) -1 || 514 if (rgid != (gid_t) -1 ||
507 (egid != (gid_t) -1 && egid != old_rgid)) 515 (egid != (gid_t) -1 && egid != old->gid))
508 current->sgid = new_egid; 516 new->sgid = new->egid;
509 current->fsgid = new_egid; 517 new->fsgid = new->egid;
510 current->egid = new_egid; 518
511 current->gid = new_rgid; 519 return commit_creds(new);
512 key_fsgid_changed(current); 520
513 proc_id_connector(current, PROC_EVENT_GID); 521error:
514 return 0; 522 abort_creds(new);
523 return retval;
515} 524}
516 525
517/* 526/*
@@ -521,39 +530,42 @@ asmlinkage long sys_setregid(gid_t rgid, gid_t egid)
521 */ 530 */
522asmlinkage long sys_setgid(gid_t gid) 531asmlinkage long sys_setgid(gid_t gid)
523{ 532{
524 int old_egid = current->egid; 533 const struct cred *old;
534 struct cred *new;
525 int retval; 535 int retval;
526 536
537 new = prepare_creds();
538 if (!new)
539 return -ENOMEM;
540 old = current_cred();
541
527 retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID); 542 retval = security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_ID);
528 if (retval) 543 if (retval)
529 return retval; 544 goto error;
530 545
531 if (capable(CAP_SETGID)) { 546 retval = -EPERM;
532 if (old_egid != gid) { 547 if (capable(CAP_SETGID))
533 set_dumpable(current->mm, suid_dumpable); 548 new->gid = new->egid = new->sgid = new->fsgid = gid;
534 smp_wmb(); 549 else if (gid == old->gid || gid == old->sgid)
535 } 550 new->egid = new->fsgid = gid;
536 current->gid = current->egid = current->sgid = current->fsgid = gid;
537 } else if ((gid == current->gid) || (gid == current->sgid)) {
538 if (old_egid != gid) {
539 set_dumpable(current->mm, suid_dumpable);
540 smp_wmb();
541 }
542 current->egid = current->fsgid = gid;
543 }
544 else 551 else
545 return -EPERM; 552 goto error;
546 553
547 key_fsgid_changed(current); 554 return commit_creds(new);
548 proc_id_connector(current, PROC_EVENT_GID); 555
549 return 0; 556error:
557 abort_creds(new);
558 return retval;
550} 559}
551 560
552static int set_user(uid_t new_ruid, int dumpclear) 561/*
562 * change the user struct in a credentials set to match the new UID
563 */
564static int set_user(struct cred *new)
553{ 565{
554 struct user_struct *new_user; 566 struct user_struct *new_user;
555 567
556 new_user = alloc_uid(current->nsproxy->user_ns, new_ruid); 568 new_user = alloc_uid(current->nsproxy->user_ns, new->uid);
557 if (!new_user) 569 if (!new_user)
558 return -EAGAIN; 570 return -EAGAIN;
559 571
@@ -564,13 +576,8 @@ static int set_user(uid_t new_ruid, int dumpclear)
564 return -EAGAIN; 576 return -EAGAIN;
565 } 577 }
566 578
567 switch_uid(new_user); 579 free_uid(new->user);
568 580 new->user = new_user;
569 if (dumpclear) {
570 set_dumpable(current->mm, suid_dumpable);
571 smp_wmb();
572 }
573 current->uid = new_ruid;
574 return 0; 581 return 0;
575} 582}
576 583
@@ -591,54 +598,56 @@ static int set_user(uid_t new_ruid, int dumpclear)
591 */ 598 */
592asmlinkage long sys_setreuid(uid_t ruid, uid_t euid) 599asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
593{ 600{
594 int old_ruid, old_euid, old_suid, new_ruid, new_euid; 601 const struct cred *old;
602 struct cred *new;
595 int retval; 603 int retval;
596 604
605 new = prepare_creds();
606 if (!new)
607 return -ENOMEM;
608 old = current_cred();
609
597 retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE); 610 retval = security_task_setuid(ruid, euid, (uid_t)-1, LSM_SETID_RE);
598 if (retval) 611 if (retval)
599 return retval; 612 goto error;
600
601 new_ruid = old_ruid = current->uid;
602 new_euid = old_euid = current->euid;
603 old_suid = current->suid;
604 613
614 retval = -EPERM;
605 if (ruid != (uid_t) -1) { 615 if (ruid != (uid_t) -1) {
606 new_ruid = ruid; 616 new->uid = ruid;
607 if ((old_ruid != ruid) && 617 if (old->uid != ruid &&
608 (current->euid != ruid) && 618 old->euid != ruid &&
609 !capable(CAP_SETUID)) 619 !capable(CAP_SETUID))
610 return -EPERM; 620 goto error;
611 } 621 }
612 622
613 if (euid != (uid_t) -1) { 623 if (euid != (uid_t) -1) {
614 new_euid = euid; 624 new->euid = euid;
615 if ((old_ruid != euid) && 625 if (old->uid != euid &&
616 (current->euid != euid) && 626 old->euid != euid &&
617 (current->suid != euid) && 627 old->suid != euid &&
618 !capable(CAP_SETUID)) 628 !capable(CAP_SETUID))
619 return -EPERM; 629 goto error;
620 } 630 }
621 631
622 if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0) 632 retval = -EAGAIN;
623 return -EAGAIN; 633 if (new->uid != old->uid && set_user(new) < 0)
634 goto error;
624 635
625 if (new_euid != old_euid) {
626 set_dumpable(current->mm, suid_dumpable);
627 smp_wmb();
628 }
629 current->fsuid = current->euid = new_euid;
630 if (ruid != (uid_t) -1 || 636 if (ruid != (uid_t) -1 ||
631 (euid != (uid_t) -1 && euid != old_ruid)) 637 (euid != (uid_t) -1 && euid != old->uid))
632 current->suid = current->euid; 638 new->suid = new->euid;
633 current->fsuid = current->euid; 639 new->fsuid = new->euid;
634 640
635 key_fsuid_changed(current); 641 retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
636 proc_id_connector(current, PROC_EVENT_UID); 642 if (retval < 0)
637 643 goto error;
638 return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
639}
640 644
645 return commit_creds(new);
641 646
647error:
648 abort_creds(new);
649 return retval;
650}
642 651
643/* 652/*
644 * setuid() is implemented like SysV with SAVED_IDS 653 * setuid() is implemented like SysV with SAVED_IDS
@@ -653,36 +662,41 @@ asmlinkage long sys_setreuid(uid_t ruid, uid_t euid)
653 */ 662 */
654asmlinkage long sys_setuid(uid_t uid) 663asmlinkage long sys_setuid(uid_t uid)
655{ 664{
656 int old_euid = current->euid; 665 const struct cred *old;
657 int old_ruid, old_suid, new_suid; 666 struct cred *new;
658 int retval; 667 int retval;
659 668
669 new = prepare_creds();
670 if (!new)
671 return -ENOMEM;
672 old = current_cred();
673
660 retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID); 674 retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
661 if (retval) 675 if (retval)
662 return retval; 676 goto error;
663 677
664 old_ruid = current->uid; 678 retval = -EPERM;
665 old_suid = current->suid;
666 new_suid = old_suid;
667
668 if (capable(CAP_SETUID)) { 679 if (capable(CAP_SETUID)) {
669 if (uid != old_ruid && set_user(uid, old_euid != uid) < 0) 680 new->suid = new->uid = uid;
670 return -EAGAIN; 681 if (uid != old->uid && set_user(new) < 0) {
671 new_suid = uid; 682 retval = -EAGAIN;
672 } else if ((uid != current->uid) && (uid != new_suid)) 683 goto error;
673 return -EPERM; 684 }
674 685 } else if (uid != old->uid && uid != new->suid) {
675 if (old_euid != uid) { 686 goto error;
676 set_dumpable(current->mm, suid_dumpable);
677 smp_wmb();
678 } 687 }
679 current->fsuid = current->euid = uid;
680 current->suid = new_suid;
681 688
682 key_fsuid_changed(current); 689 new->fsuid = new->euid = uid;
683 proc_id_connector(current, PROC_EVENT_UID); 690
691 retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
692 if (retval < 0)
693 goto error;
684 694
685 return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID); 695 return commit_creds(new);
696
697error:
698 abort_creds(new);
699 return retval;
686} 700}
687 701
688 702
@@ -692,54 +706,63 @@ asmlinkage long sys_setuid(uid_t uid)
692 */ 706 */
693asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) 707asmlinkage long sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
694{ 708{
695 int old_ruid = current->uid; 709 const struct cred *old;
696 int old_euid = current->euid; 710 struct cred *new;
697 int old_suid = current->suid;
698 int retval; 711 int retval;
699 712
713 new = prepare_creds();
714 if (!new)
715 return -ENOMEM;
716
700 retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES); 717 retval = security_task_setuid(ruid, euid, suid, LSM_SETID_RES);
701 if (retval) 718 if (retval)
702 return retval; 719 goto error;
720 old = current_cred();
703 721
722 retval = -EPERM;
704 if (!capable(CAP_SETUID)) { 723 if (!capable(CAP_SETUID)) {
705 if ((ruid != (uid_t) -1) && (ruid != current->uid) && 724 if (ruid != (uid_t) -1 && ruid != old->uid &&
706 (ruid != current->euid) && (ruid != current->suid)) 725 ruid != old->euid && ruid != old->suid)
707 return -EPERM; 726 goto error;
708 if ((euid != (uid_t) -1) && (euid != current->uid) && 727 if (euid != (uid_t) -1 && euid != old->uid &&
709 (euid != current->euid) && (euid != current->suid)) 728 euid != old->euid && euid != old->suid)
710 return -EPERM; 729 goto error;
711 if ((suid != (uid_t) -1) && (suid != current->uid) && 730 if (suid != (uid_t) -1 && suid != old->uid &&
712 (suid != current->euid) && (suid != current->suid)) 731 suid != old->euid && suid != old->suid)
713 return -EPERM; 732 goto error;
714 } 733 }
734
735 retval = -EAGAIN;
715 if (ruid != (uid_t) -1) { 736 if (ruid != (uid_t) -1) {
716 if (ruid != current->uid && set_user(ruid, euid != current->euid) < 0) 737 new->uid = ruid;
717 return -EAGAIN; 738 if (ruid != old->uid && set_user(new) < 0)
739 goto error;
718 } 740 }
719 if (euid != (uid_t) -1) { 741 if (euid != (uid_t) -1)
720 if (euid != current->euid) { 742 new->euid = euid;
721 set_dumpable(current->mm, suid_dumpable);
722 smp_wmb();
723 }
724 current->euid = euid;
725 }
726 current->fsuid = current->euid;
727 if (suid != (uid_t) -1) 743 if (suid != (uid_t) -1)
728 current->suid = suid; 744 new->suid = suid;
745 new->fsuid = new->euid;
746
747 retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
748 if (retval < 0)
749 goto error;
729 750
730 key_fsuid_changed(current); 751 return commit_creds(new);
731 proc_id_connector(current, PROC_EVENT_UID);
732 752
733 return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES); 753error:
754 abort_creds(new);
755 return retval;
734} 756}
735 757
736asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid) 758asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __user *suid)
737{ 759{
760 const struct cred *cred = current_cred();
738 int retval; 761 int retval;
739 762
740 if (!(retval = put_user(current->uid, ruid)) && 763 if (!(retval = put_user(cred->uid, ruid)) &&
741 !(retval = put_user(current->euid, euid))) 764 !(retval = put_user(cred->euid, euid)))
742 retval = put_user(current->suid, suid); 765 retval = put_user(cred->suid, suid);
743 766
744 return retval; 767 return retval;
745} 768}
@@ -749,48 +772,55 @@ asmlinkage long sys_getresuid(uid_t __user *ruid, uid_t __user *euid, uid_t __us
749 */ 772 */
750asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) 773asmlinkage long sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
751{ 774{
775 const struct cred *old;
776 struct cred *new;
752 int retval; 777 int retval;
753 778
779 new = prepare_creds();
780 if (!new)
781 return -ENOMEM;
782 old = current_cred();
783
754 retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES); 784 retval = security_task_setgid(rgid, egid, sgid, LSM_SETID_RES);
755 if (retval) 785 if (retval)
756 return retval; 786 goto error;
757 787
788 retval = -EPERM;
758 if (!capable(CAP_SETGID)) { 789 if (!capable(CAP_SETGID)) {
759 if ((rgid != (gid_t) -1) && (rgid != current->gid) && 790 if (rgid != (gid_t) -1 && rgid != old->gid &&
760 (rgid != current->egid) && (rgid != current->sgid)) 791 rgid != old->egid && rgid != old->sgid)
761 return -EPERM; 792 goto error;
762 if ((egid != (gid_t) -1) && (egid != current->gid) && 793 if (egid != (gid_t) -1 && egid != old->gid &&
763 (egid != current->egid) && (egid != current->sgid)) 794 egid != old->egid && egid != old->sgid)
764 return -EPERM; 795 goto error;
765 if ((sgid != (gid_t) -1) && (sgid != current->gid) && 796 if (sgid != (gid_t) -1 && sgid != old->gid &&
766 (sgid != current->egid) && (sgid != current->sgid)) 797 sgid != old->egid && sgid != old->sgid)
767 return -EPERM; 798 goto error;
768 } 799 }
769 if (egid != (gid_t) -1) { 800
770 if (egid != current->egid) {
771 set_dumpable(current->mm, suid_dumpable);
772 smp_wmb();
773 }
774 current->egid = egid;
775 }
776 current->fsgid = current->egid;
777 if (rgid != (gid_t) -1) 801 if (rgid != (gid_t) -1)
778 current->gid = rgid; 802 new->gid = rgid;
803 if (egid != (gid_t) -1)
804 new->egid = egid;
779 if (sgid != (gid_t) -1) 805 if (sgid != (gid_t) -1)
780 current->sgid = sgid; 806 new->sgid = sgid;
807 new->fsgid = new->egid;
781 808
782 key_fsgid_changed(current); 809 return commit_creds(new);
783 proc_id_connector(current, PROC_EVENT_GID); 810
784 return 0; 811error:
812 abort_creds(new);
813 return retval;
785} 814}
786 815
787asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid) 816asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __user *sgid)
788{ 817{
818 const struct cred *cred = current_cred();
789 int retval; 819 int retval;
790 820
791 if (!(retval = put_user(current->gid, rgid)) && 821 if (!(retval = put_user(cred->gid, rgid)) &&
792 !(retval = put_user(current->egid, egid))) 822 !(retval = put_user(cred->egid, egid)))
793 retval = put_user(current->sgid, sgid); 823 retval = put_user(cred->sgid, sgid);
794 824
795 return retval; 825 return retval;
796} 826}
@@ -804,27 +834,35 @@ asmlinkage long sys_getresgid(gid_t __user *rgid, gid_t __user *egid, gid_t __us
804 */ 834 */
805asmlinkage long sys_setfsuid(uid_t uid) 835asmlinkage long sys_setfsuid(uid_t uid)
806{ 836{
807 int old_fsuid; 837 const struct cred *old;
838 struct cred *new;
839 uid_t old_fsuid;
808 840
809 old_fsuid = current->fsuid; 841 new = prepare_creds();
810 if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS)) 842 if (!new)
811 return old_fsuid; 843 return current_fsuid();
844 old = current_cred();
845 old_fsuid = old->fsuid;
812 846
813 if (uid == current->uid || uid == current->euid || 847 if (security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS) < 0)
814 uid == current->suid || uid == current->fsuid || 848 goto error;
849
850 if (uid == old->uid || uid == old->euid ||
851 uid == old->suid || uid == old->fsuid ||
815 capable(CAP_SETUID)) { 852 capable(CAP_SETUID)) {
816 if (uid != old_fsuid) { 853 if (uid != old_fsuid) {
817 set_dumpable(current->mm, suid_dumpable); 854 new->fsuid = uid;
818 smp_wmb(); 855 if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
856 goto change_okay;
819 } 857 }
820 current->fsuid = uid;
821 } 858 }
822 859
823 key_fsuid_changed(current); 860error:
824 proc_id_connector(current, PROC_EVENT_UID); 861 abort_creds(new);
825 862 return old_fsuid;
826 security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
827 863
864change_okay:
865 commit_creds(new);
828 return old_fsuid; 866 return old_fsuid;
829} 867}
830 868
@@ -833,23 +871,34 @@ asmlinkage long sys_setfsuid(uid_t uid)
833 */ 871 */
834asmlinkage long sys_setfsgid(gid_t gid) 872asmlinkage long sys_setfsgid(gid_t gid)
835{ 873{
836 int old_fsgid; 874 const struct cred *old;
875 struct cred *new;
876 gid_t old_fsgid;
877
878 new = prepare_creds();
879 if (!new)
880 return current_fsgid();
881 old = current_cred();
882 old_fsgid = old->fsgid;
837 883
838 old_fsgid = current->fsgid;
839 if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS)) 884 if (security_task_setgid(gid, (gid_t)-1, (gid_t)-1, LSM_SETID_FS))
840 return old_fsgid; 885 goto error;
841 886
842 if (gid == current->gid || gid == current->egid || 887 if (gid == old->gid || gid == old->egid ||
843 gid == current->sgid || gid == current->fsgid || 888 gid == old->sgid || gid == old->fsgid ||
844 capable(CAP_SETGID)) { 889 capable(CAP_SETGID)) {
845 if (gid != old_fsgid) { 890 if (gid != old_fsgid) {
846 set_dumpable(current->mm, suid_dumpable); 891 new->fsgid = gid;
847 smp_wmb(); 892 goto change_okay;
848 } 893 }
849 current->fsgid = gid;
850 key_fsgid_changed(current);
851 proc_id_connector(current, PROC_EVENT_GID);
852 } 894 }
895
896error:
897 abort_creds(new);
898 return old_fsgid;
899
900change_okay:
901 commit_creds(new);
853 return old_fsgid; 902 return old_fsgid;
854} 903}
855 904
@@ -1118,7 +1167,7 @@ EXPORT_SYMBOL(groups_free);
1118 1167
1119/* export the group_info to a user-space array */ 1168/* export the group_info to a user-space array */
1120static int groups_to_user(gid_t __user *grouplist, 1169static int groups_to_user(gid_t __user *grouplist,
1121 struct group_info *group_info) 1170 const struct group_info *group_info)
1122{ 1171{
1123 int i; 1172 int i;
1124 unsigned int count = group_info->ngroups; 1173 unsigned int count = group_info->ngroups;
@@ -1186,7 +1235,7 @@ static void groups_sort(struct group_info *group_info)
1186} 1235}
1187 1236
1188/* a simple bsearch */ 1237/* a simple bsearch */
1189int groups_search(struct group_info *group_info, gid_t grp) 1238int groups_search(const struct group_info *group_info, gid_t grp)
1190{ 1239{
1191 unsigned int left, right; 1240 unsigned int left, right;
1192 1241
@@ -1208,51 +1257,74 @@ int groups_search(struct group_info *group_info, gid_t grp)
1208 return 0; 1257 return 0;
1209} 1258}
1210 1259
1211/* validate and set current->group_info */ 1260/**
1212int set_current_groups(struct group_info *group_info) 1261 * set_groups - Change a group subscription in a set of credentials
1262 * @new: The newly prepared set of credentials to alter
1263 * @group_info: The group list to install
1264 *
1265 * Validate a group subscription and, if valid, insert it into a set
1266 * of credentials.
1267 */
1268int set_groups(struct cred *new, struct group_info *group_info)
1213{ 1269{
1214 int retval; 1270 int retval;
1215 struct group_info *old_info;
1216 1271
1217 retval = security_task_setgroups(group_info); 1272 retval = security_task_setgroups(group_info);
1218 if (retval) 1273 if (retval)
1219 return retval; 1274 return retval;
1220 1275
1276 put_group_info(new->group_info);
1221 groups_sort(group_info); 1277 groups_sort(group_info);
1222 get_group_info(group_info); 1278 get_group_info(group_info);
1279 new->group_info = group_info;
1280 return 0;
1281}
1282
1283EXPORT_SYMBOL(set_groups);
1223 1284
1224 task_lock(current); 1285/**
1225 old_info = current->group_info; 1286 * set_current_groups - Change current's group subscription
1226 current->group_info = group_info; 1287 * @group_info: The group list to impose
1227 task_unlock(current); 1288 *
1289 * Validate a group subscription and, if valid, impose it upon current's task
1290 * security record.
1291 */
1292int set_current_groups(struct group_info *group_info)
1293{
1294 struct cred *new;
1295 int ret;
1228 1296
1229 put_group_info(old_info); 1297 new = prepare_creds();
1298 if (!new)
1299 return -ENOMEM;
1230 1300
1231 return 0; 1301 ret = set_groups(new, group_info);
1302 if (ret < 0) {
1303 abort_creds(new);
1304 return ret;
1305 }
1306
1307 return commit_creds(new);
1232} 1308}
1233 1309
1234EXPORT_SYMBOL(set_current_groups); 1310EXPORT_SYMBOL(set_current_groups);
1235 1311
1236asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist) 1312asmlinkage long sys_getgroups(int gidsetsize, gid_t __user *grouplist)
1237{ 1313{
1238 int i = 0; 1314 const struct cred *cred = current_cred();
1239 1315 int i;
1240 /*
1241 * SMP: Nobody else can change our grouplist. Thus we are
1242 * safe.
1243 */
1244 1316
1245 if (gidsetsize < 0) 1317 if (gidsetsize < 0)
1246 return -EINVAL; 1318 return -EINVAL;
1247 1319
1248 /* no need to grab task_lock here; it cannot change */ 1320 /* no need to grab task_lock here; it cannot change */
1249 i = current->group_info->ngroups; 1321 i = cred->group_info->ngroups;
1250 if (gidsetsize) { 1322 if (gidsetsize) {
1251 if (i > gidsetsize) { 1323 if (i > gidsetsize) {
1252 i = -EINVAL; 1324 i = -EINVAL;
1253 goto out; 1325 goto out;
1254 } 1326 }
1255 if (groups_to_user(grouplist, current->group_info)) { 1327 if (groups_to_user(grouplist, cred->group_info)) {
1256 i = -EFAULT; 1328 i = -EFAULT;
1257 goto out; 1329 goto out;
1258 } 1330 }
@@ -1296,9 +1368,11 @@ asmlinkage long sys_setgroups(int gidsetsize, gid_t __user *grouplist)
1296 */ 1368 */
1297int in_group_p(gid_t grp) 1369int in_group_p(gid_t grp)
1298{ 1370{
1371 const struct cred *cred = current_cred();
1299 int retval = 1; 1372 int retval = 1;
1300 if (grp != current->fsgid) 1373
1301 retval = groups_search(current->group_info, grp); 1374 if (grp != cred->fsgid)
1375 retval = groups_search(cred->group_info, grp);
1302 return retval; 1376 return retval;
1303} 1377}
1304 1378
@@ -1306,9 +1380,11 @@ EXPORT_SYMBOL(in_group_p);
1306 1380
1307int in_egroup_p(gid_t grp) 1381int in_egroup_p(gid_t grp)
1308{ 1382{
1383 const struct cred *cred = current_cred();
1309 int retval = 1; 1384 int retval = 1;
1310 if (grp != current->egid) 1385
1311 retval = groups_search(current->group_info, grp); 1386 if (grp != cred->egid)
1387 retval = groups_search(cred->group_info, grp);
1312 return retval; 1388 return retval;
1313} 1389}
1314 1390
@@ -1624,50 +1700,56 @@ asmlinkage long sys_umask(int mask)
1624asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3, 1700asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
1625 unsigned long arg4, unsigned long arg5) 1701 unsigned long arg4, unsigned long arg5)
1626{ 1702{
1627 long error = 0; 1703 struct task_struct *me = current;
1704 unsigned char comm[sizeof(me->comm)];
1705 long error;
1628 1706
1629 if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error)) 1707 error = security_task_prctl(option, arg2, arg3, arg4, arg5);
1708 if (error != -ENOSYS)
1630 return error; 1709 return error;
1631 1710
1711 error = 0;
1632 switch (option) { 1712 switch (option) {
1633 case PR_SET_PDEATHSIG: 1713 case PR_SET_PDEATHSIG:
1634 if (!valid_signal(arg2)) { 1714 if (!valid_signal(arg2)) {
1635 error = -EINVAL; 1715 error = -EINVAL;
1636 break; 1716 break;
1637 } 1717 }
1638 current->pdeath_signal = arg2; 1718 me->pdeath_signal = arg2;
1719 error = 0;
1639 break; 1720 break;
1640 case PR_GET_PDEATHSIG: 1721 case PR_GET_PDEATHSIG:
1641 error = put_user(current->pdeath_signal, (int __user *)arg2); 1722 error = put_user(me->pdeath_signal, (int __user *)arg2);
1642 break; 1723 break;
1643 case PR_GET_DUMPABLE: 1724 case PR_GET_DUMPABLE:
1644 error = get_dumpable(current->mm); 1725 error = get_dumpable(me->mm);
1645 break; 1726 break;
1646 case PR_SET_DUMPABLE: 1727 case PR_SET_DUMPABLE:
1647 if (arg2 < 0 || arg2 > 1) { 1728 if (arg2 < 0 || arg2 > 1) {
1648 error = -EINVAL; 1729 error = -EINVAL;
1649 break; 1730 break;
1650 } 1731 }
1651 set_dumpable(current->mm, arg2); 1732 set_dumpable(me->mm, arg2);
1733 error = 0;
1652 break; 1734 break;
1653 1735
1654 case PR_SET_UNALIGN: 1736 case PR_SET_UNALIGN:
1655 error = SET_UNALIGN_CTL(current, arg2); 1737 error = SET_UNALIGN_CTL(me, arg2);
1656 break; 1738 break;
1657 case PR_GET_UNALIGN: 1739 case PR_GET_UNALIGN:
1658 error = GET_UNALIGN_CTL(current, arg2); 1740 error = GET_UNALIGN_CTL(me, arg2);
1659 break; 1741 break;
1660 case PR_SET_FPEMU: 1742 case PR_SET_FPEMU:
1661 error = SET_FPEMU_CTL(current, arg2); 1743 error = SET_FPEMU_CTL(me, arg2);
1662 break; 1744 break;
1663 case PR_GET_FPEMU: 1745 case PR_GET_FPEMU:
1664 error = GET_FPEMU_CTL(current, arg2); 1746 error = GET_FPEMU_CTL(me, arg2);
1665 break; 1747 break;
1666 case PR_SET_FPEXC: 1748 case PR_SET_FPEXC:
1667 error = SET_FPEXC_CTL(current, arg2); 1749 error = SET_FPEXC_CTL(me, arg2);
1668 break; 1750 break;
1669 case PR_GET_FPEXC: 1751 case PR_GET_FPEXC:
1670 error = GET_FPEXC_CTL(current, arg2); 1752 error = GET_FPEXC_CTL(me, arg2);
1671 break; 1753 break;
1672 case PR_GET_TIMING: 1754 case PR_GET_TIMING:
1673 error = PR_TIMING_STATISTICAL; 1755 error = PR_TIMING_STATISTICAL;
@@ -1675,33 +1757,28 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
1675 case PR_SET_TIMING: 1757 case PR_SET_TIMING:
1676 if (arg2 != PR_TIMING_STATISTICAL) 1758 if (arg2 != PR_TIMING_STATISTICAL)
1677 error = -EINVAL; 1759 error = -EINVAL;
1760 else
1761 error = 0;
1678 break; 1762 break;
1679 1763
1680 case PR_SET_NAME: { 1764 case PR_SET_NAME:
1681 struct task_struct *me = current; 1765 comm[sizeof(me->comm)-1] = 0;
1682 unsigned char ncomm[sizeof(me->comm)]; 1766 if (strncpy_from_user(comm, (char __user *)arg2,
1683 1767 sizeof(me->comm) - 1) < 0)
1684 ncomm[sizeof(me->comm)-1] = 0;
1685 if (strncpy_from_user(ncomm, (char __user *)arg2,
1686 sizeof(me->comm)-1) < 0)
1687 return -EFAULT; 1768 return -EFAULT;
1688 set_task_comm(me, ncomm); 1769 set_task_comm(me, comm);
1689 return 0; 1770 return 0;
1690 } 1771 case PR_GET_NAME:
1691 case PR_GET_NAME: { 1772 get_task_comm(comm, me);
1692 struct task_struct *me = current; 1773 if (copy_to_user((char __user *)arg2, comm,
1693 unsigned char tcomm[sizeof(me->comm)]; 1774 sizeof(comm)))
1694
1695 get_task_comm(tcomm, me);
1696 if (copy_to_user((char __user *)arg2, tcomm, sizeof(tcomm)))
1697 return -EFAULT; 1775 return -EFAULT;
1698 return 0; 1776 return 0;
1699 }
1700 case PR_GET_ENDIAN: 1777 case PR_GET_ENDIAN:
1701 error = GET_ENDIAN(current, arg2); 1778 error = GET_ENDIAN(me, arg2);
1702 break; 1779 break;
1703 case PR_SET_ENDIAN: 1780 case PR_SET_ENDIAN:
1704 error = SET_ENDIAN(current, arg2); 1781 error = SET_ENDIAN(me, arg2);
1705 break; 1782 break;
1706 1783
1707 case PR_GET_SECCOMP: 1784 case PR_GET_SECCOMP:
@@ -1725,6 +1802,7 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
1725 current->default_timer_slack_ns; 1802 current->default_timer_slack_ns;
1726 else 1803 else
1727 current->timer_slack_ns = arg2; 1804 current->timer_slack_ns = arg2;
1805 error = 0;
1728 break; 1806 break;
1729 default: 1807 default:
1730 error = -EINVAL; 1808 error = -EINVAL;
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 9d048fa2d902..511031381c33 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1641,7 +1641,7 @@ out:
1641 1641
1642static int test_perm(int mode, int op) 1642static int test_perm(int mode, int op)
1643{ 1643{
1644 if (!current->euid) 1644 if (!current_euid())
1645 mode >>= 6; 1645 mode >>= 6;
1646 else if (in_egroup_p(0)) 1646 else if (in_egroup_p(0))
1647 mode >>= 3; 1647 mode >>= 3;
diff --git a/kernel/timer.c b/kernel/timer.c
index dbd50fabe4c7..566257d1dc10 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1192,25 +1192,25 @@ asmlinkage long sys_getppid(void)
1192asmlinkage long sys_getuid(void) 1192asmlinkage long sys_getuid(void)
1193{ 1193{
1194 /* Only we change this so SMP safe */ 1194 /* Only we change this so SMP safe */
1195 return current->uid; 1195 return current_uid();
1196} 1196}
1197 1197
1198asmlinkage long sys_geteuid(void) 1198asmlinkage long sys_geteuid(void)
1199{ 1199{
1200 /* Only we change this so SMP safe */ 1200 /* Only we change this so SMP safe */
1201 return current->euid; 1201 return current_euid();
1202} 1202}
1203 1203
1204asmlinkage long sys_getgid(void) 1204asmlinkage long sys_getgid(void)
1205{ 1205{
1206 /* Only we change this so SMP safe */ 1206 /* Only we change this so SMP safe */
1207 return current->gid; 1207 return current_gid();
1208} 1208}
1209 1209
1210asmlinkage long sys_getegid(void) 1210asmlinkage long sys_getegid(void)
1211{ 1211{
1212 /* Only we change this so SMP safe */ 1212 /* Only we change this so SMP safe */
1213 return current->egid; 1213 return current_egid();
1214} 1214}
1215 1215
1216#endif 1216#endif
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 697eda36b86a..ffe7c96fa09b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -246,7 +246,7 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
246 246
247 memcpy(data->comm, tsk->comm, TASK_COMM_LEN); 247 memcpy(data->comm, tsk->comm, TASK_COMM_LEN);
248 data->pid = tsk->pid; 248 data->pid = tsk->pid;
249 data->uid = tsk->uid; 249 data->uid = task_uid(tsk);
250 data->nice = tsk->static_prio - 20 - MAX_RT_PRIO; 250 data->nice = tsk->static_prio - 20 - MAX_RT_PRIO;
251 data->policy = tsk->policy; 251 data->policy = tsk->policy;
252 data->rt_priority = tsk->rt_priority; 252 data->rt_priority = tsk->rt_priority;
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index 8ebcd8532dfb..2dc06ab35716 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -27,6 +27,7 @@
27 */ 27 */
28void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk) 28void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
29{ 29{
30 const struct cred *tcred;
30 struct timespec uptime, ts; 31 struct timespec uptime, ts;
31 u64 ac_etime; 32 u64 ac_etime;
32 33
@@ -53,10 +54,11 @@ void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
53 stats->ac_flag |= AXSIG; 54 stats->ac_flag |= AXSIG;
54 stats->ac_nice = task_nice(tsk); 55 stats->ac_nice = task_nice(tsk);
55 stats->ac_sched = tsk->policy; 56 stats->ac_sched = tsk->policy;
56 stats->ac_uid = tsk->uid;
57 stats->ac_gid = tsk->gid;
58 stats->ac_pid = tsk->pid; 57 stats->ac_pid = tsk->pid;
59 rcu_read_lock(); 58 rcu_read_lock();
59 tcred = __task_cred(tsk);
60 stats->ac_uid = tcred->uid;
61 stats->ac_gid = tcred->gid;
60 stats->ac_ppid = pid_alive(tsk) ? 62 stats->ac_ppid = pid_alive(tsk) ?
61 rcu_dereference(tsk->real_parent)->tgid : 0; 63 rcu_dereference(tsk->real_parent)->tgid : 0;
62 rcu_read_unlock(); 64 rcu_read_unlock();
diff --git a/kernel/uid16.c b/kernel/uid16.c
index 3e41c1673e2f..2460c3199b5a 100644
--- a/kernel/uid16.c
+++ b/kernel/uid16.c
@@ -84,11 +84,12 @@ asmlinkage long sys_setresuid16(old_uid_t ruid, old_uid_t euid, old_uid_t suid)
84 84
85asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid) 85asmlinkage long sys_getresuid16(old_uid_t __user *ruid, old_uid_t __user *euid, old_uid_t __user *suid)
86{ 86{
87 const struct cred *cred = current_cred();
87 int retval; 88 int retval;
88 89
89 if (!(retval = put_user(high2lowuid(current->uid), ruid)) && 90 if (!(retval = put_user(high2lowuid(cred->uid), ruid)) &&
90 !(retval = put_user(high2lowuid(current->euid), euid))) 91 !(retval = put_user(high2lowuid(cred->euid), euid)))
91 retval = put_user(high2lowuid(current->suid), suid); 92 retval = put_user(high2lowuid(cred->suid), suid);
92 93
93 return retval; 94 return retval;
94} 95}
@@ -104,11 +105,12 @@ asmlinkage long sys_setresgid16(old_gid_t rgid, old_gid_t egid, old_gid_t sgid)
104 105
105asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid) 106asmlinkage long sys_getresgid16(old_gid_t __user *rgid, old_gid_t __user *egid, old_gid_t __user *sgid)
106{ 107{
108 const struct cred *cred = current_cred();
107 int retval; 109 int retval;
108 110
109 if (!(retval = put_user(high2lowgid(current->gid), rgid)) && 111 if (!(retval = put_user(high2lowgid(cred->gid), rgid)) &&
110 !(retval = put_user(high2lowgid(current->egid), egid))) 112 !(retval = put_user(high2lowgid(cred->egid), egid)))
111 retval = put_user(high2lowgid(current->sgid), sgid); 113 retval = put_user(high2lowgid(cred->sgid), sgid);
112 114
113 return retval; 115 return retval;
114} 116}
@@ -161,25 +163,24 @@ static int groups16_from_user(struct group_info *group_info,
161 163
162asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist) 164asmlinkage long sys_getgroups16(int gidsetsize, old_gid_t __user *grouplist)
163{ 165{
164 int i = 0; 166 const struct cred *cred = current_cred();
167 int i;
165 168
166 if (gidsetsize < 0) 169 if (gidsetsize < 0)
167 return -EINVAL; 170 return -EINVAL;
168 171
169 get_group_info(current->group_info); 172 i = cred->group_info->ngroups;
170 i = current->group_info->ngroups;
171 if (gidsetsize) { 173 if (gidsetsize) {
172 if (i > gidsetsize) { 174 if (i > gidsetsize) {
173 i = -EINVAL; 175 i = -EINVAL;
174 goto out; 176 goto out;
175 } 177 }
176 if (groups16_to_user(grouplist, current->group_info)) { 178 if (groups16_to_user(grouplist, cred->group_info)) {
177 i = -EFAULT; 179 i = -EFAULT;
178 goto out; 180 goto out;
179 } 181 }
180 } 182 }
181out: 183out:
182 put_group_info(current->group_info);
183 return i; 184 return i;
184} 185}
185 186
@@ -210,20 +211,20 @@ asmlinkage long sys_setgroups16(int gidsetsize, old_gid_t __user *grouplist)
210 211
211asmlinkage long sys_getuid16(void) 212asmlinkage long sys_getuid16(void)
212{ 213{
213 return high2lowuid(current->uid); 214 return high2lowuid(current_uid());
214} 215}
215 216
216asmlinkage long sys_geteuid16(void) 217asmlinkage long sys_geteuid16(void)
217{ 218{
218 return high2lowuid(current->euid); 219 return high2lowuid(current_euid());
219} 220}
220 221
221asmlinkage long sys_getgid16(void) 222asmlinkage long sys_getgid16(void)
222{ 223{
223 return high2lowgid(current->gid); 224 return high2lowgid(current_gid());
224} 225}
225 226
226asmlinkage long sys_getegid16(void) 227asmlinkage long sys_getegid16(void)
227{ 228{
228 return high2lowgid(current->egid); 229 return high2lowgid(current_egid());
229} 230}
diff --git a/kernel/user.c b/kernel/user.c
index 39d6159fae43..d476307dd4b0 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -16,6 +16,7 @@
16#include <linux/interrupt.h> 16#include <linux/interrupt.h>
17#include <linux/module.h> 17#include <linux/module.h>
18#include <linux/user_namespace.h> 18#include <linux/user_namespace.h>
19#include "cred-internals.h"
19 20
20struct user_namespace init_user_ns = { 21struct user_namespace init_user_ns = {
21 .kref = { 22 .kref = {
@@ -104,16 +105,10 @@ static int sched_create_user(struct user_struct *up)
104 return rc; 105 return rc;
105} 106}
106 107
107static void sched_switch_user(struct task_struct *p)
108{
109 sched_move_task(p);
110}
111
112#else /* CONFIG_USER_SCHED */ 108#else /* CONFIG_USER_SCHED */
113 109
114static void sched_destroy_user(struct user_struct *up) { } 110static void sched_destroy_user(struct user_struct *up) { }
115static int sched_create_user(struct user_struct *up) { return 0; } 111static int sched_create_user(struct user_struct *up) { return 0; }
116static void sched_switch_user(struct task_struct *p) { }
117 112
118#endif /* CONFIG_USER_SCHED */ 113#endif /* CONFIG_USER_SCHED */
119 114
@@ -448,36 +443,6 @@ out_unlock:
448 return NULL; 443 return NULL;
449} 444}
450 445
451void switch_uid(struct user_struct *new_user)
452{
453 struct user_struct *old_user;
454
455 /* What if a process setreuid()'s and this brings the
456 * new uid over his NPROC rlimit? We can check this now
457 * cheaply with the new uid cache, so if it matters
458 * we should be checking for it. -DaveM
459 */
460 old_user = current->user;
461 atomic_inc(&new_user->processes);
462 atomic_dec(&old_user->processes);
463 switch_uid_keyring(new_user);
464 current->user = new_user;
465 sched_switch_user(current);
466
467 /*
468 * We need to synchronize with __sigqueue_alloc()
469 * doing a get_uid(p->user).. If that saw the old
470 * user value, we need to wait until it has exited
471 * its critical region before we can free the old
472 * structure.
473 */
474 smp_mb();
475 spin_unlock_wait(&current->sighand->siglock);
476
477 free_uid(old_user);
478 suid_keys(current);
479}
480
481#ifdef CONFIG_USER_NS 446#ifdef CONFIG_USER_NS
482void release_uids(struct user_namespace *ns) 447void release_uids(struct user_namespace *ns)
483{ 448{
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 532858fa5b88..0d9c51d67333 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -19,6 +19,7 @@ static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
19{ 19{
20 struct user_namespace *ns; 20 struct user_namespace *ns;
21 struct user_struct *new_user; 21 struct user_struct *new_user;
22 struct cred *new;
22 int n; 23 int n;
23 24
24 ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL); 25 ns = kmalloc(sizeof(struct user_namespace), GFP_KERNEL);
@@ -38,14 +39,23 @@ static struct user_namespace *clone_user_ns(struct user_namespace *old_ns)
38 } 39 }
39 40
40 /* Reset current->user with a new one */ 41 /* Reset current->user with a new one */
41 new_user = alloc_uid(ns, current->uid); 42 new_user = alloc_uid(ns, current_uid());
42 if (!new_user) { 43 if (!new_user) {
43 free_uid(ns->root_user); 44 free_uid(ns->root_user);
44 kfree(ns); 45 kfree(ns);
45 return ERR_PTR(-ENOMEM); 46 return ERR_PTR(-ENOMEM);
46 } 47 }
47 48
48 switch_uid(new_user); 49 /* Install the new user */
50 new = prepare_creds();
51 if (!new) {
52 free_uid(new_user);
53 free_uid(ns->root_user);
54 kfree(ns);
55 }
56 free_uid(new->user);
57 new->user = new_user;
58 commit_creds(new);
49 return ns; 59 return ns;
50} 60}
51 61
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index d4dc69ddebd7..4952322cba45 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -84,21 +84,21 @@ static cpumask_t cpu_singlethread_map __read_mostly;
84static cpumask_t cpu_populated_map __read_mostly; 84static cpumask_t cpu_populated_map __read_mostly;
85 85
86/* If it's single threaded, it isn't in the list of workqueues. */ 86/* If it's single threaded, it isn't in the list of workqueues. */
87static inline int is_single_threaded(struct workqueue_struct *wq) 87static inline int is_wq_single_threaded(struct workqueue_struct *wq)
88{ 88{
89 return wq->singlethread; 89 return wq->singlethread;
90} 90}
91 91
92static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq) 92static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
93{ 93{
94 return is_single_threaded(wq) 94 return is_wq_single_threaded(wq)
95 ? &cpu_singlethread_map : &cpu_populated_map; 95 ? &cpu_singlethread_map : &cpu_populated_map;
96} 96}
97 97
98static 98static
99struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu) 99struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)
100{ 100{
101 if (unlikely(is_single_threaded(wq))) 101 if (unlikely(is_wq_single_threaded(wq)))
102 cpu = singlethread_cpu; 102 cpu = singlethread_cpu;
103 return per_cpu_ptr(wq->cpu_wq, cpu); 103 return per_cpu_ptr(wq->cpu_wq, cpu);
104} 104}
@@ -769,7 +769,7 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
769{ 769{
770 struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; 770 struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
771 struct workqueue_struct *wq = cwq->wq; 771 struct workqueue_struct *wq = cwq->wq;
772 const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d"; 772 const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";
773 struct task_struct *p; 773 struct task_struct *p;
774 774
775 p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu); 775 p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-12 22:12:35 -0500