litmus-rt.git - The LITMUS^RT kernel.

diff options

Diffstat (limited to 'arch/mips/kernel')

-rw-r--r--

arch/mips/kernel/linux32.c

-rw-r--r--

arch/mips/kernel/ptrace.c

-rw-r--r--

arch/mips/kernel/scall64-n32.S

-rw-r--r--

arch/mips/kernel/scall64-o32.S

-rw-r--r--

arch/mips/kernel/syscall.c

130

5 files changed, 2 insertions, 178 deletions


diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c index bde79ef602e6..a39d0597a375 100644 --- a/arch/mips/kernel/linux32.c +++ b/arch/mips/kernel/linux32.c
@@ -249,22 +249,6 @@ SYSCALL_DEFINE5(n32_msgrcv, int, msqid, u32, msgp, size_t, msgsz,
249	}	249	}
250	#endif	250	#endif
251		251
252	SYSCALL_DEFINE1(32_newuname, struct new_utsname __user *, name)
253	{
254	int ret = 0;
255
256	down_read(&uts_sem);
257	if (copy_to_user(name, utsname(), sizeof *name))
258	ret = -EFAULT;
259	up_read(&uts_sem);
260
261	if (current->personality == PER_LINUX32 && !ret)
262	if (copy_to_user(name->machine, "mips\0\0\0", 8))
263	ret = -EFAULT;
264
265	return ret;
266	}
267
268	SYSCALL_DEFINE1(32_personality, unsigned long, personality)	252	SYSCALL_DEFINE1(32_personality, unsigned long, personality)
269	{	253	{
270	int ret;	254	int ret;


diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index 054861ccb4dd..c51b95ff8644 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c
@@ -493,36 +493,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
493	ret = ptrace_setfpregs(child, (__u32 __user *) data);	493	ret = ptrace_setfpregs(child, (__u32 __user *) data);
494	break;	494	break;
495		495
496	case PTRACE_SYSCALL: /* continue and stop at next (return from) syscall */
497	case PTRACE_CONT: { /* restart after signal. */
498	ret = -EIO;
499	if (!valid_signal(data))
500	break;
501	if (request == PTRACE_SYSCALL) {
502	set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
503	}
504	else {
505	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
506	}
507	child->exit_code = data;
508	wake_up_process(child);
509	ret = 0;
510	break;
511	}
512
513	/*
514	* make the child exit. Best I can do is send it a sigkill.
515	* perhaps it should be put in the status that it wants to
516	* exit.
517	*/
518	case PTRACE_KILL:
519	ret = 0;
520	if (child->exit_state == EXIT_ZOMBIE) /* already dead */
521	break;
522	child->exit_code = SIGKILL;
523	wake_up_process(child);
524	break;
525
526	case PTRACE_GET_THREAD_AREA:	496	case PTRACE_GET_THREAD_AREA:
527	ret = put_user(task_thread_info(child)->tp_value,	497	ret = put_user(task_thread_info(child)->tp_value,
528	(unsigned long __user *) data);	498	(unsigned long __user *) data);


diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S index 66b5a48676dd..44337ba03717 100644 --- a/arch/mips/kernel/scall64-n32.S +++ b/arch/mips/kernel/scall64-n32.S
@@ -181,7 +181,7 @@ EXPORT(sysn32_call_table)
181	PTR sys_exit	181	PTR sys_exit
182	PTR compat_sys_wait4	182	PTR compat_sys_wait4
183	PTR sys_kill /* 6060 */	183	PTR sys_kill /* 6060 */
184	PTR sys_32_newuname	184	PTR sys_newuname
185	PTR sys_semget	185	PTR sys_semget
186	PTR sys_semop	186	PTR sys_semop
187	PTR sys_n32_semctl	187	PTR sys_n32_semctl


diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S index 515f9eab2b28..813689ef2384 100644 --- a/arch/mips/kernel/scall64-o32.S +++ b/arch/mips/kernel/scall64-o32.S
@@ -325,7 +325,7 @@ sys_call_table:
325	PTR sys32_sigreturn	325	PTR sys32_sigreturn
326	PTR sys32_clone /* 4120 */	326	PTR sys32_clone /* 4120 */
327	PTR sys_setdomainname	327	PTR sys_setdomainname
328	PTR sys_32_newuname	328	PTR sys_newuname
329	PTR sys_ni_syscall /* sys_modify_ldt */	329	PTR sys_ni_syscall /* sys_modify_ldt */
330	PTR compat_sys_adjtimex	330	PTR compat_sys_adjtimex
331	PTR sys_mprotect /* 4125 */	331	PTR sys_mprotect /* 4125 */


diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c index 3f7f466190b4..e96b1c30c7aa 100644 --- a/arch/mips/kernel/syscall.c +++ b/arch/mips/kernel/syscall.c
@@ -215,48 +215,6 @@ out:
215	return error;	215	return error;
216	}	216	}
217		217
218	/*
219	* Compacrapability ...
220	*/
221	SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
222	{
223	if (name && !copy_to_user(name, utsname(), sizeof (*name)))
224	return 0;
225	return -EFAULT;
226	}
227
228	/*
229	* Compacrapability ...
230	*/
231	SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
232	{
233	int error;
234
235	if (!name)
236	return -EFAULT;
237	if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
238	return -EFAULT;
239
240	error = __copy_to_user(&name->sysname, &utsname()->sysname,
241	__OLD_UTS_LEN);
242	error -= __put_user(0, name->sysname + __OLD_UTS_LEN);
243	error -= __copy_to_user(&name->nodename, &utsname()->nodename,
244	__OLD_UTS_LEN);
245	error -= __put_user(0, name->nodename + __OLD_UTS_LEN);
246	error -= __copy_to_user(&name->release, &utsname()->release,
247	__OLD_UTS_LEN);
248	error -= __put_user(0, name->release + __OLD_UTS_LEN);
249	error -= __copy_to_user(&name->version, &utsname()->version,
250	__OLD_UTS_LEN);
251	error -= __put_user(0, name->version + __OLD_UTS_LEN);
252	error -= __copy_to_user(&name->machine, &utsname()->machine,
253	__OLD_UTS_LEN);
254	error = __put_user(0, name->machine + __OLD_UTS_LEN);
255	error = error ? -EFAULT : 0;
256
257	return error;
258	}
259
260	SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)	218	SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
261	{	219	{
262	struct thread_info *ti = task_thread_info(current);	220	struct thread_info *ti = task_thread_info(current);
@@ -407,94 +365,6 @@ _sys_sysmips(nabi_no_regargs struct pt_regs regs)
407	}	365	}
408		366
409	/*	367	/*
410	* sys_ipc() is the de-multiplexer for the SysV IPC calls..
411	*
412	* This is really horribly ugly.
413	*/
414	SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, int, second,
415	unsigned long, third, void __user *, ptr, long, fifth)
416	{
417	int version, ret;
418
419	version = call >> 16; /* hack for backward compatibility */
420	call &= 0xffff;
421
422	switch (call) {
423	case SEMOP:
424	return sys_semtimedop(first, (struct sembuf __user *)ptr,
425	second, NULL);
426	case SEMTIMEDOP:
427	return sys_semtimedop(first, (struct sembuf __user *)ptr,
428	second,
429	(const struct timespec __user *)fifth);
430	case SEMGET:
431	return sys_semget(first, second, third);
432	case SEMCTL: {
433	union semun fourth;
434	if (!ptr)
435	return -EINVAL;
436	if (get_user(fourth.__pad, (void __user __user ) ptr))
437	return -EFAULT;
438	return sys_semctl(first, second, third, fourth);
439	}
440
441	case MSGSND:
442	return sys_msgsnd(first, (struct msgbuf __user *) ptr,
443	second, third);
444	case MSGRCV:
445	switch (version) {
446	case 0: {
447	struct ipc_kludge tmp;
448	if (!ptr)
449	return -EINVAL;
450
451	if (copy_from_user(&tmp,
452	(struct ipc_kludge __user *) ptr,
453	sizeof(tmp)))
454	return -EFAULT;
455	return sys_msgrcv(first, tmp.msgp, second,
456	tmp.msgtyp, third);
457	}
458	default:
459	return sys_msgrcv(first,
460	(struct msgbuf __user *) ptr,
461	second, fifth, third);
462	}
463	case MSGGET:
464	return sys_msgget((key_t) first, second);
465	case MSGCTL:
466	return sys_msgctl(first, second,
467	(struct msqid_ds __user *) ptr);
468
469	case SHMAT:
470	switch (version) {
471	default: {
472	unsigned long raddr;
473	ret = do_shmat(first, (char __user *) ptr, second,
474	&raddr);
475	if (ret)
476	return ret;
477	return put_user(raddr, (unsigned long __user *) third);
478	}
479	case 1: /* iBCS2 emulator entry point */
480	if (!segment_eq(get_fs(), get_ds()))
481	return -EINVAL;
482	return do_shmat(first, (char __user *) ptr, second,
483	(unsigned long *) third);
484	}
485	case SHMDT:
486	return sys_shmdt((char __user *)ptr);
487	case SHMGET:
488	return sys_shmget(first, second, third);
489	case SHMCTL:
490	return sys_shmctl(first, second,
491	(struct shmid_ds __user *) ptr);
492	default:
493	return -ENOSYS;
494	}
495	}
496
497	/*
498	* No implemented yet ...	368	* No implemented yet ...
499	*/	369	*/
500	SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)	370	SYSCALL_DEFINE3(cachectl, char *, addr, int, nbytes, int, op)

/* * linux/fs/proc/base.c * * Copyright (C) 1991, 1992 Linus Torvalds * * proc base directory handling functions * * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. * Instead of using magical inumbers to determine the kind of object * we allocate and fill in-core inodes upon lookup. They don't even * go into icache. We cache the reference to task_struct upon lookup too. * Eventually it should become a filesystem in its own. We don't use the * rest of procfs anymore. * * * Changelog: * 17-Jan-2005 * Allan Bezerra * Bruna Moreira <bruna.moreira@indt.org.br> * Edjard Mota <edjard.mota@indt.org.br> * Ilias Biris <ilias.biris@indt.org.br> * Mauricio Lin <mauricio.lin@indt.org.br> * * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT * * A new process specific entry (smaps) included in /proc. It shows the * size of rss for each memory area. The maps entry lacks information * about physical memory size (rss) for each mapped file, i.e., * rss information for executables and library files. * This additional information is useful for any tools that need to know * about physical memory consumption for a process specific library. * * Changelog: * 21-Feb-2005 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT * Pud inclusion in the page table walking. * * ChangeLog: * 10-Mar-2005 * 10LE Instituto Nokia de Tecnologia - INdT: * A better way to walks through the page table as suggested by Hugh Dickins. * * Simo Piiroinen <simo.piiroinen@nokia.com>: * Smaps information related to shared, private, clean and dirty pages. * * Paul Mundt <paul.mundt@nokia.com>: * Overall revision about smaps. */ #include <asm/uaccess.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/task_io_accounting_ops.h> #include <linux/init.h> #include <linux/capability.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/string.h> #include <linux/seq_file.h> #include <linux/namei.h> #include <linux/mnt_namespace.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/rcupdate.h> #include <linux/kallsyms.h> #include <linux/stacktrace.h> #include <linux/resource.h> #include <linux/module.h> #include <linux/mount.h> #include <linux/security.h> #include <linux/ptrace.h> #include <linux/tracehook.h> #include <linux/printk.h> #include <linux/cgroup.h> #include <linux/cpuset.h> #include <linux/audit.h> #include <linux/poll.h> #include <linux/nsproxy.h> #include <linux/oom.h> #include <linux/elf.h> #include <linux/pid_namespace.h> #include <linux/user_namespace.h> #include <linux/fs_struct.h> #include <linux/slab.h> #include <linux/flex_array.h> #include <linux/posix-timers.h> #ifdef CONFIG_HARDWALL #include <asm/hardwall.h> #endif #include <trace/events/oom.h> #include "internal.h" #include "fd.h" /* NOTE: * Implementing inode permission operations in /proc is almost * certainly an error. Permission checks need to happen during * each system call not at open time. The reason is that most of * what we wish to check for permissions in /proc varies at runtime. * * The classic example of a problem is opening file descriptors * in /proc for a task before it execs a suid executable. */ struct pid_entry { const char *name; int len; umode_t mode; const struct inode_operations *iop; const struct file_operations *fop; union proc_op op; }; #define NOD(NAME, MODE, IOP, FOP, OP) { \ .name = (NAME), \ .len = sizeof(NAME) - 1, \ .mode = MODE, \ .iop = IOP, \ .fop = FOP, \ .op = OP, \ } #define DIR(NAME, MODE, iops, fops) \ NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) #define LNK(NAME, get_link) \ NOD(NAME, (S_IFLNK|S_IRWXUGO), \ &proc_pid_link_inode_operations, NULL, \ { .proc_get_link = get_link } ) #define REG(NAME, MODE, fops) \ NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) #define ONE(NAME, MODE, show) \ NOD(NAME, (S_IFREG|(MODE)), \ NULL, &proc_single_file_operations, \ { .proc_show = show } ) /* * Count the number of hardlinks for the pid_entry table, excluding the . * and .. links. */ static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, unsigned int n) { unsigned int i; unsigned int count; count = 0; for (i = 0; i < n; ++i) { if (S_ISDIR(entries[i].mode)) ++count; } return count; } static int get_task_root(struct task_struct *task, struct path *root) { int result = -ENOENT; task_lock(task); if (task->fs) { get_fs_root(task->fs, root); result = 0; } task_unlock(task); return result; } static int proc_cwd_link(struct dentry *dentry, struct path *path) { struct task_struct *task = get_proc_task(dentry->d_inode); int result = -ENOENT; if (task) { task_lock(task); if (task->fs) { get_fs_pwd(task->fs, path); result = 0; } task_unlock(task); put_task_struct(task); } return result; } static int proc_root_link(struct dentry *dentry, struct path *path) { struct task_struct *task = get_proc_task(dentry->d_inode); int result = -ENOENT; if (task) { result = get_task_root(task, path); put_task_struct(task); } return result; } static int proc_pid_cmdline(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { /* * Rely on struct seq_operations::show() being called once * per internal buffer allocation. See single_open(), traverse(). */ BUG_ON(m->size < PAGE_SIZE); m->count += get_cmdline(task, m->buf, PAGE_SIZE); return 0; } static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ); if (mm && !IS_ERR(mm)) { unsigned int nwords = 0; do { nwords += 2; } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0])); mmput(mm); return 0; } else return PTR_ERR(mm); } #ifdef CONFIG_KALLSYMS /* * Provides a wchan file via kallsyms in a proper one-value-per-file format. * Returns the resolved symbol. If that fails, simply return the address. */ static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { unsigned long wchan; char symname[KSYM_NAME_LEN]; wchan = get_wchan(task); if (lookup_symbol_name(wchan, symname) < 0) if (!ptrace_may_access(task, PTRACE_MODE_READ)) return 0; else return seq_printf(m, "%lu", wchan); else return seq_printf(m, "%s", symname); } #endif /* CONFIG_KALLSYMS */ static int lock_trace(struct task_struct *task) { int err = mutex_lock_killable(&task->signal->cred_guard_mutex); if (err) return err; if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { mutex_unlock(&task->signal->cred_guard_mutex); return -EPERM; } return 0; } static void unlock_trace(struct task_struct *task) { mutex_unlock(&task->signal->cred_guard_mutex); } #ifdef CONFIG_STACKTRACE #define MAX_STACK_TRACE_DEPTH 64 static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { struct stack_trace trace; unsigned long *entries; int err; int i; entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); if (!entries) return -ENOMEM; trace.nr_entries = 0; trace.max_entries = MAX_STACK_TRACE_DEPTH; trace.entries = entries; trace.skip = 0; err = lock_trace(task); if (!err) { save_stack_trace_tsk(task, &trace); for (i = 0; i < trace.nr_entries; i++) { seq_printf(m, "[<%pK>] %pS\n", (void *)entries[i], (void *)entries[i]); } unlock_trace(task); } kfree(entries); return err; } #endif #ifdef CONFIG_SCHEDSTATS /* * Provides /proc/PID/schedstat */ static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { return seq_printf(m, "%llu %llu %lu\n", (unsigned long long)task->se.sum_exec_runtime, (unsigned long long)task->sched_info.run_delay, task->sched_info.pcount); } #endif #ifdef CONFIG_LATENCYTOP static int lstats_show_proc(struct seq_file *m, void *v) { int i; struct inode *inode = m->private; struct task_struct *task = get_proc_task(inode); if (!task) return -ESRCH; seq_puts(m, "Latency Top version : v0.1\n"); for (i = 0; i < 32; i++) { struct latency_record *lr = &task->latency_record[i]; if (lr->backtrace[0]) { int q; seq_printf(m, "%i %li %li", lr->count, lr->time, lr->max); for (q = 0; q < LT_BACKTRACEDEPTH; q++) { unsigned long bt = lr->backtrace[q]; if (!bt) break; if (bt == ULONG_MAX) break; seq_printf(m, " %ps", (void *)bt); } seq_putc(m, '\n'); } } put_task_struct(task); return 0; } static int lstats_open(struct inode *inode, struct file *file) { return single_open(file, lstats_show_proc, inode); } static ssize_t lstats_write(struct file *file, const char __user *buf, size_t count, loff_t *offs) { struct task_struct *task = get_proc_task(file_inode(file)); if (!task) return -ESRCH; clear_all_latency_tracing(task); put_task_struct(task); return count; } static const struct file_operations proc_lstats_operations = { .open = lstats_open, .read = seq_read, .write = lstats_write, .llseek = seq_lseek, .release = single_release, }; #endif #ifdef CONFIG_CGROUPS static int cgroup_open(struct inode *inode, struct file *file) { struct pid *pid = PROC_I(inode)->pid; return single_open(file, proc_cgroup_show, pid); } static const struct file_operations proc_cgroup_operations = { .open = cgroup_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; #endif #ifdef CONFIG_PROC_PID_CPUSET static int cpuset_open(struct inode *inode, struct file *file) { struct pid *pid = PROC_I(inode)->pid; return single_open(file, proc_cpuset_show, pid); } static const struct file_operations proc_cpuset_operations = { .open = cpuset_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; #endif static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { unsigned long totalpages = totalram_pages + total_swap_pages; unsigned long points = 0; read_lock(&tasklist_lock); if (pid_alive(task)) points = oom_badness(task, NULL, NULL, totalpages) * 1000 / totalpages; read_unlock(&tasklist_lock); return seq_printf(m, "%lu\n", points); } struct limit_names { const char *name; const char *unit; }; static const struct limit_names lnames[RLIM_NLIMITS] = { [RLIMIT_CPU] = {"Max cpu time", "seconds"}, [RLIMIT_FSIZE] = {"Max file size", "bytes"}, [RLIMIT_DATA] = {"Max data size", "bytes"}, [RLIMIT_STACK] = {"Max stack size", "bytes"}, [RLIMIT_CORE] = {"Max core file size", "bytes"}, [RLIMIT_RSS] = {"Max resident set", "bytes"}, [RLIMIT_NPROC] = {"Max processes", "processes"}, [RLIMIT_NOFILE] = {"Max open files", "files"}, [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, [RLIMIT_AS] = {"Max address space", "bytes"}, [RLIMIT_LOCKS] = {"Max file locks", "locks"}, [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, [RLIMIT_NICE] = {"Max nice priority", NULL}, [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, }; /* Display limits for a process */ static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { unsigned int i; unsigned long flags; struct rlimit rlim[RLIM_NLIMITS]; if (!lock_task_sighand(task, &flags)) return 0; memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); unlock_task_sighand(task, &flags); /* * print the file header */ seq_printf(m, "%-25s %-20s %-20s %-10s\n", "Limit", "Soft Limit", "Hard Limit", "Units"); for (i = 0; i < RLIM_NLIMITS; i++) { if (rlim[i].rlim_cur == RLIM_INFINITY) seq_printf(m, "%-25s %-20s ", lnames[i].name, "unlimited"); else seq_printf(m, "%-25s %-20lu ", lnames[i].name, rlim[i].rlim_cur); if (rlim[i].rlim_max == RLIM_INFINITY) seq_printf(m, "%-20s ", "unlimited"); else seq_printf(m, "%-20lu ", rlim[i].rlim_max); if (lnames[i].unit) seq_printf(m, "%-10s\n", lnames[i].unit); else seq_putc(m, '\n'); } return 0; } #ifdef CONFIG_HAVE_ARCH_TRACEHOOK static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { long nr; unsigned long args[6], sp, pc; int res = lock_trace(task); if (res) return res; if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) seq_puts(m, "running\n"); else if (nr < 0) seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); else seq_printf(m, "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", nr, args[0], args[1], args[2], args[3], args[4], args[5], sp, pc); unlock_trace(task); return res; } #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ /************************************************************************/ /* Here the fs part begins */ /************************************************************************/ /* permission checks */ static int proc_fd_access_allowed(struct inode *inode) { struct task_struct *task; int allowed = 0; /* Allow access to a task's file descriptors if it is us or we * may use ptrace attach to the process and find out that * information. */ task = get_proc_task(inode); if (task) { allowed = ptrace_may_access(task, PTRACE_MODE_READ); put_task_struct(task); } return allowed; } int proc_setattr(struct dentry *dentry, struct iattr *attr) { int error; struct inode *inode = dentry->d_inode; if (attr->ia_valid & ATTR_MODE) return -EPERM; error = inode_change_ok(inode, attr); if (error) return error; setattr_copy(inode, attr); mark_inode_dirty(inode); return 0; } /* * May current process learn task's sched/cmdline info (for hide_pid_min=1) * or euid/egid (for hide_pid_min=2)? */ static bool has_pid_permissions(struct pid_namespace *pid, struct task_struct *task, int hide_pid_min) { if (pid->hide_pid < hide_pid_min) return true; if (in_group_p(pid->pid_gid)) return true; return ptrace_may_access(task, PTRACE_MODE_READ); } static int proc_pid_permission(struct inode *inode, int mask) { struct pid_namespace *pid = inode->i_sb->s_fs_info; struct task_struct *task; bool has_perms; task = get_proc_task(inode); if (!task) return -ESRCH; has_perms = has_pid_permissions(pid, task, 1); put_task_struct(task); if (!has_perms) { if (pid->hide_pid == 2) { /* * Let's make getdents(), stat(), and open() * consistent with each other. If a process * may not stat() a file, it shouldn't be seen * in procfs at all. */ return -ENOENT; } return -EPERM; } return generic_permission(inode, mask); } static const struct inode_operations proc_def_inode_operations = { .setattr = proc_setattr, }; static int proc_single_show(struct seq_file *m, void *v) { struct inode *inode = m->private; struct pid_namespace *ns; struct pid *pid; struct task_struct *task; int ret; ns = inode->i_sb->s_fs_info; pid = proc_pid(inode); task = get_pid_task(pid, PIDTYPE_PID); if (!task) return -ESRCH; ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); put_task_struct(task); return ret; } static int proc_single_open(struct inode *inode, struct file *filp) { return single_open(filp, proc_single_show, inode); } static const struct file_operations proc_single_file_operations = { .open = proc_single_open, .read = seq_read, .llseek = seq_lseek, .release = single_release, }; static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) { struct task_struct *task = get_proc_task(file_inode(file)); struct mm_struct *mm; if (!task) return -ESRCH; mm = mm_access(task, mode); put_task_struct(task); if (IS_ERR(mm)) return PTR_ERR(mm); if (mm) { /* ensure this mm_struct can't be freed */ atomic_inc(&mm->mm_count); /* but do not pin its memory */ mmput(mm); } file->private_data = mm; return 0; } static int mem_open(struct inode *inode, struct file *file) { int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); /* OK to pass negative loff_t, we can catch out-of-range */ file->f_mode |= FMODE_UNSIGNED_OFFSET; return ret; } static ssize_t mem_rw(struct file *file, char __user *buf, size_t count, loff_t *ppos, int write) { struct mm_struct *mm = file->private_data; unsigned long addr = *ppos; ssize_t copied; char *page; if (!mm) return 0; page = (char *)__get_free_page(GFP_TEMPORARY); if (!page) return -ENOMEM; copied = 0; if (!atomic_inc_not_zero(&mm->mm_users)) goto free; while (count > 0) { int this_len = min_t(int, count, PAGE_SIZE); if (write && copy_from_user(page, buf, this_len)) { copied = -EFAULT; break; } this_len = access_remote_vm(mm, addr, page, this_len, write); if (!this_len) { if (!copied) copied = -EIO; break; } if (!write && copy_to_user(buf, page, this_len)) { copied = -EFAULT; break; } buf += this_len; addr += this_len; copied += this_len; count -= this_len; } *ppos = addr; mmput(mm); free: free_page((unsigned long) page); return copied; } static ssize_t mem_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { return mem_rw(file, buf, count, ppos, 0); } static ssize_t mem_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { return mem_rw(file, (char __user*)buf, count, ppos, 1); } loff_t mem_lseek(struct file *file, loff_t offset, int orig) { switch (orig) { case 0: file->f_pos = offset; break; case 1: file->f_pos += offset; break; default: return -EINVAL; } force_successful_syscall_return(); return file->f_pos; } static int mem_release(struct inode *inode, struct file *file) { struct mm_struct *mm = file->private_data; if (mm) mmdrop(mm); return 0; } static const struct file_operations proc_mem_operations = { .llseek = mem_lseek, .read = mem_read, .write = mem_write, .open = mem_open, .release = mem_release, }; static int environ_open(struct inode *inode, struct file *file) { return __mem_open(inode, file, PTRACE_MODE_READ); } static ssize_t environ_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { char *page; unsigned long src = *ppos; int ret = 0; struct mm_struct *mm = file->private_data; if (!mm) return 0; page = (char *)__get_free_page(GFP_TEMPORARY); if (!page) return -ENOMEM; ret = 0; if (!atomic_inc_not_zero(&mm->mm_users)) goto free; while (count > 0) { size_t this_len, max_len; int retval; if (src >= (mm->env_end - mm->env_start)) break; this_len = mm->env_end - (mm->env_start + src); max_len = min_t(size_t, PAGE_SIZE, count); this_len = min(max_len, this_len); retval = access_remote_vm(mm, (mm->env_start + src), page, this_len, 0); if (retval <= 0) { ret = retval; break; } if (copy_to_user(buf, page, retval)) { ret = -EFAULT; break; } ret += retval; src += retval; buf += retval; count -= retval; } *ppos = src; mmput(mm); free: free_page((unsigned long) page); return ret; } static const struct file_operations proc_environ_operations = { .open = environ_open, .read = environ_read, .llseek = generic_file_llseek, .release = mem_release, }; static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; int oom_adj = OOM_ADJUST_MIN; size_t len; unsigned long flags; if (!task) return -ESRCH; if (lock_task_sighand(task, &flags)) { if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) oom_adj = OOM_ADJUST_MAX; else oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / OOM_SCORE_ADJ_MAX; unlock_task_sighand(task, &flags); } put_task_struct(task); len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); return simple_read_from_buffer(buf, count, ppos, buffer, len); } static ssize_t oom_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task; char buffer[PROC_NUMBUF]; int oom_adj; unsigned long flags; int err; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) { err = -EFAULT; goto out; } err = kstrtoint(strstrip(buffer), 0, &oom_adj); if (err) goto out; if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && oom_adj != OOM_DISABLE) { err = -EINVAL; goto out; } task = get_proc_task(file_inode(file)); if (!task) { err = -ESRCH; goto out; } task_lock(task); if (!task->mm) { err = -EINVAL; goto err_task_lock; } if (!lock_task_sighand(task, &flags)) { err = -ESRCH; goto err_task_lock; } /* * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum * value is always attainable. */ if (oom_adj == OOM_ADJUST_MAX) oom_adj = OOM_SCORE_ADJ_MAX; else oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; if (oom_adj < task->signal->oom_score_adj && !capable(CAP_SYS_RESOURCE)) { err = -EACCES; goto err_sighand; } /* * /proc/pid/oom_adj is provided for legacy purposes, ask users to use * /proc/pid/oom_score_adj instead. */ pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", current->comm, task_pid_nr(current), task_pid_nr(task), task_pid_nr(task)); task->signal->oom_score_adj = oom_adj; trace_oom_score_adj_update(task); err_sighand: unlock_task_sighand(task, &flags); err_task_lock: task_unlock(task); put_task_struct(task); out: return err < 0 ? err : count; } static const struct file_operations proc_oom_adj_operations = { .read = oom_adj_read, .write = oom_adj_write, .llseek = generic_file_llseek, }; static ssize_t oom_score_adj_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; short oom_score_adj = OOM_SCORE_ADJ_MIN; unsigned long flags; size_t len; if (!task) return -ESRCH; if (lock_task_sighand(task, &flags)) { oom_score_adj = task->signal->oom_score_adj; unlock_task_sighand(task, &flags); } put_task_struct(task); len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); return simple_read_from_buffer(buf, count, ppos, buffer, len); } static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task; char buffer[PROC_NUMBUF]; unsigned long flags; int oom_score_adj; int err; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) { err = -EFAULT; goto out; } err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); if (err) goto out; if (oom_score_adj < OOM_SCORE_ADJ_MIN || oom_score_adj > OOM_SCORE_ADJ_MAX) { err = -EINVAL; goto out; } task = get_proc_task(file_inode(file)); if (!task) { err = -ESRCH; goto out; } task_lock(task); if (!task->mm) { err = -EINVAL; goto err_task_lock; } if (!lock_task_sighand(task, &flags)) { err = -ESRCH; goto err_task_lock; } if ((short)oom_score_adj < task->signal->oom_score_adj_min && !capable(CAP_SYS_RESOURCE)) { err = -EACCES; goto err_sighand; } task->signal->oom_score_adj = (short)oom_score_adj; if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) task->signal->oom_score_adj_min = (short)oom_score_adj; trace_oom_score_adj_update(task); err_sighand: unlock_task_sighand(task, &flags); err_task_lock: task_unlock(task); put_task_struct(task); out: return err < 0 ? err : count; } static const struct file_operations proc_oom_score_adj_operations = { .read = oom_score_adj_read, .write = oom_score_adj_write, .llseek = default_llseek, }; #ifdef CONFIG_AUDITSYSCALL #define TMPBUFLEN 21 static ssize_t proc_loginuid_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); struct task_struct *task = get_proc_task(inode); ssize_t length; char tmpbuf[TMPBUFLEN]; if (!task) return -ESRCH; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", from_kuid(file->f_cred->user_ns, audit_get_loginuid(task))); put_task_struct(task); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); char *page, *tmp; ssize_t length; uid_t loginuid; kuid_t kloginuid; rcu_read_lock(); if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { rcu_read_unlock(); return -EPERM; } rcu_read_unlock(); if (count >= PAGE_SIZE) count = PAGE_SIZE - 1; if (*ppos != 0) { /* No partial writes. */ return -EINVAL; } page = (char*)__get_free_page(GFP_TEMPORARY); if (!page) return -ENOMEM; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out_free_page; page[count] = '\0'; loginuid = simple_strtoul(page, &tmp, 10); if (tmp == page) { length = -EINVAL; goto out_free_page; } /* is userspace tring to explicitly UNSET the loginuid? */ if (loginuid == AUDIT_UID_UNSET) { kloginuid = INVALID_UID; } else { kloginuid = make_kuid(file->f_cred->user_ns, loginuid); if (!uid_valid(kloginuid)) { length = -EINVAL; goto out_free_page; } } length = audit_set_loginuid(kloginuid); if (likely(length == 0)) length = count; out_free_page: free_page((unsigned long) page); return length; } static const struct file_operations proc_loginuid_operations = { .read = proc_loginuid_read, .write = proc_loginuid_write, .llseek = generic_file_llseek, }; static ssize_t proc_sessionid_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); struct task_struct *task = get_proc_task(inode); ssize_t length; char tmpbuf[TMPBUFLEN]; if (!task) return -ESRCH; length = scnprintf(tmpbuf, TMPBUFLEN, "%u", audit_get_sessionid(task)); put_task_struct(task); return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); } static const struct file_operations proc_sessionid_operations = { .read = proc_sessionid_read, .llseek = generic_file_llseek, }; #endif #ifdef CONFIG_FAULT_INJECTION static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { struct task_struct *task = get_proc_task(file_inode(file)); char buffer[PROC_NUMBUF]; size_t len; int make_it_fail; if (!task) return -ESRCH; make_it_fail = task->make_it_fail; put_task_struct(task); len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); return simple_read_from_buffer(buf, count, ppos, buffer, len); } static ssize_t proc_fault_inject_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { struct task_struct *task; char buffer[PROC_NUMBUF], *end; int make_it_fail; if (!capable(CAP_SYS_RESOURCE)) return -EPERM; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; make_it_fail = simple_strtol(strstrip(buffer), &end, 0); if (*end) return -EINVAL; if (make_it_fail < 0 || make_it_fail > 1) return -EINVAL; task = get_proc_task(file_inode(file)); if (!task) return -ESRCH; task->make_it_fail = make_it_fail; put_task_struct(task); return count; } static const struct file_operations proc_fault_inject_operations = { .read = proc_fault_inject_read, .write = proc_fault_inject_write, .llseek = generic_file_llseek, }; #endif #ifdef CONFIG_SCHED_DEBUG /* * Print out various scheduling related per-task fields: */ static int sched_show(struct seq_file *m, void *v) { struct inode *inode = m->private; struct task_struct *p; p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_show_task(p, m); put_task_struct(p); return 0; } static ssize_t sched_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { struct inode *inode = file_inode(file); struct task_struct *p; p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_set_task(p); put_task_struct(p); return count; } static int sched_open(struct inode *inode, struct file *filp) { return single_open(filp, sched_show, inode); } static const struct file_operations proc_pid_sched_operations = { .open = sched_open, .read = seq_read, .write = sched_write, .llseek = seq_lseek, .release = single_release, }; #endif #ifdef CONFIG_SCHED_AUTOGROUP /* * Print out autogroup related information: */ static int sched_autogroup_show(struct seq_file *m, void *v) { struct inode *inode = m->private; struct task_struct *p; p = get_proc_task(inode); if (!p) return -ESRCH; proc_sched_autogroup_show_task(p, m); put_task_struct(p); return 0; } static ssize_t sched_autogroup_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { struct inode *inode = file_inode(file); struct task_struct *p; char buffer[PROC_NUMBUF]; int nice; int err; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) return -EFAULT; err = kstrtoint(strstrip(buffer), 0, &nice); if (err < 0) return err; p = get_proc_task(inode); if (!p) return -ESRCH; err = proc_sched_autogroup_set_nice(p, nice); if (err) count = err; put_task_struct(p); return count; } static int sched_autogroup_open(struct inode *inode, struct file *filp) { int ret; ret = single_open(filp, sched_autogroup_show, NULL); if (!ret) { struct seq_file *m = filp->private_data; m->private = inode; } return ret; } static const struct file_operations proc_pid_sched_autogroup_operations = { .open = sched_autogroup_open, .read = seq_read, .write = sched_autogroup_write, .llseek = seq_lseek, .release = single_release, }; #endif /* CONFIG_SCHED_AUTOGROUP */ static ssize_t comm_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { struct inode *inode = file_inode(file); struct task_struct *p; char buffer[TASK_COMM_LEN]; const size_t maxlen = sizeof(buffer) - 1; memset(buffer, 0, sizeof(buffer)); if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) return -EFAULT; p = get_proc_task(inode); if (!p) return -ESRCH; if (same_thread_group(current, p)) set_task_comm(p, buffer); else count = -EINVAL; put_task_struct(p); return count; } static int comm_show(struct seq_file *m, void *v) { struct inode *inode = m->private; struct task_struct *p; p = get_proc_task(inode); if (!p) return -ESRCH; task_lock(p); seq_printf(m, "%s\n", p->comm); task_unlock(p); put_task_struct(p); return 0; } static int comm_open(struct inode *inode, struct file *filp) { return single_open(filp, comm_show, inode); } static const struct file_operations proc_pid_set_comm_operations = { .open = comm_open, .read = seq_read, .write = comm_write, .llseek = seq_lseek, .release = single_release, }; static int proc_exe_link(struct dentry *dentry, struct path *exe_path) { struct task_struct *task; struct mm_struct *mm; struct file *exe_file; task = get_proc_task(dentry->d_inode); if (!task) return -ENOENT; mm = get_task_mm(task); put_task_struct(task); if (!mm) return -ENOENT; exe_file = get_mm_exe_file(mm); mmput(mm); if (exe_file) { *exe_path = exe_file->f_path; path_get(&exe_file->f_path); fput(exe_file); return 0; } else return -ENOENT; } static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) { struct inode *inode = dentry->d_inode; struct path path; int error = -EACCES; /* Are we allowed to snoop on the tasks file descriptors? */ if (!proc_fd_access_allowed(inode)) goto out; error = PROC_I(inode)->op.proc_get_link(dentry, &path); if (error) goto out; nd_jump_link(nd, &path); return NULL; out: return ERR_PTR(error); } static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) { char *tmp = (char*)__get_free_page(GFP_TEMPORARY); char *pathname; int len; if (!tmp) return -ENOMEM; pathname = d_path(path, tmp, PAGE_SIZE); len = PTR_ERR(pathname); if (IS_ERR(pathname)) goto out; len = tmp + PAGE_SIZE - 1 - pathname; if (len > buflen) len = buflen; if (copy_to_user(buffer, pathname, len)) len = -EFAULT; out: free_page((unsigned long)tmp); return len; } static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) { int error = -EACCES; struct inode *inode = dentry->d_inode; struct path path; /* Are we allowed to snoop on the tasks file descriptors? */ if (!proc_fd_access_allowed(inode)) goto out; error = PROC_I(inode)->op.proc_get_link(dentry, &path); if (error) goto out; error = do_proc_readlink(&path, buffer, buflen); path_put(&path); out: return error; } const struct inode_operations proc_pid_link_inode_operations = { .readlink = proc_pid_readlink, .follow_link = proc_pid_follow_link, .setattr = proc_setattr, }; /* building an inode */ struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) { struct inode * inode; struct proc_inode *ei; const struct cred *cred; /* We need a new inode */ inode = new_inode(sb); if (!inode) goto out; /* Common stuff */ ei = PROC_I(inode); inode->i_ino = get_next_ino(); inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; inode->i_op = &proc_def_inode_operations; /* * grab the reference to task. */ ei->pid = get_task_pid(task, PIDTYPE_PID); if (!ei->pid) goto out_unlock; if (task_dumpable(task)) { rcu_read_lock(); cred = __task_cred(task); inode->i_uid = cred->euid; inode->i_gid = cred->egid; rcu_read_unlock(); } security_task_to_inode(task, inode); out: return inode; out_unlock: iput(inode); return NULL; } int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; struct task_struct *task; const struct cred *cred; struct pid_namespace *pid = dentry->d_sb->s_fs_info; generic_fillattr(inode, stat); rcu_read_lock(); stat->uid = GLOBAL_ROOT_UID; stat->gid = GLOBAL_ROOT_GID; task = pid_task(proc_pid(inode), PIDTYPE_PID); if (task) { if (!has_pid_permissions(pid, task, 2)) { rcu_read_unlock(); /* * This doesn't prevent learning whether PID exists, * it only makes getattr() consistent with readdir(). */ return -ENOENT; } if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || task_dumpable(task)) { cred = __task_cred(task); stat->uid = cred->euid; stat->gid = cred->egid; } } rcu_read_unlock(); return 0; } /* dentry stuff */ /* * Exceptional case: normally we are not allowed to unhash a busy * directory. In this case, however, we can do it - no aliasing problems * due to the way we treat inodes. * * Rewrite the inode's ownerships here because the owning task may have * performed a setuid(), etc. * * Before the /proc/pid/status file was created the only way to read * the effective uid of a /process was to stat /proc/pid. Reading * /proc/pid/status is slow enough that procps and other packages * kept stating /proc/pid. To keep the rules in /proc simple I have * made this apply to all per process world readable and executable * directories. */ int pid_revalidate(struct dentry *dentry, unsigned int flags) { struct inode *inode; struct task_struct *task; const struct cred *cred; if (flags & LOOKUP_RCU) return -ECHILD; inode = dentry->d_inode; task = get_proc_task(inode); if (task) { if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || task_dumpable(task)) { rcu_read_lock(); cred = __task_cred(task); inode->i_uid = cred->euid; inode->i_gid = cred->egid; rcu_read_unlock(); } else { inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; } inode->i_mode &= ~(S_ISUID | S_ISGID); security_task_to_inode(task, inode); put_task_struct(task); return 1; } d_drop(dentry); return 0; } static inline bool proc_inode_is_dead(struct inode *inode) { return !proc_pid(inode)->tasks[PIDTYPE_PID].first; } int pid_delete_dentry(const struct dentry *dentry) { /* Is the task we represent dead? * If so, then don't put the dentry on the lru list, * kill it immediately. */ return proc_inode_is_dead(dentry->d_inode); } const struct dentry_operations pid_dentry_operations = { .d_revalidate = pid_revalidate, .d_delete = pid_delete_dentry, }; /* Lookups */ /* * Fill a directory entry. * * If possible create the dcache entry and derive our inode number and * file type from dcache entry. * * Since all of the proc inode numbers are dynamically generated, the inode * numbers do not exist until the inode is cache. This means creating the * the dcache entry in readdir is necessary to keep the inode numbers * reported by readdir in sync with the inode numbers reported * by stat. */ bool proc_fill_cache(struct file *file, struct dir_context *ctx, const char *name, int len, instantiate_t instantiate, struct task_struct *task, const void *ptr) { struct dentry *child, *dir = file->f_path.dentry; struct qstr qname = QSTR_INIT(name, len); struct inode *inode; unsigned type; ino_t ino; child = d_hash_and_lookup(dir, &qname); if (!child) { child = d_alloc(dir, &qname); if (!child) goto end_instantiate; if (instantiate(dir->d_inode, child, task, ptr) < 0) { dput(child); goto end_instantiate; } } inode = child->d_inode; ino = inode->i_ino; type = inode->i_mode >> 12; dput(child); return dir_emit(ctx, name, len, ino, type); end_instantiate: return dir_emit(ctx, name, len, 1, DT_UNKNOWN); } #ifdef CONFIG_CHECKPOINT_RESTORE /* * dname_to_vma_addr - maps a dentry name into two unsigned longs * which represent vma start and end addresses. */ static int dname_to_vma_addr(struct dentry *dentry, unsigned long *start, unsigned long *end) { if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) return -EINVAL; return 0; } static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) { unsigned long vm_start, vm_end; bool exact_vma_exists = false; struct mm_struct *mm = NULL; struct task_struct *task; const struct cred *cred; struct inode *inode; int status = 0; if (flags & LOOKUP_RCU) return -ECHILD; if (!capable(CAP_SYS_ADMIN)) { status = -EPERM; goto out_notask; } inode = dentry->d_inode; task = get_proc_task(inode); if (!task) goto out_notask; mm = mm_access(task, PTRACE_MODE_READ); if (IS_ERR_OR_NULL(mm)) goto out; if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { down_read(&mm->mmap_sem); exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); up_read(&mm->mmap_sem); } mmput(mm); if (exact_vma_exists) { if (task_dumpable(task)) { rcu_read_lock(); cred = __task_cred(task); inode->i_uid = cred->euid; inode->i_gid = cred->egid; rcu_read_unlock(); } else { inode->i_uid = GLOBAL_ROOT_UID; inode->i_gid = GLOBAL_ROOT_GID; } security_task_to_inode(task, inode); status = 1; } out: put_task_struct(task); out_notask: if (status <= 0) d_drop(dentry); return status; } static const struct dentry_operations tid_map_files_dentry_operations = { .d_revalidate = map_files_d_revalidate, .d_delete = pid_delete_dentry, }; static int proc_map_files_get_link(struct dentry *dentry, struct path *path) { unsigned long vm_start, vm_end; struct vm_area_struct *vma; struct task_struct *task; struct mm_struct *mm; int rc; rc = -ENOENT; task = get_proc_task(dentry->d_inode); if (!task) goto out; mm = get_task_mm(task); put_task_struct(task); if (!mm) goto out; rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); if (rc) goto out_mmput; rc = -ENOENT; down_read(&mm->mmap_sem); vma = find_exact_vma(mm, vm_start, vm_end); if (vma && vma->vm_file) { *path = vma->vm_file->f_path; path_get(path); rc = 0; } up_read(&mm->mmap_sem); out_mmput: mmput(mm); out: return rc; } struct map_files_info { fmode_t mode; unsigned long len; unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ }; static int proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, struct task_struct *task, const void *ptr) { fmode_t mode = (fmode_t)(unsigned long)ptr; struct proc_inode *ei; struct inode *inode; inode = proc_pid_make_inode(dir->i_sb, task); if (!inode) return -ENOENT; ei = PROC_I(inode); ei->op.proc_get_link = proc_map_files_get_link; inode->i_op = &proc_pid_link_inode_operations; inode->i_size = 64; inode->i_mode = S_IFLNK; if (mode & FMODE_READ) inode->i_mode |= S_IRUSR; if (mode & FMODE_WRITE) inode->i_mode |= S_IWUSR; d_set_d_op(dentry, &tid_map_files_dentry_operations); d_add(dentry, inode); return 0; } static struct dentry *proc_map_files_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { unsigned long vm_start, vm_end; struct vm_area_struct *vma; struct task_struct *task; int result; struct mm_struct *mm; result = -EPERM; if (!capable(CAP_SYS_ADMIN)) goto out; result = -ENOENT; task = get_proc_task(dir); if (!task) goto out; result = -EACCES; if (!ptrace_may_access(task, PTRACE_MODE_READ)) goto out_put_task; result = -ENOENT; if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) goto out_put_task; mm = get_task_mm(task); if (!mm) goto out_put_task; down_read(&mm->mmap_sem); vma = find_exact_vma(mm, vm_start, vm_end); if (!vma) goto out_no_vma; if (vma->vm_file) result = proc_map_files_instantiate(dir, dentry, task, (void *)(unsigned long)vma->vm_file->f_mode); out_no_vma: up_read(&mm->mmap_sem); mmput(mm); out_put_task: put_task_struct(task); out: return ERR_PTR(result); } static const struct inode_operations proc_map_files_inode_operations = { .lookup = proc_map_files_lookup, .permission = proc_fd_permission, .setattr = proc_setattr, }; static int proc_map_files_readdir(struct file *file, struct dir_context *ctx) { struct vm_area_struct *vma; struct task_struct *task; struct mm_struct *mm; unsigned long nr_files, pos, i; struct flex_array *fa = NULL; struct map_files_info info; struct map_files_info *p; int ret; ret = -EPERM; if (!capable(CAP_SYS_ADMIN)) goto out; ret = -ENOENT; task = get_proc_task(file_inode(file)); if (!task) goto out; ret = -EACCES; if (!ptrace_may_access(task, PTRACE_MODE_READ)) goto out_put_task; ret = 0; if (!dir_emit_dots(file, ctx)) goto out_put_task; mm = get_task_mm(task); if (!mm) goto out_put_task; down_read(&mm->mmap_sem); nr_files = 0; /* * We need two passes here: * * 1) Collect vmas of mapped files with mmap_sem taken * 2) Release mmap_sem and instantiate entries * * otherwise we get lockdep complained, since filldir() * routine might require mmap_sem taken in might_fault(). */ for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { if (vma->vm_file && ++pos > ctx->pos) nr_files++; } if (nr_files) { fa = flex_array_alloc(sizeof(info), nr_files, GFP_KERNEL); if (!fa || flex_array_prealloc(fa, 0, nr_files, GFP_KERNEL)) { ret = -ENOMEM; if (fa) flex_array_free(fa); up_read(&mm->mmap_sem); mmput(mm); goto out_put_task; } for (i = 0, vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { if (!vma->vm_file) continue; if (++pos <= ctx->pos) continue; info.mode = vma->vm_file->f_mode; info.len = snprintf(info.name, sizeof(info.name), "%lx-%lx", vma->vm_start, vma->vm_end); if (flex_array_put(fa, i++, &info, GFP_KERNEL)) BUG(); } } up_read(&mm->mmap_sem); for (i = 0; i < nr_files; i++) { p = flex_array_get(fa, i); if (!proc_fill_cache(file, ctx, p->name, p->len, proc_map_files_instantiate, task, (void *)(unsigned long)p->mode)) break; ctx->pos++; } if (fa) flex_array_free(fa); mmput(mm); out_put_task: put_task_struct(task); out: return ret; } static const struct file_operations proc_map_files_operations = { .read = generic_read_dir, .iterate = proc_map_files_readdir, .llseek = default_llseek, }; struct timers_private { struct pid *pid; struct task_struct *task; struct sighand_struct *sighand; struct pid_namespace *ns; unsigned long flags; }; static void *timers_start(struct seq_file *m, loff_t *pos) { struct timers_private *tp = m->private; tp->task = get_pid_task(tp->pid, PIDTYPE_PID); if (!tp->task) return ERR_PTR(-ESRCH); tp->sighand = lock_task_sighand(tp->task, &tp->flags); if (!tp->sighand) return ERR_PTR(-ESRCH); return seq_list_start(&tp->task->signal->posix_timers, *pos); } static void *timers_next(struct seq_file *m, void *v, loff_t *pos) { struct timers_private *tp = m->private; return seq_list_next(v, &tp->task->signal->posix_timers, pos); } static void timers_stop(struct seq_file *m, void *v) { struct timers_private *tp = m->private; if (tp->sighand) { unlock_task_sighand(tp->task, &tp->flags); tp->sighand = NULL; } if (tp->task) { put_task_struct(tp->task); tp->task = NULL; } } static int show_timer(struct seq_file *m, void *v) { struct k_itimer *timer; struct timers_private *tp = m->private; int notify; static const char * const nstr[] = { [SIGEV_SIGNAL] = "signal", [SIGEV_NONE] = "none", [SIGEV_THREAD] = "thread", }; timer = list_entry((struct list_head *)v, struct k_itimer, list); notify = timer->it_sigev_notify; seq_printf(m, "ID: %d\n", timer->it_id); seq_printf(m, "signal: %d/%p\n", timer->sigq->info.si_signo, timer->sigq->info.si_value.sival_ptr); seq_printf(m, "notify: %s/%s.%d\n", nstr[notify & ~SIGEV_THREAD_ID], (notify & SIGEV_THREAD_ID) ? "tid" : "pid", pid_nr_ns(timer->it_pid, tp->ns)); seq_printf(m, "ClockID: %d\n", timer->it_clock); return 0; } static const struct seq_operations proc_timers_seq_ops = { .start = timers_start, .next = timers_next, .stop = timers_stop, .show = show_timer, }; static int proc_timers_open(struct inode *inode, struct file *file) { struct timers_private *tp; tp = __seq_open_private(file, &proc_timers_seq_ops, sizeof(struct timers_private)); if (!tp) return -ENOMEM; tp->pid = proc_pid(inode); tp->ns = inode->i_sb->s_fs_info; return 0; } static const struct file_operations proc_timers_operations = { .open = proc_timers_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; #endif /* CONFIG_CHECKPOINT_RESTORE */ static int proc_pident_instantiate(struct inode *dir, struct dentry *dentry, struct task_struct *task, const void *ptr) { const struct pid_entry *p = ptr; struct inode *inode; struct proc_inode *ei; inode = proc_pid_make_inode(dir->i_sb, task); if (!inode) goto out; ei = PROC_I(inode); inode->i_mode = p->mode; if (S_ISDIR(inode->i_mode)) set_nlink(inode, 2); /* Use getattr to fix if necessary */ if (p->iop) inode->i_op = p->iop; if (p->fop) inode->i_fop = p->fop; ei->op = p->op; d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, 0)) return 0; out: return -ENOENT; } static struct dentry *proc_pident_lookup(struct inode *dir, struct dentry *dentry, const struct pid_entry *ents, unsigned int nents) { int error; struct task_struct *task = get_proc_task(dir); const struct pid_entry *p, *last; error = -ENOENT; if (!task) goto out_no_task; /* * Yes, it does not scale. And it should not. Don't add * new entries into /proc/<tgid>/ without very good reasons. */ last = &ents[nents - 1]; for (p = ents; p <= last; p++) { if (p->len != dentry->d_name.len) continue; if (!memcmp(dentry->d_name.name, p->name, p->len)) break; } if (p > last) goto out; error = proc_pident_instantiate(dir, dentry, task, p); out: put_task_struct(task); out_no_task: return ERR_PTR(error); } static int proc_pident_readdir(struct file *file, struct dir_context *ctx, const struct pid_entry *ents, unsigned int nents) { struct task_struct *task = get_proc_task(file_inode(file)); const struct pid_entry *p; if (!task) return -ENOENT; if (!dir_emit_dots(file, ctx)) goto out; if (ctx->pos >= nents + 2) goto out; for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) { if (!proc_fill_cache(file, ctx, p->name, p->len, proc_pident_instantiate, task, p)) break; ctx->pos++; } out: put_task_struct(task); return 0; } #ifdef CONFIG_SECURITY static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); char *p = NULL; ssize_t length; struct task_struct *task = get_proc_task(inode); if (!task) return -ESRCH; length = security_getprocattr(task, (char*)file->f_path.dentry->d_name.name, &p); put_task_struct(task); if (length > 0) length = simple_read_from_buffer(buf, count, ppos, p, length); kfree(p); return length; } static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file_inode(file); char *page; ssize_t length; struct task_struct *task = get_proc_task(inode); length = -ESRCH; if (!task) goto out_no_task; if (count > PAGE_SIZE) count = PAGE_SIZE; /* No partial writes. */ length = -EINVAL; if (*ppos != 0) goto out; length = -ENOMEM; page = (char*)__get_free_page(GFP_TEMPORARY); if (!page) goto out; length = -EFAULT; if (copy_from_user(page, buf, count)) goto out_free; /* Guard against adverse ptrace interaction */ length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); if (length < 0) goto out_free; length = security_setprocattr(task, (char*)file->f_path.dentry->d_name.name, (void*)page, count); mutex_unlock(&task->signal->cred_guard_mutex); out_free: free_page((unsigned long) page); out: put_task_struct(task); out_no_task: return length; } static const struct file_operations proc_pid_attr_operations = { .read = proc_pid_attr_read, .write = proc_pid_attr_write, .llseek = generic_file_llseek, }; static const struct pid_entry attr_dir_stuff[] = { REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), REG("prev", S_IRUGO, proc_pid_attr_operations), REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), }; static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) { return proc_pident_readdir(file, ctx, attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); } static const struct file_operations proc_attr_dir_operations = { .read = generic_read_dir, .iterate = proc_attr_dir_readdir, .llseek = default_llseek, }; static struct dentry *proc_attr_dir_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { return proc_pident_lookup(dir, dentry, attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); } static const struct inode_operations proc_attr_dir_inode_operations = { .lookup = proc_attr_dir_lookup, .getattr = pid_getattr, .setattr = proc_setattr, }; #endif #ifdef CONFIG_ELF_CORE static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task = get_proc_task(file_inode(file)); struct mm_struct *mm; char buffer[PROC_NUMBUF]; size_t len; int ret; if (!task) return -ESRCH; ret = 0; mm = get_task_mm(task); if (mm) { len = snprintf(buffer, sizeof(buffer), "%08lx\n", ((mm->flags & MMF_DUMP_FILTER_MASK) >> MMF_DUMP_FILTER_SHIFT)); mmput(mm); ret = simple_read_from_buffer(buf, count, ppos, buffer, len); } put_task_struct(task); return ret; } static ssize_t proc_coredump_filter_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { struct task_struct *task; struct mm_struct *mm; char buffer[PROC_NUMBUF], *end; unsigned int val; int ret; int i; unsigned long mask; ret = -EFAULT; memset(buffer, 0, sizeof(buffer)); if (count > sizeof(buffer) - 1) count = sizeof(buffer) - 1; if (copy_from_user(buffer, buf, count)) goto out_no_task; ret = -EINVAL; val = (unsigned int)simple_strtoul(buffer, &end, 0); if (*end == '\n') end++; if (end - buffer == 0) goto out_no_task; ret = -ESRCH; task = get_proc_task(file_inode(file)); if (!task) goto out_no_task; ret = end - buffer; mm = get_task_mm(task); if (!mm) goto out_no_mm; for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { if (val & mask) set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); else clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); } mmput(mm); out_no_mm: put_task_struct(task); out_no_task: return ret; } static const struct file_operations proc_coredump_filter_operations = { .read = proc_coredump_filter_read, .write = proc_coredump_filter_write, .llseek = generic_file_llseek, }; #endif #ifdef CONFIG_TASK_IO_ACCOUNTING static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) { struct task_io_accounting acct = task->ioac; unsigned long flags; int result; result = mutex_lock_killable(&task->signal->cred_guard_mutex); if (result) return result; if (!ptrace_may_access(task, PTRACE_MODE_READ)) { result = -EACCES; goto out_unlock; } if (whole && lock_task_sighand(task, &flags)) { struct task_struct *t = task; task_io_accounting_add(&acct, &task->signal->ioac); while_each_thread(task, t) task_io_accounting_add(&acct, &t->ioac); unlock_task_sighand(task, &flags); } result = seq_printf(m, "rchar: %llu\n" "wchar: %llu\n" "syscr: %llu\n" "syscw: %llu\n" "read_bytes: %llu\n" "write_bytes: %llu\n" "cancelled_write_bytes: %llu\n", (unsigned long long)acct.rchar, (unsigned long long)acct.wchar, (unsigned long long)acct.syscr, (unsigned long long)acct.syscw, (unsigned long long)acct.read_bytes, (unsigned long long)acct.write_bytes, (unsigned long long)acct.cancelled_write_bytes); out_unlock: mutex_unlock(&task->signal->cred_guard_mutex); return result; } static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { return do_io_accounting(task, m, 0); } static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { return do_io_accounting(task, m, 1); } #endif /* CONFIG_TASK_IO_ACCOUNTING */ #ifdef CONFIG_USER_NS static int proc_id_map_open(struct inode *inode, struct file *file, const struct seq_operations *seq_ops) { struct user_namespace *ns = NULL; struct task_struct *task; struct seq_file *seq; int ret = -EINVAL; task = get_proc_task(inode); if (task) { rcu_read_lock(); ns = get_user_ns(task_cred_xxx(task, user_ns)); rcu_read_unlock(); put_task_struct(task); } if (!ns) goto err; ret = seq_open(file, seq_ops); if (ret) goto err_put_ns; seq = file->private_data; seq->private = ns; return 0; err_put_ns: put_user_ns(ns); err: return ret; } static int proc_id_map_release(struct inode *inode, struct file *file) { struct seq_file *seq = file->private_data; struct user_namespace *ns = seq->private; put_user_ns(ns); return seq_release(inode, file); } static int proc_uid_map_open(struct inode *inode, struct file *file) { return proc_id_map_open(inode, file, &proc_uid_seq_operations); } static int proc_gid_map_open(struct inode *inode, struct file *file) { return proc_id_map_open(inode, file, &proc_gid_seq_operations); } static int proc_projid_map_open(struct inode *inode, struct file *file) { return proc_id_map_open(inode, file, &proc_projid_seq_operations); } static const struct file_operations proc_uid_map_operations = { .open = proc_uid_map_open, .write = proc_uid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release, }; static const struct file_operations proc_gid_map_operations = { .open = proc_gid_map_open, .write = proc_gid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release, }; static const struct file_operations proc_projid_map_operations = { .open = proc_projid_map_open, .write = proc_projid_map_write, .read = seq_read, .llseek = seq_lseek, .release = proc_id_map_release, }; #endif /* CONFIG_USER_NS */ static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { int err = lock_trace(task); if (!err) { seq_printf(m, "%08x\n", task->personality); unlock_trace(task); } return err; } /* * Thread groups */ static const struct file_operations proc_task_operations; static const struct inode_operations proc_task_inode_operations; static const struct pid_entry tgid_base_stuff[] = { DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), #ifdef CONFIG_CHECKPOINT_RESTORE DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), #endif DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), #ifdef CONFIG_NET DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), #endif REG("environ", S_IRUSR, proc_environ_operations), ONE("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), #endif #ifdef CONFIG_SCHED_AUTOGROUP REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), #endif REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), #ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall), #endif ONE("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tgid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_pid_maps_operations), #ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), #endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), LNK("root", proc_root_link), LNK("exe", proc_exe_link), REG("mounts", S_IRUGO, proc_mounts_operations), REG("mountinfo", S_IRUGO, proc_mountinfo_operations), REG("mountstats", S_IRUSR, proc_mountstats_operations), #ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), REG("smaps", S_IRUGO, proc_pid_smaps_operations), REG("pagemap", S_IRUSR, proc_pagemap_operations), #endif #ifdef CONFIG_SECURITY DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), #endif #ifdef CONFIG_KALLSYMS ONE("wchan", S_IRUGO, proc_pid_wchan), #endif #ifdef CONFIG_STACKTRACE ONE("stack", S_IRUSR, proc_pid_stack), #endif #ifdef CONFIG_SCHEDSTATS ONE("schedstat", S_IRUGO, proc_pid_schedstat), #endif #ifdef CONFIG_LATENCYTOP REG("latency", S_IRUGO, proc_lstats_operations), #endif #ifdef CONFIG_PROC_PID_CPUSET REG("cpuset", S_IRUGO, proc_cpuset_operations), #endif #ifdef CONFIG_CGROUPS REG("cgroup", S_IRUGO, proc_cgroup_operations), #endif ONE("oom_score", S_IRUGO, proc_oom_score), REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), #ifdef CONFIG_AUDITSYSCALL REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations), #endif #ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), #endif #ifdef CONFIG_ELF_CORE REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), #endif #ifdef CONFIG_TASK_IO_ACCOUNTING ONE("io", S_IRUSR, proc_tgid_io_accounting), #endif #ifdef CONFIG_HARDWALL ONE("hardwall", S_IRUGO, proc_pid_hardwall), #endif #ifdef CONFIG_USER_NS REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), #endif #ifdef CONFIG_CHECKPOINT_RESTORE REG("timers", S_IRUGO, proc_timers_operations), #endif }; static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) { return proc_pident_readdir(file, ctx, tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); } static const struct file_operations proc_tgid_base_operations = { .read = generic_read_dir, .iterate = proc_tgid_base_readdir, .llseek = default_llseek, }; static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { return proc_pident_lookup(dir, dentry, tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); } static const struct inode_operations proc_tgid_base_inode_operations = { .lookup = proc_tgid_base_lookup, .getattr = pid_getattr, .setattr = proc_setattr, .permission = proc_pid_permission, }; static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) { struct dentry *dentry, *leader, *dir; char buf[PROC_NUMBUF]; struct qstr name; name.name = buf; name.len = snprintf(buf, sizeof(buf), "%d", pid); /* no ->d_hash() rejects on procfs */ dentry = d_hash_and_lookup(mnt->mnt_root, &name); if (dentry) { shrink_dcache_parent(dentry); d_drop(dentry); dput(dentry); } name.name = buf; name.len = snprintf(buf, sizeof(buf), "%d", tgid); leader = d_hash_and_lookup(mnt->mnt_root, &name); if (!leader) goto out; name.name = "task"; name.len = strlen(name.name); dir = d_hash_and_lookup(leader, &name); if (!dir) goto out_put_leader; name.name = buf; name.len = snprintf(buf, sizeof(buf), "%d", pid); dentry = d_hash_and_lookup(dir, &name); if (dentry) { shrink_dcache_parent(dentry); d_drop(dentry); dput(dentry); } dput(dir); out_put_leader: dput(leader); out: return; } /** * proc_flush_task - Remove dcache entries for @task from the /proc dcache. * @task: task that should be flushed. * * When flushing dentries from proc, one needs to flush them from global * proc (proc_mnt) and from all the namespaces' procs this task was seen * in. This call is supposed to do all of this job. * * Looks in the dcache for * /proc/@pid * /proc/@tgid/task/@pid * if either directory is present flushes it and all of it'ts children * from the dcache. * * It is safe and reasonable to cache /proc entries for a task until * that task exits. After that they just clog up the dcache with * useless entries, possibly causing useful dcache entries to be * flushed instead. This routine is proved to flush those useless * dcache entries at process exit time. * * NOTE: This routine is just an optimization so it does not guarantee * that no dcache entries will exist at process exit time it * just makes it very unlikely that any will persist. */ void proc_flush_task(struct task_struct *task) { int i; struct pid *pid, *tgid; struct upid *upid; pid = task_pid(task); tgid = task_tgid(task); for (i = 0; i <= pid->level; i++) { upid = &pid->numbers[i]; proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, tgid->numbers[i].nr); } } static int proc_pid_instantiate(struct inode *dir, struct dentry * dentry, struct task_struct *task, const void *ptr) { struct inode *inode; inode = proc_pid_make_inode(dir->i_sb, task); if (!inode) goto out; inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE; set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff))); d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, 0)) return 0; out: return -ENOENT; } struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) { int result = -ENOENT; struct task_struct *task; unsigned tgid; struct pid_namespace *ns; tgid = name_to_int(&dentry->d_name); if (tgid == ~0U) goto out; ns = dentry->d_sb->s_fs_info; rcu_read_lock(); task = find_task_by_pid_ns(tgid, ns); if (task) get_task_struct(task); rcu_read_unlock(); if (!task) goto out; result = proc_pid_instantiate(dir, dentry, task, NULL); put_task_struct(task); out: return ERR_PTR(result); } /* * Find the first task with tgid >= tgid * */ struct tgid_iter { unsigned int tgid; struct task_struct *task; }; static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) { struct pid *pid; if (iter.task) put_task_struct(iter.task); rcu_read_lock(); retry: iter.task = NULL; pid = find_ge_pid(iter.tgid, ns); if (pid) { iter.tgid = pid_nr_ns(pid, ns); iter.task = pid_task(pid, PIDTYPE_PID); /* What we to know is if the pid we have find is the * pid of a thread_group_leader. Testing for task * being a thread_group_leader is the obvious thing * todo but there is a window when it fails, due to * the pid transfer logic in de_thread. * * So we perform the straight forward test of seeing * if the pid we have found is the pid of a thread * group leader, and don't worry if the task we have * found doesn't happen to be a thread group leader. * As we don't care in the case of readdir. */ if (!iter.task || !has_group_leader_pid(iter.task)) { iter.tgid += 1; goto retry; } get_task_struct(iter.task); } rcu_read_unlock(); return iter; } #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) /* for the /proc/ directory itself, after non-process stuff has been done */ int proc_pid_readdir(struct file *file, struct dir_context *ctx) { struct tgid_iter iter; struct pid_namespace *ns = file->f_dentry->d_sb->s_fs_info; loff_t pos = ctx->pos; if (pos >= PID_MAX_LIMIT + TGID_OFFSET) return 0; if (pos == TGID_OFFSET - 2) { struct inode *inode = ns->proc_self->d_inode; if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) return 0; ctx->pos = pos = pos + 1; } if (pos == TGID_OFFSET - 1) { struct inode *inode = ns->proc_thread_self->d_inode; if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) return 0; ctx->pos = pos = pos + 1; } iter.tgid = pos - TGID_OFFSET; iter.task = NULL; for (iter = next_tgid(ns, iter); iter.task; iter.tgid += 1, iter = next_tgid(ns, iter)) { char name[PROC_NUMBUF]; int len; if (!has_pid_permissions(ns, iter.task, 2)) continue; len = snprintf(name, sizeof(name), "%d", iter.tgid); ctx->pos = iter.tgid + TGID_OFFSET; if (!proc_fill_cache(file, ctx, name, len, proc_pid_instantiate, iter.task, NULL)) { put_task_struct(iter.task); return 0; } } ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; return 0; } /* * Tasks */ static const struct pid_entry tid_base_stuff[] = { DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), #ifdef CONFIG_NET DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), #endif REG("environ", S_IRUSR, proc_environ_operations), ONE("auxv", S_IRUSR, proc_pid_auxv), ONE("status", S_IRUGO, proc_pid_status), ONE("personality", S_IRUSR, proc_pid_personality), ONE("limits", S_IRUGO, proc_pid_limits), #ifdef CONFIG_SCHED_DEBUG REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), #endif REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), #ifdef CONFIG_HAVE_ARCH_TRACEHOOK ONE("syscall", S_IRUSR, proc_pid_syscall), #endif ONE("cmdline", S_IRUGO, proc_pid_cmdline), ONE("stat", S_IRUGO, proc_tid_stat), ONE("statm", S_IRUGO, proc_pid_statm), REG("maps", S_IRUGO, proc_tid_maps_operations), #ifdef CONFIG_CHECKPOINT_RESTORE REG("children", S_IRUGO, proc_tid_children_operations), #endif #ifdef CONFIG_NUMA REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), #endif REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), LNK("cwd", proc_cwd_link), LNK("root", proc_root_link), LNK("exe", proc_exe_link), REG("mounts", S_IRUGO, proc_mounts_operations), REG("mountinfo", S_IRUGO, proc_mountinfo_operations), #ifdef CONFIG_PROC_PAGE_MONITOR REG("clear_refs", S_IWUSR, proc_clear_refs_operations), REG("smaps", S_IRUGO, proc_tid_smaps_operations), REG("pagemap", S_IRUSR, proc_pagemap_operations), #endif #ifdef CONFIG_SECURITY DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), #endif #ifdef CONFIG_KALLSYMS ONE("wchan", S_IRUGO, proc_pid_wchan), #endif #ifdef CONFIG_STACKTRACE ONE("stack", S_IRUSR, proc_pid_stack), #endif #ifdef CONFIG_SCHEDSTATS ONE("schedstat", S_IRUGO, proc_pid_schedstat), #endif #ifdef CONFIG_LATENCYTOP REG("latency", S_IRUGO, proc_lstats_operations), #endif #ifdef CONFIG_PROC_PID_CPUSET REG("cpuset", S_IRUGO, proc_cpuset_operations), #endif #ifdef CONFIG_CGROUPS REG("cgroup", S_IRUGO, proc_cgroup_operations), #endif ONE("oom_score", S_IRUGO, proc_oom_score), REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), #ifdef CONFIG_AUDITSYSCALL REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), REG("sessionid", S_IRUGO, proc_sessionid_operations), #endif #ifdef CONFIG_FAULT_INJECTION REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), #endif #ifdef CONFIG_TASK_IO_ACCOUNTING ONE("io", S_IRUSR, proc_tid_io_accounting), #endif #ifdef CONFIG_HARDWALL ONE("hardwall", S_IRUGO, proc_pid_hardwall), #endif #ifdef CONFIG_USER_NS REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), #endif }; static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) { return proc_pident_readdir(file, ctx, tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); } static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { return proc_pident_lookup(dir, dentry, tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); } static const struct file_operations proc_tid_base_operations = { .read = generic_read_dir, .iterate = proc_tid_base_readdir, .llseek = default_llseek, }; static const struct inode_operations proc_tid_base_inode_operations = { .lookup = proc_tid_base_lookup, .getattr = pid_getattr, .setattr = proc_setattr, }; static int proc_task_instantiate(struct inode *dir, struct dentry *dentry, struct task_struct *task, const void *ptr) { struct inode *inode; inode = proc_pid_make_inode(dir->i_sb, task); if (!inode) goto out; inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; inode->i_op = &proc_tid_base_inode_operations; inode->i_fop = &proc_tid_base_operations; inode->i_flags|=S_IMMUTABLE; set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, ARRAY_SIZE(tid_base_stuff))); d_set_d_op(dentry, &pid_dentry_operations); d_add(dentry, inode); /* Close the race of the process dying before we return the dentry */ if (pid_revalidate(dentry, 0)) return 0; out: return -ENOENT; } static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) { int result = -ENOENT; struct task_struct *task; struct task_struct *leader = get_proc_task(dir); unsigned tid; struct pid_namespace *ns; if (!leader) goto out_no_task; tid = name_to_int(&dentry->d_name); if (tid == ~0U) goto out; ns = dentry->d_sb->s_fs_info; rcu_read_lock(); task = find_task_by_pid_ns(tid, ns); if (task) get_task_struct(task); rcu_read_unlock(); if (!task) goto out; if (!same_thread_group(leader, task)) goto out_drop_task; result = proc_task_instantiate(dir, dentry, task, NULL); out_drop_task: put_task_struct(task); out: put_task_struct(leader); out_no_task: return ERR_PTR(result); } /* * Find the first tid of a thread group to return to user space. * * Usually this is just the thread group leader, but if the users * buffer was too small or there was a seek into the middle of the * directory we have more work todo. * * In the case of a short read we start with find_task_by_pid. * * In the case of a seek we start with the leader and walk nr * threads past it. */ static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, struct pid_namespace *ns) { struct task_struct *pos, *task; unsigned long nr = f_pos; if (nr != f_pos) /* 32bit overflow? */ return NULL; rcu_read_lock(); task = pid_task(pid, PIDTYPE_PID); if (!task) goto fail; /* Attempt to start with the tid of a thread */ if (tid && nr) { pos = find_task_by_pid_ns(tid, ns); if (pos && same_thread_group(pos, task)) goto found; } /* If nr exceeds the number of threads there is nothing todo */ if (nr >= get_nr_threads(task)) goto fail; /* If we haven't found our starting place yet start * with the leader and walk nr threads forward. */ pos = task = task->group_leader; do { if (!nr--) goto found; } while_each_thread(task, pos); fail: pos = NULL; goto out; found: get_task_struct(pos); out: rcu_read_unlock(); return pos; } /* * Find the next thread in the thread list. * Return NULL if there is an error or no next thread. * * The reference to the input task_struct is released. */ static struct task_struct *next_tid(struct task_struct *start) { struct task_struct *pos = NULL; rcu_read_lock(); if (pid_alive(start)) { pos = next_thread(start); if (thread_group_leader(pos)) pos = NULL; else get_task_struct(pos); } rcu_read_unlock(); put_task_struct(start); return pos; } /* for the /proc/TGID/task/ directories */ static int proc_task_readdir(struct file *file, struct dir_context *ctx) { struct inode *inode = file_inode(file); struct task_struct *task; struct pid_namespace *ns; int tid; if (proc_inode_is_dead(inode)) return -ENOENT; if (!dir_emit_dots(file, ctx)) return 0; /* f_version caches the tgid value that the last readdir call couldn't * return. lseek aka telldir automagically resets f_version to 0. */ ns = file->f_dentry->d_sb->s_fs_info; tid = (int)file->f_version; file->f_version = 0; for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); task; task = next_tid(task), ctx->pos++) { char name[PROC_NUMBUF]; int len; tid = task_pid_nr_ns(task, ns); len = snprintf(name, sizeof(name), "%d", tid); if (!proc_fill_cache(file, ctx, name, len, proc_task_instantiate, task, NULL)) { /* returning this tgid failed, save it as the first * pid for the next readir call */ file->f_version = (u64)tid; put_task_struct(task); break; } } return 0; } static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) { struct inode *inode = dentry->d_inode; struct task_struct *p = get_proc_task(inode); generic_fillattr(inode, stat); if (p) { stat->nlink += get_nr_threads(p); put_task_struct(p); } return 0; } static const struct inode_operations proc_task_inode_operations = { .lookup = proc_task_lookup, .getattr = proc_task_getattr, .setattr = proc_setattr, .permission = proc_pid_permission, }; static const struct file_operations proc_task_operations = { .read = generic_read_dir, .iterate = proc_task_readdir, .llseek = default_llseek, };


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