1 files changed, 58 insertions, 43 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 495da2e9a8b4..4018308048cf 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -47,6 +47,7 @@
 #include <linux/mount.h>
 #include <linux/audit.h>
 #include <linux/memcontrol.h>
+#include <linux/ftrace.h>
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/acct.h>
@@ -80,6 +81,8 @@ DEFINE_PER_CPU(unsigned long, process_counts) = 0;
 
 __cacheline_aligned DEFINE_RWLOCK(tasklist_lock);  /* outer */
 
+DEFINE_TRACE(sched_process_fork);
+
 int nr_processes(void)
 {
         int cpu;
@@ -137,6 +140,7 @@ void free_task(struct task_struct *tsk)
         prop_local_destroy_single(&tsk->dirties);
         free_thread_info(tsk->stack);
         rt_mutex_debug_task_free(tsk);
+        ftrace_graph_exit_task(tsk);
         free_task_struct(tsk);
 }
 EXPORT_SYMBOL(free_task);
@@ -147,9 +151,8 @@ void __put_task_struct(struct task_struct *tsk)
         WARN_ON(atomic_read(&tsk->usage));
         WARN_ON(tsk == current);
 
-        security_task_free(tsk);
-        free_uid(tsk->user);
-        put_group_info(tsk->group_info);
+        put_cred(tsk->real_cred);
+        put_cred(tsk->cred);
         delayacct_tsk_free(tsk);
 
         if (!profile_handoff_task(tsk))
@@ -397,6 +400,18 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock);
 #define allocate_mm()   (kmem_cache_alloc(mm_cachep, GFP_KERNEL))
 #define free_mm(mm)     (kmem_cache_free(mm_cachep, (mm)))
 
+static unsigned long default_dump_filter = MMF_DUMP_FILTER_DEFAULT;
+
+static int __init coredump_filter_setup(char *s)
+{
+        default_dump_filter =
+                (simple_strtoul(s, NULL, 0) << MMF_DUMP_FILTER_SHIFT) &
+                MMF_DUMP_FILTER_MASK;
+        return 1;
+}
+
+__setup("coredump_filter=", coredump_filter_setup);
+
 #include <linux/init_task.h>
 
 static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
@@ -405,15 +420,14 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
         atomic_set(&mm->mm_count, 1);
         init_rwsem(&mm->mmap_sem);
         INIT_LIST_HEAD(&mm->mmlist);
-        mm->flags = (current->mm) ? current->mm->flags
-                                  : MMF_DUMP_FILTER_DEFAULT;
+        mm->flags = (current->mm) ? current->mm->flags : default_dump_filter;
         mm->core_state = NULL;
         mm->nr_ptes = 0;
         set_mm_counter(mm, file_rss, 0);
         set_mm_counter(mm, anon_rss, 0);
         spin_lock_init(&mm->page_table_lock);
-        rwlock_init(&mm->ioctx_list_lock);
-        mm->ioctx_list = NULL;
+        spin_lock_init(&mm->ioctx_lock);
+        INIT_HLIST_HEAD(&mm->ioctx_list);
         mm->free_area_cache = TASK_UNMAPPED_BASE;
         mm->cached_hole_size = ~0UL;
         mm_init_owner(mm, p);
@@ -755,7 +769,7 @@ static int copy_sighand(unsigned long clone_flags, struct task_struct *tsk)
 {
         struct sighand_struct *sig;
 
-        if (clone_flags & (CLONE_SIGHAND | CLONE_THREAD)) {
+        if (clone_flags & CLONE_SIGHAND) {
                 atomic_inc(&current->sighand->count);
                 return 0;
         }
@@ -818,12 +832,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
         if (!sig)
                 return -ENOMEM;
 
-        ret = copy_thread_group_keys(tsk);
-        if (ret < 0) {
-                kmem_cache_free(signal_cachep, sig);
-                return ret;
-        }
-
         atomic_set(&sig->count, 1);
         atomic_set(&sig->live, 1);
         init_waitqueue_head(&sig->wait_chldexit);
@@ -868,7 +876,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 void __cleanup_signal(struct signal_struct *sig)
 {
         thread_group_cputime_free(sig);
-        exit_thread_group_keys(sig);
         tty_kref_put(sig->tty);
         kmem_cache_free(signal_cachep, sig);
 }
@@ -984,16 +991,16 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
 #endif
         retval = -EAGAIN;
-        if (atomic_read(&p->user->processes) >=
+        if (atomic_read(&p->real_cred->user->processes) >=
                         p->signal->rlim[RLIMIT_NPROC].rlim_cur) {
                 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RESOURCE) &&
-                    p->user != current->nsproxy->user_ns->root_user)
+                    p->real_cred->user != INIT_USER)
                         goto bad_fork_free;
         }
 
-        atomic_inc(&p->user->__count);
-        atomic_inc(&p->user->processes);
-        get_group_info(p->group_info);
+        retval = copy_creds(p, clone_flags);
+        if (retval < 0)
+                goto bad_fork_free;
 
         /*
          * If multiple threads are within copy_process(), then this check
@@ -1048,10 +1055,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         do_posix_clock_monotonic_gettime(&p->start_time);
         p->real_start_time = p->start_time;
         monotonic_to_bootbased(&p->real_start_time);
-#ifdef CONFIG_SECURITY
-        p->security = NULL;
-#endif
-        p->cap_bset = current->cap_bset;
         p->io_context = NULL;
         p->audit_context = NULL;
         cgroup_fork(p);
@@ -1092,14 +1095,14 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifdef CONFIG_DEBUG_MUTEXES
         p->blocked_on = NULL; /* not blocked yet */
 #endif
+        if (unlikely(ptrace_reparented(current)))
+                ptrace_fork(p, clone_flags);
 
         /* Perform scheduler related setup. Assign this task to a CPU. */
         sched_fork(p, clone_flags);
 
-        if ((retval = security_task_alloc(p)))
-                goto bad_fork_cleanup_policy;
         if ((retval = audit_alloc(p)))
-                goto bad_fork_cleanup_security;
+                goto bad_fork_cleanup_policy;
         /* copy all the process information */
         if ((retval = copy_semundo(clone_flags, p)))
                 goto bad_fork_cleanup_audit;
@@ -1113,10 +1116,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 goto bad_fork_cleanup_sighand;
         if ((retval = copy_mm(clone_flags, p)))
                 goto bad_fork_cleanup_signal;
-        if ((retval = copy_keys(clone_flags, p)))
-                goto bad_fork_cleanup_mm;
         if ((retval = copy_namespaces(clone_flags, p)))
-                goto bad_fork_cleanup_keys;
+                goto bad_fork_cleanup_mm;
         if ((retval = copy_io(clone_flags, p)))
                 goto bad_fork_cleanup_namespaces;
         retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
@@ -1125,17 +1126,19 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
         if (pid != &init_struct_pid) {
                 retval = -ENOMEM;
-                pid = alloc_pid(task_active_pid_ns(p));
+                pid = alloc_pid(p->nsproxy->pid_ns);
                 if (!pid)
                         goto bad_fork_cleanup_io;
 
                 if (clone_flags & CLONE_NEWPID) {
-                        retval = pid_ns_prepare_proc(task_active_pid_ns(p));
+                        retval = pid_ns_prepare_proc(p->nsproxy->pid_ns);
                         if (retval < 0)
                                 goto bad_fork_free_pid;
                 }
         }
 
+        ftrace_graph_init_task(p);
+
         p->pid = pid_nr(pid);
         p->tgid = p->pid;
         if (clone_flags & CLONE_THREAD)
@@ -1144,7 +1147,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         if (current->nsproxy != p->nsproxy) {
                 retval = ns_cgroup_clone(p, pid);
                 if (retval)
-                        goto bad_fork_free_pid;
+                        goto bad_fork_free_graph;
         }
 
         p->set_child_tid = (clone_flags & CLONE_CHILD_SETTID) ? child_tidptr : NULL;
@@ -1237,7 +1240,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 spin_unlock(&current->sighand->siglock);
                 write_unlock_irq(&tasklist_lock);
                 retval = -ERESTARTNOINTR;
-                goto bad_fork_free_pid;
+                goto bad_fork_free_graph;
         }
 
         if (clone_flags & CLONE_THREAD) {
@@ -1274,6 +1277,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         cgroup_post_fork(p);
         return p;
 
+bad_fork_free_graph:
+        ftrace_graph_exit_task(p);
 bad_fork_free_pid:
         if (pid != &init_struct_pid)
                 free_pid(pid);
@@ -1281,8 +1286,6 @@ bad_fork_cleanup_io:
         put_io_context(p->io_context);
 bad_fork_cleanup_namespaces:
         exit_task_namespaces(p);
-bad_fork_cleanup_keys:
-        exit_keys(p);
 bad_fork_cleanup_mm:
         if (p->mm)
                 mmput(p->mm);
@@ -1298,8 +1301,6 @@ bad_fork_cleanup_semundo:
         exit_sem(p);
 bad_fork_cleanup_audit:
         audit_free(p);
-bad_fork_cleanup_security:
-        security_task_free(p);
 bad_fork_cleanup_policy:
 #ifdef CONFIG_NUMA
         mpol_put(p->mempolicy);
@@ -1312,9 +1313,9 @@ bad_fork_cleanup_cgroup:
 bad_fork_cleanup_put_domain:
         module_put(task_thread_info(p)->exec_domain->module);
 bad_fork_cleanup_count:
-        put_group_info(p->group_info);
-        atomic_dec(&p->user->processes);
-        free_uid(p->user);
+        atomic_dec(&p->cred->user->processes);
+        put_cred(p->real_cred);
+        put_cred(p->cred);
 bad_fork_free:
         free_task(p);
 fork_out:
@@ -1358,6 +1359,21 @@ long do_fork(unsigned long clone_flags,
         long nr;
 
         /*
+         * Do some preliminary argument and permissions checking before we
+         * actually start allocating stuff
+         */
+        if (clone_flags & CLONE_NEWUSER) {
+                if (clone_flags & CLONE_THREAD)
+                        return -EINVAL;
+                /* hopefully this check will go away when userns support is
+                 * complete
+                 */
+                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SETUID) ||
+                                !capable(CAP_SETGID))
+                        return -EPERM;
+        }
+
+        /*
          * We hope to recycle these flags after 2.6.26
          */
         if (unlikely(clone_flags & CLONE_STOPPED)) {
@@ -1605,8 +1621,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags)
         err = -EINVAL;
         if (unshare_flags & ~(CLONE_THREAD|CLONE_FS|CLONE_NEWNS|CLONE_SIGHAND|
                                 CLONE_VM|CLONE_FILES|CLONE_SYSVSEM|
-                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|
-                                CLONE_NEWNET))
+                                CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET))
                 goto bad_unshare_out;
 
         /*