Merge branch 'core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...

[~andy/linux] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 30fcdf16737a2bb013a78b62bc6b7f1eb6eb165b..a946221879d7c03b2263ae4842e2de15b00e30a9 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -46,12 +46,18 @@
 #include <linux/blkdev.h>
 #include <linux/task_io_accounting_ops.h>
 #include <linux/tracehook.h>
+#include <linux/init_task.h>
 #include <trace/sched.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
+#include "cred-internals.h"
+
+DEFINE_TRACE(sched_process_free);
+DEFINE_TRACE(sched_process_exit);
+DEFINE_TRACE(sched_process_wait);
 
 static void exit_mm(struct task_struct * tsk);
 
@@ -164,7 +170,10 @@ void release_task(struct task_struct * p)
        int zap_leader;
 repeat:
        tracehook_prepare_release_task(p);
-       atomic_dec(&p->user->processes);
+       /* don't need to get the RCU readlock here - the process is dead and
+        * can't be modifying its own credentials */
+       atomic_dec(&__task_cred(p)->user->processes);
+
        proc_flush_task(p);
        write_lock_irq(&tasklist_lock);
        tracehook_finish_release_task(p);
@@ -339,12 +348,12 @@ static void reparent_to_kthreadd(void)
        /* cpus_allowed? */
        /* rt_priority? */
        /* signals? */
-       security_task_reparent_to_init(current);
        memcpy(current->signal->rlim, init_task.signal->rlim,
               sizeof(current->signal->rlim));
-       atomic_inc(&(INIT_USER->__count));
+
+       atomic_inc(&init_cred.usage);
+       commit_creds(&init_cred);
        write_unlock_irq(&tasklist_lock);
-       switch_uid(INIT_USER);
 }
 
 void __set_special_pids(struct pid *pid)
@@ -1078,7 +1087,6 @@ NORET_TYPE void do_exit(long code)
        check_stack_usage();
        exit_thread();
        cgroup_exit(tsk, 1);
-       exit_keys(tsk);
 
        if (group_dead && tsk->signal->leader)
                disassociate_ctty(1);
@@ -1123,7 +1131,6 @@ NORET_TYPE void do_exit(long code)
        preempt_disable();
        /* causes final put_task_struct in finish_task_switch(). */
        tsk->state = TASK_DEAD;
-
        schedule();
        BUG();
        /* Avoid "noreturn function does return".  */
@@ -1263,12 +1270,12 @@ static int wait_task_zombie(struct task_struct *p, int options,
        unsigned long state;
        int retval, status, traced;
        pid_t pid = task_pid_vnr(p);
+       uid_t uid = __task_cred(p)->uid;
 
        if (!likely(options & WEXITED))
                return 0;
 
        if (unlikely(options & WNOWAIT)) {
-               uid_t uid = p->uid;
                int exit_code = p->exit_code;
                int why, status;
 
@@ -1389,7 +1396,7 @@ static int wait_task_zombie(struct task_struct *p, int options,
        if (!retval && infop)
                retval = put_user(pid, &infop->si_pid);
        if (!retval && infop)
-               retval = put_user(p->uid, &infop->si_uid);
+               retval = put_user(uid, &infop->si_uid);
        if (!retval)
                retval = pid;
 
@@ -1454,7 +1461,8 @@ static int wait_task_stopped(int ptrace, struct task_struct *p,
        if (!unlikely(options & WNOWAIT))
                p->exit_code = 0;
 
-       uid = p->uid;
+       /* don't need the RCU readlock here as we're holding a spinlock */
+       uid = __task_cred(p)->uid;
 unlock_sig:
        spin_unlock_irq(&p->sighand->siglock);
        if (!exit_code)
@@ -1528,10 +1536,10 @@ static int wait_task_continued(struct task_struct *p, int options,
        }
        if (!unlikely(options & WNOWAIT))
                p->signal->flags &= ~SIGNAL_STOP_CONTINUED;
+       uid = __task_cred(p)->uid;
        spin_unlock_irq(&p->sighand->siglock);
 
        pid = task_pid_vnr(p);
-       uid = p->uid;
        get_task_struct(p);
        read_unlock(&tasklist_lock);