Use find_task_by_vpid in posix timers

All the functions that need to lookup a task by pid in posix timers obtain
this pid from a user space, and thus this value refers to a task in the same
namespace, as the current task lives in.

So the proper behavior is to call find_task_by_vpid() here.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 5 insertions, 5 deletions

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 0b7c82ac467e..2eae91f954ca 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -20,7 +20,7 @@ static int check_clock(const clockid_t which_clock)
                 return 0;
 
         read_lock(&tasklist_lock);
-        p = find_task_by_pid(pid);
+        p = find_task_by_vpid(pid);
         if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
                    same_thread_group(p, current) : thread_group_leader(p))) {
                 error = -EINVAL;
@@ -305,7 +305,7 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
                  */
                 struct task_struct *p;
                 rcu_read_lock();
-                p = find_task_by_pid(pid);
+                p = find_task_by_vpid(pid);
                 if (p) {
                         if (CPUCLOCK_PERTHREAD(which_clock)) {
                                 if (same_thread_group(p, current)) {
@@ -354,7 +354,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
                 if (pid == 0) {
                         p = current;
                 } else {
-                        p = find_task_by_pid(pid);
+                        p = find_task_by_vpid(pid);
                         if (p && !same_thread_group(p, current))
                                 p = NULL;
                 }
@@ -362,7 +362,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
                 if (pid == 0) {
                         p = current->group_leader;
                 } else {
-                        p = find_task_by_pid(pid);
+                        p = find_task_by_vpid(pid);
                         if (p && !thread_group_leader(p))
                                 p = NULL;
                 }
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 122d5c787fe2..ce268966007d 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -404,7 +404,7 @@ static struct task_struct * good_sigevent(sigevent_t * event)
         struct task_struct *rtn = current->group_leader;
 
         if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
-                (!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) ||
+                (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
                  !same_thread_group(rtn, current) ||
                  (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
                 return NULL;