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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>
This commit is contained in:
Pavel Emelyanov 2008-02-08 04:21:52 -08:00 committed by Linus Torvalds
parent 20a8143eaa
commit 8dc86af006
2 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
kernel/posix-cpu-timers.c
View File

@ -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;
}

2
kernel/posix-timers.c
View File

@ -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;