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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>
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@ -20,7 +20,7 @@ static int check_clock(const clockid_t which_clock)
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return 0;
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return 0;
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read_lock(&tasklist_lock);
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read_lock(&tasklist_lock);
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p = find_task_by_pid(pid);
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p = find_task_by_vpid(pid);
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if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
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if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ?
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same_thread_group(p, current) : thread_group_leader(p))) {
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same_thread_group(p, current) : thread_group_leader(p))) {
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error = -EINVAL;
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error = -EINVAL;
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@ -305,7 +305,7 @@ int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp)
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*/
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*/
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struct task_struct *p;
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struct task_struct *p;
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rcu_read_lock();
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rcu_read_lock();
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p = find_task_by_pid(pid);
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p = find_task_by_vpid(pid);
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if (p) {
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if (p) {
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if (CPUCLOCK_PERTHREAD(which_clock)) {
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if (CPUCLOCK_PERTHREAD(which_clock)) {
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if (same_thread_group(p, current)) {
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if (same_thread_group(p, current)) {
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@ -354,7 +354,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
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if (pid == 0) {
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if (pid == 0) {
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p = current;
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p = current;
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} else {
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} else {
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p = find_task_by_pid(pid);
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p = find_task_by_vpid(pid);
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if (p && !same_thread_group(p, current))
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if (p && !same_thread_group(p, current))
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p = NULL;
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p = NULL;
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}
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}
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@ -362,7 +362,7 @@ int posix_cpu_timer_create(struct k_itimer *new_timer)
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if (pid == 0) {
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if (pid == 0) {
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p = current->group_leader;
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p = current->group_leader;
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} else {
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} else {
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p = find_task_by_pid(pid);
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p = find_task_by_vpid(pid);
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if (p && !thread_group_leader(p))
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if (p && !thread_group_leader(p))
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p = NULL;
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p = NULL;
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}
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}
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@ -404,7 +404,7 @@ static struct task_struct * good_sigevent(sigevent_t * event)
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struct task_struct *rtn = current->group_leader;
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struct task_struct *rtn = current->group_leader;
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if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
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if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
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(!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) ||
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(!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
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!same_thread_group(rtn, current) ||
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!same_thread_group(rtn, current) ||
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(event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
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(event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL))
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return NULL;
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return NULL;
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