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prctl: make PR_SET_TIMERSLACK_PID pid namespace aware

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Make PR_SET_TIMERSLACK_PID consider pid namespace and resolve the
target pid in the caller's namespace. Otherwise, calls from pid
namespace other than init would fail or affect the wrong task.

Change-Id: I1da15196abc4096536713ce03714e99d2e63820a
Signed-off-by: Micha Kalfon <micha@cellrox.com>
Acked-by: Oren Laadan <orenl@cellrox.com>
This commit is contained in:
Micha Kalfon 2015-01-13 12:12:57 +02:00 • committed by John Stultz
parent 18f42f60be
commit d4d049c55d
1 changed files with 2 additions and 2 deletions
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4
kernel/sys.c
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@ -2220,11 +2220,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
error = prctl_get_tid_address(me, (int __user **)arg2); error = prctl_get_tid_address(me, (int __user **)arg2);
break; break;
case PR_SET_TIMERSLACK_PID: case PR_SET_TIMERSLACK_PID:
if (current->pid != (pid_t)arg3 && if (task_pid_vnr(current) != (pid_t)arg3 &&
!capable(CAP_SYS_NICE)) !capable(CAP_SYS_NICE))
return -EPERM; return -EPERM;
rcu_read_lock(); rcu_read_lock();
tsk = find_task_by_pid_ns((pid_t)arg3, &init_pid_ns); tsk = find_task_by_vpid((pid_t)arg3);
if (tsk == NULL) { if (tsk == NULL) {
rcu_read_unlock(); rcu_read_unlock();
return -EINVAL; return -EINVAL;