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Commit d4d049c5 authored by Micha Kalfon's avatar Micha Kalfon Committed by John Stultz
Browse files

prctl: make PR_SET_TIMERSLACK_PID pid namespace aware 



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: default avatarMicha Kalfon <micha@cellrox.com>
Acked-by: default avatarOren Laadan <orenl@cellrox.com>
parent 18f42f60

kernel/sys.c

+2 −2
Original line number Diff line number Diff line
@@ -2220,11 +2220,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, 
		error = prctl_get_tid_address(me, (int __user **)arg2);

		break;

	case PR_SET_TIMERSLACK_PID:

		if (current->pid != (pid_t)arg3 &&

		if (task_pid_vnr(current) != (pid_t)arg3 &&

				!capable(CAP_SYS_NICE))

			return -EPERM;

		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) {

			rcu_read_unlock();

			return -EINVAL;