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posix-timers: Correct sanity check in posix_cpu_nsleep 

CPUCLOCK_PID(which_clock) is a pid value from userspace so compare it
against task_pid_vnr, not current->pid.  As task_pid_vnr is in the tasks
pid value in the tasks pid namespace, and current->pid is in the
initial pid namespace.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2017-04-13 10:32:16 -05:00
parent b54807fa52
commit 01a2197485
1 changed files with 1 additions and 1 deletions
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kernel/time/posix-cpu-timers.c
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@ -1312,7 +1312,7 @@ static int posix_cpu_nsleep(const clockid_t which_clock, int flags,
*/
if (CPUCLOCK_PERTHREAD(which_clock) &&
(CPUCLOCK_PID(which_clock) == 0 ||
CPUCLOCK_PID(which_clock) == current->pid))
CPUCLOCK_PID(which_clock) == task_pid_vnr(current)))
return -EINVAL;
error = do_cpu_nanosleep(which_clock, flags, rqtp, &it);