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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: Micha Kalfon <micha@cellrox.com> Acked-by: Oren Laadan <orenl@cellrox.com>
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@ -2129,11 +2129,11 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
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error = prctl_set_vma(arg2, arg3, arg4, arg5);
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break;
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case PR_SET_TIMERSLACK_PID:
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if (current->pid != (pid_t)arg3 &&
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if (task_pid_vnr(current) != (pid_t)arg3 &&
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!capable(CAP_SYS_NICE))
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return -EPERM;
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rcu_read_lock();
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tsk = find_task_by_pid_ns((pid_t)arg3, &init_pid_ns);
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tsk = find_task_by_vpid((pid_t)arg3);
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if (tsk == NULL) {
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rcu_read_unlock();
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return -EINVAL;
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