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exit_notify: kill the wrong capable(CAP_KILL) check
The CAP_KILL check in exit_notify() looks just wrong, kill it. Whatever logic we have to reset ->exit_signal, the malicious user can bypass it if it execs the setuid application before exiting. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Serge Hallyn <serue@us.ibm.com> Acked-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -837,8 +837,7 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
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*/
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if (tsk->exit_signal != SIGCHLD && !task_detached(tsk) &&
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(tsk->parent_exec_id != tsk->real_parent->self_exec_id ||
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tsk->self_exec_id != tsk->parent_exec_id) &&
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!capable(CAP_KILL))
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tsk->self_exec_id != tsk->parent_exec_id))
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tsk->exit_signal = SIGCHLD;
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signal = tracehook_notify_death(tsk, &cookie, group_dead);
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