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ptrace: give more respect to SIGKILL 

ptrace_stop() has some complicated checks to prevent the scheduling in the
TASK_TRACED state with the pending SIGKILL, but these checks are racy, and
they depend on arch_ptrace_stop_needed().

This patch assumes that the traced task should die asap if it was killed by
SIGKILL, in that case schedule()->signal_pending_state() has no reason to
ignore the TASK_WAKEKILL part of TASK_TRACED, and we can kill this nasty
special case.

Note: do_exit()->ptrace_notify() is special, the killed task can already
dequeue SIGKILL at this point. Another indication that fatal_signal_pending()
is not exactly right.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2008-07-25 01:47:36 -07:00 committed by Linus Torvalds
parent f22ab814a2
commit 364d3c13c1
1 changed files with 0 additions and 3 deletions
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3
include/linux/sched.h
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@ -2054,9 +2054,6 @@ static inline int signal_pending_state(long state, struct task_struct *p)
if (!signal_pending(p))
return 0;
if (state & (__TASK_STOPPED | __TASK_TRACED))
return 0;
return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p);
}