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authorOleg Nesterov <oleg@tv-sign.ru>2008-07-25 01:47:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:39 -0700
commit364d3c13c17f45da6d638011078d4c4d3070d719 (patch)
tree2e6215dd458010cd92786ac7d67053c5d5171c74
parentf22ab814a24e654b1de24db0c5f8b57b5ab2026a (diff)
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>
-rw-r--r--include/linux/sched.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6aca4a16e37..79e749dbf81 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -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);
}