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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2008-04-30 00:53:05 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-30 08:29:37 -0700 |
| commit | 80fe728d593e3a048a56610de932919f7d6d968a (patch) | |
| tree | ff8effec1d05d871bcbb1347947d2a0970a8ff32 /kernel/signal.c | |
| parent | 7a5e873f096e04e6d8719e4ecb7b70d2decca503 (diff) | |
| download | lwn-80fe728d593e3a048a56610de932919f7d6d968a.tar.gz lwn-80fe728d593e3a048a56610de932919f7d6d968a.zip | |
signals: allow the kernel to actually kill /sbin/init
Currently the buggy /sbin/init hangs if SIGSEGV/etc happens. The kernel sends
the signal, init dequeues it and ignores, returns from the exception, repeats
the faulting instruction, and so on forever.
Imho, such a behaviour is not good. I think that the explicit loud death of
the buggy /sbin/init is better than the silent hang.
Change force_sig_info() to clear SIGNAL_UNKILLABLE when the task should be
really killed.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/signal.c')
| -rw-r--r-- | kernel/signal.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 646a8765696a..9ac737e53df1 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -892,7 +892,8 @@ specific_send_sig_info(int sig, struct siginfo *info, struct task_struct *t) * since we do not want to have a signal handler that was blocked * be invoked when user space had explicitly blocked it. * - * We don't want to have recursive SIGSEGV's etc, for example. + * We don't want to have recursive SIGSEGV's etc, for example, + * that is why we also clear SIGNAL_UNKILLABLE. */ int force_sig_info(int sig, struct siginfo *info, struct task_struct *t) @@ -912,6 +913,8 @@ force_sig_info(int sig, struct siginfo *info, struct task_struct *t) recalc_sigpending_and_wake(t); } } + if (action->sa.sa_handler == SIG_DFL) + t->signal->flags &= ~SIGNAL_UNKILLABLE; ret = specific_send_sig_info(sig, info, t); spin_unlock_irqrestore(&t->sighand->siglock, flags); |