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| author | Eric W. Biederman <ebiederm@xmission.com> | 2018-09-03 09:50:36 +0200 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-09-11 21:19:28 +0200 |
| commit | f149b31557446aff9ca96d4be7e39cc266f6e7cc (patch) | |
| tree | 2fcd6f912dbde8435daa1932569fc25697894d10 | |
| parent | 035150540545f62bada95860ba00fe1e0cd62f63 (diff) | |
| download | linux-f149b31557446aff9ca96d4be7e39cc266f6e7cc.tar.bz2 | |
signal: Never allocate siginfo for SIGKILL or SIGSTOP
The SIGKILL and SIGSTOP signals are never delivered to userspace so
queued siginfo for these signals can never be observed. Therefore
remove the chance of failure by never even attempting to allocate
siginfo in those cases.
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
| -rw-r--r-- | kernel/signal.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/signal.c b/kernel/signal.c index 20931a892ace..d7d1adf735f4 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1054,10 +1054,11 @@ static int __send_signal(int sig, struct siginfo *info, struct task_struct *t, result = TRACE_SIGNAL_DELIVERED; /* - * fast-pathed signals for kernel-internal things like SIGSTOP - * or SIGKILL. + * Skip useless siginfo allocation for SIGKILL SIGSTOP, + * and kernel threads. */ - if ((info == SEND_SIG_FORCED) || (t->flags & PF_KTHREAD)) + if ((info == SEND_SIG_FORCED) || + sig_kernel_only(sig) || (t->flags & PF_KTHREAD)) goto out_set; /* |