From: Thomas Gleixner Date: Fri, 3 Jul 2009 08:29:20 -0500 Subject: posix-timers: Prevent broadcast signals Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.14/older/patches-4.14.8-rt9.tar.xz Posix timers should not send broadcast signals and kernel only signals. Prevent it. Signed-off-by: Thomas Gleixner --- kernel/time/posix-timers.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -433,6 +433,7 @@ static enum hrtimer_restart posix_timer_ static struct pid *good_sigevent(sigevent_t * event) { struct task_struct *rtn = current->group_leader; + int sig = event->sigev_signo; switch (event->sigev_notify) { case SIGEV_SIGNAL | SIGEV_THREAD_ID: @@ -442,7 +443,8 @@ static struct pid *good_sigevent(sigeven /* FALLTHRU */ case SIGEV_SIGNAL: case SIGEV_THREAD: - if (event->sigev_signo <= 0 || event->sigev_signo > SIGRTMAX) + if (sig <= 0 || sig > SIGRTMAX || + sig_kernel_only(sig) || sig_kernel_coredump(sig)) return NULL; /* FALLTHRU */ case SIGEV_NONE: