35 lines
1.2 KiB
Diff
35 lines
1.2 KiB
Diff
From: Thomas Gleixner <tglx@linutronix.de>
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Date: Fri, 3 Jul 2009 08:29:20 -0500
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Subject: posix-timers: Prevent broadcast signals
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.9-rt7.tar.xz
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Posix timers should not send broadcast signals and kernel only
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signals. Prevent it.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/time/posix-timers.c | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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--- a/kernel/time/posix-timers.c
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+++ b/kernel/time/posix-timers.c
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@@ -507,6 +507,7 @@ static enum hrtimer_restart posix_timer_
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static struct pid *good_sigevent(sigevent_t * event)
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{
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struct task_struct *rtn = current->group_leader;
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+ int sig = event->sigev_signo;
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if ((event->sigev_notify & SIGEV_THREAD_ID ) &&
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(!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) ||
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@@ -515,7 +516,8 @@ static struct pid *good_sigevent(sigeven
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return NULL;
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if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) &&
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- ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX)))
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+ (sig <= 0 || sig > SIGRTMAX || sig_kernel_only(sig) ||
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+ sig_kernel_coredump(sig)))
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return NULL;
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return task_pid(rtn);
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