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mqueue: reject mq_notify with signo 0

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valid_signal(0) is true; __do_notify() skips signo 0 anyway.

Signed-off-by: Yi Xie <xieyi@kylinos.cn>
Link: https://patch.msgid.link/20260603020936.54508-1-xieyi@kylinos.cn
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Yi Xie
2026-06-03 10:09:36 +08:00
committed by Christian Brauner
parent dc59e4fea9
commit 1184f5e820
1 changed files with 2 additions and 3 deletions
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5
ipc/mqueue.c
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@@ -790,7 +790,6 @@ static void __do_notify(struct mqueue_inode_info *info)
struct kernel_siginfo sig_i;
struct task_struct *task;
/* do_mq_notify() accepts sigev_signo == 0, why?? */
if (!info->notify.sigev_signo)
break;
@@ -1281,9 +1280,9 @@ static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification)
notification->sigev_notify != SIGEV_THREAD))
return -EINVAL;
if (notification->sigev_notify == SIGEV_SIGNAL &&
!valid_signal(notification->sigev_signo)) {
(!notification->sigev_signo ||
!valid_signal(notification->sigev_signo)))
return -EINVAL;
}
if (notification->sigev_notify == SIGEV_THREAD) {
long timeo;