Commit 9943d3ac authored Jul 24, 2017 by Eric W. Biederman

signal: Clear si_sys_private before copying siginfo to userspace



In preparation for unconditionally copying the whole of siginfo
to userspace clear si_sys_private.  So this kernel internal
value is guaranteed not to make it to userspace.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

parent aba1be2f

kernel/signal.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -643,6 +643,9 @@ int dequeue_signal(struct task_struct tsk, sigset_t mask, siginfo_t *info)
		spin_unlock(&tsk->sighand->siglock);
		posixtimer_rearm(info);
		spin_lock(&tsk->sighand->siglock);

		/* Don't expose the si_sys_private value to userspace */
		info->si_sys_private = 0;
		}
		#endif
		return signr;