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[GIT pull] core fix for 4.11

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  [GIT pull] core fix for 4.11 Thomas Gleixner <tglx@linutronix.de> - 2017-04-02 09:30 +0200

#1614648 — [GIT pull] core fix for 4.11

Linus,

please pull the latest core-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core-urgent-for-linus

Prevent leaking kernel memory via /proc/$pid/syscall when the queried task
is not in a syscall.

Thanks,

	tglx

------------------>
Kees Cook (1):
      lib/syscall: Clear return values when no stack


 lib/syscall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/syscall.c b/lib/syscall.c
index 17d5ff5fa6a3..2c6cd1b5c3ea 100644
--- a/lib/syscall.c
+++ b/lib/syscall.c
@@ -12,6 +12,7 @@ static int collect_syscall(struct task_struct *target, long *callno,
 
 	if (!try_get_task_stack(target)) {
 		/* Task has no stack, so the task isn't in a syscall. */
+		*sp = *pc = 0;
 		*callno = -1;
 		return 0;
 	}

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