From: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Date: Tue, 11 Oct 2016 13:02:47 +0000 (+0200)
Subject: drivers/ptp: Fix kernel memory disclosure
X-Git-Tag: v4.9-rc1~28^2~16
X-Git-Url: http://git.cascardo.info/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=02a9079c66341836c4914c33c06a73245060df2e

drivers/ptp: Fix kernel memory disclosure

The reserved field precise_offset->rsv is not cleared before being
copied to user space, leaking kernel stack memory. Clear the struct
before it's copied.

Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/ptp/ptp_chardev.c b/drivers/ptp/ptp_chardev.c
index d637c933c8a9..58a97d420572 100644
--- a/drivers/ptp/ptp_chardev.c
+++ b/drivers/ptp/ptp_chardev.c
@@ -193,6 +193,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		if (err)
 			break;
 
+		memset(&precise_offset, 0, sizeof(precise_offset));
 		ts = ktime_to_timespec64(xtstamp.device);
 		precise_offset.device.sec = ts.tv_sec;
 		precise_offset.device.nsec = ts.tv_nsec;