linux-kernel - [PATCH] infoleak fix3 in timer

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Message-Id: <1462308272-6260-1-git-send-email-kjlu@gatech.edu>
Date:	Tue,  3 May 2016 16:44:32 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	perex@...ex.cz
Cc:	tiwai@...e.com, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org, taesoo@...ech.edu, insu@...ech.edu,
	Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] infoleak fix3 in timer

The stack object “r1” has a total size of 32 bytes. Its field
“event” and “val” both contain 4 bytes padding. These 8 bytes
padding bytes are sent to user without being initialized.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
---
 sound/core/timer.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/core/timer.c b/sound/core/timer.c
index e98fa5f..c69a271 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -1268,6 +1268,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
 	}
 	if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
 	    tu->last_resolution != resolution) {
+		memset(&r1, 0, sizeof(r1));
 		r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
 		r1.tstamp = tstamp;
 		r1.val = resolution;
-- 
1.9.1