linux-kernel - [34-longterm 144/260] drivers/video/via/ioctl.c: prevent reading uninitialized stack memory

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Message-Id: <1293952756-15010-145-git-send-email-paul.gortmaker@windriver.com>
Date:	Sun,  2 Jan 2011 02:17:20 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Dan Rosenberg <drosenberg@...curity.com>,
	Dan Rosenberg <dan.j.rosenberg@...il.com>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 144/260] drivers/video/via/ioctl.c: prevent reading uninitialized stack memory

From: Dan Rosenberg <drosenberg@...curity.com>

commit b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca upstream.

The VIAFB_GET_INFO device ioctl allows unprivileged users to read 246
bytes of uninitialized stack memory, because the "reserved" member of
the viafb_ioctl_info struct declared on the stack is not altered or
zeroed before being copied back to the user.  This patch takes care of
it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@...il.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/video/via/ioctl.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/video/via/ioctl.c b/drivers/video/via/ioctl.c
index da03c07..4d553d0 100644
--- a/drivers/video/via/ioctl.c
+++ b/drivers/video/via/ioctl.c
@@ -25,6 +25,8 @@ int viafb_ioctl_get_viafb_info(u_long arg)
 {
 	struct viafb_ioctl_info viainfo;
 
+	memset(&viainfo, 0, sizeof(struct viafb_ioctl_info));
+
 	viainfo.viafb_id = VIAID;
 	viainfo.vendor_id = PCI_VIA_VENDOR_ID;
 
-- 
1.7.3.3

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