linux-kernel - [PATCH 3.11 059/272] HID: uhid: fix leak for 64/32 UHID

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1386334761-25517-60-git-send-email-luis.henriques@canonical.com>
Date:	Fri,  6 Dec 2013 12:55:48 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	David Herrmann <dh.herrmann@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 059/272] HID: uhid: fix leak for 64/32 UHID_CREATE

3.11.10.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Herrmann <dh.herrmann@...il.com>

commit 80897aa787ecd58eabb29deab7cbec9249c9b7e6 upstream.

UHID allows short writes so user-space can omit unused fields. We
automatically set them to 0 in the kernel. However, the 64/32 bit
compat-handler didn't do that in the UHID_CREATE fallback. This will
reveal random kernel heap data (of random size, even) to user-space.

Fixes: befde0226a59 ('HID: uhid: make creating devices work on 64/32 systems')

Reported-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: David Herrmann <dh.herrmann@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/hid/uhid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 145a4cb..0bb3bb8 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -312,7 +312,7 @@ static int uhid_event_from_user(const char __user *buffer, size_t len,
 			 */
 			struct uhid_create_req_compat *compat;
 
-			compat = kmalloc(sizeof(*compat), GFP_KERNEL);
+			compat = kzalloc(sizeof(*compat), GFP_KERNEL);
 			if (!compat)
 				return -ENOMEM;
 
-- 
1.8.3.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/