linux-kernel - [ 018/143] b43: stop format string leaking into error msgs

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Message-Id: <20140512003201.386871159@1wt.eu>
Date:	Mon, 12 May 2014 02:32:18 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Kees Cook <keescook@...omium.org>,
	"John W. Linville" <linville@...driver.com>,
	Willy Tarreau <w@....eu>
Subject: [ 018/143] b43: stop format string leaking into error msgs

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Kees Cook <keescook@...omium.org>

commit e0e29b683d6784ef59bbc914eac85a04b650e63c upstream

The module parameter "fwpostfix" is userspace controllable, unfiltered,
and is used to define the firmware filename. b43_do_request_fw() populates
ctx->errors[] on error, containing the firmware filename. b43err()
parses its arguments as a format string. For systems with b43 hardware,
this could lead to a uid-0 to ring-0 escalation.

CVE-2013-2852

Signed-off-by: Kees Cook <keescook@...omium.org>
Cc: stable@...r.kernel.org
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/net/wireless/b43/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 94dae56..3cf2472 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2257,7 +2257,7 @@ static int b43_request_firmware(struct b43_wldev *dev)
 	for (i = 0; i < B43_NR_FWTYPES; i++) {
 		errmsg = ctx->errors[i];
 		if (strlen(errmsg))
-			b43err(dev->wl, errmsg);
+			b43err(dev->wl, "%s", errmsg);
 	}
 	b43_print_fw_helptext(dev->wl, 1);
 	err = -ENOENT;
-- 
1.7.12.2.21.g234cd45.dirty



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