linux-kernel - [70/83] b43: stop format string leaking into error msgs

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Message-ID: <lsq.1371420098.723438988@decadent.org.uk>
Date:	Sun, 16 Jun 2013 23:01:38 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Kees Cook" <keescook@...omium.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [70/83] b43: stop format string leaking into error msgs

3.2.47-rc1 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>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/wireless/b43/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2421,7 +2421,7 @@ static int b43_request_firmware(struct b
 	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;

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