Return-Path: Message-Id: <20140512003201.386871159@1wt.eu> Date: Mon, 12 May 2014 02:32:18 +0200 From: Willy Tarreau To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Kees Cook , "John W. Linville" , Willy Tarreau Subject: [ 018/143] b43: stop format string leaking into error msgs In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org List-ID: 2.6.32-longterm review patch. If anyone has any objections, please let me know. ------------------ From: Kees Cook 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 Cc: stable@vger.kernel.org Signed-off-by: John W. Linville Signed-off-by: Willy Tarreau --- 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