| From | Luis Henriques <> | Subject | [PATCH 72/93] b43: stop format string leaking into error msgs | Date | Tue, 18 Jun 2013 12:43:20 +0100 |
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3.5.7.15 -stable review patch. If anyone has any objections, please let me know.
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From: Kees Cook <keescook@chromium.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@chromium.org> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- 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 f8fd420..5b349da 100644 --- a/drivers/net/wireless/b43/main.c +++ b/drivers/net/wireless/b43/main.c @@ -2451,7 +2451,7 @@ static void b43_request_firmware(struct work_struct *work) 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); goto out; -- 1.8.1.2
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