From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 5.4 40/84] slcan: Don't transmit uninitialized stack data in padding Date: Wed, 15 Apr 2020 07:43:57 -0400 Message-ID: <20200415114442.14166-40-sashal@kernel.org> References: <20200415114442.14166-1-sashal@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Received: from mail.kernel.org ([198.145.29.99]:39278 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409177AbgDOLpb (ORCPT ); Wed, 15 Apr 2020 07:45:31 -0400 In-Reply-To: <20200415114442.14166-1-sashal@kernel.org> Sender: linux-can-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Richard Palethorpe , Kees Cook , linux-can@vger.kernel.org, netdev@vger.kernel.org, security@kernel.org, wg@grandegger.com, mkl@pengutronix.de, davem@davemloft.net, Sasha Levin From: Richard Palethorpe [ Upstream commit b9258a2cece4ec1f020715fe3554bc2e360f6264 ] struct can_frame contains some padding which is not explicitly zeroed in slc_bump. This uninitialized data will then be transmitted if the stack initialization hardening feature is not enabled (CONFIG_INIT_STACK_ALL). This commit just zeroes the whole struct including the padding. Signed-off-by: Richard Palethorpe Fixes: a1044e36e457 ("can: add slcan driver for serial/USB-serial CAN adapters") Reviewed-by: Kees Cook Cc: linux-can@vger.kernel.org Cc: netdev@vger.kernel.org Cc: security@kernel.org Cc: wg@grandegger.com Cc: mkl@pengutronix.de Cc: davem@davemloft.net Acked-by: Marc Kleine-Budde Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/can/slcan.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/net/can/slcan.c b/drivers/net/can/slcan.c index a3664281a33fc..4dfa459ef5c73 100644 --- a/drivers/net/can/slcan.c +++ b/drivers/net/can/slcan.c @@ -148,7 +148,7 @@ static void slc_bump(struct slcan *sl) u32 tmpid; char *cmd = sl->rbuff; - cf.can_id = 0; + memset(&cf, 0, sizeof(cf)); switch (*cmd) { case 'r': @@ -187,8 +187,6 @@ static void slc_bump(struct slcan *sl) else return; - *(u64 *) (&cf.data) = 0; /* clear payload */ - /* RTR frames may have a dlc > 0 but they never have any data bytes */ if (!(cf.can_id & CAN_RTR_FLAG)) { for (i = 0; i < cf.can_dlc; i++) { -- 2.20.1