[PATCH AUTOSEL 4.4 07/14] slcan: Don't transmit uninitialized stack data in padding

From: Sasha Levin
Date: Wed Apr 15 2020 - 08:03:45 EST


From: Richard Palethorpe <rpalethorpe@xxxxxxxx>

[ 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 <rpalethorpe@xxxxxxxx>
Fixes: a1044e36e457 ("can: add slcan driver for serial/USB-serial CAN adapters")
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: linux-can@xxxxxxxxxxxxxxx
Cc: netdev@xxxxxxxxxxxxxxx
Cc: security@xxxxxxxxxx
Cc: wg@xxxxxxxxxxxxxx
Cc: mkl@xxxxxxxxxxxxxx
Cc: davem@xxxxxxxxxxxxx
Acked-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 27f42763eaf5a..5bacb019ec1f8 100644
--- a/drivers/net/can/slcan.c
+++ b/drivers/net/can/slcan.c
@@ -147,7 +147,7 @@ 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':
@@ -186,8 +186,6 @@ 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