This is a note to let you know that I've just added the patch titled
net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-sched-taprio-always-validate-tca_taprio_attr_pri.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6c0dbca64e1400cf1049a8a3229fbbf9511de6a4
Author: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Tue Jun 4 18:15:11 2024 +0000
net/sched: taprio: always validate TCA_TAPRIO_ATTR_PRIOMAP
[ Upstream commit f921a58ae20852d188f70842431ce6519c4fdc36 ]
If one TCA_TAPRIO_ATTR_PRIOMAP attribute has been provided,
taprio_parse_mqprio_opt() must validate it, or userspace
can inject arbitrary data to the kernel, the second time
taprio_change() is called.
First call (with valid attributes) sets dev->num_tc
to a non zero value.
Second call (with arbitrary mqprio attributes)
returns early from taprio_parse_mqprio_opt()
and bad things can happen.
Fixes: a3d43c0d56f1 ("taprio: Add support adding an admin schedule")
Reported-by: Noam Rathaus <noamr@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Acked-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Reviewed-by: Vladimir Oltean <vladimir.oltean@xxxxxxx>
Link: https://lore.kernel.org/r/20240604181511.769870-1-edumazet@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/sched/sch_taprio.c b/net/sched/sch_taprio.c
index e4c4d23a1b535..7b896be009d55 100644
--- a/net/sched/sch_taprio.c
+++ b/net/sched/sch_taprio.c
@@ -925,16 +925,13 @@ static int taprio_parse_mqprio_opt(struct net_device *dev,
{
int i, j;
- if (!qopt && !dev->num_tc) {
- NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary");
- return -EINVAL;
- }
-
- /* If num_tc is already set, it means that the user already
- * configured the mqprio part
- */
- if (dev->num_tc)
+ if (!qopt) {
+ if (!dev->num_tc) {
+ NL_SET_ERR_MSG(extack, "'mqprio' configuration is necessary");
+ return -EINVAL;
+ }
return 0;
+ }
/* Verify num_tc is not out of max range */
if (qopt->num_tc > TC_MAX_QUEUE) {
