This is a note to let you know that I've just added the patch titled
sched/rt: pick_next_rt_entity(): check list_entry
to the 4.19-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:
sched-rt-pick_next_rt_entity-check-list_entry.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7c4a5b89a0b5a57a64b601775b296abf77a9fe97 Mon Sep 17 00:00:00 2001
From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Date: Mon, 6 Feb 2023 22:33:54 +0000
Subject: sched/rt: pick_next_rt_entity(): check list_entry
From: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
commit 7c4a5b89a0b5a57a64b601775b296abf77a9fe97 upstream.
Commit 326587b84078 ("sched: fix goto retry in pick_next_task_rt()")
removed any path which could make pick_next_rt_entity() return NULL.
However, BUG_ON(!rt_se) in _pick_next_task_rt() (the only caller of
pick_next_rt_entity()) still checks the error condition, which can
never happen, since list_entry() never returns NULL.
Remove the BUG_ON check, and instead emit a warning in the only
possible error condition here: the queue being empty which should
never happen.
Fixes: 326587b84078 ("sched: fix goto retry in pick_next_task_rt()")
Signed-off-by: Pietro Borrello <borrello@xxxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Phil Auld <pauld@xxxxxxxxxx>
Reviewed-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230128-list-entry-null-check-sched-v3-1-b1a71bd1ac6b@xxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
[ Fixes CVE-2023-1077: sched/rt: pick_next_rt_entity(): check list_entry
An insufficient list empty checking in pick_next_rt_entity(). The
_pick_next_task_rt() checks pick_next_rt_entity() returns NULL or not
but pick_next_rt_entity() never returns NULL. So, even if the list is
empty, _pick_next_task_rt() continues its process. ]
Signed-off-by: Srish Srinivasan <ssrish@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/sched/rt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1522,6 +1522,8 @@ static struct sched_rt_entity *pick_next
BUG_ON(idx >= MAX_RT_PRIO);
queue = array->queue + idx;
+ if (SCHED_WARN_ON(list_empty(queue)))
+ return NULL;
next = list_entry(queue->next, struct sched_rt_entity, run_list);
return next;
@@ -1535,7 +1537,8 @@ static struct task_struct *_pick_next_ta
do {
rt_se = pick_next_rt_entity(rq, rt_rq);
- BUG_ON(!rt_se);
+ if (unlikely(!rt_se))
+ return NULL;
rt_rq = group_rt_rq(rt_se);
} while (rt_rq);
Patches currently in stable-queue which might be from borrello@xxxxxxxxxxxxxxxx are
queue-4.19/sched-rt-pick_next_rt_entity-check-list_entry.patch
