On Fri, Dec 16, 2022 at 2:01 PM Lee Jones lee@kernel.org wrote:
On Thu, 15 Dec 2022, Theodore Ts'o wrote:
On Thu, Dec 15, 2022 at 08:34:35AM -0800, syzbot wrote:
This bug is marked as fixed by commit: ext4: block range must be validated before use in ext4_mb_clear_bb() But I can't find it in any tested tree for more than 90 days. Is it a correct commit? Please update it by replying: #syz fix: exact-commit-title Until then the bug is still considered open and new crashes with the same signature are ignored.
I don't know what is going on with syzkaller's commit detection, but commit 1e1c2b86ef86 ("ext4: block range must be validated before use in ext4_mb_clear_bb()") is an exact match for the commit title, and it's been in the upstream kernel since v6.0.
How do we make syzkaller accept this? I'll try this again, but I don't hold out much hope.
I don't see the original bug report (was it posted to a lore associated list?), so there is no way to tell what branch syzbot was fuzzing at the time. My assumption is that it was !Mainline.
Syzbot is actually reacting here to this bug from the Android namespace:
https://syzkaller.appspot.com/bug?id=5266d464285a03cee9dbfda7d2452a72c3c2ae7...
Although this does appear to be a Stable candidate, I do not see it in any of the Stable branches yet. So I suspect the answer here is to wait for the fix to filter down.
In the mean time, I guess we should discuss whether syzbot should really be posting scans of downstream trees to upstream lists.
In this particular case, syzbot has captured all the recipients from the patch email [1], because that email Cc'd syzbot+15cd994e273307bf5cfa@syzkaller.appspotmail.com. To syzbot, all these people were involved in the original bug discussion, and so it notified them about the problem.
FWIW I've sent a PR[2] to make the "I can't find it in any tested tree" message include the link to the syzkaller dashboard. Hopefully it will help resolve such confusions faster.
[1] https://lore.kernel.org/all/20220713185904.64138-1-tadeusz.struk@linaro.org/ [2] https://github.com/google/syzkaller/pull/3591
-- Aleksandr
#syz fix: ext4: block range must be validated before use in ext4_mb_clear_bb()
Syzkaller, go home, you're drunk.
=:-)
-- Lee Jones [李琼斯]
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