linux-ext4 - [Bug 199977] ext4: use-after-free() detected by KASAN when mounting and operating a crafted ext4 image

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Message-ID: <bug-199977-13602-Ny7uYgBvbx@https.bugzilla.kernel.org/>
Date:   Wed, 13 Jun 2018 16:16:40 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 199977] ext4: use-after-free() detected by KASAN when mounting
 and operating a crafted ext4 image

https://bugzilla.kernel.org/show_bug.cgi?id=199977

--- Comment #7 from Wen Xu (wen.xu@...ech.edu) ---
(In reply to Theodore Tso from comment #6)
> OK, so based on that, I'll treat #199977 as the original simplified poc.c
> and image.  In which case it should be a dup of one of your other older,
> closed bugs.
> 
> I'll also then mark #199997 as a dup of #200001, which is fixed via the two
> patches I sent out for review.  (There is also a discussion on that thread
> about how we should fix the more general problem of block type confusion and
> verification.)
> 
> With these two patches, as far as I can tell we've cleared all of the bugs
> you've opened relating to extended attributes, with the possible exception
> of #20005, which is related to inline data, but which may also have some
> relationship to ext4's xattr codepaths.

Got it. I will also do some fuzzing tests on xattr again once the patches are
committed. Thanks.

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