linux-ext4 - [Bug 205609] Multiple bugs in __ext4_expand_extra

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Message-ID: <bug-205609-13602-cx13eaOmDi@https.bugzilla.kernel.org/>
Date:   Mon, 25 Nov 2019 10:09:07 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 205609] Multiple bugs in __ext4_expand_extra_isize (OOB write
 and UAF write)

https://bugzilla.kernel.org/show_bug.cgi?id=205609

--- Comment #6 from Tristan (tristmd@...il.com) ---
Dear  Theodore,

- Looks like syzkaller bot have found the UAF too. 

- The OOB write's path is different to be triggered (check the stack trace) but
the root cause seems to be similar at the end

- I am running syzkaller by myself 

- I will work on the dev branch of the ext4.git tree as suggested

- At this time, I think the commit "ext4: add more paranoia checking in
ext4_expand_extra_isize handling" should have fixed both issues but I can
verify

Thanks.

Kind regards,

Tristan

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