linux-kernel - Re: [syzbot] [xfs?] UBSAN: array-index-out-of-bounds in xfs_attr3_leaf_add

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Message-ID: <202309301334.FA4D7752@keescook>
Date:   Sat, 30 Sep 2023 13:35:32 -0700
From:   Kees Cook <keescook@...omium.org>
To:     syzbot <syzbot+510dcbdc6befa1e6b2f6@...kaller.appspotmail.com>
Cc:     chandan.babu@...cle.com, david@...morbit.com, djwong@...nel.org,
        ebiggers@...nel.org, hch@....de, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        mukattreyee@...il.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [xfs?] UBSAN: array-index-out-of-bounds in
 xfs_attr3_leaf_add_work

On Sat, Sep 30, 2023 at 10:57:28AM -0700, syzbot wrote:
> syzbot suspects this issue was fixed by commit:
> 
> commit a49bbce58ea90b14d4cb1d00681023a8606955f2
> Author: Darrick J. Wong <djwong@...nel.org>
> Date:   Mon Jul 10 16:12:20 2023 +0000
> 
>     xfs: convert flex-array declarations in xfs attr leaf blocks
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12eef28a680000
> start commit:   f8566aa4f176 Merge tag 'x86-urgent-2023-07-01' of git://gi..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3f27fb02fc20d955
> dashboard link: https://syzkaller.appspot.com/bug?extid=510dcbdc6befa1e6b2f6
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1652938f280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14c10c40a80000
> 
> If the result looks correct, please mark the issue as fixed by replying with:

Yup, that tracks. :)

#syz fix: xfs: convert flex-array declarations in xfs attr leaf blocks

-Kees

> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

-- 
Kees Cook