linux-kernel - Re: [syzbot] [ntfs3?] BUG: unable to handle kernel paging request in mi_enum

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Date:   Mon, 6 Feb 2023 11:09:57 +0100
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     syzbot <syzbot+28207acc70bbf3d85b74@...kaller.appspotmail.com>
Cc:     almaz.alexandrovich@...agon-software.com,
        linux-kernel@...r.kernel.org, ntfs3@...ts.linux.dev,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] BUG: unable to handle kernel paging request in mi_enum_attr

On Sat, Feb 4, 2023 at 2:56 PM syzbot
<syzbot+28207acc70bbf3d85b74@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 0e8235d28f3a0e9eda9f02ff67ee566d5f42b66b
> Author: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
> Date:   Mon Oct 10 10:15:33 2022 +0000
>
>     fs/ntfs3: Check fields while reading
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13c11ba5480000
> start commit:   f9ff5644bcc0 Merge tag 'hsi-for-6.2' of git://git.kernel.o..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c163713cf9186fe7
> dashboard link: https://syzkaller.appspot.com/bug?extid=28207acc70bbf3d85b74
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1275aed7880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=124f533b880000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: fs/ntfs3: Check fields while reading

The reproducer was mostly triggering a KASAN: use-after-free in
mi_enum_attr error and the patch indeed looks like the one that could
have fixed this problem.
Let's close the bug, if `unable to handle kernel paging request in
mi_enum_attr` is still not fixed, it will pop up again.

#syz fix: fs/ntfs3: Check fields while reading

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