linux-kernel - Re: [syzbot] [overlayfs?] KASAN: invalid-free in ovl_copy_up

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Message-ID: <CAG48ez2UkCR7LMaQfCQVLW4VOZG9CuPDMHG7cBtaAitM=zPBCg@mail.gmail.com>
Date:   Fri, 24 Nov 2023 16:11:54 +0100
From:   Jann Horn <jannh@...gle.com>
To:     amir73il@...il.com,
        syzbot <syzbot+477d8d8901756d1cbba1@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-unionfs@...r.kernel.org, miklos@...redi.hu,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [overlayfs?] KASAN: invalid-free in ovl_copy_up_one

On Wed, Sep 27, 2023 at 5:10 PM syzbot
<syzbot+477d8d8901756d1cbba1@...kaller.appspotmail.com> wrote:
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+477d8d8901756d1cbba1@...kaller.appspotmail.com
>
> Tested on:
>
> commit:         8e9b46c4 ovl: do not encode lower fh with upper sb_wri..
> git tree:       https://github.com/amir73il/linux.git ovl_want_write
> console output: https://syzkaller.appspot.com/x/log.txt?x=10d10ffa680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bb54ecdfa197f132
> dashboard link: https://syzkaller.appspot.com/bug?extid=477d8d8901756d1cbba1
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

It looks like the fix was submitted without the Reported-by tag, so
syzkaller doesn't recognize that the fix has landed... I'll tell
syzkaller now which commit the fix is supposed to be in, please
correct me if this is wrong:

#syz fix: ovl: do not encode lower fh with upper sb_writers held