linux-kernel - Re: [syzbot] KASAN: use-after-free Read in mas_next

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Date:   Thu, 26 Jan 2023 08:14:24 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     syzbot <syzbot+7170d66493145b71afd4@...kaller.appspotmail.com>
Cc:     brauner@...nel.org, dan.carpenter@...cle.com, dvyukov@...gle.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org,
        viro@...iv.linux.org.uk, wanjiabing@...o.com, willy@...radead.org
Subject: Re: [syzbot] KASAN: use-after-free Read in mas_next_nentry

syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister() 

* syzbot <syzbot+7170d66493145b71afd4@...kaller.appspotmail.com> [230125 17:04]:
> syzbot suspects this issue was fixed by commit:
> 
> commit 59f2f4b8a757412fce372f6d0767bdb55da127a8
> Author: Liam Howlett <liam.howlett@...cle.com>
> Date:   Mon Nov 7 20:11:42 2022 +0000
> 
>     fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=129e8afe480000
> start commit:   b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11bfb2a9880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b1d319880000
> 
> If the result looks correct, please mark the issue as fixed by replying with:
> 
> #syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection