linux-kernel - Re: KASAN: use-after-free Read in path

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Message-ID: <CAHk-=wiLW+b=r=z3fYGY58WV+qu2qW6Q0_K30Qat0-74-iwvJg@mail.gmail.com>
Date:   Sun, 24 Mar 2019 18:25:30 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     syzbot <syzbot+7a8ba368b47fdefca61e@...kaller.appspotmail.com>
Cc:     dledford@...hat.com, Christoph Hellwig <hch@....de>,
        Leon Romanovsky <leonro@...lanox.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: KASAN: use-after-free Read in path_lookupat

On Sun, Mar 24, 2019 at 5:44 PM syzbot
<syzbot+7a8ba368b47fdefca61e@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit a435393acafbf0ecff4deb3e3cb554b34f0d0664

That's wrong. It might change some timing or something to make the
race hit, but it looks entirely unrelated to the bpf path_lookupat
problem.

                 Linus