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From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Fri, 30 Jun 2023 12:18:01 +0200
Message-ID: <CAMj1kXFrsc7bsjo2i0=9AqVNSCvXEnYAukzoXeaYEH9EpNviBA@mail.gmail.com>
Subject: Re: [PATCH] net: tls: enable __GFP_ZERO upon tls_init()
To:     Alexander Potapenko <glider@google.com>
Cc:     Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
        Boris Pismenny <borisp@nvidia.com>,
        John Fastabend <john.fastabend@gmail.com>,
        Jakub Kicinski <kuba@kernel.org>, herbert@gondor.apana.org.au,
        linux-crypto@vger.kernel.org, syzkaller-bugs@googlegroups.com,
        syzbot <syzbot+828dfc12440b4f6f305d@syzkaller.appspotmail.com>,
        Eric Biggers <ebiggers@kernel.org>,
        Aviad Yehezkel <aviadye@nvidia.com>,
        Daniel Borkmann <daniel@iogearbox.net>, netdev@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>
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On Fri, 30 Jun 2023 at 12:11, Alexander Potapenko <glider@google.com> wrote=
:
>
> On Fri, Jun 30, 2023 at 12:02=E2=80=AFPM Ard Biesheuvel <ardb@kernel.org>=
 wrote:
> >
> > On Fri, 30 Jun 2023 at 11:53, Tetsuo Handa
> > <penguin-kernel@i-love.sakura.ne.jp> wrote:
> > >
> > > On 2023/06/30 18:36, Ard Biesheuvel wrote:
> > > > Why are you sending this now?
> > >
> > > Just because this is currently top crasher and I can reproduce locall=
y.
> > >
> > > > Do you have a reproducer for this issue?
> > >
> > > Yes. https://syzkaller.appspot.com/text?tag=3DReproC&x=3D129316219000=
00 works.
> > >
> >
> > Could you please share your kernel config and the resulting kernel log
> > when running the reproducer? I'll try to reproduce locally as well,
> > and see if I can figure out what is going on in the crypto layer
>
> The config together with the repro is available at
> https://syzkaller.appspot.com/bug?extid=3D828dfc12440b4f6f305d, see the
> latest row of the "Crashes" table that contains a C repro.

Could you explain why that bug contains ~50 reports that seem entirely
unrelated? AIUI, this actual issue has not been reproduced since
2020??


> Config: https://syzkaller.appspot.com/text?tag=3DKernelConfig&x=3Dee5f7a0=
b2e48ed66
> Report: https://syzkaller.appspot.com/text?tag=3DCrashReport&x=3D1325260d=
900000
> Syz repro: https://syzkaller.appspot.com/text?tag=3DReproSyz&x=3D11af973e=
900000
> C repro: https://syzkaller.appspot.com/text?tag=3DReproC&x=3D163a1e459000=
00
>
> The bug is reproducible for me locally as well (and Tetsuo's patch
> makes it disappear, although I have no opinion on its correctness).

What I'd like to do is run a kernel plus initrd locally in OVMF and
reproduce the issue - can I do that without all the syzkaller
machinery?