linux-kernel - Re: [syzbot] WARNING: kmalloc bug in bpf

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Date:   Sat, 23 Apr 2022 14:13:41 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+cecf5b7071a0dfb76530@...kaller.appspotmail.com>
Cc:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, hawk@...nel.org,
        jiri@...dia.com, john.fastabend@...il.com, kafai@...com,
        kpsingh@...nel.org, kuba@...nel.org, leonro@...dia.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, yhs@...com
Subject: Re: [syzbot] WARNING: kmalloc bug in bpf

On Fri, 22 Apr 2022 at 20:53, syzbot
<syzbot+cecf5b7071a0dfb76530@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 0708a0afe291bdfe1386d74d5ec1f0c27e8b9168
> Author: Daniel Borkmann <daniel@...earbox.net>
> Date:   Fri Mar 4 14:26:32 2022 +0000
>
>     mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1499c6fcf00000
> start commit:   1d5a47424040 sfc: The RX page_ring is optional
> git tree:       net
> kernel config:  https://syzkaller.appspot.com/x/.config?x=1a86c22260afac2f
> dashboard link: https://syzkaller.appspot.com/bug?extid=cecf5b7071a0dfb76530
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=176738e7b00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13b4508db00000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Looks reasonable:

#syz fix: mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls