linux-kernel - Re: v4.18-rc4: slab-out-of-bounds in ___bpf_prog

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Message-ID: <ab5caede-dc95-8417-551e-fedf0b7da4a7@iogearbox.net>
Date:   Mon, 9 Jul 2018 15:34:41 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: v4.18-rc4: slab-out-of-bounds in ___bpf_prog_run

On 07/09/2018 02:35 PM, Mark Rutland wrote:
> Hi,
> 
> While fuzzing v4.18-rc4 with Syzkaller, I hit a KASAN slab-out-of-bounds
> warning at ___bpf_prog_run+0x1f20 (splat at the end of this mail), which
> faddr2line tells me is kernel/bpf/core.c:1303.
> 
> I can reliably trigger this with the below C program, which I minimized from
> Syzkaller's auto-generated C reproducer.

Thanks Mark! Looking into it.