linux-kernel - Re: WARNING: kmalloc bug in bpf_prog_array_copy

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Message-ID: <146902fb-3f03-b8dd-1c3c-88fcdeb6e2af@iogearbox.net>
Date:   Wed, 14 Feb 2018 15:40:06 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     syzbot <syzbot+cab5816b0edbabf598b3@...kaller.appspotmail.com>,
        ast@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: WARNING: kmalloc bug in bpf_prog_array_copy_info

On 02/14/2018 01:36 PM, Daniel Borkmann wrote:
> On 02/14/2018 12:59 AM, syzbot wrote:
>> Hello,
>>
>> syzbot hit the following crash on bpf-next commit
>> 7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (Sun Feb 11 23:04:29 2018 +0000)
>> Linux 4.16-rc1
>>
>> So far this crash happened 362 times on bpf-next.
>> C reproducer is attached.
>> syzkaller reproducer is attached.
>> Raw console output is attached.
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached.
> 
> Will send a fix for this in a bit.

(http://patchwork.ozlabs.org/patch/873373/)

#syz fix: bpf: fix bpf_prog_array_copy_to_user warning from perf event prog query