netdev - Re: [PATCH bpf 0/2] bpf fix for mixed tail calls and subprograms

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Message-ID: <406c07f4-5137-930d-935b-14e493d2651b@fb.com>
Date:   Wed, 9 Jun 2021 17:13:07 -0700
From:   Yonghong Song <yhs@...com>
To:     John Fastabend <john.fastabend@...il.com>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andriin@...com>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <maciej.fijalkowski@...el.com>
Subject: Re: [PATCH bpf 0/2] bpf fix for mixed tail calls and subprograms



On 6/9/21 9:17 AM, John Fastabend wrote:
> Yonghong Song wrote:
>>
>>
>> On 6/8/21 12:29 PM, John Fastabend wrote:
>>> We recently tried to use mixed programs that have both tail calls and
>>> subprograms, but it needs the attached fix. Also added a small test
>>> addition that will cause the failure without the fix.
>>>
>>> Thanks,
>>> John
>>>
>>> ---
>>>
>>> John Fastabend (2):
>>>         bpf: Fix null ptr deref with mixed tail calls and subprogs
>>>         bpf: selftest to verify mixing bpf2bpf calls and tailcalls with insn patch
>>>
>>>
>>>    .../selftests/bpf/progs/tailcall_bpf2bpf4.c     | 17 +++++++++++++++++
>>>    1 file changed, 17 insertions(+)
>>
>> Don't know what happens. Apparently, the first patch made changes
>> in kernel/bpf/verifier.c, but it didn't show up in the above.
> 
> Agh its how I applied the patches and cover-letter :/ I moved them between
> trees (bpf-next -> bpf) and lost the diff. I can resubmit if anyone
> cares.

You don't need to resubmit just because of this. This cover letter
may not be merged eventually.