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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <588e062e-f1aa-6bc5-8011-380be7bf1176@fb.com>
Date:   Tue, 8 Jun 2021 23:24:11 -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 6/8/21 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.

> 
> --
>