linux-kernel - Re: [PATCH bpf v2 0/3] bpf: invalidate unused part of bpf_prog

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Message-ID: <FF2E0EC1-F9D6-4196-8887-919207BDC599@fb.com>
Date:   Wed, 27 Apr 2022 22:10:29 +0000
From:   Song Liu <songliubraving@...com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
CC:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        Christoph Hellwig <hch@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Song Liu <song@...nel.org>
Subject: Re: [PATCH bpf v2 0/3] bpf: invalidate unused part of bpf_prog_pack

Hi Linus,

> On Apr 25, 2022, at 1:39 PM, Song Liu <song@...nel.org> wrote:
> 
> Note: while prefixed with "bpf", this set is based on Linus' master branch.
> 
> This is v2 of [1]. It is revised based on Peter's feedback. The patch is
> also split into 3.
> 
> [1] https://lore.kernel.org/linux-mm/20220421072212.608884-1-song@kernel.org/

Could you please share your suggestions on this set? Shall we ship it 
with 5.18?

Thanks,
Song

> 
> Song Liu (3):
>  bpf: fill new bpf_prog_pack with illegal instructions
>  x86/alternative: introduce text_poke_set
>  bpf: introduce bpf_arch_text_invalidate for bpf_prog_pack
> 
> arch/x86/include/asm/text-patching.h |  1 +
> arch/x86/kernel/alternative.c        | 70 ++++++++++++++++++++++++----
> arch/x86/net/bpf_jit_comp.c          |  5 ++
> include/linux/bpf.h                  |  1 +
> kernel/bpf/core.c                    | 18 +++++--
> 5 files changed, 81 insertions(+), 14 deletions(-)
> 
> --
> 2.30.2