linux-kernel - Re: [PATCH v2 0/2] x86/retpoline,kprobes: Fix the [__indirect_thunk

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Date:   Sun, 30 Jul 2023 00:14:35 +0900
From:   Masami Hiramatsu (Google) <mhiramat@...nel.org>
To:     Petr Pavlu <petr.pavlu@...e.com>
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, peterz@...radead.org,
        samitolvanen@...gle.com, x86@...nel.org,
        linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] x86/retpoline,kprobes: Fix the
 [__indirect_thunk_start, ..end] range

Hi Peter,

Can you pick this series to tip tree?
I think, these affect to x86 arch code.

Thank you,

On Tue, 11 Jul 2023 11:19:50 +0200
Petr Pavlu <petr.pavlu@...e.com> wrote:

> Fix problems with an output position of thunk sections and the
> associated definition of range [__indirect_thunk_start,
> __indirect_thunk_end] which affects the kprobes optimization.
> 
> Initial v1 of the series kept the mentioned range but it turns out the
> logic which uses it is not necessary so it is removed altogether.
> 
> Changes since v1 [1]:
> - Drop the patch which moved the return thunk out of
>   [__indirect_thunk_start, ..end] and instead replace it with a removal
>   of the kprobes optimization check which looked for calls to indirect
>   thunks.
> - Slightly adjust the commit message for the first patch, to better
>   match the new second patch.
> 
> [1] https://lore.kernel.org/lkml/20230705081547.25130-1-petr.pavlu@suse.com/
> 
> Petr Pavlu (2):
>   x86/retpoline,kprobes: Fix position of thunk sections with
>     CONFIG_LTO_CLANG
>   x86/retpoline,kprobes: Skip optprobe check for indirect jumps with
>     retpolines and IBT
> 
>  arch/x86/include/asm/nospec-branch.h |  3 ---
>  arch/x86/kernel/kprobes/opt.c        | 40 +++++++++++-----------------
>  arch/x86/kernel/vmlinux.lds.S        |  4 +--
>  arch/x86/lib/retpoline.S             |  4 +--
>  tools/perf/util/thread-stack.c       |  4 +--
>  5 files changed, 20 insertions(+), 35 deletions(-)
> 
> -- 
> 2.35.3
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>