linux-kernel - Re: [PATCH -tip v8 02/13] kprobes: treewide: Replace arch_deref_entry_point() with dereference_symbol

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Date:   Mon, 5 Jul 2021 21:03:36 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, X86 ML <x86@...nel.org>,
        Daniel Xu <dxu@...uu.xyz>, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org, kuba@...nel.org, mingo@...hat.com,
        ast@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>, kernel-team@...com,
        yhs@...com, linux-ia64@...r.kernel.org,
        Abhishek Sagar <sagar.abhishek@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>
Subject: Re: [PATCH -tip v8 02/13] kprobes: treewide: Replace
 arch_deref_entry_point() with dereference_symbol_descriptor()

On Mon, 5 Jul 2021 09:48:09 +0200
Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > Replace arch_deref_entry_point() with dereference_symbol_descriptor()
> > because those are doing same thing.
> > 
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > Tested-by: Andrii Nakryik <andrii@...nel.org>
> 
> A better changelog:
> 
>   ~15 years ago kprobes grew the 'arch_deref_entry_point()' __weak function:
> 
>     3d7e33825d87: ("jprobes: make jprobes a little safer for users")
> 
>   But this is just open-coded dereference_symbol_descriptor() in essence, and
>   its obscure nature was causing bugs.
> 
>   Just use the real thing.

OK. BTW, I couldn't find actual bugs from it. What about this?

"its obscure nature was causing problems in the past."

Thank you,

> 
> Thanks,
> 
> 	Ingo


-- 
Masami Hiramatsu <mhiramat@...nel.org>