linux-kernel - Re: [PATCH -tip v8 10/13] x86/kprobes: Push a fake return address at kretprobe

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Message-Id: <20210709235531.527d5cbb59c5669eed885b32@kernel.org>
Date:   Fri, 9 Jul 2021 23:55:31 +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 10/13] x86/kprobes: Push a fake return address
 at kretprobe_trampoline

On Mon, 5 Jul 2021 10:17:26 +0200
Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
> > +	/* Replace fake return address with real one. */
> > +	*frame_pointer = kretprobe_trampoline_handler(regs, frame_pointer);
> > +	/*
> > +	 * Move flags to sp so that kretprobe_trapmoline can return
> > +	 * right after popf.
> 
> What is a trapmoline?

This means kretprobe_trampoline() code.

> 
> Also, in the x86 code we capitalize register and instruction names so that 
> they are more distinctive and easier to read in the flow of English text.

OK, let me update it.

Thank you,

> 
> Thanks,
> 
> 	Ingo


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