linux-kernel - Re: [PATCH v5 00/17] objtool: vmlinux.o and noinstr validation

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Message-ID: <alpine.LSU.2.21.2004171432360.7737@pobox.suse.cz>
Date:   Fri, 17 Apr 2020 14:33:24 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Peter Zijlstra <peterz@...radead.org>
cc:     tglx@...utronix.de, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org, x86@...nel.org, mhiramat@...nel.org,
        jthierry@...hat.com, alexandre.chartre@...cle.com
Subject: Re: [PATCH v5 00/17] objtool: vmlinux.o and noinstr validation

On Thu, 16 Apr 2020, Peter Zijlstra wrote:

> As should be familiar by now; these patches implement the noinstr
> (no-instrument) validation in objtool as requested by Thomas, to ensure
> critical code (entry for now, idle later) run no unexpected code.
> 
> Functions are marked with: noinstr, which implies notrace, noinline and sticks
> things in the .noinstr.text section. Such functions can then use instr_begin()
> and instr_end() to allow calls to code outside of this section in sanctioned
> areas.
> 
> On the way of getting there, it also fixes the x86/ftrace trampiline ORC
> unwind.

I think I've already done that, but there are some changes, so

Reviewed-by: Miroslav Benes <mbenes@...e.cz>

M