linux-kernel - Re: [PATCH] x86/ibt: Implement FineIBT

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Message-ID: <c561dd8ec384bfc77998a6db6ed824e7@overdrivepizza.com>
Date:   Tue, 18 Oct 2022 13:17:28 -0700
From:   Joao Moreira <joao@...rdrivepizza.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Kees Cook <keescook@...omium.org>, x86@...nel.org,
        Sami Tolvanen <samitolvanen@...gle.com>,
        linux-kernel@...r.kernel.org, Mark Rutland <mark.rutland@....com>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] x86/ibt: Implement FineIBT

> 
>> Tangent: why are these nop instead of 0xcc? These bytes aren't 
>> executed
>> ever are they?
> 
> Because that's what the compiler gets us through 
> -fpatchable-function-entry.

Is it useful to get the compiler to emit 0xcc with 
-fpatchable-function-entry under any circumstance? I can probably change 
that quickly if needed/useful.