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Message-ID: <20190205132507.GS17528@hirez.programming.kicks-ass.net>
Date: Tue, 5 Feb 2019 14:25:07 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Borislav Petkov <bp@...en8.de>
Cc: Rick Edgecombe <rick.p.edgecombe@...el.com>,
Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...hat.com>,
linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
Thomas Gleixner <tglx@...utronix.de>,
Nadav Amit <nadav.amit@...il.com>,
Dave Hansen <dave.hansen@...ux.intel.com>, linux_dti@...oud.com,
linux-integrity@...r.kernel.org,
linux-security-module@...r.kernel.org, akpm@...ux-foundation.org,
kernel-hardening@...ts.openwall.com, linux-mm@...ck.org,
will.deacon@....com, ard.biesheuvel@...aro.org,
kristen@...ux.intel.com, deneen.t.dock@...el.com,
Nadav Amit <namit@...are.com>, Kees Cook <keescook@...omium.org>,
Dave Hansen <dave.hansen@...el.com>,
Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v2 06/20] x86/alternative: use temporary mm for text
poking
On Tue, Feb 05, 2019 at 01:35:33PM +0100, Borislav Petkov wrote:
> On Tue, Feb 05, 2019 at 12:31:46PM +0100, Peter Zijlstra wrote:
> > ...
> >
> > So while in general I agree with BUG_ON() being undesirable, I think
> > liberal sprinking in text_poke() is fine; you really _REALLY_ want this
> > to work or fail loudly. Text corruption is just painful.
>
> Ok. It would be good to have the gist of this sentiment in a comment
> above it so that it is absolutely clear why we're doing it.
>
> And since text_poke() can't fail, then it doesn't need a retval too.
> AFAICT, nothing is actually using it.
See patch 12, that removes the return value (after fixing the few users
that currently 'rely' on it).
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