linux-kernel - Re: [patch 00/38] x86/retbleed: Call depth tracking mitigation

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Message-ID: <87ilnotawy.ffs@tglx>
Date:   Sat, 23 Jul 2022 11:50:53 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Joao Moreira <joao@...rdrivepizza.com>,
        LKML <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        "Cooper, Andrew" <andrew.cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        "Moreira, Joao" <joao.moreira@...el.com>,
        "Nuzman, Joseph" <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Gross, Jurgen" <jgross@...e.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Peter Collingbourne <pcc@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [patch 00/38] x86/retbleed: Call depth tracking mitigation

On Thu, Jul 21 2022 at 17:54, Peter Zijlstra wrote:
> On Wed, Jul 20, 2022 at 11:13:16PM +0200, Peter Zijlstra wrote:
> The idea is the above callthunk that makes any offset work by not having
> the full hash as an immediate and allow kCFI along with
> -fpatchable-function-entry=N,M and include M in the offset.
>
> Specifically, I meant to use -fpatchable-function-entry=16,16, but alas,
> I never got that far.

That's embarrasing. I missed that option in the maze of gcc
options. That would have spared me to stare at gcc code :)