linux-kernel - Re: [PATCH v2 10/39] x86/ibt,crypto: Add ENDBR for the jump-table entries

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Message-ID: <Yhit9iXttJ5NJRxo@hirez.programming.kicks-ass.net>
Date:   Fri, 25 Feb 2022 11:22:46 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com,
        linux-kernel@...r.kernel.org, ndesaulniers@...gle.com,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: Re: [PATCH v2 10/39] x86/ibt,crypto: Add ENDBR for the jump-table
 entries

On Thu, Feb 24, 2022 at 04:50:40PM -0800, Kees Cook wrote:
> On Thu, Feb 24, 2022 at 03:51:48PM +0100, Peter Zijlstra wrote:
> > 
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> 
> Can you put some details in the commit log here about why these are
> needed? My eyes can't find the indirect users...

	## branch into array
	mov	jump_table(,%rax,8), %bufp
	JMP_NOSPEC bufp

:-)