linux-kernel - Re: [PATCH v4 19/45] x86/livepatch: Validate __fentry_

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Message-ID: <alpine.LSU.2.21.2203090958270.672@pobox.suse.cz>
Date:   Wed, 9 Mar 2022 09:58:44 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Peter Zijlstra <peterz@...radead.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,
        keescook@...omium.org, samitolvanen@...gle.com,
        mark.rutland@....com, alyssa.milburn@...el.com,
        rostedt@...dmis.org, mhiramat@...nel.org,
        alexei.starovoitov@...il.com
Subject: Re: [PATCH v4 19/45] x86/livepatch: Validate __fentry__ location

On Tue, 8 Mar 2022, Peter Zijlstra wrote:

> Currently livepatch assumes __fentry__ lives at func+0, which is most
> likely untrue with IBT on. Instead make it use ftrace_location() by
> default which both validates and finds the actual ip if there is any
> in the same symbol.
> 
> Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

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

M