linux-kernel - [PATCH 0/5] objtool: The stack swizzle again

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Date:   Wed, 03 Feb 2021 13:02:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Miroslav Benes <mbenes@...e.cz>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Julien Thierry <jthierry@...hat.com>,
        Kees Cook <keescook@...omium.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org
Subject: [PATCH 0/5] objtool: The stack swizzle again

Hi

The stack swizzle is current again, these patches implement objtool support for
the native x86_64 stack swizzle pattern.

It allows Thomas to use his preferred minimal stack swizzle without (much)
limitations.

We used to use SP_INDIRECT with hints back before the entry code rewrite, the
current code relies on asm with a frame-pointer setup, but that all needs to
change again.

Avoid the hint abuse and detect the pattern directly.