linux-hardening - Re: [PATCH v4 02/15] objtool: Add ASM_STACK_FRAME_NON

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Date:   Tue, 5 Oct 2021 20:37:37 -0700
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     x86@...nel.org, Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v4 02/15] objtool: Add ASM_STACK_FRAME_NON_STANDARD

On Thu, Sep 30, 2021 at 11:05:18AM -0700, Sami Tolvanen wrote:
> To use the STACK_FRAME_NON_STANDARD macro for a static symbol
> defined in inline assembly, we need a C declaration that implies
> global visibility. This type mismatch confuses the compiler with
> CONFIG_CFI_CLANG. This change adds an inline assembly version of
> the macro to avoid the issue.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh