linux-hardening - Re: [PATCH v5 02/15] objtool: Add ASM_STACK_FRAME_NON

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <202110131159.1A0BB2876@keescook>
Date:   Wed, 13 Oct 2021 11:59:59 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     x86@...nel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v5 02/15] objtool: Add ASM_STACK_FRAME_NON_STANDARD

On Wed, Oct 13, 2021 at 11:16:45AM -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>

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook