linux-kernel - Re: [PATCH v3 04/17] module: ensure __cfi

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Message-ID: <YGGdNAygysK8MfnZ@gunter>
Date:   Mon, 29 Mar 2021 11:26:12 +0200
From:   Jessica Yu <jeyu@...nel.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Tejun Heo <tj@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Peter Zijlstra <peterz@...radead.org>, bpf@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/17] module: ensure __cfi_check alignment

+++ Sami Tolvanen [23/03/21 13:39 -0700]:
>CONFIG_CFI_CLANG_SHADOW assumes the __cfi_check() function is page
>aligned and at the beginning of the .text section. While Clang would
>normally align the function correctly, it fails to do so for modules
>with no executable code.
>
>This change ensures the correct __cfi_check() location and
>alignment. It also discards the .eh_frame section, which Clang can
>generate with certain sanitizers, such as CFI.
>
>Link: https://bugs.llvm.org/show_bug.cgi?id=46293
>Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Acked-by: Jessica Yu <jeyu@...nel.org>

Thanks!