linux-kernel - Re: [PATCH v3 07/16] lkdtm: Disable UNSET

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Message-ID: <202109141229.F1710D3A@keescook>
Date:   Tue, 14 Sep 2021 12:30:26 -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>,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH v3 07/16] lkdtm: Disable UNSET_SMEP with CFI

On Tue, Sep 14, 2021 at 12:10:36PM -0700, Sami Tolvanen wrote:
> Disable the UNSET_SMEP test when CONFIG_CFI_CLANG is enabled as
> jumping to a call gadget would always trip CFI instead.
> 
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

Yeah, (thankfully) this test can't work sanely under CFI.

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

-- 
Kees Cook