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From: Sami Tolvanen <samitolvanen@google.com>
Date: Wed, 1 May 2024 13:18:40 -0700
Message-ID: <CABCJKufZ7zXq7-Jqdqpc-Cq8Jb3RyDTXO3p7NqZv0eRUxU9Ohg@mail.gmail.com>
Subject: Re: [PATCH] x86/alternatives: Make FineIBT mode Kconfig selectable
To: Kees Cook <keescook@chromium.org>
Cc: Peter Zijlstra <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, 
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>, 
	Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org, 
	"H. Peter Anvin" <hpa@zytor.com>, Alexei Starovoitov <ast@kernel.org>, Nathan Chancellor <nathan@kernel.org>, 
	Josh Poimboeuf <jpoimboe@kernel.org>, Juergen Gross <jgross@suse.com>, Breno Leitao <leitao@debian.org>, 
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
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On Tue, Apr 30, 2024 at 5:02=E2=80=AFPM Kees Cook <keescook@chromium.org> w=
rote:
>
> Since FineIBT performs checking at the destination, it is weaker against
> attacks that can construct arbitrary executable memory contents. As such,
> some system builders want to run with FineIBT disabled by default. Allow
> the "cfi=3Dkcfi" boot param mode to be selectable through Kconfig via the
> newly introduced CONFIG_CFI_AUTO_DEFAULT.
>
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---

Reviewed-by: Sami Tolvanen <samitolvanen@google.com>

Sami