linux-hardening - Re: [PATCH] x86/alternatives: Make FineIBT mode Kconfig selectable

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Message-ID: <CABCJKufZ7zXq7-Jqdqpc-Cq8Jb3RyDTXO3p7NqZv0eRUxU9Ohg@mail.gmail.com>
Date: Wed, 1 May 2024 13:18:40 -0700
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Kees Cook <keescook@...omium.org>
Cc: Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"H. Peter Anvin" <hpa@...or.com>, Alexei Starovoitov <ast@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
	Josh Poimboeuf <jpoimboe@...nel.org>, Juergen Gross <jgross@...e.com>, Breno Leitao <leitao@...ian.org>, 
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] x86/alternatives: Make FineIBT mode Kconfig selectable

On Tue, Apr 30, 2024 at 5:02 PM Kees Cook <keescook@...omium.org> wrote:
>
> 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=kcfi" boot param mode to be selectable through Kconfig via the
> newly introduced CONFIG_CFI_AUTO_DEFAULT.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---

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

Sami