linux-hardening - Re: [PATCH v5 00/15] x86: Add support for Clang CFI

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Date:   Thu, 21 Oct 2021 10:27:10 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Alexander Lobakin <alobakin@...me>,
        Kees Cook <keescook@...omium.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, x86@...nel.org
Subject: Re: [PATCH v5 00/15] x86: Add support for Clang CFI

From: Sami Tolvanen <samitolvanen@...gle.com>
Date: Wed, 13 Oct 2021 11:16:43 -0700

> This series adds support for Clang's Control-Flow Integrity (CFI)
> checking to x86_64. With CFI, the compiler injects a runtime
> check before each indirect function call to ensure the target is
> a valid function with the correct static type. This restricts
> possible call targets and makes it more difficult for an attacker
> to exploit bugs that allow the modification of stored function
> pointers. For more details, see:
>
>   https://clang.llvm.org/docs/ControlFlowIntegrity.html
>
> Note that v5 is based on tip/master. The first two patches contain
> objtool support for CFI, the remaining patches change function
> declarations to use opaque types, fix type mismatch issues that
> confuse the compiler, and disable CFI where it can't be used.
>
> You can also pull this series from
>
>   https://github.com/samitolvanen/linux.git x86-cfi-v5

[ snip ]

I've been using it since the end of May on my x86_64, so for v5
(with changing retpoline thunks prototypes to opaque):

Reviwed-by: Alexander Lobakin <alobakin@...me>
Tested-by: Alexander Lobakin <alobakin@...me>

Thanks!
Al