Date:   Fri, 10 Feb 2023 08:20:33 -0800
From:   Dan Li <ashimida.1990@gmail.com>
To:     Peter Collingbourne <pcc@google.com>
Cc:     gcc-patches@gcc.gnu.org,
        Richard Sandiford <richard.sandiford@arm.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Michal Marek <michal.lkml@markovi.net>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Sami Tolvanen <samitolvanen@google.com>,
        Kees Cook <keescook@chromium.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Tom Rix <trix@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Frederic Weisbecker <frederic@kernel.org>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        Marco Elver <elver@google.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Song Liu <song@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Uros Bizjak <ubizjak@gmail.com>,
        Kumar Kartikeya Dwivedi <memxor@gmail.com>,
        Juergen Gross <jgross@suse.com>,
        Luis Chamberlain <mcgrof@kernel.org>,
        Borislav Petkov <bp@suse.de>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Aaron Tomlin <atomlin@redhat.com>,
        Kalesh Singh <kaleshsingh@google.com>,
        Yuntao Wang <ytcoode@gmail.com>,
        Changbin Du <changbin.du@intel.com>,
        linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev,
        linux-hardening@vger.kernel.org
Subject: Re: [RFC/RFT 0/3] Add compiler support for Control Flow Integrity
Message-ID: <20230210162033.tb5b6cd3j3vxr6vv@ubuntu>
References: <20221219055431.22596-1-ashimida.1990@gmail.com>
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On 02/08, Peter Collingbourne wrote:
> On Sun, Dec 18, 2022 at 10:06 PM Dan Li <ashimida.1990@gmail.com> wrote:
> >
> > This series of patches is mainly used to support the control flow
> > integrity protection of the linux kernel [1], which is similar to
> > -fsanitize=kcfi in clang 16.0 [2,3].
> >
> > I hope that this feature will also support user-mode CFI in the
> > future (at least for developers who can recompile the runtime),
> > so I use -fsanitize=cfi as a compilation option here.
> 
> Please don't. The various CFI-related build flags are confusing enough
> without also having this inconsistency between Clang and GCC.

Hi Peter,

Got it, as discussed before[1], in the next version I will use the same
compile option.

[1]. https://patchwork.kernel.org/project/linux-arm-kernel/patch/20221219061758.23321-1-ashimida.1990@gmail.com/

Thanks,
Dan.

> 
> Peter