Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20220513202159.1550547-1-samitolvanen@google.com>
 <20220513202159.1550547-12-samitolvanen@google.com> <202205141453.44171359E3@keescook>
In-Reply-To: <202205141453.44171359E3@keescook>
From:   Sami Tolvanen <samitolvanen@google.com>
Date:   Mon, 16 May 2022 09:28:23 -0700
Message-ID: <CABCJKudJZUsRjwAEzWszOGY6G5igwWVpEy1OsAWrhyKr3csUSA@mail.gmail.com>
Subject: Re: [RFC PATCH v2 11/21] arm64: Drop unneeded __nocfi attributes
To:     Kees Cook <keescook@chromium.org>
Cc:     linux-kernel@vger.kernel.org, Josh Poimboeuf <jpoimboe@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>, x86@kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Joao Moreira <joao@overdrivepizza.com>,
        Sedat Dilek <sedat.dilek@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        linux-hardening@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

On Sat, May 14, 2022 at 2:54 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Fri, May 13, 2022 at 01:21:49PM -0700, Sami Tolvanen wrote:
> > With -fsanitize=kcfi, CONFIG_CFI_CLANG no longer has issues
> > with address space confusion in functions that switch to linear
> > mapping. Now that the indirectly called assembly functions have
> > type annotations, drop the __nocfi attributes.
> >
> > Suggested-by: Mark Rutland <mark.rutland@arm.com>
> > Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
>
> It looks like there are still other cases that continue to require
> __nocfi, yes? It looks like after this series, it's still BPF?

Yes, BPF is the only remaining user of __nocfi after this series.

Sami