linux-kernel - Re: [RFC PATCH v2 11/21] arm64: Drop unneeded _

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Message-ID: <CABCJKudJZUsRjwAEzWszOGY6G5igwWVpEy1OsAWrhyKr3csUSA@mail.gmail.com>
Date:   Mon, 16 May 2022 09:28:23 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Joao Moreira <joao@...rdrivepizza.com>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-hardening@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
Subject: Re: [RFC PATCH v2 11/21] arm64: Drop unneeded __nocfi attributes

On Sat, May 14, 2022 at 2:54 PM Kees Cook <keescook@...omium.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@....com>
> > Signed-off-by: Sami Tolvanen <samitolvanen@...gle.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