linux-kernel - Re: [PATCH v4 08/17] arm64/mm: Remove needless section quotes

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Message-ID: <202006291301.46FEF3B7@keescook>
Date:   Mon, 29 Jun 2020 13:04:31 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Borislav Petkov <bp@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v4 08/17] arm64/mm: Remove needless section quotes

On Mon, Jun 29, 2020 at 12:53:47PM -0700, Nick Desaulniers wrote:
> On Sun, Jun 28, 2020 at 11:18 PM Kees Cook <keescook@...omium.org> wrote:
> >
> > Fix a case of needless quotes in __section(), which Clang doesn't like.
> >
> > Acked-by: Will Deacon <will@...nel.org>
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Yep, I remember bugs from this.  Probably should scan the kernel for
> other instances of this.  +Joe for checkpatch.pl validation.

I think the others are safe because they're in macros:

$ git grep -4 '__section("'
include/linux/compiler.h-# define KENTRY(sym)                                           \
include/linux/compiler.h-       extern typeof(sym) sym;                                 \
include/linux/compiler.h-       static const unsigned long __kentry_##sym               \
include/linux/compiler.h-       __used                                                  \
include/linux/compiler.h:       __section("___kentry" "+" #sym )                        \
include/linux/compiler.h-       = (unsigned long)&sym;
--
include/linux/export.h-#define __ksym_marker(sym)       \
include/linux/export.h: static int __ksym_marker_##sym[0] __section(".discard.ksym") __used
--
include/linux/srcutree.h-# define __DEFINE_SRCU(name, is_static)                                \
include/linux/srcutree.h-       is_static struct srcu_struct name;                              \
include/linux/srcutree.h-       struct srcu_struct * const __srcu_struct_##name                 \
include/linux/srcutree.h:               __section("___srcu_struct_ptrs") = &name


> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>

Thanks!

-- 
Kees Cook