linux-kernel - Re: [PATCH] ARM: kbuild: use correct nm executable

Open Source and information security mailing list archives

Date:   Tue, 12 Nov 2019 11:21:09 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Dmitry Golovin <dima@...ovin.in>
Cc:     Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nicolas Pitre <nico@...xnic.net>,
        Matthias Maennich <maennich@...gle.com>,
        Russell King <linux@...linux.org.uk>,
        Stefan Agner <stefan@...er.ch>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: kbuild: use correct nm executable

On Mon, Nov 11, 2019 at 12:32 AM Dmitry Golovin <dima@...ovin.in> wrote:
>
> Since $(NM) variable can be easily overridden for the whole build, it's
> better to use it instead of $(CROSS_COMPILE)nm. The use of $(CROSS_COMPILE)
> prefixed variables where their calculated equivalents can be used is
> incorrect. This fixes issues with builds where $(NM) is set to llvm-nm.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/766
> Signed-off-by: Dmitry Golovin <dima@...ovin.in>
> Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Matthias Maennich <maennich@...gle.com>
> ---

Reviewed-by: Masahiro Yamada <yamada.masahiro@...ionext.com>


>  arch/arm/boot/compressed/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/boot/compressed/Makefile b/arch/arm/boot/compressed/Makefile
> index 9219389bbe61..a1e883c5e5c4 100644
> --- a/arch/arm/boot/compressed/Makefile
> +++ b/arch/arm/boot/compressed/Makefile
> @@ -121,7 +121,7 @@ ccflags-y := -fpic $(call cc-option,-mno-single-pic-base,) -fno-builtin -I$(obj)
>  asflags-y := -DZIMAGE
>
>  # Supply kernel BSS size to the decompressor via a linker symbol.
> -KBSS_SZ = $(shell echo $$(($$($(CROSS_COMPILE)nm $(obj)/../../../../vmlinux | \
> +KBSS_SZ = $(shell echo $$(($$($(NM) $(obj)/../../../../vmlinux | \
>                 sed -n -e 's/^\([^ ]*\) [AB] __bss_start$$/-0x\1/p' \
>                        -e 's/^\([^ ]*\) [AB] __bss_stop$$/+0x\1/p') )) )
>  LDFLAGS_vmlinux = --defsym _kernel_bss_size=$(KBSS_SZ)
> @@ -165,7 +165,7 @@ $(obj)/bswapsdi2.S: $(srctree)/arch/$(SRCARCH)/lib/bswapsdi2.S
>  # The .data section is already discarded by the linker script so no need
>  # to bother about it here.
>  check_for_bad_syms = \
> -bad_syms=$$($(CROSS_COMPILE)nm $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
> +bad_syms=$$($(NM) $@ | sed -n 's/^.\{8\} [bc] \(.*\)/\1/p') && \
>  [ -z "$$bad_syms" ] || \
>    ( echo "following symbols must have non local/private scope:" >&2; \
>      echo "$$bad_syms" >&2; false )
> --
> 2.23.0
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


-- 
Best Regards
Masahiro Yamada

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives