linux-kernel - Re: [PATCH] sparc: vdso: fix build error of vdso32

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Date:   Wed, 13 Nov 2019 15:59:27 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Anatoly Pugachev <matorola@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        "ndesaulniers@...gle.com" <ndesaulniers@...gle.com>
Subject: Re: [PATCH] sparc: vdso: fix build error of vdso32

On Sun, Sep 22, 2019 at 08:34:36PM +0900, Masahiro Yamada wrote:
> Since commit 54b8ae66ae1a ("kbuild: change *FLAGS_<basetarget>.o to
> take the path relative to $(obj)"), sparc allmodconfig fails to build
> as follows:
> 
>   CC      arch/sparc/vdso/vdso32/vclock_gettime.o
> unrecognized e_machine 18 arch/sparc/vdso/vdso32/vclock_gettime.o
> arch/sparc/vdso/vdso32/vclock_gettime.o: failed
> 
> The cause of the breakage is that -pg flag not being dropped.
> 
> The vdso32 files are located in the vdso32/ subdirectory, but I missed
> to update the Makefile.
> 
> Fixes: 54b8ae66ae1a ("kbuild: change *FLAGS_<basetarget>.o to take the path relative to $(obj)")
> Reported-by: Anatoly Pugachev <matorola@...il.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>

I've tripped over this as well. Since no one has picked this up, can you
take it via your tree Masahiro?

Thanks!

-Kees

> ---
> 
>  arch/sparc/vdso/Makefile | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/sparc/vdso/Makefile b/arch/sparc/vdso/Makefile
> index 324a23947585..399bc22b1cf8 100644
> --- a/arch/sparc/vdso/Makefile
> +++ b/arch/sparc/vdso/Makefile
> @@ -67,12 +67,14 @@ $(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS) $(SPARC_REG_CFLAGS
>  #
>  CFLAGS_REMOVE_vdso-note.o = -pg
>  CFLAGS_REMOVE_vclock_gettime.o = -pg
> +CFLAGS_REMOVE_vdso32/vdso-note.o = -pg
> +CFLAGS_REMOVE_vdso32/vclock_gettime.o = -pg
>  
>  $(obj)/%.so: OBJCOPYFLAGS := -S
>  $(obj)/%.so: $(obj)/%.so.dbg FORCE
>  	$(call if_changed,objcopy)
>  
> -CPPFLAGS_vdso32.lds = $(CPPFLAGS_vdso.lds)
> +CPPFLAGS_vdso32/vdso32.lds = $(CPPFLAGS_vdso.lds)
>  VDSO_LDFLAGS_vdso32.lds = -m elf32_sparc -soname linux-gate.so.1
>  
>  #This makes sure the $(obj) subdirectory exists even though vdso32/
> -- 
> 2.17.1
> 

-- 
Kees Cook