linux-hardening - Re: [PATCH] sparc: Add missing "FORCE" target when using if

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Date:   Tue, 5 Oct 2021 21:45:40 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Nicolas Schier <n.schier@....de>, sparclinux@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] sparc: Add missing "FORCE" target when using if_changed

On Fri, Sep 24, 2021 at 06:38:56AM +0200, Nicolas Schier wrote:
> On Thu, Sep 23, 2021 at 02:54:18PM -0700, Kees Cook wrote:
> > Fix observed warning:
> > 
> >     /builds/linux/arch/sparc/boot/Makefile:35: FORCE prerequisite is missing
> > 
> > Fixes: e1f86d7b4b2a5213 ("kbuild: warn if FORCE is missing for if_changed(_dep,_rule) and filechk")
> > Cc: "David S. Miller" <davem@...emloft.net>
> > Cc: Masahiro Yamada <masahiroy@...nel.org>
> > Cc: sparclinux@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Acked-by: Nicolas Schier <n.schier@....de>

Thanks!

Masahiro, are you able to add this to your kbuild tree?

-Kees

> 
> > ---
> > I'm not sure if this should go via sparc or via kbuild. :)
> > ---
> >  arch/sparc/boot/Makefile | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> > 
> > diff --git a/arch/sparc/boot/Makefile b/arch/sparc/boot/Makefile
> > index 849236d4eca4..45e5c76d449e 100644
> > --- a/arch/sparc/boot/Makefile
> > +++ b/arch/sparc/boot/Makefile
> > @@ -22,7 +22,7 @@ ifeq ($(CONFIG_SPARC64),y)
> >  
> >  # Actual linking
> >  
> > -$(obj)/zImage: $(obj)/image
> > +$(obj)/zImage: $(obj)/image FORCE
> >  	$(call if_changed,gzip)
> >  	@echo '  kernel: $@ is ready'
> >  
> > @@ -31,7 +31,7 @@ $(obj)/vmlinux.aout: vmlinux FORCE
> >  	@echo '  kernel: $@ is ready'
> >  else
> >  
> > -$(obj)/zImage: $(obj)/image
> > +$(obj)/zImage: $(obj)/image FORCE
> >  	$(call if_changed,strip)
> >  	@echo '  kernel: $@ is ready'
> >  
> > @@ -44,7 +44,7 @@ OBJCOPYFLAGS_image.bin := -S -O binary -R .note -R .comment
> >  $(obj)/image.bin: $(obj)/image FORCE
> >  	$(call if_changed,objcopy)
> >  
> > -$(obj)/image.gz: $(obj)/image.bin
> > +$(obj)/image.gz: $(obj)/image.bin FORCE
> >  	$(call if_changed,gzip)
> >  
> >  UIMAGE_LOADADDR = $(CONFIG_UBOOT_LOAD_ADDR)
> > @@ -56,7 +56,7 @@ quiet_cmd_uimage.o = UIMAGE.O $@
> >                       -r -b binary $@ -o $@.o
> >  
> >  targets += uImage
> > -$(obj)/uImage: $(obj)/image.gz
> > +$(obj)/uImage: $(obj)/image.gz FORCE
> >  	$(call if_changed,uimage)
> >  	$(call if_changed,uimage.o)
> >  	@echo '  Image $@ is ready'
> > -- 
> > 2.30.2
> > 

-- 
Kees Cook