From: Chris J Arges <chris.j.arges@canonical.com>
To: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Michal Marek <mmarek@suse.cz>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>, Borislav Petkov <bp@alien8.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>, Pedro Alves <palves@redhat.com>,
Namhyung Kim <namhyung@gmail.com>,
Bernd Petrovitsch <bernd@petrovitsch.priv.at>,
x86@kernel.org, live-patching@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v8 00/21] Compile-time stack validation
Date: Wed, 12 Aug 2015 16:24:49 -0500 [thread overview]
Message-ID: <55CBB9A1.7000800@canonical.com> (raw)
In-Reply-To: <20150812044317.GB25439@treble.redhat.com>
<snip>
>
> Thanks for trying it out. I couldn't figure out how to recreate this
> exact error, but I played around with "make mrproper" and saw some
> probably related errors. Does this fix it?
>
> ---8<---
>
> Subject: [PATCH] stackvalidate: fix circular build dependencies
>
> After "make mrproper" with CONFIG_STACK_VALIDATION enabled, I get the
> following errors:
>
> make[2]: *** No rule to make target 'arch/x86/purgatory/purgatory.o', needed by 'arch/x86/purgatory/purgatory.ro'. Stop.
> make[3]: *** No rule to make target 'scripts/mod/empty.o', needed by 'scripts/mod/elfconfig.h'. Stop.
>
> These are caused by circular dependencies. The %.o pattern rules in
> scripts/Makefile.build have the stackvalidate binary listed as a
> dependency. But stackvalidate gets built *after* archprepare and
> scripts/mod, both of which build objects using the %.o pattern rules.
>
> The STACKVALIDATE and STACKVALIDATE_foo.o variables are already used to
> determine whether to validate a given object. Also use them to
> determine whether to create the pattern rule dependency.
>
> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
> ---
> scripts/Makefile.build | 7 +++++--
> scripts/mod/Makefile | 2 ++
> 2 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index a1270d3..ec96c51 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -243,7 +243,7 @@ endif
>
> ifdef CONFIG_STACK_VALIDATION
>
> -stackvalidate = $(objtree)/scripts/stackvalidate/stackvalidate
> +__stackvalidate = $(objtree)/scripts/stackvalidate/stackvalidate
>
> ifndef CONFIG_FRAME_POINTER
> nofp = --no-frame-pointer
> @@ -251,9 +251,12 @@ endif
>
> # Set STACKVALIDATE_foo.o=n to skip stack validation for a file.
> # Set STACKVALIDATE=n to skip stack validation for a directory.
> +stackvalidate = $(if $(patsubst n%,, \
> + $(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
> + $(__stackvalidate))
> cmd_stackvalidate = $(if $(patsubst n%,, \
> $(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
> - $(stackvalidate) $(nofp) "$(@)";)
> + $(__stackvalidate) $(nofp) "$(@)";)
>
> endif # CONFIG_STACK_VALIDATION
>
> diff --git a/scripts/mod/Makefile b/scripts/mod/Makefile
> index c11212f..374c413 100644
> --- a/scripts/mod/Makefile
> +++ b/scripts/mod/Makefile
> @@ -1,3 +1,5 @@
> +STACKVALIDATE := n
> +
> hostprogs-y := modpost mk_elfconfig
> always := $(hostprogs-y) empty.o
>
>
Josh,
I still get build failures and I've pared it down to x86_64 defconfig plus:
CONFIG_MODVERSIONS=y
CONFIG_STACK_VALIDATION=y
And it seems like some modules may get the .tmp_foo.o treatment while
others end up foo.o so something like the following will not work:
cmd_stackvalidate = $(if $(patsubst n%,, \
$(STACKVALIDATE_$(basetarget).o)$(STACKVALIDATE)y), \
$(__stackvalidate) $(nofp) "$(@D)/.tmp_$(@F)";)
In addition, I'm not sure if skipping modules like STACKVALIDATE_foo.o=n
will still function properly for modversioned modules.
I'll try to look at this more tomorrow,
--chris j arges
next prev parent reply other threads:[~2015-08-12 21:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-11 21:31 [PATCH v8 00/21] Compile-time stack validation Chris J Arges
2015-08-12 4:43 ` Josh Poimboeuf
2015-08-12 21:24 ` Chris J Arges [this message]
2015-08-13 2:07 ` Josh Poimboeuf
2015-08-13 11:22 ` Josh Poimboeuf
2015-08-13 14:42 ` Chris J Arges
2015-08-13 14:50 ` Josh Poimboeuf
-- strict thread matches above, loose matches on Subject: below --
2015-07-28 14:46 Josh Poimboeuf
2015-08-06 8:07 ` Ingo Molnar
2015-08-06 16:06 ` Josh Poimboeuf
2015-08-06 17:23 ` Josh Poimboeuf
2015-08-06 17:46 ` Josh Poimboeuf
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