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Date: Thu, 2 May 2024 15:39:59 -0700
From: Kees Cook <keescook@chromium.org>
To: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: kernel test robot <oliver.sang@intel.com>,
	Edward Liaw <edliaw@google.com>, oe-lkp@lists.linux.dev,
	lkp@intel.com, linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Axel Rasmussen <axelrasmussen@google.com>,
	Bill Wendling <morbo@google.com>,
	David Hildenbrand <david@redhat.com>,
	Justin Stitt <justinstitt@google.com>,
	"Mike Rapoport (IBM)" <rppt@kernel.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Peter Xu <peterx@redhat.com>, Shuah Khan <shuah@kernel.org>,
	Will Drewry <wad@chromium.org>, linux-kselftest@vger.kernel.org,
	linux-mm@kvack.org
Subject: Re: [linus:master] [selftests/harness] 8092162335:
 kernel-selftests.sgx.make.fail
Message-ID: <202405021539.F08251ED5C@keescook>
References: <202404301040.3bea5782-oliver.sang@intel.com>
 <202405011330.85D66871E@keescook>
 <c9ad463f-cc67-44eb-bf94-449144e3078b@collabora.com>
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In-Reply-To: <c9ad463f-cc67-44eb-bf94-449144e3078b@collabora.com>

On Thu, May 02, 2024 at 11:33:17AM +0500, Muhammad Usama Anjum wrote:
> On 5/2/24 1:32 AM, Kees Cook wrote:
> > On Tue, Apr 30, 2024 at 11:02:36AM +0800, kernel test robot wrote:
> >> version: kernel-selftests-x86_64-c7864053-1_20240419
> >> [...]
> >> compiler: gcc-13
> >> 2024-04-29 15:02:59 make -j16 -C sgx
> >> [...]
> >> gcc -Wall -Werror -static-pie -nostdlib -ffreestanding -fPIE -fno-stack-protector -mrdrnd -I/usr/src/perf_selftests-x86_64-rhel-8.3-kselftests-8092162335554c8ef5e7f50eff68aa9cfbdbf865/tools/testing/selftests/../../../tools/include test_encl.c test_encl_bootstrap.S -o /usr/src/perf_selftests-x86_64-rhel-8.3-kselftests-8092162335554c8ef5e7f50eff68aa9cfbdbf865/tools/testing/selftests/sgx/test_encl.elf -Wl,-T,test_encl.lds,--build-id=none
> >> /usr/bin/ld: warning: /tmp/lkp/cct4g3SV.o: missing .note.GNU-stack section implies executable stack
> >> /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
> >> In file included from main.c:21:
> >> ../kselftest_harness.h: In function ‘__run_test’:
> >> ../kselftest_harness.h:1166:13: error: implicit declaration of function ‘asprintf’; did you mean ‘vsprintf’? [-Werror=implicit-function-declaration]
> >>  1166 |         if (asprintf(&test_name, "%s%s%s.%s", f->name,
> >>       |             ^~~~~~~~
> >>       |             vsprintf
> >> cc1: all warnings being treated as errors
> > 
> > What environment is this being built in? "asprintf" should be available
> > via stdio.h, and "kselftest_harness.h" includes that (and _GNU_SOURCE).
> Sometimes the order of include is as following:
> 
> #inlucde <stdio.h>
> #define _GNU_SOURCE
> #inlucde <stdio.h>

Oh, ew. Yeah, I see what you mean.

> The _GNU_SOURCE wasn't defined the first time stdio.h was included hence
> the definition of asprintf isn't present. The second inclusion of stdio.h
> when _GNU_SOURCE is defined is ignored as it was already included.
> 
> This is being fixed in following series:
> https://lore.kernel.org/all/20240430235057.1351993-1-edliaw@google.com

I'll comment there. Thanks!

-- 
Kees Cook