linux-kernel - Re: [PATCH v2 4/5] selftests: Drop define _GNU

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

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Wed, 8 May 2024 13:27:39 -0700
From: Edward Liaw <edliaw@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: shuah@...nel.org, Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, 
	Takashi Iwai <tiwai@...e.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Nhat Pham <nphamcs@...il.com>, Johannes Weiner <hannes@...xchg.org>, 
	Christian Brauner <brauner@...nel.org>, Eric Biederman <ebiederm@...ssion.com>, 
	Kees Cook <keescook@...omium.org>, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Darren Hart <dvhart@...radead.org>, 
	Davidlohr Bueso <dave@...olabs.net>, André Almeida <andrealmeid@...lia.com>, 
	Jiri Kosina <jikos@...nel.org>, Benjamin Tissoires <bentiss@...nel.org>, Jason Gunthorpe <jgg@...pe.ca>, 
	Kevin Tian <kevin.tian@...el.com>, Andy Lutomirski <luto@...capital.net>, 
	Will Drewry <wad@...omium.org>, Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	James Morse <james.morse@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Anup Patel <anup@...infault.org>, Atish Patra <atishp@...shpatra.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	David Hildenbrand <david@...hat.com>, Mickaël Salaün <mic@...ikod.net>, 
	Paul Moore <paul@...l-moore.com>, James Morris <jmorris@...ei.org>, 
	"Serge E. Hallyn" <serge@...lyn.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Seth Forshee <sforshee@...nel.org>, Bongsu Jeon <bongsu.jeon@...sung.com>, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Steffen Klassert <steffen.klassert@...unet.com>, Herbert Xu <herbert@...dor.apana.org.au>, 
	Andreas Färber <afaerber@...e.de>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, Matthieu Baerts <matttbe@...nel.org>, 
	Mat Martineau <martineau@...nel.org>, Geliang Tang <geliang@...nel.org>, 
	Willem de Bruijn <willemdebruijn.kernel@...il.com>, Fenghua Yu <fenghua.yu@...el.com>, 
	Reinette Chatre <reinette.chatre@...el.com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, "Paul E. McKenney" <paulmck@...nel.org>, 
	Boqun Feng <boqun.feng@...il.com>, Alexandre Belloni <alexandre.belloni@...tlin.com>, 
	Jarkko Sakkinen <jarkko@...nel.org>, Dave Hansen <dave.hansen@...ux.intel.com>, 
	Muhammad Usama Anjum <usama.anjum@...labora.com>, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, kernel-team@...roid.com, 
	linux-sound@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mm@...ck.org, linux-input@...r.kernel.org, iommu@...ts.linux.dev, 
	kvmarm@...ts.linux.dev, kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-security-module@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org, 
	linux-actions@...ts.infradead.org, mptcp@...ts.linux.dev, 
	linux-rtc@...r.kernel.org, linux-sgx@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2 4/5] selftests: Drop define _GNU_SOURCE

On Wed, May 8, 2024 at 6:54 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> On Tue, May 07, 2024, Edward Liaw wrote:
> > _GNU_SOURCE is provided by KHDR_INCLUDES, so it should be dropped to
> > prevent _GNU_SOURCE redefined warnings.
>
> ...
>
> > diff --git a/tools/testing/selftests/x86/test_syscall_vdso.c b/tools/testing/selftests/x86/test_syscall_vdso.c
> > index 8965c311bd65..5cd13279bba5 100644
> > --- a/tools/testing/selftests/x86/test_syscall_vdso.c
> > +++ b/tools/testing/selftests/x86/test_syscall_vdso.c
> > @@ -8,10 +8,6 @@
> >   * Can be built statically:
> >   * gcc -Os -Wall -static -m32 test_syscall_vdso.c thunks_32.S
> >   */
> > -#undef _GNU_SOURCE
> > -#define _GNU_SOURCE 1
> > -#undef __USE_GNU
> > -#define __USE_GNU 1
>
> AFAICT, manually defining __USE_GNU is frowned upon, so I'm guessing the __USE_GNU
> stuff is just the result of misguided copy+paste.  But it would be nice to get
> confirmation that this test isn't doing something clever.  Or at the very least,
> explain the removal of __USE_GNU in the changelog.

It looks like test_syscall_vdso, test_FCMOV, test_FCOMI, and
test_FISTTP don't actually use any GNU extensions.  I'll add that to
the commit message.


>
> >  #include <unistd.h>
> >  #include <stdlib.h>
> >  #include <string.h>