linux-kernel - Re: [next-20250226]Build Failure

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Message-ID: <202502280920.583F8CD5F@keescook>
Date: Fri, 28 Feb 2025 09:20:30 -0800
From: Kees Cook <kees@...nel.org>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: Michael Kelley <mhklinux@...look.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Venkat Rao Bagalkote <venkat88@...ux.vnet.ibm.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [next-20250226]Build Failure

On Thu, Feb 27, 2025 at 03:15:35PM +0100, Christophe Leroy wrote:
> 
> 
> Le 27/02/2025 à 15:05, Michael Kelley a écrit :
> > From: Christophe Leroy <christophe.leroy@...roup.eu> Sent: Thursday, February 27, 2025 2:43 AM
> > > 
> > > Le 27/02/2025 à 02:38, Stephen Rothwell a écrit :
> > > > Hi Venkat,
> > > > 
> > > > CC Kees Cook for advice.  This is a result of the tests added in commit
> > > > 
> > > >     bbeb38b8487a ("string.h: Validate memtostr*()/strtomem*() arguments more carefully")
> > > > 
> > > > from the kspp tree.
> > > > 
> > > > I note that the comment about memtostr() says "Copy a possibly
> > > > non-NUL-term string".
> > > 
> > > Can you tell more about your config and your environment ?
> > > 
> > > I just tested with ppc64_defconfig and ppc64le_defconfig, with gcc 12.4,
> > > gcc 13.2 and gcc 14.2 and didn't get that build error.
> > > 
> > > Christophe
> > 
> > FWIW, I see the same build failures related to __must_be_noncstr()
> > when building natively on x86 and on arm64. In both cases, it's an
> > Ubuntu 20.04 installation with gcc 9.4.0 and binutils 2.34.
> > 
> 
> Looks like I get that problem only with GCC 8.5 and GCC 9.5.
> 
> I don't get it with gcc 10.3 nor 11.3 nor 12.4 nor 13.2 nor 14.2
> I don't get it either with gcc 5.5 or 7.5

I will investigate! Sorry for the trouble.

-- 
Kees Cook