linux-kernel - Re: linux-next: build warning after merge of the tip tree

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Fri, 18 Jul 2014 12:16:23 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>
CC:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: linux-next: build warning after merge of the tip tree

On 07/17/2014 10:00 PM, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64
> allmodconfig) produced these warnings:
> 
> In file included from arch/x86/vdso/vdso2c.c:161:0: 
> arch/x86/vdso/vdso2c.c: In function 'main': 
> arch/x86/vdso/vdso2c.h:118:6: warning: assuming signed overflow
> does not occur when assuming that (X + c) < X is always false
> [-Wstrict-overflow] In file included from
> arch/x86/vdso/vdso2c.c:165:0: arch/x86/vdso/vdso2c.h:118:6:
> warning: assuming signed overflow does not occur when assuming that
> (X + c) < X is always false [-Wstrict-overflow]
> 
> Probably introduced by commit e6577a7ce99a ("x86, vdso: Move the
> vvar area before the vdso text").
> 

This seems toxic.

I always wonder if we shouldn't use -fwrapv for the kernel...

	-hpa

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/