linux-kernel - Re: Linux 2.6.27.27

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:	Mon, 20 Jul 2009 20:37:53 -0400
From:	Marc Dionne <marc.c.dionne@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Krzysztof Oledzki <olel@....pl>, Greg KH <gregkh@...e.de>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	lwn@....net
Subject: Re: Linux 2.6.27.27

On 07/20/2009 07:56 PM, Linus Torvalds wrote:
>
> On Mon, 20 Jul 2009, Marc Dionne wrote:
>> I might be seeing a slightly different bug, but in case it's helpful, the
>> behaviour here on Fedora rawhide with gcc-4.4.0-14.x86_64 and
>> binutils-2.19.51.0.11-27.fc12.x86_64 is that I get various .o files that come
>> out as completely empty files (or in one case as a precisely 64K sized file
>> that gives a "File format not recognized" error"), and the latest 2.6.31-rc
>> git can't be built at all.
>
> Hmm. This sounds more like the binutils bug that people had. Sounds like
> an assembler bug if the *.o file ends up being empty or at some fixed
> size. If it was cc1 that fails, I'd expect to not see an *.o file at all,
> since it didn't generate good assembly.
>
> In fact, your behavior sounds like the thing that produces the *.o files
> core-dumped or died for other reasons, and had a 64kB buffer that either
> got flushed or not. That would explain the "zero or exactly 64kB" size.
>
> It could be ccache too, of course.

Actually in my case it turns out that it is ccache after all - if I 
remove it from the picture everything is fine.  If I re-enable it, even 
with a clean cache, I get the problem.

It might just be a coincidence that it's triggered by the -fwrapv change.

Marc
--
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/