linux-kernel - Re: math-emu issue with fp divide

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]

Message-Id: <20080604.144950.117343339.davem@davemloft.net>
Date:	Wed, 04 Jun 2008 14:49:50 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	joseph@...esourcery.com
Cc:	galak@...nel.crashing.org, linux-kernel@...r.kernel.org,
	libc-alpha@...rceware.org
Subject: Re: math-emu issue with fp divide

From: "Joseph S. Myers" <joseph@...esourcery.com>
Date: Wed, 4 Jun 2008 21:42:55 +0000 (UTC)

> On Wed, 4 Jun 2008, Kumar Gala wrote:
> 
> > I'm trying to move the powerpc math-emu
> > code to use the include/math-emu bits.
> 
> I'd like to remind people that the include/math-emu code is based on an 
> old, buggy version of the soft-fp code in glibc.  RTH previously noted 
> <http://sourceware.org/ml/libc-alpha/2006-02/msg00075.html> that the fixes 
> should go in the kernel, when approving a patch of mine fixing various 
> bugs and speeding up soft-fp, and several more bugs have been fixed since 
> then in the course of GCC work on soft-float for Power and __float128 
> support for x86_64.
> 
> So it may be better than the old code you're replacing, but it might still 
> be a good idea to merge things with the current glibc code, as a matter of 
> both correctness and performance.  (And there may well still be bugs left 
> in the code.)

Once the GCC folks started looking into using the soft-fp bits I knew
this situation would develop.  The kernel side would have some set of
fixes and the glibc/gcc side would have yet another set.

To be honest this doesn't surprise me...
--
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/