linux-kernel - Re: FP in kernelspace

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: <44CCFA5A.2030605@argo.co.il>
Date:	Sun, 30 Jul 2006 21:28:42 +0300
From:	Avi Kivity <avi@...o.co.il>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
CC:	Jiri Slaby <jirislaby@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: FP in kernelspace

Jan Engelhardt wrote:
>
> > kernel_fpu_begin();
> > c = d * 3.14;
> > kernel_fpu_end();
>
> static inline void kernel_fpu_begin() {
>     ...
>     preempt_disable();
>     ...
> }
>
Is the kernel allowed to clobber userspace's sse registers?

What about interrupt code?

xor.h at least appears to save the sse state before use.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

-
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/