Re: FreeBSD-SA-06:14.fpu
- From: Rostislav Krasny <rosti.bsd@xxxxxxxxx>
- Date: Sun, 30 Apr 2006 14:24:08 +0300
David Xu wrote:
Igor Sysoev wrote:
The last security advisory FreeBSD-SA-06:14.fpu
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:14.fpu.asc
that fixes very doubtful security bug in AMD CPUs, also
adds unnecessary penalty in FPU context switch for all other
SSE-enabled CPUs.
Probably it should only be applied to AMD CPU but not Intel and others,
it is easy to check cpu vendor and put a
if (bug_fxsave)
fpu_clean_state();
in file npx.c.
Other possible solution is making the fpu_clean_state() optional by
something like following:
#ifdef BUG_FXSAVE
#define fpu_clean_state() __fpu_clean_state()
#else
#define fpu_clean_state() ;
#endif
... and including "options BUG_FXSAVE" to GENERIC.
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