From: Matthias Andree <matthias.andree@stud.uni-dortmund.de>
To: linux-kernel@vger.kernel.org
Subject: [OT: nostalgia] Re: SSE related security hole
Date: Thu, 18 Apr 2002 16:02:39 +0200 [thread overview]
Message-ID: <20020418140239.GF22378@merlin.emma.line.org> (raw)
In-Reply-To: <20020417194249.B23438@redhat.com>
On Wed, 17 Apr 2002, Doug Ledford wrote:
> pxor instruction with xorps instead makes it work. So, that's a bug in
> gcc I suspect, using sse2 instructions when only called to use sse
> instructions. It seems odd to me that the CPU wouldn't generate an
> illegal instruction exception, but oh well, it evidently doesn't.
Remember ye goode olde 6502/6510 processors used in the famous Commodore
64 computers? These don't bail out when using undefined opcodes either,
some opcodes actually had undocumented but consistent behaviour and were
used in "my program is shorter than yours" 1000 byte demo contests and
the like.
prev parent reply other threads:[~2002-04-18 14:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-17 23:42 Doug Ledford
2002-04-18 5:26 ` Andrea Arcangeli
2002-04-18 9:10 ` Arjan van de Ven
2002-04-18 11:18 ` Alan Cox
2002-04-18 11:14 ` Andi Kleen
2002-04-18 11:53 ` Alan Cox
2002-04-18 11:46 ` Andi Kleen
2002-04-18 11:55 ` Andi Kleen
2002-04-18 13:44 ` Doug Ledford
2002-04-18 19:20 ` Pavel Machek
2002-04-18 19:32 ` Doug Ledford
2002-04-21 19:54 ` Pavel Machek
2002-04-18 8:22 ` Andi Kleen
2002-04-18 14:02 ` Matthias Andree [this message]
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