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x86_64: Zero extend all registers after ptrace in 32bit entry path.
authorAndi Kleen <ak@suse.de>
Fri, 21 Sep 2007 14:16:18 +0000 (16:16 +0200)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Fri, 21 Sep 2007 16:52:07 +0000 (09:52 -0700)
Strictly it's only needed for eax.

It actually does a little more than strictly needed -- the other registers
are already zero extended.

Also remove the now unnecessary and non functional compat task check
in ptrace.

This is CVE-2007-4573

Found by Wojciech Purczynski

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

No differences found
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