x86_64: Zero extend all registers after ptrace in 32bit entry path.

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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>

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This commit is contained in:

Andi Kleen 2007-09-21 16:16:18 +02:00 • committed by Linus Torvalds

parent 335fb8fc71

commit 176df2457e

2 changed files with 15 additions and 7 deletions

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18

arch/x86_64/ia32/ia32entry.S

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4

arch/x86_64/kernel/ptrace.c

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