[PATCH] x86_64: When user could have changed RIP always force IRET

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Intel EM64T CPUs handle uncanonical return addresses differently
from AMD CPUs.

The exception is reported in the SYSRET, not the next instruction.
This leads to the kernel exception handler running on the user stack
with the wrong GS because the kernel didn't expect exceptions
on this instruction.

This version of the patch has the teething problems that plagued an earlier
version fixed.

This is CVE-2006-0744

Thanks to Ernie Petrides and Asit B. Mallick for analysis and initial
patches.

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

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Andi Kleen 2006-04-07 19:50:00 +02:00 • committed by Linus Torvalds

parent 553f265fe8

commit 7bf36bbc5e

1 changed files with 10 additions and 2 deletions

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arch/x86_64/kernel/entry.S

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