tree f720ea910c370c86a244a6ac4b94706bac276ad0
parent d5a2601734bcc740ee78dc4cb0c56b5687da7bd9
author Andi Kleen <ak@suse.de> 1154090685 +0200
committer Linus Torvalds <torvalds@g5.osdl.org> 1154140080 -0700

[PATCH] x86_64: Don't clobber r8-r11 in int 0x80 handler

When int 0x80 is called from long mode r8-r11 would leak out of the
kernel (or rather they would be filled with some values from
the kernel stack). I don't think it's a security issue because
the values come from the fixed stack frame which should be near
always user registers from a previous interrupt.

Still better fix it.

Longer term the register save macros need to be cleaned up
to avoid such mistakes in the future.

Original analysis from Richard Brunner, fix by me.

Cc: Richard.Brunner@amd.com

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