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

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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>
This commit is contained in:
Andi Kleen 2006-07-28 14:44:45 +02:00 committed by Linus Torvalds
parent d5a2601734
commit 0e92da4acb
1 changed files with 1 additions and 1 deletions
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arch/x86_64/ia32/ia32entry.S
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@ -103,7 +103,7 @@ ENTRY(ia32_sysenter_target)
pushq %rax
CFI_ADJUST_CFA_OFFSET 8
cld
SAVE_ARGS 0,0,1
SAVE_ARGS 0,0,0
/* no need to do an access_ok check here because rbp has been
32bit zero extended */
1: movl (%rbp),%r9d