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[PATCH] x86_64: disallow multi-byte hardware execution breakpoints

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While AMD formally permits multi-byte execution breakpoints, Intel
disallows 8-byte as much as 2- or 4-byte ones.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jan Beulich 2006-03-25 16:29:19 +01:00 committed by Linus Torvalds
parent 3240114d23
commit 893efca927
1 changed files with 3 additions and 3 deletions
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6
arch/x86_64/kernel/ptrace.c
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@ -420,9 +420,9 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
case offsetof(struct user, u_debugreg[7]):
/* See arch/i386/kernel/ptrace.c for an explanation of
* this awkward check.*/
data &= ~DR_CONTROL_RESERVED;
for(i=0; i<4; i++)
if ((0x5454 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
data &= ~DR_CONTROL_RESERVED;
for(i=0; i<4; i++)
if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
break;
if (i == 4) {
child->thread.debugreg7 = data;