From: Jan Beulich <jbeulich@xxxxxxxxxx>
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@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
arch/x86_64/kernel/ptrace.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
Index: linux/arch/x86_64/kernel/ptrace.c
===================================================================
--- linux.orig/arch/x86_64/kernel/ptrace.c
+++ linux/arch/x86_64/kernel/ptrace.c
@@ -420,9 +420,9 @@ long arch_ptrace(struct task_struct *chi
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;
-
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