Commit 893efca9 authored by Jan Beulich's avatar Jan Beulich Committed by Linus Torvalds

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

While AMD formally permits multi-byte execution breakpoints, Intel
disallows 8-byte as much as 2- or 4-byte ones.
Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 3240114d
......@@ -422,7 +422,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
* this awkward check.*/
data &= ~DR_CONTROL_RESERVED;
for(i=0; i<4; i++)
if ((0x5454 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
if ((0x5554 >> ((data >> (16 + 4*i)) & 0xf)) & 1)
break;
if (i == 4) {
child->thread.debugreg7 = data;
......
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