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

arch/x86_64/kernel/ptrace.c

+3 −3
Original line number Diff line number Diff line
@@ -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;