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| author | Jan Beulich <jbeulich@novell.com> | 2006-03-25 16:29:19 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-25 09:10:52 -0800 |
| commit | 893efca9279d7a78bae6532de0524e53370819d5 (patch) | |
| tree | 5ae05a1b6a0aa34cab50c0826782c04e9cc338f9 /arch/x86_64/kernel/ptrace.c | |
| parent | 3240114d23793384fa9c3c53f391f672d1c22d2e (diff) | |
| download | linux-stable-893efca9279d7a78bae6532de0524e53370819d5.tar.gz linux-stable-893efca9279d7a78bae6532de0524e53370819d5.tar.bz2 linux-stable-893efca9279d7a78bae6532de0524e53370819d5.zip | |
[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: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/kernel/ptrace.c')
| -rw-r--r-- | arch/x86_64/kernel/ptrace.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c index 53205622351c..d44b2c1e63a6 100644 --- a/arch/x86_64/kernel/ptrace.c +++ b/arch/x86_64/kernel/ptrace.c @@ -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; |