Kprobes can use the text edit lock to insure mutual exclusion when edition the code and make sure the pages are writable. Signed-off-by: Mathieu Desnoyers --- arch/i386/kernel/kprobes.c | 4 ++++ 1 file changed, 4 insertions(+) Index: linux-2.6-lttng/arch/i386/kernel/kprobes.c =================================================================== --- linux-2.6-lttng.orig/arch/i386/kernel/kprobes.c 2007-06-18 17:41:27.000000000 -0400 +++ linux-2.6-lttng/arch/i386/kernel/kprobes.c 2007-06-18 17:41:31.000000000 -0400 @@ -169,14 +169,18 @@ void __kprobes arch_arm_kprobe(struct kprobe *p) { + kernel_text_lock((unsigned long)p->addr, sizeof(kprobe_opcode_t)); *p->addr = BREAKPOINT_INSTRUCTION; + kernel_text_unlock((unsigned long)p->addr, sizeof(kprobe_opcode_t)); flush_icache_range((unsigned long) p->addr, (unsigned long) p->addr + sizeof(kprobe_opcode_t)); } void __kprobes arch_disarm_kprobe(struct kprobe *p) { + kernel_text_lock((unsigned long)p->addr, sizeof(kprobe_opcode_t)); *p->addr = p->opcode; + kernel_text_unlock((unsigned long)p->addr, sizeof(kprobe_opcode_t)); flush_icache_range((unsigned long) p->addr, (unsigned long) p->addr + sizeof(kprobe_opcode_t)); } -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/