jump label: Add jump_label_text_reserved() to reserve jump points

Add a jump_label_text_reserved(void *start, void *end), so that other
pieces of code that want to modify kernel text, can first verify that
jump label has not reserved the instruction.

Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <06236663a3a7b1c1f13576bb9eccb6d9c17b7bfe.1284733808.git.jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 18904e42a918..ec4210c6501e 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1147,7 +1147,8 @@ int __kprobes register_kprobe(struct kprobe *p)
         preempt_disable();
         if (!kernel_text_address((unsigned long) p->addr) ||
             in_kprobes_functions((unsigned long) p->addr) ||
-            ftrace_text_reserved(p->addr, p->addr)) {
+            ftrace_text_reserved(p->addr, p->addr) ||
+            jump_label_text_reserved(p->addr, p->addr)) {
                 preempt_enable();
                 return -EINVAL;
         }