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jump label: Add jump_label_text_reserved() to reserve jump points

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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>
This commit is contained in:
Jason Baron 2010-09-17 11:09:08 -04:00 • committed by Steven Rostedt
parent e0cf0cd496
commit 4c3ef6d793
4 changed files with 94 additions and 3 deletions
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3
kernel/kprobes.c
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@ -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;
}