[PATCH] ppc64 kprobes: correct kprobe registration return values
Add stricter checks during kprobe registration. Return correct error value so
insmod doesn't succeed. Also printk reason for registration failure.
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/ppc64/kernel/kprobes.c b/arch/ppc64/kernel/kprobes.c
index 5a9f47b..8f33172 100644
--- a/arch/ppc64/kernel/kprobes.c
+++ b/arch/ppc64/kernel/kprobes.c
@@ -45,12 +45,17 @@
int arch_prepare_kprobe(struct kprobe *p)
{
+ int ret = 0;
kprobe_opcode_t insn = *p->addr;
- if (IS_MTMSRD(insn) || IS_RFID(insn))
- /* cannot put bp on RFID/MTMSRD */
- return 1;
- return 0;
+ if ((unsigned long)p->addr & 0x03) {
+ printk("Attempt to register kprobe at an unaligned address\n");
+ ret = -EINVAL;
+ } else if (IS_MTMSRD(insn) || IS_RFID(insn)) {
+ printk("Cannot register a kprobe on rfid or mtmsrd\n");
+ ret = -EINVAL;
+ }
+ return ret;
}
void arch_copy_kprobe(struct kprobe *p)