From 63224d1e8b4cf87cc7420201a8cb3b44b9bf0b40 Mon Sep 17 00:00:00 2001 From: Ananth N Mavinakayanahalli Date: Wed, 8 Jun 2005 15:49:41 -0700 Subject: [PATCH] [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 Signed-off-by: Paul Mackerras Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ppc64/kernel/kprobes.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/arch/ppc64/kernel/kprobes.c b/arch/ppc64/kernel/kprobes.c index 5a9f47b18c45..8f3317244311 100644 --- a/arch/ppc64/kernel/kprobes.c +++ b/arch/ppc64/kernel/kprobes.c @@ -45,12 +45,17 @@ static struct pt_regs jprobe_saved_regs; 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) -- 2.20.1