diff options
Diffstat (limited to 'arch/mips/kernel/kprobes.c')
| -rw-r--r-- | arch/mips/kernel/kprobes.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/mips/kernel/kprobes.c b/arch/mips/kernel/kprobes.c index ee28683..9fb1876 100644 --- a/arch/mips/kernel/kprobes.c +++ b/arch/mips/kernel/kprobes.c @@ -25,6 +25,7 @@ #include <linux/kprobes.h> #include <linux/preempt.h> +#include <linux/uaccess.h> #include <linux/kdebug.h> #include <linux/slab.h> @@ -118,11 +119,19 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) union mips_instruction prev_insn; int ret = 0; - prev_insn = p->addr[-1]; insn = p->addr[0]; - if (insn_has_delayslot(insn) || insn_has_delayslot(prev_insn)) { - pr_notice("Kprobes for branch and jump instructions are not supported\n"); + if (insn_has_delayslot(insn)) { + pr_notice("Kprobes for branch and jump instructions are not" + "supported\n"); + ret = -EINVAL; + goto out; + } + + if ((probe_kernel_read(&prev_insn, p->addr - 1, + sizeof(mips_instruction)) == 0) && + insn_has_delayslot(prev_insn)) { + pr_notice("Kprobes for branch delayslot are not supported\n"); ret = -EINVAL; goto out; } |