diff options
| -rw-r--r-- | include/linux/kprobes.h | 1 | ||||
| -rw-r--r-- | kernel/kprobes.c | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index c328e4f..177bdf6 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -267,6 +267,7 @@ extern int arch_init_kprobes(void); extern void show_registers(struct pt_regs *regs); extern void kprobes_inc_nmissed_count(struct kprobe *p); extern bool arch_within_kprobe_blacklist(unsigned long addr); +extern bool arch_function_offset_within_entry(unsigned long offset); extern bool within_kprobe_blacklist(unsigned long addr); diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 699c5bc..448759d 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1875,12 +1875,25 @@ static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs) } NOKPROBE_SYMBOL(pre_handler_kretprobe); +bool __weak arch_function_offset_within_entry(unsigned long offset) +{ + return !offset; +} + int register_kretprobe(struct kretprobe *rp) { int ret = 0; struct kretprobe_instance *inst; int i; void *addr; + unsigned long offset; + + addr = kprobe_addr(&rp->kp); + if (!kallsyms_lookup_size_offset((unsigned long)addr, NULL, &offset)) + return -EINVAL; + + if (!arch_function_offset_within_entry(offset)) + return -EINVAL; if (kretprobe_blacklist_size) { addr = kprobe_addr(&rp->kp); |
