diff options
Diffstat (limited to 'kernel/events/uprobes.c')
| -rw-r--r-- | kernel/events/uprobes.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index 65429ad2ce51..6ab00e090c87 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -1404,6 +1404,13 @@ static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs) if (!utask) return; + if (utask->depth >= MAX_URETPROBE_DEPTH) { + printk_ratelimited(KERN_INFO "uprobe: omit uretprobe due to" + " nestedness limit pid/tgid=%d/%d\n", + current->pid, current->tgid); + return; + } + ri = kzalloc(sizeof(struct return_instance), GFP_KERNEL); if (!ri) goto fail; @@ -1439,6 +1446,8 @@ static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs) ri->orig_ret_vaddr = orig_ret_vaddr; ri->chained = chained; + utask->depth++; + /* add instance to the stack */ ri->next = utask->return_instances; utask->return_instances = ri; @@ -1681,6 +1690,8 @@ static bool handle_trampoline(struct pt_regs *regs) if (!chained) break; + utask->depth--; + BUG_ON(!ri); } |