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-rw-r--r--arch/x86/kernel/uprobes.c5
-rw-r--r--include/linux/uprobes.h1
-rw-r--r--kernel/events/uprobes.c1
3 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/uprobes.c b/arch/x86/kernel/uprobes.c
index 66476244731e..58e9b842633f 100644
--- a/arch/x86/kernel/uprobes.c
+++ b/arch/x86/kernel/uprobes.c
@@ -985,3 +985,8 @@ arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr, struct pt_regs
return -1;
}
+
+bool arch_uretprobe_is_alive(struct return_instance *ret, struct pt_regs *regs)
+{
+ return regs->sp <= ret->stack;
+}
diff --git a/include/linux/uprobes.h b/include/linux/uprobes.h
index 50d2764d66a8..7ab6d2c8be49 100644
--- a/include/linux/uprobes.h
+++ b/include/linux/uprobes.h
@@ -95,6 +95,7 @@ struct uprobe_task {
struct return_instance {
struct uprobe *uprobe;
unsigned long func;
+ unsigned long stack; /* stack pointer */
unsigned long orig_ret_vaddr; /* original return address */
bool chained; /* true, if instance is nested */
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 1c71b6242a7e..c5f316e06dc0 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -1562,6 +1562,7 @@ static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs)
ri->uprobe = get_uprobe(uprobe);
ri->func = instruction_pointer(regs);
+ ri->stack = user_stack_pointer(regs);
ri->orig_ret_vaddr = orig_ret_vaddr;
ri->chained = chained;