x86/kprobes: Push a fake return address at kretprobe_trampoline

Change __kretprobe_trampoline() to push the address of the
__kretprobe_trampoline() as a fake return address at the bottom
of the stack frame. This fake return address will be replaced
with the correct return address in the trampoline_handler().

With this change, the ORC unwinder can check whether the return
address is modified by kretprobes or not.

Link: https://lkml.kernel.org/r/163163054185.489837.14338744048957727386.stgit@devnote2

Signed-off-by: Masami Hiramatsu <[email protected]>
Suggested-by: Josh Poimboeuf <[email protected]>
Tested-by: Andrii Nakryiko <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>

0 files changed, 0 insertions, 0 deletions