Since the ORC unwinder from pt_regs requires setting up regs->ip
correctly, set the correct return address to the regs->ip before
calling user kretprobe handler.
This allows the kretrprobe handler to trace stack from the
kretprobe's pt_regs by stack_trace_save_regs() (eBPF will do
this), instead of stack tracing from the handler context by
stack_trace_save() (ftrace will do this).
Link: https://lkml.kernel.org/r/163163053237.489837.4272653874525136832.stgit@devnote2
Suggested-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Tested-by: Andrii Nakryiko <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Masami Hiramatsu
df91c5bccb