Re: [PATCH 4/4] arm64: implement KPROBES_ON_FTRACE

From: Naveen N. Rao
Date: Mon Aug 19 2019 - 12:52:25 EST

Jisheng Zhang wrote:
This patch implements KPROBES_ON_FTRACE for arm64.

~ # mount -t debugfs debugfs /sys/kernel/debug/
~ # cd /sys/kernel/debug/
/sys/kernel/debug # echo 'p _do_fork' > tracing/kprobe_events

before the patch:

/sys/kernel/debug # cat kprobes/list
ffffff801009ff7c k _do_fork+0x4 [DISABLED]

This looks wrong -- we should not be allowing kprobe to be registered on ftrace address without KPROBES_ON_FTRACE. Is _do_fork+0x4 the location of ftrace entry on arm64?

- Naveen