[PATCH v13 bpf-next 0/1] fprobe: Introduce fprobe function entry/exit probe

[Masami Hiramatsu <mhiramat@kernel.org>]

Hi,

Here is the 13th version of rethook x86 port. This is developed for a part
of fprobe series [1] for hooking function return. But since I forgot to send
it to arch maintainers, that caused conflict with IBT and SLS mitigation series.
Now I picked the x86 rethook part and send it to x86 maintainers to be
reviewed.

[1] https://lore.kernel.org/all/164735281449.1084943.12438881786173547153.stgit@devnote2/T/#u

Note that this patch is still for the bpf-next since the rethook itself
is on the bpf-next tree. But since this also uses the ANNOTATE_NOENDBR
macro which has been introduced by IBT/ENDBR patch, to build this series
you need to merge the tip/master branch with the bpf-next.
(hopefully, it is rebased soon)

The fprobe itself is for providing the function entry/exit probe
with multiple probe point. The rethook is a sub-feature to hook the
function return as same as kretprobe does. Eventually, I would like
to replace the kretprobe's trampoline with this rethook.

Thank you,

---

Masami Hiramatsu (1):
      rethook: x86: Add rethook x86 implementation


 arch/x86/Kconfig                 |    1 
 arch/x86/include/asm/unwind.h    |    8 ++-
 arch/x86/kernel/Makefile         |    1 
 arch/x86/kernel/kprobes/common.h |    1 
 arch/x86/kernel/rethook.c        |  121 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 131 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/kernel/rethook.c

--
Masami Hiramatsu (Linaro) <mhiramat@kernel.org>