[PATCH v2 00/15] kprobes: Unify kretprobe trampoline handlers

[Masami Hiramatsu]

Hi,

Here is the 2nd version of the series to unify the kretprobe trampoline handler
implementation across all architectures which are currently kprobes supported.
Previous version is here;

 https://lkml.kernel.org/r/159844957216.510284.17683703701627367133.stgit@devnote2

This series removes the in_nmi() check from pre_kretprobe_handler() since we
can avoid double-lock deadlock from NMI by kprobe_busy_begin/end().
In this version, I also add a patch to use kfree_rcu() for freeing kretprobe
instance objects so that we don't call kfree() in NMI context directly.

The unified generic kretprobe trampoline handler is based on x86 code, which
already support frame-pointer checker. The checker is enabled on arm and arm64
too because I can test it. For other architecutres, currently the checker
is not enabled. If someone wants to enable it, please set the correct
frame pointer to ri->fp and pass it to kretprobe_trampoline_handler() as the
3rd parameter, instead of NULL.

Thank you,

---

Masami Hiramatsu (15):
      kprobes: Add generic kretprobe trampoline handler
      x86/kprobes: Use generic kretprobe trampoline handler
      arm: kprobes: Use generic kretprobe trampoline handler
      arm64: kprobes: Use generic kretprobe trampoline handler
      arc: kprobes: Use generic kretprobe trampoline handler
      csky: kprobes: Use generic kretprobe trampoline handler
      ia64: kprobes: Use generic kretprobe trampoline handler
      mips: kprobes: Use generic kretprobe trampoline handler
      parisc: kprobes: Use generic kretprobe trampoline handler
      powerpc: kprobes: Use generic kretprobe trampoline handler
      s390: kprobes: Use generic kretprobe trampoline handler
      sh: kprobes: Use generic kretprobe trampoline handler
      sparc: kprobes: Use generic kretprobe trampoline handler
      kprobes: Remove NMI context check
      kprobes: Free kretprobe_instance with rcu callback


 arch/arc/kernel/kprobes.c          |   55 +---------------
 arch/arm/probes/kprobes/core.c     |   79 +----------------------
 arch/arm64/kernel/probes/kprobes.c |   79 +----------------------
 arch/csky/kernel/probes/kprobes.c  |   78 +---------------------
 arch/ia64/kernel/kprobes.c         |   79 +----------------------
 arch/mips/kernel/kprobes.c         |   55 +---------------
 arch/parisc/kernel/kprobes.c       |   78 ++--------------------
 arch/powerpc/kernel/kprobes.c      |   55 +---------------
 arch/s390/kernel/kprobes.c         |   81 +----------------------
 arch/sh/kernel/kprobes.c           |   59 +----------------
 arch/sparc/kernel/kprobes.c        |   52 +--------------
 arch/x86/kernel/kprobes/core.c     |  109 +------------------------------
 include/linux/kprobes.h            |   35 +++++++++-
 kernel/kprobes.c                   |  126 +++++++++++++++++++++++++++++-------
 14 files changed, 182 insertions(+), 838 deletions(-)

--
Masami Hiramatsu (Linaro) <mhiramat@xxxxxxxxxx>