[PATCH -tip v3 0/2] kprobes/x86: Another way to make insn buffer RO and cleanup

[Masami Hiramatsu <mhiramat@kernel.org>]

Hi,

This series modifies how to handle RO insn buffer and
cleans up addressof operators.

The 1st patch changes the RO insn buffer handling: instead
of using set_memory_ro/rw to modify the buffer, it prepares
new instructions in another buffer and write it with
text_poke() as suggested by Ingo Molnar (Thanks!).
Since the text_poke() is safely modifying code by
mapping alias pages, it can write RO pages.
This also override alloc_insn_page() so that it returns
ROX page directly.

The 2nd one is not changed. It is a cleanup patch
to remove addressof operators ("&") since
it is meaningless anymore.

V3 has just a following update:
 - [1/2] Not to just add set_memory_ro(), introduce new
   patch to change the way to handle RO pages.

Thanks,

---

Masami Hiramatsu (2):
      kprobes/x86: Make insn buffer always ROX and use text_poke
      kprobes/x86: Remove addressof operators


 arch/x86/include/asm/kprobes.h   |    4 +-
 arch/x86/kernel/kprobes/common.h |    6 ++-
 arch/x86/kernel/kprobes/core.c   |   61 +++++++++++++++++++++------------
 arch/x86/kernel/kprobes/opt.c    |   71 +++++++++++++++++++++-----------------
 kernel/kprobes.c                 |    2 +
 5 files changed, 86 insertions(+), 58 deletions(-)

--
Masami Hiramatsu <mhiramat@kernel.org>