linux-kernel - [PATCH v3 0/2] kprobes/x86: Fix up interaction between kprobes code recovery and ftrace

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Date:	Fri, 20 Feb 2015 15:07:28 +0100
From:	Petr Mladek <pmladek@...e.cz>
To:	Ingo Molnar <mingo@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Ananth NMavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.cz>
Subject: [PATCH v3 0/2] kprobes/x86: Fix up interaction between kprobes code recovery and ftrace

The code affected by ftrace was not properly recovered in Kprobe checks.
Also the address returned by ftrace can be used for a consistency check.

This version is based on the feedback for the separate patches, see
https://lkml.org/lkml/2015/2/20/91 and
https://lkml.org/lkml/2015/2/20/90


Changes against v2:

  + avoid using MCOUNT_INSN_SIZE that is available only with
    CONFIG_FUNCTION_TRACER enabled

  + use WARN_ON() instead of BUG_ON() and correctly handle the
    situation when Kprobe is not able to recover the code


Changes against v1:

  + always use 5-byte NOP for ftrace location
  + fix indentation of the touched comment

Petr Mladek (2):
  kprobes/x86: Use 5-byte NOP when the code might be modified by ftrace
  kprobes/x86: Check for invalid ftrace location in
    __recover_probed_insn()

 arch/x86/kernel/kprobes/core.c | 54 +++++++++++++++++++++++++++++++-----------
 arch/x86/kernel/kprobes/opt.c  |  2 ++
 2 files changed, 42 insertions(+), 14 deletions(-)

-- 
1.8.5.6

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