linux-kernel - [tip:perf/core] x86/kprobes: Prohibit probing on optprobe template code

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Message-ID: <tip-0192e6535ebe9af68614198ced4fd6d37b778ebf@git.kernel.org>
Date:   Wed, 13 Feb 2019 00:58:54 -0800
From:   tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     righi.andrea@...il.com, jolsa@...hat.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de, hpa@...or.com,
        peterz@...radead.org, alexander.shishkin@...ux.intel.com,
        mathieu.desnoyers@...icios.com, mingo@...nel.org, acme@...hat.com,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mhiramat@...nel.org
Subject: [tip:perf/core] x86/kprobes: Prohibit probing on optprobe template
 code

Commit-ID:  0192e6535ebe9af68614198ced4fd6d37b778ebf
Gitweb:     https://git.kernel.org/tip/0192e6535ebe9af68614198ced4fd6d37b778ebf
Author:     Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Wed, 13 Feb 2019 01:11:19 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 13 Feb 2019 08:16:39 +0100

x86/kprobes: Prohibit probing on optprobe template code

Prohibit probing on optprobe template code, since it is not
a code but a template instruction sequence. If we modify
this template, copied template must be broken.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andrea Righi <righi.andrea@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Fixes: 9326638cbee2 ("kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation")
Link: http://lkml.kernel.org/r/154998787911.31052.15274376330136234452.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/kprobes/opt.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index 6adf6e6c2933..544bd41a514c 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -141,6 +141,11 @@ asm (
 
 void optprobe_template_func(void);
 STACK_FRAME_NON_STANDARD(optprobe_template_func);
+NOKPROBE_SYMBOL(optprobe_template_func);
+NOKPROBE_SYMBOL(optprobe_template_entry);
+NOKPROBE_SYMBOL(optprobe_template_val);
+NOKPROBE_SYMBOL(optprobe_template_call);
+NOKPROBE_SYMBOL(optprobe_template_end);
 
 #define TMPL_MOVE_IDX \
 	((long)optprobe_template_val - (long)optprobe_template_entry)