linux-kernel - [tip:perf/urgent] kprobes: Mark ftrace mcount handler functions nokprobe

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Date:   Fri, 19 Apr 2019 05:53:43 -0700
From:   tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, mhiramat@...nel.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org, righi.andrea@...il.com, tglx@...utronix.de,
        mathieu.desnoyers@...icios.com, francis.deslauriers@...icios.com,
        rostedt@...dmis.org, mingo@...nel.org,
        torvalds@...ux-foundation.org
Subject: [tip:perf/urgent] kprobes: Mark ftrace mcount handler functions
 nokprobe

Commit-ID:  fabe38ab6b2bd9418350284c63825f13b8a6abba
Gitweb:     https://git.kernel.org/tip/fabe38ab6b2bd9418350284c63825f13b8a6abba
Author:     Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Sun, 24 Feb 2019 01:50:20 +0900
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 19 Apr 2019 14:26:06 +0200

kprobes: Mark ftrace mcount handler functions nokprobe

Mark ftrace mcount handler functions nokprobe since
probing on these functions with kretprobe pushes
return address incorrectly on kretprobe shadow stack.

Reported-by: Francis Deslauriers <francis.deslauriers@...icios.com>
Tested-by: Andrea Righi <righi.andrea@...il.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: stable@...r.kernel.org
Link: http://lkml.kernel.org/r/155094062044.6137.6419622920568680640.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/trace/ftrace.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 26c8ca9bd06b..b920358dd8f7 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -33,6 +33,7 @@
 #include <linux/list.h>
 #include <linux/hash.h>
 #include <linux/rcupdate.h>
+#include <linux/kprobes.h>
 
 #include <trace/events/sched.h>
 
@@ -6246,7 +6247,7 @@ void ftrace_reset_array_ops(struct trace_array *tr)
 	tr->ops->func = ftrace_stub;
 }
 
-static inline void
+static nokprobe_inline void
 __ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 		       struct ftrace_ops *ignored, struct pt_regs *regs)
 {
@@ -6306,11 +6307,13 @@ static void ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
 {
 	__ftrace_ops_list_func(ip, parent_ip, NULL, regs);
 }
+NOKPROBE_SYMBOL(ftrace_ops_list_func);
 #else
 static void ftrace_ops_no_ops(unsigned long ip, unsigned long parent_ip)
 {
 	__ftrace_ops_list_func(ip, parent_ip, NULL, NULL);
 }
+NOKPROBE_SYMBOL(ftrace_ops_no_ops);
 #endif
 
 /*
@@ -6337,6 +6340,7 @@ static void ftrace_ops_assist_func(unsigned long ip, unsigned long parent_ip,
 	preempt_enable_notrace();
 	trace_clear_recursion(bit);
 }
+NOKPROBE_SYMBOL(ftrace_ops_assist_func);
 
 /**
  * ftrace_ops_get_func - get the function a trampoline should call