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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Ingo Molnar <mingo@redhat.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>,
	peterz@infradead.org,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	Andrea Righi <righi.andrea@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	stable@vger.kernel.org
Subject: [PATCH -tip v3 2/3] kprobes: Mark ftrace mcount handler functions nokprobe
Date: Sun, 24 Feb 2019 01:50:20 +0900
Message-ID: <155094062044.6137.6419622920568680640.stgit@devbox> (raw)
In-Reply-To: <155094056180.6137.4208463927265038015.stgit@devbox>

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@efficios.com>
Tested-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: stable@vger.kernel.org
---
 - Changes in v2:
   Fix to include kprobes.h (Thanks Andrea!)
---
 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 aac7847c0214..f546ae5102e0 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>
 
@@ -6216,7 +6217,7 @@ 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)
 {
@@ -6276,11 +6277,13 @@ 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
 
 /*
@@ -6307,6 +6310,7 @@ 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


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-23 16:49 [PATCH -tip v3 0/3] kprobes: Fix kretprobe issues Masami Hiramatsu
2019-02-23 16:49 ` [PATCH -tip v3 1/3] x86/kprobes: Verify stack frame on kretprobe Masami Hiramatsu
2019-04-19 12:52   ` [tip:perf/urgent] " tip-bot for Masami Hiramatsu
2019-02-23 16:50 ` Masami Hiramatsu [this message]
2019-04-19 12:53   ` [tip:perf/urgent] kprobes: Mark ftrace mcount handler functions nokprobe tip-bot for Masami Hiramatsu
2019-02-23 16:50 ` [PATCH -tip v3 3/3] x86/kprobes: Fix to avoid kretprobe recursion Masami Hiramatsu
2019-04-19 12:54   ` [tip:perf/urgent] x86/kprobes: Avoid kretprobe recursion bug tip-bot for Masami Hiramatsu
2019-03-22 19:37 ` [PATCH -tip v3 0/3] kprobes: Fix kretprobe issues Steven Rostedt

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