linux-kernel - [PATCH 3.16 097/157] kprobes: Mark ftrace mcount handler functions nokprobe

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Message-ID: <lsq.1565469607.139165272@decadent.org.uk>
Date:   Sat, 10 Aug 2019 21:40:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Masami Hiramatsu" <mhiramat@...nel.org>,
        "Ingo Molnar" <mingo@...nel.org>,
        "Francis Deslauriers" <francis.deslauriers@...icios.com>,
        "Andrea Righi" <righi.andrea@...il.com>
Subject: [PATCH 3.16 097/157] kprobes: Mark ftrace mcount handler
 functions nokprobe

3.16.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <mhiramat@...nel.org>

commit fabe38ab6b2bd9418350284c63825f13b8a6abba upstream.

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>
Link: http://lkml.kernel.org/r/155094062044.6137.6419622920568680640.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[bwh: Backported to 3.16: there is no ftrace_ops_assist_func()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -32,6 +32,7 @@
 #include <linux/list.h>
 #include <linux/hash.h>
 #include <linux/rcupdate.h>
+#include <linux/kprobes.h>
 
 #include <trace/events/sched.h>
 
@@ -4508,7 +4509,7 @@ static struct ftrace_ops control_ops = {
 	INIT_OPS_HASH(control_ops)
 };
 
-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)
 {
@@ -4561,11 +4562,13 @@ static void ftrace_ops_list_func(unsigne
 {
 	__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
 
 static void clear_ftrace_swapper(void)