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kprobes: Mark ftrace mcount handler functions nokprobe

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commit fabe38ab6b 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@efficios.com>
Tested-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/155094062044.6137.6419622920568680640.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu 2019-02-24 01:50:20 +09:00 committed by Greg Kroah-Hartman
parent 1fab567a27
commit 426e2a8024
1 changed files with 5 additions and 1 deletions
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6
kernel/trace/ftrace.c
View file

@ -34,6 +34,7 @@
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/rcupdate.h>
#include <linux/kprobes.h>
#include <trace/events/sched.h>
@ -6250,7 +6251,7 @@ 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)
{
@ -6310,11 +6311,13 @@ 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
/*
@ -6341,6 +6344,7 @@ 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