3.16.72-rc1 review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu mhiramat@kernel.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@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 Link: http://lkml.kernel.org/r/155094062044.6137.6419622920568680640.stgit@devbox Signed-off-by: Ingo Molnar mingo@kernel.org [bwh: Backported to 3.16: there is no ftrace_ops_assist_func()] Signed-off-by: Ben Hutchings ben@decadent.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)