3.16.72-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Masami Hiramatsu <[email protected]> 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 <[email protected]> Tested-by: Andrea Righi <[email protected]> Signed-off-by: Masami Hiramatsu <[email protected]> Acked-by: Steven Rostedt <[email protected]> Acked-by: Steven Rostedt (VMware) <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Link: http://lkml.kernel.org/r/155094062044.6137.6419622920568680640.stgit@devbox Signed-off-by: Ingo Molnar <[email protected]> [bwh: Backported to 3.16: there is no ftrace_ops_assist_func()] Signed-off-by: Ben Hutchings <[email protected]> --- --- 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)
