From 0192e6535ebe9af68614198ced4fd6d37b778ebf Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Wed, 13 Feb 2019 01:11:19 +0900 Subject: [PATCH] x86/kprobes: Prohibit probing on optprobe template code Prohibit probing on optprobe template code, since it is not a code but a template instruction sequence. If we modify this template, copied template must be broken. Signed-off-by: Masami Hiramatsu Cc: Alexander Shishkin Cc: Andrea Righi Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner Cc: stable@vger.kernel.org Fixes: 9326638cbee2 ("kprobes, x86: Use NOKPROBE_SYMBOL() instead of __kprobes annotation") Link: http://lkml.kernel.org/r/154998787911.31052.15274376330136234452.stgit@devbox Signed-off-by: Ingo Molnar --- arch/x86/kernel/kprobes/opt.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c index 6adf6e6c2933..544bd41a514c 100644 --- a/arch/x86/kernel/kprobes/opt.c +++ b/arch/x86/kernel/kprobes/opt.c @@ -141,6 +141,11 @@ asm ( void optprobe_template_func(void); STACK_FRAME_NON_STANDARD(optprobe_template_func); +NOKPROBE_SYMBOL(optprobe_template_func); +NOKPROBE_SYMBOL(optprobe_template_entry); +NOKPROBE_SYMBOL(optprobe_template_val); +NOKPROBE_SYMBOL(optprobe_template_call); +NOKPROBE_SYMBOL(optprobe_template_end); #define TMPL_MOVE_IDX \ ((long)optprobe_template_val - (long)optprobe_template_entry) -- 2.45.2