4.19-stable review patch. If anyone has any objections, please let me know.
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From: Masami Hiramatsu mhiramat@kernel.org
commit 0192e6535ebe9af68614198ced4fd6d37b778ebf upstream.
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 mhiramat@kernel.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Andrea Righi righi.andrea@gmail.com Cc: Arnaldo Carvalho de Melo acme@redhat.com Cc: Jiri Olsa jolsa@redhat.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Mathieu Desnoyers mathieu.desnoyers@efficios.com Cc: Peter Zijlstra peterz@infradead.org Cc: Steven Rostedt rostedt@goodmis.org Cc: Thomas Gleixner tglx@linutronix.de 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@devbo... Signed-off-by: Ingo Molnar mingo@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/kernel/kprobes/opt.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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)