tracing/kprobes: Do the notrace functions check without kprobes on ftrace

commit 7bb83f6fc4ee84e95d0ac0d14452c2619fb3fe70 upstream.

Enable the notrace function check on the architecture which doesn't
support kprobes on ftrace but support dynamic ftrace. This notrace
function check is not only for the kprobes on ftrace but also
sw-breakpoint based kprobes.
Thus there is no reason to limit this check for the arch which
supports kprobes on ftrace.

This also changes the dependency of Kconfig. Because kprobe event
uses the function tracer's address list for identifying notrace
function, if the CONFIG_DYNAMIC_FTRACE=n, it can not check whether
the target function is notrace or not.

Link: https://lkml.kernel.org/r/20210105065730.2634785-1-naveen.n.rao@linux.vnet.ibm.com
Link: https://lkml.kernel.org/r/161007957862.114704.4512260007555399463.stgit@devnote2
Cc: stable@vger.kernel.org
Fixes: 45408c4f92506 ("tracing: kprobes: Prohibit probing on notrace function")
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index f3f2fc8ad81aaccb6f7c0a3156ef844ade40be88..9fa01dad655b4e6dfd52780f4ddf84e90ec1cb9c 100644 (file)
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -478,7 +478,7 @@ config KPROBE_EVENTS
 config KPROBE_EVENTS_ON_NOTRACE
        bool "Do NOT protect notrace function from kprobe events"
        depends on KPROBE_EVENTS
-       depends on KPROBES_ON_FTRACE
+       depends on DYNAMIC_FTRACE
        default n
        help
          This is only for the developers who want to debug ftrace itself

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 26de9c65495661ec09e31f3fb1e647821d6861a5..1074a69beff3f9907ebd0400dd245dfe8c0eb79e 100644 (file)
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -433,7 +433,7 @@ static int disable_trace_kprobe(struct trace_event_call *call,
        return 0;
 }
 
-#if defined(CONFIG_KPROBES_ON_FTRACE) && \
+#if defined(CONFIG_DYNAMIC_FTRACE) && \
        !defined(CONFIG_KPROBE_EVENTS_ON_NOTRACE)
 static bool __within_notrace_func(unsigned long addr)
 {