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tracing/kprobes: Do the notrace functions check without kprobes on ftrace
authorMasami Hiramatsu <mhiramat@kernel.org>
Fri, 8 Jan 2021 04:19:38 +0000 (13:19 +0900)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 19 Jan 2021 17:22:35 +0000 (18:22 +0100)
commit4ec3187d17c6915f02e40b2c7b1f41d0fdda1eb4
treeff430e1a2a3babb11e340547bbd44927e08b45de
parentd0e0af83a8d701569382692a4ee1b232413b1e9e
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>
kernel/trace/Kconfig
kernel/trace/trace_kprobe.c