Patch "ftrace: Remove incorrect setting of glob search field" has been added to the 4.14-stable tree

Patch "ftrace: Remove incorrect setting of glob search field" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ftrace: Remove incorrect setting of glob search field

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ftrace-remove-incorrect-setting-of-glob-search-field.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 7b6586562708d2b3a04fe49f217ddbadbbbb0546 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Date: Mon, 5 Feb 2018 22:05:31 -0500
Subject: ftrace: Remove incorrect setting of glob search field

From: Steven Rostedt (VMware) <rostedt@goodmis.org>

commit 7b6586562708d2b3a04fe49f217ddbadbbbb0546 upstream.

__unregister_ftrace_function_probe() will incorrectly parse the glob filter
because it resets the search variable that was setup by filter_parse_regex().

Al Viro reported this:

    After that call of filter_parse_regex() we could have func_g.search not
    equal to glob only if glob started with '!' or '*'.  In the former case
    we would've buggered off with -EINVAL (not = 1).  In the latter we
    would've set func_g.search equal to glob + 1, calculated the length of
    that thing in func_g.len and proceeded to reset func_g.search back to
    glob.

    Suppose the glob is e.g. *foo*.  We end up with
	    func_g.type = MATCH_MIDDLE_ONLY;
	    func_g.len = 3;
	    func_g.search = "*foo";
    Feeding that to ftrace_match_record() will not do anything sane - we
    will be looking for names containing "*foo" (->len is ignored for that
    one).

Link: http://lkml.kernel.org/r/20180127031706.GE13338@ZenIV.linux.org.uk

Fixes: 3ba009297149f ("ftrace: Introduce ftrace_glob structure")
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/trace/ftrace.c |    1 -
 1 file changed, 1 deletion(-)

--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4488,7 +4488,6 @@ unregister_ftrace_function_probe_func(ch
 		func_g.type = filter_parse_regex(glob, strlen(glob),
 						 &func_g.search, &not);
 		func_g.len = strlen(func_g.search);
-		func_g.search = glob;
 
 		/* we do not support '!' for function probes */
 		if (WARN_ON(not))


Patches currently in stable-queue which might be from rostedt@goodmis.org are

queue-4.14/sched-rt-use-container_of-to-get-root-domain-in-rto_push_irq_work_func.patch
queue-4.14/ftrace-remove-incorrect-setting-of-glob-search-field.patch
queue-4.14/sched-rt-up-the-root-domain-ref-count-when-passing-it-around-via-ipis.patch