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 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: ftrace-remove-incorrect-setting-of-glob-search-field.patch and it can be found in the queue-4.4 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 @@ -3845,7 +3845,6 @@ __unregister_ftrace_function_probe(char func_g.type = filter_parse_regex(glob, strlen(glob), &func_g.search, ¬); 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-4.4/sched-rt-use-container_of-to-get-root-domain-in-rto_push_irq_work_func.patch queue-4.4/ftrace-remove-incorrect-setting-of-glob-search-field.patch queue-4.4/sched-rt-up-the-root-domain-ref-count-when-passing-it-around-via-ipis.patch