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From: Steven Rostedt <rostedt@goodmis.org>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 1/7] trace: fix the glob match in __unregister_ftrace_function_probe()
Date: Thu, 5 Feb 2015 15:43:36 -0500	[thread overview]
Message-ID: <20150205154336.0be014e9@gandalf.local.home> (raw)
In-Reply-To: <1423166200-1800-1-git-send-email-viro@ZenIV.linux.org.uk>

On Thu,  5 Feb 2015 19:56:34 +0000
Al Viro <viro@ZenIV.linux.org.uk> wrote:

> From: Al Viro <viro@zeniv.linux.org.uk>
> 
> For patterns starting with '*' we need to match against 'search', not
> 'glob'.
> 
> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
> ---
>  kernel/trace/ftrace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index 224e768..9f90a4f 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c

Can you make search = NULL instead of glob at the start of the
function. That is:

	if (!glob || strcmp(glob, "*") == 0 || !strlen(glob))
		search = NULL;

> @@ -3802,7 +3802,7 @@ __unregister_ftrace_function_probe(char *glob, struct ftrace_probe_ops *ops,
>  			if (glob) {

And then here have

			if (search) {

>  				kallsyms_lookup(entry->ip, NULL, NULL,
>  						NULL, str);
> -				if (!ftrace_match(str, glob, len, type))
> +				if (!ftrace_match(str, search, len, type))

Otherwise I'm sure there's a gcc out there that will give a warning
about search being used uninitialized.

-- Steve

>  					continue;
>  			}
>  


  reply	other threads:[~2015-02-05 20:43 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-05 19:49 [RFC][PATCHES] constifying ftrace globs Al Viro
2015-02-05 19:56 ` [RFC][PATCH 1/7] trace: fix the glob match in __unregister_ftrace_function_probe() Al Viro
2015-02-05 20:43   ` Steven Rostedt [this message]
2015-02-05 22:30     ` Al Viro
2015-02-05 22:52       ` Steven Rostedt
2015-02-05 19:56 ` [RFC][PATCH 2/7] implement memmem() Al Viro
2015-02-05 19:56 ` [RFC][PATCH 3/7] trace_events_filter.c: switch to memcmp() and memmem() for matching Al Viro
2015-02-05 19:56 ` [RFC][PATCH 4/7] ftrace: switch matching to memcmp() and memmem() Al Viro
2015-02-05 19:56 ` [RFC][PATCH 5/7] trace: make filter_parse_regex() provide the length of substring to compare with Al Viro
2015-02-05 21:29   ` Steven Rostedt
2015-02-05 21:44     ` Al Viro
2015-02-05 22:07       ` Steven Rostedt
2015-02-05 22:46         ` Al Viro
2015-02-06  4:00           ` [RFC][PATCH v2 1/7] trace: fix the glob match in __unregister_ftrace_function_probe() Al Viro
2015-02-06  4:00           ` [RFC][PATCH v2 2/7] implement memmem() Al Viro
2015-02-06 16:19             ` Steven Rostedt
2015-02-06 22:30             ` Rasmus Villemoes
2015-02-06 22:55               ` Steven Rostedt
2015-02-06 23:14                 ` Rasmus Villemoes
2015-02-06  4:00           ` [RFC][PATCH v2 3/7] trace_events_filter.c: switch to memcmp() and memmem() for matching Al Viro
2015-02-06 16:24             ` Steven Rostedt
2015-02-06  4:00           ` [RFC][PATCH v2 4/7] ftrace: switch matching to memcmp() and memmem() Al Viro
2015-02-06  4:00           ` [RFC][PATCH v2 5/7] trace: make filter_parse_regex() provide the length of substring to compare with Al Viro
2015-02-06 18:55             ` Steven Rostedt
2015-02-06  4:00           ` [RFC][PATCH v2 6/7] trace: constify filter_parse_regex(), match_records(), ftrace_match() and ftrace_match_record() Al Viro
2015-02-06 18:56             ` Steven Rostedt
2015-02-06  4:00           ` [RFC][PATCH v2 7/7] trace: constify glob arguments all way up to ftrace_function_set_regexp() Al Viro
2015-02-05 19:56 ` [RFC][PATCH 6/7] trace: constify filter_parse_regex(), match_records(), ftrace_match() and ftrace_match_record() Al Viro
2015-02-05 21:31   ` Steven Rostedt
2015-02-05 19:56 ` [RFC][PATCH 7/7] trace: constify glob arguments all way up to ftrace_function_set_regexp() Al Viro
2020-01-24 23:45 ` [RFC][PATCHES] constifying ftrace globs Steven Rostedt

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