[PATCH] tracing/filters: disallow integer values for string filters and vice versa

[PATCH] tracing/filters: disallow integer values for string filters and vice versa

[Tom Zanussi]

Make sure filters for string fields don't use integer values and vice
versa.  Getting it wrong can crash the system or produce bogus
results.  

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>

---
 kernel/trace/trace_events_filter.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 9fca8bb..026be41 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -237,9 +237,14 @@ int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
 	pred->offset = field->offset;
 
 	if (is_string_field(field->type)) {
+		if (!pred->str_val)
+			return -EINVAL;
 		pred->fn = filter_pred_string;
 		pred->str_len = field->size;
 		return __filter_add_pred(call, pred);
+	} else {
+		if (pred->str_val)
+			return -EINVAL;
 	}
 
 	switch (field->size) {
-- 
1.5.6.3

[tip:tracing/filters] tracing/filters: disallow integer values for string filters and vice versa

[Tom Zanussi]

Commit-ID:  9f58a159d022c8f2533a27708aa267adf4f0e3ce
Gitweb:     http://git.kernel.org/tip/9f58a159d022c8f2533a27708aa267adf4f0e3ce
Author:     Tom Zanussi <tzanussi@gmail.com>
AuthorDate: Tue, 24 Mar 2009 02:14:42 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Tue, 24 Mar 2009 08:26:52 +0100

tracing/filters: disallow integer values for string filters and vice versa

Impact: fix filter use boundary condition / crash

Make sure filters for string fields don't use integer values and vice
versa.  Getting it wrong can crash the system or produce bogus
results.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237878882.8339.61.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 kernel/trace/trace_events_filter.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 9fca8bb..026be41 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -237,9 +237,14 @@ int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
 	pred->offset = field->offset;
 
 	if (is_string_field(field->type)) {
+		if (!pred->str_val)
+			return -EINVAL;
 		pred->fn = filter_pred_string;
 		pred->str_len = field->size;
 		return __filter_add_pred(call, pred);
+	} else {
+		if (pred->str_val)
+			return -EINVAL;
 	}
 
 	switch (field->size) {

[tip:tracing/filters] tracing: filter fix for TRACE_EVENT_FORMAT events

[Tom Zanussi]

Commit-ID:  9a8118baaeb0eaa148913bed77bf9c6335f6ca63
Gitweb:     http://git.kernel.org/tip/9a8118baaeb0eaa148913bed77bf9c6335f6ca63
Author:     Tom Zanussi <tzanussi@gmail.com>
AuthorDate: Thu, 26 Mar 2009 01:24:34 -0500
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 26 Mar 2009 09:13:14 +0100

tracing: filter fix for TRACE_EVENT_FORMAT events

Impact: fix crash (hang) when using TRACE_EVENT_FORMAT filter files

filters are only hooked up to the tracepoint events defined using
TRACE_EVENT but not the tracers that use TRACE_EVENT_FORMAT, such
as ftrace.

Do not display the filter files at all for TRACE_EVENT_FORMAT events
for the time being.

Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?Fr=E9d=E9ric?= Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1237878882.8339.61.camel@charm-linux>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
 kernel/trace/trace_events.c |   18 +++++-------------
 1 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index d132997..64ec4d2 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -680,7 +680,6 @@ static struct dentry *
 event_subsystem_dir(const char *name, struct dentry *d_events)
 {
 	struct event_subsystem *system;
-	struct dentry *entry;
 
 	/* First see if we did not already create this dir */
 	list_for_each_entry(system, &event_subsystems, list) {
@@ -709,12 +708,6 @@ event_subsystem_dir(const char *name, struct dentry *d_events)
 
 	system->preds = NULL;
 
-	entry = debugfs_create_file("filter", 0644, system->entry, system,
-				    &ftrace_subsystem_filter_fops);
-	if (!entry)
-		pr_warning("Could not create debugfs "
-			   "'%s/filter' entry\n", name);
-
 	return system->entry;
 }
 
@@ -770,14 +763,13 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events)
 				   " events/%s\n", call->name);
 			return ret;
 		}
+		entry = debugfs_create_file("filter", 0644, call->dir, call,
+					    &ftrace_event_filter_fops);
+		if (!entry)
+			pr_warning("Could not create debugfs "
+				   "'%s/filter' entry\n", call->name);
 	}
 
-	entry = debugfs_create_file("filter", 0644, call->dir, call,
-				    &ftrace_event_filter_fops);
-	if (!entry)
-		pr_warning("Could not create debugfs "
-			   "'%s/filter' entry\n", call->name);
-
 	/* A trace may not want to export its format */
 	if (!call->show_format)
 		return 0;