diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2009-04-21 17:12:11 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-21 11:58:28 +0200 |
| commit | f66578a7637b87810cbb9041c4e3a77fd2fa4706 (patch) | |
| tree | 13b4ac67791369daa1b9559f427e128a70e6b9aa /kernel | |
| parent | e8082f3f5a17d7a7bfc7dd1050a3f958dc034e9a (diff) | |
tracing/filters: allow user-input to be integer-like string
Suppose we would like to trace all tasks named '123', but this
will fail:
# echo 'parent_comm == 123' > events/sched/sched_process_fork/filter
bash: echo: write error: Invalid argument
Don't guess the type of the filter pred in filter_parse(), but instead
we check it in __filter_add_pred().
[ Impact: extend allowed filter field string values ]
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <49ED8DEB.6000700@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_events_filter.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index e0fcfd2a16d..65418288f95 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -313,6 +313,7 @@ static int __filter_add_pred(struct ftrace_event_call *call, { struct ftrace_event_field *field; filter_pred_fn_t fn; + unsigned long long val; field = find_event_field(call, pred->field_name); if (!field) @@ -322,14 +323,13 @@ static int __filter_add_pred(struct ftrace_event_call *call, pred->offset = field->offset; if (is_string_field(field->type)) { - if (!pred->str_len) - return -EINVAL; fn = filter_pred_string; pred->str_len = field->size; return filter_add_pred_fn(call, pred, fn); } else { - if (pred->str_len) + if (strict_strtoull(pred->str_val, 0, &val)) return -EINVAL; + pred->val = val; } switch (field->size) { @@ -413,12 +413,16 @@ int filter_add_subsystem_pred(struct event_subsystem *system, return 0; } +/* + * The filter format can be + * - 0, which means remove all filter preds + * - [||/&&] <field> ==/!= <val> + */ int filter_parse(char **pbuf, struct filter_pred *pred) { - char *tmp, *tok, *val_str = NULL; + char *tok, *val_str = NULL; int tok_n = 0; - /* field ==/!= number, or/and field ==/!= number, number */ while ((tok = strsep(pbuf, " \n"))) { if (tok_n == 0) { if (!strcmp(tok, "0")) { @@ -478,19 +482,13 @@ int filter_parse(char **pbuf, struct filter_pred *pred) return -EINVAL; } + strcpy(pred->str_val, val_str); + pred->str_len = strlen(val_str); + pred->field_name = kstrdup(pred->field_name, GFP_KERNEL); if (!pred->field_name) return -ENOMEM; - pred->str_len = 0; - pred->val = simple_strtoull(val_str, &tmp, 0); - if (tmp == val_str) { - strncpy(pred->str_val, val_str, MAX_FILTER_STR_VAL); - pred->str_len = strlen(val_str); - pred->str_val[pred->str_len] = '\0'; - } else if (*tmp != '\0') - return -EINVAL; - return 0; } |