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-rw-r--r--include/linux/trace_events.h1
-rw-r--r--kernel/trace/trace.h1
-rw-r--r--kernel/trace/trace_events_filter.c32
-rw-r--r--kernel/trace/trace_events_hist.c21
-rw-r--r--kernel/trace/trace_events_inject.c11
5 files changed, 60 insertions, 6 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 2d167ac3452c..3900404aa063 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -782,6 +782,7 @@ enum {
FILTER_OTHER = 0,
FILTER_STATIC_STRING,
FILTER_DYN_STRING,
+ FILTER_RDYN_STRING,
FILTER_PTR_STRING,
FILTER_TRACE_FN,
FILTER_COMM,
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 38715aa6cfdf..5db2bec8ca7e 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1465,6 +1465,7 @@ struct filter_pred {
static inline bool is_string_field(struct ftrace_event_field *field)
{
return field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_RDYN_STRING ||
field->filter_type == FILTER_STATIC_STRING ||
field->filter_type == FILTER_PTR_STRING ||
field->filter_type == FILTER_COMM;
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index c9124038b140..996920ed1812 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -706,6 +706,29 @@ static int filter_pred_strloc(struct filter_pred *pred, void *event)
return match;
}
+/*
+ * Filter predicate for relative dynamic sized arrays of characters.
+ * These are implemented through a list of strings at the end
+ * of the entry as same as dynamic string.
+ * The difference is that the relative one records the location offset
+ * from the field itself, not the event entry.
+ */
+static int filter_pred_strrelloc(struct filter_pred *pred, void *event)
+{
+ u32 *item = (u32 *)(event + pred->offset);
+ u32 str_item = *item;
+ int str_loc = str_item & 0xffff;
+ int str_len = str_item >> 16;
+ char *addr = (char *)(&item[1]) + str_loc;
+ int cmp, match;
+
+ cmp = pred->regex.match(addr, &pred->regex, str_len);
+
+ match = cmp ^ pred->not;
+
+ return match;
+}
+
/* Filter predicate for CPUs. */
static int filter_pred_cpu(struct filter_pred *pred, void *event)
{
@@ -756,7 +779,7 @@ static int filter_pred_none(struct filter_pred *pred, void *event)
*
* Note:
* - @str might not be NULL-terminated if it's of type DYN_STRING
- * or STATIC_STRING, unless @len is zero.
+ * RDYN_STRING, or STATIC_STRING, unless @len is zero.
*/
static int regex_match_full(char *str, struct regex *r, int len)
@@ -1083,6 +1106,9 @@ int filter_assign_type(const char *type)
if (strstr(type, "__data_loc") && strstr(type, "char"))
return FILTER_DYN_STRING;
+ if (strstr(type, "__rel_loc") && strstr(type, "char"))
+ return FILTER_RDYN_STRING;
+
if (strchr(type, '[') && strstr(type, "char"))
return FILTER_STATIC_STRING;
@@ -1318,8 +1344,10 @@ static int parse_pred(const char *str, void *data,
pred->fn = filter_pred_string;
pred->regex.field_len = field->size;
- } else if (field->filter_type == FILTER_DYN_STRING)
+ } else if (field->filter_type == FILTER_DYN_STRING) {
pred->fn = filter_pred_strloc;
+ } else if (field->filter_type == FILTER_RDYN_STRING)
+ pred->fn = filter_pred_strrelloc;
else
pred->fn = filter_pred_pchar;
/* go past the last quote */
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 319f9c8ca7e7..9b8da439149c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -217,6 +217,20 @@ static u64 hist_field_dynstring(struct hist_field *hist_field,
return (u64)(unsigned long)addr;
}
+static u64 hist_field_reldynstring(struct hist_field *hist_field,
+ struct tracing_map_elt *elt,
+ struct trace_buffer *buffer,
+ struct ring_buffer_event *rbe,
+ void *event)
+{
+ u32 *item = event + hist_field->field->offset;
+ u32 str_item = *item;
+ int str_loc = str_item & 0xffff;
+ char *addr = (char *)&item[1] + str_loc;
+
+ return (u64)(unsigned long)addr;
+}
+
static u64 hist_field_pstring(struct hist_field *hist_field,
struct tracing_map_elt *elt,
struct trace_buffer *buffer,
@@ -1956,8 +1970,10 @@ static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
if (field->filter_type == FILTER_STATIC_STRING) {
hist_field->fn = hist_field_string;
hist_field->size = field->size;
- } else if (field->filter_type == FILTER_DYN_STRING)
+ } else if (field->filter_type == FILTER_DYN_STRING) {
hist_field->fn = hist_field_dynstring;
+ } else if (field->filter_type == FILTER_RDYN_STRING)
+ hist_field->fn = hist_field_reldynstring;
else
hist_field->fn = hist_field_pstring;
} else {
@@ -4961,7 +4977,8 @@ static inline void add_to_key(char *compound_key, void *key,
struct ftrace_event_field *field;
field = key_field->field;
- if (field->filter_type == FILTER_DYN_STRING)
+ if (field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_RDYN_STRING)
size = *(u32 *)(rec + field->offset) >> 16;
else if (field->filter_type == FILTER_STATIC_STRING)
size = field->size;
diff --git a/kernel/trace/trace_events_inject.c b/kernel/trace/trace_events_inject.c
index c188045c5f97..d6b4935a78c0 100644
--- a/kernel/trace/trace_events_inject.c
+++ b/kernel/trace/trace_events_inject.c
@@ -168,10 +168,14 @@ static void *trace_alloc_entry(struct trace_event_call *call, int *size)
continue;
if (field->filter_type == FILTER_STATIC_STRING)
continue;
- if (field->filter_type == FILTER_DYN_STRING) {
+ if (field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_RDYN_STRING) {
u32 *str_item;
int str_loc = entry_size & 0xffff;
+ if (field->filter_type == FILTER_RDYN_STRING)
+ str_loc -= field->offset + field->size;
+
str_item = (u32 *)(entry + field->offset);
*str_item = str_loc; /* string length is 0. */
} else {
@@ -214,7 +218,8 @@ static int parse_entry(char *str, struct trace_event_call *call, void **pentry)
if (field->filter_type == FILTER_STATIC_STRING) {
strlcpy(entry + field->offset, addr, field->size);
- } else if (field->filter_type == FILTER_DYN_STRING) {
+ } else if (field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_RDYN_STRING) {
int str_len = strlen(addr) + 1;
int str_loc = entry_size & 0xffff;
u32 *str_item;
@@ -229,6 +234,8 @@ static int parse_entry(char *str, struct trace_event_call *call, void **pentry)
strlcpy(entry + (entry_size - str_len), addr, str_len);
str_item = (u32 *)(entry + field->offset);
+ if (field->filter_type == FILTER_RDYN_STRING)
+ str_loc -= field->offset + field->size;
*str_item = (str_len << 16) | str_loc;
} else {
char **paddr;