DECLARE_BITMAP(sc_exit, NR_syscalls);
DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls);
DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls);
-};
-static
-int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler);
+ /*
+ * Reference counters keeping track of number of events enabled
+ * for each bit.
+ */
+ u32 sc_entry_refcount_map[NR_syscalls];
+ u32 sc_exit_refcount_map[NR_syscalls];
+ u32 sc_compat_entry_refcount_map[NR_compat_syscalls];
+ u32 sc_compat_exit_refcount_map[NR_compat_syscalls];
+};
static void syscall_entry_event_unknown(struct hlist_head *unknown_action_list_head,
struct pt_regs *regs, long id)
if (!event_recorder_enabler)
return;
event = _lttng_kernel_event_create(&event_recorder_enabler->parent, desc);
- WARN_ON_ONCE(!event || IS_ERR(event));
+ WARN_ON_ONCE(IS_ERR(event));
lttng_event_enabler_destroy(&event_recorder_enabler->parent);
- if (!event || IS_ERR(event)) {
+ if (IS_ERR(event)) {
printk(KERN_INFO "Unable to create event recorder %s\n", desc->event_name);
return;
}
&event_notifier_param, syscall_event_notifier_enabler->group);
WARN_ON_ONCE(!event_notifier_enabler);
event = _lttng_kernel_event_create(&event_notifier_enabler->parent, desc);
- WARN_ON_ONCE(!event || IS_ERR(event));
+ WARN_ON_ONCE(IS_ERR(event));
lttng_event_enabler_destroy(&event_notifier_enabler->parent);
- if (!event || IS_ERR(event)) {
+ if (IS_ERR(event)) {
printk(KERN_INFO "Unable to create event notifier %s\n", desc->event_name);
return;
}
}
static
-void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *syscall_event_enabler_common,
- const struct trace_syscall_entry *table,
- size_t table_len,
- struct hlist_head *dispatch_table,
- enum sc_type type)
+void lttng_syscall_event_enabler_create_matching_syscall_table_events(struct lttng_event_enabler_common *syscall_event_enabler_common,
+ const struct trace_syscall_entry *table, size_t table_len, enum sc_type type)
{
struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(syscall_event_enabler_common);
const struct lttng_kernel_event_desc *desc;
unsigned int i;
- if (!IS_ENABLED(CONFIG_COMPAT) && (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT))
+#ifndef CONFIG_COMPAT
+ if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT)
return;
-
- /* iterate over all syscall and create event_notifier that match */
+#endif
+ /* iterate over all syscall and create event that match */
for (i = 0; i < table_len; i++) {
struct lttng_kernel_event_common_private *event_priv;
struct hlist_head *head;
- int found = 0;
+ bool found = false;
desc = table[i].desc;
if (!desc) {
*/
head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
- if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub))
- found = 1;
+ if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) {
+ found = true;
+ break;
+ }
}
if (found)
continue;
- lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, dispatch_table, type, i);
+ lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, NULL, type, i);
}
}
bool found = false;
struct hlist_head *head;
- if (!IS_ENABLED(CONFIG_COMPAT) && (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT))
+#ifndef CONFIG_COMPAT
+ if (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT)
return;
-
+#endif
/*
* Considering that currently system calls can only be enabled on a per
* name basis (or wildcard based on a name), unknown syscall events are
*/
head = utils_borrow_hash_table_bucket(events_ht->table, LTTNG_EVENT_HT_SIZE, desc->event_name);
lttng_hlist_for_each_entry(event_priv, head, hlist_node) {
- if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub))
+ if (lttng_event_enabler_desc_match_event(event_enabler, desc, event_priv->pub)) {
found = true;
+ break;
+ }
}
if (!found)
lttng_syscall_event_enabler_create_event(event_enabler, desc, unknown_dispatch_list, type, -1U);
}
static
-int lttng_syscalls_populate_events(struct lttng_event_enabler_common *syscall_event_enabler)
+void lttng_syscall_event_enabler_create_matching_events(struct lttng_event_enabler_common *event_enabler)
{
- struct lttng_event_recorder_enabler *event_recorder_enabler;
- struct lttng_kernel_channel_buffer *chan;
- int ret;
+ enum lttng_kernel_abi_syscall_entryexit entryexit = event_enabler->event_param.u.syscall.entryexit;
- if (syscall_event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_RECORDER)
- return 0;
- event_recorder_enabler = container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent);
- chan = event_recorder_enabler->chan;
-
- lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, sc_table.table, sc_table.len,
- NULL, SC_TYPE_ENTRY);
- lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, sc_exit_table.table, sc_exit_table.len,
- NULL, SC_TYPE_EXIT);
- create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_ENTRY);
- create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_EXIT);
-
- lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, compat_sc_table.table, compat_sc_table.len,
- NULL, SC_TYPE_COMPAT_ENTRY);
- lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, compat_sc_exit_table.table, compat_sc_exit_table.len,
- NULL, SC_TYPE_COMPAT_EXIT);
- create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_COMPAT_ENTRY);
- create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_COMPAT_EXIT);
+ if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
+ lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler,
+ sc_table.table, sc_table.len, SC_TYPE_ENTRY);
+ lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler,
+ compat_sc_table.table, compat_sc_table.len, SC_TYPE_COMPAT_ENTRY);
+ create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY);
+ create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY);
+ }
- return ret;
+ if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
+ lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler,
+ sc_exit_table.table, sc_exit_table.len, SC_TYPE_EXIT);
+ lttng_syscall_event_enabler_create_matching_syscall_table_events(event_enabler,
+ compat_sc_exit_table.table, compat_sc_exit_table.len, SC_TYPE_COMPAT_EXIT);
+ create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT);
+ create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT);
+ }
}
/*
return -ENOMEM;
}
- ret = lttng_syscalls_populate_events(syscall_event_enabler);
- if (ret)
- return ret;
-
- ret = lttng_syscalls_create_matching_event_notifiers(syscall_event_enabler);
- if (ret)
- return ret;
-
if (!syscall_table->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
(void *) syscall_entry_event_probe, syscall_table);
syscall_table->sys_exit_registered = 1;
}
- return ret;
-}
-
-static
-int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler)
-{
- int ret;
- enum lttng_kernel_abi_syscall_entryexit entryexit =
- event_enabler->event_param.u.syscall.entryexit;
- struct lttng_event_notifier_enabler *event_notifier_enabler;
-
- if (event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_NOTIFIER)
- return 0;
- event_notifier_enabler = container_of(event_enabler, struct lttng_event_notifier_enabler, parent);
+ lttng_syscall_event_enabler_create_matching_events(syscall_event_enabler);
- if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
- lttng_syscall_event_enabler_create_matching_events(&event_notifier_enabler->parent,
- sc_table.table, sc_table.len, NULL, SC_TYPE_ENTRY);
- lttng_syscall_event_enabler_create_matching_events(&event_notifier_enabler->parent,
- compat_sc_table.table, compat_sc_table.len, NULL, SC_TYPE_COMPAT_ENTRY);
- create_unknown_syscall_event(event_enabler, SC_TYPE_ENTRY);
- create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_ENTRY);
- }
-
- if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) {
- lttng_syscall_event_enabler_create_matching_events(&event_notifier_enabler->parent,
- sc_exit_table.table, sc_exit_table.len, NULL, SC_TYPE_EXIT);
- lttng_syscall_event_enabler_create_matching_events(&event_notifier_enabler->parent,
- compat_sc_exit_table.table, compat_sc_exit_table.len, NULL, SC_TYPE_COMPAT_EXIT);
- create_unknown_syscall_event(event_enabler, SC_TYPE_EXIT);
- create_unknown_syscall_event(event_enabler, SC_TYPE_COMPAT_EXIT);
- }
return ret;
}
{
const char *syscall_name;
unsigned long *bitmap;
+ u32 *refcount_map;
int syscall_nr;
syscall_name = get_syscall_name(desc_name, abi, entryexit);
switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_entry;
+ refcount_map = filter->sc_entry_refcount_map;
break;
case LTTNG_SYSCALL_ABI_COMPAT:
bitmap = filter->sc_compat_entry;
+ refcount_map = filter->sc_compat_entry_refcount_map;
break;
default:
return -EINVAL;
switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_exit;
+ refcount_map = filter->sc_exit_refcount_map;
break;
case LTTNG_SYSCALL_ABI_COMPAT:
bitmap = filter->sc_compat_exit;
+ refcount_map = filter->sc_compat_exit_refcount_map;
break;
default:
return -EINVAL;
default:
return -EINVAL;
}
- if (test_bit(syscall_nr, bitmap))
- return -EEXIST;
- bitmap_set(bitmap, syscall_nr, 1);
+ if (refcount_map[syscall_nr] == U32_MAX)
+ return -EOVERFLOW;
+ if (refcount_map[syscall_nr]++ == 0)
+ bitmap_set(bitmap, syscall_nr, 1);
return 0;
}
WARN_ON_ONCE(event->priv->instrumentation != LTTNG_KERNEL_ABI_SYSCALL);
+ /* Skip unknown syscall */
+ if (syscall_id == -1U)
+ return 0;
+
ret = lttng_syscall_filter_enable(syscall_table->sc_filter,
event->priv->desc->event_name, event->priv->u.syscall.abi,
event->priv->u.syscall.entryexit);
{
const char *syscall_name;
unsigned long *bitmap;
+ u32 *refcount_map;
int syscall_nr;
syscall_name = get_syscall_name(desc_name, abi, entryexit);
switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_entry;
+ refcount_map = filter->sc_entry_refcount_map;
break;
case LTTNG_SYSCALL_ABI_COMPAT:
bitmap = filter->sc_compat_entry;
+ refcount_map = filter->sc_compat_entry_refcount_map;
break;
default:
return -EINVAL;
switch (abi) {
case LTTNG_SYSCALL_ABI_NATIVE:
bitmap = filter->sc_exit;
+ refcount_map = filter->sc_exit_refcount_map;
break;
case LTTNG_SYSCALL_ABI_COMPAT:
bitmap = filter->sc_compat_exit;
+ refcount_map = filter->sc_compat_exit_refcount_map;
break;
default:
return -EINVAL;
default:
return -EINVAL;
}
- if (!test_bit(syscall_nr, bitmap))
- return -EEXIST;
- bitmap_clear(bitmap, syscall_nr, 1);
-
+ if (refcount_map[syscall_nr] == 0)
+ return -ENOENT;
+ if (--refcount_map[syscall_nr] == 0)
+ bitmap_clear(bitmap, syscall_nr, 1);
return 0;
}
int lttng_syscall_filter_disable_event(struct lttng_kernel_event_common *event)
{
struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_event(event);
+ unsigned int syscall_id = event->priv->u.syscall.syscall_id;
int ret;
+ /* Skip unknown syscall */
+ if (syscall_id == -1U)
+ return 0;
+
ret = lttng_syscall_filter_disable(syscall_table->sc_filter,
event->priv->desc->event_name, event->priv->u.syscall.abi,
event->priv->u.syscall.entryexit);
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