- struct lttng_channel *chan = event_enabler->chan;
- struct lttng_kernel_event ev;
- int ret;
-
- wrapper_vmalloc_sync_mappings();
-
- if (!chan->sc_table) {
- /* create syscall table mapping syscall to events */
- chan->sc_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_table), GFP_KERNEL);
- if (!chan->sc_table)
- return -ENOMEM;
- }
- if (!chan->sc_exit_table) {
- /* create syscall table mapping syscall to events */
- chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
- if (!chan->sc_exit_table)
- return -ENOMEM;
- }
-
-
-#ifdef CONFIG_COMPAT
- if (!chan->compat_sc_table) {
- /* create syscall table mapping compat syscall to events */
- chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(compat_sc_table), GFP_KERNEL);
- if (!chan->compat_sc_table)
- return -ENOMEM;
- }
-
- if (!chan->compat_sc_exit_table) {
- /* create syscall table mapping compat syscall to events */
- chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL);
- if (!chan->compat_sc_exit_table)
- return -ENOMEM;
- }
-#endif
- if (hlist_empty(&chan->sc_unknown)) {
- const struct lttng_kernel_event_desc *desc =
- &__event_desc___syscall_entry_unknown;
- struct lttng_event *event;
-
- memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->event_name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
- ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
- event = _lttng_event_create(chan, &ev, filter, desc,
- ev.instrumentation);
- WARN_ON_ONCE(!event);
- if (IS_ERR(event)) {
- return PTR_ERR(event);
- }
- hlist_add_head(&event->u.syscall.node, &chan->sc_unknown);
- }
-
- if (hlist_empty(&chan->sc_compat_unknown)) {
- const struct lttng_kernel_event_desc *desc =
- &__event_desc___compat_syscall_entry_unknown;
- struct lttng_event *event;
-
- memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->event_name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
- ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
- event = _lttng_event_create(chan, &ev, filter, desc,
- ev.instrumentation);
- WARN_ON_ONCE(!event);
- if (IS_ERR(event)) {
- return PTR_ERR(event);
- }
- hlist_add_head(&event->u.syscall.node, &chan->sc_compat_unknown);
- }
-
- if (hlist_empty(&chan->compat_sc_exit_unknown)) {
- const struct lttng_kernel_event_desc *desc =
- &__event_desc___compat_syscall_exit_unknown;
- struct lttng_event *event;
-
- memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->event_name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
- ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
- event = _lttng_event_create(chan, &ev, filter, desc,
- ev.instrumentation);
- WARN_ON_ONCE(!event);
- if (IS_ERR(event)) {
- return PTR_ERR(event);
- }
- hlist_add_head(&event->u.syscall.node, &chan->compat_sc_exit_unknown);
- }
-
- if (hlist_empty(&chan->sc_exit_unknown)) {
- const struct lttng_kernel_event_desc *desc =
- &__event_desc___syscall_exit_unknown;
- struct lttng_event *event;
-
- memset(&ev, 0, sizeof(ev));
- strncpy(ev.name, desc->event_name, LTTNG_KERNEL_SYM_NAME_LEN);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
- ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
- event = _lttng_event_create(chan, &ev, filter, desc,
- ev.instrumentation);
- WARN_ON_ONCE(!event);
- if (IS_ERR(event)) {
- return PTR_ERR(event);
- }
- hlist_add_head(&event->u.syscall.node, &chan->sc_exit_unknown);
- }
-
- ret = lttng_create_syscall_event_if_missing(sc_table, ARRAY_SIZE(sc_table),
- chan->sc_table, event_enabler, filter, SC_TYPE_ENTRY);
- if (ret)
- return ret;
- ret = lttng_create_syscall_event_if_missing(sc_exit_table, ARRAY_SIZE(sc_exit_table),
- chan->sc_exit_table, event_enabler, filter, SC_TYPE_EXIT);
- if (ret)
- return ret;
-
-#ifdef CONFIG_COMPAT
- ret = lttng_create_syscall_event_if_missing(compat_sc_table, ARRAY_SIZE(compat_sc_table),
- chan->compat_sc_table, event_enabler, filter,
- SC_TYPE_COMPAT_ENTRY);
- if (ret)
- return ret;
- ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
- chan->compat_sc_exit_table, event_enabler, filter,
- SC_TYPE_COMPAT_EXIT);
- if (ret)
- return ret;
-#endif
-
- if (!chan->sc_filter) {
- chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!chan->sc_filter)
- return -ENOMEM;
- }
-
- if (!chan->sys_enter_registered) {
- ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
- (void *) syscall_entry_event_probe, chan);
- if (ret)
- return ret;
- chan->sys_enter_registered = 1;
- }
- /*
- * We change the name of sys_exit tracepoint due to namespace
- * conflict with sys_exit syscall entry.
- */
- if (!chan->sys_exit_registered) {
- ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
- (void *) syscall_exit_event_probe, chan);
- if (ret) {
- WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_event_probe, chan));
- return ret;
- }
- chan->sys_exit_registered = 1;
- }
- return ret;
-}
-
-/*
- * Should be called with sessions lock held.
- */
-int lttng_syscalls_register_event_notifier(
- struct lttng_event_notifier_enabler *event_notifier_enabler,
- void *filter)
-{
- struct lttng_event_notifier_group *group = event_notifier_enabler->group;
- unsigned int i;
- int ret = 0;
-
- wrapper_vmalloc_sync_mappings();
-
- if (!group->event_notifier_syscall_dispatch) {
- group->event_notifier_syscall_dispatch =
- kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table),
- GFP_KERNEL);
- if (!group->event_notifier_syscall_dispatch)
- return -ENOMEM;
-
- /* Initialize all list_head */
- for (i = 0; i < ARRAY_SIZE(sc_table); i++)
- INIT_HLIST_HEAD(&group->event_notifier_syscall_dispatch[i]);
-
- /* Init the unknown syscall notifier list. */
- INIT_HLIST_HEAD(&group->event_notifier_unknown_syscall_dispatch);
- }
-
- if (!group->event_notifier_exit_syscall_dispatch) {
- group->event_notifier_exit_syscall_dispatch =
- kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(sc_table),
- GFP_KERNEL);
- if (!group->event_notifier_exit_syscall_dispatch)
- return -ENOMEM;
-
- /* Initialize all list_head */
- for (i = 0; i < ARRAY_SIZE(sc_table); i++)
- INIT_HLIST_HEAD(&group->event_notifier_exit_syscall_dispatch[i]);
-
- /* Init the unknown exit syscall notifier list. */
- INIT_HLIST_HEAD(&group->event_notifier_exit_unknown_syscall_dispatch);
- }
-
-#ifdef CONFIG_COMPAT
- if (!group->event_notifier_compat_syscall_dispatch) {
- group->event_notifier_compat_syscall_dispatch =
- kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_table),
- GFP_KERNEL);
- if (!group->event_notifier_syscall_dispatch)
- return -ENOMEM;
-
- /* Initialize all list_head */
- for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++)
- INIT_HLIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]);
-
- /* Init the unknown syscall notifier list. */
- INIT_HLIST_HEAD(&group->event_notifier_compat_unknown_syscall_dispatch);
- }
-
- if (!group->event_notifier_exit_compat_syscall_dispatch) {
- group->event_notifier_exit_compat_syscall_dispatch =
- kzalloc(sizeof(struct hlist_head) * ARRAY_SIZE(compat_sc_exit_table),
- GFP_KERNEL);
- if (!group->event_notifier_exit_syscall_dispatch)
- return -ENOMEM;
-
- /* Initialize all list_head */
- for (i = 0; i < ARRAY_SIZE(compat_sc_exit_table); i++)
- INIT_HLIST_HEAD(&group->event_notifier_exit_compat_syscall_dispatch[i]);
-
- /* Init the unknown exit syscall notifier list. */
- INIT_HLIST_HEAD(&group->event_notifier_exit_compat_unknown_syscall_dispatch);
- }
-#endif
-
- if (!group->sc_filter) {
- group->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!group->sc_filter)
- return -ENOMEM;
- }
-
- if (!group->sys_enter_registered) {
- ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
- (void *) syscall_entry_event_notifier_probe, group);
- if (ret)
- return ret;
- group->sys_enter_registered = 1;
- }
-
- if (!group->sys_exit_registered) {
- ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
- (void *) syscall_exit_event_notifier_probe, group);
- if (ret) {
- WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_event_notifier_probe, group));
- return ret;
- }
- group->sys_exit_registered = 1;
- }
-
- return ret;