#include <wrapper/rcu.h>
#include <wrapper/syscall.h>
#include <lttng/events.h>
-#include <lttng/utils.h>
#ifndef CONFIG_COMPAT
# ifndef is_compat_task
static
void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret);
-static
-void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs,
- long id);
-
/*
* Forward declarations for old kernels.
*/
struct trace_syscall_entry {
void *event_func;
- void *event_notifier_func;
const struct lttng_event_desc *desc;
const struct lttng_event_field *fields;
unsigned int nrargs;
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
.event_func = __event_probe__syscall_entry_##_template, \
- .event_notifier_func = __event_notifier_probe__syscall_entry_##_template, \
.nrargs = (_nrargs), \
.fields = __event_fields___syscall_entry_##_template, \
.desc = &__event_desc___syscall_entry_##_name, \
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
.event_func = __event_probe__compat_syscall_entry_##_template, \
- .event_notifier_func = __event_notifier_probe__compat_syscall_entry_##_template, \
.nrargs = (_nrargs), \
.fields = __event_fields___compat_syscall_entry_##_template, \
.desc = &__event_desc___compat_syscall_entry_##_name, \
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
.event_func = __event_probe__syscall_exit_##_template, \
- .event_notifier_func = __event_notifier_probe__syscall_exit_##_template, \
.nrargs = (_nrargs), \
.fields = __event_fields___syscall_exit_##_template, \
.desc = &__event_desc___syscall_exit_##_name, \
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
.event_func = __event_probe__compat_syscall_exit_##_template, \
- .event_notifier_func = __event_notifier_probe__compat_syscall_exit_##_template, \
.nrargs = (_nrargs), \
.fields = __event_fields___compat_syscall_exit_##_template, \
.desc = &__event_desc___compat_syscall_exit_##_name, \
__event_probe__syscall_entry_unknown(event, id, args);
}
-static void syscall_entry_event_notifier_unknown(
- struct lttng_event_notifier_group *notifier_group,
- struct pt_regs *regs, unsigned int id)
-{
- unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- struct lttng_event *event;
-
- lttng_syscall_get_arguments(current, regs, args);
- if (unlikely(in_compat_syscall()))
- __event_probe__compat_syscall_notifier_entry_unknown(event, id, args);
- else
- __event_probe__syscall_notifier_entry_unknown(event, id, args);
-}
-
static __always_inline
void syscall_entry_call_func(void *func, unsigned int nrargs, void *data,
struct pt_regs *regs)
syscall_entry_call_func(entry->event_func, entry->nrargs, event, regs);
}
-void syscall_entry_event_notifier_probe(void *__data, struct pt_regs *regs, long id)
-{
- struct lttng_event_notifier_group *event_notifier_group = __data;
- const struct trace_syscall_entry *entry;
- struct list_head *dispatch_list;
- struct lttng_event_notifier *iter;
- size_t table_len;
-
- if (unlikely(in_compat_syscall())) {
- table_len = ARRAY_SIZE(compat_sc_table);
- if (unlikely(id < 0 || id >= table_len)) {
- return;
- }
- entry = &compat_sc_table[id];
- dispatch_list = &event_notifier_group->event_notifier_compat_syscall_dispatch[id];
- } else {
- table_len = ARRAY_SIZE(sc_table);
- if (unlikely(id < 0 || id >= table_len)) {
- return;
- }
- entry = &sc_table[id];
- dispatch_list = &event_notifier_group->event_notifier_syscall_dispatch[id];
- }
-
- if (unlikely(id < 0 || id >= table_len)) {
- syscall_entry_event_notifier_unknown(event_notifier_group, regs, id);
- return;
- }
-
- /* TODO handle unknown syscall */
-
- list_for_each_entry_rcu(iter, dispatch_list, u.syscall.node) {
- BUG_ON(iter->u.syscall.syscall_id != id);
- syscall_entry_call_func(entry->event_notifier_func,
- entry->nrargs, iter, regs);
- }
-}
-
static void syscall_exit_event_unknown(struct lttng_event *event,
struct pt_regs *regs, int id, long ret)
{
}
/*
- * Should be called with sessions lock held.
+ * Only called at session destruction.
*/
-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 list_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_LIST_HEAD(&group->event_notifier_syscall_dispatch[i]);
- }
-
-#ifdef CONFIG_COMPAT
- if (!group->event_notifier_compat_syscall_dispatch) {
- group->event_notifier_compat_syscall_dispatch = kzalloc(sizeof(struct list_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_LIST_HEAD(&group->event_notifier_compat_syscall_dispatch[i]);
- }
-#endif
-
- 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;
- }
-
- return ret;
-}
-
-static int create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler,
- void *filter, const struct trace_syscall_entry *table,
- size_t table_len, bool is_compat)
-{
- struct lttng_event_notifier_group *group = event_notifier_enabler->group;
- const struct lttng_event_desc *desc;
- uint64_t user_token = event_notifier_enabler->base.user_token;
- unsigned int i;
- int ret = 0;
-
- /* iterate over all syscall and create event_notifier that match */
- for (i = 0; i < table_len; i++) {
- struct lttng_event_notifier *event_notifier;
- struct lttng_kernel_event_notifier event_notifier_param;
- struct hlist_head *head;
- int found = 0;
-
- desc = table[i].desc;
- if (!desc) {
- /* Unknown syscall */
- continue;
- }
-
- if (!lttng_desc_match_enabler(desc,
- lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)))
- continue;
-
- /*
- * Check if already created.
- */
- head = utils_borrow_hash_table_bucket(group->event_notifiers_ht.table,
- LTTNG_EVENT_NOTIFIER_HT_SIZE, desc->name);
- lttng_hlist_for_each_entry(event_notifier, head, hlist) {
- if (event_notifier->desc == desc
- && event_notifier->user_token == event_notifier_enabler->base.user_token)
- found = 1;
- }
- if (found)
- continue;
-
- memset(&event_notifier_param, 0, sizeof(event_notifier_param));
- strncat(event_notifier_param.event.name, desc->name,
- LTTNG_KERNEL_SYM_NAME_LEN - strlen(event_notifier_param.event.name) - 1);
- event_notifier_param.event.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- event_notifier_param.event.instrumentation = LTTNG_KERNEL_SYSCALL;
-
- event_notifier = _lttng_event_notifier_create(desc, user_token, group,
- &event_notifier_param, filter,
- event_notifier_param.event.instrumentation);
- if (IS_ERR(event_notifier)) {
- printk(KERN_INFO "Unable to create event_notifier %s\n",
- desc->name);
- ret = -ENOMEM;
- goto end;
- }
-
- event_notifier->u.syscall.syscall_id = i;
- event_notifier->u.syscall.is_compat = is_compat;
- }
-end:
- return ret;
-
-}
-
-int lttng_syscals_create_matching_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler, void *filter)
-{
- int ret;
-
- ret = create_matching_event_notifiers(event_notifier_enabler, filter, sc_table,
- ARRAY_SIZE(sc_table), false);
- if (ret)
- goto end;
-
- ret = create_matching_event_notifiers(event_notifier_enabler, filter, compat_sc_table,
- ARRAY_SIZE(compat_sc_table), true);
-end:
- return ret;
-}
-
-/*
- * Unregister the syscall event_notifier probes from the callsites.
- */
-int lttng_syscalls_unregister_event_notifier(struct lttng_event_notifier_group *event_notifier_group)
-{
- int ret;
-
- /*
- * Only register the event_notifier probe on the `sys_enter` callsite for now.
- * At the moment, we don't think it's desirable to have one fired
- * event_notifier for the entry and one for the exit of a syscall.
- */
- if (event_notifier_group->sys_enter_registered) {
- ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_event_notifier_probe, event_notifier_group);
- if (ret)
- return ret;
- event_notifier_group->sys_enter_registered = 0;
- }
-
- kfree(event_notifier_group->event_notifier_syscall_dispatch);
-#ifdef CONFIG_COMPAT
- kfree(event_notifier_group->event_notifier_compat_syscall_dispatch);
-#endif
- return 0;
-}
-
int lttng_syscalls_unregister_event(struct lttng_channel *chan)
{
int ret;
return 0;
}
-int lttng_syscall_filter_enable_event_notifier(
- struct lttng_event_notifier *event_notifier)
-{
- struct lttng_event_notifier_group *group = event_notifier->group;
- unsigned int syscall_id = event_notifier->u.syscall.syscall_id;
- struct list_head *dispatch_list;
-
- if (event_notifier->u.syscall.is_compat)
- dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id];
- else
- dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id];
-
- list_add_rcu(&event_notifier->u.syscall.node, dispatch_list);
-
- return 0;
-}
-
int lttng_syscall_filter_disable_event(struct lttng_channel *chan,
struct lttng_event *event)
{
return 0;
}
-int lttng_syscall_filter_disable_event_notifier(
- struct lttng_event_notifier *event_notifier)
-{
- list_del_rcu(&event_notifier->u.syscall.node);
- return 0;
-}
-
static
const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos)
{
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