mutex_lock(&sessions_mutex);
+ ret = lttng_syscalls_unregister_event_notifier(event_notifier_group);
+ WARN_ON(ret);
+
list_for_each_entry_safe(event_notifier, tmpevent_notifier,
&event_notifier_group->event_notifiers_head, list) {
ret = _lttng_event_notifier_unregister(event_notifier);
irq_work_sync(&event_notifier_group->wakeup_pending);
+ kfree(event_notifier_group->sc_filter);
+
list_for_each_entry_safe(event_notifier_enabler, tmp_event_notifier_enabler,
&event_notifier_group->enablers_head, node)
lttng_event_notifier_enabler_destroy(event_notifier_enabler);
}
switch (event_notifier->instrumentation) {
case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
ret = -EINVAL;
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
WRITE_ONCE(event_notifier->enabled, 1);
break;
- case LTTNG_KERNEL_SYSCALL:
case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_KRETPROBE:
}
switch (event_notifier->instrumentation) {
case LTTNG_KERNEL_TRACEPOINT:
+ case LTTNG_KERNEL_SYSCALL:
ret = -EINVAL;
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
WRITE_ONCE(event_notifier->enabled, 0);
break;
- case LTTNG_KERNEL_SYSCALL:
case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_KRETPROBE:
break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
+ case LTTNG_KERNEL_SYSCALL:
event_name = event_notifier_param->event.name;
break;
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
- case LTTNG_KERNEL_SYSCALL:
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
ret = try_module_get(event_notifier->desc->owner);
WARN_ON_ONCE(!ret);
break;
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ /*
+ * Needs to be explicitly enabled after creation, since
+ * we may want to apply filters.
+ */
+ event_notifier->enabled = 0;
+ event_notifier->registered = 0;
+ event_notifier->desc = event_desc;
+ switch (event_notifier_param->event.u.syscall.entryexit) {
+ case LTTNG_KERNEL_SYSCALL_ENTRYEXIT:
+ ret = -EINVAL;
+ goto register_error;
+ case LTTNG_KERNEL_SYSCALL_ENTRY:
+ event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_ENTRY;
+ break;
+ case LTTNG_KERNEL_SYSCALL_EXIT:
+ event_notifier->u.syscall.entryexit = LTTNG_SYSCALL_EXIT;
+ break;
+ }
+ switch (event_notifier_param->event.u.syscall.abi) {
+ case LTTNG_KERNEL_SYSCALL_ABI_ALL:
+ ret = -EINVAL;
+ goto register_error;
+ case LTTNG_KERNEL_SYSCALL_ABI_NATIVE:
+ event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_NATIVE;
+ break;
+ case LTTNG_KERNEL_SYSCALL_ABI_COMPAT:
+ event_notifier->u.syscall.abi = LTTNG_SYSCALL_ABI_COMPAT;
+ break;
+ }
+
+ if (!event_notifier->desc) {
+ ret = -EINVAL;
+ goto register_error;
+ }
+ break;
case LTTNG_KERNEL_UPROBE:
/*
* Needs to be explicitly enabled after creation, since
break;
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
- case LTTNG_KERNEL_NOOP:
- case LTTNG_KERNEL_SYSCALL:
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
desc->event_notifier_callback,
event_notifier);
break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_enable_event_notifier(event_notifier);
+ break;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
ret = 0;
break;
- case LTTNG_KERNEL_SYSCALL:
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
lttng_uprobes_unregister_event_notifier(event_notifier);
ret = 0;
break;
+ case LTTNG_KERNEL_SYSCALL:
+ ret = lttng_syscall_filter_disable_event_notifier(event_notifier);
+ break;
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
- case LTTNG_KERNEL_SYSCALL:
case LTTNG_KERNEL_NOOP:
default:
WARN_ON_ONCE(1);
module_put(event_notifier->desc->owner);
lttng_kprobes_destroy_event_notifier_private(event_notifier);
break;
+ case LTTNG_KERNEL_NOOP:
+ case LTTNG_KERNEL_SYSCALL:
+ break;
case LTTNG_KERNEL_UPROBE:
module_put(event_notifier->desc->owner);
lttng_uprobes_destroy_event_notifier_private(event_notifier);
break;
case LTTNG_KERNEL_KRETPROBE:
case LTTNG_KERNEL_FUNCTION:
- case LTTNG_KERNEL_NOOP:
- case LTTNG_KERNEL_SYSCALL:
default:
WARN_ON_ONCE(1);
}
return 1;
}
-static
int lttng_desc_match_enabler(const struct lttng_event_desc *desc,
struct lttng_enabler *enabler)
{
WARN_ON_ONCE(ret);
}
+static
+void lttng_create_syscall_event_notifier_if_missing(struct lttng_event_notifier_enabler *event_notifier_enabler)
+{
+ int ret;
+
+ ret = lttng_syscalls_register_event_notifier(event_notifier_enabler, NULL);
+ WARN_ON_ONCE(ret);
+ ret = lttng_syscals_create_matching_event_notifiers(event_notifier_enabler, NULL);
+ WARN_ON_ONCE(ret);
+}
+
/*
* Create struct lttng_event if it is missing and present in the list of
* tracepoint probes.
case LTTNG_KERNEL_TRACEPOINT:
lttng_create_tracepoint_event_notifier_if_missing(event_notifier_enabler);
break;
+ case LTTNG_KERNEL_SYSCALL:
+ lttng_create_syscall_event_notifier_if_missing(event_notifier_enabler);
+ break;
default:
WARN_ON_ONCE(1);
break;
* Create event_notifiers associated with a event_notifier enabler (if not already present).
*/
static
-int lttng_event_notifier_enabler_ref_event_notifiers(struct lttng_event_notifier_enabler *event_notifier_enabler)
+int lttng_event_notifier_enabler_ref_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler)
{
struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group;
+ struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
struct lttng_event_notifier *event_notifier;
+ if (base_enabler->event_param.instrumentation == LTTNG_KERNEL_SYSCALL &&
+ base_enabler->event_param.u.syscall.abi == LTTNG_KERNEL_SYSCALL_ABI_ALL &&
+ base_enabler->event_param.u.syscall.match == LTTNG_KERNEL_SYSCALL_MATCH_NAME &&
+ !strcmp(base_enabler->event_param.name, "*")) {
+
+ int enabled = base_enabler->enabled;
+ enum lttng_kernel_syscall_entryexit entryexit = base_enabler->event_param.u.syscall.entryexit;
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
+ WRITE_ONCE(event_notifier_group->syscall_all_entry, enabled);
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT)
+ WRITE_ONCE(event_notifier_group->syscall_all_exit, enabled);
+
+ }
+
/* First ensure that probe event_notifiers are created for this enabler. */
lttng_create_event_notifier_if_missing(event_notifier_enabler);
event_notifier_enabler->base.format_type = format_type;
INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head);
- memcpy(&event_notifier_enabler->base.event_param.name, event_notifier_param->event.name,
- sizeof(event_notifier_enabler->base.event_param.name));
- event_notifier_enabler->base.event_param.instrumentation = event_notifier_param->event.instrumentation;
+ memcpy(&event_notifier_enabler->base.event_param, &event_notifier_param->event,
+ sizeof(event_notifier_enabler->base.event_param));
event_notifier_enabler->base.evtype = LTTNG_TYPE_ENABLER;
event_notifier_enabler->base.enabled = 0;
#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);
+static
+void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs,
+ long ret);
+
/*
* 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, \
};
static void syscall_entry_event_unknown(struct lttng_event *event,
- struct pt_regs *regs, unsigned int id)
+ struct pt_regs *regs, long id)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
__event_probe__syscall_entry_unknown(event, id, args);
}
+static void syscall_entry_event_notifier_unknown(
+ struct hlist_head *unknown_dispatch_list_head,
+ struct pt_regs *regs, long id)
+{
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_event_notifier *notifier;
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_notifier_probe__compat_syscall_entry_unknown(notifier, id, args);
+ else
+ __event_notifier_probe__syscall_entry_unknown(notifier, id, args);
+ }
+}
+
+static void syscall_exit_event_notifier_unknown(
+ struct hlist_head *unknown_dispatch_list_head,
+ struct pt_regs *regs, long id, long ret)
+{
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_event_notifier *notifier;
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, unknown_dispatch_list_head, u.syscall.node) {
+ if (unlikely(in_compat_syscall()))
+ __event_notifier_probe__compat_syscall_exit_unknown(notifier, id, ret, args);
+ else
+ __event_notifier_probe__syscall_exit_unknown(notifier, id, ret, args);
+ }
+}
+
static __always_inline
void syscall_entry_call_func(void *func, unsigned int nrargs, void *data,
struct pt_regs *regs)
}
}
+static __always_inline
+void syscall_entry_event_notifier_call_func(struct hlist_head *dispatch_list,
+ void *func, unsigned int nrargs, struct pt_regs *regs)
+{
+ struct lttng_event_notifier *notifier;
+
+ switch (nrargs) {
+ case 0:
+ {
+ void (*fptr)(void *__data) = func;
+
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier);
+ break;
+ }
+ case 1:
+ {
+ void (*fptr)(void *__data, unsigned long arg0) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0]);
+ break;
+ }
+ case 2:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1]);
+ break;
+ }
+ case 3:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2]);
+ break;
+ }
+ case 4:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3]);
+ break;
+ }
+ case 5:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3], args[4]);
+ break;
+ }
+ case 6:
+ {
+ void (*fptr)(void *__data,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4,
+ unsigned long arg5) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, args[0], args[1], args[2], args[3], args[4], args[5]);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id)
{
struct lttng_channel *chan = __data;
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 *group = __data;
+ const struct trace_syscall_entry *table, *entry;
+ struct hlist_head *dispatch_list, *unknown_dispatch_list;
+ size_t table_len;
+
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(group->syscall_all_entry) &&
+ !test_bit(id, filter->sc_compat_entry))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = compat_sc_table;
+ table_len = ARRAY_SIZE(compat_sc_table);
+ unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch;
+ } else {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(group->syscall_all_entry) &&
+ !test_bit(id, filter->sc_entry))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = sc_table;
+ table_len = ARRAY_SIZE(sc_table);
+ unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch;
+ }
+ /* Check if the syscall id is out of bound. */
+ if (unlikely(id < 0 || id >= table_len)) {
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
+ return;
+ }
+
+ entry = &table[id];
+ if (!entry->event_notifier_func) {
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
+ return;
+ }
+
+ if (unlikely(in_compat_syscall())) {
+ dispatch_list = &group->event_notifier_compat_syscall_dispatch[id];
+ } else {
+ dispatch_list = &group->event_notifier_syscall_dispatch[id];
+ }
+ if (unlikely(hlist_empty(dispatch_list)))
+ return;
+
+ syscall_entry_event_notifier_call_func(dispatch_list,
+ entry->event_notifier_func, entry->nrargs, regs);
+}
+
static void syscall_exit_event_unknown(struct lttng_event *event,
- struct pt_regs *regs, int id, long ret)
+ struct pt_regs *regs, long id, long ret)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
}
}
+static __always_inline
+void syscall_exit_event_notifier_call_func(struct hlist_head *dispatch_list,
+ void *func, unsigned int nrargs, struct pt_regs *regs, long ret)
+{
+ struct lttng_event_notifier *notifier;
+
+ switch (nrargs) {
+ case 0:
+ {
+ void (*fptr)(void *__data, long ret) = func;
+
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret);
+ break;
+ }
+ case 1:
+ {
+ void (*fptr)(void *__data, long ret, unsigned long arg0) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0]);
+ break;
+ }
+ case 2:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1]);
+ break;
+ }
+ case 3:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2]);
+ break;
+ }
+ case 4:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3]);
+ break;
+ }
+ case 5:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4]);
+ break;
+ }
+ case 6:
+ {
+ void (*fptr)(void *__data,
+ long ret,
+ unsigned long arg0,
+ unsigned long arg1,
+ unsigned long arg2,
+ unsigned long arg3,
+ unsigned long arg4,
+ unsigned long arg5) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+
+ lttng_syscall_get_arguments(current, regs, args);
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret, args[0], args[1], args[2], args[3], args[4], args[5]);
+ break;
+ }
+ default:
+ break;
+ }
+}
+
+static
+void syscall_exit_event_notifier_probe(void *__data, struct pt_regs *regs,
+ long ret)
+{
+ struct lttng_event_notifier_group *group = __data;
+ const struct trace_syscall_entry *table, *entry;
+ struct hlist_head *dispatch_list, *unknown_dispatch_list;
+ size_t table_len;
+ long id;
+
+ id = syscall_get_nr(current, regs);
+
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(group->syscall_all_exit) &&
+ !test_bit(id, filter->sc_compat_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = compat_sc_exit_table;
+ table_len = ARRAY_SIZE(compat_sc_exit_table);
+ unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch;
+ } else {
+ struct lttng_syscall_filter *filter = group->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(group->syscall_all_exit) &&
+ !test_bit(id, filter->sc_exit))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = sc_exit_table;
+ table_len = ARRAY_SIZE(sc_exit_table);
+ unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch;
+ }
+ /* Check if the syscall id is out of bound. */
+ if (unlikely(id < 0 || id >= table_len)) {
+ syscall_exit_event_notifier_unknown(unknown_dispatch_list,
+ regs, id, ret);
+ return;
+ }
+
+ entry = &table[id];
+ if (!entry->event_notifier_func) {
+ syscall_entry_event_notifier_unknown(unknown_dispatch_list,
+ regs, id);
+ return;
+ }
+
+ if (unlikely(in_compat_syscall())) {
+ dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[id];
+ } else {
+ dispatch_list = &group->event_notifier_exit_syscall_dispatch[id];
+ }
+ if (unlikely(hlist_empty(dispatch_list)))
+ return;
+
+ syscall_exit_event_notifier_call_func(dispatch_list,
+ entry->event_notifier_func, entry->nrargs, regs, ret);
+}
/*
* noinline to diminish caller stack size.
* Should be called with sessions lock held.
}
/*
- * Only called at session destruction.
+ * 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;
+}
+
+static
+int create_unknown_event_notifier(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ enum sc_type type)
+{
+ struct lttng_event_notifier *notifier;
+ const struct lttng_event_desc *desc;
+ struct lttng_event_notifier_group *group = event_notifier_enabler->group;
+ struct lttng_kernel_event_notifier event_notifier_param;
+ uint64_t user_token = event_notifier_enabler->base.user_token;
+ struct lttng_enabler *base_enabler = lttng_event_notifier_enabler_as_enabler(
+ event_notifier_enabler);
+ struct hlist_head *unknown_dispatch_list;
+ int ret = 0;
+ bool found = false;
+ enum lttng_kernel_syscall_abi abi;
+ enum lttng_kernel_syscall_entryexit entryexit;
+ struct hlist_head *head;
+
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ desc = &__event_desc___syscall_entry_unknown;
+ unknown_dispatch_list = &group->event_notifier_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ desc = &__event_desc___syscall_exit_unknown;
+ unknown_dispatch_list = &group->event_notifier_exit_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ desc = &__event_desc___compat_syscall_entry_unknown;
+ unknown_dispatch_list = &group->event_notifier_compat_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ desc = &__event_desc___compat_syscall_exit_unknown;
+ unknown_dispatch_list = &group->event_notifier_exit_compat_unknown_syscall_dispatch;
+ entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ default:
+ BUG_ON(1);
+ }
+
+ /*
+ * 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(notifier, head, hlist) {
+ if (notifier->desc == desc &&
+ notifier->user_token == base_enabler->user_token)
+ found = true;
+ }
+ if (found)
+ goto end;
+
+ 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_param.event.u.syscall.abi = abi;
+ event_notifier_param.event.u.syscall.entryexit = entryexit;
+
+ notifier = _lttng_event_notifier_create(desc, user_token,
+ group, &event_notifier_param, NULL,
+ event_notifier_param.event.instrumentation);
+ if (IS_ERR(notifier)) {
+ printk(KERN_INFO "Unable to create unknown notifier %s\n",
+ desc->name);
+ ret = -ENOMEM;
+ goto end;
+ }
+
+ hlist_add_head_rcu(¬ifier->u.syscall.node, unknown_dispatch_list);
+
+end:
+ 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, enum sc_type type)
+{
+ 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));
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ event_notifier_param.event.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ event_notifier_param.event.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ }
+ 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;
+ }
+
+end:
+ return ret;
+
+}
+
+int lttng_syscals_create_matching_event_notifiers(
+ struct lttng_event_notifier_enabler *event_notifier_enabler,
+ void *filter)
+{
+ int ret;
+ struct lttng_enabler *base_enabler =
+ lttng_event_notifier_enabler_as_enabler(event_notifier_enabler);
+ enum lttng_kernel_syscall_entryexit entryexit =
+ base_enabler->event_param.u.syscall.entryexit;
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, sc_table, ARRAY_SIZE(sc_table), SC_TYPE_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, compat_sc_table, ARRAY_SIZE(compat_sc_table),
+ SC_TYPE_COMPAT_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_ENTRY);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_COMPAT_ENTRY);
+ if (ret)
+ goto end;
+ }
+
+ if (entryexit == LTTNG_KERNEL_SYSCALL_EXIT || entryexit == LTTNG_KERNEL_SYSCALL_ENTRYEXIT) {
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, sc_exit_table, ARRAY_SIZE(sc_exit_table),
+ SC_TYPE_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_matching_event_notifiers(event_notifier_enabler,
+ filter, compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+
+ ret = create_unknown_event_notifier(event_notifier_enabler,
+ SC_TYPE_COMPAT_EXIT);
+ if (ret)
+ goto end;
+ }
+
+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;
+ }
+ if (event_notifier_group->sys_exit_registered) {
+ ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
+ (void *) syscall_exit_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);
+ kfree(event_notifier_group->event_notifier_exit_syscall_dispatch);
+#ifdef CONFIG_COMPAT
+ kfree(event_notifier_group->event_notifier_compat_syscall_dispatch);
+ kfree(event_notifier_group->event_notifier_exit_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 *notifier)
+{
+ struct lttng_event_notifier_group *group = notifier->group;
+ unsigned int syscall_id = notifier->u.syscall.syscall_id;
+ struct hlist_head *dispatch_list;
+ int ret = 0;
+
+ WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL);
+
+ ret = lttng_syscall_filter_enable(group->sc_filter,
+ notifier->desc->name, notifier->u.syscall.abi,
+ notifier->u.syscall.entryexit);
+ if (ret) {
+ goto end;
+ }
+
+ switch (notifier->u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (notifier->u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &group->event_notifier_syscall_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &group->event_notifier_compat_syscall_dispatch[syscall_id];
+ break;
+ }
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (notifier->u.syscall.abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ dispatch_list = &group->event_notifier_exit_syscall_dispatch[syscall_id];
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ dispatch_list = &group->event_notifier_exit_compat_syscall_dispatch[syscall_id];
+ break;
+ }
+ break;
+ }
+
+ hlist_add_head_rcu(¬ifier->u.syscall.node, dispatch_list);
+
+end:
+ return ret ;
+}
+
int lttng_syscall_filter_enable_event(
struct lttng_channel *channel,
struct lttng_event *event)
return 0;
}
+int lttng_syscall_filter_disable_event_notifier(
+ struct lttng_event_notifier *notifier)
+{
+ struct lttng_event_notifier_group *group = notifier->group;
+ int ret;
+
+ WARN_ON_ONCE(notifier->instrumentation != LTTNG_KERNEL_SYSCALL);
+
+ ret = lttng_syscall_filter_disable(group->sc_filter,
+ notifier->desc->name, notifier->u.syscall.abi,
+ notifier->u.syscall.entryexit);
+ WARN_ON_ONCE(ret != 0);
+
+ hlist_del_rcu(¬ifier->u.syscall.node);
+ return 0;
+}
+
int lttng_syscall_filter_disable_event(
struct lttng_channel *channel,
struct lttng_event *event)
projects / lttng-modules.git / commitdiff
