X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=src%2Flttng-syscalls.c;h=1465083556c4ca94657deb621cdb95f58b297962;hb=8a8ac9a87ae1ddffad34d96a66be224e8c8d89e4;hp=3139a556822e543fcca852a40d96c968c34062d8;hpb=63aa91609c6b8140e5382ecc0f94dc555b62af7b;p=lttng-modules.git diff --git a/src/lttng-syscalls.c b/src/lttng-syscalls.c index 3139a556..14650835 100644 --- a/src/lttng-syscalls.c +++ b/src/lttng-syscalls.c @@ -29,6 +29,7 @@ #include #include #include +#include #ifndef CONFIG_COMPAT # ifndef is_compat_task @@ -63,6 +64,13 @@ void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id); 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. */ @@ -285,6 +293,7 @@ typedef __kernel_old_time_t time_t; 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; @@ -301,6 +310,7 @@ struct trace_syscall_entry { #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, \ @@ -316,6 +326,7 @@ static const struct trace_syscall_entry sc_table[] = { #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, \ @@ -338,6 +349,7 @@ const struct trace_syscall_entry compat_sc_table[] = { #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, \ @@ -353,6 +365,7 @@ static const struct trace_syscall_entry sc_exit_table[] = { #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, \ @@ -376,7 +389,7 @@ struct lttng_syscall_filter { }; 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]; @@ -387,6 +400,38 @@ static void syscall_entry_event_unknown(struct lttng_event *event, __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) @@ -479,6 +524,106 @@ void syscall_entry_call_func(void *func, unsigned int nrargs, void *data, } } +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; @@ -522,12 +667,71 @@ void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id) return; } entry = &table[id]; - WARN_ON_ONCE(!entry); + WARN_ON_ONCE(!entry->event_func); 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]; @@ -584,7 +788,7 @@ void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) return; } entry = &table[id]; - WARN_ON_ONCE(!entry); + WARN_ON_ONCE(!entry->event_func); switch (entry->nrargs) { case 0: @@ -681,6 +885,173 @@ void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret) } } +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. @@ -918,8 +1289,377 @@ int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter) } /* - * 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; @@ -1008,15 +1748,16 @@ uint32_t get_sc_tables_len(void) } static -const char *get_syscall_name(struct lttng_event *event) +const char *get_syscall_name(const char *desc_name, + enum lttng_syscall_abi abi, + enum lttng_syscall_entryexit entryexit) { size_t prefix_len = 0; - WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); - switch (event->u.syscall.entryexit) { + switch (entryexit) { case LTTNG_SYSCALL_ENTRY: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: prefix_len = strlen(SYSCALL_ENTRY_STR); break; @@ -1026,7 +1767,7 @@ const char *get_syscall_name(struct lttng_event *event) } break; case LTTNG_SYSCALL_EXIT: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: prefix_len = strlen(SYSCALL_EXIT_STR); break; @@ -1037,22 +1778,22 @@ const char *get_syscall_name(struct lttng_event *event) break; } WARN_ON_ONCE(prefix_len == 0); - return event->desc->name + prefix_len; + return desc_name + prefix_len; } -int lttng_syscall_filter_enable_event(struct lttng_channel *chan, - struct lttng_event *event) +static +int lttng_syscall_filter_enable( + struct lttng_syscall_filter *filter, + const char *desc_name, enum lttng_syscall_abi abi, + enum lttng_syscall_entryexit entryexit) { - struct lttng_syscall_filter *filter = chan->sc_filter; const char *syscall_name; unsigned long *bitmap; int syscall_nr; - WARN_ON_ONCE(!chan->sc_table); + syscall_name = get_syscall_name(desc_name, abi, entryexit); - syscall_name = get_syscall_name(event); - - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: syscall_nr = get_syscall_nr(syscall_name); break; @@ -1065,9 +1806,9 @@ int lttng_syscall_filter_enable_event(struct lttng_channel *chan, if (syscall_nr < 0) return -ENOENT; - switch (event->u.syscall.entryexit) { + switch (entryexit) { case LTTNG_SYSCALL_ENTRY: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: bitmap = filter->sc_entry; break; @@ -1079,7 +1820,7 @@ int lttng_syscall_filter_enable_event(struct lttng_channel *chan, } break; case LTTNG_SYSCALL_EXIT: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: bitmap = filter->sc_exit; break; @@ -1099,19 +1840,76 @@ int lttng_syscall_filter_enable_event(struct lttng_channel *chan, return 0; } -int lttng_syscall_filter_disable_event(struct lttng_channel *chan, +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) { - struct lttng_syscall_filter *filter = chan->sc_filter; + WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL); + + return lttng_syscall_filter_enable(channel->sc_filter, + event->desc->name, event->u.syscall.abi, + event->u.syscall.entryexit); +} + +static +int lttng_syscall_filter_disable( + struct lttng_syscall_filter *filter, + const char *desc_name, enum lttng_syscall_abi abi, + enum lttng_syscall_entryexit entryexit) +{ const char *syscall_name; unsigned long *bitmap; int syscall_nr; - WARN_ON_ONCE(!chan->sc_table); - - syscall_name = get_syscall_name(event); + syscall_name = get_syscall_name(desc_name, abi, entryexit); - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: syscall_nr = get_syscall_nr(syscall_name); break; @@ -1124,9 +1922,9 @@ int lttng_syscall_filter_disable_event(struct lttng_channel *chan, if (syscall_nr < 0) return -ENOENT; - switch (event->u.syscall.entryexit) { + switch (entryexit) { case LTTNG_SYSCALL_ENTRY: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: bitmap = filter->sc_entry; break; @@ -1138,7 +1936,7 @@ int lttng_syscall_filter_disable_event(struct lttng_channel *chan, } break; case LTTNG_SYSCALL_EXIT: - switch (event->u.syscall.abi) { + switch (abi) { case LTTNG_SYSCALL_ABI_NATIVE: bitmap = filter->sc_exit; break; @@ -1159,6 +1957,32 @@ int lttng_syscall_filter_disable_event(struct lttng_channel *chan, 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) +{ + return lttng_syscall_filter_disable(channel->sc_filter, + event->desc->name, event->u.syscall.abi, + event->u.syscall.entryexit); +} + static const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) {