X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Flttng-syscalls.c;h=316055f2370cff7a8f9ff591627b2a70af644c3c;hb=1ab4126a90a19f9a50935cbcebd1ce9020f3df3b;hp=2a9125a257595eed4dfab2a27388cc52d5724300;hpb=ac07db609af1b9889ec7a3ef0b9ecb5bb8dcb9f5;p=lttng-modules.git diff --git a/src/lttng-syscalls.c b/src/lttng-syscalls.c index 2a9125a2..316055f2 100644 --- a/src/lttng-syscalls.c +++ b/src/lttng-syscalls.c @@ -636,46 +636,121 @@ void lttng_syscall_event_enabler_create_event(struct lttng_event_enabler_common } } -/* - * noinline to diminish caller stack size. - * Should be called with sessions lock held. - */ static -int lttng_create_syscall_event_if_missing(const struct trace_syscall_entry *table, size_t table_len, - struct hlist_head *dispatch_table, struct lttng_event_recorder_enabler *syscall_event_enabler, - enum sc_type type) +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) { - struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&syscall_event_enabler->parent); + 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; - /* Allocate events for each syscall matching enabler, insert into table */ + if (!IS_ENABLED(CONFIG_COMPAT) && (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT)) + return; + + /* iterate over all syscall and create event_notifier that match */ for (i = 0; i < table_len; i++) { - const struct lttng_kernel_event_desc *desc = table[i].desc; struct lttng_kernel_event_common_private *event_priv; struct hlist_head *head; - bool found = false; + int found = 0; + desc = table[i].desc; if (!desc) { /* Unknown syscall */ continue; } - if (!lttng_desc_match_enabler(desc, - lttng_event_recorder_enabler_as_enabler(syscall_event_enabler))) + + if (!lttng_desc_match_enabler(desc, syscall_event_enabler_common)) continue; + /* * Check if already created. */ 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->parent, desc, event_priv->pub)) - found = true; + if (lttng_event_enabler_desc_match_event(syscall_event_enabler_common, desc, event_priv->pub)) + found = 1; } if (found) continue; - lttng_syscall_event_enabler_create_event(&syscall_event_enabler->parent, desc, dispatch_table, type, i); + lttng_syscall_event_enabler_create_event(syscall_event_enabler_common, desc, dispatch_table, type, i); } - return 0; +} + +static +bool lttng_syscall_event_enabler_is_wildcard_all(struct lttng_event_enabler_common *event_enabler) +{ + if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) + return false; + if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) + return false; + if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) + return false; + if (strcmp(event_enabler->event_param.name, "*")) + return false; + return true; +} + +static +void create_unknown_syscall_event(struct lttng_event_enabler_common *event_enabler, enum sc_type type) +{ + struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(event_enabler); + struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(event_enabler); + struct lttng_kernel_event_common_private *event_priv; + const struct lttng_kernel_event_desc *desc; + struct hlist_head *unknown_dispatch_list; + bool found = false; + struct hlist_head *head; + + if (!IS_ENABLED(CONFIG_COMPAT) && (type == SC_TYPE_COMPAT_ENTRY || type == SC_TYPE_COMPAT_EXIT)) + return; + + /* + * Considering that currently system calls can only be enabled on a per + * name basis (or wildcard based on a name), unknown syscall events are + * only used when matching *all* system calls, because this is the only + * case which can be associated with an unknown system call. + * + * When enabling system call on a per system call number basis will be + * supported, this will need to be revisited. + */ + if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) + return; + + switch (type) { + case SC_TYPE_ENTRY: + desc = &__event_desc___syscall_entry_unknown; + unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; + break; + case SC_TYPE_EXIT: + desc = &__event_desc___syscall_exit_unknown; + unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; + break; + case SC_TYPE_COMPAT_ENTRY: + desc = &__event_desc___compat_syscall_entry_unknown; + unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; + break; + case SC_TYPE_COMPAT_EXIT: + desc = &__event_desc___compat_syscall_exit_unknown; + unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; + break; + default: + WARN_ON_ONCE(1); + } + + /* + * Check if already created. + */ + 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)) + found = true; + } + if (!found) + lttng_syscall_event_enabler_create_event(event_enabler, desc, unknown_dispatch_list, type, -1U); } static @@ -684,7 +759,6 @@ int lttng_syscalls_populate_events(struct lttng_event_enabler_common *syscall_ev struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(syscall_event_enabler); struct lttng_event_recorder_enabler *event_recorder_enabler; struct lttng_kernel_channel_buffer *chan; - struct lttng_kernel_abi_event ev; int ret; if (syscall_event_enabler->enabler_type != LTTNG_EVENT_ENABLER_TYPE_RECORDER) @@ -692,125 +766,20 @@ int lttng_syscalls_populate_events(struct lttng_event_enabler_common *syscall_ev event_recorder_enabler = container_of(syscall_event_enabler, struct lttng_event_recorder_enabler, parent); chan = event_recorder_enabler->chan; - if (hlist_empty(&syscall_table->unknown_syscall_dispatch)) { - const struct lttng_kernel_event_desc *desc = - &__event_desc___syscall_entry_unknown; - struct lttng_kernel_event_common *event; - struct lttng_event_recorder_enabler *event_enabler; - - memset(&ev, 0, sizeof(ev)); - strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); - ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; - ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; - ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; - ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; - event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); - if (!event_enabler) { - return -ENOMEM; - } - event = _lttng_kernel_event_create(&event_enabler->parent, desc); - lttng_event_enabler_destroy(&event_enabler->parent); - WARN_ON_ONCE(!event); - if (IS_ERR(event)) { - return PTR_ERR(event); - } - hlist_add_head(&event->priv->u.syscall.node, &syscall_table->unknown_syscall_dispatch); - } - - if (hlist_empty(&syscall_table->compat_unknown_syscall_dispatch)) { - const struct lttng_kernel_event_desc *desc = - &__event_desc___compat_syscall_entry_unknown; - struct lttng_kernel_event_common *event; - struct lttng_event_recorder_enabler *event_enabler; - - memset(&ev, 0, sizeof(ev)); - strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); - ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; - ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; - ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_ENTRY; - ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; - event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); - if (!event_enabler) { - return -ENOMEM; - } - event = _lttng_kernel_event_create(&event_enabler->parent, desc); - WARN_ON_ONCE(!event); - lttng_event_enabler_destroy(&event_enabler->parent); - if (IS_ERR(event)) { - return PTR_ERR(event); - } - hlist_add_head(&event->priv->u.syscall.node, &syscall_table->compat_unknown_syscall_dispatch); - } - - if (hlist_empty(&syscall_table->compat_unknown_syscall_exit_dispatch)) { - const struct lttng_kernel_event_desc *desc = - &__event_desc___compat_syscall_exit_unknown; - struct lttng_kernel_event_common *event; - struct lttng_event_recorder_enabler *event_enabler; - - memset(&ev, 0, sizeof(ev)); - strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); - ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; - ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; - ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; - ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_COMPAT; - event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); - if (!event_enabler) { - return -ENOMEM; - } - event = _lttng_kernel_event_create(&event_enabler->parent, desc); - WARN_ON_ONCE(!event); - lttng_event_enabler_destroy(&event_enabler->parent); - if (IS_ERR(event)) { - return PTR_ERR(event); - } - hlist_add_head(&event->priv->u.syscall.node, &syscall_table->compat_unknown_syscall_exit_dispatch); - } - - if (hlist_empty(&syscall_table->unknown_syscall_exit_dispatch)) { - const struct lttng_kernel_event_desc *desc = - &__event_desc___syscall_exit_unknown; - struct lttng_kernel_event_common *event; - struct lttng_event_recorder_enabler *event_enabler; - - memset(&ev, 0, sizeof(ev)); - strncpy(ev.name, desc->event_name, LTTNG_KERNEL_ABI_SYM_NAME_LEN); - ev.name[LTTNG_KERNEL_ABI_SYM_NAME_LEN - 1] = '\0'; - ev.instrumentation = LTTNG_KERNEL_ABI_SYSCALL; - ev.u.syscall.entryexit = LTTNG_KERNEL_ABI_SYSCALL_EXIT; - ev.u.syscall.abi = LTTNG_KERNEL_ABI_SYSCALL_ABI_NATIVE; - event_enabler = lttng_event_recorder_enabler_create(LTTNG_ENABLER_FORMAT_NAME, &ev, chan); - if (!event_enabler) { - return -ENOMEM; - } - event = _lttng_kernel_event_create(&event_enabler->parent, desc); - WARN_ON_ONCE(!event); - lttng_event_enabler_destroy(&event_enabler->parent); - if (IS_ERR(event)) { - return PTR_ERR(event); - } - hlist_add_head(&event->priv->u.syscall.node, &syscall_table->unknown_syscall_exit_dispatch); - } + lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, sc_table.table, sc_table.len, + syscall_table->syscall_dispatch, SC_TYPE_ENTRY); + lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, sc_exit_table.table, sc_exit_table.len, + syscall_table->syscall_exit_dispatch, SC_TYPE_EXIT); + create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_ENTRY); + create_unknown_syscall_event(syscall_event_enabler, SC_TYPE_EXIT); - ret = lttng_create_syscall_event_if_missing(sc_table.table, sc_table.len, - syscall_table->syscall_dispatch, event_recorder_enabler, SC_TYPE_ENTRY); - if (ret) - return ret; - ret = lttng_create_syscall_event_if_missing(sc_exit_table.table, sc_exit_table.len, - syscall_table->syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_EXIT); - if (ret) - return ret; + lttng_syscall_event_enabler_create_matching_events(&event_recorder_enabler->parent, compat_sc_table.table, compat_sc_table.len, + syscall_table->compat_syscall_dispatch, 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, + syscall_table->compat_syscall_exit_dispatch, 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); -#ifdef CONFIG_COMPAT - ret = lttng_create_syscall_event_if_missing(compat_sc_table.table, compat_sc_table.len, - syscall_table->compat_syscall_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_ENTRY); - if (ret) - return ret; - ret = lttng_create_syscall_event_if_missing(compat_sc_exit_table.table, compat_sc_exit_table.len, - syscall_table->compat_syscall_exit_dispatch, event_recorder_enabler, SC_TYPE_COMPAT_EXIT); - if (ret) - return ret; -#endif return ret; } @@ -835,7 +804,6 @@ int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enab return -ENOMEM; } - #ifdef CONFIG_COMPAT if (!syscall_table->compat_syscall_dispatch) { /* create syscall table mapping compat syscall to events */ @@ -887,93 +855,6 @@ int lttng_event_enabler_create_syscall_events_if_missing(struct lttng_event_enab return ret; } -static -void create_unknown_event_notifier( - struct lttng_event_notifier_enabler *event_notifier_enabler, - enum sc_type type) -{ - struct lttng_kernel_syscall_table *syscall_table = get_syscall_table_from_enabler(&event_notifier_enabler->parent); - struct lttng_event_ht *events_ht = lttng_get_event_ht_from_enabler(&event_notifier_enabler->parent); - struct lttng_kernel_event_common_private *event_priv; - const struct lttng_kernel_event_desc *desc; - struct hlist_head *unknown_dispatch_list; - bool found = false; - struct hlist_head *head; - - switch (type) { - case SC_TYPE_ENTRY: - desc = &__event_desc___syscall_entry_unknown; - unknown_dispatch_list = &syscall_table->unknown_syscall_dispatch; - break; - case SC_TYPE_EXIT: - desc = &__event_desc___syscall_exit_unknown; - unknown_dispatch_list = &syscall_table->unknown_syscall_exit_dispatch; - break; - case SC_TYPE_COMPAT_ENTRY: - desc = &__event_desc___compat_syscall_entry_unknown; - unknown_dispatch_list = &syscall_table->compat_unknown_syscall_dispatch; - break; - case SC_TYPE_COMPAT_EXIT: - desc = &__event_desc___compat_syscall_exit_unknown; - unknown_dispatch_list = &syscall_table->compat_unknown_syscall_exit_dispatch; - break; - default: - WARN_ON_ONCE(1); - } - - /* - * Check if already created. - */ - 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_notifier_enabler->parent, desc, event_priv->pub)) - found = true; - } - if (!found) - lttng_syscall_event_enabler_create_event(&event_notifier_enabler->parent, desc, unknown_dispatch_list, type, -1U); -} - -static -void create_matching_event_notifiers( - struct lttng_event_notifier_enabler *syscall_event_notifier_enabler, - 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_notifier_enabler->parent); - const struct lttng_kernel_event_desc *desc; - unsigned int i; - - /* iterate over all syscall and create event_notifier that match */ - for (i = 0; i < table_len; i++) { - struct lttng_kernel_event_common_private *event_priv; - 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(syscall_event_notifier_enabler))) - continue; - - /* - * Check if already created. - */ - 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_notifier_enabler->parent, desc, event_priv->pub)) - found = 1; - } - if (found) - continue; - - lttng_syscall_event_enabler_create_event(&syscall_event_notifier_enabler->parent, desc, NULL, type, i); - } -} - static int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_common *event_enabler) { @@ -987,24 +868,21 @@ int lttng_syscalls_create_matching_event_notifiers(struct lttng_event_enabler_co event_notifier_enabler = container_of(event_enabler, struct lttng_event_notifier_enabler, parent); if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) { - create_matching_event_notifiers(event_notifier_enabler, - sc_table.table, sc_table.len, SC_TYPE_ENTRY); - create_matching_event_notifiers(event_notifier_enabler, - compat_sc_table.table, compat_sc_table.len, - SC_TYPE_COMPAT_ENTRY); - create_unknown_event_notifier(event_notifier_enabler, SC_TYPE_ENTRY); - create_unknown_event_notifier(event_notifier_enabler, SC_TYPE_COMPAT_ENTRY); + 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) { - create_matching_event_notifiers(event_notifier_enabler, - sc_exit_table.table, sc_exit_table.len, - SC_TYPE_EXIT); - create_matching_event_notifiers(event_notifier_enabler, - compat_sc_exit_table.table, compat_sc_exit_table.len, - SC_TYPE_COMPAT_EXIT); - create_unknown_event_notifier(event_notifier_enabler, SC_TYPE_EXIT); - create_unknown_event_notifier(event_notifier_enabler, SC_TYPE_COMPAT_EXIT); + 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; } @@ -1344,15 +1222,8 @@ void lttng_syscall_table_set_wildcard_all(struct lttng_event_enabler_common *eve enum lttng_kernel_abi_syscall_entryexit entryexit; int enabled = event_enabler->enabled; - if (event_enabler->event_param.instrumentation != LTTNG_KERNEL_ABI_SYSCALL) - return; - if (event_enabler->event_param.u.syscall.abi != LTTNG_KERNEL_ABI_SYSCALL_ABI_ALL) - return; - if (event_enabler->event_param.u.syscall.match != LTTNG_KERNEL_ABI_SYSCALL_MATCH_NAME) + if (!lttng_syscall_event_enabler_is_wildcard_all(event_enabler)) return; - if (strcmp(event_enabler->event_param.name, "*")) - return; - entryexit = event_enabler->event_param.u.syscall.entryexit; if (entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRY || entryexit == LTTNG_KERNEL_ABI_SYSCALL_ENTRYEXIT) WRITE_ONCE(syscall_table->syscall_all_entry, enabled);