#include <wrapper/rcu.h>
#include <wrapper/syscall.h>
#include <lttng/events.h>
+#include <lttng/utils.h>
#ifndef CONFIG_COMPAT
# ifndef is_compat_task
#define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
static
-void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
+void syscall_entry_event_probe(void *__data, struct pt_regs *regs, long id);
static
-void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret);
+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.
/* Hijack probe callback for system call enter */
#undef TP_PROBE_CB
-#define TP_PROBE_CB(_template) &syscall_entry_probe
+#define TP_PROBE_CB(_template) &syscall_entry_event_probe
#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
PARAMS(_fields))
#undef _TRACE_SYSCALLS_POINTERS_H
/* Hijack probe callback for compat system call enter */
-#define TP_PROBE_CB(_template) &syscall_entry_probe
+#define TP_PROBE_CB(_template) &syscall_entry_event_probe
#define LTTNG_SC_COMPAT
#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
#define sc_inout(...) __VA_ARGS__
/* Hijack probe callback for system call exit */
-#define TP_PROBE_CB(_template) &syscall_exit_probe
+#define TP_PROBE_CB(_template) &syscall_exit_event_probe
#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
PARAMS(_fields))
/* Hijack probe callback for compat system call exit */
-#define TP_PROBE_CB(_template) &syscall_exit_probe
+#define TP_PROBE_CB(_template) &syscall_exit_event_probe
#define LTTNG_SC_COMPAT
#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
#undef CREATE_TRACE_POINTS
struct trace_syscall_entry {
- void *func;
+ void *event_func;
+ void *event_notifier_func;
const struct lttng_event_desc *desc;
const struct lttng_event_field *fields;
unsigned int nrargs;
#undef TRACE_SYSCALL_TABLE
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
- .func = __event_probe__syscall_entry_##_template, \
+ .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, \
},
-/* Syscall enter tracing table */
+/* Event syscall enter tracing table */
static const struct trace_syscall_entry sc_table[] = {
#include <instrumentation/syscalls/headers/syscalls_integers.h>
#include <instrumentation/syscalls/headers/syscalls_pointers.h>
#undef TRACE_SYSCALL_TABLE
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
- .func = __event_probe__compat_syscall_entry_##_template, \
+ .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, \
},
-/* Compat syscall enter table */
+/* Event compat syscall enter table */
const struct trace_syscall_entry compat_sc_table[] = {
#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
#undef TRACE_SYSCALL_TABLE
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
- .func = __event_probe__syscall_exit_##_template, \
+ .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, \
},
-/* Syscall exit table */
+/* Event syscall exit table */
static const struct trace_syscall_entry sc_exit_table[] = {
#include <instrumentation/syscalls/headers/syscalls_integers.h>
#include <instrumentation/syscalls/headers/syscalls_pointers.h>
#undef TRACE_SYSCALL_TABLE
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
- .func = __event_probe__compat_syscall_exit_##_template, \
+ .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, \
},
-/* Compat syscall exit table */
+/* Event compat syscall exit table */
const struct trace_syscall_entry compat_sc_exit_table[] = {
#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
#undef CREATE_SYSCALL_TABLE
struct lttng_syscall_filter {
- DECLARE_BITMAP(sc, NR_syscalls);
- DECLARE_BITMAP(sc_compat, NR_compat_syscalls);
+ DECLARE_BITMAP(sc_entry, NR_syscalls);
+ DECLARE_BITMAP(sc_exit, NR_syscalls);
+ DECLARE_BITMAP(sc_compat_entry, NR_compat_syscalls);
+ DECLARE_BITMAP(sc_compat_exit, NR_compat_syscalls);
};
-static void syscall_entry_unknown(struct lttng_event *event,
- struct pt_regs *regs, unsigned int id)
+static void syscall_entry_event_unknown(struct lttng_event *event,
+ struct pt_regs *regs, long id)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
__event_probe__syscall_entry_unknown(event, id, args);
}
-void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
+static void syscall_entry_event_notifier_unknown(
+ struct hlist_head *unknown_dispatch_list_head,
+ struct pt_regs *regs, long id)
{
- struct lttng_channel *chan = __data;
- struct lttng_event *event, *unknown_event;
- const struct trace_syscall_entry *table, *entry;
- size_t table_len;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
+ struct lttng_event_notifier *notifier;
- if (unlikely(in_compat_syscall())) {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
- }
- table = compat_sc_table;
- table_len = ARRAY_SIZE(compat_sc_table);
- unknown_event = chan->sc_compat_unknown;
- } else {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_syscalls
- || !test_bit(id, filter->sc)) {
- /* System call filtered out. */
- return;
- }
- }
- table = sc_table;
- table_len = ARRAY_SIZE(sc_table);
- unknown_event = chan->sc_unknown;
- }
- if (unlikely(id < 0 || id >= table_len)) {
- syscall_entry_unknown(unknown_event, regs, id);
- return;
+ 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);
}
- if (unlikely(in_compat_syscall()))
- event = chan->compat_sc_table[id];
- else
- event = chan->sc_table[id];
- if (unlikely(!event)) {
- syscall_entry_unknown(unknown_event, regs, id);
- return;
+}
+
+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);
}
- entry = &table[id];
- WARN_ON_ONCE(!entry);
+}
- switch (entry->nrargs) {
+static __always_inline
+void syscall_entry_call_func(void *func, unsigned int nrargs, void *data,
+ struct pt_regs *regs)
+{
+ switch (nrargs) {
case 0:
{
- void (*fptr)(void *__data) = entry->func;
+ void (*fptr)(void *__data) = func;
- fptr(event);
+ fptr(data);
break;
}
case 1:
{
- void (*fptr)(void *__data, unsigned long arg0) = entry->func;
+ void (*fptr)(void *__data, unsigned long arg0) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0]);
+ fptr(data, args[0]);
break;
}
case 2:
{
void (*fptr)(void *__data,
unsigned long arg0,
- unsigned long arg1) = entry->func;
+ unsigned long arg1) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1]);
+ fptr(data, args[0], args[1]);
break;
}
case 3:
void (*fptr)(void *__data,
unsigned long arg0,
unsigned long arg1,
- unsigned long arg2) = entry->func;
+ unsigned long arg2) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2]);
+ fptr(data, args[0], args[1], args[2]);
break;
}
case 4:
unsigned long arg0,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3) = entry->func;
+ unsigned long arg3) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2], args[3]);
+ fptr(data, args[0], args[1], args[2], args[3]);
break;
}
case 5:
unsigned long arg1,
unsigned long arg2,
unsigned long arg3,
- unsigned long arg4) = entry->func;
+ unsigned long arg4) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2], args[3], args[4]);
+ fptr(data, args[0], args[1], args[2], args[3], args[4]);
break;
}
case 6:
unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5) = entry->func;
+ unsigned long arg5) = func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
- fptr(event, args[0], args[1], args[2],
+ fptr(data, args[0], args[1], args[2],
args[3], args[4], args[5]);
break;
}
}
}
-static void syscall_exit_unknown(struct lttng_event *event,
- struct pt_regs *regs, int id, long ret)
+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;
+ struct lttng_event *event, *unknown_event;
+ const struct trace_syscall_entry *table, *entry;
+ size_t table_len;
+
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = chan->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_compat_entry))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = compat_sc_table;
+ table_len = ARRAY_SIZE(compat_sc_table);
+ unknown_event = chan->sc_compat_unknown;
+ } else {
+ struct lttng_syscall_filter *filter = chan->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_entry))) {
+ /* System call filtered out. */
+ return;
+ }
+ table = sc_table;
+ table_len = ARRAY_SIZE(sc_table);
+ unknown_event = chan->sc_unknown;
+ }
+ if (unlikely(id < 0 || id >= table_len)) {
+ syscall_entry_event_unknown(unknown_event, regs, id);
+ return;
+ }
+ if (unlikely(in_compat_syscall()))
+ event = chan->compat_sc_table[id];
+ else
+ event = chan->sc_table[id];
+ if (unlikely(!event)) {
+ syscall_entry_event_unknown(unknown_event, regs, id);
+ return;
+ }
+ entry = &table[id];
+ 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, long id, long ret)
{
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
__event_probe__syscall_exit_unknown(event, id, ret, args);
}
-void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret)
+void syscall_exit_event_probe(void *__data, struct pt_regs *regs, long ret)
{
struct lttng_channel *chan = __data;
struct lttng_event *event, *unknown_event;
id = syscall_get_nr(current, regs);
if (unlikely(in_compat_syscall())) {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
+ struct lttng_syscall_filter *filter = chan->sc_filter;
+
+ if (id < 0 || id >= NR_compat_syscalls
+ || (!READ_ONCE(chan->syscall_all) && !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_event = chan->compat_sc_exit_unknown;
} else {
- struct lttng_syscall_filter *filter;
-
- filter = lttng_rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id < 0 || id >= NR_syscalls
- || !test_bit(id, filter->sc)) {
- /* System call filtered out. */
- return;
- }
+ struct lttng_syscall_filter *filter = chan->sc_filter;
+
+ if (id < 0 || id >= NR_syscalls
+ || (!READ_ONCE(chan->syscall_all) && !test_bit(id, filter->sc_exit))) {
+ /* System call filtered out. */
+ return;
}
table = sc_exit_table;
table_len = ARRAY_SIZE(sc_exit_table);
unknown_event = chan->sc_exit_unknown;
}
if (unlikely(id < 0 || id >= table_len)) {
- syscall_exit_unknown(unknown_event, regs, id, ret);
+ syscall_exit_event_unknown(unknown_event, regs, id, ret);
return;
}
if (unlikely(in_compat_syscall()))
else
event = chan->sc_exit_table[id];
if (unlikely(!event)) {
- syscall_exit_unknown(unknown_event, regs, id, ret);
+ syscall_exit_event_unknown(unknown_event, regs, id, ret);
return;
}
entry = &table[id];
- WARN_ON_ONCE(!entry);
+ WARN_ON_ONCE(!entry->event_func);
switch (entry->nrargs) {
case 0:
{
- void (*fptr)(void *__data, long ret) = entry->func;
+ void (*fptr)(void *__data, long ret) = entry->event_func;
fptr(event, ret);
break;
{
void (*fptr)(void *__data,
long ret,
- unsigned long arg0) = entry->func;
+ unsigned long arg0) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
void (*fptr)(void *__data,
long ret,
unsigned long arg0,
- unsigned long arg1) = entry->func;
+ unsigned long arg1) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
long ret,
unsigned long arg0,
unsigned long arg1,
- unsigned long arg2) = entry->func;
+ unsigned long arg2) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
unsigned long arg0,
unsigned long arg1,
unsigned long arg2,
- unsigned long arg3) = entry->func;
+ unsigned long arg3) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
unsigned long arg1,
unsigned long arg2,
unsigned long arg3,
- unsigned long arg4) = entry->func;
+ unsigned long arg4) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
unsigned long arg2,
unsigned long arg3,
unsigned long arg4,
- unsigned long arg5) = entry->func;
+ unsigned long arg5) = entry->event_func;
unsigned long args[LTTNG_SYSCALL_NR_ARGS];
lttng_syscall_get_arguments(current, regs, args);
}
}
-/*
- * noinline to diminish caller stack size.
- * Should be called with sessions lock held.
- */
-static
-int fill_table(const struct trace_syscall_entry *table, size_t table_len,
- struct lttng_event **chan_table, struct lttng_channel *chan,
- void *filter, enum sc_type type)
+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)
{
- const struct lttng_event_desc *desc;
- unsigned int i;
+ struct lttng_event_notifier *notifier;
- /* Allocate events for each syscall, insert into table */
- for (i = 0; i < table_len; i++) {
- struct lttng_kernel_event ev;
- desc = table[i].desc;
+ switch (nrargs) {
+ case 0:
+ {
+ void (*fptr)(void *__data, long ret) = func;
- if (!desc) {
- /* Unknown syscall */
- continue;
- }
- /*
- * Skip those already populated by previous failed
- * register for this channel.
- */
- if (chan_table[i])
- continue;
- memset(&ev, 0, sizeof(ev));
- switch (type) {
- case SC_TYPE_ENTRY:
- strncpy(ev.name, SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- case SC_TYPE_EXIT:
- strncpy(ev.name, SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- case SC_TYPE_COMPAT_ENTRY:
- strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- case SC_TYPE_COMPAT_EXIT:
- strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- default:
- BUG_ON(1);
- break;
- }
- strncat(ev.name, desc->name,
- LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
- ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_SYSCALL;
- chan_table[i] = _lttng_event_create(chan, &ev, filter,
- desc, ev.instrumentation);
- WARN_ON_ONCE(!chan_table[i]);
- if (IS_ERR(chan_table[i])) {
- /*
- * If something goes wrong in event registration
- * after the first one, we have no choice but to
- * leave the previous events in there, until
- * deleted by session teardown.
- */
- return PTR_ERR(chan_table[i]);
- }
+ lttng_hlist_for_each_entry_rcu(notifier, dispatch_list, u.syscall.node)
+ fptr(notifier, ret);
+ break;
}
- return 0;
-}
-
-/*
- * Should be called with sessions lock held.
- */
-int lttng_syscalls_register(struct lttng_channel *chan, void *filter)
-{
- struct lttng_kernel_event ev;
- int ret;
-
- wrapper_vmalloc_sync_mappings();
+ case 1:
+ {
+ void (*fptr)(void *__data, long ret, unsigned long arg0) = func;
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- if (!chan->sc_table) {
- /* create syscall table mapping syscall to events */
- chan->sc_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_table), GFP_KERNEL);
- if (!chan->sc_table)
- return -ENOMEM;
+ 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;
}
- if (!chan->sc_exit_table) {
- /* create syscall table mapping syscall to events */
- chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
- * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
- if (!chan->sc_exit_table)
+ 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.
+ */
+static
+int fill_event_table(const struct trace_syscall_entry *table, size_t table_len,
+ struct lttng_event **chan_table, struct lttng_channel *chan,
+ void *filter, enum sc_type type)
+{
+ const struct lttng_event_desc *desc;
+ unsigned int i;
+
+ /* Allocate events for each syscall, insert into table */
+ for (i = 0; i < table_len; i++) {
+ struct lttng_kernel_event ev;
+ desc = table[i].desc;
+
+ if (!desc) {
+ /* Unknown syscall */
+ continue;
+ }
+ /*
+ * Skip those already populated by previous failed
+ * register for this channel.
+ */
+ if (chan_table[i])
+ continue;
+ memset(&ev, 0, sizeof(ev));
+ switch (type) {
+ case SC_TYPE_ENTRY:
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_EXIT:
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
+ break;
+ case SC_TYPE_COMPAT_ENTRY:
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ case SC_TYPE_COMPAT_EXIT:
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
+ break;
+ }
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN - 1);
+ ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
+ ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ chan_table[i] = _lttng_event_create(chan, &ev, filter,
+ desc, ev.instrumentation);
+ WARN_ON_ONCE(!chan_table[i]);
+ if (IS_ERR(chan_table[i])) {
+ /*
+ * If something goes wrong in event registration
+ * after the first one, we have no choice but to
+ * leave the previous events in there, until
+ * deleted by session teardown.
+ */
+ return PTR_ERR(chan_table[i]);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Should be called with sessions lock held.
+ */
+int lttng_syscalls_register_event(struct lttng_channel *chan, void *filter)
+{
+ struct lttng_kernel_event ev;
+ int ret;
+
+ wrapper_vmalloc_sync_mappings();
+
+ if (!chan->sc_table) {
+ /* create syscall table mapping syscall to events */
+ chan->sc_table = kzalloc(sizeof(struct lttng_event *)
+ * ARRAY_SIZE(sc_table), GFP_KERNEL);
+ if (!chan->sc_table)
+ return -ENOMEM;
+ }
+ if (!chan->sc_exit_table) {
+ /* create syscall table mapping syscall to events */
+ chan->sc_exit_table = kzalloc(sizeof(struct lttng_event *)
+ * ARRAY_SIZE(sc_exit_table), GFP_KERNEL);
+ if (!chan->sc_exit_table)
return -ENOMEM;
}
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
chan->sc_unknown = _lttng_event_create(chan, &ev, filter,
desc,
ev.instrumentation);
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
chan->sc_compat_unknown = _lttng_event_create(chan, &ev, filter,
desc,
ev.instrumentation);
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
chan->compat_sc_exit_unknown = _lttng_event_create(chan, &ev,
filter, desc,
ev.instrumentation);
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
ev.instrumentation = LTTNG_KERNEL_SYSCALL;
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
chan->sc_exit_unknown = _lttng_event_create(chan, &ev, filter,
desc, ev.instrumentation);
WARN_ON_ONCE(!chan->sc_exit_unknown);
}
}
- ret = fill_table(sc_table, ARRAY_SIZE(sc_table),
+ ret = fill_event_table(sc_table, ARRAY_SIZE(sc_table),
chan->sc_table, chan, filter, SC_TYPE_ENTRY);
if (ret)
return ret;
- ret = fill_table(sc_exit_table, ARRAY_SIZE(sc_exit_table),
+ ret = fill_event_table(sc_exit_table, ARRAY_SIZE(sc_exit_table),
chan->sc_exit_table, chan, filter, SC_TYPE_EXIT);
if (ret)
return ret;
#ifdef CONFIG_COMPAT
- ret = fill_table(compat_sc_table, ARRAY_SIZE(compat_sc_table),
+ ret = fill_event_table(compat_sc_table, ARRAY_SIZE(compat_sc_table),
chan->compat_sc_table, chan, filter,
SC_TYPE_COMPAT_ENTRY);
if (ret)
return ret;
- ret = fill_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
+ ret = fill_event_table(compat_sc_exit_table, ARRAY_SIZE(compat_sc_exit_table),
chan->compat_sc_exit_table, chan, filter,
SC_TYPE_COMPAT_EXIT);
if (ret)
return ret;
#endif
+
+ if (!chan->sc_filter) {
+ chan->sc_filter = kzalloc(sizeof(struct lttng_syscall_filter),
+ GFP_KERNEL);
+ if (!chan->sc_filter)
+ return -ENOMEM;
+ }
+
if (!chan->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_enter",
- (void *) syscall_entry_probe, chan);
+ (void *) syscall_entry_event_probe, chan);
if (ret)
return ret;
chan->sys_enter_registered = 1;
*/
if (!chan->sys_exit_registered) {
ret = lttng_wrapper_tracepoint_probe_register("sys_exit",
- (void *) syscall_exit_probe, chan);
+ (void *) syscall_exit_event_probe, chan);
if (ret) {
WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_probe, chan));
+ (void *) syscall_entry_event_probe, chan));
return ret;
}
chan->sys_exit_registered = 1;
}
/*
- * Only called at session destruction.
+ * Should be called with sessions lock held.
*/
-int lttng_syscalls_unregister(struct lttng_channel *chan)
+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;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
+ 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,
+ error_counter_index, 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;
+ uint64_t error_counter_index = event_notifier_enabler->error_counter_index;
+ 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,
+ error_counter_index, 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;
if (chan->sys_enter_registered) {
ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_probe, chan);
+ (void *) syscall_entry_event_probe, chan);
if (ret)
return ret;
chan->sys_enter_registered = 0;
}
if (chan->sys_exit_registered) {
ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
- (void *) syscall_exit_probe, chan);
+ (void *) syscall_exit_event_probe, chan);
if (ret)
return ret;
chan->sys_exit_registered = 0;
}
- /* lttng_event destroy will be performed by lttng_session_destroy() */
+ return 0;
+}
+
+int lttng_syscalls_destroy_event(struct lttng_channel *chan)
+{
kfree(chan->sc_table);
kfree(chan->sc_exit_table);
#ifdef CONFIG_COMPAT
return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
}
-int lttng_syscall_filter_enable(struct lttng_channel *chan,
- const char *name)
+static
+const char *get_syscall_name(const char *desc_name,
+ enum lttng_syscall_abi abi,
+ enum lttng_syscall_entryexit entryexit)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ size_t prefix_len = 0;
- WARN_ON_ONCE(!chan->sc_table);
- if (!name) {
- /* Enable all system calls by removing filter */
- if (chan->sc_filter) {
- filter = chan->sc_filter;
- rcu_assign_pointer(chan->sc_filter, NULL);
- synchronize_trace();
- kfree(filter);
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ prefix_len = strlen(SYSCALL_ENTRY_STR);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ prefix_len = strlen(COMPAT_SYSCALL_ENTRY_STR);
+ break;
}
- chan->syscall_all = 1;
- return 0;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ prefix_len = strlen(SYSCALL_EXIT_STR);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ prefix_len = strlen(COMPAT_SYSCALL_EXIT_STR);
+ break;
+ }
+ break;
}
+ WARN_ON_ONCE(prefix_len == 0);
+ return desc_name + prefix_len;
+}
- if (!chan->sc_filter) {
- if (chan->syscall_all) {
- /*
- * All syscalls are already enabled.
- */
- return -EEXIST;
+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)
+{
+ const char *syscall_name;
+ unsigned long *bitmap;
+ int syscall_nr;
+
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
+
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ syscall_nr = get_syscall_nr(syscall_name);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ syscall_nr = get_compat_syscall_nr(syscall_name);
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_entry;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_entry;
+ break;
+ default:
+ return -EINVAL;
}
- filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!filter)
- return -ENOMEM;
- } else {
- filter = chan->sc_filter;
- }
- syscall_nr = get_syscall_nr(name);
- compat_syscall_nr = get_compat_syscall_nr(name);
- if (syscall_nr < 0 && compat_syscall_nr < 0) {
- ret = -ENOENT;
- goto error;
- }
- if (syscall_nr >= 0) {
- if (test_bit(syscall_nr, filter->sc)) {
- ret = -EEXIST;
- goto error;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_exit;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_exit;
+ break;
+ default:
+ return -EINVAL;
}
- bitmap_set(filter->sc, syscall_nr, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+ if (test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_set(bitmap, syscall_nr, 1);
+ 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;
}
- if (compat_syscall_nr >= 0) {
- if (test_bit(compat_syscall_nr, filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+
+ 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;
}
- bitmap_set(filter->sc_compat, compat_syscall_nr, 1);
+ break;
}
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
- return 0;
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
+ hlist_add_head_rcu(¬ifier->u.syscall.node, dispatch_list);
+
+end:
+ return ret ;
}
-int lttng_syscall_filter_disable(struct lttng_channel *chan,
- const char *name)
+int lttng_syscall_filter_enable_event(
+ struct lttng_channel *channel,
+ struct lttng_event *event)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL);
- WARN_ON_ONCE(!chan->sc_table);
+ return lttng_syscall_filter_enable(channel->sc_filter,
+ event->desc->name, event->u.syscall.abi,
+ event->u.syscall.entryexit);
+}
- if (!chan->sc_filter) {
- if (!chan->syscall_all)
- return -EEXIST;
- filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!filter)
- return -ENOMEM;
- /* Trace all system calls, then apply disable. */
- bitmap_set(filter->sc, 0, NR_syscalls);
- bitmap_set(filter->sc_compat, 0, NR_compat_syscalls);
- } else {
- filter = chan->sc_filter;
- }
+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;
- if (!name) {
- /* Fail if all syscalls are already disabled. */
- if (bitmap_empty(filter->sc, NR_syscalls)
- && bitmap_empty(filter->sc_compat,
- NR_compat_syscalls)) {
- ret = -EEXIST;
- goto error;
- }
+ syscall_name = get_syscall_name(desc_name, abi, entryexit);
- /* Disable all system calls */
- bitmap_clear(filter->sc, 0, NR_syscalls);
- bitmap_clear(filter->sc_compat, 0, NR_compat_syscalls);
- goto apply_filter;
- }
- syscall_nr = get_syscall_nr(name);
- compat_syscall_nr = get_compat_syscall_nr(name);
- if (syscall_nr < 0 && compat_syscall_nr < 0) {
- ret = -ENOENT;
- goto error;
- }
- if (syscall_nr >= 0) {
- if (!test_bit(syscall_nr, filter->sc)) {
- ret = -EEXIST;
- goto error;
- }
- bitmap_clear(filter->sc, syscall_nr, 1);
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ syscall_nr = get_syscall_nr(syscall_name);
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ syscall_nr = get_compat_syscall_nr(syscall_name);
+ break;
+ default:
+ return -EINVAL;
}
- if (compat_syscall_nr >= 0) {
- if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_entry;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_entry;
+ break;
+ default:
+ return -EINVAL;
}
- bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (abi) {
+ case LTTNG_SYSCALL_ABI_NATIVE:
+ bitmap = filter->sc_exit;
+ break;
+ case LTTNG_SYSCALL_ABI_COMPAT:
+ bitmap = filter->sc_compat_exit;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
}
-apply_filter:
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
- chan->syscall_all = 0;
+ if (!test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_clear(bitmap, syscall_nr, 1);
+
return 0;
+}
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
+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
.release = seq_release,
};
+/*
+ * A syscall is enabled if it is traced for either entry or exit.
+ */
long lttng_channel_syscall_mask(struct lttng_channel *channel,
struct lttng_kernel_syscall_mask __user *usyscall_mask)
{
char state;
if (channel->sc_table) {
- if (filter)
- state = test_bit(bit, filter->sc);
+ if (!READ_ONCE(channel->syscall_all) && filter)
+ state = test_bit(bit, filter->sc_entry)
+ || test_bit(bit, filter->sc_exit);
else
state = 1;
} else {
char state;
if (channel->compat_sc_table) {
- if (filter)
+ if (!READ_ONCE(channel->syscall_all) && filter)
state = test_bit(bit - ARRAY_SIZE(sc_table),
- filter->sc_compat);
+ filter->sc_compat_entry)
+ || test_bit(bit - ARRAY_SIZE(sc_table),
+ filter->sc_compat_exit);
else
state = 1;
} else {
projects / lttng-modules.git / blobdiff