-/*
+/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
+ *
* lttng-syscalls.c
*
* LTTng syscall probes.
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; only
- * version 2.1 of the License.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/seq_file.h>
+#include <linux/stringify.h>
+#include <linux/file.h>
+#include <linux/anon_inodes.h>
#include <asm/ptrace.h>
#include <asm/syscall.h>
-#include "wrapper/tracepoint.h"
-#include "lttng-events.h"
+#include <lib/bitfield.h>
+#include <wrapper/tracepoint.h>
+#include <wrapper/file.h>
+#include <wrapper/rcu.h>
+#include <wrapper/syscall.h>
+#include <lttng-events.h>
#ifndef CONFIG_COMPAT
# ifndef is_compat_task
# endif
#endif
+/* in_compat_syscall appears in kernel 4.6. */
+#ifndef in_compat_syscall
+ #define in_compat_syscall() is_compat_task()
+#endif
+
enum sc_type {
SC_TYPE_ENTRY,
SC_TYPE_EXIT,
SC_TYPE_COMPAT_EXIT,
};
-#define SYSCALL_ENTRY_STR "syscall_entry_"
-#define COMPAT_SYSCALL_ENTRY_STR "compat_syscall_entry_"
-#define SYSCALL_EXIT_STR "syscall_exit_"
-#define COMPAT_SYSCALL_EXIT_STR "compat_syscall_exit_"
+#define SYSCALL_ENTRY_TOK syscall_entry_
+#define COMPAT_SYSCALL_ENTRY_TOK compat_syscall_entry_
+#define SYSCALL_EXIT_TOK syscall_exit_
+#define COMPAT_SYSCALL_EXIT_TOK compat_syscall_exit_
+
+#define SYSCALL_ENTRY_STR __stringify(SYSCALL_ENTRY_TOK)
+#define COMPAT_SYSCALL_ENTRY_STR __stringify(COMPAT_SYSCALL_ENTRY_TOK)
+#define SYSCALL_EXIT_STR __stringify(SYSCALL_EXIT_TOK)
+#define COMPAT_SYSCALL_EXIT_STR __stringify(COMPAT_SYSCALL_EXIT_TOK)
static
void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
struct old_utsname;
struct sel_arg_struct;
struct mmap_arg_struct;
+struct file_handle;
+struct user_msghdr;
+
+/*
+ * Forward declaration for kernels >= 5.6
+ */
+struct timex;
+struct timeval;
+struct itimerval;
+struct itimerspec;
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
+typedef __kernel_old_time_t time_t;
+#endif
#ifdef IA32_NR_syscalls
#define NR_compat_syscalls IA32_NR_syscalls
#define LTTNG_PACKAGE_BUILD
#define CREATE_TRACE_POINTS
#define TP_MODULE_NOINIT
-#define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers
+#define TRACE_INCLUDE_PATH instrumentation/syscalls/headers
#define PARAMS(args...) args
/* Handle unknown syscalls */
+#undef TRACE_SYSTEM
#define TRACE_SYSTEM syscalls_unknown
-#include "instrumentation/syscalls/headers/syscalls_unknown.h"
+#include <instrumentation/syscalls/headers/syscalls_unknown.h>
#undef TRACE_SYSTEM
#define SC_ENTER
/* Hijack probe callback for system call enter */
#undef TP_PROBE_CB
#define TP_PROBE_CB(_template) &syscall_entry_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CODE(syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_enter_##_name, PARAMS(_struct), PARAMS(_assign), \
- PARAMS(_printk))
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
+ LTTNG_TRACEPOINT_EVENT(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
+ PARAMS(_fields))
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+ LTTNG_TRACEPOINT_EVENT_CODE(syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
+ PARAMS(_locvar), PARAMS(_code_pre), \
+ PARAMS(_fields), PARAMS(_code_post))
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_entry_##_name, PARAMS(_fields))
#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_enter_##_template, syscall_enter_##_name)
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_entry_##_template, syscall_entry_##_name)
+/* Enumerations only defined at first inclusion. */
+#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values) \
+ LTTNG_TRACEPOINT_ENUM(_name, PARAMS(_values))
#undef TRACE_SYSTEM
-#define TRACE_SYSTEM syscall_enter_integers
+#define TRACE_SYSTEM syscall_entry_integers
#define TRACE_INCLUDE_FILE syscalls_integers
-#include "instrumentation/syscalls/headers/syscalls_integers.h"
+#include <instrumentation/syscalls/headers/syscalls_integers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
-#define TRACE_SYSTEM syscall_enter_pointers
+#define TRACE_SYSTEM syscall_entry_pointers
#define TRACE_INCLUDE_FILE syscalls_pointers
-#include "instrumentation/syscalls/headers/syscalls_pointers.h"
+#include <instrumentation/syscalls/headers/syscalls_pointers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
+#undef SC_LTTNG_TRACEPOINT_ENUM
#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
#undef SC_LTTNG_TRACEPOINT_EVENT
#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
/* Hijack probe callback for compat system call enter */
#define TP_PROBE_CB(_template) &syscall_entry_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_struct), PARAMS(_assign), \
- PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_enter_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_enter_##_name, PARAMS(_struct), \
- PARAMS(_assign), PARAMS(_printk))
+#define LTTNG_SC_COMPAT
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
+ LTTNG_TRACEPOINT_EVENT(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
+ PARAMS(_fields))
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
+ LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_entry_##_name, PARAMS(_proto), PARAMS(_args), \
+ PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_entry_##_name, PARAMS(_fields))
#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
- LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_enter_##_template, \
- compat_syscall_enter_##_name)
-#define TRACE_SYSTEM compat_syscall_enter_integers
+ LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_entry_##_template, \
+ compat_syscall_entry_##_name)
+/* Enumerations only defined at inital inclusion (not here). */
+#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
+#define TRACE_SYSTEM compat_syscall_entry_integers
#define TRACE_INCLUDE_FILE compat_syscalls_integers
-#include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
+#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
-#define TRACE_SYSTEM compat_syscall_enter_pointers
+#define TRACE_SYSTEM compat_syscall_entry_pointers
#define TRACE_INCLUDE_FILE compat_syscalls_pointers
-#include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
+#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
+#undef SC_LTTNG_TRACEPOINT_ENUM
#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
#undef SC_LTTNG_TRACEPOINT_EVENT
#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
#undef TP_PROBE_CB
#undef _TRACE_SYSCALLS_INTEGERS_H
#undef _TRACE_SYSCALLS_POINTERS_H
+#undef LTTNG_SC_COMPAT
#undef SC_ENTER
/* Hijack probe callback for system call exit */
#define TP_PROBE_CB(_template) &syscall_exit_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+ PARAMS(_fields))
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
LTTNG_TRACEPOINT_EVENT_CODE(syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_struct), \
- PARAMS(_assign), PARAMS(_printk))
+ PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(syscall_exit_##_name, PARAMS(_fields))
#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(syscall_exit_##_template, \
syscall_exit_##_name)
+/* Enumerations only defined at inital inclusion (not here). */
+#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
#define TRACE_SYSTEM syscall_exit_integers
#define TRACE_INCLUDE_FILE syscalls_integers
-#include "instrumentation/syscalls/headers/syscalls_integers.h"
+#include <instrumentation/syscalls/headers/syscalls_integers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
#define TRACE_SYSTEM syscall_exit_pointers
#define TRACE_INCLUDE_FILE syscalls_pointers
-#include "instrumentation/syscalls/headers/syscalls_pointers.h"
+#include <instrumentation/syscalls/headers/syscalls_pointers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
+#undef SC_LTTNG_TRACEPOINT_ENUM
#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
#undef SC_LTTNG_TRACEPOINT_EVENT
#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
/* Hijack probe callback for compat system call exit */
#define TP_PROBE_CB(_template) &syscall_exit_probe
-#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _struct, _assign, _printk) \
+#define LTTNG_SC_COMPAT
+#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \
LTTNG_TRACEPOINT_EVENT(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code, _struct, _assign, _printk) \
+ PARAMS(_fields))
+#define SC_LTTNG_TRACEPOINT_EVENT_CODE(_name, _proto, _args, _locvar, _code_pre, _fields, _code_post) \
LTTNG_TRACEPOINT_EVENT_CODE(compat_syscall_exit_##_name, PARAMS(_proto), PARAMS(_args), \
- PARAMS(_locvar), PARAMS(_code), \
- PARAMS(_struct), PARAMS(_assign), PARAMS(_printk))
-#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _struct, _assign, _printk) \
- LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_struct), \
- PARAMS(_assign), PARAMS(_printk))
+ PARAMS(_locvar), PARAMS(_code_pre), PARAMS(_fields), PARAMS(_code_post))
+#define SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(_name, _fields) \
+ LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS(compat_syscall_exit_##_name, PARAMS(_fields))
#define SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(_template, _name) \
LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS(compat_syscall_exit_##_template, \
compat_syscall_exit_##_name)
+/* Enumerations only defined at inital inclusion (not here). */
+#define SC_LTTNG_TRACEPOINT_ENUM(_name, _values)
#define TRACE_SYSTEM compat_syscall_exit_integers
#define TRACE_INCLUDE_FILE compat_syscalls_integers
-#include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
+#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
#define TRACE_SYSTEM compat_syscall_exit_pointers
#define TRACE_INCLUDE_FILE compat_syscalls_pointers
-#include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
+#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
#undef TRACE_INCLUDE_FILE
#undef TRACE_SYSTEM
+#undef SC_LTTNG_TRACEPOINT_ENUM
#undef SC_LTTNG_TRACEPOINT_EVENT_CODE
#undef SC_LTTNG_TRACEPOINT_EVENT
#undef SC_LTTNG_TRACEPOINT_EVENT_CLASS_NOARGS
#undef TP_PROBE_CB
#undef _TRACE_SYSCALLS_INTEGERS_H
#undef _TRACE_SYSCALLS_POINTERS_H
+#undef LTTNG_SC_COMPAT
#undef SC_EXIT
#undef TRACE_SYSCALL_TABLE
#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \
[ _nr ] = { \
- .func = __event_probe__syscall_enter_##_template, \
+ .func = __event_probe__syscall_entry_##_template, \
.nrargs = (_nrargs), \
- .fields = __event_fields___syscall_enter_##_template, \
- .desc = &__event_desc___syscall_enter_##_name, \
+ .fields = __event_fields___syscall_entry_##_template, \
+ .desc = &__event_desc___syscall_entry_##_name, \
},
/* 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"
+#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_enter_##_template, \
+ .func = __event_probe__compat_syscall_entry_##_template, \
.nrargs = (_nrargs), \
- .fields = __event_fields___compat_syscall_enter_##_template, \
- .desc = &__event_desc___compat_syscall_enter_##_name, \
+ .fields = __event_fields___compat_syscall_entry_##_template, \
+ .desc = &__event_desc___compat_syscall_entry_##_name, \
},
/* 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"
+#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
+#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
};
#undef SC_ENTER
/* 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"
+#include <instrumentation/syscalls/headers/syscalls_integers.h>
+#include <instrumentation/syscalls/headers/syscalls_pointers.h>
};
#undef TRACE_SYSCALL_TABLE
/* 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"
+#include <instrumentation/syscalls/headers/compat_syscalls_integers.h>
+#include <instrumentation/syscalls/headers/compat_syscalls_pointers.h>
};
#undef SC_EXIT
#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)
{
- unsigned long args[UNKNOWN_SYSCALL_NRARGS];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args);
- if (unlikely(is_compat_task()))
- __event_probe__compat_syscall_enter_unknown(event, id, args);
+ lttng_syscall_get_arguments(current, regs, args);
+ if (unlikely(in_compat_syscall()))
+ __event_probe__compat_syscall_entry_unknown(event, id, args);
else
- __event_probe__syscall_enter_unknown(event, id, args);
+ __event_probe__syscall_entry_unknown(event, id, args);
}
void syscall_entry_probe(void *__data, struct pt_regs *regs, long id)
const struct trace_syscall_entry *table, *entry;
size_t table_len;
- if (unlikely(is_compat_task())) {
- struct lttng_syscall_filter *filter;
+ if (unlikely(in_compat_syscall())) {
+ struct lttng_syscall_filter *filter = chan->sc_filter;
- filter = rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
+ 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;
-
- filter = rcu_dereference(chan->sc_filter);
- if (filter) {
- if (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_entry))) {
+ /* System call filtered out. */
+ return;
}
table = sc_table;
table_len = ARRAY_SIZE(sc_table);
unknown_event = chan->sc_unknown;
}
- if (unlikely(id >= table_len)) {
+ if (unlikely(id < 0 || id >= table_len)) {
syscall_entry_unknown(unknown_event, regs, id);
return;
}
- if (unlikely(is_compat_task()))
+ if (unlikely(in_compat_syscall()))
event = chan->compat_sc_table[id];
else
event = chan->sc_table[id];
case 1:
{
void (*fptr)(void *__data, unsigned long arg0) = entry->func;
- unsigned long args[1];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, args[0]);
break;
}
void (*fptr)(void *__data,
unsigned long arg0,
unsigned long arg1) = entry->func;
- unsigned long args[2];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, args[0], args[1]);
break;
}
unsigned long arg0,
unsigned long arg1,
unsigned long arg2) = entry->func;
- unsigned long args[3];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, args[0], args[1], args[2]);
break;
}
unsigned long arg1,
unsigned long arg2,
unsigned long arg3) = entry->func;
- unsigned long args[4];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, args[0], args[1], args[2], args[3]);
break;
}
unsigned long arg2,
unsigned long arg3,
unsigned long arg4) = entry->func;
- unsigned long args[5];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, args[0], args[1], args[2], args[3], args[4]);
break;
}
unsigned long arg3,
unsigned long arg4,
unsigned long arg5) = entry->func;
- unsigned long args[6];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, 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, unsigned int id, long ret)
+ struct pt_regs *regs, int id, long ret)
{
- unsigned long args[UNKNOWN_SYSCALL_NRARGS];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, UNKNOWN_SYSCALL_NRARGS, args);
- if (unlikely(is_compat_task()))
+ lttng_syscall_get_arguments(current, regs, args);
+ if (unlikely(in_compat_syscall()))
__event_probe__compat_syscall_exit_unknown(event, id, ret,
args);
else
long id;
id = syscall_get_nr(current, regs);
- if (unlikely(is_compat_task())) {
- struct lttng_syscall_filter *filter;
-
- filter = rcu_dereference(chan->sc_filter);
- if (filter) {
- if (id >= NR_compat_syscalls
- || !test_bit(id, filter->sc_compat)) {
- /* System call filtered out. */
- return;
- }
+ 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_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 = rcu_dereference(chan->sc_filter);
- if (filter) {
- if (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 >= table_len)) {
+ if (unlikely(id < 0 || id >= table_len)) {
syscall_exit_unknown(unknown_event, regs, id, ret);
return;
}
- if (unlikely(is_compat_task()))
+ if (unlikely(in_compat_syscall()))
event = chan->compat_sc_exit_table[id];
else
event = chan->sc_exit_table[id];
void (*fptr)(void *__data,
long ret,
unsigned long arg0) = entry->func;
- unsigned long args[1];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0]);
break;
}
long ret,
unsigned long arg0,
unsigned long arg1) = entry->func;
- unsigned long args[2];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0], args[1]);
break;
}
unsigned long arg0,
unsigned long arg1,
unsigned long arg2) = entry->func;
- unsigned long args[3];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0], args[1], args[2]);
break;
}
unsigned long arg1,
unsigned long arg2,
unsigned long arg3) = entry->func;
- unsigned long args[4];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0], args[1], args[2], args[3]);
break;
}
unsigned long arg2,
unsigned long arg3,
unsigned long arg4) = entry->func;
- unsigned long args[5];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0], args[1], args[2], args[3], args[4]);
break;
}
unsigned long arg3,
unsigned long arg4,
unsigned long arg5) = entry->func;
- unsigned long args[6];
+ unsigned long args[LTTNG_SYSCALL_NR_ARGS];
- syscall_get_arguments(current, regs, 0, entry->nrargs, args);
+ lttng_syscall_get_arguments(current, regs, args);
fptr(event, ret, args[0], args[1], args[2],
args[3], args[4], args[5]);
break;
}
}
-/* noinline to diminish caller stack size */
+/*
+ * 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,
memset(&ev, 0, sizeof(ev));
switch (type) {
case SC_TYPE_ENTRY:
- strncpy(ev.name, SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
break;
case SC_TYPE_EXIT:
- strncpy(ev.name, SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_NATIVE;
break;
case SC_TYPE_COMPAT_ENTRY:
- strncpy(ev.name, COMPAT_SYSCALL_ENTRY_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_ENTRY;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
break;
case SC_TYPE_COMPAT_EXIT:
- strncpy(ev.name, COMPAT_SYSCALL_EXIT_STR,
- LTTNG_KERNEL_SYM_NAME_LEN);
- break;
- default:
- BUG_ON(1);
+ ev.u.syscall.entryexit = LTTNG_KERNEL_SYSCALL_EXIT;
+ ev.u.syscall.abi = LTTNG_KERNEL_SYSCALL_ABI_COMPAT;
break;
}
- strncat(ev.name, desc->name,
- LTTNG_KERNEL_SYM_NAME_LEN - strlen(ev.name) - 1);
+ strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_NOOP;
- chan_table[i] = lttng_event_create(chan, &ev, filter,
- desc);
+ 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])) {
/*
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_all();
+ wrapper_vmalloc_sync_mappings();
if (!chan->sc_table) {
/* create syscall table mapping syscall to events */
#endif
if (!chan->sc_unknown) {
const struct lttng_event_desc *desc =
- &__event_desc___syscall_enter_unknown;
+ &__event_desc___syscall_entry_unknown;
memset(&ev, 0, sizeof(ev));
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_NOOP;
- chan->sc_unknown = lttng_event_create(chan, &ev, filter,
- desc);
+ 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);
WARN_ON_ONCE(!chan->sc_unknown);
if (IS_ERR(chan->sc_unknown)) {
return PTR_ERR(chan->sc_unknown);
if (!chan->sc_compat_unknown) {
const struct lttng_event_desc *desc =
- &__event_desc___compat_syscall_enter_unknown;
+ &__event_desc___compat_syscall_entry_unknown;
memset(&ev, 0, sizeof(ev));
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_NOOP;
- chan->sc_compat_unknown = lttng_event_create(chan, &ev, filter,
- desc);
+ 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);
WARN_ON_ONCE(!chan->sc_unknown);
if (IS_ERR(chan->sc_compat_unknown)) {
return PTR_ERR(chan->sc_compat_unknown);
memset(&ev, 0, sizeof(ev));
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_NOOP;
- chan->compat_sc_exit_unknown = lttng_event_create(chan, &ev,
- filter, desc);
+ 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);
WARN_ON_ONCE(!chan->compat_sc_exit_unknown);
if (IS_ERR(chan->compat_sc_exit_unknown)) {
return PTR_ERR(chan->compat_sc_exit_unknown);
memset(&ev, 0, sizeof(ev));
strncpy(ev.name, desc->name, LTTNG_KERNEL_SYM_NAME_LEN);
ev.name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
- ev.instrumentation = LTTNG_KERNEL_NOOP;
- chan->sc_exit_unknown = lttng_event_create(chan, &ev, filter,
- desc);
+ 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);
if (IS_ERR(chan->sc_exit_unknown)) {
return PTR_ERR(chan->sc_exit_unknown);
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);
if (!chan->sc_table)
return 0;
if (chan->sys_enter_registered) {
- ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
- (void *) syscall_exit_probe, chan);
+ ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
+ (void *) syscall_entry_probe, chan);
if (ret)
return ret;
chan->sys_enter_registered = 0;
}
if (chan->sys_exit_registered) {
- ret = lttng_wrapper_tracepoint_probe_unregister("sys_enter",
- (void *) syscall_entry_probe, chan);
+ ret = lttng_wrapper_tracepoint_probe_unregister("sys_exit",
+ (void *) syscall_exit_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(struct lttng_channel *chan)
+{
kfree(chan->sc_table);
kfree(chan->sc_exit_table);
#ifdef CONFIG_COMPAT
return syscall_nr;
}
-int lttng_syscall_filter_enable(struct lttng_channel *chan,
- const char *name)
+static
+uint32_t get_sc_tables_len(void)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table);
+}
- WARN_ON_ONCE(!chan->sc_table);
+static
+const char *get_syscall_name(struct lttng_event *event)
+{
+ size_t prefix_len = 0;
- 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);
- }
- chan->syscall_all = 1;
- return 0;
- }
+ WARN_ON_ONCE(event->instrumentation != LTTNG_KERNEL_SYSCALL);
- if (!chan->sc_filter) {
- if (chan->syscall_all) {
- /*
- * All syscalls are already enabled.
- */
- return -EEXIST;
+ switch (event->u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (event->u.syscall.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;
}
- filter = kzalloc(sizeof(struct lttng_syscall_filter),
- GFP_KERNEL);
- if (!filter)
- return -ENOMEM;
- } else {
- filter = chan->sc_filter;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (event->u.syscall.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;
}
- 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;
+ WARN_ON_ONCE(prefix_len == 0);
+ return event->desc->name + prefix_len;
+}
+
+int lttng_syscall_filter_enable(struct lttng_channel *chan,
+ struct lttng_event *event)
+{
+ 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(event);
+
+ switch (event->u.syscall.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) {
- if (test_bit(syscall_nr, filter->sc)) {
- ret = -EEXIST;
- goto error;
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (event->u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (event->u.syscall.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_set(filter->sc, syscall_nr, 1);
- }
- if (compat_syscall_nr >= 0) {
- if (test_bit(compat_syscall_nr, filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (event->u.syscall.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_compat, compat_syscall_nr, 1);
+ break;
+ default:
+ return -EINVAL;
}
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
+ if (test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_set(bitmap, syscall_nr, 1);
return 0;
-
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
}
int lttng_syscall_filter_disable(struct lttng_channel *chan,
- const char *name)
+ struct lttng_event *event)
{
- int syscall_nr, compat_syscall_nr, ret;
- struct lttng_syscall_filter *filter;
+ struct lttng_syscall_filter *filter = chan->sc_filter;
+ const char *syscall_name;
+ unsigned long *bitmap;
+ int syscall_nr;
WARN_ON_ONCE(!chan->sc_table);
- if (!chan->sc_filter) {
- 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;
- }
+ syscall_name = get_syscall_name(event);
- if (!name) {
- /* 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;
+ switch (event->u.syscall.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) {
- if (!test_bit(syscall_nr, chan->sc_filter->sc)) {
- ret = -EEXIST;
- goto error;
+ if (syscall_nr < 0)
+ return -ENOENT;
+
+ switch (event->u.syscall.entryexit) {
+ case LTTNG_SYSCALL_ENTRY:
+ switch (event->u.syscall.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(chan->sc_filter->sc, syscall_nr, 1);
- }
- if (compat_syscall_nr >= 0) {
- if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) {
- ret = -EEXIST;
- goto error;
+ break;
+ case LTTNG_SYSCALL_EXIT:
+ switch (event->u.syscall.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_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1);
+ break;
+ default:
+ return -EINVAL;
}
-apply_filter:
- if (!chan->sc_filter)
- rcu_assign_pointer(chan->sc_filter, filter);
- chan->syscall_all = 0;
- return 0;
+ if (!test_bit(syscall_nr, bitmap))
+ return -EEXIST;
+ bitmap_clear(bitmap, syscall_nr, 1);
-error:
- if (!chan->sc_filter)
- kfree(filter);
- return ret;
+ return 0;
}
static
{
}
+static
+int get_sc_table(const struct trace_syscall_entry *entry,
+ const struct trace_syscall_entry **table,
+ unsigned int *bitness)
+{
+ if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
+ if (bitness)
+ *bitness = BITS_PER_LONG;
+ if (table)
+ *table = sc_table;
+ return 0;
+ }
+ if (!(entry >= compat_sc_table
+ && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table))) {
+ return -EINVAL;
+ }
+ if (bitness)
+ *bitness = 32;
+ if (table)
+ *table = compat_sc_table;
+ return 0;
+}
+
static
int syscall_list_show(struct seq_file *m, void *p)
{
const struct trace_syscall_entry *table, *entry = p;
unsigned int bitness;
+ unsigned long index;
+ int ret;
+ const char *name;
- if (entry >= sc_table && entry < sc_table + ARRAY_SIZE(sc_table)) {
- bitness = BITS_PER_LONG;
- table = sc_table;
+ ret = get_sc_table(entry, &table, &bitness);
+ if (ret)
+ return ret;
+ if (!entry->desc)
+ return 0;
+ if (table == sc_table) {
+ index = entry - table;
+ name = &entry->desc->name[strlen(SYSCALL_ENTRY_STR)];
} else {
- bitness = 32;
- table = compat_sc_table;
- WARN_ON_ONCE(!(entry >= compat_sc_table
- && entry < compat_sc_table + ARRAY_SIZE(compat_sc_table)));
+ index = (entry - table) + ARRAY_SIZE(sc_table);
+ name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)];
}
- seq_printf(m, "syscall { name = %s; bitness = %u; };\n",
- entry->desc->name,
- bitness);
+ seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n",
+ index, name, bitness);
return 0;
}
.llseek = seq_lseek,
.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)
+{
+ uint32_t len, sc_tables_len, bitmask_len;
+ int ret = 0, bit;
+ char *tmp_mask;
+ struct lttng_syscall_filter *filter;
+
+ ret = get_user(len, &usyscall_mask->len);
+ if (ret)
+ return ret;
+ sc_tables_len = get_sc_tables_len();
+ bitmask_len = ALIGN(sc_tables_len, 8) >> 3;
+ if (len < sc_tables_len) {
+ return put_user(sc_tables_len, &usyscall_mask->len);
+ }
+ /* Array is large enough, we can copy array to user-space. */
+ tmp_mask = kzalloc(bitmask_len, GFP_KERNEL);
+ if (!tmp_mask)
+ return -ENOMEM;
+ filter = channel->sc_filter;
+
+ for (bit = 0; bit < ARRAY_SIZE(sc_table); bit++) {
+ char state;
+
+ if (channel->sc_table) {
+ if (!READ_ONCE(channel->syscall_all) && filter)
+ state = test_bit(bit, filter->sc_entry)
+ || test_bit(bit, filter->sc_exit);
+ else
+ state = 1;
+ } else {
+ state = 0;
+ }
+ bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
+ }
+ for (; bit < sc_tables_len; bit++) {
+ char state;
+
+ if (channel->compat_sc_table) {
+ if (!READ_ONCE(channel->syscall_all) && filter)
+ state = test_bit(bit - ARRAY_SIZE(sc_table),
+ filter->sc_compat_entry)
+ || test_bit(bit - ARRAY_SIZE(sc_table),
+ filter->sc_compat_exit);
+ else
+ state = 1;
+ } else {
+ state = 0;
+ }
+ bt_bitfield_write_be(tmp_mask, char, bit, 1, state);
+ }
+ if (copy_to_user(usyscall_mask->mask, tmp_mask, bitmask_len))
+ ret = -EFAULT;
+ kfree(tmp_mask);
+ return ret;
+}
+
+int lttng_abi_syscall_list(void)
+{
+ struct file *syscall_list_file;
+ int file_fd, ret;
+
+ file_fd = lttng_get_unused_fd();
+ if (file_fd < 0) {
+ ret = file_fd;
+ goto fd_error;
+ }
+
+ syscall_list_file = anon_inode_getfile("[lttng_syscall_list]",
+ <tng_syscall_list_fops,
+ NULL, O_RDWR);
+ if (IS_ERR(syscall_list_file)) {
+ ret = PTR_ERR(syscall_list_file);
+ goto file_error;
+ }
+ ret = lttng_syscall_list_fops.open(NULL, syscall_list_file);
+ if (ret < 0)
+ goto open_error;
+ fd_install(file_fd, syscall_list_file);
+ return file_fd;
+
+open_error:
+ fput(syscall_list_file);
+file_error:
+ put_unused_fd(file_fd);
+fd_error:
+ return ret;
+}