X-Git-Url: http://git.lttng.org/?p=lttng-modules.git;a=blobdiff_plain;f=lttng-syscalls.c;h=bcc06b5cd03759db0334756b3433e806c58e3093;hp=a5b5f403fe359e6531650111fc05cb82a6c60aba;hb=HEAD;hpb=2df37e95fa4303ecc0db41334452665491533641 diff --git a/lttng-syscalls.c b/lttng-syscalls.c deleted file mode 100644 index a5b5f403..00000000 --- a/lttng-syscalls.c +++ /dev/null @@ -1,1325 +0,0 @@ -/* SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only) - * - * lttng-syscalls.c - * - * LTTng syscall probes. - * - * Copyright (C) 2010-2012 Mathieu Desnoyers - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -#ifndef CONFIG_COMPAT -# ifndef is_compat_task -# define is_compat_task() (0) -# 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_ENTRY, - SC_TYPE_COMPAT_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); -static -void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret); - -/* - * Forward declarations for old kernels. - */ -struct mmsghdr; -struct rlimit64; -struct oldold_utsname; -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 -#else -#define NR_compat_syscalls NR_syscalls -#endif - -/* - * Create LTTng tracepoint probes. - */ -#define LTTNG_PACKAGE_BUILD -#define CREATE_TRACE_POINTS -#define TP_MODULE_NOINIT -#define TRACE_INCLUDE_PATH instrumentation/syscalls/headers - -#define PARAMS(args...) args - -/* Handle unknown syscalls */ -#undef TRACE_SYSTEM -#define TRACE_SYSTEM syscalls_unknown -#include -#undef TRACE_SYSTEM - -#define SC_ENTER - -#undef sc_exit -#define sc_exit(...) -#undef sc_in -#define sc_in(...) __VA_ARGS__ -#undef sc_out -#define sc_out(...) -#undef sc_inout -#define sc_inout(...) __VA_ARGS__ - -/* 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, _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_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_entry_integers -#define TRACE_INCLUDE_FILE syscalls_integers -#include -#undef TRACE_INCLUDE_FILE -#undef TRACE_SYSTEM -#define TRACE_SYSTEM syscall_entry_pointers -#define TRACE_INCLUDE_FILE syscalls_pointers -#include -#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 SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS -#undef TP_PROBE_CB -#undef _TRACE_SYSCALLS_INTEGERS_H -#undef _TRACE_SYSCALLS_POINTERS_H - -/* Hijack probe callback for compat system call enter */ -#define TP_PROBE_CB(_template) &syscall_entry_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), \ - 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_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 -#undef TRACE_INCLUDE_FILE -#undef TRACE_SYSTEM -#define TRACE_SYSTEM compat_syscall_entry_pointers -#define TRACE_INCLUDE_FILE compat_syscalls_pointers -#include -#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 SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS -#undef TP_PROBE_CB -#undef _TRACE_SYSCALLS_INTEGERS_H -#undef _TRACE_SYSCALLS_POINTERS_H -#undef LTTNG_SC_COMPAT - -#undef SC_ENTER - -#define SC_EXIT - -#undef sc_exit -#define sc_exit(...) __VA_ARGS__ -#undef sc_in -#define sc_in(...) -#undef sc_out -#define sc_out(...) __VA_ARGS__ -#undef sc_inout -#define sc_inout(...) __VA_ARGS__ - -/* Hijack probe callback for system call exit */ -#define TP_PROBE_CB(_template) &syscall_exit_probe -#define SC_LTTNG_TRACEPOINT_EVENT(_name, _proto, _args, _fields) \ - LTTNG_TRACEPOINT_EVENT(syscall_exit_##_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_exit_##_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_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 -#undef TRACE_INCLUDE_FILE -#undef TRACE_SYSTEM -#define TRACE_SYSTEM syscall_exit_pointers -#define TRACE_INCLUDE_FILE syscalls_pointers -#include -#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 SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS -#undef TP_PROBE_CB -#undef _TRACE_SYSCALLS_INTEGERS_H -#undef _TRACE_SYSCALLS_POINTERS_H - - -/* Hijack probe callback for compat system call exit */ -#define TP_PROBE_CB(_template) &syscall_exit_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), \ - 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_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 -#undef TRACE_INCLUDE_FILE -#undef TRACE_SYSTEM -#define TRACE_SYSTEM compat_syscall_exit_pointers -#define TRACE_INCLUDE_FILE compat_syscalls_pointers -#include -#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 SC_LTTNG_TRACEPOINT_EVENT_INSTANCE_NOARGS -#undef TP_PROBE_CB -#undef _TRACE_SYSCALLS_INTEGERS_H -#undef _TRACE_SYSCALLS_POINTERS_H -#undef LTTNG_SC_COMPAT - -#undef SC_EXIT - -#undef TP_MODULE_NOINIT -#undef LTTNG_PACKAGE_BUILD -#undef CREATE_TRACE_POINTS - -struct trace_syscall_entry { - void *func; - const struct lttng_event_desc *desc; - const struct lttng_event_field *fields; - unsigned int nrargs; -}; - -#define CREATE_SYSCALL_TABLE - -#define SC_ENTER - -#undef sc_exit -#define sc_exit(...) - -#undef TRACE_SYSCALL_TABLE -#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ - [ _nr ] = { \ - .func = __event_probe__syscall_entry_##_template, \ - .nrargs = (_nrargs), \ - .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 -#include -}; - -#undef TRACE_SYSCALL_TABLE -#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ - [ _nr ] = { \ - .func = __event_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 */ -const struct trace_syscall_entry compat_sc_table[] = { -#include -#include -}; - -#undef SC_ENTER - -#define SC_EXIT - -#undef sc_exit -#define sc_exit(...) __VA_ARGS__ - -#undef TRACE_SYSCALL_TABLE -#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ - [ _nr ] = { \ - .func = __event_probe__syscall_exit_##_template, \ - .nrargs = (_nrargs), \ - .fields = __event_fields___syscall_exit_##_template, \ - .desc = &__event_desc___syscall_exit_##_name, \ - }, - -/* Syscall exit table */ -static const struct trace_syscall_entry sc_exit_table[] = { -#include -#include -}; - -#undef TRACE_SYSCALL_TABLE -#define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs) \ - [ _nr ] = { \ - .func = __event_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 */ -const struct trace_syscall_entry compat_sc_exit_table[] = { -#include -#include -}; - -#undef SC_EXIT - -#undef CREATE_SYSCALL_TABLE - -struct lttng_syscall_filter { - DECLARE_BITMAP(sc, NR_syscalls); - DECLARE_BITMAP(sc_compat, NR_compat_syscalls); -}; - -static void syscall_entry_unknown(struct lttng_event *event, - struct pt_regs *regs, unsigned int id) -{ - unsigned long args[LTTNG_SYSCALL_NR_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_entry_unknown(event, id, args); -} - -void syscall_entry_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; - - 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; - } - 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; - } - entry = &table[id]; - WARN_ON_ONCE(!entry); - - switch (entry->nrargs) { - case 0: - { - void (*fptr)(void *__data) = entry->func; - - fptr(event); - break; - } - case 1: - { - void (*fptr)(void *__data, unsigned long arg0) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, args[0]); - break; - } - case 2: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, args[0], args[1]); - break; - } - case 3: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, 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) = entry->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]); - break; - } - case 5: - { - void (*fptr)(void *__data, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2, - unsigned long arg3, - unsigned long arg4) = entry->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]); - 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) = entry->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], args[5]); - break; - } - default: - break; - } -} - -static void syscall_exit_unknown(struct lttng_event *event, - struct pt_regs *regs, int id, long ret) -{ - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - if (unlikely(in_compat_syscall())) - __event_probe__compat_syscall_exit_unknown(event, id, ret, - args); - else - __event_probe__syscall_exit_unknown(event, id, ret, args); -} - -void syscall_exit_probe(void *__data, struct pt_regs *regs, long ret) -{ - struct lttng_channel *chan = __data; - struct lttng_event *event, *unknown_event; - const struct trace_syscall_entry *table, *entry; - size_t table_len; - long id; - - 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; - } - } - 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; - } - } - 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); - return; - } - if (unlikely(in_compat_syscall())) - event = chan->compat_sc_exit_table[id]; - else - event = chan->sc_exit_table[id]; - if (unlikely(!event)) { - syscall_exit_unknown(unknown_event, regs, id, ret); - return; - } - entry = &table[id]; - WARN_ON_ONCE(!entry); - - switch (entry->nrargs) { - case 0: - { - void (*fptr)(void *__data, long ret) = entry->func; - - fptr(event, ret); - break; - } - case 1: - { - void (*fptr)(void *__data, - long ret, - unsigned long arg0) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, ret, args[0]); - break; - } - case 2: - { - void (*fptr)(void *__data, - long ret, - unsigned long arg0, - unsigned long arg1) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, ret, args[0], args[1]); - break; - } - case 3: - { - void (*fptr)(void *__data, - long ret, - unsigned long arg0, - unsigned long arg1, - unsigned long arg2) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, 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) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, 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) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, 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) = entry->func; - unsigned long args[LTTNG_SYSCALL_NR_ARGS]; - - lttng_syscall_get_arguments(current, regs, args); - fptr(event, ret, args[0], args[1], args[2], - args[3], args[4], args[5]); - break; - } - default: - break; - } -} - -/* - * 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) -{ - 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: - 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]); - } - } - 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(); - - 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; - } - - -#ifdef CONFIG_COMPAT - if (!chan->compat_sc_table) { - /* create syscall table mapping compat syscall to events */ - chan->compat_sc_table = kzalloc(sizeof(struct lttng_event *) - * ARRAY_SIZE(compat_sc_table), GFP_KERNEL); - if (!chan->compat_sc_table) - return -ENOMEM; - } - - if (!chan->compat_sc_exit_table) { - /* create syscall table mapping compat syscall to events */ - chan->compat_sc_exit_table = kzalloc(sizeof(struct lttng_event *) - * ARRAY_SIZE(compat_sc_exit_table), GFP_KERNEL); - if (!chan->compat_sc_exit_table) - return -ENOMEM; - } -#endif - if (!chan->sc_unknown) { - const struct lttng_event_desc *desc = - &__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_SYSCALL; - 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_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_SYSCALL; - 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); - } - } - - if (!chan->compat_sc_exit_unknown) { - const struct lttng_event_desc *desc = - &__event_desc___compat_syscall_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_SYSCALL; - 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); - } - } - - if (!chan->sc_exit_unknown) { - const struct lttng_event_desc *desc = - &__event_desc___syscall_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_SYSCALL; - 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); - } - } - - ret = fill_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), - 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), - 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), - chan->compat_sc_exit_table, chan, filter, - SC_TYPE_COMPAT_EXIT); - if (ret) - return ret; -#endif - if (!chan->sys_enter_registered) { - ret = lttng_wrapper_tracepoint_probe_register("sys_enter", - (void *) syscall_entry_probe, chan); - if (ret) - return ret; - chan->sys_enter_registered = 1; - } - /* - * We change the name of sys_exit tracepoint due to namespace - * conflict with sys_exit syscall entry. - */ - if (!chan->sys_exit_registered) { - ret = lttng_wrapper_tracepoint_probe_register("sys_exit", - (void *) syscall_exit_probe, chan); - if (ret) { - WARN_ON_ONCE(lttng_wrapper_tracepoint_probe_unregister("sys_enter", - (void *) syscall_entry_probe, chan)); - return ret; - } - chan->sys_exit_registered = 1; - } - return ret; -} - -/* - * Only called at session destruction. - */ -int lttng_syscalls_unregister(struct lttng_channel *chan) -{ - int ret; - - if (!chan->sc_table) - return 0; - if (chan->sys_enter_registered) { - 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_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() */ - kfree(chan->sc_table); - kfree(chan->sc_exit_table); -#ifdef CONFIG_COMPAT - kfree(chan->compat_sc_table); - kfree(chan->compat_sc_exit_table); -#endif - kfree(chan->sc_filter); - return 0; -} - -static -int get_syscall_nr(const char *syscall_name) -{ - int syscall_nr = -1; - int i; - - for (i = 0; i < ARRAY_SIZE(sc_table); i++) { - const struct trace_syscall_entry *entry; - const char *it_name; - - entry = &sc_table[i]; - if (!entry->desc) - continue; - it_name = entry->desc->name; - it_name += strlen(SYSCALL_ENTRY_STR); - if (!strcmp(syscall_name, it_name)) { - syscall_nr = i; - break; - } - } - return syscall_nr; -} - -static -int get_compat_syscall_nr(const char *syscall_name) -{ - int syscall_nr = -1; - int i; - - for (i = 0; i < ARRAY_SIZE(compat_sc_table); i++) { - const struct trace_syscall_entry *entry; - const char *it_name; - - entry = &compat_sc_table[i]; - if (!entry->desc) - continue; - it_name = entry->desc->name; - it_name += strlen(COMPAT_SYSCALL_ENTRY_STR); - if (!strcmp(syscall_name, it_name)) { - syscall_nr = i; - break; - } - } - return syscall_nr; -} - -static -uint32_t get_sc_tables_len(void) -{ - return ARRAY_SIZE(sc_table) + ARRAY_SIZE(compat_sc_table); -} - -int lttng_syscall_filter_enable(struct lttng_channel *chan, - const char *name) -{ - int syscall_nr, compat_syscall_nr, ret; - struct lttng_syscall_filter *filter; - - 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); - } - chan->syscall_all = 1; - return 0; - } - - if (!chan->sc_filter) { - if (chan->syscall_all) { - /* - * All syscalls are already enabled. - */ - return -EEXIST; - } - 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; - } - 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; - } - bitmap_set(filter->sc_compat, compat_syscall_nr, 1); - } - if (!chan->sc_filter) - rcu_assign_pointer(chan->sc_filter, filter); - return 0; - -error: - if (!chan->sc_filter) - kfree(filter); - return ret; -} - -int lttng_syscall_filter_disable(struct lttng_channel *chan, - const char *name) -{ - int syscall_nr, compat_syscall_nr, ret; - struct lttng_syscall_filter *filter; - - WARN_ON_ONCE(!chan->sc_table); - - 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; - } - - 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; - } - - /* 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); - } - if (compat_syscall_nr >= 0) { - if (!test_bit(compat_syscall_nr, filter->sc_compat)) { - ret = -EEXIST; - goto error; - } - bitmap_clear(filter->sc_compat, compat_syscall_nr, 1); - } -apply_filter: - if (!chan->sc_filter) - rcu_assign_pointer(chan->sc_filter, filter); - chan->syscall_all = 0; - return 0; - -error: - if (!chan->sc_filter) - kfree(filter); - return ret; -} - -static -const struct trace_syscall_entry *syscall_list_get_entry(loff_t *pos) -{ - const struct trace_syscall_entry *entry; - int iter = 0; - - for (entry = sc_table; - entry < sc_table + ARRAY_SIZE(sc_table); - entry++) { - if (iter++ >= *pos) - return entry; - } - for (entry = compat_sc_table; - entry < compat_sc_table + ARRAY_SIZE(compat_sc_table); - entry++) { - if (iter++ >= *pos) - return entry; - } - /* End of list */ - return NULL; -} - -static -void *syscall_list_start(struct seq_file *m, loff_t *pos) -{ - return (void *) syscall_list_get_entry(pos); -} - -static -void *syscall_list_next(struct seq_file *m, void *p, loff_t *ppos) -{ - (*ppos)++; - return (void *) syscall_list_get_entry(ppos); -} - -static -void syscall_list_stop(struct seq_file *m, void *p) -{ -} - -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; - - 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 { - index = (entry - table) + ARRAY_SIZE(sc_table); - name = &entry->desc->name[strlen(COMPAT_SYSCALL_ENTRY_STR)]; - } - seq_printf(m, "syscall { index = %lu; name = %s; bitness = %u; };\n", - index, name, bitness); - return 0; -} - -static -const struct seq_operations lttng_syscall_list_seq_ops = { - .start = syscall_list_start, - .next = syscall_list_next, - .stop = syscall_list_stop, - .show = syscall_list_show, -}; - -static -int lttng_syscall_list_open(struct inode *inode, struct file *file) -{ - return seq_open(file, <tng_syscall_list_seq_ops); -} - -const struct file_operations lttng_syscall_list_fops = { - .owner = THIS_MODULE, - .open = lttng_syscall_list_open, - .read = seq_read, - .llseek = seq_lseek, - .release = seq_release, -}; - -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 (filter) - state = test_bit(bit, filter->sc); - 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 (filter) - state = test_bit(bit - ARRAY_SIZE(sc_table), - filter->sc_compat); - 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; -}