1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * System call table mapper
4 *
5 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
6 */
7
8#include "syscalltbl.h"
9#include <stdlib.h>
10#include <linux/compiler.h>
11#include <linux/zalloc.h>
12
13#ifdef HAVE_SYSCALL_TABLE_SUPPORT
14#include <string.h>
15#include "string2.h"
16
17#if defined(__x86_64__)
18#include <asm/syscalls_64.c>
19const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
20static const char *const *syscalltbl_native = syscalltbl_x86_64;
21#elif defined(__s390x__)
22#include <asm/syscalls_64.c>
23const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
24static const char *const *syscalltbl_native = syscalltbl_s390_64;
25#elif defined(__powerpc64__)
26#include <asm/syscalls_64.c>
27const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
28static const char *const *syscalltbl_native = syscalltbl_powerpc_64;
29#elif defined(__powerpc__)
30#include <asm/syscalls_32.c>
31const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
32static const char *const *syscalltbl_native = syscalltbl_powerpc_32;
33#elif defined(__aarch64__)
34#include <asm/syscalls.c>
35const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
36static const char *const *syscalltbl_native = syscalltbl_arm64;
37#elif defined(__mips__)
38#include <asm/syscalls_n64.c>
39const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
40static const char *const *syscalltbl_native = syscalltbl_mips_n64;
41#elif defined(__loongarch__)
42#include <asm/syscalls.c>
43const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
44static const char *const *syscalltbl_native = syscalltbl_loongarch;
45#endif
46
47struct syscall {
48	int id;
49	const char *name;
50};
51
52static int syscallcmpname(const void *vkey, const void *ventry)
53{
54	const char *key = vkey;
55	const struct syscall *entry = ventry;
56
57	return strcmp(key, entry->name);
58}
59
60static int syscallcmp(const void *va, const void *vb)
61{
62	const struct syscall *a = va, *b = vb;
63
64	return strcmp(a->name, b->name);
65}
66
67static int syscalltbl__init_native(struct syscalltbl *tbl)
68{
69	int nr_entries = 0, i, j;
70	struct syscall *entries;
71
72	for (i = 0; i <= syscalltbl_native_max_id; ++i)
73		if (syscalltbl_native[i])
74			++nr_entries;
75
76	entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
77	if (tbl->syscalls.entries == NULL)
78		return -1;
79
80	for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
81		if (syscalltbl_native[i]) {
82			entries[j].name = syscalltbl_native[i];
83			entries[j].id = i;
84			++j;
85		}
86	}
87
88	qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
89	tbl->syscalls.nr_entries = nr_entries;
90	tbl->syscalls.max_id	 = syscalltbl_native_max_id;
91	return 0;
92}
93
94struct syscalltbl *syscalltbl__new(void)
95{
96	struct syscalltbl *tbl = malloc(sizeof(*tbl));
97	if (tbl) {
98		if (syscalltbl__init_native(tbl)) {
99			free(tbl);
100			return NULL;
101		}
102	}
103	return tbl;
104}
105
106void syscalltbl__delete(struct syscalltbl *tbl)
107{
108	zfree(&tbl->syscalls.entries);
109	free(tbl);
110}
111
112const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
113{
114	return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
115}
116
117int syscalltbl__id(struct syscalltbl *tbl, const char *name)
118{
119	struct syscall *sc = bsearch(name, tbl->syscalls.entries,
120				     tbl->syscalls.nr_entries, sizeof(*sc),
121				     syscallcmpname);
122
123	return sc ? sc->id : -1;
124}
125
126int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
127{
128	int i;
129	struct syscall *syscalls = tbl->syscalls.entries;
130
131	for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
132		if (strglobmatch(syscalls[i].name, syscall_glob)) {
133			*idx = i;
134			return syscalls[i].id;
135		}
136	}
137
138	return -1;
139}
140
141int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
142{
143	*idx = -1;
144	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
145}
146
147#else /* HAVE_SYSCALL_TABLE_SUPPORT */
148
149#include <libaudit.h>
150
151struct syscalltbl *syscalltbl__new(void)
152{
153	struct syscalltbl *tbl = zalloc(sizeof(*tbl));
154	if (tbl)
155		tbl->audit_machine = audit_detect_machine();
156	return tbl;
157}
158
159void syscalltbl__delete(struct syscalltbl *tbl)
160{
161	free(tbl);
162}
163
164const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
165{
166	return audit_syscall_to_name(id, tbl->audit_machine);
167}
168
169int syscalltbl__id(struct syscalltbl *tbl, const char *name)
170{
171	return audit_name_to_syscall(name, tbl->audit_machine);
172}
173
174int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
175				  const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
176{
177	return -1;
178}
179
180int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
181{
182	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
183}
184#endif /* HAVE_SYSCALL_TABLE_SUPPORT */
185