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>
19 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
20 static const char *const *syscalltbl_native = syscalltbl_x86_64;
21 #elif defined(__s390x__)
22 #include <asm/syscalls_64.c>
23 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
24 static const char *const *syscalltbl_native = syscalltbl_s390_64;
25 #elif defined(__powerpc64__)
26 #include <asm/syscalls_64.c>
27 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
28 static const char *const *syscalltbl_native = syscalltbl_powerpc_64;
29 #elif defined(__powerpc__)
30 #include <asm/syscalls_32.c>
31 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
32 static const char *const *syscalltbl_native = syscalltbl_powerpc_32;
33 #elif defined(__aarch64__)
34 #include <asm/syscalls.c>
35 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
36 static const char *const *syscalltbl_native = syscalltbl_arm64;
37 #elif defined(__mips__)
38 #include <asm/syscalls_n64.c>
39 const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
40 static const char *const *syscalltbl_native = syscalltbl_mips_n64;
41 #elif defined(__loongarch__)
42 #include <asm/syscalls.c>
43 const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
44 static const char *const *syscalltbl_native = syscalltbl_loongarch;
45 #endif
46
47 struct syscall {
48 int id;
49 const char *name;
50 };
51
52 static 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
60 static 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
67 static 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
94 struct 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
106 void syscalltbl__delete(struct syscalltbl *tbl)
107 {
108 zfree(&tbl->syscalls.entries);
109 free(tbl);
110 }
111
112 const 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
117 int 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
126 int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
127 {
128 struct syscall *syscalls = tbl->syscalls.entries;
129
130 return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
131 }
132
133 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
134 {
135 int i;
136 struct syscall *syscalls = tbl->syscalls.entries;
137
138 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
139 if (strglobmatch(syscalls[i].name, syscall_glob)) {
140 *idx = i;
141 return syscalls[i].id;
142 }
143 }
144
145 return -1;
146 }
147
148 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
149 {
150 *idx = -1;
151 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
152 }
153
154 #else /* HAVE_SYSCALL_TABLE_SUPPORT */
155
156 #include <libaudit.h>
157
158 struct syscalltbl *syscalltbl__new(void)
159 {
160 struct syscalltbl *tbl = zalloc(sizeof(*tbl));
161 if (tbl)
162 tbl->audit_machine = audit_detect_machine();
163 return tbl;
164 }
165
166 void syscalltbl__delete(struct syscalltbl *tbl)
167 {
168 free(tbl);
169 }
170
171 const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
172 {
173 return audit_syscall_to_name(id, tbl->audit_machine);
174 }
175
176 int syscalltbl__id(struct syscalltbl *tbl, const char *name)
177 {
178 return audit_name_to_syscall(name, tbl->audit_machine);
179 }
180
181 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
182 const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
183 {
184 return -1;
185 }
186
187 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
188 {
189 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
190 }
191 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */
192
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