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Linux kernel mirror (for testing)
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linux
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(__i386__)
22#include <asm/syscalls_32.c>
23const int syscalltbl_native_max_id = SYSCALLTBL_x86_MAX_ID;
24static const char *const *syscalltbl_native = syscalltbl_x86;
25#elif defined(__s390x__)
26#include <asm/syscalls_64.c>
27const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
28static const char *const *syscalltbl_native = syscalltbl_s390_64;
29#elif defined(__powerpc64__)
30#include <asm/syscalls_64.c>
31const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
32static const char *const *syscalltbl_native = syscalltbl_powerpc_64;
33#elif defined(__powerpc__)
34#include <asm/syscalls_32.c>
35const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
36static const char *const *syscalltbl_native = syscalltbl_powerpc_32;
37#elif defined(__aarch64__)
38#include <asm/syscalls.c>
39const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID;
40static const char *const *syscalltbl_native = syscalltbl_arm64;
41#elif defined(__mips__)
42#include <asm/syscalls_n64.c>
43const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID;
44static const char *const *syscalltbl_native = syscalltbl_mips_n64;
45#elif defined(__loongarch__)
46#include <asm/syscalls.c>
47const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID;
48static const char *const *syscalltbl_native = syscalltbl_loongarch;
49#endif
50
51struct syscall {
52 int id;
53 const char *name;
54};
55
56static int syscallcmpname(const void *vkey, const void *ventry)
57{
58 const char *key = vkey;
59 const struct syscall *entry = ventry;
60
61 return strcmp(key, entry->name);
62}
63
64static int syscallcmp(const void *va, const void *vb)
65{
66 const struct syscall *a = va, *b = vb;
67
68 return strcmp(a->name, b->name);
69}
70
71static int syscalltbl__init_native(struct syscalltbl *tbl)
72{
73 int nr_entries = 0, i, j;
74 struct syscall *entries;
75
76 for (i = 0; i <= syscalltbl_native_max_id; ++i)
77 if (syscalltbl_native[i])
78 ++nr_entries;
79
80 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
81 if (tbl->syscalls.entries == NULL)
82 return -1;
83
84 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
85 if (syscalltbl_native[i]) {
86 entries[j].name = syscalltbl_native[i];
87 entries[j].id = i;
88 ++j;
89 }
90 }
91
92 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
93 tbl->syscalls.nr_entries = nr_entries;
94 tbl->syscalls.max_id = syscalltbl_native_max_id;
95 return 0;
96}
97
98struct syscalltbl *syscalltbl__new(void)
99{
100 struct syscalltbl *tbl = malloc(sizeof(*tbl));
101 if (tbl) {
102 if (syscalltbl__init_native(tbl)) {
103 free(tbl);
104 return NULL;
105 }
106 }
107 return tbl;
108}
109
110void syscalltbl__delete(struct syscalltbl *tbl)
111{
112 zfree(&tbl->syscalls.entries);
113 free(tbl);
114}
115
116const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
117{
118 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
119}
120
121int syscalltbl__id(struct syscalltbl *tbl, const char *name)
122{
123 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
124 tbl->syscalls.nr_entries, sizeof(*sc),
125 syscallcmpname);
126
127 return sc ? sc->id : -1;
128}
129
130int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
131{
132 struct syscall *syscalls = tbl->syscalls.entries;
133
134 return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
135}
136
137int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
138{
139 int i;
140 struct syscall *syscalls = tbl->syscalls.entries;
141
142 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
143 if (strglobmatch(syscalls[i].name, syscall_glob)) {
144 *idx = i;
145 return syscalls[i].id;
146 }
147 }
148
149 return -1;
150}
151
152int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
153{
154 *idx = -1;
155 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
156}
157
158#else /* HAVE_SYSCALL_TABLE_SUPPORT */
159
160#include <libaudit.h>
161
162struct syscalltbl *syscalltbl__new(void)
163{
164 struct syscalltbl *tbl = zalloc(sizeof(*tbl));
165 if (tbl)
166 tbl->audit_machine = audit_detect_machine();
167 return tbl;
168}
169
170void syscalltbl__delete(struct syscalltbl *tbl)
171{
172 free(tbl);
173}
174
175const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
176{
177 return audit_syscall_to_name(id, tbl->audit_machine);
178}
179
180int syscalltbl__id(struct syscalltbl *tbl, const char *name)
181{
182 return audit_name_to_syscall(name, tbl->audit_machine);
183}
184
185int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
186 const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
187{
188 return -1;
189}
190
191int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
192{
193 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
194}
195#endif /* HAVE_SYSCALL_TABLE_SUPPORT */