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
12#ifdef HAVE_SYSCALL_TABLE_SUPPORT
13#include <linux/zalloc.h>
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 **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 **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 **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 **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 **syscalltbl_native = syscalltbl_arm64;
37#endif
38
39struct syscall {
40 int id;
41 const char *name;
42};
43
44static int syscallcmpname(const void *vkey, const void *ventry)
45{
46 const char *key = vkey;
47 const struct syscall *entry = ventry;
48
49 return strcmp(key, entry->name);
50}
51
52static int syscallcmp(const void *va, const void *vb)
53{
54 const struct syscall *a = va, *b = vb;
55
56 return strcmp(a->name, b->name);
57}
58
59static int syscalltbl__init_native(struct syscalltbl *tbl)
60{
61 int nr_entries = 0, i, j;
62 struct syscall *entries;
63
64 for (i = 0; i <= syscalltbl_native_max_id; ++i)
65 if (syscalltbl_native[i])
66 ++nr_entries;
67
68 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
69 if (tbl->syscalls.entries == NULL)
70 return -1;
71
72 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
73 if (syscalltbl_native[i]) {
74 entries[j].name = syscalltbl_native[i];
75 entries[j].id = i;
76 ++j;
77 }
78 }
79
80 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
81 tbl->syscalls.nr_entries = nr_entries;
82 tbl->syscalls.max_id = syscalltbl_native_max_id;
83 return 0;
84}
85
86struct syscalltbl *syscalltbl__new(void)
87{
88 struct syscalltbl *tbl = malloc(sizeof(*tbl));
89 if (tbl) {
90 if (syscalltbl__init_native(tbl)) {
91 free(tbl);
92 return NULL;
93 }
94 }
95 return tbl;
96}
97
98void syscalltbl__delete(struct syscalltbl *tbl)
99{
100 zfree(&tbl->syscalls.entries);
101 free(tbl);
102}
103
104const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
105{
106 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
107}
108
109int syscalltbl__id(struct syscalltbl *tbl, const char *name)
110{
111 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
112 tbl->syscalls.nr_entries, sizeof(*sc),
113 syscallcmpname);
114
115 return sc ? sc->id : -1;
116}
117
118int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
119{
120 int i;
121 struct syscall *syscalls = tbl->syscalls.entries;
122
123 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
124 if (strglobmatch(syscalls[i].name, syscall_glob)) {
125 *idx = i;
126 return syscalls[i].id;
127 }
128 }
129
130 return -1;
131}
132
133int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
134{
135 *idx = -1;
136 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
137}
138
139#else /* HAVE_SYSCALL_TABLE_SUPPORT */
140
141#include <libaudit.h>
142
143struct syscalltbl *syscalltbl__new(void)
144{
145 struct syscalltbl *tbl = malloc(sizeof(*tbl));
146 if (tbl)
147 tbl->audit_machine = audit_detect_machine();
148 return tbl;
149}
150
151void syscalltbl__delete(struct syscalltbl *tbl)
152{
153 free(tbl);
154}
155
156const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
157{
158 return audit_syscall_to_name(id, tbl->audit_machine);
159}
160
161int syscalltbl__id(struct syscalltbl *tbl, const char *name)
162{
163 return audit_name_to_syscall(name, tbl->audit_machine);
164}
165
166int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
167 const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
168{
169 return -1;
170}
171
172int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
173{
174 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
175}
176#endif /* HAVE_SYSCALL_TABLE_SUPPORT */