Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * System call table mapper
3 *
4 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 */
15
16#include "syscalltbl.h"
17#include <stdlib.h>
18#include <linux/compiler.h>
19
20#ifdef HAVE_SYSCALL_TABLE_SUPPORT
21#include <string.h>
22#include "string2.h"
23#include "util.h"
24
25#if defined(__x86_64__)
26#include <asm/syscalls_64.c>
27const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
28static const char **syscalltbl_native = syscalltbl_x86_64;
29#elif defined(__s390x__)
30#include <asm/syscalls_64.c>
31const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID;
32static const char **syscalltbl_native = syscalltbl_s390_64;
33#elif defined(__powerpc64__)
34#include <asm/syscalls_64.c>
35const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID;
36static const char **syscalltbl_native = syscalltbl_powerpc_64;
37#elif defined(__powerpc__)
38#include <asm/syscalls_32.c>
39const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID;
40static const char **syscalltbl_native = syscalltbl_powerpc_32;
41#endif
42
43struct syscall {
44 int id;
45 const char *name;
46};
47
48static int syscallcmpname(const void *vkey, const void *ventry)
49{
50 const char *key = vkey;
51 const struct syscall *entry = ventry;
52
53 return strcmp(key, entry->name);
54}
55
56static int syscallcmp(const void *va, const void *vb)
57{
58 const struct syscall *a = va, *b = vb;
59
60 return strcmp(a->name, b->name);
61}
62
63static int syscalltbl__init_native(struct syscalltbl *tbl)
64{
65 int nr_entries = 0, i, j;
66 struct syscall *entries;
67
68 for (i = 0; i <= syscalltbl_native_max_id; ++i)
69 if (syscalltbl_native[i])
70 ++nr_entries;
71
72 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
73 if (tbl->syscalls.entries == NULL)
74 return -1;
75
76 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
77 if (syscalltbl_native[i]) {
78 entries[j].name = syscalltbl_native[i];
79 entries[j].id = i;
80 ++j;
81 }
82 }
83
84 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
85 tbl->syscalls.nr_entries = nr_entries;
86 return 0;
87}
88
89struct syscalltbl *syscalltbl__new(void)
90{
91 struct syscalltbl *tbl = malloc(sizeof(*tbl));
92 if (tbl) {
93 if (syscalltbl__init_native(tbl)) {
94 free(tbl);
95 return NULL;
96 }
97 }
98 return tbl;
99}
100
101void syscalltbl__delete(struct syscalltbl *tbl)
102{
103 zfree(&tbl->syscalls.entries);
104 free(tbl);
105}
106
107const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
108{
109 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
110}
111
112int syscalltbl__id(struct syscalltbl *tbl, const char *name)
113{
114 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
115 tbl->syscalls.nr_entries, sizeof(*sc),
116 syscallcmpname);
117
118 return sc ? sc->id : -1;
119}
120
121int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
122{
123 int i;
124 struct syscall *syscalls = tbl->syscalls.entries;
125
126 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
127 if (strglobmatch(syscalls[i].name, syscall_glob)) {
128 *idx = i;
129 return syscalls[i].id;
130 }
131 }
132
133 return -1;
134}
135
136int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
137{
138 *idx = -1;
139 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
140}
141
142#else /* HAVE_SYSCALL_TABLE_SUPPORT */
143
144#include <libaudit.h>
145
146struct syscalltbl *syscalltbl__new(void)
147{
148 struct syscalltbl *tbl = malloc(sizeof(*tbl));
149 if (tbl)
150 tbl->audit_machine = audit_detect_machine();
151 return tbl;
152}
153
154void syscalltbl__delete(struct syscalltbl *tbl)
155{
156 free(tbl);
157}
158
159const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
160{
161 return audit_syscall_to_name(id, tbl->audit_machine);
162}
163
164int syscalltbl__id(struct syscalltbl *tbl, const char *name)
165{
166 return audit_name_to_syscall(name, tbl->audit_machine);
167}
168
169int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
170 const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
171{
172 return -1;
173}
174
175int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
176{
177 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
178}
179#endif /* HAVE_SYSCALL_TABLE_SUPPORT */