Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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
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#endif
30
31struct syscall {
32 int id;
33 const char *name;
34};
35
36static int syscallcmpname(const void *vkey, const void *ventry)
37{
38 const char *key = vkey;
39 const struct syscall *entry = ventry;
40
41 return strcmp(key, entry->name);
42}
43
44static int syscallcmp(const void *va, const void *vb)
45{
46 const struct syscall *a = va, *b = vb;
47
48 return strcmp(a->name, b->name);
49}
50
51static int syscalltbl__init_native(struct syscalltbl *tbl)
52{
53 int nr_entries = 0, i, j;
54 struct syscall *entries;
55
56 for (i = 0; i <= syscalltbl_native_max_id; ++i)
57 if (syscalltbl_native[i])
58 ++nr_entries;
59
60 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
61 if (tbl->syscalls.entries == NULL)
62 return -1;
63
64 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
65 if (syscalltbl_native[i]) {
66 entries[j].name = syscalltbl_native[i];
67 entries[j].id = i;
68 ++j;
69 }
70 }
71
72 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
73 tbl->syscalls.nr_entries = nr_entries;
74 return 0;
75}
76
77struct syscalltbl *syscalltbl__new(void)
78{
79 struct syscalltbl *tbl = malloc(sizeof(*tbl));
80 if (tbl) {
81 if (syscalltbl__init_native(tbl)) {
82 free(tbl);
83 return NULL;
84 }
85 }
86 return tbl;
87}
88
89void syscalltbl__delete(struct syscalltbl *tbl)
90{
91 zfree(&tbl->syscalls.entries);
92 free(tbl);
93}
94
95const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
96{
97 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
98}
99
100int syscalltbl__id(struct syscalltbl *tbl, const char *name)
101{
102 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
103 tbl->syscalls.nr_entries, sizeof(*sc),
104 syscallcmpname);
105
106 return sc ? sc->id : -1;
107}
108
109int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
110{
111 int i;
112 struct syscall *syscalls = tbl->syscalls.entries;
113
114 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
115 if (strglobmatch(syscalls[i].name, syscall_glob)) {
116 *idx = i;
117 return syscalls[i].id;
118 }
119 }
120
121 return -1;
122}
123
124int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
125{
126 *idx = -1;
127 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
128}
129
130#else /* HAVE_SYSCALL_TABLE */
131
132#include <libaudit.h>
133
134struct syscalltbl *syscalltbl__new(void)
135{
136 struct syscalltbl *tbl = malloc(sizeof(*tbl));
137 if (tbl)
138 tbl->audit_machine = audit_detect_machine();
139 return tbl;
140}
141
142void syscalltbl__delete(struct syscalltbl *tbl)
143{
144 free(tbl);
145}
146
147const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
148{
149 return audit_syscall_to_name(id, tbl->audit_machine);
150}
151
152int syscalltbl__id(struct syscalltbl *tbl, const char *name)
153{
154 return audit_name_to_syscall(name, tbl->audit_machine);
155}
156
157int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
158 const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
159{
160 return -1;
161}
162
163int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
164{
165 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
166}
167#endif /* HAVE_SYSCALL_TABLE */