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
19#ifdef HAVE_SYSCALL_TABLE
20#include <linux/compiler.h>
21#include <string.h>
22#include "util.h"
23
24#if defined(__x86_64__)
25#include <asm/syscalls_64.c>
26const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID;
27static const char **syscalltbl_native = syscalltbl_x86_64;
28#endif
29
30struct syscall {
31 int id;
32 const char *name;
33};
34
35static int syscallcmpname(const void *vkey, const void *ventry)
36{
37 const char *key = vkey;
38 const struct syscall *entry = ventry;
39
40 return strcmp(key, entry->name);
41}
42
43static int syscallcmp(const void *va, const void *vb)
44{
45 const struct syscall *a = va, *b = vb;
46
47 return strcmp(a->name, b->name);
48}
49
50static int syscalltbl__init_native(struct syscalltbl *tbl)
51{
52 int nr_entries = 0, i, j;
53 struct syscall *entries;
54
55 for (i = 0; i <= syscalltbl_native_max_id; ++i)
56 if (syscalltbl_native[i])
57 ++nr_entries;
58
59 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
60 if (tbl->syscalls.entries == NULL)
61 return -1;
62
63 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
64 if (syscalltbl_native[i]) {
65 entries[j].name = syscalltbl_native[i];
66 entries[j].id = i;
67 ++j;
68 }
69 }
70
71 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
72 tbl->syscalls.nr_entries = nr_entries;
73 return 0;
74}
75
76struct syscalltbl *syscalltbl__new(void)
77{
78 struct syscalltbl *tbl = malloc(sizeof(*tbl));
79 if (tbl) {
80 if (syscalltbl__init_native(tbl)) {
81 free(tbl);
82 return NULL;
83 }
84 }
85 return tbl;
86}
87
88void syscalltbl__delete(struct syscalltbl *tbl)
89{
90 zfree(&tbl->syscalls.entries);
91 free(tbl);
92}
93
94const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
95{
96 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
97}
98
99int syscalltbl__id(struct syscalltbl *tbl, const char *name)
100{
101 struct syscall *sc = bsearch(name, tbl->syscalls.entries,
102 tbl->syscalls.nr_entries, sizeof(*sc),
103 syscallcmpname);
104
105 return sc ? sc->id : -1;
106}
107
108#else /* HAVE_SYSCALL_TABLE */
109
110#include <libaudit.h>
111
112struct syscalltbl *syscalltbl__new(void)
113{
114 struct syscalltbl *tbl = malloc(sizeof(*tbl));
115 if (tbl)
116 tbl->audit_machine = audit_detect_machine();
117 return tbl;
118}
119
120void syscalltbl__delete(struct syscalltbl *tbl)
121{
122 free(tbl);
123}
124
125const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
126{
127 return audit_syscall_to_name(id, tbl->audit_machine);
128}
129
130int syscalltbl__id(struct syscalltbl *tbl, const char *name)
131{
132 return audit_name_to_syscall(name, tbl->audit_machine);
133}
134#endif /* HAVE_SYSCALL_TABLE */