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#elif defined(__riscv)
 50#include <asm/syscalls.c>
 51const int syscalltbl_native_max_id = SYSCALLTBL_RISCV_MAX_ID;
 52static const char *const *syscalltbl_native = syscalltbl_riscv;
 53#else
 54const int syscalltbl_native_max_id = 0;
 55static const char *const syscalltbl_native[] = {
 56	[0] = "unknown",
 57};
 58#endif
 59
 60struct syscall {
 61	int id;
 62	const char *name;
 63};
 64
 65static int syscallcmpname(const void *vkey, const void *ventry)
 66{
 67	const char *key = vkey;
 68	const struct syscall *entry = ventry;
 69
 70	return strcmp(key, entry->name);
 71}
 72
 73static int syscallcmp(const void *va, const void *vb)
 74{
 75	const struct syscall *a = va, *b = vb;
 76
 77	return strcmp(a->name, b->name);
 78}
 79
 80static int syscalltbl__init_native(struct syscalltbl *tbl)
 81{
 82	int nr_entries = 0, i, j;
 83	struct syscall *entries;
 84
 85	for (i = 0; i <= syscalltbl_native_max_id; ++i)
 86		if (syscalltbl_native[i])
 87			++nr_entries;
 88
 89	entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);
 90	if (tbl->syscalls.entries == NULL)
 91		return -1;
 92
 93	for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {
 94		if (syscalltbl_native[i]) {
 95			entries[j].name = syscalltbl_native[i];
 96			entries[j].id = i;
 97			++j;
 98		}
 99	}
100
101	qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);
102	tbl->syscalls.nr_entries = nr_entries;
103	tbl->syscalls.max_id	 = syscalltbl_native_max_id;
104	return 0;
105}
106
107struct syscalltbl *syscalltbl__new(void)
108{
109	struct syscalltbl *tbl = malloc(sizeof(*tbl));
110	if (tbl) {
111		if (syscalltbl__init_native(tbl)) {
112			free(tbl);
113			return NULL;
114		}
115	}
116	return tbl;
117}
118
119void syscalltbl__delete(struct syscalltbl *tbl)
120{
121	zfree(&tbl->syscalls.entries);
122	free(tbl);
123}
124
125const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)
126{
127	return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;
128}
129
130int syscalltbl__id(struct syscalltbl *tbl, const char *name)
131{
132	struct syscall *sc = bsearch(name, tbl->syscalls.entries,
133				     tbl->syscalls.nr_entries, sizeof(*sc),
134				     syscallcmpname);
135
136	return sc ? sc->id : -1;
137}
138
139int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)
140{
141	struct syscall *syscalls = tbl->syscalls.entries;
142
143	return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;
144}
145
146int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
147{
148	int i;
149	struct syscall *syscalls = tbl->syscalls.entries;
150
151	for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {
152		if (strglobmatch(syscalls[i].name, syscall_glob)) {
153			*idx = i;
154			return syscalls[i].id;
155		}
156	}
157
158	return -1;
159}
160
161int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
162{
163	*idx = -1;
164	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
165}
166
167#else /* HAVE_SYSCALL_TABLE_SUPPORT */
168
169#include <libaudit.h>
170
171struct syscalltbl *syscalltbl__new(void)
172{
173	struct syscalltbl *tbl = zalloc(sizeof(*tbl));
174	if (tbl)
175		tbl->audit_machine = audit_detect_machine();
176	return tbl;
177}
178
179void syscalltbl__delete(struct syscalltbl *tbl)
180{
181	free(tbl);
182}
183
184const char *syscalltbl__name(const struct syscalltbl *tbl, int id)
185{
186	return audit_syscall_to_name(id, tbl->audit_machine);
187}
188
189int syscalltbl__id(struct syscalltbl *tbl, const char *name)
190{
191	return audit_name_to_syscall(name, tbl->audit_machine);
192}
193
194int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx)
195{
196	return idx;
197}
198
199int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,
200				  const char *syscall_glob __maybe_unused, int *idx __maybe_unused)
201{
202	return -1;
203}
204
205int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)
206{
207	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);
208}
209#endif /* HAVE_SYSCALL_TABLE_SUPPORT */