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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * System call table mapper4 *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_SUPPORT14#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#else50const int syscalltbl_native_max_id = 0;51static const char *const syscalltbl_native[] = {52	[0] = "unknown",53};54#endif55 56struct syscall {57	int id;58	const char *name;59};60 61static int syscallcmpname(const void *vkey, const void *ventry)62{63	const char *key = vkey;64	const struct syscall *entry = ventry;65 66	return strcmp(key, entry->name);67}68 69static int syscallcmp(const void *va, const void *vb)70{71	const struct syscall *a = va, *b = vb;72 73	return strcmp(a->name, b->name);74}75 76static int syscalltbl__init_native(struct syscalltbl *tbl)77{78	int nr_entries = 0, i, j;79	struct syscall *entries;80 81	for (i = 0; i <= syscalltbl_native_max_id; ++i)82		if (syscalltbl_native[i])83			++nr_entries;84 85	entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries);86	if (tbl->syscalls.entries == NULL)87		return -1;88 89	for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) {90		if (syscalltbl_native[i]) {91			entries[j].name = syscalltbl_native[i];92			entries[j].id = i;93			++j;94		}95	}96 97	qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp);98	tbl->syscalls.nr_entries = nr_entries;99	tbl->syscalls.max_id	 = syscalltbl_native_max_id;100	return 0;101}102 103struct syscalltbl *syscalltbl__new(void)104{105	struct syscalltbl *tbl = malloc(sizeof(*tbl));106	if (tbl) {107		if (syscalltbl__init_native(tbl)) {108			free(tbl);109			return NULL;110		}111	}112	return tbl;113}114 115void syscalltbl__delete(struct syscalltbl *tbl)116{117	zfree(&tbl->syscalls.entries);118	free(tbl);119}120 121const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id)122{123	return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL;124}125 126int syscalltbl__id(struct syscalltbl *tbl, const char *name)127{128	struct syscall *sc = bsearch(name, tbl->syscalls.entries,129				     tbl->syscalls.nr_entries, sizeof(*sc),130				     syscallcmpname);131 132	return sc ? sc->id : -1;133}134 135int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx)136{137	struct syscall *syscalls = tbl->syscalls.entries;138 139	return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1;140}141 142int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx)143{144	int i;145	struct syscall *syscalls = tbl->syscalls.entries;146 147	for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) {148		if (strglobmatch(syscalls[i].name, syscall_glob)) {149			*idx = i;150			return syscalls[i].id;151		}152	}153 154	return -1;155}156 157int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)158{159	*idx = -1;160	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);161}162 163#else /* HAVE_SYSCALL_TABLE_SUPPORT */164 165#include <libaudit.h>166 167struct syscalltbl *syscalltbl__new(void)168{169	struct syscalltbl *tbl = zalloc(sizeof(*tbl));170	if (tbl)171		tbl->audit_machine = audit_detect_machine();172	return tbl;173}174 175void syscalltbl__delete(struct syscalltbl *tbl)176{177	free(tbl);178}179 180const char *syscalltbl__name(const struct syscalltbl *tbl, int id)181{182	return audit_syscall_to_name(id, tbl->audit_machine);183}184 185int syscalltbl__id(struct syscalltbl *tbl, const char *name)186{187	return audit_name_to_syscall(name, tbl->audit_machine);188}189 190int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx)191{192	return idx;193}194 195int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused,196				  const char *syscall_glob __maybe_unused, int *idx __maybe_unused)197{198	return -1;199}200 201int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx)202{203	return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx);204}205#endif /* HAVE_SYSCALL_TABLE_SUPPORT */206