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(__s390x__) 18 #include <asm/syscalls_64.c> 19 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID; 20 static const char *const *syscalltbl_native = syscalltbl_s390_64; 21 #elif defined(__powerpc64__) 22 #include <asm/syscalls_64.c> 23 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID; 24 static const char *const *syscalltbl_native = syscalltbl_powerpc_64; 25 #elif defined(__powerpc__) 26 #include <asm/syscalls_32.c> 27 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID; 28 static const char *const *syscalltbl_native = syscalltbl_powerpc_32; 29 #elif defined(__aarch64__) 30 #include <asm/syscalls.c> 31 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID; 32 static const char *const *syscalltbl_native = syscalltbl_arm64; 33 #elif defined(__mips__) 34 #include <asm/syscalls_n64.c> 35 const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID; 36 static const char *const *syscalltbl_native = syscalltbl_mips_n64; 37 #elif defined(__loongarch__) 38 #include <asm/syscalls.c> 39 const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID; 40 static const char *const *syscalltbl_native = syscalltbl_loongarch; 41 #elif defined(GENERIC_SYSCALL_TABLE) 42 #include <syscall_table.h> 43 const int syscalltbl_native_max_id = SYSCALLTBL_MAX_ID; 44 static const char *const *syscalltbl_native = syscalltbl; 45 #else 46 const int syscalltbl_native_max_id = 0; 47 static const char *const syscalltbl_native[] = { 48 [0] = "unknown", 49 }; 50 #endif 51 52 struct syscall { 53 int id; 54 const char *name; 55 }; 56 57 static int syscallcmpname(const void *vkey, const void *ventry) 58 { 59 const char *key = vkey; 60 const struct syscall *entry = ventry; 61 62 return strcmp(key, entry->name); 63 } 64 65 static int syscallcmp(const void *va, const void *vb) 66 { 67 const struct syscall *a = va, *b = vb; 68 69 return strcmp(a->name, b->name); 70 } 71 72 static int syscalltbl__init_native(struct syscalltbl *tbl) 73 { 74 int nr_entries = 0, i, j; 75 struct syscall *entries; 76 77 for (i = 0; i <= syscalltbl_native_max_id; ++i) 78 if (syscalltbl_native[i]) 79 ++nr_entries; 80 81 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); 82 if (tbl->syscalls.entries == NULL) 83 return -1; 84 85 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { 86 if (syscalltbl_native[i]) { 87 entries[j].name = syscalltbl_native[i]; 88 entries[j].id = i; 89 ++j; 90 } 91 } 92 93 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); 94 tbl->syscalls.nr_entries = nr_entries; 95 tbl->syscalls.max_id = syscalltbl_native_max_id; 96 return 0; 97 } 98 99 struct syscalltbl *syscalltbl__new(void) 100 { 101 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 102 if (tbl) { 103 if (syscalltbl__init_native(tbl)) { 104 free(tbl); 105 return NULL; 106 } 107 } 108 return tbl; 109 } 110 111 void syscalltbl__delete(struct syscalltbl *tbl) 112 { 113 zfree(&tbl->syscalls.entries); 114 free(tbl); 115 } 116 117 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 118 { 119 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 120 } 121 122 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 123 { 124 struct syscall *sc = bsearch(name, tbl->syscalls.entries, 125 tbl->syscalls.nr_entries, sizeof(*sc), 126 syscallcmpname); 127 128 return sc ? sc->id : -1; 129 } 130 131 int syscalltbl__id_at_idx(struct syscalltbl *tbl, int idx) 132 { 133 struct syscall *syscalls = tbl->syscalls.entries; 134 135 return idx < tbl->syscalls.nr_entries ? syscalls[idx].id : -1; 136 } 137 138 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 139 { 140 int i; 141 struct syscall *syscalls = tbl->syscalls.entries; 142 143 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { 144 if (strglobmatch(syscalls[i].name, syscall_glob)) { 145 *idx = i; 146 return syscalls[i].id; 147 } 148 } 149 150 return -1; 151 } 152 153 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 154 { 155 *idx = -1; 156 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 157 } 158 159 #else /* HAVE_SYSCALL_TABLE_SUPPORT */ 160 161 #include <libaudit.h> 162 163 struct syscalltbl *syscalltbl__new(void) 164 { 165 struct syscalltbl *tbl = zalloc(sizeof(*tbl)); 166 if (tbl) 167 tbl->audit_machine = audit_detect_machine(); 168 return tbl; 169 } 170 171 void syscalltbl__delete(struct syscalltbl *tbl) 172 { 173 free(tbl); 174 } 175 176 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 177 { 178 return audit_syscall_to_name(id, tbl->audit_machine); 179 } 180 181 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 182 { 183 return audit_name_to_syscall(name, tbl->audit_machine); 184 } 185 186 int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx) 187 { 188 return idx; 189 } 190 191 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 192 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 193 { 194 return -1; 195 } 196 197 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 198 { 199 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 200 } 201 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */ 202