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> 19 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID; 20 static const char *const *syscalltbl_native = syscalltbl_x86_64; 21 #elif defined(__i386__) 22 #include <asm/syscalls_32.c> 23 const int syscalltbl_native_max_id = SYSCALLTBL_x86_MAX_ID; 24 static const char *const *syscalltbl_native = syscalltbl_x86; 25 #elif defined(__s390x__) 26 #include <asm/syscalls_64.c> 27 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID; 28 static const char *const *syscalltbl_native = syscalltbl_s390_64; 29 #elif defined(__powerpc64__) 30 #include <asm/syscalls_64.c> 31 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID; 32 static const char *const *syscalltbl_native = syscalltbl_powerpc_64; 33 #elif defined(__powerpc__) 34 #include <asm/syscalls_32.c> 35 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID; 36 static const char *const *syscalltbl_native = syscalltbl_powerpc_32; 37 #elif defined(__aarch64__) 38 #include <asm/syscalls.c> 39 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID; 40 static const char *const *syscalltbl_native = syscalltbl_arm64; 41 #elif defined(__mips__) 42 #include <asm/syscalls_n64.c> 43 const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID; 44 static const char *const *syscalltbl_native = syscalltbl_mips_n64; 45 #elif defined(__loongarch__) 46 #include <asm/syscalls.c> 47 const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID; 48 static const char *const *syscalltbl_native = syscalltbl_loongarch; 49 #elif defined(__riscv) 50 #include <asm/syscalls.c> 51 const int syscalltbl_native_max_id = SYSCALLTBL_RISCV_MAX_ID; 52 static const char *const *syscalltbl_native = syscalltbl_riscv; 53 #else 54 const int syscalltbl_native_max_id = 0; 55 static const char *const syscalltbl_native[] = { 56 [0] = "unknown", 57 }; 58 #endif 59 60 struct syscall { 61 int id; 62 const char *name; 63 }; 64 65 static 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 73 static 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 80 static 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 } 106 107 struct 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 } 118 119 void syscalltbl__delete(struct syscalltbl *tbl) 120 { 121 zfree(&tbl->syscalls.entries); 122 free(tbl); 123 } 124 125 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 126 { 127 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 128 } 129 130 int 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 } 138 139 int 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 } 145 146 int 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 } 160 161 int 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> 170 171 struct 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 } 178 179 void syscalltbl__delete(struct syscalltbl *tbl) 180 { 181 free(tbl); 182 } 183 184 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 185 { 186 return audit_syscall_to_name(id, tbl->audit_machine); 187 } 188 189 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 190 { 191 return audit_name_to_syscall(name, tbl->audit_machine); 192 } 193 194 int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx) 195 { 196 return idx; 197 } 198 199 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 200 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 201 { 202 return -1; 203 } 204 205 int 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 */ 210