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 #else 50 const int syscalltbl_native_max_id = 0; 51 static const char *const syscalltbl_native[] = { 52 [0] = "unknown", 53 }; 54 #endif 55 56 struct syscall { 57 int id; 58 const char *name; 59 }; 60 61 static 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 69 static 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 76 static 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 } 102 103 struct 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 } 114 115 void syscalltbl__delete(struct syscalltbl *tbl) 116 { 117 zfree(&tbl->syscalls.entries); 118 free(tbl); 119 } 120 121 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 122 { 123 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 124 } 125 126 int 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 } 134 135 int 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 } 141 142 int 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 } 156 157 int 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> 166 167 struct 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 } 174 175 void syscalltbl__delete(struct syscalltbl *tbl) 176 { 177 free(tbl); 178 } 179 180 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 181 { 182 return audit_syscall_to_name(id, tbl->audit_machine); 183 } 184 185 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 186 { 187 return audit_name_to_syscall(name, tbl->audit_machine); 188 } 189 190 int syscalltbl__id_at_idx(struct syscalltbl *tbl __maybe_unused, int idx) 191 { 192 return idx; 193 } 194 195 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 196 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 197 { 198 return -1; 199 } 200 201 int 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