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 **syscalltbl_native = syscalltbl_x86_64; 21 #elif defined(__s390x__) 22 #include <asm/syscalls_64.c> 23 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID; 24 static const char **syscalltbl_native = syscalltbl_s390_64; 25 #elif defined(__powerpc64__) 26 #include <asm/syscalls_64.c> 27 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID; 28 static const char **syscalltbl_native = syscalltbl_powerpc_64; 29 #elif defined(__powerpc__) 30 #include <asm/syscalls_32.c> 31 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID; 32 static const char **syscalltbl_native = syscalltbl_powerpc_32; 33 #elif defined(__aarch64__) 34 #include <asm/syscalls.c> 35 const int syscalltbl_native_max_id = SYSCALLTBL_ARM64_MAX_ID; 36 static const char **syscalltbl_native = syscalltbl_arm64; 37 #elif defined(__mips__) 38 #include <asm/syscalls_n64.c> 39 const int syscalltbl_native_max_id = SYSCALLTBL_MIPS_N64_MAX_ID; 40 static const char **syscalltbl_native = syscalltbl_mips_n64; 41 #elif defined(__loongarch__) 42 #include <asm/syscalls.c> 43 const int syscalltbl_native_max_id = SYSCALLTBL_LOONGARCH_MAX_ID; 44 static const char **syscalltbl_native = syscalltbl_loongarch; 45 #endif 46 47 struct syscall { 48 int id; 49 const char *name; 50 }; 51 52 static int syscallcmpname(const void *vkey, const void *ventry) 53 { 54 const char *key = vkey; 55 const struct syscall *entry = ventry; 56 57 return strcmp(key, entry->name); 58 } 59 60 static int syscallcmp(const void *va, const void *vb) 61 { 62 const struct syscall *a = va, *b = vb; 63 64 return strcmp(a->name, b->name); 65 } 66 67 static int syscalltbl__init_native(struct syscalltbl *tbl) 68 { 69 int nr_entries = 0, i, j; 70 struct syscall *entries; 71 72 for (i = 0; i <= syscalltbl_native_max_id; ++i) 73 if (syscalltbl_native[i]) 74 ++nr_entries; 75 76 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); 77 if (tbl->syscalls.entries == NULL) 78 return -1; 79 80 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { 81 if (syscalltbl_native[i]) { 82 entries[j].name = syscalltbl_native[i]; 83 entries[j].id = i; 84 ++j; 85 } 86 } 87 88 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); 89 tbl->syscalls.nr_entries = nr_entries; 90 tbl->syscalls.max_id = syscalltbl_native_max_id; 91 return 0; 92 } 93 94 struct syscalltbl *syscalltbl__new(void) 95 { 96 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 97 if (tbl) { 98 if (syscalltbl__init_native(tbl)) { 99 free(tbl); 100 return NULL; 101 } 102 } 103 return tbl; 104 } 105 106 void syscalltbl__delete(struct syscalltbl *tbl) 107 { 108 zfree(&tbl->syscalls.entries); 109 free(tbl); 110 } 111 112 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 113 { 114 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 115 } 116 117 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 118 { 119 struct syscall *sc = bsearch(name, tbl->syscalls.entries, 120 tbl->syscalls.nr_entries, sizeof(*sc), 121 syscallcmpname); 122 123 return sc ? sc->id : -1; 124 } 125 126 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 127 { 128 int i; 129 struct syscall *syscalls = tbl->syscalls.entries; 130 131 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { 132 if (strglobmatch(syscalls[i].name, syscall_glob)) { 133 *idx = i; 134 return syscalls[i].id; 135 } 136 } 137 138 return -1; 139 } 140 141 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 142 { 143 *idx = -1; 144 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 145 } 146 147 #else /* HAVE_SYSCALL_TABLE_SUPPORT */ 148 149 #include <libaudit.h> 150 151 struct syscalltbl *syscalltbl__new(void) 152 { 153 struct syscalltbl *tbl = zalloc(sizeof(*tbl)); 154 if (tbl) 155 tbl->audit_machine = audit_detect_machine(); 156 return tbl; 157 } 158 159 void syscalltbl__delete(struct syscalltbl *tbl) 160 { 161 free(tbl); 162 } 163 164 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 165 { 166 return audit_syscall_to_name(id, tbl->audit_machine); 167 } 168 169 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 170 { 171 return audit_name_to_syscall(name, tbl->audit_machine); 172 } 173 174 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 175 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 176 { 177 return -1; 178 } 179 180 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 181 { 182 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 183 } 184 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */ 185