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