1 /* 2 * System call table mapper 3 * 4 * (C) 2016 Arnaldo Carvalho de Melo <acme@redhat.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 */ 15 16 #include "syscalltbl.h" 17 #include <stdlib.h> 18 #include <linux/compiler.h> 19 20 #ifdef HAVE_SYSCALL_TABLE_SUPPORT 21 #include <string.h> 22 #include "string2.h" 23 #include "util.h" 24 25 #if defined(__x86_64__) 26 #include <asm/syscalls_64.c> 27 const int syscalltbl_native_max_id = SYSCALLTBL_x86_64_MAX_ID; 28 static const char **syscalltbl_native = syscalltbl_x86_64; 29 #elif defined(__s390x__) 30 #include <asm/syscalls_64.c> 31 const int syscalltbl_native_max_id = SYSCALLTBL_S390_64_MAX_ID; 32 static const char **syscalltbl_native = syscalltbl_s390_64; 33 #elif defined(__powerpc64__) 34 #include <asm/syscalls_64.c> 35 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_64_MAX_ID; 36 static const char **syscalltbl_native = syscalltbl_powerpc_64; 37 #elif defined(__powerpc__) 38 #include <asm/syscalls_32.c> 39 const int syscalltbl_native_max_id = SYSCALLTBL_POWERPC_32_MAX_ID; 40 static const char **syscalltbl_native = syscalltbl_powerpc_32; 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 return 0; 87 } 88 89 struct syscalltbl *syscalltbl__new(void) 90 { 91 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 92 if (tbl) { 93 if (syscalltbl__init_native(tbl)) { 94 free(tbl); 95 return NULL; 96 } 97 } 98 return tbl; 99 } 100 101 void syscalltbl__delete(struct syscalltbl *tbl) 102 { 103 zfree(&tbl->syscalls.entries); 104 free(tbl); 105 } 106 107 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 108 { 109 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 110 } 111 112 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 113 { 114 struct syscall *sc = bsearch(name, tbl->syscalls.entries, 115 tbl->syscalls.nr_entries, sizeof(*sc), 116 syscallcmpname); 117 118 return sc ? sc->id : -1; 119 } 120 121 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 122 { 123 int i; 124 struct syscall *syscalls = tbl->syscalls.entries; 125 126 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { 127 if (strglobmatch(syscalls[i].name, syscall_glob)) { 128 *idx = i; 129 return syscalls[i].id; 130 } 131 } 132 133 return -1; 134 } 135 136 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 137 { 138 *idx = -1; 139 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 140 } 141 142 #else /* HAVE_SYSCALL_TABLE_SUPPORT */ 143 144 #include <libaudit.h> 145 146 struct syscalltbl *syscalltbl__new(void) 147 { 148 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 149 if (tbl) 150 tbl->audit_machine = audit_detect_machine(); 151 return tbl; 152 } 153 154 void syscalltbl__delete(struct syscalltbl *tbl) 155 { 156 free(tbl); 157 } 158 159 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 160 { 161 return audit_syscall_to_name(id, tbl->audit_machine); 162 } 163 164 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 165 { 166 return audit_name_to_syscall(name, tbl->audit_machine); 167 } 168 169 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 170 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 171 { 172 return -1; 173 } 174 175 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 176 { 177 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 178 } 179 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */ 180