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 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 #endif 34 35 struct syscall { 36 int id; 37 const char *name; 38 }; 39 40 static int syscallcmpname(const void *vkey, const void *ventry) 41 { 42 const char *key = vkey; 43 const struct syscall *entry = ventry; 44 45 return strcmp(key, entry->name); 46 } 47 48 static int syscallcmp(const void *va, const void *vb) 49 { 50 const struct syscall *a = va, *b = vb; 51 52 return strcmp(a->name, b->name); 53 } 54 55 static int syscalltbl__init_native(struct syscalltbl *tbl) 56 { 57 int nr_entries = 0, i, j; 58 struct syscall *entries; 59 60 for (i = 0; i <= syscalltbl_native_max_id; ++i) 61 if (syscalltbl_native[i]) 62 ++nr_entries; 63 64 entries = tbl->syscalls.entries = malloc(sizeof(struct syscall) * nr_entries); 65 if (tbl->syscalls.entries == NULL) 66 return -1; 67 68 for (i = 0, j = 0; i <= syscalltbl_native_max_id; ++i) { 69 if (syscalltbl_native[i]) { 70 entries[j].name = syscalltbl_native[i]; 71 entries[j].id = i; 72 ++j; 73 } 74 } 75 76 qsort(tbl->syscalls.entries, nr_entries, sizeof(struct syscall), syscallcmp); 77 tbl->syscalls.nr_entries = nr_entries; 78 return 0; 79 } 80 81 struct syscalltbl *syscalltbl__new(void) 82 { 83 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 84 if (tbl) { 85 if (syscalltbl__init_native(tbl)) { 86 free(tbl); 87 return NULL; 88 } 89 } 90 return tbl; 91 } 92 93 void syscalltbl__delete(struct syscalltbl *tbl) 94 { 95 zfree(&tbl->syscalls.entries); 96 free(tbl); 97 } 98 99 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 100 { 101 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 102 } 103 104 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 105 { 106 struct syscall *sc = bsearch(name, tbl->syscalls.entries, 107 tbl->syscalls.nr_entries, sizeof(*sc), 108 syscallcmpname); 109 110 return sc ? sc->id : -1; 111 } 112 113 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 114 { 115 int i; 116 struct syscall *syscalls = tbl->syscalls.entries; 117 118 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { 119 if (strglobmatch(syscalls[i].name, syscall_glob)) { 120 *idx = i; 121 return syscalls[i].id; 122 } 123 } 124 125 return -1; 126 } 127 128 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 129 { 130 *idx = -1; 131 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 132 } 133 134 #else /* HAVE_SYSCALL_TABLE */ 135 136 #include <libaudit.h> 137 138 struct syscalltbl *syscalltbl__new(void) 139 { 140 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 141 if (tbl) 142 tbl->audit_machine = audit_detect_machine(); 143 return tbl; 144 } 145 146 void syscalltbl__delete(struct syscalltbl *tbl) 147 { 148 free(tbl); 149 } 150 151 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 152 { 153 return audit_syscall_to_name(id, tbl->audit_machine); 154 } 155 156 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 157 { 158 return audit_name_to_syscall(name, tbl->audit_machine); 159 } 160 161 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 162 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 163 { 164 return -1; 165 } 166 167 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 168 { 169 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 170 } 171 #endif /* HAVE_SYSCALL_TABLE */ 172