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