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 12 #ifdef HAVE_SYSCALL_TABLE_SUPPORT 13 #include <linux/zalloc.h> 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 return 0; 83 } 84 85 struct syscalltbl *syscalltbl__new(void) 86 { 87 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 88 if (tbl) { 89 if (syscalltbl__init_native(tbl)) { 90 free(tbl); 91 return NULL; 92 } 93 } 94 return tbl; 95 } 96 97 void syscalltbl__delete(struct syscalltbl *tbl) 98 { 99 zfree(&tbl->syscalls.entries); 100 free(tbl); 101 } 102 103 const char *syscalltbl__name(const struct syscalltbl *tbl __maybe_unused, int id) 104 { 105 return id <= syscalltbl_native_max_id ? syscalltbl_native[id]: NULL; 106 } 107 108 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 109 { 110 struct syscall *sc = bsearch(name, tbl->syscalls.entries, 111 tbl->syscalls.nr_entries, sizeof(*sc), 112 syscallcmpname); 113 114 return sc ? sc->id : -1; 115 } 116 117 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 118 { 119 int i; 120 struct syscall *syscalls = tbl->syscalls.entries; 121 122 for (i = *idx + 1; i < tbl->syscalls.nr_entries; ++i) { 123 if (strglobmatch(syscalls[i].name, syscall_glob)) { 124 *idx = i; 125 return syscalls[i].id; 126 } 127 } 128 129 return -1; 130 } 131 132 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 133 { 134 *idx = -1; 135 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 136 } 137 138 #else /* HAVE_SYSCALL_TABLE_SUPPORT */ 139 140 #include <libaudit.h> 141 142 struct syscalltbl *syscalltbl__new(void) 143 { 144 struct syscalltbl *tbl = malloc(sizeof(*tbl)); 145 if (tbl) 146 tbl->audit_machine = audit_detect_machine(); 147 return tbl; 148 } 149 150 void syscalltbl__delete(struct syscalltbl *tbl) 151 { 152 free(tbl); 153 } 154 155 const char *syscalltbl__name(const struct syscalltbl *tbl, int id) 156 { 157 return audit_syscall_to_name(id, tbl->audit_machine); 158 } 159 160 int syscalltbl__id(struct syscalltbl *tbl, const char *name) 161 { 162 return audit_name_to_syscall(name, tbl->audit_machine); 163 } 164 165 int syscalltbl__strglobmatch_next(struct syscalltbl *tbl __maybe_unused, 166 const char *syscall_glob __maybe_unused, int *idx __maybe_unused) 167 { 168 return -1; 169 } 170 171 int syscalltbl__strglobmatch_first(struct syscalltbl *tbl, const char *syscall_glob, int *idx) 172 { 173 return syscalltbl__strglobmatch_next(tbl, syscall_glob, idx); 174 } 175 #endif /* HAVE_SYSCALL_TABLE_SUPPORT */ 176