Lucas De Marchi | e701e38 | 2012-01-26 17:01:41 -0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 ProFUSION embedded systems |
| 3 | * |
| 4 | * This program is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 18 | #include <assert.h> |
| 19 | #include <errno.h> |
| 20 | #include <dirent.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <dlfcn.h> |
| 23 | #include <limits.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <stdarg.h> |
| 26 | #include <stddef.h> |
| 27 | #include <string.h> |
| 28 | #include <stdio.h> |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/stat.h> |
| 31 | #include <unistd.h> |
| 32 | |
| 33 | /* kmod_elf_get_section() is not exported, we need the private header */ |
| 34 | #include <libkmod-private.h> |
| 35 | |
| 36 | /* FIXME: hack, change name so we don't clash */ |
| 37 | #undef ERR |
Lucas De Marchi | 5a2949c | 2012-05-25 00:30:37 -0300 | [diff] [blame] | 38 | #include "mkdir.h" |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 39 | #include "testsuite.h" |
| 40 | #include "stripped-module.h" |
| 41 | |
| 42 | struct mod { |
| 43 | struct mod *next; |
| 44 | int ret; |
| 45 | int errcode; |
| 46 | char name[]; |
| 47 | }; |
| 48 | |
| 49 | static struct mod *modules; |
| 50 | static bool need_init = true; |
Lucas De Marchi | a655370 | 2012-06-05 00:53:15 -0300 | [diff] [blame] | 51 | static struct kmod_ctx *ctx; |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 52 | |
| 53 | static void parse_retcodes(struct mod *_modules, const char *s) |
| 54 | { |
| 55 | const char *p; |
| 56 | |
| 57 | if (s == NULL) |
| 58 | return; |
| 59 | |
| 60 | for (p = s;;) { |
| 61 | struct mod *mod; |
| 62 | const char *modname; |
| 63 | char *end; |
| 64 | size_t modnamelen; |
| 65 | int ret, errcode; |
| 66 | long l; |
| 67 | |
| 68 | modname = p; |
| 69 | if (modname == NULL || modname[0] == '\0') |
| 70 | break; |
| 71 | |
| 72 | modnamelen = strcspn(s, ":"); |
| 73 | if (modname[modnamelen] != ':') |
| 74 | break; |
| 75 | |
| 76 | p = modname + modnamelen + 1; |
| 77 | if (p == NULL) |
| 78 | break; |
| 79 | |
| 80 | l = strtol(p, &end, 0); |
| 81 | if (end == p || *end != ':') |
| 82 | break; |
| 83 | ret = (int) l; |
| 84 | p = end + 1; |
| 85 | |
| 86 | l = strtol(p, &end, 0); |
| 87 | if (*end == ':') |
| 88 | p = end + 1; |
| 89 | else if (*end != '\0') |
| 90 | break; |
| 91 | |
| 92 | errcode = (int) l; |
| 93 | |
| 94 | mod = malloc(sizeof(*mod) + modnamelen + 1); |
| 95 | if (mod == NULL) |
| 96 | break; |
| 97 | |
| 98 | memcpy(mod->name, modname, modnamelen); |
| 99 | mod->name[modnamelen] = '\0'; |
| 100 | mod->ret = ret; |
| 101 | mod->errcode = errcode; |
| 102 | mod->next = _modules; |
| 103 | _modules = mod; |
| 104 | } |
| 105 | } |
| 106 | |
Lucas De Marchi | 5a2949c | 2012-05-25 00:30:37 -0300 | [diff] [blame] | 107 | static int write_one_line_file(const char *fn, const char *line, int len) |
| 108 | { |
| 109 | FILE *f; |
| 110 | int r; |
| 111 | |
| 112 | assert(fn); |
| 113 | assert(line); |
| 114 | |
| 115 | f = fopen(fn, "we"); |
| 116 | if (!f) |
| 117 | return -errno; |
| 118 | |
| 119 | errno = 0; |
| 120 | if (fputs(line, f) < 0) { |
| 121 | r = -errno; |
| 122 | goto finish; |
| 123 | } |
| 124 | |
| 125 | fflush(f); |
| 126 | |
| 127 | if (ferror(f)) { |
| 128 | if (errno != 0) |
| 129 | r = -errno; |
| 130 | else |
| 131 | r = -EIO; |
| 132 | } else |
| 133 | r = 0; |
| 134 | |
| 135 | finish: |
| 136 | fclose(f); |
| 137 | return r; |
| 138 | } |
| 139 | |
| 140 | static int create_sysfs_files(const char *modname) |
| 141 | { |
| 142 | char buf[PATH_MAX]; |
| 143 | const char *sysfsmod = "/sys/module/"; |
| 144 | int len = strlen(sysfsmod); |
| 145 | |
| 146 | memcpy(buf, sysfsmod, len); |
| 147 | strcpy(buf + len, modname); |
| 148 | len += strlen(modname); |
| 149 | |
Lucas De Marchi | 33202e8 | 2012-06-19 13:09:23 -0300 | [diff] [blame^] | 150 | assert(mkdir_p(buf, 0755) >= 0); |
Lucas De Marchi | 5a2949c | 2012-05-25 00:30:37 -0300 | [diff] [blame] | 151 | |
| 152 | strcpy(buf + len, "/initstate"); |
| 153 | return write_one_line_file(buf, "live\n", strlen("live\n")); |
| 154 | } |
| 155 | |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 156 | static struct mod *find_module(struct mod *_modules, const char *modname) |
| 157 | { |
| 158 | struct mod *mod; |
| 159 | |
| 160 | for (mod = _modules; mod != NULL; mod = mod->next) { |
Lucas De Marchi | 90fc410 | 2012-06-05 00:07:38 -0300 | [diff] [blame] | 161 | if (strcmp(mod->name, modname) == 0) |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 162 | return mod; |
| 163 | } |
| 164 | |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | static void init_retcodes(void) |
| 169 | { |
| 170 | const char *s; |
| 171 | |
| 172 | if (!need_init) |
| 173 | return; |
| 174 | |
| 175 | need_init = false; |
| 176 | s = getenv(S_TC_INIT_MODULE_RETCODES); |
| 177 | if (s == NULL) { |
| 178 | fprintf(stderr, "TRAP init_module(): missing export %s?\n", |
| 179 | S_TC_INIT_MODULE_RETCODES); |
| 180 | } |
| 181 | |
Lucas De Marchi | a655370 | 2012-06-05 00:53:15 -0300 | [diff] [blame] | 182 | ctx = kmod_new(NULL, NULL); |
| 183 | |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 184 | parse_retcodes(modules, s); |
| 185 | } |
| 186 | |
Lucas De Marchi | a655370 | 2012-06-05 00:53:15 -0300 | [diff] [blame] | 187 | static inline bool module_is_inkernel(const char *modname) |
| 188 | { |
| 189 | struct kmod_module *mod; |
| 190 | int state; |
| 191 | bool ret; |
| 192 | |
| 193 | if (kmod_module_new_from_name(ctx, modname, &mod) < 0) |
| 194 | return false; |
| 195 | |
| 196 | state = kmod_module_get_initstate(mod); |
| 197 | |
| 198 | if (state == KMOD_MODULE_LIVE || |
| 199 | state == KMOD_MODULE_BUILTIN) |
| 200 | ret = true; |
| 201 | else |
| 202 | ret = false; |
| 203 | |
| 204 | kmod_module_unref(mod); |
| 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 209 | TS_EXPORT long init_module(void *mem, unsigned long len, const char *args); |
| 210 | |
| 211 | /* |
Lucas De Marchi | ddf1e7a | 2012-06-05 00:20:42 -0300 | [diff] [blame] | 212 | * Default behavior is to try to mimic init_module behavior inside the kernel. |
| 213 | * If it is a simple test that you know the error code, set the return code |
| 214 | * in TESTSUITE_INIT_MODULE_RETCODES env var instead. |
| 215 | * |
| 216 | * The exception is when the module name is not find in the memory passed. |
| 217 | * This is because we want to be able to pass dummy modules (and not real |
| 218 | * ones) and it still work. |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 219 | */ |
| 220 | long init_module(void *mem, unsigned long len, const char *args) |
| 221 | { |
| 222 | const char *modname; |
| 223 | struct kmod_elf *elf; |
| 224 | struct mod *mod; |
| 225 | const void *buf; |
| 226 | uint64_t bufsize; |
| 227 | int err; |
| 228 | |
| 229 | init_retcodes(); |
| 230 | |
| 231 | elf = kmod_elf_new(mem, len); |
| 232 | if (elf == NULL) |
| 233 | return 0; |
| 234 | |
| 235 | err = kmod_elf_get_section(elf, ".gnu.linkonce.this_module", &buf, |
| 236 | &bufsize); |
| 237 | kmod_elf_unref(elf); |
| 238 | |
| 239 | /* |
| 240 | * We couldn't find the module's name inside the ELF file. Just exit |
| 241 | * as if it was successful |
| 242 | */ |
| 243 | if (err < 0) |
| 244 | return 0; |
| 245 | |
| 246 | modname = (char *)buf + offsetof(struct module, name); |
| 247 | mod = find_module(modules, modname); |
Lucas De Marchi | ddf1e7a | 2012-06-05 00:20:42 -0300 | [diff] [blame] | 248 | if (mod != NULL) { |
| 249 | errno = mod->errcode; |
| 250 | err = mod->ret; |
Lucas De Marchi | a655370 | 2012-06-05 00:53:15 -0300 | [diff] [blame] | 251 | } else if (module_is_inkernel(modname)) { |
| 252 | err = -1; |
| 253 | errno = EEXIST; |
| 254 | } else |
Lucas De Marchi | ddf1e7a | 2012-06-05 00:20:42 -0300 | [diff] [blame] | 255 | err = 0; |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 256 | |
Lucas De Marchi | ddf1e7a | 2012-06-05 00:20:42 -0300 | [diff] [blame] | 257 | if (err == 0) |
| 258 | create_sysfs_files(modname); |
| 259 | |
| 260 | return err; |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | /* the test is going away anyway, but lets keep valgrind happy */ |
| 264 | void free_resources(void) __attribute__((destructor)); |
| 265 | void free_resources(void) |
| 266 | { |
| 267 | while (modules) { |
| 268 | struct mod *mod = modules->next; |
| 269 | free(modules); |
| 270 | modules = mod; |
| 271 | } |
Lucas De Marchi | a655370 | 2012-06-05 00:53:15 -0300 | [diff] [blame] | 272 | |
| 273 | if (ctx) |
| 274 | kmod_unref(ctx); |
Lucas De Marchi | 53646fc | 2012-01-26 02:09:28 -0200 | [diff] [blame] | 275 | } |