int
_pthread_mutex_init(pthread_mutex_t *mutex,
const pthread_mutexattr_t *mutex_attr)
{
struct pthread_mutex_attr mattr, *mattrp;
if ((mutex_attr == NULL) || (*mutex_attr == NULL))
return (__pthread_mutex_init(mutex, &static_mattr));
else {
mattr = **mutex_attr;
mattr.m_flags |= MUTEX_FLAGS_PRIVATE;
mattrp = &mattr;
return (__pthread_mutex_init(mutex, &mattrp));
}
}
struct regex_data *regex_data_create(void)
{
struct regex_data *regex_data =
(struct regex_data *)calloc(1, sizeof(struct regex_data));
__pthread_mutex_init(®ex_data->match_mutex, NULL);
return regex_data;
}
/* opendir just makes an open() call - it return NULL if it fails
* (open sets errno), otherwise it returns a DIR * pointer.
*/
DIR *opendir(const char *name)
{
int fd;
struct stat statbuf;
DIR *ptr;
#ifndef O_DIRECTORY
/* O_DIRECTORY is linux specific and has been around since like 2.1.x */
if (stat(name, &statbuf))
return NULL;
if (!S_ISDIR(statbuf.st_mode)) {
__set_errno(ENOTDIR);
return NULL;
}
# define O_DIRECTORY 0
#endif
if ((fd = open(name, O_RDONLY|O_NDELAY|O_DIRECTORY)) < 0)
return NULL;
/* Note: we should check to make sure that between the stat() and open()
* call, 'name' didnt change on us, but that's only if O_DIRECTORY isnt
* defined and since Linux has supported it for like ever, i'm not going
* to worry about it right now (if ever). */
if (fstat(fd, &statbuf) < 0)
goto close_and_ret;
/* According to POSIX, directory streams should be closed when
* exec. From "Anna Pluzhnikov" <*****@*****.**>.
*/
if (fcntl(fd, F_SETFD, FD_CLOEXEC) < 0) {
int saved_errno;
close_and_ret:
saved_errno = errno;
close(fd);
__set_errno(saved_errno);
return NULL;
}
if (!(ptr = malloc(sizeof(*ptr))))
goto nomem_close_and_ret;
ptr->dd_fd = fd;
ptr->dd_nextloc = ptr->dd_size = ptr->dd_nextoff = 0;
ptr->dd_max = statbuf.st_blksize;
if (ptr->dd_max < 512)
ptr->dd_max = 512;
if (!(ptr->dd_buf = calloc(1, ptr->dd_max))) {
free(ptr);
nomem_close_and_ret:
close(fd);
__set_errno(ENOMEM);
return NULL;
}
__pthread_mutex_init(&(ptr->dd_lock), NULL);
return ptr;
}
void
__fresetlockfiles (void)
{
#ifdef USE_IN_LIBIO
_IO_ITER i;
pthread_mutexattr_t attr;
__pthread_mutexattr_init (&attr);
__pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
__pthread_mutex_init (_IO_iter_file(i)->_lock, &attr);
__pthread_mutexattr_destroy (&attr);
_IO_list_resetlock();
#endif
}
static int load_mmap(FILE *fp, size_t len, struct selabel_handle *rec,
const char *path)
{
struct saved_data *data = (struct saved_data *)rec->data;
int rc;
char *addr, *str_buf;
int *stem_map;
struct mmap_area *mmap_area;
uint32_t i, magic, version;
uint32_t entry_len, stem_map_len, regex_array_len;
const char *reg_version;
const char *reg_arch;
char reg_arch_matches = 0;
mmap_area = malloc(sizeof(*mmap_area));
if (!mmap_area) {
return -1;
}
addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fileno(fp), 0);
if (addr == MAP_FAILED) {
free(mmap_area);
perror("mmap");
return -1;
}
/* save where we mmap'd the file to cleanup on close() */
mmap_area->addr = mmap_area->next_addr = addr;
mmap_area->len = mmap_area->next_len = len;
mmap_area->next = data->mmap_areas;
data->mmap_areas = mmap_area;
/* check if this looks like an fcontext file */
rc = next_entry(&magic, mmap_area, sizeof(uint32_t));
if (rc < 0 || magic != SELINUX_MAGIC_COMPILED_FCONTEXT)
return -1;
/* check if this version is higher than we understand */
rc = next_entry(&version, mmap_area, sizeof(uint32_t));
if (rc < 0 || version > SELINUX_COMPILED_FCONTEXT_MAX_VERS)
return -1;
reg_version = regex_version();
if (!reg_version)
return -1;
reg_arch = regex_arch_string();
if (!reg_arch)
return -1;
if (version >= SELINUX_COMPILED_FCONTEXT_PCRE_VERS) {
len = strlen(reg_version);
rc = next_entry(&entry_len, mmap_area, sizeof(uint32_t));
if (rc < 0)
return -1;
/* Check version lengths */
if (len != entry_len)
return -1;
/* Check if regex version mismatch */
str_buf = malloc(entry_len + 1);
if (!str_buf)
return -1;
rc = next_entry(str_buf, mmap_area, entry_len);
if (rc < 0) {
free(str_buf);
return -1;
}
str_buf[entry_len] = '\0';
if ((strcmp(str_buf, reg_version) != 0)) {
free(str_buf);
return -1;
}
free(str_buf);
if (version >= SELINUX_COMPILED_FCONTEXT_REGEX_ARCH) {
len = strlen(reg_arch);
rc = next_entry(&entry_len, mmap_area,
sizeof(uint32_t));
if (rc < 0)
return -1;
/* Check arch string lengths */
if (len != entry_len) {
/*
* Skip the entry and conclude that we have
* a mismatch, which is not fatal.
*/
next_entry(NULL, mmap_area, entry_len);
goto end_arch_check;
}
/* Check if arch string mismatch */
str_buf = malloc(entry_len + 1);
if (!str_buf)
return -1;
rc = next_entry(str_buf, mmap_area, entry_len);
if (rc < 0) {
free(str_buf);
return -1;
}
str_buf[entry_len] = '\0';
reg_arch_matches = strcmp(str_buf, reg_arch) == 0;
free(str_buf);
}
}
end_arch_check:
/* allocate the stems_data array */
rc = next_entry(&stem_map_len, mmap_area, sizeof(uint32_t));
if (rc < 0)
return -1;
/*
* map indexed by the stem # in the mmap file and contains the stem
* number in the data stem_arr
*/
stem_map = calloc(stem_map_len, sizeof(*stem_map));
if (!stem_map)
return -1;
for (i = 0; i < stem_map_len; i++) {
char *buf;
uint32_t stem_len;
int newid;
/* the length does not inlude the nul */
rc = next_entry(&stem_len, mmap_area, sizeof(uint32_t));
if (rc < 0 || !stem_len) {
rc = -1;
goto out;
}
/* Check for stem_len wrap around. */
if (stem_len < UINT32_MAX) {
buf = (char *)mmap_area->next_addr;
/* Check if over-run before null check. */
rc = next_entry(NULL, mmap_area, (stem_len + 1));
if (rc < 0)
goto out;
if (buf[stem_len] != '\0') {
rc = -1;
goto out;
}
} else {
rc = -1;
goto out;
}
/* store the mapping between old and new */
newid = find_stem(data, buf, stem_len);
if (newid < 0) {
newid = store_stem(data, buf, stem_len);
if (newid < 0) {
rc = newid;
goto out;
}
data->stem_arr[newid].from_mmap = 1;
}
stem_map[i] = newid;
}
/* allocate the regex array */
rc = next_entry(®ex_array_len, mmap_area, sizeof(uint32_t));
if (rc < 0 || !regex_array_len) {
rc = -1;
goto out;
}
for (i = 0; i < regex_array_len; i++) {
struct spec *spec;
int32_t stem_id, meta_chars;
uint32_t mode = 0, prefix_len = 0;
rc = grow_specs(data);
if (rc < 0)
goto out;
spec = &data->spec_arr[data->nspec];
spec->from_mmap = 1;
/* Process context */
rc = next_entry(&entry_len, mmap_area, sizeof(uint32_t));
if (rc < 0 || !entry_len) {
rc = -1;
goto out;
}
str_buf = malloc(entry_len);
if (!str_buf) {
rc = -1;
goto out;
}
rc = next_entry(str_buf, mmap_area, entry_len);
if (rc < 0) {
free(str_buf);
goto out;
}
if (str_buf[entry_len - 1] != '\0') {
free(str_buf);
rc = -1;
goto out;
}
spec->lr.ctx_raw = str_buf;
if (strcmp(spec->lr.ctx_raw, "<<none>>") && rec->validating) {
if (selabel_validate(rec, &spec->lr) < 0) {
selinux_log(SELINUX_ERROR,
"%s: context %s is invalid\n",
path, spec->lr.ctx_raw);
goto out;
}
}
/* Process regex string */
rc = next_entry(&entry_len, mmap_area, sizeof(uint32_t));
if (rc < 0 || !entry_len) {
rc = -1;
goto out;
}
spec->regex_str = (char *)mmap_area->next_addr;
rc = next_entry(NULL, mmap_area, entry_len);
if (rc < 0)
goto out;
if (spec->regex_str[entry_len - 1] != '\0') {
rc = -1;
goto out;
}
/* Process mode */
if (version >= SELINUX_COMPILED_FCONTEXT_MODE)
rc = next_entry(&mode, mmap_area, sizeof(uint32_t));
else
rc = next_entry(&mode, mmap_area, sizeof(mode_t));
if (rc < 0)
goto out;
spec->mode = mode;
/* map the stem id from the mmap file to the data->stem_arr */
rc = next_entry(&stem_id, mmap_area, sizeof(int32_t));
if (rc < 0)
goto out;
if (stem_id < 0 || stem_id >= (int32_t)stem_map_len)
spec->stem_id = -1;
else
spec->stem_id = stem_map[stem_id];
/* retrieve the hasMetaChars bit */
rc = next_entry(&meta_chars, mmap_area, sizeof(uint32_t));
if (rc < 0)
goto out;
spec->hasMetaChars = meta_chars;
/* and prefix length for use by selabel_lookup_best_match */
if (version >= SELINUX_COMPILED_FCONTEXT_PREFIX_LEN) {
rc = next_entry(&prefix_len, mmap_area,
sizeof(uint32_t));
if (rc < 0)
goto out;
spec->prefix_len = prefix_len;
}
rc = regex_load_mmap(mmap_area, &spec->regex, reg_arch_matches,
&spec->regex_compiled);
if (rc < 0)
goto out;
__pthread_mutex_init(&spec->regex_lock, NULL);
data->nspec++;
}
rc = 0;
out:
free(stem_map);
return rc;
}
