mirror of
https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-10 13:13:44 +01:00
In storagedir, take more care with errno on empty or mislabeled file
Required for 24099 fix -- we won't be able to act based on errno unless we can trust it.
This commit is contained in:
parent
7358559524
commit
cabcb752d7
@ -187,14 +187,19 @@ storage_dir_get_usage(storage_dir_t *d)
|
||||
return d->usage;
|
||||
}
|
||||
|
||||
/** Mmap a specified file within <b>d</b>. */
|
||||
/** Mmap a specified file within <b>d</b>.
|
||||
*
|
||||
* On failure, return NULL and set errno as for tor_mmap_file(). */
|
||||
tor_mmap_t *
|
||||
storage_dir_map(storage_dir_t *d, const char *fname)
|
||||
{
|
||||
char *path = NULL;
|
||||
tor_asprintf(&path, "%s/%s", d->directory, fname);
|
||||
tor_mmap_t *result = tor_mmap_file(path);
|
||||
int errval = errno;
|
||||
tor_free(path);
|
||||
if (result == NULL)
|
||||
errno = errval;
|
||||
return result;
|
||||
}
|
||||
|
||||
@ -364,6 +369,10 @@ storage_dir_save_labeled_to_file(storage_dir_t *d,
|
||||
* the data's size into *<b>sz_out</b>. On success, also return a tor_mmap_t
|
||||
* object whose contents should not be used -- it needs to be kept around,
|
||||
* though, for as long as <b>data_out</b> is going to be valid.
|
||||
*
|
||||
* On failure, set errno as for tor_mmap_file() if the file was missing or
|
||||
* empty, and set errno to EINVAL if the file was not in the labeled
|
||||
* format expected.
|
||||
*/
|
||||
tor_mmap_t *
|
||||
storage_dir_map_labeled(storage_dir_t *dir,
|
||||
@ -373,13 +382,20 @@ storage_dir_map_labeled(storage_dir_t *dir,
|
||||
size_t *sz_out)
|
||||
{
|
||||
tor_mmap_t *m = storage_dir_map(dir, fname);
|
||||
if (! m)
|
||||
int errval;
|
||||
if (! m) {
|
||||
errval = errno;
|
||||
goto err;
|
||||
}
|
||||
const char *nulp = memchr(m->data, '\0', m->size);
|
||||
if (! nulp)
|
||||
if (! nulp) {
|
||||
errval = EINVAL;
|
||||
goto err;
|
||||
if (labels_out && config_get_lines(m->data, labels_out, 0) < 0)
|
||||
}
|
||||
if (labels_out && config_get_lines(m->data, labels_out, 0) < 0) {
|
||||
errval = EINVAL;
|
||||
goto err;
|
||||
}
|
||||
size_t offset = nulp - m->data + 1;
|
||||
tor_assert(offset <= m->size);
|
||||
*data_out = (const uint8_t *)(m->data + offset);
|
||||
@ -388,6 +404,7 @@ storage_dir_map_labeled(storage_dir_t *dir,
|
||||
return m;
|
||||
err:
|
||||
tor_munmap_file(m);
|
||||
errno = errval;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user