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Fix crypt_wipe to allocate space and not silently fail.

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This change will allocate space if underlying device is smaller file
and fail if it is block device.

Previously smaller device was quietly ignored, leading to keyslot
access failure with older dm-crypt mapped keyslot encryption
(disabled kernel user crypto API).
This commit is contained in:
Milan Broz
2019-02-06 16:14:24 +01:00
parent 0cac4a4e0c
commit ebbc5eceb8
1 changed files with 9 additions and 12 deletions
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21
lib/utils_wipe.c
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@@ -161,19 +161,16 @@ int crypt_wipe_device(struct crypt_device *cd,
if (devfd < 0)
return errno ? -errno : -EINVAL;
r = device_size(device, &dev_size);
if (r || dev_size == 0)
goto out;
if (dev_size < length)
length = 0;
if (length) {
if ((dev_size <= offset) || (dev_size - offset) < length) {
r = -EINVAL;
goto out;
}
if (length)
dev_size = offset + length;
else {
r = device_size(device, &dev_size);
if (r)
return r;
if (dev_size <= offset)
return -EINVAL;
length = dev_size - offset;
}
r = posix_memalign((void **)&sf, alignment, wipe_block_size);