ubifs: require key for truncate(2) of encrypted file

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Currently, filesystems allow truncate(2) on an encrypted file without
the encryption key.  However, it's impossible to correctly handle the
case where the size being truncated to is not a multiple of the
filesystem block size, because that would require decrypting the final
block, zeroing the part beyond i_size, then encrypting the block.

As other modifications to encrypted file contents are prohibited without
the key, just prohibit truncate(2) as well, making it fail with ENOKEY.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

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Eric Biggers 2017-06-13 16:47:55 -07:00 • committed by Richard Weinberger

parent 32c1431eea

commit 4afb9996a2

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fs/ubifs/file.c

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