From 63cec1389e116ae0e2a15e612a5b49651e04be3f Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Mon, 4 Apr 2022 18:09:14 -0700 Subject: fscrypt: split up FS_CRYPTO_BLOCK_SIZE FS_CRYPTO_BLOCK_SIZE is neither the filesystem block size nor the granularity of encryption. Rather, it defines two logically separate constraints that both arise from the block size of the AES cipher: - The alignment required for the lengths of file contents blocks - The minimum input/output length for the filenames encryption modes Since there are way too many things called the "block size", and the connection with the AES block size is not easily understood, split FS_CRYPTO_BLOCK_SIZE into two constants FSCRYPT_CONTENTS_ALIGNMENT and FSCRYPT_FNAME_MIN_MSG_LEN that more clearly describe what they are. Signed-off-by: Eric Biggers Link: https://lore.kernel.org/r/20220405010914.18519-1-ebiggers@kernel.org --- fs/crypto/crypto.c | 10 +++++----- fs/crypto/fname.c | 11 +++++++++-- 2 files changed, 14 insertions(+), 7 deletions(-) (limited to 'fs/crypto') diff --git a/fs/crypto/crypto.c b/fs/crypto/crypto.c index 526a4c1bed99..e78be66bbf01 100644 --- a/fs/crypto/crypto.c +++ b/fs/crypto/crypto.c @@ -113,7 +113,7 @@ int fscrypt_crypt_block(const struct inode *inode, fscrypt_direction_t rw, if (WARN_ON_ONCE(len <= 0)) return -EINVAL; - if (WARN_ON_ONCE(len % FS_CRYPTO_BLOCK_SIZE != 0)) + if (WARN_ON_ONCE(len % FSCRYPT_CONTENTS_ALIGNMENT != 0)) return -EINVAL; fscrypt_generate_iv(&iv, lblk_num, ci); @@ -213,8 +213,8 @@ EXPORT_SYMBOL(fscrypt_encrypt_pagecache_blocks); * fscrypt_encrypt_block_inplace() - Encrypt a filesystem block in-place * @inode: The inode to which this block belongs * @page: The page containing the block to encrypt - * @len: Size of block to encrypt. Doesn't need to be a multiple of the - * fs block size, but must be a multiple of FS_CRYPTO_BLOCK_SIZE. + * @len: Size of block to encrypt. This must be a multiple of + * FSCRYPT_CONTENTS_ALIGNMENT. * @offs: Byte offset within @page at which the block to encrypt begins * @lblk_num: Filesystem logical block number of the block, i.e. the 0-based * number of the block within the file @@ -283,8 +283,8 @@ EXPORT_SYMBOL(fscrypt_decrypt_pagecache_blocks); * fscrypt_decrypt_block_inplace() - Decrypt a filesystem block in-place * @inode: The inode to which this block belongs * @page: The page containing the block to decrypt - * @len: Size of block to decrypt. Doesn't need to be a multiple of the - * fs block size, but must be a multiple of FS_CRYPTO_BLOCK_SIZE. + * @len: Size of block to decrypt. This must be a multiple of + * FSCRYPT_CONTENTS_ALIGNMENT. * @offs: Byte offset within @page at which the block to decrypt begins * @lblk_num: Filesystem logical block number of the block, i.e. the 0-based * number of the block within the file diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c index a9be4bc74a94..14e0ef5e9a20 100644 --- a/fs/crypto/fname.c +++ b/fs/crypto/fname.c @@ -18,6 +18,13 @@ #include #include "fscrypt_private.h" +/* + * The minimum message length (input and output length), in bytes, for all + * filenames encryption modes. Filenames shorter than this will be zero-padded + * before being encrypted. + */ +#define FSCRYPT_FNAME_MIN_MSG_LEN 16 + /* * struct fscrypt_nokey_name - identifier for directory entry when key is absent * @@ -267,7 +274,7 @@ bool fscrypt_fname_encrypted_size(const union fscrypt_policy *policy, if (orig_len > max_len) return false; - encrypted_len = max(orig_len, (u32)FS_CRYPTO_BLOCK_SIZE); + encrypted_len = max_t(u32, orig_len, FSCRYPT_FNAME_MIN_MSG_LEN); encrypted_len = round_up(encrypted_len, padding); *encrypted_len_ret = min(encrypted_len, max_len); return true; @@ -350,7 +357,7 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode, return 0; } - if (iname->len < FS_CRYPTO_BLOCK_SIZE) + if (iname->len < FSCRYPT_FNAME_MIN_MSG_LEN) return -EUCLEAN; if (fscrypt_has_encryption_key(inode)) -- cgit v1.2.3