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Message-ID: <20171027180637.GC10611@google.com>
Date: Fri, 27 Oct 2017 11:06:37 -0700
From: Michael Halcrow <mhalcrow@...gle.com>
To: Eric Biggers <ebiggers3@...il.com>
Cc: linux-fscrypt@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
linux-mtd@...ts.infradead.org, linux-api@...r.kernel.org,
keyrings@...r.kernel.org, "Theodore Y . Ts'o" <tytso@....edu>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Gwendal Grignou <gwendal@...omium.org>,
Ryo Hashimoto <hashimoto@...omium.org>,
Sarthak Kukreti <sarthakkukreti@...omium.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Eric Biggers <ebiggers@...gle.com>
Subject: Re: [RFC PATCH 03/25] fscrypt: use FSCRYPT_* definitions, not FS_*
On Mon, Oct 23, 2017 at 02:40:36PM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
>
> Update the filesystem encryption kernel code to use the new names for
> the UAPI constants rather than the old names.
>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
Reviewed-by: Michael Halcrow <mhalcrow@...gle.com>
> ---
> fs/crypto/fname.c | 4 ++--
> fs/crypto/fscrypt_private.h | 4 ++--
> fs/crypto/keyinfo.c | 36 +++++++++++++++++-------------------
> fs/crypto/policy.c | 14 +++++++-------
> include/linux/fscrypt.h | 8 ++++----
> 5 files changed, 32 insertions(+), 34 deletions(-)
>
> diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
> index 2878289b3ed2..c91bcef65b9f 100644
> --- a/fs/crypto/fname.c
> +++ b/fs/crypto/fname.c
> @@ -46,7 +46,7 @@ static int fname_encrypt(struct inode *inode,
> int res = 0;
> char iv[FS_CRYPTO_BLOCK_SIZE];
> struct scatterlist sg;
> - int padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK);
> + int padding = 4 << (ci->ci_flags & FSCRYPT_POLICY_FLAGS_PAD_MASK);
> unsigned int lim;
> unsigned int cryptlen;
>
> @@ -217,7 +217,7 @@ u32 fscrypt_fname_encrypted_size(const struct inode *inode, u32 ilen)
> struct fscrypt_info *ci = inode->i_crypt_info;
>
> if (ci)
> - padding = 4 << (ci->ci_flags & FS_POLICY_FLAGS_PAD_MASK);
> + padding = 4 << (ci->ci_flags & FSCRYPT_POLICY_FLAGS_PAD_MASK);
> ilen = max(ilen, (u32)FS_CRYPTO_BLOCK_SIZE);
> return round_up(ilen, padding);
> }
> diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
> index a180981ee6d7..5cb80a2d39ea 100644
> --- a/fs/crypto/fscrypt_private.h
> +++ b/fs/crypto/fscrypt_private.h
> @@ -43,7 +43,7 @@ struct fscrypt_context {
> u8 contents_encryption_mode;
> u8 filenames_encryption_mode;
> u8 flags;
> - u8 master_key_descriptor[FS_KEY_DESCRIPTOR_SIZE];
> + u8 master_key_descriptor[FSCRYPT_KEY_DESCRIPTOR_SIZE];
> u8 nonce[FS_KEY_DERIVATION_NONCE_SIZE];
> } __packed;
>
> @@ -59,7 +59,7 @@ struct fscrypt_info {
> u8 ci_flags;
> struct crypto_skcipher *ci_ctfm;
> struct crypto_cipher *ci_essiv_tfm;
> - u8 ci_master_key[FS_KEY_DESCRIPTOR_SIZE];
> + u8 ci_master_key[FSCRYPT_KEY_DESCRIPTOR_SIZE];
> };
>
> typedef enum {
> diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
> index 7aed93bcfb82..ac41f646e7b7 100644
> --- a/fs/crypto/keyinfo.c
> +++ b/fs/crypto/keyinfo.c
> @@ -38,7 +38,7 @@ static void derive_crypt_complete(struct crypto_async_request *req, int rc)
> */
> static int derive_key_aes(u8 deriving_key[FS_AES_128_ECB_KEY_SIZE],
> const struct fscrypt_key *source_key,
> - u8 derived_raw_key[FS_MAX_KEY_SIZE])
> + u8 derived_raw_key[FSCRYPT_MAX_KEY_SIZE])
> {
> int res = 0;
> struct skcipher_request *req = NULL;
> @@ -91,7 +91,7 @@ static int validate_user_key(struct fscrypt_info *crypt_info,
> int res;
>
> description = kasprintf(GFP_NOFS, "%s%*phN", prefix,
> - FS_KEY_DESCRIPTOR_SIZE,
> + FSCRYPT_KEY_DESCRIPTOR_SIZE,
> ctx->master_key_descriptor);
> if (!description)
> return -ENOMEM;
> @@ -121,7 +121,8 @@ static int validate_user_key(struct fscrypt_info *crypt_info,
> master_key = (struct fscrypt_key *)ukp->data;
> BUILD_BUG_ON(FS_AES_128_ECB_KEY_SIZE != FS_KEY_DERIVATION_NONCE_SIZE);
>
> - if (master_key->size < min_keysize || master_key->size > FS_MAX_KEY_SIZE
> + if (master_key->size < min_keysize ||
> + master_key->size > FSCRYPT_MAX_KEY_SIZE
> || master_key->size % AES_BLOCK_SIZE != 0) {
Format nit: This makes the placement of "||" inconsistent across lines
in this same expression.
> printk_once(KERN_WARNING
> "%s: key size incorrect: %d\n",
> @@ -140,14 +141,10 @@ static const struct {
> const char *cipher_str;
> int keysize;
> } available_modes[] = {
> - [FS_ENCRYPTION_MODE_AES_256_XTS] = { "xts(aes)",
> - FS_AES_256_XTS_KEY_SIZE },
> - [FS_ENCRYPTION_MODE_AES_256_CTS] = { "cts(cbc(aes))",
> - FS_AES_256_CTS_KEY_SIZE },
> - [FS_ENCRYPTION_MODE_AES_128_CBC] = { "cbc(aes)",
> - FS_AES_128_CBC_KEY_SIZE },
> - [FS_ENCRYPTION_MODE_AES_128_CTS] = { "cts(cbc(aes))",
> - FS_AES_128_CTS_KEY_SIZE },
> + [FSCRYPT_MODE_AES_256_XTS] = { "xts(aes)", FS_AES_256_XTS_KEY_SIZE },
> + [FSCRYPT_MODE_AES_256_CTS] = { "cts(cbc(aes))", FS_AES_256_CTS_KEY_SIZE },
> + [FSCRYPT_MODE_AES_128_CBC] = { "cbc(aes)", FS_AES_128_CBC_KEY_SIZE },
> + [FSCRYPT_MODE_AES_128_CTS] = { "cts(cbc(aes))", FS_AES_128_CTS_KEY_SIZE },
> };
>
> static int determine_cipher_type(struct fscrypt_info *ci, struct inode *inode,
> @@ -278,9 +275,10 @@ int fscrypt_get_encryption_info(struct inode *inode)
> /* Fake up a context for an unencrypted directory */
> memset(&ctx, 0, sizeof(ctx));
> ctx.format = FS_ENCRYPTION_CONTEXT_FORMAT_V1;
> - ctx.contents_encryption_mode = FS_ENCRYPTION_MODE_AES_256_XTS;
> - ctx.filenames_encryption_mode = FS_ENCRYPTION_MODE_AES_256_CTS;
> - memset(ctx.master_key_descriptor, 0x42, FS_KEY_DESCRIPTOR_SIZE);
> + ctx.contents_encryption_mode = FSCRYPT_MODE_AES_256_XTS;
> + ctx.filenames_encryption_mode = FSCRYPT_MODE_AES_256_CTS;
> + memset(ctx.master_key_descriptor, 0x42,
> + FSCRYPT_KEY_DESCRIPTOR_SIZE);
> } else if (res != sizeof(ctx)) {
> return -EINVAL;
> }
> @@ -288,7 +286,7 @@ int fscrypt_get_encryption_info(struct inode *inode)
> if (ctx.format != FS_ENCRYPTION_CONTEXT_FORMAT_V1)
> return -EINVAL;
>
> - if (ctx.flags & ~FS_POLICY_FLAGS_VALID)
> + if (ctx.flags & ~FSCRYPT_POLICY_FLAGS_VALID)
> return -EINVAL;
>
> crypt_info = kmem_cache_alloc(fscrypt_info_cachep, GFP_NOFS);
> @@ -312,12 +310,12 @@ int fscrypt_get_encryption_info(struct inode *inode)
> * crypto API as part of key derivation.
> */
> res = -ENOMEM;
> - raw_key = kmalloc(FS_MAX_KEY_SIZE, GFP_NOFS);
> + raw_key = kmalloc(FSCRYPT_MAX_KEY_SIZE, GFP_NOFS);
> if (!raw_key)
> goto out;
>
> - res = validate_user_key(crypt_info, &ctx, raw_key, FS_KEY_DESC_PREFIX,
> - keysize);
> + res = validate_user_key(crypt_info, &ctx, raw_key,
> + FSCRYPT_KEY_DESC_PREFIX, keysize);
> if (res && inode->i_sb->s_cop->key_prefix) {
> int res2 = validate_user_key(crypt_info, &ctx, raw_key,
> inode->i_sb->s_cop->key_prefix,
> @@ -349,7 +347,7 @@ int fscrypt_get_encryption_info(struct inode *inode)
> goto out;
>
> if (S_ISREG(inode->i_mode) &&
> - crypt_info->ci_data_mode == FS_ENCRYPTION_MODE_AES_128_CBC) {
> + crypt_info->ci_data_mode == FSCRYPT_MODE_AES_128_CBC) {
> res = init_essiv_generator(crypt_info, raw_key, keysize);
> if (res) {
> pr_debug("%s: error %d (inode %lu) allocating essiv tfm\n",
> diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c
> index 6a63b8a0d46c..19332a6fd52d 100644
> --- a/fs/crypto/policy.c
> +++ b/fs/crypto/policy.c
> @@ -21,7 +21,7 @@ static bool is_encryption_context_consistent_with_policy(
> const struct fscrypt_policy *policy)
> {
> return memcmp(ctx->master_key_descriptor, policy->master_key_descriptor,
> - FS_KEY_DESCRIPTOR_SIZE) == 0 &&
> + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 &&
> (ctx->flags == policy->flags) &&
> (ctx->contents_encryption_mode ==
> policy->contents_encryption_mode) &&
> @@ -36,13 +36,13 @@ static int create_encryption_context_from_policy(struct inode *inode,
>
> ctx.format = FS_ENCRYPTION_CONTEXT_FORMAT_V1;
> memcpy(ctx.master_key_descriptor, policy->master_key_descriptor,
> - FS_KEY_DESCRIPTOR_SIZE);
> + FSCRYPT_KEY_DESCRIPTOR_SIZE);
>
> if (!fscrypt_valid_enc_modes(policy->contents_encryption_mode,
> policy->filenames_encryption_mode))
> return -EINVAL;
>
> - if (policy->flags & ~FS_POLICY_FLAGS_VALID)
> + if (policy->flags & ~FSCRYPT_POLICY_FLAGS_VALID)
> return -EINVAL;
>
> ctx.contents_encryption_mode = policy->contents_encryption_mode;
> @@ -125,7 +125,7 @@ int fscrypt_ioctl_get_policy(struct file *filp, void __user *arg)
> policy.filenames_encryption_mode = ctx.filenames_encryption_mode;
> policy.flags = ctx.flags;
> memcpy(policy.master_key_descriptor, ctx.master_key_descriptor,
> - FS_KEY_DESCRIPTOR_SIZE);
> + FSCRYPT_KEY_DESCRIPTOR_SIZE);
>
> if (copy_to_user(arg, &policy, sizeof(policy)))
> return -EFAULT;
> @@ -199,7 +199,7 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child)
>
> if (parent_ci && child_ci) {
> return memcmp(parent_ci->ci_master_key, child_ci->ci_master_key,
> - FS_KEY_DESCRIPTOR_SIZE) == 0 &&
> + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 &&
> (parent_ci->ci_data_mode == child_ci->ci_data_mode) &&
> (parent_ci->ci_filename_mode ==
> child_ci->ci_filename_mode) &&
> @@ -216,7 +216,7 @@ int fscrypt_has_permitted_context(struct inode *parent, struct inode *child)
>
> return memcmp(parent_ctx.master_key_descriptor,
> child_ctx.master_key_descriptor,
> - FS_KEY_DESCRIPTOR_SIZE) == 0 &&
> + FSCRYPT_KEY_DESCRIPTOR_SIZE) == 0 &&
> (parent_ctx.contents_encryption_mode ==
> child_ctx.contents_encryption_mode) &&
> (parent_ctx.filenames_encryption_mode ==
> @@ -254,7 +254,7 @@ int fscrypt_inherit_context(struct inode *parent, struct inode *child,
> ctx.filenames_encryption_mode = ci->ci_filename_mode;
> ctx.flags = ci->ci_flags;
> memcpy(ctx.master_key_descriptor, ci->ci_master_key,
> - FS_KEY_DESCRIPTOR_SIZE);
> + FSCRYPT_KEY_DESCRIPTOR_SIZE);
> get_random_bytes(ctx.nonce, FS_KEY_DERIVATION_NONCE_SIZE);
> BUILD_BUG_ON(sizeof(ctx) != FSCRYPT_SET_CONTEXT_MAX_SIZE);
> res = parent->i_sb->s_cop->set_context(child, &ctx,
> diff --git a/include/linux/fscrypt.h b/include/linux/fscrypt.h
> index f7aa7d62e235..671ce57e4673 100644
> --- a/include/linux/fscrypt.h
> +++ b/include/linux/fscrypt.h
> @@ -99,12 +99,12 @@ static inline bool fscrypt_dummy_context_enabled(struct inode *inode)
> static inline bool fscrypt_valid_enc_modes(u32 contents_mode,
> u32 filenames_mode)
> {
> - if (contents_mode == FS_ENCRYPTION_MODE_AES_128_CBC &&
> - filenames_mode == FS_ENCRYPTION_MODE_AES_128_CTS)
> + if (contents_mode == FSCRYPT_MODE_AES_128_CBC &&
> + filenames_mode == FSCRYPT_MODE_AES_128_CTS)
> return true;
>
> - if (contents_mode == FS_ENCRYPTION_MODE_AES_256_XTS &&
> - filenames_mode == FS_ENCRYPTION_MODE_AES_256_CTS)
> + if (contents_mode == FSCRYPT_MODE_AES_256_XTS &&
> + filenames_mode == FSCRYPT_MODE_AES_256_CTS)
> return true;
>
> return false;
> --
> 2.15.0.rc0.271.g36b669edcc-goog
>
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