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Diffstat (limited to 'fs/crypto/keysetup.c')
-rw-r--r--fs/crypto/keysetup.c76
1 files changed, 44 insertions, 32 deletions
diff --git a/fs/crypto/keysetup.c b/fs/crypto/keysetup.c
index 361f41ef46c7..2896046a4977 100644
--- a/fs/crypto/keysetup.c
+++ b/fs/crypto/keysetup.c
@@ -23,7 +23,7 @@ struct fscrypt_mode fscrypt_modes[] = {
.blk_crypto_mode = BLK_ENCRYPTION_MODE_AES_256_XTS,
},
[FSCRYPT_MODE_AES_256_CTS] = {
- .friendly_name = "AES-256-CTS-CBC",
+ .friendly_name = "AES-256-CBC-CTS",
.cipher_str = "cts(cbc(aes))",
.keysize = 32,
.security_strength = 32,
@@ -38,7 +38,7 @@ struct fscrypt_mode fscrypt_modes[] = {
.blk_crypto_mode = BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV,
},
[FSCRYPT_MODE_AES_128_CTS] = {
- .friendly_name = "AES-128-CTS-CBC",
+ .friendly_name = "AES-128-CBC-CTS",
.cipher_str = "cts(cbc(aes))",
.keysize = 16,
.security_strength = 16,
@@ -53,7 +53,7 @@ struct fscrypt_mode fscrypt_modes[] = {
.blk_crypto_mode = BLK_ENCRYPTION_MODE_SM4_XTS,
},
[FSCRYPT_MODE_SM4_CTS] = {
- .friendly_name = "SM4-CTS-CBC",
+ .friendly_name = "SM4-CBC-CTS",
.cipher_str = "cts(cbc(sm4))",
.keysize = 16,
.security_strength = 16,
@@ -103,7 +103,8 @@ fscrypt_allocate_skcipher(struct fscrypt_mode *mode, const u8 *raw_key,
struct crypto_skcipher *tfm;
int err;
- tfm = crypto_alloc_skcipher(mode->cipher_str, 0, 0);
+ tfm = crypto_alloc_skcipher(mode->cipher_str, 0,
+ FSCRYPT_CRYPTOAPI_MASK);
if (IS_ERR(tfm)) {
if (PTR_ERR(tfm) == -ENOENT) {
fscrypt_warn(inode,
@@ -148,7 +149,7 @@ err_free_tfm:
* and IV generation method (@ci->ci_policy.flags).
*/
int fscrypt_prepare_key(struct fscrypt_prepared_key *prep_key,
- const u8 *raw_key, const struct fscrypt_info *ci)
+ const u8 *raw_key, const struct fscrypt_inode_info *ci)
{
struct crypto_skcipher *tfm;
@@ -178,13 +179,14 @@ void fscrypt_destroy_prepared_key(struct super_block *sb,
}
/* Given a per-file encryption key, set up the file's crypto transform object */
-int fscrypt_set_per_file_enc_key(struct fscrypt_info *ci, const u8 *raw_key)
+int fscrypt_set_per_file_enc_key(struct fscrypt_inode_info *ci,
+ const u8 *raw_key)
{
ci->ci_owns_key = true;
return fscrypt_prepare_key(&ci->ci_enc_key, raw_key, ci);
}
-static int setup_per_mode_enc_key(struct fscrypt_info *ci,
+static int setup_per_mode_enc_key(struct fscrypt_inode_info *ci,
struct fscrypt_master_key *mk,
struct fscrypt_prepared_key *keys,
u8 hkdf_context, bool include_fs_uuid)
@@ -265,7 +267,7 @@ static int fscrypt_derive_siphash_key(const struct fscrypt_master_key *mk,
return 0;
}
-int fscrypt_derive_dirhash_key(struct fscrypt_info *ci,
+int fscrypt_derive_dirhash_key(struct fscrypt_inode_info *ci,
const struct fscrypt_master_key *mk)
{
int err;
@@ -279,7 +281,7 @@ int fscrypt_derive_dirhash_key(struct fscrypt_info *ci,
return 0;
}
-void fscrypt_hash_inode_number(struct fscrypt_info *ci,
+void fscrypt_hash_inode_number(struct fscrypt_inode_info *ci,
const struct fscrypt_master_key *mk)
{
WARN_ON_ONCE(ci->ci_inode->i_ino == 0);
@@ -289,7 +291,7 @@ void fscrypt_hash_inode_number(struct fscrypt_info *ci,
&mk->mk_ino_hash_key);
}
-static int fscrypt_setup_iv_ino_lblk_32_key(struct fscrypt_info *ci,
+static int fscrypt_setup_iv_ino_lblk_32_key(struct fscrypt_inode_info *ci,
struct fscrypt_master_key *mk)
{
int err;
@@ -329,7 +331,7 @@ unlock:
return 0;
}
-static int fscrypt_setup_v2_file_key(struct fscrypt_info *ci,
+static int fscrypt_setup_v2_file_key(struct fscrypt_inode_info *ci,
struct fscrypt_master_key *mk,
bool need_dirhash_key)
{
@@ -404,7 +406,7 @@ static int fscrypt_setup_v2_file_key(struct fscrypt_info *ci,
* still allow 512-bit master keys if the user chooses to use them, though.)
*/
static bool fscrypt_valid_master_key_size(const struct fscrypt_master_key *mk,
- const struct fscrypt_info *ci)
+ const struct fscrypt_inode_info *ci)
{
unsigned int min_keysize;
@@ -430,11 +432,12 @@ static bool fscrypt_valid_master_key_size(const struct fscrypt_master_key *mk,
*
* If the master key is found in the filesystem-level keyring, then it is
* returned in *mk_ret with its semaphore read-locked. This is needed to ensure
- * that only one task links the fscrypt_info into ->mk_decrypted_inodes (as
- * multiple tasks may race to create an fscrypt_info for the same inode), and to
- * synchronize the master key being removed with a new inode starting to use it.
+ * that only one task links the fscrypt_inode_info into ->mk_decrypted_inodes
+ * (as multiple tasks may race to create an fscrypt_inode_info for the same
+ * inode), and to synchronize the master key being removed with a new inode
+ * starting to use it.
*/
-static int setup_file_encryption_key(struct fscrypt_info *ci,
+static int setup_file_encryption_key(struct fscrypt_inode_info *ci,
bool need_dirhash_key,
struct fscrypt_master_key **mk_ret)
{
@@ -484,8 +487,8 @@ static int setup_file_encryption_key(struct fscrypt_info *ci,
}
down_read(&mk->mk_sem);
- /* Has the secret been removed (via FS_IOC_REMOVE_ENCRYPTION_KEY)? */
- if (!is_master_key_secret_present(&mk->mk_secret)) {
+ if (!mk->mk_present) {
+ /* FS_IOC_REMOVE_ENCRYPTION_KEY has been executed on this key */
err = -ENOKEY;
goto out_release_key;
}
@@ -519,7 +522,7 @@ out_release_key:
return err;
}
-static void put_crypt_info(struct fscrypt_info *ci)
+static void put_crypt_info(struct fscrypt_inode_info *ci)
{
struct fscrypt_master_key *mk;
@@ -537,8 +540,8 @@ static void put_crypt_info(struct fscrypt_info *ci)
/*
* Remove this inode from the list of inodes that were unlocked
* with the master key. In addition, if we're removing the last
- * inode from a master key struct that already had its secret
- * removed, then complete the full removal of the struct.
+ * inode from an incompletely removed key, then complete the
+ * full removal of the key.
*/
spin_lock(&mk->mk_decrypted_inodes_lock);
list_del(&ci->ci_master_key_link);
@@ -546,7 +549,7 @@ static void put_crypt_info(struct fscrypt_info *ci)
fscrypt_put_master_key_activeref(ci->ci_inode->i_sb, mk);
}
memzero_explicit(ci, sizeof(*ci));
- kmem_cache_free(fscrypt_info_cachep, ci);
+ kmem_cache_free(fscrypt_inode_info_cachep, ci);
}
static int
@@ -555,7 +558,7 @@ fscrypt_setup_encryption_info(struct inode *inode,
const u8 nonce[FSCRYPT_FILE_NONCE_SIZE],
bool need_dirhash_key)
{
- struct fscrypt_info *crypt_info;
+ struct fscrypt_inode_info *crypt_info;
struct fscrypt_mode *mode;
struct fscrypt_master_key *mk = NULL;
int res;
@@ -564,7 +567,7 @@ fscrypt_setup_encryption_info(struct inode *inode,
if (res)
return res;
- crypt_info = kmem_cache_zalloc(fscrypt_info_cachep, GFP_KERNEL);
+ crypt_info = kmem_cache_zalloc(fscrypt_inode_info_cachep, GFP_KERNEL);
if (!crypt_info)
return -ENOMEM;
@@ -580,6 +583,11 @@ fscrypt_setup_encryption_info(struct inode *inode,
WARN_ON_ONCE(mode->ivsize > FSCRYPT_MAX_IV_SIZE);
crypt_info->ci_mode = mode;
+ crypt_info->ci_data_unit_bits =
+ fscrypt_policy_du_bits(&crypt_info->ci_policy, inode);
+ crypt_info->ci_data_units_per_block_bits =
+ inode->i_blkbits - crypt_info->ci_data_unit_bits;
+
res = setup_file_encryption_key(crypt_info, need_dirhash_key, &mk);
if (res)
goto out;
@@ -587,8 +595,8 @@ fscrypt_setup_encryption_info(struct inode *inode,
/*
* For existing inodes, multiple tasks may race to set ->i_crypt_info.
* So use cmpxchg_release(). This pairs with the smp_load_acquire() in
- * fscrypt_get_info(). I.e., here we publish ->i_crypt_info with a
- * RELEASE barrier so that other tasks can ACQUIRE it.
+ * fscrypt_get_inode_info(). I.e., here we publish ->i_crypt_info with
+ * a RELEASE barrier so that other tasks can ACQUIRE it.
*/
if (cmpxchg_release(&inode->i_crypt_info, NULL, crypt_info) == NULL) {
/*
@@ -680,7 +688,7 @@ int fscrypt_get_encryption_info(struct inode *inode, bool allow_unsupported)
/**
* fscrypt_prepare_new_inode() - prepare to create a new inode in a directory
* @dir: a possibly-encrypted directory
- * @inode: the new inode. ->i_mode must be set already.
+ * @inode: the new inode. ->i_mode and ->i_blkbits must be set already.
* ->i_ino doesn't need to be set yet.
* @encrypt_ret: (output) set to %true if the new inode will be encrypted
*
@@ -710,6 +718,9 @@ int fscrypt_prepare_new_inode(struct inode *dir, struct inode *inode,
if (IS_ERR(policy))
return PTR_ERR(policy);
+ if (WARN_ON_ONCE(inode->i_blkbits == 0))
+ return -EINVAL;
+
if (WARN_ON_ONCE(inode->i_mode == 0))
return -EINVAL;
@@ -735,8 +746,8 @@ EXPORT_SYMBOL_GPL(fscrypt_prepare_new_inode);
* fscrypt_put_encryption_info() - free most of an inode's fscrypt data
* @inode: an inode being evicted
*
- * Free the inode's fscrypt_info. Filesystems must call this when the inode is
- * being evicted. An RCU grace period need not have elapsed yet.
+ * Free the inode's fscrypt_inode_info. Filesystems must call this when the
+ * inode is being evicted. An RCU grace period need not have elapsed yet.
*/
void fscrypt_put_encryption_info(struct inode *inode)
{
@@ -773,7 +784,7 @@ EXPORT_SYMBOL(fscrypt_free_inode);
*/
int fscrypt_drop_inode(struct inode *inode)
{
- const struct fscrypt_info *ci = fscrypt_get_info(inode);
+ const struct fscrypt_inode_info *ci = fscrypt_get_inode_info(inode);
/*
* If ci is NULL, then the inode doesn't have an encryption key set up
@@ -794,13 +805,14 @@ int fscrypt_drop_inode(struct inode *inode)
return 0;
/*
- * Note: since we aren't holding the key semaphore, the result here can
+ * We can't take ->mk_sem here, since this runs in atomic context.
+ * Therefore, ->mk_present can change concurrently, and our result may
* immediately become outdated. But there's no correctness problem with
* unnecessarily evicting. Nor is there a correctness problem with not
* evicting while iput() is racing with the key being removed, since
* then the thread removing the key will either evict the inode itself
* or will correctly detect that it wasn't evicted due to the race.
*/
- return !is_master_key_secret_present(&ci->ci_master_key->mk_secret);
+ return !READ_ONCE(ci->ci_master_key->mk_present);
}
EXPORT_SYMBOL_GPL(fscrypt_drop_inode);
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-30 05:21:25 +0300