fscrypt: switch fscrypt_do_sha256() to use the SHA-256 library

fscrypt_do_sha256() is only used for hashing encrypted filenames to
create no-key tokens, which isn't performance-critical.  Therefore a C
implementation of SHA-256 is sufficient.

Also, the logic to create no-key tokens is always potentially needed.
This differs from fscrypt's other dependencies on crypto API algorithms,
which are conditionally needed depending on what encryption policies
userspace is using.  Therefore, for fscrypt there isn't much benefit to
allowing SHA-256 to be a loadable module.

So, make fscrypt_do_sha256() use the SHA-256 library instead of the
crypto_shash API.  This is much simpler, since it avoids having to
implement one-time-init (which is hard to do correctly, and in fact was
implemented incorrectly) and handle failures to allocate the
crypto_shash object.

Fixes: edc440e3d27f ("fscrypt: improve format of no-key names")
Cc: Daniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20200721225920.114347-2-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig
index f1f11a6..a5f5c30 100644 (file)
--- a/fs/crypto/Kconfig
+++ b/fs/crypto/Kconfig
@@ -4,6 +4,7 @@ config FS_ENCRYPTION
        select CRYPTO
        select CRYPTO_HASH
        select CRYPTO_SKCIPHER
+       select CRYPTO_LIB_SHA256
        select KEYS
        help
          Enable encryption of files and directories.  This
@@ -21,7 +22,6 @@ config FS_ENCRYPTION_ALGS
        select CRYPTO_CTS
        select CRYPTO_ECB
        select CRYPTO_HMAC
-       select CRYPTO_SHA256
        select CRYPTO_SHA512
        select CRYPTO_XTS
 

diff --git a/fs/crypto/fname.c b/fs/crypto/fname.c
index d828e3d..011830f 100644 (file)
--- a/fs/crypto/fname.c
+++ b/fs/crypto/fname.c
@@ -61,30 +61,13 @@ struct fscrypt_nokey_name {
  */
 #define FSCRYPT_NOKEY_NAME_MAX offsetofend(struct fscrypt_nokey_name, sha256)
 
-static struct crypto_shash *sha256_hash_tfm;
-
-static int fscrypt_do_sha256(const u8 *data, unsigned int data_len, u8 *result)
+static void fscrypt_do_sha256(const u8 *data, unsigned int data_len, u8 *result)
 {
-       struct crypto_shash *tfm = READ_ONCE(sha256_hash_tfm);
-
-       if (unlikely(!tfm)) {
-               struct crypto_shash *prev_tfm;
-
-               tfm = crypto_alloc_shash("sha256", 0, 0);
-               if (IS_ERR(tfm)) {
-                       fscrypt_err(NULL,
-                                   "Error allocating SHA-256 transform: %ld",
-                                   PTR_ERR(tfm));
-                       return PTR_ERR(tfm);
-               }
-               prev_tfm = cmpxchg(&sha256_hash_tfm, NULL, tfm);
-               if (prev_tfm) {
-                       crypto_free_shash(tfm);
-                       tfm = prev_tfm;
-               }
-       }
+       struct sha256_state sctx;
 
-       return crypto_shash_tfm_digest(tfm, data, data_len, result);
+       sha256_init(&sctx);
+       sha256_update(&sctx, data, data_len);
+       sha256_final(&sctx, result);
 }
 
 static inline bool fscrypt_is_dot_dotdot(const struct qstr *str)
@@ -349,7 +332,6 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode,
        const struct qstr qname = FSTR_TO_QSTR(iname);
        struct fscrypt_nokey_name nokey_name;
        u32 size; /* size of the unencoded no-key name */
-       int err;
 
        if (fscrypt_is_dot_dotdot(&qname)) {
                oname->name[0] = '.';
@@ -387,11 +369,9 @@ int fscrypt_fname_disk_to_usr(const struct inode *inode,
        } else {
                memcpy(nokey_name.bytes, iname->name, sizeof(nokey_name.bytes));
                /* Compute strong hash of remaining part of name. */
-               err = fscrypt_do_sha256(&iname->name[sizeof(nokey_name.bytes)],
-                                       iname->len - sizeof(nokey_name.bytes),
-                                       nokey_name.sha256);
-               if (err)
-                       return err;
+               fscrypt_do_sha256(&iname->name[sizeof(nokey_name.bytes)],
+                                 iname->len - sizeof(nokey_name.bytes),
+                                 nokey_name.sha256);
                size = FSCRYPT_NOKEY_NAME_MAX;
        }
        oname->len = base64_encode((const u8 *)&nokey_name, size, oname->name);
@@ -530,9 +510,8 @@ bool fscrypt_match_name(const struct fscrypt_name *fname,
                return false;
        if (memcmp(de_name, nokey_name->bytes, sizeof(nokey_name->bytes)))
                return false;
-       if (fscrypt_do_sha256(&de_name[sizeof(nokey_name->bytes)],
-                             de_name_len - sizeof(nokey_name->bytes), sha256))
-               return false;
+       fscrypt_do_sha256(&de_name[sizeof(nokey_name->bytes)],
+                         de_name_len - sizeof(nokey_name->bytes), sha256);
        return !memcmp(sha256, nokey_name->sha256, sizeof(sha256));
 }
 EXPORT_SYMBOL_GPL(fscrypt_match_name);