fscrypt: relax Kconfig dependencies for crypto API algorithms

Even if FS encryption has strict functional dependencies on various
crypto algorithms and chaining modes. those dependencies could potentially
be satisified by other implementations than the generic ones, and no link
time dependency exists on the 'depends on' claused defined by
CONFIG_FS_ENCRYPTION_ALGS.

So let's relax these clauses to 'imply', so that the default behavior
is still to pull in those generic algorithms, but in a way that permits
them to be disabled again in Kconfig.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/fs/crypto/Kconfig b/fs/crypto/Kconfig
index a5f5c30368a203d5c1f901ac00cdf1093ba4834f..2d0c8922f63506ce99f4813cc1c0bd314adeba0f 100644 (file)
--- a/fs/crypto/Kconfig
+++ b/fs/crypto/Kconfig
@@ -14,16 +14,30 @@ config FS_ENCRYPTION
          F2FS and UBIFS make use of this feature.
 
 # Filesystems supporting encryption must select this if FS_ENCRYPTION.  This
-# allows the algorithms to be built as modules when all the filesystems are.
+# allows the algorithms to be built as modules when all the filesystems are,
+# whereas selecting them from FS_ENCRYPTION would force them to be built-in.
+#
+# Note: this option only pulls in the algorithms that filesystem encryption
+# needs "by default".  If userspace will use "non-default" encryption modes such
+# as Adiantum encryption, then those other modes need to be explicitly enabled
+# in the crypto API; see Documentation/filesystems/fscrypt.rst for details.
+#
+# Also note that this option only pulls in the generic implementations of the
+# algorithms, not any per-architecture optimized implementations.  It is
+# strongly recommended to enable optimized implementations too.  It is safe to
+# disable these generic implementations if corresponding optimized
+# implementations will always be available too; for this reason, these are soft
+# dependencies ('imply' rather than 'select').  Only disable these generic
+# implementations if you're sure they will never be needed, though.
 config FS_ENCRYPTION_ALGS
        tristate
-       select CRYPTO_AES
-       select CRYPTO_CBC
-       select CRYPTO_CTS
-       select CRYPTO_ECB
-       select CRYPTO_HMAC
-       select CRYPTO_SHA512
-       select CRYPTO_XTS
+       imply CRYPTO_AES
+       imply CRYPTO_CBC
+       imply CRYPTO_CTS
+       imply CRYPTO_ECB
+       imply CRYPTO_HMAC
+       imply CRYPTO_SHA512
+       imply CRYPTO_XTS
 
 config FS_ENCRYPTION_INLINE_CRYPT
        bool "Enable fscrypt to use inline crypto"