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authorSatya Tangirala <satyat@google.com>2020-07-02 03:56:05 +0200
committerEric Biggers <ebiggers@google.com>2020-07-08 19:29:30 +0200
commit5fee36095cda45d34555aed3a2e8973b80cd6bf8 (patch)
tree631af4525c5cca73b935c4ff495813576de6614f /fs/crypto/Makefile
parentfs: introduce SB_INLINECRYPT (diff)
downloadlinux-5fee36095cda45d34555aed3a2e8973b80cd6bf8.tar.xz
linux-5fee36095cda45d34555aed3a2e8973b80cd6bf8.zip
fscrypt: add inline encryption support
Add support for inline encryption to fs/crypto/. With "inline encryption", the block layer handles the decryption/encryption as part of the bio, instead of the filesystem doing the crypto itself via Linux's crypto API. This model is needed in order to take advantage of the inline encryption hardware present on most modern mobile SoCs. To use inline encryption, the filesystem needs to be mounted with '-o inlinecrypt'. Blk-crypto will then be used instead of the traditional filesystem-layer crypto whenever possible to encrypt the contents of any encrypted files in that filesystem. Fscrypt still provides the key and IV to use, and the actual ciphertext on-disk is still the same; therefore it's testable using the existing fscrypt ciphertext verification tests. Note that since blk-crypto has a fallback to Linux's crypto API, and also supports all the encryption modes currently supported by fscrypt, this feature is usable and testable even without actual inline encryption hardware. Per-filesystem changes will be needed to set encryption contexts when submitting bios and to implement the 'inlinecrypt' mount option. This patch just adds the common code. Signed-off-by: Satya Tangirala <satyat@google.com> Reviewed-by: Jaegeuk Kim <jaegeuk@kernel.org> Reviewed-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Theodore Ts'o <tytso@mit.edu> Link: https://lore.kernel.org/r/20200702015607.1215430-3-satyat@google.com Co-developed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/crypto/Makefile')
-rw-r--r--fs/crypto/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/crypto/Makefile b/fs/crypto/Makefile
index 232e2bb5a337..652c7180ec6d 100644
--- a/fs/crypto/Makefile
+++ b/fs/crypto/Makefile
@@ -11,3 +11,4 @@ fscrypto-y := crypto.o \
policy.o
fscrypto-$(CONFIG_BLOCK) += bio.o
+fscrypto-$(CONFIG_FS_ENCRYPTION_INLINE_CRYPT) += inline_crypt.o