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| author |   Satya Tangirala <satyat@google.com> | 2020-07-02 01:56:05 +0000 |
|---|---|---|
| committer |   Eric Biggers <ebiggers@google.com> | 2020-07-08 10:29:30 -0700 |
| commit | 5fee36095cda45d34555aed3a2e8973b80cd6bf8 (patch) | |
| tree | 631af4525c5cca73b935c4ff495813576de6614f /Documentation/filesystems | |
| parent | fs: introduce SB_INLINECRYPT (diff) | |
| download | linux-dev-5fee36095cda45d34555aed3a2e8973b80cd6bf8.tar.xz linux-dev-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 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/fscrypt.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst index f517af8ec11c..f5d8b0303ddf 100644 --- a/Documentation/filesystems/fscrypt.rst +++ b/Documentation/filesystems/fscrypt.rst @@ -1255,6 +1255,7 @@ f2fs encryption using `kvm-xfstests <https://github.com/tytso/xfstests-bld/blob/master/Documentation/kvm-quickstart.md>`_:: kvm-xfstests -c ext4,f2fs -g encrypt + kvm-xfstests -c ext4,f2fs -g encrypt -m inlinecrypt UBIFS encryption can also be tested this way, but it should be done in a separate command, and it takes some time for kvm-xfstests to set up @@ -1276,6 +1277,7 @@ This tests the encrypted I/O paths more thoroughly. To do this with kvm-xfstests, use the "encrypt" filesystem configuration:: kvm-xfstests -c ext4/encrypt,f2fs/encrypt -g auto + kvm-xfstests -c ext4/encrypt,f2fs/encrypt -g auto -m inlinecrypt Because this runs many more tests than "-g encrypt" does, it takes much longer to run; so also consider using `gce-xfstests @@ -1283,3 +1285,4 @@ much longer to run; so also consider using `gce-xfstests instead of kvm-xfstests:: gce-xfstests -c ext4/encrypt,f2fs/encrypt -g auto + gce-xfstests -c ext4/encrypt,f2fs/encrypt -g auto -m inlinecrypt |