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| author | Daniel Rosenberg <drosen@google.com> | 2021-03-19 07:34:13 +0000 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2021-04-05 22:04:20 -0400 |
| commit | 471fbbea7ff7061b2d6474665cb5a2ceb4fd6500 (patch) | |
| tree | cd425ef9c0fcf3a5ebcdb5b5a81b2111a063ead0 /fs/ext4/sysfs.c | |
| parent | 400086d7c11327cfe1b1aa4487adceb41e82b4df (diff) | |
| download | linux-471fbbea7ff7061b2d6474665cb5a2ceb4fd6500.tar.gz linux-471fbbea7ff7061b2d6474665cb5a2ceb4fd6500.tar.bz2 linux-471fbbea7ff7061b2d6474665cb5a2ceb4fd6500.zip | |
ext4: handle casefolding with encryption
This adds support for encryption with casefolding.
Since the name on disk is case preserving, and also encrypted, we can no
longer just recompute the hash on the fly. Additionally, to avoid
leaking extra information from the hash of the unencrypted name, we use
siphash via an fscrypt v2 policy.
The hash is stored at the end of the directory entry for all entries
inside of an encrypted and casefolded directory apart from those that
deal with '.' and '..'. This way, the change is backwards compatible
with existing ext4 filesystems.
[ Changed to advertise this feature via the file:
/sys/fs/ext4/features/encrypted_casefold -- TYT ]
Signed-off-by: Daniel Rosenberg <drosen@google.com>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Link: https://lore.kernel.org/r/20210319073414.1381041-2-drosen@google.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/sysfs.c')
| -rw-r--r-- | fs/ext4/sysfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index a3d08276d441..7367ba406e01 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -313,6 +313,7 @@ EXT4_ATTR_FEATURE(verity); #endif EXT4_ATTR_FEATURE(metadata_csum_seed); EXT4_ATTR_FEATURE(fast_commit); +EXT4_ATTR_FEATURE(encrypted_casefold); static struct attribute *ext4_feat_attrs[] = { ATTR_LIST(lazy_itable_init), @@ -330,6 +331,7 @@ static struct attribute *ext4_feat_attrs[] = { #endif ATTR_LIST(metadata_csum_seed), ATTR_LIST(fast_commit), + ATTR_LIST(encrypted_casefold), NULL, }; ATTRIBUTE_GROUPS(ext4_feat); |