Description
In the Linux kernel, the following vulnerability has been resolved: ext4: don't enable DAX on new encrypted files Currently, when a new encrypted regular file is created, the call to ext4_set_inode_flags(inode, init=true) in __ext4_new_inode() is made before EXT4_INODE_ENCRYPT is set. As a result, it can set S_DAX if the filesystem is mounted with "-o dax=always". EXT4_INODE_ENCRYPT then actually gets set a bit later in __ext4_new_inode(), when it calls fscrypt_set_context() which calls ext4_set_context(). ext4_set_context() sets EXT4_INODE_ENCRYPT and calls ext4_set_inode_flags(inode, init=false) to set S_ENCRYPTED too. This was intended to clear S_DAX as well. However, this was broken by commit 043546e46dc7 ("fs/ext4: Only change S_DAX on inode load"). This causes data written to the file to bypass encryption, also causing xfstests failures such as generic/548 (when "-o dax=always" is used). Fix this by simplifying the flow by making __ext4_new_inode() set EXT4_INODE_ENCRYPT earlier. This makes it take effect in ext4_set_inode_flags(inode, init=true), making S_DAX never be set. Similarly, make EXT4_STATE_MAY_INLINE_DATA never be set in the first place on new encrypted inodes. Then it doesn't need to be cleared. As a result of these simplifications, ext4_set_context() no longer needs to change inode flags or state when 'handle != NULL'. Remove that too.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < add98959b220935b243170214c787bc03044a44daffected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < f53b325068bca0b238c3e0d2eb7de9b1f2268cabaffected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < 5959cad3cfa852ec07bbdaf9c17f4838a94a8e6caffected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < a13f61ba9b2a7a4ff1f140949ccfad23c5313757affected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < ed1cd834da65db127f1c30ff67e78f14825a06c1affected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < 458776af0061afec1014cb3cd0061e282e482e83affected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < 3392391b363a63ebb531d45318a729b1c998565baffected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < e27bae352158c007143d5bb50f3af33a177c0a37affected043546e46dc70c25ff7e2cf6d09cbb0424fc9978 to < da32af420d6d466e247c43ac0b829edeac7ae0adaffected
Linux Linux
Default version status: affected
5.8affected0 to < 5.8unaffected5.10.269 to ≤ 5.10.*unaffected5.15.220 to ≤ 5.15.*unaffected6.1.187 to ≤ 6.1.*unaffected6.6.156 to ≤ 6.6.*unaffected6.12.108 to ≤ 6.12.*unaffected6.18.47 to ≤ 6.18.*unaffected7.1.11 to ≤ 7.1.*unaffected7.2.1 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/add98959b220935b243170214c787bc03044a44d ↗
- https://git.kernel.org/stable/c/f53b325068bca0b238c3e0d2eb7de9b1f2268cab ↗
- https://git.kernel.org/stable/c/5959cad3cfa852ec07bbdaf9c17f4838a94a8e6c ↗
- https://git.kernel.org/stable/c/a13f61ba9b2a7a4ff1f140949ccfad23c5313757 ↗
- https://git.kernel.org/stable/c/ed1cd834da65db127f1c30ff67e78f14825a06c1 ↗
- https://git.kernel.org/stable/c/458776af0061afec1014cb3cd0061e282e482e83 ↗
- https://git.kernel.org/stable/c/3392391b363a63ebb531d45318a729b1c998565b ↗
- https://git.kernel.org/stable/c/e27bae352158c007143d5bb50f3af33a177c0a37 ↗
- https://git.kernel.org/stable/c/da32af420d6d466e247c43ac0b829edeac7ae0ad ↗