• Tyler Hicks's avatar
    eCryptfs: Make all miscdev functions use daemon ptr in file private_data · 2ecaf55d
    Tyler Hicks authored
    Now that a pointer to a valid struct ecryptfs_daemon is stored in the
    private_data of an opened /dev/ecryptfs file, the remaining miscdev
    functions can utilize the pointer rather than looking up the
    ecryptfs_daemon at the beginning of each operation.
    
    The security model of /dev/ecryptfs is simplified a little bit with this
    patch. Upon opening /dev/ecryptfs, a per-user ecryptfs_daemon is
    registered. Another daemon cannot be registered for that user until the
    last file reference is released. During the lifetime of the
    ecryptfs_daemon, access checks are not performed on the /dev/ecryptfs
    operations because it is assumed that the application securely handles
    the opened file descriptor and does not unintentionally leak it to
    processes that are not trusted.
    Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
    Cc: Sasha Levin <levinsasha928@gmail.com>
    2ecaf55d
miscdev.c 15 KB