On Fri, Oct 21, 2016 at 02:48:41PM +0200, Richard Weinberger wrote:
> Starting with version 5 the following properties change:
> - UBIFS_FLG_DOUBLE_HASH is mandatory
> - UBIFS_FLG_ENCRYPTION is optional but depdens on UBIFS_FLG_DOUBLE_HASH
> - Filesystems with unknown super block flags will be rejected, this
> allows us in future to add new features without raising the UBIFS
> write version.
>
> Signed-off-by: Richard Weinberger <richard@xxxxxx>
> ---
> fs/ubifs/sb.c | 17 +++++++++++++++++
> fs/ubifs/ubifs-media.h | 4 +++-
> 2 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
> index 54cef70ea16f..7f1ead29e727 100644
> --- a/fs/ubifs/sb.c
> +++ b/fs/ubifs/sb.c
> @@ -466,6 +466,16 @@ static int validate_sb(struct ubifs_info *c, struct ubifs_sb_node *sup)
> goto failed;
> }
>
> + if (!c->double_hash && c->fmt_version >= 5) {
> + err = 16;
> + goto failed;
> + }
> +
> + if (c->encrypted && c->fmt_version < 5) {
> + err = 17;
> + goto failed;
> + }
> +
> return 0;
>
> failed:
> @@ -624,6 +634,13 @@ int ubifs_read_superblock(struct ubifs_info *c)
> c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH);
> c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION);
>
> + if ((sup_flags & ~UBIFS_FLG_MASK) != 0) {
> + ubifs_err(c, "Unknown feature flags found: %#x",
> + sup_flags & ~UBIFS_FLG_MASK);
> + err = -EINVAL;
> + goto out;
> + }
> +
> #ifndef CONFIG_UBIFS_FS_ENCRYPTION
> if (c->encrypted) {
> ubifs_err(c, "file system contains encrypted files but UBIFS"
> diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
> index bdc7935a5e41..e8c23c9d4f4a 100644
> --- a/fs/ubifs/ubifs-media.h
> +++ b/fs/ubifs/ubifs-media.h
> @@ -46,7 +46,7 @@
> * UBIFS went into mainline kernel with format version 4. The older formats
> * were development formats.
> */
> -#define UBIFS_FORMAT_VERSION 4
> +#define UBIFS_FORMAT_VERSION 5
Alex Cope is working on a fix for file name encryption in ext4 so that
common plaintext prefixes don't result in common ciphertext prefixes.
Older kernels will not be able to read the new file names.
>
> /*
> * Read-only compatibility version. If the UBIFS format is changed, older UBIFS
> @@ -429,6 +429,8 @@ enum {
> UBIFS_FLG_ENCRYPTION = 0x10,
> };
>
> +#define UBIFS_FLG_MASK (UBIFS_FLG_BIGLPT|UBIFS_FLG_SPACE_FIXUP|UBIFS_FLG_DOUBLE_HASH|UBIFS_FLG_ENCRYPTION)
> +
> /**
> * struct ubifs_ch - common header node.
> * @magic: UBIFS node magic number (%UBIFS_NODE_MAGIC)
> --
> 2.7.3
>
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