On Sat, Dec 08, 2018 at 12:21:42PM +0530, Chandan Rajendra wrote:
> In order to have a common code base for fsverity "post read" processing
> for all filesystems which support fsverity, this commit removes
> filesystem specific build config option (e.g. CONFIG_EXT4_FS_VERITY)
> and replaces it with a build option (i.e. CONFIG_FS_VERITY) whose
> value affects all the filesystems making use of fsverity.
>
> Signed-off-by: Chandan Rajendra <chan...@linux.vnet.ibm.com>
Reviewed-by: Eric Biggers <ebigg...@google.com>
> ---
> Documentation/filesystems/fsverity.rst | 4 ++--
> fs/ext4/Kconfig | 20 --------------------
> fs/ext4/ext4.h | 2 --
> fs/ext4/readpage.c | 4 ++--
> fs/ext4/super.c | 6 +++---
> fs/ext4/sysfs.c | 4 ++--
> fs/f2fs/Kconfig | 20 --------------------
> fs/f2fs/data.c | 2 +-
> fs/f2fs/f2fs.h | 2 --
> fs/f2fs/super.c | 6 +++---
> fs/f2fs/sysfs.c | 4 ++--
> fs/verity/Kconfig | 3 ++-
> fs/verity/fsverity_private.h | 1 -
> include/linux/fs.h | 4 ++--
> include/linux/fsverity.h | 7 +++----
> 15 files changed, 22 insertions(+), 67 deletions(-)
>
> diff --git a/Documentation/filesystems/fsverity.rst
> b/Documentation/filesystems/fsverity.rst
> index d633fc0567bd..bb208dad10d9 100644
> --- a/Documentation/filesystems/fsverity.rst
> +++ b/Documentation/filesystems/fsverity.rst
> @@ -279,7 +279,7 @@ ext4
>
> ext4 supports fs-verity since kernel version TODO.
>
> -CONFIG_EXT4_FS_VERITY must be enabled in the kernel config. Also, the
> +CONFIG_FS_VERITY must be enabled in the kernel config. Also, the
> filesystem must have been formatted with ``-O verity``, or had
> ``tune2fs -O verity`` run on it. These require e2fsprogs v1.44.4-2 or
> later. This e2fsprogs version is also required for e2fsck to
> @@ -306,7 +306,7 @@ f2fs
>
> f2fs supports fs-verity since kernel version TODO.
>
> -CONFIG_F2FS_FS_VERITY must be enabled in the kernel config. Also, the
> +CONFIG_FS_VERITY must be enabled in the kernel config. Also, the
> filesystem must have been formatted with ``-O verity``. This requires
> f2fs-tools v1.11.0 or later.
>
> diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
> index e1002bbf35bf..031e5a82d556 100644
> --- a/fs/ext4/Kconfig
> +++ b/fs/ext4/Kconfig
> @@ -96,26 +96,6 @@ config EXT4_FS_SECURITY
> If you are not using a security module that requires using
> extended attributes for file security labels, say N.
>
> -config EXT4_FS_VERITY
> - bool "Ext4 Verity"
> - depends on EXT4_FS
> - select FS_VERITY
> - help
> - This option enables fs-verity for ext4. fs-verity is the
> - dm-verity mechanism implemented at the file level. Userspace
> - can append a Merkle tree (hash tree) to a file, then enable
> - fs-verity on the file. ext4 will then transparently verify
> - any data read from the file against the Merkle tree. The file
> - is also made read-only.
> -
> - This serves as an integrity check, but the availability of the
> - Merkle tree root hash also allows efficiently supporting
> - various use cases where normally the whole file would need to
> - be hashed at once, such as auditing and authenticity
> - verification (appraisal).
> -
> - If unsure, say N.
> -
> config EXT4_DEBUG
> bool "EXT4 debugging support"
> depends on EXT4_FS
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 64bf9fb7ef18..bff8d639dd0c 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -41,8 +41,6 @@
> #endif
>
> #include <linux/fscrypt.h>
> -
> -#define __FS_HAS_VERITY IS_ENABLED(CONFIG_EXT4_FS_VERITY)
> #include <linux/fsverity.h>
>
> #include <linux/compiler.h>
> diff --git a/fs/ext4/readpage.c b/fs/ext4/readpage.c
> index 2c037df629dd..8717ac0a5bb2 100644
> --- a/fs/ext4/readpage.c
> +++ b/fs/ext4/readpage.c
> @@ -158,7 +158,7 @@ static struct bio_post_read_ctx
> *get_bio_post_read_ctx(struct inode *inode,
>
> if (IS_ENCRYPTED(inode) && S_ISREG(inode->i_mode))
> post_read_steps |= 1 << STEP_DECRYPT;
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> if (inode->i_verity_info != NULL &&
> (index < ((i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT)))
> post_read_steps |= 1 << STEP_VERITY;
> @@ -205,7 +205,7 @@ static void mpage_end_io(struct bio *bio)
>
> static inline loff_t ext4_readpage_limit(struct inode *inode)
> {
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> if (IS_VERITY(inode)) {
> if (inode->i_verity_info)
> /* limit to end of metadata region */
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 35ed3c48f8d2..0d169de59f76 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1316,7 +1316,7 @@ static const struct fscrypt_operations ext4_cryptops = {
> };
> #endif
>
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> static int ext4_set_verity(struct inode *inode, loff_t data_i_size)
> {
> int err;
> @@ -1402,7 +1402,7 @@ static const struct fsverity_operations ext4_verityops
> = {
> .set_verity = ext4_set_verity,
> .get_metadata_end = ext4_get_metadata_end,
> };
> -#endif /* CONFIG_EXT4_FS_VERITY */
> +#endif /* CONFIG_FS_VERITY */
>
> #ifdef CONFIG_QUOTA
> static const char * const quotatypes[] = INITQFNAMES;
> @@ -4235,7 +4235,7 @@ static int ext4_fill_super(struct super_block *sb, void
> *data, int silent)
> #ifdef CONFIG_FS_ENCRYPTION
> sb->s_cop = &ext4_cryptops;
> #endif
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> sb->s_vop = &ext4_verityops;
> #endif
> #ifdef CONFIG_QUOTA
> diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
> index 8bc915452a38..6fa0f47c3180 100644
> --- a/fs/ext4/sysfs.c
> +++ b/fs/ext4/sysfs.c
> @@ -227,7 +227,7 @@ EXT4_ATTR_FEATURE(meta_bg_resize);
> #ifdef CONFIG_FS_ENCRYPTION
> EXT4_ATTR_FEATURE(encryption);
> #endif
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> EXT4_ATTR_FEATURE(verity);
> #endif
> EXT4_ATTR_FEATURE(metadata_csum_seed);
> @@ -239,7 +239,7 @@ static struct attribute *ext4_feat_attrs[] = {
> #ifdef CONFIG_FS_ENCRYPTION
> ATTR_LIST(encryption),
> #endif
> -#ifdef CONFIG_EXT4_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> ATTR_LIST(verity),
> #endif
> ATTR_LIST(metadata_csum_seed),
> diff --git a/fs/f2fs/Kconfig b/fs/f2fs/Kconfig
> index a5a1a381fcf1..e57cc754d543 100644
> --- a/fs/f2fs/Kconfig
> +++ b/fs/f2fs/Kconfig
> @@ -71,26 +71,6 @@ config F2FS_CHECK_FS
>
> If you want to improve the performance, say N.
>
> -config F2FS_FS_VERITY
> - bool "F2FS Verity"
> - depends on F2FS_FS
> - select FS_VERITY
> - help
> - This option enables fs-verity for f2fs. fs-verity is the
> - dm-verity mechanism implemented at the file level. Userspace
> - can append a Merkle tree (hash tree) to a file, then enable
> - fs-verity on the file. f2fs will then transparently verify
> - any data read from the file against the Merkle tree. The file
> - is also made read-only.
> -
> - This serves as an integrity check, but the availability of the
> - Merkle tree root hash also allows efficiently supporting
> - various use cases where normally the whole file would need to
> - be hashed at once, such as auditing and authenticity
> - verification (appraisal).
> -
> - If unsure, say N.
> -
> config F2FS_IO_TRACE
> bool "F2FS IO tracer"
> depends on F2FS_FS
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 844ec573263e..83b59b985894 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -610,7 +610,7 @@ static struct bio *f2fs_grab_read_bio(struct inode
> *inode, block_t blkaddr,
>
> if (f2fs_encrypted_file(inode))
> post_read_steps |= 1 << STEP_DECRYPT;
> -#ifdef CONFIG_F2FS_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> if (inode->i_verity_info != NULL &&
> (first_idx < ((i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT)))
> post_read_steps |= 1 << STEP_VERITY;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 54bd93c7b630..7161918042e7 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -25,8 +25,6 @@
> #include <crypto/hash.h>
>
> #include <linux/fscrypt.h>
> -
> -#define __FS_HAS_VERITY IS_ENABLED(CONFIG_F2FS_FS_VERITY)
> #include <linux/fsverity.h>
>
> #ifdef CONFIG_F2FS_CHECK_FS
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 73320202bd01..4a67b901eefc 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2197,7 +2197,7 @@ static const struct fscrypt_operations f2fs_cryptops = {
> };
> #endif
>
> -#ifdef CONFIG_F2FS_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> static int f2fs_set_verity(struct inode *inode, loff_t data_i_size)
> {
> int err;
> @@ -2223,7 +2223,7 @@ static const struct fsverity_operations f2fs_verityops
> = {
> .set_verity = f2fs_set_verity,
> .get_metadata_end = f2fs_get_metadata_end,
> };
> -#endif /* CONFIG_F2FS_FS_VERITY */
> +#endif /* CONFIG_FS_VERITY */
>
> static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
> u64 ino, u32 generation)
> @@ -3147,7 +3147,7 @@ static int f2fs_fill_super(struct super_block *sb, void
> *data, int silent)
> #ifdef CONFIG_FS_ENCRYPTION
> sb->s_cop = &f2fs_cryptops;
> #endif
> -#ifdef CONFIG_F2FS_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> sb->s_vop = &f2fs_verityops;
> #endif
> sb->s_xattr = f2fs_xattr_handlers;
> diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
> index 737677655bc0..949e6d87f4e3 100644
> --- a/fs/f2fs/sysfs.c
> +++ b/fs/f2fs/sysfs.c
> @@ -444,7 +444,7 @@ F2FS_FEATURE_RO_ATTR(flexible_inline_xattr,
> FEAT_FLEXIBLE_INLINE_XATTR);
> F2FS_FEATURE_RO_ATTR(quota_ino, FEAT_QUOTA_INO);
> F2FS_FEATURE_RO_ATTR(inode_crtime, FEAT_INODE_CRTIME);
> F2FS_FEATURE_RO_ATTR(lost_found, FEAT_LOST_FOUND);
> -#ifdef CONFIG_F2FS_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> F2FS_FEATURE_RO_ATTR(verity, FEAT_VERITY);
> #endif
> F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
> @@ -507,7 +507,7 @@ static struct attribute *f2fs_feat_attrs[] = {
> ATTR_LIST(quota_ino),
> ATTR_LIST(inode_crtime),
> ATTR_LIST(lost_found),
> -#ifdef CONFIG_F2FS_FS_VERITY
> +#ifdef CONFIG_FS_VERITY
> ATTR_LIST(verity),
> #endif
> ATTR_LIST(sb_checksum),
> diff --git a/fs/verity/Kconfig b/fs/verity/Kconfig
> index a7470a2e4892..6d9437a432cd 100644
> --- a/fs/verity/Kconfig
> +++ b/fs/verity/Kconfig
> @@ -1,5 +1,5 @@
> config FS_VERITY
> - tristate "FS Verity (read-only file-based authenticity protection)"
> + bool "FS Verity (read-only file-based authenticity protection)"
> select CRYPTO
> # SHA-256 is selected as it's intended to be the default hash algorithm.
> # To avoid bloat, other wanted algorithms must be selected explicitly.
> @@ -23,6 +23,7 @@ config FS_VERITY
> the contents may actually be needed. Also, fs-verity verifies
> data each time it is paged back in, which provides better
> protection against malicious disks vs. an ahead-of-time hash.
> + Currently Ext4 and F2FS make use of this feature.
>
> If unsure, say N.
>
> diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h
> index 4b39d0a5544b..a7acb98ac42e 100644
> --- a/fs/verity/fsverity_private.h
> +++ b/fs/verity/fsverity_private.h
> @@ -15,7 +15,6 @@
> #define pr_fmt(fmt) "fs-verity: " fmt
>
> #include <crypto/sha.h>
> -#define __FS_HAS_VERITY 1
> #include <linux/fsverity.h>
>
> /*
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index de602d9f8d0e..1583b861a225 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -704,7 +704,7 @@ struct inode {
> struct fscrypt_info *i_crypt_info;
> #endif
>
> -#if IS_ENABLED(CONFIG_FS_VERITY)
> +#ifdef CONFIG_FS_VERITY
> struct fsverity_info *i_verity_info;
> #endif
>
> @@ -1407,7 +1407,7 @@ struct super_block {
> #ifdef CONFIG_FS_ENCRYPTION
> const struct fscrypt_operations *s_cop;
> #endif
> -#if IS_ENABLED(CONFIG_FS_VERITY)
> +#ifdef CONFIG_FS_VERITY
> const struct fsverity_operations *s_vop;
> #endif
> struct hlist_bl_head s_roots; /* alternate root dentries for
> NFS */
> diff --git a/include/linux/fsverity.h b/include/linux/fsverity.h
> index c30c4f6ed411..ea8c418bd7d5 100644
> --- a/include/linux/fsverity.h
> +++ b/include/linux/fsverity.h
> @@ -19,8 +19,7 @@ struct fsverity_operations {
> int (*get_metadata_end)(struct inode *inode, loff_t *metadata_end_ret);
> };
>
> -#if __FS_HAS_VERITY
> -
> +#ifdef CONFIG_FS_VERITY
> /* ioctl.c */
> extern int fsverity_ioctl_enable(struct file *filp, const void __user *arg);
> extern int fsverity_ioctl_measure(struct file *filp, void __user *arg);
> @@ -42,7 +41,7 @@ static inline bool fsverity_check_hole(struct inode *inode,
> struct page *page)
> return inode->i_verity_info == NULL || fsverity_verify_page(page);
> }
>
> -#else /* !__FS_HAS_VERITY */
> +#else /* ! CONFIG_FS_VERITY */
>
> /* ioctl.c */
>
> @@ -107,6 +106,6 @@ static inline bool fsverity_check_hole(struct inode
> *inode, struct page *page)
> return true;
> }
>
> -#endif /* !__FS_HAS_VERITY */
> +#endif /* ! CONFIG_FS_VERITY */
>
> #endif /* _LINUX_FSVERITY_H */
> --
> 2.19.1
>
