diff options
Diffstat (limited to 'fs/verity/fsverity_private.h')
-rw-r--r-- | fs/verity/fsverity_private.h | 54 |
1 files changed, 52 insertions, 2 deletions
diff --git a/fs/verity/fsverity_private.h b/fs/verity/fsverity_private.h index 9697aaebb5dc..c79746ff335e 100644 --- a/fs/verity/fsverity_private.h +++ b/fs/verity/fsverity_private.h @@ -15,8 +15,7 @@ #define pr_fmt(fmt) "fs-verity: " fmt #include <crypto/sha.h> -#include <linux/fs.h> -#include <uapi/linux/fsverity.h> +#include <linux/fsverity.h> struct ahash_request; @@ -59,6 +58,40 @@ struct merkle_tree_params { u64 level_start[FS_VERITY_MAX_LEVELS]; }; +/** + * fsverity_info - cached verity metadata for an inode + * + * When a verity file is first opened, an instance of this struct is allocated + * and stored in ->i_verity_info; it remains until the inode is evicted. It + * caches information about the Merkle tree that's needed to efficiently verify + * data read from the file. It also caches the file measurement. The Merkle + * tree pages themselves are not cached here, but the filesystem may cache them. + */ +struct fsverity_info { + struct merkle_tree_params tree_params; + u8 root_hash[FS_VERITY_MAX_DIGEST_SIZE]; + u8 measurement[FS_VERITY_MAX_DIGEST_SIZE]; + const struct inode *inode; +}; + +/* + * Merkle tree properties. The file measurement is the hash of this structure. + */ +struct fsverity_descriptor { + __u8 version; /* must be 1 */ + __u8 hash_algorithm; /* Merkle tree hash algorithm */ + __u8 log_blocksize; /* log2 of size of data and tree blocks */ + __u8 salt_size; /* size of salt in bytes; 0 if none */ + __le32 sig_size; /* reserved, must be 0 */ + __le64 data_size; /* size of file the Merkle tree is built over */ + __u8 root_hash[64]; /* Merkle tree root hash */ + __u8 salt[32]; /* salt prepended to each hashed block */ + __u8 __reserved[144]; /* must be 0's */ +}; + +/* Arbitrary limit to bound the kmalloc() size. Can be changed. */ +#define FS_VERITY_MAX_DESCRIPTOR_SIZE 16384 + /* hash_algs.c */ extern struct fsverity_hash_alg fsverity_hash_algs[]; @@ -85,4 +118,21 @@ fsverity_msg(const struct inode *inode, const char *level, #define fsverity_err(inode, fmt, ...) \ fsverity_msg((inode), KERN_ERR, fmt, ##__VA_ARGS__) +/* open.c */ + +int fsverity_init_merkle_tree_params(struct merkle_tree_params *params, + const struct inode *inode, + unsigned int hash_algorithm, + unsigned int log_blocksize, + const u8 *salt, size_t salt_size); + +struct fsverity_info *fsverity_create_info(const struct inode *inode, + const void *desc, size_t desc_size); + +void fsverity_set_info(struct inode *inode, struct fsverity_info *vi); + +void fsverity_free_info(struct fsverity_info *vi); + +int __init fsverity_init_info_cache(void); + #endif /* _FSVERITY_PRIVATE_H */ |