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fsverity: constify fsverity_hash_alg

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Now that fsverity_hash_alg doesn't have an embedded mempool, it can be
'const' almost everywhere.  Add it.

Link: https://lore.kernel.org/r/20230604022348.48658-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
This commit is contained in:
Eric Biggers 2023-06-03 19:23:48 -07:00
parent 8fcd94add6
commit 32ab3c5e62
3 changed files with 11 additions and 11 deletions
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10
fs/verity/fsverity_private.h
View File

@ -33,7 +33,7 @@ struct fsverity_hash_alg {
/* Merkle tree parameters: hash algorithm, initial hash state, and topology */
struct merkle_tree_params {
struct fsverity_hash_alg *hash_alg; /* the hash algorithm */
const struct fsverity_hash_alg *hash_alg; /* the hash algorithm */
const u8 *hashstate; /* initial hash state or NULL */
unsigned int digest_size; /* same as hash_alg->digest_size */
unsigned int block_size; /* size of data and tree blocks */
@ -79,13 +79,13 @@ struct fsverity_info {
extern struct fsverity_hash_alg fsverity_hash_algs[];
struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
unsigned int num);
const u8 *fsverity_prepare_hash_state(struct fsverity_hash_alg *alg,
const struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
unsigned int num);
const u8 *fsverity_prepare_hash_state(const struct fsverity_hash_alg *alg,
const u8 *salt, size_t salt_size);
int fsverity_hash_block(const struct merkle_tree_params *params,
const struct inode *inode, const void *data, u8 *out);
int fsverity_hash_buffer(struct fsverity_hash_alg *alg,
int fsverity_hash_buffer(const struct fsverity_hash_alg *alg,
const void *data, size_t size, u8 *out);
void __init fsverity_check_hash_algs(void);

8
fs/verity/hash_algs.c
View File

@ -39,8 +39,8 @@ static DEFINE_MUTEX(fsverity_hash_alg_init_mutex);
*
* Return: pointer to the hash alg on success, else an ERR_PTR()
*/
struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
unsigned int num)
const struct fsverity_hash_alg *fsverity_get_hash_alg(const struct inode *inode,
unsigned int num)
{
struct fsverity_hash_alg *alg;
struct crypto_shash *tfm;
@ -108,7 +108,7 @@ out_unlock:
* Return: NULL if the salt is empty, otherwise the kmalloc()'ed precomputed
* initial hash state on success or an ERR_PTR() on failure.
*/
const u8 *fsverity_prepare_hash_state(struct fsverity_hash_alg *alg,
const u8 *fsverity_prepare_hash_state(const struct fsverity_hash_alg *alg,
const u8 *salt, size_t salt_size)
{
u8 *hashstate = NULL;
@ -206,7 +206,7 @@ int fsverity_hash_block(const struct merkle_tree_params *params,
*
* Return: 0 on success, -errno on failure
*/
int fsverity_hash_buffer(struct fsverity_hash_alg *alg,
int fsverity_hash_buffer(const struct fsverity_hash_alg *alg,
const void *data, size_t size, u8 *out)
{
return crypto_shash_tfm_digest(alg->tfm, data, size, out);

4
fs/verity/open.c
View File

@ -32,7 +32,7 @@ int fsverity_init_merkle_tree_params(struct merkle_tree_params *params,
unsigned int log_blocksize,
const u8 *salt, size_t salt_size)
{
struct fsverity_hash_alg *hash_alg;
const struct fsverity_hash_alg *hash_alg;
int err;
u64 blocks;
u64 blocks_in_level[FS_VERITY_MAX_LEVELS];
@ -158,7 +158,7 @@ out_err:
* Compute the file digest by hashing the fsverity_descriptor excluding the
* signature and with the sig_size field set to 0.
*/
static int compute_file_digest(struct fsverity_hash_alg *hash_alg,
static int compute_file_digest(const struct fsverity_hash_alg *hash_alg,
struct fsverity_descriptor *desc,
u8 *file_digest)
{