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dm: Constify struct dm_block_validator

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'struct dm_block_validator' are not modified in these drivers.

Constifying this structure moves some data to a read-only section, so
increase overall security.

On a x86_64, with allmodconfig, as an example:

Before:
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   text	   data	    bss	    dec	    hex	filename
  32047	    920	     16	  32983	   80d7	drivers/md/dm-cache-metadata.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  32075	    896	     16	  32987	   80db	drivers/md/dm-cache-metadata.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
This commit is contained in:
Christophe JAILLET 2024-07-14 09:13:56 +02:00 committed by Mikulas Patocka
parent fb0987682c
commit 0b60be1628
12 changed files with 46 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/md/dm-cache-metadata.c
View File

@ -170,7 +170,7 @@ struct dm_cache_metadata {
*/
#define SUPERBLOCK_CSUM_XOR 9031977
static void sb_prepare_for_write(struct dm_block_validator *v,
static void sb_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
@ -195,7 +195,7 @@ static int check_metadata_version(struct cache_disk_superblock *disk_super)
return 0;
}
static int sb_check(struct dm_block_validator *v,
static int sb_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
@ -228,7 +228,7 @@ static int sb_check(struct dm_block_validator *v,
return check_metadata_version(disk_super);
}
static struct dm_block_validator sb_validator = {
static const struct dm_block_validator sb_validator = {
.name = "superblock",
.prepare_for_write = sb_prepare_for_write,
.check = sb_check

6
drivers/md/dm-clone-metadata.c
View File

@ -163,7 +163,7 @@ struct dm_clone_metadata {
/*
* Superblock validation.
*/
static void sb_prepare_for_write(struct dm_block_validator *v,
static void sb_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b, size_t sb_block_size)
{
struct superblock_disk *sb;
@ -177,7 +177,7 @@ static void sb_prepare_for_write(struct dm_block_validator *v,
sb->csum = cpu_to_le32(csum);
}
static int sb_check(struct dm_block_validator *v, struct dm_block *b,
static int sb_check(const struct dm_block_validator *v, struct dm_block *b,
size_t sb_block_size)
{
struct superblock_disk *sb;
@ -220,7 +220,7 @@ static int sb_check(struct dm_block_validator *v, struct dm_block *b,
return 0;
}
static struct dm_block_validator sb_validator = {
static const struct dm_block_validator sb_validator = {
.name = "superblock",
.prepare_for_write = sb_prepare_for_write,
.check = sb_check

6
drivers/md/dm-era-target.c
View File

@ -196,7 +196,7 @@ struct superblock_disk {
* Superblock validation
*--------------------------------------------------------------
*/
static void sb_prepare_for_write(struct dm_block_validator *v,
static void sb_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
@ -221,7 +221,7 @@ static int check_metadata_version(struct superblock_disk *disk)
return 0;
}
static int sb_check(struct dm_block_validator *v,
static int sb_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t sb_block_size)
{
@ -254,7 +254,7 @@ static int sb_check(struct dm_block_validator *v,
return check_metadata_version(disk);
}
static struct dm_block_validator sb_validator = {
static const struct dm_block_validator sb_validator = {
.name = "superblock",
.prepare_for_write = sb_prepare_for_write,
.check = sb_check

6
drivers/md/dm-thin-metadata.c
View File

@ -249,7 +249,7 @@ struct dm_thin_device {
*/
#define SUPERBLOCK_CSUM_XOR 160774
static void sb_prepare_for_write(struct dm_block_validator *v,
static void sb_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -261,7 +261,7 @@ static void sb_prepare_for_write(struct dm_block_validator *v,
SUPERBLOCK_CSUM_XOR));
}
static int sb_check(struct dm_block_validator *v,
static int sb_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -294,7 +294,7 @@ static int sb_check(struct dm_block_validator *v,
return 0;
}
static struct dm_block_validator sb_validator = {
static const struct dm_block_validator sb_validator = {
.name = "superblock",
.prepare_for_write = sb_prepare_for_write,
.check = sb_check

6
drivers/md/persistent-data/dm-array.c
View File

@ -38,7 +38,7 @@ struct array_block {
*/
#define CSUM_XOR 595846735
static void array_block_prepare_for_write(struct dm_block_validator *v,
static void array_block_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t size_of_block)
{
@ -50,7 +50,7 @@ static void array_block_prepare_for_write(struct dm_block_validator *v,
CSUM_XOR));
}
static int array_block_check(struct dm_block_validator *v,
static int array_block_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t size_of_block)
{
@ -77,7 +77,7 @@ static int array_block_check(struct dm_block_validator *v,
return 0;
}
static struct dm_block_validator array_validator = {
static const struct dm_block_validator array_validator = {
.name = "array",
.prepare_for_write = array_block_prepare_for_write,
.check = array_block_check

12
drivers/md/persistent-data/dm-block-manager.c
View File

@ -345,7 +345,7 @@ void *dm_block_data(struct dm_block *b)
EXPORT_SYMBOL_GPL(dm_block_data);
struct buffer_aux {
struct dm_block_validator *validator;
const struct dm_block_validator *validator;
int write_locked;
#ifdef CONFIG_DM_DEBUG_BLOCK_MANAGER_LOCKING
@ -441,7 +441,7 @@ dm_block_t dm_bm_nr_blocks(struct dm_block_manager *bm)
static int dm_bm_validate_buffer(struct dm_block_manager *bm,
struct dm_buffer *buf,
struct buffer_aux *aux,
struct dm_block_validator *v)
const struct dm_block_validator *v)
{
if (unlikely(!aux->validator)) {
int r;
@ -467,7 +467,7 @@ static int dm_bm_validate_buffer(struct dm_block_manager *bm,
return 0;
}
int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
@ -500,7 +500,7 @@ int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
EXPORT_SYMBOL_GPL(dm_bm_read_lock);
int dm_bm_write_lock(struct dm_block_manager *bm,
dm_block_t b, struct dm_block_validator *v,
dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
@ -536,7 +536,7 @@ int dm_bm_write_lock(struct dm_block_manager *bm,
EXPORT_SYMBOL_GPL(dm_bm_write_lock);
int dm_bm_read_try_lock(struct dm_block_manager *bm,
dm_block_t b, struct dm_block_validator *v,
dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
struct buffer_aux *aux;
@ -569,7 +569,7 @@ int dm_bm_read_try_lock(struct dm_block_manager *bm,
}
int dm_bm_write_lock_zero(struct dm_block_manager *bm,
dm_block_t b, struct dm_block_validator *v,
dm_block_t b, const struct dm_block_validator *v,
struct dm_block **result)
{
int r;

14
drivers/md/persistent-data/dm-block-manager.h
View File

@ -51,12 +51,14 @@ dm_block_t dm_bm_nr_blocks(struct dm_block_manager *bm);
*/
struct dm_block_validator {
const char *name;
void (*prepare_for_write)(struct dm_block_validator *v, struct dm_block *b, size_t block_size);
void (*prepare_for_write)(const struct dm_block_validator *v,
struct dm_block *b, size_t block_size);
/*
* Return 0 if the checksum is valid or < 0 on error.
*/
int (*check)(struct dm_block_validator *v, struct dm_block *b, size_t block_size);
int (*check)(const struct dm_block_validator *v,
struct dm_block *b, size_t block_size);
};
/*----------------------------------------------------------------*/
@ -73,11 +75,11 @@ struct dm_block_validator {
* written back to the disk sometime after dm_bm_unlock is called.
*/
int dm_bm_read_lock(struct dm_block_manager *bm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
int dm_bm_write_lock(struct dm_block_manager *bm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
/*
@ -85,7 +87,7 @@ int dm_bm_write_lock(struct dm_block_manager *bm, dm_block_t b,
* available immediately.
*/
int dm_bm_read_try_lock(struct dm_block_manager *bm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
/*
@ -93,7 +95,7 @@ int dm_bm_read_try_lock(struct dm_block_manager *bm, dm_block_t b,
* overwrite the block completely. It saves a disk read.
*/
int dm_bm_write_lock_zero(struct dm_block_manager *bm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
void dm_bm_unlock(struct dm_block *b);

2
drivers/md/persistent-data/dm-btree-internal.h
View File

@ -138,7 +138,7 @@ static inline uint64_t value64(struct btree_node *n, uint32_t index)
*/
int lower_bound(struct btree_node *n, uint64_t key);
extern struct dm_block_validator btree_node_validator;
extern const struct dm_block_validator btree_node_validator;
/*
* Value type for upper levels of multi-level btrees.

6
drivers/md/persistent-data/dm-btree-spine.c
View File

@ -16,7 +16,7 @@
#define BTREE_CSUM_XOR 121107
static void node_prepare_for_write(struct dm_block_validator *v,
static void node_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -29,7 +29,7 @@ static void node_prepare_for_write(struct dm_block_validator *v,
BTREE_CSUM_XOR));
}
static int node_check(struct dm_block_validator *v,
static int node_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -81,7 +81,7 @@ static int node_check(struct dm_block_validator *v,
return 0;
}
struct dm_block_validator btree_node_validator = {
const struct dm_block_validator btree_node_validator = {
.name = "btree_node",
.prepare_for_write = node_prepare_for_write,
.check = node_check

12
drivers/md/persistent-data/dm-space-map-common.c
View File

@ -22,7 +22,7 @@
*/
#define INDEX_CSUM_XOR 160478
static void index_prepare_for_write(struct dm_block_validator *v,
static void index_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -34,7 +34,7 @@ static void index_prepare_for_write(struct dm_block_validator *v,
INDEX_CSUM_XOR));
}
static int index_check(struct dm_block_validator *v,
static int index_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -59,7 +59,7 @@ static int index_check(struct dm_block_validator *v,
return 0;
}
static struct dm_block_validator index_validator = {
static const struct dm_block_validator index_validator = {
.name = "index",
.prepare_for_write = index_prepare_for_write,
.check = index_check
@ -72,7 +72,7 @@ static struct dm_block_validator index_validator = {
*/
#define BITMAP_CSUM_XOR 240779
static void dm_bitmap_prepare_for_write(struct dm_block_validator *v,
static void dm_bitmap_prepare_for_write(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -84,7 +84,7 @@ static void dm_bitmap_prepare_for_write(struct dm_block_validator *v,
BITMAP_CSUM_XOR));
}
static int dm_bitmap_check(struct dm_block_validator *v,
static int dm_bitmap_check(const struct dm_block_validator *v,
struct dm_block *b,
size_t block_size)
{
@ -109,7 +109,7 @@ static int dm_bitmap_check(struct dm_block_validator *v,
return 0;
}
static struct dm_block_validator dm_sm_bitmap_validator = {
static const struct dm_block_validator dm_sm_bitmap_validator = {
.name = "sm_bitmap",
.prepare_for_write = dm_bitmap_prepare_for_write,
.check = dm_bitmap_check,

8
drivers/md/persistent-data/dm-transaction-manager.c
View File

@ -237,7 +237,7 @@ int dm_tm_commit(struct dm_transaction_manager *tm, struct dm_block *root)
EXPORT_SYMBOL_GPL(dm_tm_commit);
int dm_tm_new_block(struct dm_transaction_manager *tm,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result)
{
int r;
@ -266,7 +266,7 @@ int dm_tm_new_block(struct dm_transaction_manager *tm,
}
static int __shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result)
{
int r;
@ -306,7 +306,7 @@ static int __shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
}
int dm_tm_shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
struct dm_block_validator *v, struct dm_block **result,
const struct dm_block_validator *v, struct dm_block **result,
int *inc_children)
{
int r;
@ -331,7 +331,7 @@ int dm_tm_shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
EXPORT_SYMBOL_GPL(dm_tm_shadow_block);
int dm_tm_read_lock(struct dm_transaction_manager *tm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **blk)
{
if (tm->is_clone) {

6
drivers/md/persistent-data/dm-transaction-manager.h
View File

@ -64,7 +64,7 @@ int dm_tm_commit(struct dm_transaction_manager *tm, struct dm_block *superblock)
* Zeroes the new block and returns with write lock held.
*/
int dm_tm_new_block(struct dm_transaction_manager *tm,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
/*
@ -84,7 +84,7 @@ int dm_tm_new_block(struct dm_transaction_manager *tm,
* it locked when you call this.
*/
int dm_tm_shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result, int *inc_children);
/*
@ -92,7 +92,7 @@ int dm_tm_shadow_block(struct dm_transaction_manager *tm, dm_block_t orig,
* on it outstanding then it'll block.
*/
int dm_tm_read_lock(struct dm_transaction_manager *tm, dm_block_t b,
struct dm_block_validator *v,
const struct dm_block_validator *v,
struct dm_block **result);
void dm_tm_unlock(struct dm_transaction_manager *tm, struct dm_block *b);