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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:
======
   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
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6
drivers/md/persistent-data/dm-array.c
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@@ -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