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- Fix DM integrity and verity targets to not use excessive stack when

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they recheck in the error path.
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Merge tag 'for-6.8/dm-fix-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fix from Mike Snitzer:

 - Fix DM integrity and verity targets to not use excessive stack when
   they recheck in the error path.

* tag 'for-6.8/dm-fix-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm-integrity, dm-verity: reduce stack usage for recheck
This commit is contained in:
Linus Torvalds 2024-02-24 09:55:29 -08:00
commit f2e367d6ad
2 changed files with 6 additions and 8 deletions
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10
drivers/md/dm-integrity.c
View File

@ -1691,14 +1691,13 @@ failed:
get_random_bytes(result, ic->tag_size);
}
static void integrity_recheck(struct dm_integrity_io *dio)
static noinline void integrity_recheck(struct dm_integrity_io *dio, char *checksum)
{
struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io));
struct dm_integrity_c *ic = dio->ic;
struct bvec_iter iter;
struct bio_vec bv;
sector_t sector, logical_sector, area, offset;
char checksum_onstack[max_t(size_t, HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)];
struct page *page;
void *buffer;
@ -1734,9 +1733,8 @@ static void integrity_recheck(struct dm_integrity_io *dio)
goto free_ret;
}
integrity_sector_checksum(ic, logical_sector, buffer,
checksum_onstack);
r = dm_integrity_rw_tag(ic, checksum_onstack, &dio->metadata_block,
integrity_sector_checksum(ic, logical_sector, buffer, checksum);
r = dm_integrity_rw_tag(ic, checksum, &dio->metadata_block,
&dio->metadata_offset, ic->tag_size, TAG_CMP);
if (r) {
if (r > 0) {
@ -1851,7 +1849,7 @@ again:
checksums_ptr - checksums, dio->op == REQ_OP_READ ? TAG_CMP : TAG_WRITE);
if (unlikely(r)) {
if (r > 0) {
integrity_recheck(dio);
integrity_recheck(dio, checksums);
goto skip_io;
}
if (likely(checksums != checksums_onstack))

4
drivers/md/dm-verity-target.c
View File

@ -491,8 +491,8 @@ static int verity_recheck_copy(struct dm_verity *v, struct dm_verity_io *io,
return 0;
}
static int verity_recheck(struct dm_verity *v, struct dm_verity_io *io,
struct bvec_iter start, sector_t cur_block)
static noinline int verity_recheck(struct dm_verity *v, struct dm_verity_io *io,
struct bvec_iter start, sector_t cur_block)
{
struct page *page;
void *buffer;