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dm-verity: increase sprintf buffer size

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The prefix "DM_VERITY_ERR_BLOCK_NR" is 22 chars. Add '=', one digit for
type, ',', up to 20 digits for a u64 block number, and a NUL terminator:
that's 46 bytes. The buffer is 42 bytes. For block numbers >= 16 decimal
digits (devices larger than ~16 EB with 4K blocks), snprintf silently
truncates the uevent environment variable.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Assisted-by: Claude:claude-opus-4.6
Fixes: 65ff5b7ddf ("dm verity: add error handling modes for corrupted blocks")
Cc: stable@vger.kernel.org
This commit is contained in:
Mikulas Patocka 2026-07-09 21:36:01 +02:00
parent e72b793ae4
commit 88dd117c92
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-verity-target.c
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@ -26,7 +26,7 @@
#define DM_MSG_PREFIX "verity"
#define DM_VERITY_ENV_LENGTH 42
#define DM_VERITY_ENV_LENGTH 46
#define DM_VERITY_ENV_VAR_NAME "DM_VERITY_ERR_BLOCK_NR"
#define DM_VERITY_DEFAULT_PREFETCH_SIZE 262144