Description
In the Linux kernel, the following vulnerability has been resolved: dm-integrity: replace forgeable discard filler with a keyed sector marker The discard-block check in dm_integrity_rw_tag() treats a stored tag of all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and skips HMAC verification. allow_discards is only accepted in dm-integrity's standalone mode. An attacker with raw write access to the backing device, but without the integrity key, can stamp any block with an all-0xf6 tag and have it served as authentic. Add a new "allow_discards_keyed" target argument that marks discarded blocks with a keyed checksum of (salt || sector) instead, computed by integrity_discard_checksum().
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
84597a44a9d86ac949900441cea7da0af0f2f473 to < 388c3f6496bb8083576d989e6d249ba9807c6b0baffected84597a44a9d86ac949900441cea7da0af0f2f473 to < 5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775affected84597a44a9d86ac949900441cea7da0af0f2f473 to < 6228722c27304e4682cddc1fede03898f87e4414affected84597a44a9d86ac949900441cea7da0af0f2f473 to < 68c5c42567bc462139128968ebbfadd0aefff519affected
Linux Linux
Default version status: affected
5.7affected0 to < 5.7unaffected6.12.114 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected