[PATCH v3 0/3] keys: fix keyring assoc-array out-of-bounds read and index inconsistency

[Michael Bommarito <michael.bommarito@gmail.com>]

An unprivileged keyring whose keys collide through the description-chunk
path can drive assoc_array node splitting into an out-of-bounds slot write.
Patch 1 stops the out-of-bounds read in keyring_get_key_chunk(); patch 2
makes the chunk byte order agree with keyring_diff_objects(); patch 3 fixes
the shortcut-walk trim so the walk cannot be steered down the wrong
descendant.

v3 changes (patch 1 only; patches 2 and 3 are unchanged):
Per Jarkko's review, patch 1 no longer extends the existing
keyring_get_key_chunk() declaration line; the new offset is declared on its
own line as unsigned int.  No functional change.

Patches 2 and 3 are unchanged from v2 and carry Jarkko's Reviewed-by.

v2: https://lore.kernel.org/keyrings/20260714115451.3773164-1-michael.bommarito@gmail.com/
v1: https://lore.kernel.org/keyrings/20260712014500.480410-1-michael.bommarito@gmail.com/

Michael Bommarito (3):
  keys: fix out-of-bounds read in keyring_get_key_chunk()
  keys: make keyring key-chunk byte order agree with
    keyring_diff_objects()
  assoc_array: trim the final shortcut word using the current chunk end

 lib/assoc_array.c       |  3 ++-
 security/keys/keyring.c | 14 ++++++++------
 2 files changed, 10 insertions(+), 7 deletions(-)


base-commit: 2c7c88a412aa6d09cd04b414211b4ef8553b5309
-- 
2.53.0