[PATCH v2 0/3] certs: Prevent spurious errors on repeated blacklisting

[Thomas Weißschuh]

When the blacklist keyring was changed to allow updates from the root
user it gained an ->update() function that disallows all updates.
When the a hash is blacklisted multiple times from the builtin or
firmware-provided blacklist this spams prominent logs during boot:

[    0.890814] blacklist: Problem blacklisting hash (-13)

This affects the firmware of various vendors. Reported have been at least:
* Samsung: https://askubuntu.com/questions/1436856/
* Acer: https://ubuntuforums.org/showthread.php?t=2478840
* MSI: https://forum.archlabslinux.com/t/blacklist-problem-blacklisting-hash-13-errors-on-boot/6674/7
* Micro-Star: https://bbs.archlinux.org/viewtopic.php?id=278860

This series is an extension of the following single patch:
https://lore.kernel.org/all/20221104014704.3469-1-linux@xxxxxxxxxxxxxx/

Only the first patch has been marked for stable as otherwise the whole of
key_create() would need to be applied to stable.

Thomas Weißschuh (3):
  certs: log more information on blacklist error
  KEYS: Add key_create()
  certs: don't try to update blacklist keys

 certs/blacklist.c   |  23 ++++---
 include/linux/key.h |   8 +++
 security/keys/key.c | 149 +++++++++++++++++++++++++++++++++-----------
 3 files changed, 133 insertions(+), 47 deletions(-)


base-commit: f141df371335645ce29a87d9683a3f79fba7fd67
-- 
2.38.1