[PATCH v2 0/4] ecdsa KEYCTL_PKEY_QUERY fixes

[Lukas Wunner <lukas@wunner.de>]

For ecdsa, KEYCTL_PKEY_QUERY reports nonsensical values for
enc/dec size and (for P521 keys) also the key size.
Second attempt at fixing them.

Changes v1 -> v2:

* New patch [2/4] to introduce DIV_ROUND_UP_POW2(), which avoids
  integer overflows that may occur with DIV_ROUND_UP() (Herbert)

* Amend patch [4/4] to use DIV_ROUND_UP_POW2() (Herbert)

* Amend patch [4/4] to use BITS_PER_BYTE for clarity

Link to v1:

  https://lore.kernel.org/r/cover.1735236227.git.lukas@wunner.de

Lukas Wunner (4):
  crypto: sig - Prepare for algorithms with variable signature size
  crypto: ecdsa - Harden against integer overflows in DIV_ROUND_UP()
  crypto: ecdsa - Fix enc/dec size reported by KEYCTL_PKEY_QUERY
  crypto: ecdsa - Fix NIST P521 key size reported by KEYCTL_PKEY_QUERY

 crypto/asymmetric_keys/public_key.c | 22 +++++++++++-----------
 crypto/ecc.c                        |  2 +-
 crypto/ecdsa-p1363.c                |  8 +++++---
 crypto/ecdsa-x962.c                 |  7 ++++---
 crypto/ecdsa.c                      |  2 +-
 crypto/ecrdsa.c                     |  2 +-
 crypto/rsassa-pkcs1.c               |  4 ++--
 crypto/sig.c                        |  9 +++++++--
 crypto/testmgr.c                    |  7 ++++---
 include/crypto/sig.h                |  7 ++++---
 include/linux/math.h                | 12 ++++++++++++
 11 files changed, 52 insertions(+), 30 deletions(-)

-- 
2.43.0