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Date:   Thu, 22 Jul 2021 11:17:58 +0200
From:   Ahmad Fatoum <>
To:     David Howells <>,
        Jarkko Sakkinen <>,
        James Morris <>,
        "Serge E. Hallyn" <>,
        Alasdair Kergon <>,
        Mike Snitzer <>,,
        Song Liu <>, Richard Weinberger <>
Subject: [RFC PATCH v1 0/4] keys: introduce key_extract_material helper

While keys of differing type have a common struct key definition, there is
no common scheme to the payload and key material extraction differs.

For kernel functionality that supports different key types,
this means duplicated code for key material extraction and because key type
is discriminated by a pointer to a global, users need to replicate
reachability checks as well, so builtin code doesn't depend on a key
type symbol offered by a module.

Make this easier by adding a common helper with initial support for
user, logon, encrypted and trusted keys.

This series contains two example of its use: dm-crypt uses it to reduce
boilerplate and ubifs authentication uses it to gain support for trusted
and encrypted keys alongside the already supported logon keys.

Looking forward to your feedback,

To: David Howells <>
To: Jarkko Sakkinen <>
To: James Morris <>
To: "Serge E. Hallyn" <>
To: Alasdair Kergon <>
To: Mike Snitzer <>
To: Song Liu <>
To: Richard Weinberger <>

Ahmad Fatoum (4):
  keys: introduce key_extract_material helper
  dm: crypt: use new key_extract_material helper
  ubifs: auth: remove never hit key type error check
  ubifs: auth: consult encrypted and trusted keys if no logon key was found

 Documentation/filesystems/ubifs.rst |  2 +-
 drivers/md/dm-crypt.c               | 65 ++++--------------------------
 fs/ubifs/auth.c                     | 25 +++++-------
 include/linux/key.h                 | 45 +++++++++++++++++++++-
 security/keys/key.c                 | 40 ++++++++++++++++++-
 5 files changed, 107 insertions(+), 70 deletions(-)

base-commit: 2734d6c1b1a089fb593ef6a23d4b70903526fe0c
git-series 0.9.1

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