linux-kernel - [PATCH v2 0/6] KEYS: fix atomicity issues with key flags

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Message-Id: <20170926201105.126166-1-ebiggers3@gmail.com>
Date:   Tue, 26 Sep 2017 13:10:59 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     keyrings@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Michael Halcrow <mhalcrow@...gle.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH v2 0/6] KEYS: fix atomicity issues with key flags

From: Eric Biggers <ebiggers@...gle.com>

The first patch in this series fixes the race between updating and
finding a negative key, which could be used by an unprivileged user to
cause a kernel oops.  That patch is Cc'ed to stable.

The remaining patches fix some other, more theoretical atomicity issues
with accessing key->flags and key->expiry, then eliminate
KEY_FLAG_NEGATIVE, which becomes unnecessary after the first patch.

Eric Biggers (6):
  KEYS: fix race between updating and finding negative key
  KEYS: load key flags atomically in key_is_instantiated()
  KEYS: load key flags and expiry time atomically in key_validate()
  KEYS: load key flags and expiry time atomically in
    keyring_search_iterator()
  KEYS: load key flags and expiry time atomically in proc_keys_show()
  KEYS: remove KEY_FLAG_NEGATIVE

 include/linux/key.h                      | 37 +++++++++++++++++++++++---------
 security/keys/encrypted-keys/encrypted.c |  2 +-
 security/keys/gc.c                       |  4 +---
 security/keys/key.c                      | 24 +++++++++++++++------
 security/keys/keyctl.c                   |  5 ++++-
 security/keys/keyring.c                  | 12 ++++++-----
 security/keys/permission.c               |  7 +++---
 security/keys/proc.c                     | 28 +++++++++++++-----------
 security/keys/request_key.c              | 11 ++++++----
 security/keys/trusted.c                  |  2 +-
 security/keys/user_defined.c             |  2 +-
 11 files changed, 86 insertions(+), 48 deletions(-)

-- 
2.14.1.992.g2c7b836f3a-goog