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

Eric Biggers
2017-09-26T20:14:29Z

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(-)

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2.14.1.992.g2c7b836f3a-goog