Eric Biggers fe303ba7ab KEYS: allow reaching the keys quotas exactly ...

commit a08bf91ce2 upstream.

If the sysctl 'kernel.keys.maxkeys' is set to some number n, then
actually users can only add up to 'n - 1' keys.  Likewise for
'kernel.keys.maxbytes' and the root_* versions of these sysctls.  But
these sysctls are apparently supposed to be *maximums*, as per their
names and all documentation I could find -- the keyrings(7) man page,
Documentation/security/keys/core.rst, and all the mentions of EDQUOT
meaning that the key quota was *exceeded* (as opposed to reached).

Thus, fix the code to allow reaching the quotas exactly.

Fixes: 0b77f5bfb4 ("keys: make the keyring quotas controllable through /proc/sys")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2019-02-27 10:08:02 +01:00

..

encrypted-keys

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

big_key.c

KEYS: Fix race between updating and finding a negative key

2017-10-18 09:12:40 +01:00

compat_dh.c

KEYS: DH: validate __spare field

2017-07-14 11:01:38 +10:00

compat.c

KEYS: add SP800-56A KDF support for DH

2017-04-04 22:33:38 +01:00

dh.c

Revert "uapi/linux/keyctl.h: don't use C++ reserved keyword as a struct member name"

2018-09-29 03:06:04 -07:00

gc.c

KEYS: Fix race between updating and finding a negative key

2017-10-18 09:12:40 +01:00

internal.h

KEYS: prevent creating a different user's keyrings

2017-09-25 15:19:57 +01:00

Kconfig

security/keys: BIG_KEY requires CONFIG_CRYPTO

2017-10-18 09:12:40 +01:00

key.c

KEYS: allow reaching the keys quotas exactly

2019-02-27 10:08:02 +01:00

keyctl.c

KEYS: reject NULL restriction string when type is specified

2017-12-14 09:52:53 +01:00

keyring.c

KEYS: return full count in keyring_read() if buffer is too small

2017-11-02 20:58:05 +11:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

permission.c

KEYS: load key flags and expiry time atomically in key_validate()

2017-10-18 09:12:41 +01:00

persistent.c

sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>

2017-03-02 08:42:31 +01:00

proc.c

KEYS: load key flags and expiry time atomically in proc_keys_show()

2017-10-18 09:12:41 +01:00

process_keys.c

KEYS: Fix race between updating and finding a negative key

2017-10-18 09:12:40 +01:00

request_key_auth.c

KEYS: Fix race between updating and finding a negative key

2017-10-18 09:12:40 +01:00

request_key.c

KEYS: add missing permission check for request_key() destination

2017-12-14 09:52:52 +01:00

sysctl.c

security: Convert use of typedef ctl_table to struct ctl_table

2014-04-15 13:39:58 +10:00

trusted.c

KEYS: trusted: fix writing past end of buffer in trusted_read()

2017-11-02 20:58:07 +11:00

trusted.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

user_defined.c

KEYS: Fix race between updating and finding a negative key

2017-10-18 09:12:40 +01:00