• Eric Biggers's avatar
    KEYS: allow reaching the keys quotas exactly · a08bf91c
    Eric Biggers authored
    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: 0b77f5bf ("keys: make the keyring quotas controllable through /proc/sys")
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
    Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
    Signed-off-by: default avatarJames Morris <james.morris@microsoft.com>
    a08bf91c
key.c 30.5 KB