• Jason A. Donenfeld's avatar
    random: warn when kernel uses unseeded randomness · d06bfd19
    Jason A. Donenfeld authored
    This enables an important dmesg notification about when drivers have
    used the crng without it being seeded first. Prior, these errors would
    occur silently, and so there hasn't been a great way of diagnosing these
    types of bugs for obscure setups. By adding this as a config option, we
    can leave it on by default, so that we learn where these issues happen,
    in the field, will still allowing some people to turn it off, if they
    really know what they're doing and do not want the log entries.
    
    However, we don't leave it _completely_ by default. An earlier version
    of this patch simply had `default y`. I'd really love that, but it turns
    out, this problem with unseeded randomness being used is really quite
    present and is going to take a long time to fix. Thus, as a compromise
    between log-messages-for-all and nobody-knows, this is `default y`,
    except it is also `depends on DEBUG_KERNEL`. This will ensure that the
    curious see the messages while others don't have to.
    Signed-off-by: default avatarJason A. Donenfeld <Jason@zx2c4.com>
    Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
    d06bfd19
Kconfig.debug 69.2 KB