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    Subject[PATCH 4.19 021/234] random: ignore GRND_RANDOM in getentropy(2)
    Date
    From: Andy Lutomirski <luto@kernel.org>

    commit 48446f198f9adcb499b30332488dfd5bc3f176f6 upstream.

    The separate blocking pool is going away. Start by ignoring
    GRND_RANDOM in getentropy(2).

    This should not materially break any API. Any code that worked
    without this change should work at least as well with this change.

    Signed-off-by: Andy Lutomirski <luto@kernel.org>
    Link: https://lore.kernel.org/r/705c5a091b63cc5da70c99304bb97e0109be0a26.1577088521.git.luto@kernel.org
    Signed-off-by: Theodore Ts'o <tytso@mit.edu>
    Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/char/random.c | 3 ---
    include/uapi/linux/random.h | 2 +-
    2 files changed, 1 insertion(+), 4 deletions(-)

    --- a/drivers/char/random.c
    +++ b/drivers/char/random.c
    @@ -2210,9 +2210,6 @@ SYSCALL_DEFINE3(getrandom, char __user *
    if (count > INT_MAX)
    count = INT_MAX;

    - if (flags & GRND_RANDOM)
    - return _random_read(flags & GRND_NONBLOCK, buf, count);
    -
    if (!(flags & GRND_INSECURE) && !crng_ready()) {
    if (flags & GRND_NONBLOCK)
    return -EAGAIN;
    --- a/include/uapi/linux/random.h
    +++ b/include/uapi/linux/random.h
    @@ -48,7 +48,7 @@ struct rand_pool_info {
    * Flags for getrandom(2)
    *
    * GRND_NONBLOCK Don't block and return EAGAIN instead
    - * GRND_RANDOM Use the /dev/random pool instead of /dev/urandom
    + * GRND_RANDOM No effect
    * GRND_INSECURE Return non-cryptographic random bytes
    */
    #define GRND_NONBLOCK 0x0001

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