Commit 78887832 authored by Laurent Vivier's avatar Laurent Vivier Committed by Herbert Xu

hwrng: core - don't wait on add_early_randomness()

add_early_randomness() is called by hwrng_register() when the
hardware is added. If this hardware and its module are present
at boot, and if there is no data available the boot hangs until
data are available and can't be interrupted.

For instance, in the case of virtio-rng, in some cases the host can be
not able to provide enough entropy for all the guests.

We can have two easy ways to reproduce the problem but they rely on
misconfiguration of the hypervisor or the egd daemon:

- if virtio-rng device is configured to connect to the egd daemon of the
host but when the virtio-rng driver asks for data the daemon is not
connected,

- if virtio-rng device is configured to connect to the egd daemon of the
host but the egd daemon doesn't provide data.

The guest kernel will hang at boot until the virtio-rng driver provides
enough data.

To avoid that, call rng_get_data() in non-blocking mode (wait=0)
from add_early_randomness().
Signed-off-by: default avatarLaurent Vivier <lvivier@redhat.com>
Fixes: d9e79726 ("hwrng: add randomness to system from rng...")
Cc: <stable@vger.kernel.org>
Reviewed-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 62a9d9fc
...@@ -68,7 +68,7 @@ static void add_early_randomness(struct hwrng *rng) ...@@ -68,7 +68,7 @@ static void add_early_randomness(struct hwrng *rng)
size_t size = min_t(size_t, 16, rng_buffer_size()); size_t size = min_t(size_t, 16, rng_buffer_size());
mutex_lock(&reading_mutex); mutex_lock(&reading_mutex);
bytes_read = rng_get_data(rng, rng_buffer, size, 1); bytes_read = rng_get_data(rng, rng_buffer, size, 0);
mutex_unlock(&reading_mutex); mutex_unlock(&reading_mutex);
if (bytes_read > 0) if (bytes_read > 0)
add_device_randomness(rng_buffer, bytes_read); add_device_randomness(rng_buffer, bytes_read);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment