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test: dm: virtio_rng: Test virtio-rng with faked device

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Add a regression test for virtio-rng reading beyond the end of its
buffer if the virtio device provides an invalid length.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andrew Scull 2022-05-16 10:41:40 +00:00 committed by Tom Rini
parent 43937a4f5e
commit d036104a02
2 changed files with 53 additions and 0 deletions
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1
test/dm/Makefile
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@ -110,6 +110,7 @@ obj-$(CONFIG_DM_VIDEO) += video.o
ifeq ($(CONFIG_VIRTIO_SANDBOX),y)
obj-y += virtio.o
obj-$(CONFIG_VIRTIO_RNG) += virtio_device.o
obj-$(CONFIG_VIRTIO_RNG) += virtio_rng.o
endif
ifeq ($(CONFIG_WDT_GPIO)$(CONFIG_WDT_SANDBOX),yy)
obj-y += wdt.o

52
test/dm/virtio_rng.c Normal file
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@ -0,0 +1,52 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2022 Google, Inc.
* Written by Andrew Scull <ascull@google.com>
*/
#include <common.h>
#include <dm.h>
#include <virtio_types.h>
#include <virtio.h>
#include <virtio_ring.h>
#include <dm/device-internal.h>
#include <dm/test.h>
#include <rng.h>
#include <test/test.h>
#include <test/ut.h>
/* This is a brittle means of getting access to the virtqueue */
struct virtio_rng_priv {
struct virtqueue *rng_vq;
};
/* Test the virtio-rng driver validates the used size */
static int dm_test_virtio_rng_check_len(struct unit_test_state *uts)
{
struct udevice *bus, *dev;
struct virtio_rng_priv *priv;
u8 buffer[16];
/* check probe success */
ut_assertok(uclass_first_device(UCLASS_VIRTIO, &bus));
ut_assertnonnull(bus);
/* check the child virtio-rng device is bound */
ut_assertok(device_find_first_child(bus, &dev));
ut_assertnonnull(dev);
/* probe the virtio-rng driver */
ut_assertok(device_probe(dev));
/* simulate the device returning the buffer with too much data */
priv = dev_get_priv(dev);
priv->rng_vq->vring.used->idx = 1;
priv->rng_vq->vring.used->ring[0].id = 0;
priv->rng_vq->vring.used->ring[0].len = U32_MAX;
/* check the driver gracefully handles the error */
ut_asserteq(-EIO, dm_rng_read(dev, buffer, sizeof(buffer)));
return 0;
}
DM_TEST(dm_test_virtio_rng_check_len, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);