From: Andrew Scull <ascull@google.com>
To: u-boot@lists.denx.de
Cc: sjg@chromium.org, trini@konsulko.com,
Andrew Scull <ascull@google.com>,
Sughosh Ganu <sughosh.ganu@linaro.org>
Subject: [PATCH v2 11/12] virtio: rng: Check length before copying
Date: Wed, 13 Apr 2022 14:21:36 +0000 [thread overview]
Message-ID: <20220413142137.560987-12-ascull@google.com> (raw)
In-Reply-To: <20220413142137.560987-1-ascull@google.com>
Check the length of data written by the device is consistent with the
size of the buffers to avoid out-of-bounds memory accesses in case
values aren't consistent.
Signed-off-by: Andrew Scull <ascull@google.com>
Cc: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
drivers/virtio/virtio_rng.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/virtio/virtio_rng.c b/drivers/virtio/virtio_rng.c
index 9314c0a03e..b85545c2ee 100644
--- a/drivers/virtio/virtio_rng.c
+++ b/drivers/virtio/virtio_rng.c
@@ -41,6 +41,9 @@ static int virtio_rng_read(struct udevice *dev, void *data, size_t len)
while (!virtqueue_get_buf(priv->rng_vq, &rsize))
;
+ if (rsize > sg.length)
+ return -EIO;
+
memcpy(ptr, buf, rsize);
len -= rsize;
ptr += rsize;
--
2.35.1.1178.g4f1659d476-goog
next prev parent reply other threads:[~2022-04-13 14:23 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-13 14:21 [PATCH v2 00/12] virtio: Harden and test vring Andrew Scull
2022-04-13 14:21 ` [PATCH v2 01/12] virtio_ring: Merge identical variables Andrew Scull
2022-04-22 8:55 ` Bin Meng
2022-04-13 14:21 ` [PATCH v2 02/12] virtio_ring: Add helper to attach vring descriptor Andrew Scull
2022-04-22 9:07 ` Bin Meng
2022-04-13 14:21 ` [PATCH v2 03/12] virtio_ring: Maintain a shadow copy of descriptors Andrew Scull
2022-04-13 14:21 ` [PATCH v2 04/12] virtio_ring: Check used descriptors are chain heads Andrew Scull
2022-04-13 14:21 ` [PATCH v2 05/12] dm: test: virtio: Test the virtio ring Andrew Scull
2022-04-13 14:21 ` [PATCH v2 06/12] virtio: sandbox: Fix device features bitfield Andrew Scull
2022-04-13 14:21 ` [PATCH v2 07/12] test: dm: virtio: Test notify before del_vqs Andrew Scull
2022-04-13 14:21 ` [PATCH v2 08/12] test: dm: virtio: Split out virtio device tests Andrew Scull
2022-04-13 14:21 ` [PATCH v2 09/12] virtio: sandbox: Bind RNG rather than block device Andrew Scull
2022-04-13 14:21 ` [PATCH v2 10/12] test: dm: virtio: Test virtio device driver probing Andrew Scull
2022-04-13 14:21 ` Andrew Scull [this message]
2022-04-13 14:21 ` [PATCH v2 12/12] test: dm: virtio_rng: Test virtio-rng with faked device Andrew Scull
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