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173 lines
8.5 KiB
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173 lines
8.5 KiB
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From: P J P <ppandit@redhat.com>
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To: Dmitry Fleytman <dmitry.fleytman@gmail.com>
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Subject: [PATCH] net: vmxnet3: validate configuration values during activate
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(CVE-2021-20203)
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Date: Sat, 30 Jan 2021 18:46:52 +0530
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Cc: Gaoning Pan <pgn@zju.edu.cn>, QEMU Developers <qemu-devel@nongnu.org>,
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Prasad J Pandit <pjp@fedoraproject.org>
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<qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org>
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List-Archive: <https://lore.kernel.org/qemu-devel/>
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From: Prasad J Pandit <pjp@fedoraproject.org>
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While activating device in vmxnet3_acticate_device(), it does not
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validate guest supplied configuration values against predefined
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minimum - maximum limits. This may lead to integer overflow or
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OOB access issues. Add checks to avoid it.
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Fixes: CVE-2021-20203
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Buglink: https://bugs.launchpad.net/qemu/+bug/1913873
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Reported-by: Gaoning Pan <pgn@zju.edu.cn>
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Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
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---
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hw/net/vmxnet3.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
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index eff299f629..4a910ca971 100644
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--- a/hw/net/vmxnet3.c
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+++ b/hw/net/vmxnet3.c
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@@ -1420,6 +1420,7 @@ static void vmxnet3_activate_device(VMXNET3State *s)
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vmxnet3_setup_rx_filtering(s);
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/* Cache fields from shared memory */
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s->mtu = VMXNET3_READ_DRV_SHARED32(d, s->drv_shmem, devRead.misc.mtu);
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+ assert(VMXNET3_MIN_MTU <= s->mtu && s->mtu < VMXNET3_MAX_MTU);
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VMW_CFPRN("MTU is %u", s->mtu);
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s->max_rx_frags =
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@@ -1473,6 +1474,9 @@ static void vmxnet3_activate_device(VMXNET3State *s)
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/* Read rings memory locations for TX queues */
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pa = VMXNET3_READ_TX_QUEUE_DESCR64(d, qdescr_pa, conf.txRingBasePA);
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size = VMXNET3_READ_TX_QUEUE_DESCR32(d, qdescr_pa, conf.txRingSize);
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+ if (size > VMXNET3_TX_RING_MAX_SIZE) {
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+ size = VMXNET3_TX_RING_MAX_SIZE;
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+ }
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vmxnet3_ring_init(d, &s->txq_descr[i].tx_ring, pa, size,
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sizeof(struct Vmxnet3_TxDesc), false);
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@@ -1483,6 +1487,9 @@ static void vmxnet3_activate_device(VMXNET3State *s)
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/* TXC ring */
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pa = VMXNET3_READ_TX_QUEUE_DESCR64(d, qdescr_pa, conf.compRingBasePA);
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size = VMXNET3_READ_TX_QUEUE_DESCR32(d, qdescr_pa, conf.compRingSize);
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+ if (size > VMXNET3_TC_RING_MAX_SIZE) {
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+ size = VMXNET3_TC_RING_MAX_SIZE;
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+ }
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vmxnet3_ring_init(d, &s->txq_descr[i].comp_ring, pa, size,
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sizeof(struct Vmxnet3_TxCompDesc), true);
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VMXNET3_RING_DUMP(VMW_CFPRN, "TXC", i, &s->txq_descr[i].comp_ring);
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@@ -1524,6 +1531,9 @@ static void vmxnet3_activate_device(VMXNET3State *s)
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/* RX rings */
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pa = VMXNET3_READ_RX_QUEUE_DESCR64(d, qd_pa, conf.rxRingBasePA[j]);
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size = VMXNET3_READ_RX_QUEUE_DESCR32(d, qd_pa, conf.rxRingSize[j]);
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+ if (size > VMXNET3_RX_RING_MAX_SIZE) {
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+ size = VMXNET3_RX_RING_MAX_SIZE;
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+ }
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vmxnet3_ring_init(d, &s->rxq_descr[i].rx_ring[j], pa, size,
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sizeof(struct Vmxnet3_RxDesc), false);
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VMW_CFPRN("RX queue %d:%d: Base: %" PRIx64 ", Size: %d",
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@@ -1533,6 +1543,9 @@ static void vmxnet3_activate_device(VMXNET3State *s)
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/* RXC ring */
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pa = VMXNET3_READ_RX_QUEUE_DESCR64(d, qd_pa, conf.compRingBasePA);
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size = VMXNET3_READ_RX_QUEUE_DESCR32(d, qd_pa, conf.compRingSize);
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+ if (size > VMXNET3_RC_RING_MAX_SIZE) {
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+ size = VMXNET3_RC_RING_MAX_SIZE;
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+ }
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vmxnet3_ring_init(d, &s->rxq_descr[i].comp_ring, pa, size,
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sizeof(struct Vmxnet3_RxCompDesc), true);
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VMW_CFPRN("RXC queue %d: Base: %" PRIx64 ", Size: %d", i, pa, size);
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--
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2.29.2
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