From: Li Qiang <liq3ea@gmail.com>
To: P J P <ppandit@redhat.com>
Cc: "Prasad J Pandit" <pjp@fedoraproject.org>,
"Stefan Hajnoczi" <stefanha@gmail.com>,
"Jason Wang" <jasowang@redhat.com>,
"Qemu Developers" <qemu-devel@nongnu.org>,
"Philippe Mathieu-Daudé" <philmd@redhat.com>,
"Li Qiang" <pangpei.lq@antfin.com>,
"Sven Schnelle" <svens@stackframe.org>,
"Ziming Zhang" <ezrakiez@gmail.com>
Subject: Re: [PATCH v7] net: tulip: check frame size and r/w data length
Date: Thu, 26 Mar 2020 19:11:17 +0800 [thread overview]
Message-ID: <CAKXe6SLY4bXoKmqqwghmXsWA9vF0jgiia7-E23+Sq9cA11pcHg@mail.gmail.com> (raw)
In-Reply-To: <20200324172722.32082-1-ppandit@redhat.com>
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P J P <ppandit@redhat.com> 于2020年3月25日周三 上午1:31写道:
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> Tulip network driver while copying tx/rx buffers does not check
> frame size against r/w data length. This may lead to OOB buffer
> access. Add check to avoid it.
>
> Limit iterations over descriptors to avoid potential infinite
> loop issue in tulip_xmit_list_update.
>
> Reported-by: Li Qiang <pangpei.lq@antfin.com>
> Reported-by: Ziming Zhang <ezrakiez@gmail.com>
> Reported-by: Jason Wang <jasowang@redhat.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
>
Tested-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Thanks,
Li Qiang
> ---
> hw/net/tulip.c | 36 +++++++++++++++++++++++++++---------
> 1 file changed, 27 insertions(+), 9 deletions(-)
>
> Update v7: fix length check expression to replace '>=' with '>'
> -> https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg07160.html
>
> diff --git a/hw/net/tulip.c b/hw/net/tulip.c
> index cfac2719d3..1295f51d07 100644
> --- a/hw/net/tulip.c
> +++ b/hw/net/tulip.c
> @@ -170,6 +170,10 @@ static void tulip_copy_rx_bytes(TULIPState *s, struct
> tulip_descriptor *desc)
> } else {
> len = s->rx_frame_len;
> }
> +
> + if (s->rx_frame_len + len > sizeof(s->rx_frame)) {
> + return;
> + }
> pci_dma_write(&s->dev, desc->buf_addr1, s->rx_frame +
> (s->rx_frame_size - s->rx_frame_len), len);
> s->rx_frame_len -= len;
> @@ -181,6 +185,10 @@ static void tulip_copy_rx_bytes(TULIPState *s, struct
> tulip_descriptor *desc)
> } else {
> len = s->rx_frame_len;
> }
> +
> + if (s->rx_frame_len + len > sizeof(s->rx_frame)) {
> + return;
> + }
> pci_dma_write(&s->dev, desc->buf_addr2, s->rx_frame +
> (s->rx_frame_size - s->rx_frame_len), len);
> s->rx_frame_len -= len;
> @@ -227,7 +235,8 @@ static ssize_t tulip_receive(TULIPState *s, const
> uint8_t *buf, size_t size)
>
> trace_tulip_receive(buf, size);
>
> - if (size < 14 || size > 2048 || s->rx_frame_len ||
> tulip_rx_stopped(s)) {
> + if (size < 14 || size > sizeof(s->rx_frame) - 4
> + || s->rx_frame_len || tulip_rx_stopped(s)) {
> return 0;
> }
>
> @@ -275,7 +284,6 @@ static ssize_t tulip_receive_nc(NetClientState *nc,
> return tulip_receive(qemu_get_nic_opaque(nc), buf, size);
> }
>
> -
> static NetClientInfo net_tulip_info = {
> .type = NET_CLIENT_DRIVER_NIC,
> .size = sizeof(NICState),
> @@ -558,7 +566,7 @@ static void tulip_tx(TULIPState *s, struct
> tulip_descriptor *desc)
> if ((s->csr[6] >> CSR6_OM_SHIFT) & CSR6_OM_MASK) {
> /* Internal or external Loopback */
> tulip_receive(s, s->tx_frame, s->tx_frame_len);
> - } else {
> + } else if (s->tx_frame_len <= sizeof(s->tx_frame)) {
> qemu_send_packet(qemu_get_queue(s->nic),
> s->tx_frame, s->tx_frame_len);
> }
> @@ -570,23 +578,31 @@ static void tulip_tx(TULIPState *s, struct
> tulip_descriptor *desc)
> }
> }
>
> -static void tulip_copy_tx_buffers(TULIPState *s, struct tulip_descriptor
> *desc)
> +static int tulip_copy_tx_buffers(TULIPState *s, struct tulip_descriptor
> *desc)
> {
> int len1 = (desc->control >> TDES1_BUF1_SIZE_SHIFT) &
> TDES1_BUF1_SIZE_MASK;
> int len2 = (desc->control >> TDES1_BUF2_SIZE_SHIFT) &
> TDES1_BUF2_SIZE_MASK;
>
> + if (s->tx_frame_len + len1 > sizeof(s->tx_frame)) {
> + return -1;
> + }
> if (len1) {
> pci_dma_read(&s->dev, desc->buf_addr1,
> s->tx_frame + s->tx_frame_len, len1);
> s->tx_frame_len += len1;
> }
>
> + if (s->tx_frame_len + len2 > sizeof(s->tx_frame)) {
> + return -1;
> + }
> if (len2) {
> pci_dma_read(&s->dev, desc->buf_addr2,
> s->tx_frame + s->tx_frame_len, len2);
> s->tx_frame_len += len2;
> }
> desc->status = (len1 + len2) ? 0 : 0x7fffffff;
> +
> + return 0;
> }
>
> static void tulip_setup_filter_addr(TULIPState *s, uint8_t *buf, int n)
> @@ -651,13 +667,15 @@ static uint32_t tulip_ts(TULIPState *s)
>
> static void tulip_xmit_list_update(TULIPState *s)
> {
> +#define TULIP_DESC_MAX 128
> + uint8_t i = 0;
> struct tulip_descriptor desc;
>
> if (tulip_ts(s) != CSR5_TS_SUSPENDED) {
> return;
> }
>
> - for (;;) {
> + for (i = 0; i < TULIP_DESC_MAX; i++) {
> tulip_desc_read(s, s->current_tx_desc, &desc);
> tulip_dump_tx_descriptor(s, &desc);
>
> @@ -675,10 +693,10 @@ static void tulip_xmit_list_update(TULIPState *s)
> s->tx_frame_len = 0;
> }
>
> - tulip_copy_tx_buffers(s, &desc);
> -
> - if (desc.control & TDES1_LS) {
> - tulip_tx(s, &desc);
> + if (!tulip_copy_tx_buffers(s, &desc)) {
> + if (desc.control & TDES1_LS) {
> + tulip_tx(s, &desc);
> + }
> }
> }
> tulip_desc_write(s, s->current_tx_desc, &desc);
> --
> 2.25.1
>
>
>
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next prev parent reply other threads:[~2020-03-26 11:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 17:27 [PATCH v7] net: tulip: check frame size and r/w data length P J P
2020-03-26 11:11 ` Li Qiang [this message]
2020-03-27 1:56 ` Jason Wang
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