From 41086467d6647e66325f4c95eab84faa307f81ee Mon Sep 17 00:00:00 2001 From: Yuval Mintz Date: Sun, 5 Jun 2016 13:11:13 +0300 Subject: [PATCH] qed: Make PF more robust against malicious VF There are several requests the VF can make toward the PF which the driver would pass to firmware without checking the validity first - specifically, opening queues and updating vports. Such configurations might cause the firmware to assert. This adds validation of the legality of said configurations on the PF side before passing it onward via ramrod to firmware. Signed-off-by: Yuval Mintz Signed-off-by: David S. Miller --- drivers/net/ethernet/qlogic/qed/qed_sriov.c | 72 +++++++++++++++++++-- 1 file changed, 68 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.c b/drivers/net/ethernet/qlogic/qed/qed_sriov.c index 74fc82bb4ad7..dce81f5eefec 100644 --- a/drivers/net/ethernet/qlogic/qed/qed_sriov.c +++ b/drivers/net/ethernet/qlogic/qed/qed_sriov.c @@ -146,6 +146,45 @@ static struct qed_vf_info *qed_iov_get_vf_info(struct qed_hwfn *p_hwfn, return vf; } +static bool qed_iov_validate_rxq(struct qed_hwfn *p_hwfn, + struct qed_vf_info *p_vf, u16 rx_qid) +{ + if (rx_qid >= p_vf->num_rxqs) + DP_VERBOSE(p_hwfn, + QED_MSG_IOV, + "VF[0x%02x] - can't touch Rx queue[%04x]; Only 0x%04x are allocated\n", + p_vf->abs_vf_id, rx_qid, p_vf->num_rxqs); + return rx_qid < p_vf->num_rxqs; +} + +static bool qed_iov_validate_txq(struct qed_hwfn *p_hwfn, + struct qed_vf_info *p_vf, u16 tx_qid) +{ + if (tx_qid >= p_vf->num_txqs) + DP_VERBOSE(p_hwfn, + QED_MSG_IOV, + "VF[0x%02x] - can't touch Tx queue[%04x]; Only 0x%04x are allocated\n", + p_vf->abs_vf_id, tx_qid, p_vf->num_txqs); + return tx_qid < p_vf->num_txqs; +} + +static bool qed_iov_validate_sb(struct qed_hwfn *p_hwfn, + struct qed_vf_info *p_vf, u16 sb_idx) +{ + int i; + + for (i = 0; i < p_vf->num_sbs; i++) + if (p_vf->igu_sbs[i] == sb_idx) + return true; + + DP_VERBOSE(p_hwfn, + QED_MSG_IOV, + "VF[0%02x] - tried using sb_idx %04x which doesn't exist as one of its 0x%02x SBs\n", + p_vf->abs_vf_id, sb_idx, p_vf->num_sbs); + + return false; +} + int qed_iov_post_vf_bulletin(struct qed_hwfn *p_hwfn, int vfid, struct qed_ptt *p_ptt) { @@ -1687,12 +1726,17 @@ static void qed_iov_vf_mbx_start_rxq(struct qed_hwfn *p_hwfn, { struct qed_queue_start_common_params params; struct qed_iov_vf_mbx *mbx = &vf->vf_mbx; - u8 status = PFVF_STATUS_SUCCESS; + u8 status = PFVF_STATUS_NO_RESOURCE; struct vfpf_start_rxq_tlv *req; int rc; memset(¶ms, 0, sizeof(params)); req = &mbx->req_virt->start_rxq; + + if (!qed_iov_validate_rxq(p_hwfn, vf, req->rx_qid) || + !qed_iov_validate_sb(p_hwfn, vf, req->hw_sb)) + goto out; + params.queue_id = vf->vf_queues[req->rx_qid].fw_rx_qid; params.vf_qid = req->rx_qid; params.vport_id = vf->vport_id; @@ -1710,10 +1754,12 @@ static void qed_iov_vf_mbx_start_rxq(struct qed_hwfn *p_hwfn, if (rc) { status = PFVF_STATUS_FAILURE; } else { + status = PFVF_STATUS_SUCCESS; vf->vf_queues[req->rx_qid].rxq_active = true; vf->num_active_rxqs++; } +out: qed_iov_vf_mbx_start_rxq_resp(p_hwfn, p_ptt, vf, status); } @@ -1724,8 +1770,8 @@ static void qed_iov_vf_mbx_start_txq(struct qed_hwfn *p_hwfn, u16 length = sizeof(struct pfvf_def_resp_tlv); struct qed_queue_start_common_params params; struct qed_iov_vf_mbx *mbx = &vf->vf_mbx; + u8 status = PFVF_STATUS_NO_RESOURCE; union qed_qm_pq_params pq_params; - u8 status = PFVF_STATUS_SUCCESS; struct vfpf_start_txq_tlv *req; int rc; @@ -1736,6 +1782,11 @@ static void qed_iov_vf_mbx_start_txq(struct qed_hwfn *p_hwfn, memset(¶ms, 0, sizeof(params)); req = &mbx->req_virt->start_txq; + + if (!qed_iov_validate_txq(p_hwfn, vf, req->tx_qid) || + !qed_iov_validate_sb(p_hwfn, vf, req->hw_sb)) + goto out; + params.queue_id = vf->vf_queues[req->tx_qid].fw_tx_qid; params.vport_id = vf->vport_id; params.sb = req->hw_sb; @@ -1749,11 +1800,14 @@ static void qed_iov_vf_mbx_start_txq(struct qed_hwfn *p_hwfn, req->pbl_addr, req->pbl_size, &pq_params); - if (rc) + if (rc) { status = PFVF_STATUS_FAILURE; - else + } else { + status = PFVF_STATUS_SUCCESS; vf->vf_queues[req->tx_qid].txq_active = true; + } +out: qed_iov_prepare_resp(p_hwfn, p_ptt, vf, CHANNEL_TLV_START_TXQ, length, status); } @@ -2180,6 +2234,16 @@ static void qed_iov_vf_mbx_vport_update(struct qed_hwfn *p_hwfn, u16 length; int rc; + /* Valiate PF can send such a request */ + if (!vf->vport_instance) { + DP_VERBOSE(p_hwfn, + QED_MSG_IOV, + "No VPORT instance available for VF[%d], failing vport update\n", + vf->abs_vf_id); + status = PFVF_STATUS_FAILURE; + goto out; + } + memset(¶ms, 0, sizeof(params)); params.opaque_fid = vf->opaque_fid; params.vport_id = vf->vport_id; -- 2.20.1