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RDMA/nes: Don't allow userspace QPs to use STag zero 

STag zero is a special STag that allows consumers to access any bus
address without registering memory.  The nes driver unfortunately
allows STag zero to be used even with QPs created by unprivileged
userspace consumers, which means that any process with direct verbs
access to the nes device can read and write any memory accessible to
the underlying PCI device (usually any memory in the system).  Such
access is usually given for cluster software such as MPI to use, so
this is a local privilege escalation bug on most systems running this
driver.

The driver was using STag zero to receive the last streaming mode
data; to allow STag zero to be disabled for unprivileged QPs, the
driver now registers a special MR for this data.

Cc: <stable@kernel.org>
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Faisal Latif 2009-03-12 14:34:59 -07:00 committed by Linus Torvalds
parent 7ef0d7377c
commit c12e56ef69
3 changed files with 37 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/infiniband/hw/nes/nes_cm.c
View File

@ -2490,12 +2490,14 @@ static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
int ret = 0;
struct nes_vnic *nesvnic;
struct nes_device *nesdev;
struct nes_ib_device *nesibdev;
nesvnic = to_nesvnic(nesqp->ibqp.device);
if (!nesvnic)
return -EINVAL;
nesdev = nesvnic->nesdev;
nesibdev = nesvnic->nesibdev;
nes_debug(NES_DBG_CM, "netdev refcnt = %u.\n",
atomic_read(&nesvnic->netdev->refcnt));
@ -2507,6 +2509,8 @@ static int nes_disconnect(struct nes_qp *nesqp, int abrupt)
} else {
/* Need to free the Last Streaming Mode Message */
if (nesqp->ietf_frame) {
if (nesqp->lsmm_mr)
nesibdev->ibdev.dereg_mr(nesqp->lsmm_mr);
pci_free_consistent(nesdev->pcidev,
nesqp->private_data_len+sizeof(struct ietf_mpa_frame),
nesqp->ietf_frame, nesqp->ietf_frame_pbase);
@ -2543,6 +2547,12 @@ int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
u32 crc_value;
int ret;
int passive_state;
struct nes_ib_device *nesibdev;
struct ib_mr *ibmr = NULL;
struct ib_phys_buf ibphysbuf;
struct nes_pd *nespd;
ibqp = nes_get_qp(cm_id->device, conn_param->qpn);
if (!ibqp)
@ -2601,6 +2611,26 @@ int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
if (cm_id->remote_addr.sin_addr.s_addr !=
cm_id->local_addr.sin_addr.s_addr) {
u64temp = (unsigned long)nesqp;
nesibdev = nesvnic->nesibdev;
nespd = nesqp->nespd;
ibphysbuf.addr = nesqp->ietf_frame_pbase;
ibphysbuf.size = conn_param->private_data_len +
sizeof(struct ietf_mpa_frame);
ibmr = nesibdev->ibdev.reg_phys_mr((struct ib_pd *)nespd,
&ibphysbuf, 1,
IB_ACCESS_LOCAL_WRITE,
(u64 *)&nesqp->ietf_frame);
if (!ibmr) {
nes_debug(NES_DBG_CM, "Unable to register memory region"
"for lSMM for cm_node = %p \n",
cm_node);
return -ENOMEM;
}
ibmr->pd = &nespd->ibpd;
ibmr->device = nespd->ibpd.device;
nesqp->lsmm_mr = ibmr;
u64temp |= NES_SW_CONTEXT_ALIGN>>1;
set_wqe_64bit_value(wqe->wqe_words,
NES_IWARP_SQ_WQE_COMP_CTX_LOW_IDX,
@ -2611,14 +2641,13 @@ int nes_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
wqe->wqe_words[NES_IWARP_SQ_WQE_TOTAL_PAYLOAD_IDX] =
cpu_to_le32(conn_param->private_data_len +
sizeof(struct ietf_mpa_frame));
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_LOW_IDX] =
cpu_to_le32((u32)nesqp->ietf_frame_pbase);
wqe->wqe_words[NES_IWARP_SQ_WQE_FRAG0_HIGH_IDX] =
cpu_to_le32((u32)((u64)nesqp->ietf_frame_pbase >> 32));
set_wqe_64bit_value(wqe->wqe_words,
NES_IWARP_SQ_WQE_FRAG0_LOW_IDX,
(u64)nesqp->ietf_frame);
wqe->wqe_words[NES_IWARP_SQ_WQE_LENGTH0_IDX] =
cpu_to_le32(conn_param->private_data_len +
sizeof(struct ietf_mpa_frame));
wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = 0;
wqe->wqe_words[NES_IWARP_SQ_WQE_STAG0_IDX] = ibmr->lkey;
nesqp->nesqp_context->ird_ord_sizes |=
cpu_to_le32(NES_QPCONTEXT_ORDIRD_LSMM_PRESENT |

2
drivers/infiniband/hw/nes/nes_verbs.c
View File

@ -1360,8 +1360,10 @@ static struct ib_qp *nes_create_qp(struct ib_pd *ibpd,
NES_QPCONTEXT_MISC_RQ_SIZE_SHIFT);
nesqp->nesqp_context->misc |= cpu_to_le32((u32)nesqp->hwqp.sq_encoded_size <<
NES_QPCONTEXT_MISC_SQ_SIZE_SHIFT);
if (!udata) {
nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_PRIV_EN);
nesqp->nesqp_context->misc |= cpu_to_le32(NES_QPCONTEXT_MISC_FAST_REGISTER_EN);
}
nesqp->nesqp_context->cqs = cpu_to_le32(nesqp->nesscq->hw_cq.cq_number +
((u32)nesqp->nesrcq->hw_cq.cq_number << 16));
u64temp = (u64)nesqp->hwqp.sq_pbase;

1
drivers/infiniband/hw/nes/nes_verbs.h
View File

@ -134,6 +134,7 @@ struct nes_qp {
struct ietf_mpa_frame *ietf_frame;
dma_addr_t ietf_frame_pbase;
wait_queue_head_t state_waitq;
struct ib_mr *lsmm_mr;
unsigned long socket;
struct nes_hw_qp hwqp;
struct work_struct work;