RDMA/irdma: Prevent zero-length STAG registration

Currently irdma allows zero-length STAGs to be programmed in HW during
the kernel mode fast register flow. Zero-length MR or STAG registration
disable HW memory length checks.

Improve gaps in bounds checking in irdma by preventing zero-length STAG or
MR registrations except if the IB_PD_UNSAFE_GLOBAL_RKEY is set.

This addresses the disclosure CVE-2023-25775.

Fixes: b48c24c2d710 ("RDMA/irdma: Implement device supported verb APIs")
Signed-off-by: Christopher Bednarz <christopher.n.bednarz@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20230818144838.1758-1-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/hw/irdma/ctrl.c b/drivers/infiniband/hw/irdma/ctrl.c
index b1fdddd2fa1a94523f427794eed98e170a5a17db..55421a92882c7b0471ae9f7f6a35808349d856a6 100644 (file)
--- a/drivers/infiniband/hw/irdma/ctrl.c
+++ b/drivers/infiniband/hw/irdma/ctrl.c
@@ -1061,6 +1061,9 @@ static int irdma_sc_alloc_stag(struct irdma_sc_dev *dev,
        u64 hdr;
        enum irdma_page_size page_size;
 
+       if (!info->total_len && !info->all_memory)
+               return -EINVAL;
+
        if (info->page_size == 0x40000000)
                page_size = IRDMA_PAGE_SIZE_1G;
        else if (info->page_size == 0x200000)
@@ -1126,6 +1129,9 @@ static int irdma_sc_mr_reg_non_shared(struct irdma_sc_dev *dev,
        u8 addr_type;
        enum irdma_page_size page_size;
 
+       if (!info->total_len && !info->all_memory)
+               return -EINVAL;
+
        if (info->page_size == 0x40000000)
                page_size = IRDMA_PAGE_SIZE_1G;
        else if (info->page_size == 0x200000)

diff --git a/drivers/infiniband/hw/irdma/type.h b/drivers/infiniband/hw/irdma/type.h
index b49a98c208bf6e73c5064072b1200c3a2f9284c9..bee9609f4be72b071d647410f54bfd41a92a8a84 100644 (file)
--- a/drivers/infiniband/hw/irdma/type.h
+++ b/drivers/infiniband/hw/irdma/type.h
@@ -969,6 +969,7 @@ struct irdma_allocate_stag_info {
        bool remote_access:1;
        bool use_hmc_fcn_index:1;
        bool use_pf_rid:1;
+       bool all_memory:1;
        u8 hmc_fcn_index;
 };
 
@@ -996,6 +997,7 @@ struct irdma_reg_ns_stag_info {
        bool use_hmc_fcn_index:1;
        u8 hmc_fcn_index;
        bool use_pf_rid:1;
+       bool all_memory:1;
 };
 
 struct irdma_fast_reg_stag_info {

diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
index 6cffe21558fe360c42f71f1990be3b214b8afd6e..3eb7a7a3a975dcb4b16db3c1235cd536d1912ecd 100644 (file)
--- a/drivers/infiniband/hw/irdma/verbs.c
+++ b/drivers/infiniband/hw/irdma/verbs.c
@@ -2624,7 +2624,8 @@ static int irdma_hw_alloc_stag(struct irdma_device *iwdev,
                               struct irdma_mr *iwmr)
 {
        struct irdma_allocate_stag_info *info;
-       struct irdma_pd *iwpd = to_iwpd(iwmr->ibmr.pd);
+       struct ib_pd *pd = iwmr->ibmr.pd;
+       struct irdma_pd *iwpd = to_iwpd(pd);
        int status;
        struct irdma_cqp_request *cqp_request;
        struct cqp_cmds_info *cqp_info;
@@ -2640,6 +2641,7 @@ static int irdma_hw_alloc_stag(struct irdma_device *iwdev,
        info->stag_idx = iwmr->stag >> IRDMA_CQPSQ_STAG_IDX_S;
        info->pd_id = iwpd->sc_pd.pd_id;
        info->total_len = iwmr->len;
+       info->all_memory = pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY;
        info->remote_access = true;
        cqp_info->cqp_cmd = IRDMA_OP_ALLOC_STAG;
        cqp_info->post_sq = 1;
@@ -2687,6 +2689,8 @@ static struct ib_mr *irdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
        iwmr->type = IRDMA_MEMREG_TYPE_MEM;
        palloc = &iwpbl->pble_alloc;
        iwmr->page_cnt = max_num_sg;
+       /* Use system PAGE_SIZE as the sg page sizes are unknown at this point */
+       iwmr->len = max_num_sg * PAGE_SIZE;
        err_code = irdma_get_pble(iwdev->rf->pble_rsrc, palloc, iwmr->page_cnt,
                                  false);
        if (err_code)
@@ -2766,7 +2770,8 @@ static int irdma_hwreg_mr(struct irdma_device *iwdev, struct irdma_mr *iwmr,
 {
        struct irdma_pbl *iwpbl = &iwmr->iwpbl;
        struct irdma_reg_ns_stag_info *stag_info;
-       struct irdma_pd *iwpd = to_iwpd(iwmr->ibmr.pd);
+       struct ib_pd *pd = iwmr->ibmr.pd;
+       struct irdma_pd *iwpd = to_iwpd(pd);
        struct irdma_pble_alloc *palloc = &iwpbl->pble_alloc;
        struct irdma_cqp_request *cqp_request;
        struct cqp_cmds_info *cqp_info;
@@ -2785,6 +2790,7 @@ static int irdma_hwreg_mr(struct irdma_device *iwdev, struct irdma_mr *iwmr,
        stag_info->total_len = iwmr->len;
        stag_info->access_rights = irdma_get_mr_access(access);
        stag_info->pd_id = iwpd->sc_pd.pd_id;
+       stag_info->all_memory = pd->flags & IB_PD_UNSAFE_GLOBAL_RKEY;
        if (stag_info->access_rights & IRDMA_ACCESS_FLAGS_ZERO_BASED)
                stag_info->addr_type = IRDMA_ADDR_TYPE_ZERO_BASED;
        else