On Fri, Oct 30, 2020 at 5:39 PM Parav Pandit <parav@xxxxxxxxxx> wrote:
>
> A cited commit in fixes tag avoided setting dma_mask of the ib_device.
> Commit [1] made dma_mask as mandetory field to be setup even for
> dma_virt_ops based dma devices. Due to which below call trace occurred.
>
> Fix it by setting empty DMA MASK for software based RDMA devices.
>
> WARNING: CPU: 1 PID: 8488 at kernel/dma/mapping.c:149
> dma_map_page_attrs+0x493/0x700 kernel/dma/mapping.c:149 Modules linked in:
> CPU: 1 PID: 8488 Comm: syz-executor144 Not tainted 5.9.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine,
> BIOS Google 01/01/2011
> RIP: 0010:dma_map_page_attrs+0x493/0x700 kernel/dma/mapping.c:149
> Trace:
> dma_map_single_attrs include/linux/dma-mapping.h:279 [inline]
> ib_dma_map_single include/rdma/ib_verbs.h:3967 [inline]
> ib_mad_post_receive_mads+0x23f/0xd60
> drivers/infiniband/core/mad.c:2715
> ib_mad_port_start drivers/infiniband/core/mad.c:2862 [inline]
> ib_mad_port_open drivers/infiniband/core/mad.c:3016 [inline]
> ib_mad_init_device+0x72b/0x1400 drivers/infiniband/core/mad.c:3092
> add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:680
> enable_device_and_get+0x1d5/0x3c0
> drivers/infiniband/core/device.c:1301
> ib_register_device drivers/infiniband/core/device.c:1376 [inline]
> ib_register_device+0x7a7/0xa40 drivers/infiniband/core/device.c:1335
> rxe_register_device+0x46d/0x570
> drivers/infiniband/sw/rxe/rxe_verbs.c:1182
> rxe_add+0x12fe/0x16d0 drivers/infiniband/sw/rxe/rxe.c:247
> rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:507
> rxe_newlink drivers/infiniband/sw/rxe/rxe.c:269 [inline]
> rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:250
> nldev_newlink+0x30e/0x540 drivers/infiniband/core/nldev.c:1555
> rdma_nl_rcv_msg+0x367/0x690 drivers/infiniband/core/netlink.c:195
> rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
> rdma_nl_rcv+0x2f2/0x440 drivers/infiniband/core/netlink.c:259
> netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
> netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330
> netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919
> sock_sendmsg_nosec net/socket.c:651 [inline]
> sock_sendmsg+0xcf/0x120 net/socket.c:671
> ____sys_sendmsg+0x6e8/0x810 net/socket.c:2353
> ___sys_sendmsg+0xf3/0x170 net/socket.c:2407
> __sys_sendmsg+0xe5/0x1b0 net/socket.c:2440
> do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x443699
>
> [1] commit f959dcd6ddfd ("dma-direct: Fix potential NULL pointer dereference")
>
> Reported-by: syzbot+34dc2fea3478e659af01@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: e0477b34d9d1 ("RDMA: Explicitly pass in the dma_device to ib_register_device")
> Signed-off-by: Parav Pandit <parav@xxxxxxxxxx>
Thanks a lot. I have made tests and confirmed that this commit works very well.
Zhu Yanjun
> ---
> drivers/infiniband/sw/rdmavt/vt.c | 7 +++++--
> drivers/infiniband/sw/rxe/rxe_verbs.c | 6 +++++-
> drivers/infiniband/sw/siw/siw_main.c | 7 +++++--
> 3 files changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/infiniband/sw/rdmavt/vt.c b/drivers/infiniband/sw/rdmavt/vt.c
> index 43fbc4e54edf..5bd817490b1f 100644
> --- a/drivers/infiniband/sw/rdmavt/vt.c
> +++ b/drivers/infiniband/sw/rdmavt/vt.c
> @@ -525,6 +525,7 @@ static noinline int check_support(struct rvt_dev_info *rdi, int verb)
> int rvt_register_device(struct rvt_dev_info *rdi)
> {
> int ret = 0, i;
> + u64 dma_mask;
>
> if (!rdi)
> return -EINVAL;
> @@ -581,8 +582,10 @@ int rvt_register_device(struct rvt_dev_info *rdi)
>
> /* DMA Operations */
> rdi->ibdev.dev.dma_parms = rdi->ibdev.dev.parent->dma_parms;
> - dma_set_coherent_mask(&rdi->ibdev.dev,
> - rdi->ibdev.dev.parent->coherent_dma_mask);
> + dma_mask = IS_ENABLED(CONFIG_64BIT) ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32);
> + ret = dma_coerce_mask_and_coherent(&rdi->ibdev.dev, dma_mask);
> + if (ret)
> + goto bail_wss;
>
> /* Protection Domain */
> spin_lock_init(&rdi->n_pds_lock);
> diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
> index 7652d53af2c1..50ad3dded786 100644
> --- a/drivers/infiniband/sw/rxe/rxe_verbs.c
> +++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
> @@ -1128,6 +1128,7 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name)
> int err;
> struct ib_device *dev = &rxe->ib_dev;
> struct crypto_shash *tfm;
> + u64 dma_mask;
>
> strlcpy(dev->node_desc, "rxe", sizeof(dev->node_desc));
>
> @@ -1140,7 +1141,10 @@ int rxe_register_device(struct rxe_dev *rxe, const char *ibdev_name)
> rxe->ndev->dev_addr);
> dev->dev.dma_parms = &rxe->dma_parms;
> dma_set_max_seg_size(&dev->dev, UINT_MAX);
> - dma_set_coherent_mask(&dev->dev, dma_get_required_mask(&dev->dev));
> + dma_mask = IS_ENABLED(CONFIG_64BIT) ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32);
> + err = dma_coerce_mask_and_coherent(&dev->dev, dma_mask);
> + if (err)
> + return err;
>
> dev->uverbs_cmd_mask |= BIT_ULL(IB_USER_VERBS_CMD_REQ_NOTIFY_CQ);
>
> diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
> index e49faefdee92..6fe120187238 100644
> --- a/drivers/infiniband/sw/siw/siw_main.c
> +++ b/drivers/infiniband/sw/siw/siw_main.c
> @@ -306,6 +306,7 @@ static struct siw_device *siw_device_create(struct net_device *netdev)
> struct siw_device *sdev = NULL;
> struct ib_device *base_dev;
> struct device *parent = netdev->dev.parent;
> + u64 dma_mask;
> int rv;
>
> if (!parent) {
> @@ -360,8 +361,10 @@ static struct siw_device *siw_device_create(struct net_device *netdev)
> base_dev->dev.parent = parent;
> base_dev->dev.dma_parms = &sdev->dma_parms;
> dma_set_max_seg_size(&base_dev->dev, UINT_MAX);
> - dma_set_coherent_mask(&base_dev->dev,
> - dma_get_required_mask(&base_dev->dev));
> + dma_mask = IS_ENABLED(CONFIG_64BIT) ? DMA_BIT_MASK(64) : DMA_BIT_MASK(32);
> + if (dma_coerce_mask_and_coherent(&base_dev->dev, dma_mask))
> + goto error;
> +
> base_dev->num_comp_vectors = num_possible_cpus();
>
> xa_init_flags(&sdev->qp_xa, XA_FLAGS_ALLOC1);
> --
> 2.26.2
>
