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[156.34.55.100]) by smtp.gmail.com with ESMTPSA id m40sm12874710qtm.2.2019.06.03.10.46.19 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 03 Jun 2019 10:46:19 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1hXr2J-00032t-AT; Mon, 03 Jun 2019 14:46:19 -0300 Date: Mon, 3 Jun 2019 14:46:19 -0300 From: Jason Gunthorpe To: Andrey Konovalov Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy Subject: Re: [PATCH v16 12/16] IB, arm64: untag user pointers in ib_uverbs_(re)reg_mr() Message-ID: <20190603174619.GC11474@ziepe.ca> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 03, 2019 at 06:55:14PM +0200, Andrey Konovalov wrote: > This patch is a part of a series that extends arm64 kernel ABI to allow to > pass tagged user pointers (with the top byte set to something else other > than 0x00) as syscall arguments. > > ib_uverbs_(re)reg_mr() use provided user pointers for vma lookups (through > e.g. mlx4_get_umem_mr()), which can only by done with untagged pointers. > > Untag user pointers in these functions. > > Signed-off-by: Andrey Konovalov > drivers/infiniband/core/uverbs_cmd.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c > index 5a3a1780ceea..f88ee733e617 100644 > +++ b/drivers/infiniband/core/uverbs_cmd.c > @@ -709,6 +709,8 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs) > if (ret) > return ret; > > + cmd.start = untagged_addr(cmd.start); > + > if ((cmd.start & ~PAGE_MASK) != (cmd.hca_va & ~PAGE_MASK)) > return -EINVAL; I feel like we shouldn't thave to do this here, surely the cmd.start should flow unmodified to get_user_pages, and gup should untag it? ie, this sort of direction for the IB code (this would be a giant patch, so I didn't have time to write it all, but I think it is much saner): diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index 54628ef879f0ce..7b3b736c87c253 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -193,7 +193,7 @@ EXPORT_SYMBOL(ib_umem_find_best_pgsz); * @access: IB_ACCESS_xxx flags for memory being pinned * @dmasync: flush in-flight DMA when the memory region is written */ -struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr, +struct ib_umem *ib_umem_get(struct ib_udata *udata, void __user *addr, size_t size, int access, int dmasync) { struct ib_ucontext *context; @@ -201,7 +201,7 @@ struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr, struct page **page_list; unsigned long lock_limit; unsigned long new_pinned; - unsigned long cur_base; + void __user *cur_base; struct mm_struct *mm; unsigned long npages; int ret; diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index 5a3a1780ceea4d..94389e7f12371f 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -735,7 +735,8 @@ static int ib_uverbs_reg_mr(struct uverbs_attr_bundle *attrs) } } - mr = pd->device->ops.reg_user_mr(pd, cmd.start, cmd.length, cmd.hca_va, + mr = pd->device->ops.reg_user_mr(pd, u64_to_user_ptr(cmd.start), + cmd.length, cmd.hca_va, cmd.access_flags, &attrs->driver_udata); if (IS_ERR(mr)) { diff --git a/drivers/infiniband/hw/mlx5/mr.c b/drivers/infiniband/hw/mlx5/mr.c index 4d033796dcfcc2..bddbb952082fc5 100644 --- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -786,7 +786,7 @@ static int mr_cache_max_order(struct mlx5_ib_dev *dev) } static int mr_umem_get(struct mlx5_ib_dev *dev, struct ib_udata *udata, - u64 start, u64 length, int access_flags, + void __user *start, u64 length, int access_flags, struct ib_umem **umem, int *npages, int *page_shift, int *ncont, int *order) { @@ -1262,8 +1262,8 @@ struct ib_mr *mlx5_ib_reg_dm_mr(struct ib_pd *pd, struct ib_dm *dm, attr->access_flags, mode); } -struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, - u64 virt_addr, int access_flags, +struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, void __user *start, + u64 length, u64 virt_addr, int access_flags, struct ib_udata *udata) { struct mlx5_ib_dev *dev = to_mdev(pd->device); diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index ec6446864b08e9..b3c8eaaa35c760 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -2464,8 +2464,8 @@ struct ib_device_ops { struct ib_mr *(*reg_user_mr)(struct ib_pd *pd, u64 start, u64 length, u64 virt_addr, int mr_access_flags, struct ib_udata *udata); - int (*rereg_user_mr)(struct ib_mr *mr, int flags, u64 start, u64 length, - u64 virt_addr, int mr_access_flags, + int (*rereg_user_mr)(struct ib_mr *mr, int flags, void __user *start, + u64 length, u64 virt_addr, int mr_access_flags, struct ib_pd *pd, struct ib_udata *udata); int (*dereg_mr)(struct ib_mr *mr, struct ib_udata *udata); struct ib_mr *(*alloc_mr)(struct ib_pd *pd, enum ib_mr_type mr_type,