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[209.85.220.73]) by mx.google.com with SMTPS id i22sor7624119vsq.28.2019.07.23.10.59.42 for (Google Transport Security); Tue, 23 Jul 2019 10:59:42 -0700 (PDT) Received-SPF: pass (google.com: domain of 3dus3xqokchaobrfsmybjzuccuzs.qcazwbil-aayjoqy.cfu@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) client-ip=209.85.220.73; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=VYKldQtW; spf=pass (google.com: domain of 3dus3xqokchaobrfsmybjzuccuzs.qcazwbil-aayjoqy.cfu@flex--andreyknvl.bounces.google.com designates 209.85.220.73 as permitted sender) smtp.mailfrom=3DUs3XQoKCHAObRfSmYbjZUccUZS.QcaZWbil-aaYjOQY.cfU@flex--andreyknvl.bounces.google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=zUOcAU6p00loQ1nrwWD7GDrs3KRhifPlQNEkBCXrSQU=; b=VYKldQtWxdBSrLk5sLC9xz+aQwiA+p9laEjbuJhQ+y14MW59AQItVZb4XUBX4o3STS L9JnHbRkn9qNr1J9IZZM0iJZeAOF+VZrFXTsiwFOiScu2zQivLlflg4hR7bzjUfOiPul +YlOCB2JPa3W1380wQB/LrhFWVtaDyOhlYe6qKxweJSR67HRGh68c9IWX3GDOjZKGFb5 Q62/4pR5YzdGLIAhcCOdymu1+C97aJhL6hmlz2Cb/a02TQdVA66PchqiCSNf3yPDUKCI sPIwmB/L8x0Lmk1aIlxXadTx8+U7n7WnYlELCxDnDvSJNs7fU1kWK2fSsF6MBML60HXD zTzw== X-Google-Smtp-Source: APXvYqwKLPKDYRl/Wu0ROV1RQ4E/ZMl8ZV1EzuXeG4/TJA26mw9Ne5fKh3z8AD7u+iNI3pn1/I9GUafVuAQJAaix X-Received: by 2002:a67:d60e:: with SMTP id n14mr49253950vsj.213.1563904781800; Tue, 23 Jul 2019 10:59:41 -0700 (PDT) Date: Tue, 23 Jul 2019 19:58:48 +0200 In-Reply-To: Message-Id: <7969018013a67ddbbf784ac7afeea5a57b1e2bcb.1563904656.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.709.g102302147b-goog Subject: [PATCH v19 11/15] IB/mlx4: untag user pointers in mlx4_get_umem_mr From: Andrey Konovalov To: 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 Cc: 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 , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov , Jason Gunthorpe Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This patch is a part of a series that extends kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. mlx4_get_umem_mr() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Reviewed-by: Jason Gunthorpe Acked-by: Catalin Marinas Reviewed-by: Kees Cook Signed-off-by: Andrey Konovalov --- drivers/infiniband/hw/mlx4/mr.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/mlx4/mr.c b/drivers/infiniband/hw/mlx4/mr.c index 753479285ce9..6ae503cfc526 100644 --- a/drivers/infiniband/hw/mlx4/mr.c +++ b/drivers/infiniband/hw/mlx4/mr.c @@ -377,6 +377,7 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * again */ if (!ib_access_writable(access_flags)) { + unsigned long untagged_start = untagged_addr(start); struct vm_area_struct *vma; down_read(¤t->mm->mmap_sem); @@ -385,9 +386,9 @@ static struct ib_umem *mlx4_get_umem_mr(struct ib_udata *udata, u64 start, * cover the memory, but for now it requires a single vma to * entirely cover the MR to support RO mappings. */ - vma = find_vma(current->mm, start); - if (vma && vma->vm_end >= start + length && - vma->vm_start <= start) { + vma = find_vma(current->mm, untagged_start); + if (vma && vma->vm_end >= untagged_start + length && + vma->vm_start <= untagged_start) { if (vma->vm_flags & VM_WRITE) access_flags |= IB_ACCESS_LOCAL_WRITE; } else { -- 2.22.0.709.g102302147b-goog