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s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Y8tRh8UuVncP1ncRA8ZfIPgOhX9+nAfsBu2vnbYNOEE=; b=lnh7lpD8ibzhZuxFp8rRUK1hF6KS8Ib5EGngea/dRLPITodQwSbUMMamSdovpwpYhD ZOixlUgEACA5anbErROpfawSUYRm19K4ynpADKz6Rzs7etbFMn0ey6Mf32TXBVSyYd3j 70AePxzhCMbKbEWcOBEJt/62fYQpLpGFQWndTF/6LB4xjkYDsoPp5J9xiw+l7b01XU5u 0oM2dAQUsEneSZe0JQT/Fmf1zgFFVR5IgaYMQ49qkLJPF/2TT3qLnCh+q2RBhTqqyy6t +RNh3FdwjXQ+C94uPY3qlnFuS3zAOg/v/XvPWvojDEwQozNABvAY1CtT1QA6JWHNYQ3/ ZMBg== X-Gm-Message-State: APjAAAXrT9+tTv3Tszud6m9czozm8rZtJWzQa5uJ6UqHpzPS6SfVG5vl s9JmKwa1yyoZumztymP/V7ckC+zARZV0/DKQwAJ9RHSQovUiNTTSdgEzbWhuEmfmBAnoOGU8560 O8OUO2Z2qZVGzzs+mwLpLdt7l7UHiIbaQQsgyk023Nxu5i32EZZUZnPi25qD0MsBcn+UkVYZtDH lLn/wApBSxk65JLME= X-Google-Smtp-Source: APXvYqzz/ntPC10OZ0frdLABrSNi7hvZ/ytx4Ex3aaENCq428cafLYJMM+5BmbKZZkSR6QrCbMGhJA3iBNJvNJC5 X-Received: by 2002:a9f:25c6:: with SMTP id 64mr157298uaf.36.1559580966349; Mon, 03 Jun 2019 09:56:06 -0700 (PDT) Date: Mon, 3 Jun 2019 18:55:15 +0200 In-Reply-To: Message-Id: <31821f3538ddacb7e57e0248e86a3d28f9789d2f.1559580831.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v16 13/16] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190603_095608_644441_CB75C1E4 X-CRM114-Status: GOOD ( 14.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Szabolcs Nagy , Catalin Marinas , Will Deacon , Kostya Serebryany , Khalid Aziz , Mauro Carvalho Chehab , Felix Kuehling , Vincenzo Frascino , Jacob Bramley , Leon Romanovsky , Christoph Hellwig , Jason Gunthorpe , Dave Martin , Evgeniy Stepanov , Kevin Brodsky , Kees Cook , Ruben Ayrapetyan , Andrey Konovalov , Ramana Radhakrishnan , Alex Williamson , Mauro Carvalho Chehab , Dmitry Vyukov , Greg Kroah-Hartman , Yishai Hadas , Jens Wiklander , Lee Smith , Alexander Deucher , Andrew Morton , enh , Robin Murphy , Christian Koenig , Luc Van Oostenryck Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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. videobuf_dma_contig_user_get() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag the pointers in this function. Acked-by: Mauro Carvalho Chehab Signed-off-by: Andrey Konovalov Reviewed-by: Kees Cook --- drivers/media/v4l2-core/videobuf-dma-contig.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c index e1bf50df4c70..8a1ddd146b17 100644 --- a/drivers/media/v4l2-core/videobuf-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf-dma-contig.c @@ -160,6 +160,7 @@ static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem) static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, struct videobuf_buffer *vb) { + unsigned long untagged_baddr = untagged_addr(vb->baddr); struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long prev_pfn, this_pfn; @@ -167,22 +168,22 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, unsigned int offset; int ret; - offset = vb->baddr & ~PAGE_MASK; + offset = untagged_baddr & ~PAGE_MASK; mem->size = PAGE_ALIGN(vb->size + offset); ret = -EINVAL; down_read(&mm->mmap_sem); - vma = find_vma(mm, vb->baddr); + vma = find_vma(mm, untagged_baddr); if (!vma) goto out_up; - if ((vb->baddr + mem->size) > vma->vm_end) + if ((untagged_baddr + mem->size) > vma->vm_end) goto out_up; pages_done = 0; prev_pfn = 0; /* kill warning */ - user_address = vb->baddr; + user_address = untagged_baddr; while (pages_done < (mem->size >> PAGE_SHIFT)) { ret = follow_pfn(vma, user_address, &this_pfn);