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[209.85.220.65]) by mx.google.com with SMTPS id x6sor65833312pll.8.2019.04.16.04.47.52 for (Google Transport Security); Tue, 16 Apr 2019 04:47:53 -0700 (PDT) Received-SPF: pass (google.com: domain of jrdr.linux@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=G+5l6dnj; spf=pass (google.com: domain of jrdr.linux@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=jrdr.linux@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=n/NDS47nz9uuNytg4LeJJ+li959uQqsTwzm1mhrxiWA=; b=G+5l6dnjc7/uWHI49g5xNQ2VmQniZgrpDhtRlmcY+E3Z7ocVubcskS2MrTMRU9ZU1N L0ULzCh7L5KPDeVBbv3aI560DkAoMSHXT8dUm7C87hk2rUJYuZjB2G4yctoncZH8pt8T pH8fBdXKGlqeyQtXK33z7+r6JJdj8JD8M2WURaPvOg1JOtMj1vqV37D3kv/8KcRwNk9w o1d45pjV17t0tKE7c3wu7swo2BTkJ5qq3mPBKXgANsJyDy8TaZkptEOEnjJW3sUylrgB WWAIvs6OK4hoNr5DfAjomWAvTR66t3MVa9o0AY56ghuFufEyHnfQLWCwrELKiWG9EtlG 4vhg== X-Google-Smtp-Source: APXvYqz4waYiopA3l3q+r1qCFeqwSh3ZXJMr5uwqp8r036DYgcWkcY5QNT6ibdt+RI1A+3hXGE7RDg== X-Received: by 2002:a17:902:b210:: with SMTP id t16mr76931088plr.84.1555415272752; Tue, 16 Apr 2019 04:47:52 -0700 (PDT) Received: from jordon-HP-15-Notebook-PC.domain.name ([49.207.50.11]) by smtp.gmail.com with ESMTPSA id p6sm55942835pfd.122.2019.04.16.04.47.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 16 Apr 2019 04:47:51 -0700 (PDT) From: Souptick Joarder To: akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com, kirill.shutemov@linux.intel.com, vbabka@suse.cz, riel@surriel.com, sfr@canb.auug.org.au, rppt@linux.vnet.ibm.com, peterz@infradead.org, linux@armlinux.org.uk, robin.murphy@arm.com, iamjoonsoo.kim@lge.com, treding@nvidia.com, keescook@chromium.org, m.szyprowski@samsung.com, stefanr@s5r6.in-berlin.de, hjc@rock-chips.com, heiko@sntech.de, airlied@linux.ie, oleksandr_andrushchenko@epam.com, joro@8bytes.org, pawel@osciak.com, kyungmin.park@samsung.com, mchehab@kernel.org, boris.ostrovsky@oracle.com, jgross@suse.com Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux1394-devel@lists.sourceforge.net, dri-devel@lists.freedesktop.org, linux-rockchip@lists.infradead.org, xen-devel@lists.xen.org, iommu@lists.linux-foundation.org, linux-media@vger.kernel.org, Souptick Joarder Subject: [REBASE PATCH v5 8/9] xen/gntdev.c: Convert to use vm_map_pages() Date: Tue, 16 Apr 2019 17:19:49 +0530 Message-Id: <88e56e82d2db98705c2d842e9c9806c00b366d67.1552921225.git.jrdr.linux@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: References: In-Reply-To: References: 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: Content-Type: text/plain; charset="UTF-8" Message-ID: <20190416114949.23ZzURlB__gJkeiSzcf3LotQQc1MEKQDKyIGVUFU_Pg@z> Convert to use vm_map_pages() to map range of kernel memory to user vma. map->count is passed to vm_map_pages() and internal API verify map->count against count ( count = vma_pages(vma)) for page array boundary overrun condition. Signed-off-by: Souptick Joarder Reviewed-by: Boris Ostrovsky --- drivers/xen/gntdev.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 5efc5ee..5d64262 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -1084,7 +1084,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) int index = vma->vm_pgoff; int count = vma_pages(vma); struct gntdev_grant_map *map; - int i, err = -EINVAL; + int err = -EINVAL; if ((vma->vm_flags & VM_WRITE) && !(vma->vm_flags & VM_SHARED)) return -EINVAL; @@ -1145,12 +1145,9 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) goto out_put_map; if (!use_ptemod) { - for (i = 0; i < count; i++) { - err = vm_insert_page(vma, vma->vm_start + i*PAGE_SIZE, - map->pages[i]); - if (err) - goto out_put_map; - } + err = vm_map_pages(vma, map->pages, map->count); + if (err) + goto out_put_map; } else { #ifdef CONFIG_X86 /* -- 1.9.1