From: Souptick Joarder <jrdr.linux@gmail.com>
To: akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com,
boris.ostrovsky@oracle.com, jgross@suse.com,
linux@armlinux.org.uk, robin.murphy@arm.com
Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: [PATCHv2 8/9] xen/gntdev.c: Convert to use vm_insert_range
Date: Thu, 31 Jan 2019 08:44:05 +0530 [thread overview]
Message-ID: <20190131031405.GA2418@jordon-HP-15-Notebook-PC> (raw)
Convert to use vm_insert_range() to map range of kernel
memory to user vma.
map->count is passed to vm_insert_range and internal API
verify map->count against count ( count = vma_pages(vma))
for page array boundary overrun. With this count is not
needed inside gntdev_mmap() and it could be replaced with
vma_pages(vma).
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
drivers/xen/gntdev.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 5efc5ee..a930309 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -1082,18 +1082,17 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
{
struct gntdev_priv *priv = flip->private_data;
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;
pr_debug("map %d+%d at %lx (pgoff %lx)\n",
- index, count, vma->vm_start, vma->vm_pgoff);
+ index, vma_pages(vma), vma->vm_start, vma->vm_pgoff);
mutex_lock(&priv->lock);
- map = gntdev_find_map_index(priv, index, count);
+ map = gntdev_find_map_index(priv, index, vma_pages(vma));
if (!map)
goto unlock_out;
if (use_ptemod && map->vma)
@@ -1145,12 +1144,9 @@ 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_insert_range(vma, map->pages, map->count);
+ if (err)
+ goto out_put_map;
} else {
#ifdef CONFIG_X86
/*
--
1.9.1
reply other threads:[~2019-01-31 3:09 UTC|newest]
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