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: [PATCH v4 8/9] xen/gntdev.c: Convert to use vm_map_pages()
Date: Fri, 15 Feb 2019 08:18:31 +0530 [thread overview]
Message-ID: <20190215024830.GA26477@jordon-HP-15-Notebook-PC> (raw)
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 <jrdr.linux@gmail.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
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
next reply other threads:[~2019-02-15 2:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 2:48 Souptick Joarder [this message]
2019-07-28 18:06 ` [Xen-devel] [PATCH v4 8/9] xen/gntdev.c: Convert to use vm_map_pages() Marek Marczykowski-Górecki
2019-07-29 8:05 ` Souptick Joarder
2019-07-29 8:32 ` Souptick Joarder
2019-07-29 13:36 ` Marek Marczykowski-Górecki
2019-07-30 6:03 ` Souptick Joarder
2019-07-30 14:05 ` Boris Ostrovsky
2019-07-30 14:22 ` Marek Marczykowski-Górecki
2019-07-30 14:52 ` Souptick Joarder
2019-07-30 15:01 ` Marek Marczykowski-Górecki
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