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authorPavel Emelyanov <xemul@openvz.org>2008-06-05 22:46:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-06 11:29:11 -0700
commit7db9cfd380205f6b50afdc3bc3619f876a5eaf0d (patch)
tree270b0212f0501b2dcf927e92e7374aba79c909df
parentcc9cb219aac24ffc711566c8f372c2b3a3bf840f (diff)
devscgroup: check for device permissions at mount time
Currently even if a task sits in an all-denied cgroup it can still mount any block device in any mode it wants. Put a proper check in do_open for block device to prevent this. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Tested-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/block_dev.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 7d822fae776..470c10ceb0f 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -12,6 +12,7 @@
#include <linux/kmod.h>
#include <linux/major.h>
#include <linux/smp_lock.h>
+#include <linux/device_cgroup.h>
#include <linux/highmem.h>
#include <linux/blkdev.h>
#include <linux/module.h>
@@ -928,9 +929,14 @@ static int do_open(struct block_device *bdev, struct file *file, int for_part)
{
struct module *owner = NULL;
struct gendisk *disk;
- int ret = -ENXIO;
+ int ret;
int part;
+ ret = devcgroup_inode_permission(bdev->bd_inode, file->f_mode);
+ if (ret != 0)
+ return ret;
+
+ ret = -ENXIO;
file->f_mapping = bdev->bd_inode->i_mapping;
lock_kernel();
disk = get_gendisk(bdev->bd_dev, &part);