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authorKay Sievers <kay.sievers@vrfy.org>2009-09-18 23:01:12 +0200
committerLive-CD User <linux@linux.site>2009-09-19 12:50:38 -0700
commite454cea20bdcff10ee698d11b8882662a0153a47 (patch)
treef44581fe57787aef0a4f4dc00993a90ea8e688f6 /drivers/base/devtmpfs.c
parent78f28b7c555359c67c2a0d23f7436e915329421e (diff)
downloadop-kernel-dev-e454cea20bdcff10ee698d11b8882662a0153a47.zip
op-kernel-dev-e454cea20bdcff10ee698d11b8882662a0153a47.tar.gz
Driver-Core: extend devnode callbacks to provide permissions
This allows subsytems to provide devtmpfs with non-default permissions for the device node. Instead of the default mode of 0600, null, zero, random, urandom, full, tty, ptmx now have a mode of 0666, which allows non-privileged processes to access standard device nodes in case no other userspace process applies the expected permissions. This also fixes a wrong assignment in pktcdvd and a checkpatch.pl complain. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/base/devtmpfs.c')
-rw-r--r--drivers/base/devtmpfs.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index fd488ad..a1cb5af 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -6,9 +6,10 @@
* During bootup, before any driver core device is registered,
* devtmpfs, a tmpfs-based filesystem is created. Every driver-core
* device which requests a device node, will add a node in this
- * filesystem. The node is named after the the name of the device,
- * or the susbsytem can provide a custom name. All devices are
- * owned by root and have a mode of 0600.
+ * filesystem.
+ * By default, all devices are named after the the name of the
+ * device, owned by root and have a default mode of 0600. Subsystems
+ * can overwrite the default setting if needed.
*/
#include <linux/kernel.h>
@@ -20,6 +21,7 @@
#include <linux/fs.h>
#include <linux/shmem_fs.h>
#include <linux/cred.h>
+#include <linux/sched.h>
#include <linux/init_task.h>
static struct vfsmount *dev_mnt;
@@ -134,7 +136,7 @@ int devtmpfs_create_node(struct device *dev)
const char *tmp = NULL;
const char *nodename;
const struct cred *curr_cred;
- mode_t mode;
+ mode_t mode = 0;
struct nameidata nd;
struct dentry *dentry;
int err;
@@ -142,14 +144,16 @@ int devtmpfs_create_node(struct device *dev)
if (!dev_mnt)
return 0;
- nodename = device_get_nodename(dev, &tmp);
+ nodename = device_get_devnode(dev, &mode, &tmp);
if (!nodename)
return -ENOMEM;
+ if (mode == 0)
+ mode = 0600;
if (is_blockdev(dev))
- mode = S_IFBLK|0600;
+ mode |= S_IFBLK;
else
- mode = S_IFCHR|0600;
+ mode |= S_IFCHR;
curr_cred = override_creds(&init_cred);
err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
@@ -165,8 +169,12 @@ int devtmpfs_create_node(struct device *dev)
dentry = lookup_create(&nd, 0);
if (!IS_ERR(dentry)) {
+ int umask;
+
+ umask = sys_umask(0000);
err = vfs_mknod(nd.path.dentry->d_inode,
dentry, mode, dev->devt);
+ sys_umask(umask);
/* mark as kernel created inode */
if (!err)
dentry->d_inode->i_private = &dev_mnt;
@@ -271,7 +279,7 @@ int devtmpfs_delete_node(struct device *dev)
if (!dev_mnt)
return 0;
- nodename = device_get_nodename(dev, &tmp);
+ nodename = device_get_devnode(dev, NULL, &tmp);
if (!nodename)
return -ENOMEM;
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