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| author | Kay Sievers <kay.sievers@vrfy.org> | 2009-09-18 23:01:12 +0200 |
|---|---|---|
| committer | Live-CD User <linux@linux.site> | 2009-09-19 12:50:38 -0700 |
| commit | e454cea20bdcff10ee698d11b8882662a0153a47 (patch) | |
| tree | f44581fe57787aef0a4f4dc00993a90ea8e688f6 /drivers/base/devtmpfs.c | |
| parent | 78f28b7c555359c67c2a0d23f7436e915329421e (diff) | |
| download | linux-e454cea20bdcff10ee698d11b8882662a0153a47.tar.bz2 | |
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.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index fd488ad4263a..a1cb5afe6801 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; |