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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 21:50:38 +0200
commite454cea20bdcff10ee698d11b8882662a0153a47 (patch)
treef44581fe57787aef0a4f4dc00993a90ea8e688f6 /drivers/base/core.c
parentMerge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/k... (diff)
downloadlinux-e454cea20bdcff10ee698d11b8882662a0153a47.tar.xz
linux-e454cea20bdcff10ee698d11b8882662a0153a47.zip
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/core.c')
-rw-r--r--drivers/base/core.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 390e664ec1c7..6bee6af8d8e1 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -166,13 +166,16 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
if (MAJOR(dev->devt)) {
const char *tmp;
const char *name;
+ mode_t mode = 0;
add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
- name = device_get_nodename(dev, &tmp);
+ name = device_get_devnode(dev, &mode, &tmp);
if (name) {
add_uevent_var(env, "DEVNAME=%s", name);
kfree(tmp);
+ if (mode)
+ add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
}
}
@@ -1148,8 +1151,9 @@ static struct device *next_device(struct klist_iter *i)
}
/**
- * device_get_nodename - path of device node file
+ * device_get_devnode - path of device node file
* @dev: device
+ * @mode: returned file access mode
* @tmp: possibly allocated string
*
* Return the relative path of a possible device node.
@@ -1157,21 +1161,22 @@ static struct device *next_device(struct klist_iter *i)
* a name. This memory is returned in tmp and needs to be
* freed by the caller.
*/
-const char *device_get_nodename(struct device *dev, const char **tmp)
+const char *device_get_devnode(struct device *dev,
+ mode_t *mode, const char **tmp)
{
char *s;
*tmp = NULL;
/* the device type may provide a specific name */
- if (dev->type && dev->type->nodename)
- *tmp = dev->type->nodename(dev);
+ if (dev->type && dev->type->devnode)
+ *tmp = dev->type->devnode(dev, mode);
if (*tmp)
return *tmp;
/* the class may provide a specific name */
- if (dev->class && dev->class->nodename)
- *tmp = dev->class->nodename(dev);
+ if (dev->class && dev->class->devnode)
+ *tmp = dev->class->devnode(dev, mode);
if (*tmp)
return *tmp;