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Driver-Core: extend devnode callbacks to provide permissions

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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>
This commit is contained in:
Kay Sievers
2009-09-18 23:01:12 +02:00
committed by Live-CD User
parent 78f28b7c55
commit e454cea20b
30 changed files with 116 additions and 79 deletions
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19
drivers/base/core.c
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@@ -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;