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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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10
drivers/char/misc.c
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@@ -263,12 +263,14 @@ int misc_deregister(struct miscdevice *misc)
EXPORT_SYMBOL(misc_register);
EXPORT_SYMBOL(misc_deregister);
static char *misc_nodename(struct device *dev)
static char *misc_devnode(struct device *dev, mode_t *mode)
{
struct miscdevice *c = dev_get_drvdata(dev);
if (c->devnode)
return kstrdup(c->devnode, GFP_KERNEL);
if (mode && c->mode)
*mode = c->mode;
if (c->nodename)
return kstrdup(c->nodename, GFP_KERNEL);
return NULL;
}
@@ -287,7 +289,7 @@ static int __init misc_init(void)
err = -EIO;
if (register_chrdev(MISC_MAJOR,"misc",&misc_fops))
goto fail_printk;
misc_class->nodename = misc_nodename;
misc_class->devnode = misc_devnode;
return 0;
fail_printk: