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Driver-Core: extend devnode callbacks to provide permissions

Browse source 
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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kay Sievers 2009-09-18 23:01:12 +02:00 • committed by Live-CD User
commit e454cea20b
30 changed files with 116 additions and 79 deletions
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4
arch/x86/kernel/cpuid.c
View file

@ -182,7 +182,7 @@ static struct notifier_block __refdata cpuid_class_cpu_notifier =
.notifier_call = cpuid_class_cpu_callback,
};
static char *cpuid_nodename(struct device *dev)
static char *cpuid_devnode(struct device *dev, mode_t *mode)
{
return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));
}
@ -203,7 +203,7 @@ static int __init cpuid_init(void)
err = PTR_ERR(cpuid_class);
goto out_chrdev;
}
cpuid_class->nodename = cpuid_nodename;
cpuid_class->devnode = cpuid_devnode;
for_each_online_cpu(i) {
err = cpuid_device_create(i);
if (err != 0)

2
arch/x86/kernel/microcode_core.c
View file

@ -236,7 +236,7 @@ static const struct file_operations microcode_fops = {
static struct miscdevice microcode_dev = {
.minor = MICROCODE_MINOR,
.name = "microcode",
.devnode = "cpu/microcode",
.nodename = "cpu/microcode",
.fops = &microcode_fops,
};

4
arch/x86/kernel/msr.c
View file

@ -241,7 +241,7 @@ static struct notifier_block __refdata msr_class_cpu_notifier = {
.notifier_call = msr_class_cpu_callback,
};
static char *msr_nodename(struct device *dev)
static char *msr_devnode(struct device *dev, mode_t *mode)
{
return kasprintf(GFP_KERNEL, "cpu/%u/msr", MINOR(dev->devt));
}
@ -262,7 +262,7 @@ static int __init msr_init(void)
err = PTR_ERR(msr_class);
goto out_chrdev;
}
msr_class->nodename = msr_nodename;
msr_class->devnode = msr_devnode;
for_each_online_cpu(i) {
err = msr_device_create(i);
if (err != 0)