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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 12:50:38 -0700
commite454cea20bdcff10ee698d11b8882662a0153a47 (patch)
treef44581fe57787aef0a4f4dc00993a90ea8e688f6 /drivers/char/mem.c
parent78f28b7c555359c67c2a0d23f7436e915329421e (diff)
downloadlinux-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/char/mem.c')
-rw-r--r--drivers/char/mem.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 0491cdf63f2a..0aede1d6a9ea 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -866,24 +866,25 @@ static const struct file_operations kmsg_fops = {
static const struct memdev {
const char *name;
+ mode_t mode;
const struct file_operations *fops;
struct backing_dev_info *dev_info;
} devlist[] = {
- [ 1] = { "mem", &mem_fops, &directly_mappable_cdev_bdi },
+ [1] = { "mem", 0, &mem_fops, &directly_mappable_cdev_bdi },
#ifdef CONFIG_DEVKMEM
- [ 2] = { "kmem", &kmem_fops, &directly_mappable_cdev_bdi },
+ [2] = { "kmem", 0, &kmem_fops, &directly_mappable_cdev_bdi },
#endif
- [ 3] = {"null", &null_fops, NULL },
+ [3] = { "null", 0666, &null_fops, NULL },
#ifdef CONFIG_DEVPORT
- [ 4] = { "port", &port_fops, NULL },
+ [4] = { "port", 0, &port_fops, NULL },
#endif
- [ 5] = { "zero", &zero_fops, &zero_bdi },
- [ 7] = { "full", &full_fops, NULL },
- [ 8] = { "random", &random_fops, NULL },
- [ 9] = { "urandom", &urandom_fops, NULL },
- [11] = { "kmsg", &kmsg_fops, NULL },
+ [5] = { "zero", 0666, &zero_fops, &zero_bdi },
+ [7] = { "full", 0666, &full_fops, NULL },
+ [8] = { "random", 0666, &random_fops, NULL },
+ [9] = { "urandom", 0666, &urandom_fops, NULL },
+ [11] = { "kmsg", 0, &kmsg_fops, NULL },
#ifdef CONFIG_CRASH_DUMP
- [12] = { "oldmem", &oldmem_fops, NULL },
+ [12] = { "oldmem", 0, &oldmem_fops, NULL },
#endif
};
@@ -920,6 +921,13 @@ static const struct file_operations memory_fops = {
.open = memory_open,
};
+static char *mem_devnode(struct device *dev, mode_t *mode)
+{
+ if (mode && devlist[MINOR(dev->devt)].mode)
+ *mode = devlist[MINOR(dev->devt)].mode;
+ return NULL;
+}
+
static struct class *mem_class;
static int __init chr_dev_init(void)
@@ -935,6 +943,7 @@ static int __init chr_dev_init(void)
printk("unable to get major %d for memory devs\n", MEM_MAJOR);
mem_class = class_create(THIS_MODULE, "mem");
+ mem_class->devnode = mem_devnode;
for (minor = 1; minor < ARRAY_SIZE(devlist); minor++) {
if (!devlist[minor].name)
continue;