From e454cea20bdcff10ee698d11b8882662a0153a47 Mon Sep 17 00:00:00 2001 From: Kay Sievers Date: Fri, 18 Sep 2009 23:01:12 +0200 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 19 ++++++++++++------- drivers/base/devtmpfs.c | 24 ++++++++++++++++-------- drivers/block/aoe/aoechr.c | 4 ++-- drivers/block/pktcdvd.c | 6 +++--- drivers/char/hw_random/core.c | 2 +- drivers/char/mem.c | 29 +++++++++++++++++++---------- drivers/char/misc.c | 10 ++++++---- drivers/char/raw.c | 4 ++-- drivers/char/tty_io.c | 11 +++++++++++ drivers/gpu/drm/drm_sysfs.c | 4 ++-- drivers/hid/usbhid/hiddev.c | 4 ++-- drivers/input/input.c | 4 ++-- drivers/md/dm-ioctl.c | 2 +- drivers/media/dvb/dvb-core/dvbdev.c | 4 ++-- drivers/net/tun.c | 2 +- drivers/usb/class/usblp.c | 4 ++-- drivers/usb/core/file.c | 8 ++++---- drivers/usb/core/usb.c | 4 ++-- drivers/usb/misc/iowarrior.c | 4 ++-- drivers/usb/misc/legousbtower.c | 4 ++-- 20 files changed, 94 insertions(+), 59 deletions(-) (limited to 'drivers') diff --git a/drivers/base/core.c b/drivers/base/core.c index 390e664ec1c..6bee6af8d8e 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; diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c index fd488ad4263..a1cb5afe680 100644 --- a/drivers/base/devtmpfs.c +++ b/drivers/base/devtmpfs.c @@ -6,9 +6,10 @@ * During bootup, before any driver core device is registered, * devtmpfs, a tmpfs-based filesystem is created. Every driver-core * device which requests a device node, will add a node in this - * filesystem. The node is named after the the name of the device, - * or the susbsytem can provide a custom name. All devices are - * owned by root and have a mode of 0600. + * filesystem. + * By default, all devices are named after the the name of the + * device, owned by root and have a default mode of 0600. Subsystems + * can overwrite the default setting if needed. */ #include @@ -20,6 +21,7 @@ #include #include #include +#include #include static struct vfsmount *dev_mnt; @@ -134,7 +136,7 @@ int devtmpfs_create_node(struct device *dev) const char *tmp = NULL; const char *nodename; const struct cred *curr_cred; - mode_t mode; + mode_t mode = 0; struct nameidata nd; struct dentry *dentry; int err; @@ -142,14 +144,16 @@ int devtmpfs_create_node(struct device *dev) if (!dev_mnt) return 0; - nodename = device_get_nodename(dev, &tmp); + nodename = device_get_devnode(dev, &mode, &tmp); if (!nodename) return -ENOMEM; + if (mode == 0) + mode = 0600; if (is_blockdev(dev)) - mode = S_IFBLK|0600; + mode |= S_IFBLK; else - mode = S_IFCHR|0600; + mode |= S_IFCHR; curr_cred = override_creds(&init_cred); err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt, @@ -165,8 +169,12 @@ int devtmpfs_create_node(struct device *dev) dentry = lookup_create(&nd, 0); if (!IS_ERR(dentry)) { + int umask; + + umask = sys_umask(0000); err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, dev->devt); + sys_umask(umask); /* mark as kernel created inode */ if (!err) dentry->d_inode->i_private = &dev_mnt; @@ -271,7 +279,7 @@ int devtmpfs_delete_node(struct device *dev) if (!dev_mnt) return 0; - nodename = device_get_nodename(dev, &tmp); + nodename = device_get_devnode(dev, NULL, &tmp); if (!nodename) return -ENOMEM; diff --git a/drivers/block/aoe/aoechr.c b/drivers/block/aoe/aoechr.c index 19888354188..62141ec09a2 100644 --- a/drivers/block/aoe/aoechr.c +++ b/drivers/block/aoe/aoechr.c @@ -266,7 +266,7 @@ static const struct file_operations aoe_fops = { .owner = THIS_MODULE, }; -static char *aoe_nodename(struct device *dev) +static char *aoe_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "etherd/%s", dev_name(dev)); } @@ -288,7 +288,7 @@ aoechr_init(void) unregister_chrdev(AOE_MAJOR, "aoechr"); return PTR_ERR(aoe_class); } - aoe_class->nodename = aoe_nodename; + aoe_class->devnode = aoe_devnode; for (i = 0; i < ARRAY_SIZE(chardevs); ++i) device_create(aoe_class, NULL, diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 95f11cdef20..fd5bb8ad59a 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2857,7 +2857,7 @@ static struct block_device_operations pktcdvd_ops = { .media_changed = pkt_media_changed, }; -static char *pktcdvd_nodename(struct gendisk *gd) +static char *pktcdvd_devnode(struct gendisk *gd, mode_t *mode) { return kasprintf(GFP_KERNEL, "pktcdvd/%s", gd->disk_name); } @@ -2914,7 +2914,7 @@ static int pkt_setup_dev(dev_t dev, dev_t* pkt_dev) disk->fops = &pktcdvd_ops; disk->flags = GENHD_FL_REMOVABLE; strcpy(disk->disk_name, pd->name); - disk->nodename = pktcdvd_nodename; + disk->devnode = pktcdvd_devnode; disk->private_data = pd; disk->queue = blk_alloc_queue(GFP_KERNEL); if (!disk->queue) @@ -3070,7 +3070,7 @@ static const struct file_operations pkt_ctl_fops = { static struct miscdevice pkt_misc = { .minor = MISC_DYNAMIC_MINOR, .name = DRIVER_NAME, - .name = "pktcdvd/control", + .nodename = "pktcdvd/control", .fops = &pkt_ctl_fops }; diff --git a/drivers/char/hw_random/core.c b/drivers/char/hw_random/core.c index fc93e2fc7c7..1573aebd54b 100644 --- a/drivers/char/hw_random/core.c +++ b/drivers/char/hw_random/core.c @@ -153,7 +153,7 @@ static const struct file_operations rng_chrdev_ops = { static struct miscdevice rng_miscdev = { .minor = RNG_MISCDEV_MINOR, .name = RNG_MODULE_NAME, - .devnode = "hwrng", + .nodename = "hwrng", .fops = &rng_chrdev_ops, }; diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 0491cdf63f2..0aede1d6a9e 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; diff --git a/drivers/char/misc.c b/drivers/char/misc.c index 62c99fa59e2..1ee27cc2342 100644 --- a/drivers/char/misc.c +++ b/drivers/char/misc.c @@ -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: diff --git a/drivers/char/raw.c b/drivers/char/raw.c index 40268db02e2..64acd05f71c 100644 --- a/drivers/char/raw.c +++ b/drivers/char/raw.c @@ -261,7 +261,7 @@ static const struct file_operations raw_ctl_fops = { static struct cdev raw_cdev; -static char *raw_nodename(struct device *dev) +static char *raw_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "raw/%s", dev_name(dev)); } @@ -289,7 +289,7 @@ static int __init raw_init(void) ret = PTR_ERR(raw_class); goto error_region; } - raw_class->nodename = raw_nodename; + raw_class->devnode = raw_devnode; device_create(raw_class, NULL, MKDEV(RAW_MAJOR, 0), NULL, "rawctl"); return 0; diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index a3afa0c387c..c70d9dabefa 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -3056,11 +3056,22 @@ void __init console_init(void) } } +static char *tty_devnode(struct device *dev, mode_t *mode) +{ + if (!mode) + return NULL; + if (dev->devt == MKDEV(TTYAUX_MAJOR, 0) || + dev->devt == MKDEV(TTYAUX_MAJOR, 2)) + *mode = 0666; + return NULL; +} + static int __init tty_class_init(void) { tty_class = class_create(THIS_MODULE, "tty"); if (IS_ERR(tty_class)) return PTR_ERR(tty_class); + tty_class->devnode = tty_devnode; return 0; } diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c index f7a615b80c7..5301f226cb1 100644 --- a/drivers/gpu/drm/drm_sysfs.c +++ b/drivers/gpu/drm/drm_sysfs.c @@ -76,7 +76,7 @@ static ssize_t version_show(struct class *dev, char *buf) CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE); } -static char *drm_nodename(struct device *dev) +static char *drm_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev)); } @@ -112,7 +112,7 @@ struct class *drm_sysfs_create(struct module *owner, char *name) if (err) goto err_out_class; - class->nodename = drm_nodename; + class->devnode = drm_devnode; return class; diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index 4d1dc0cf140..8b6ee247bfe 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -852,14 +852,14 @@ static const struct file_operations hiddev_fops = { #endif }; -static char *hiddev_nodename(struct device *dev) +static char *hiddev_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); } static struct usb_class_driver hiddev_class = { .name = "hiddev%d", - .nodename = hiddev_nodename, + .devnode = hiddev_devnode, .fops = &hiddev_fops, .minor_base = HIDDEV_MINOR_BASE, }; diff --git a/drivers/input/input.c b/drivers/input/input.c index 851791d955f..556539d617a 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -1265,14 +1265,14 @@ static struct device_type input_dev_type = { .uevent = input_dev_uevent, }; -static char *input_nodename(struct device *dev) +static char *input_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev)); } struct class input_class = { .name = "input", - .nodename = input_nodename, + .devnode = input_devnode, }; EXPORT_SYMBOL_GPL(input_class); diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 7f77f18fcaf..a6794293158 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1532,7 +1532,7 @@ static const struct file_operations _ctl_fops = { static struct miscdevice _dm_misc = { .minor = MISC_DYNAMIC_MINOR, .name = DM_NAME, - .devnode = "mapper/control", + .nodename = "mapper/control", .fops = &_ctl_fops }; diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c index 479dd05762a..94159b90f73 100644 --- a/drivers/media/dvb/dvb-core/dvbdev.c +++ b/drivers/media/dvb/dvb-core/dvbdev.c @@ -447,7 +447,7 @@ static int dvb_uevent(struct device *dev, struct kobj_uevent_env *env) return 0; } -static char *dvb_nodename(struct device *dev) +static char *dvb_devnode(struct device *dev, mode_t *mode) { struct dvb_device *dvbdev = dev_get_drvdata(dev); @@ -478,7 +478,7 @@ static int __init init_dvbdev(void) goto error; } dvb_class->dev_uevent = dvb_uevent; - dvb_class->nodename = dvb_nodename; + dvb_class->devnode = dvb_devnode; return 0; error: diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 3f5d28851aa..d3ee1994b02 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1370,7 +1370,7 @@ static const struct file_operations tun_fops = { static struct miscdevice tun_miscdev = { .minor = TUN_MINOR, .name = "tun", - .devnode = "net/tun", + .nodename = "net/tun", .fops = &tun_fops, }; diff --git a/drivers/usb/class/usblp.c b/drivers/usb/class/usblp.c index 26c09f0257d..9bc112ee780 100644 --- a/drivers/usb/class/usblp.c +++ b/drivers/usb/class/usblp.c @@ -1057,14 +1057,14 @@ static const struct file_operations usblp_fops = { .release = usblp_release, }; -static char *usblp_nodename(struct device *dev) +static char *usblp_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); } static struct usb_class_driver usblp_class = { .name = "lp%d", - .nodename = usblp_nodename, + .devnode = usblp_devnode, .fops = &usblp_fops, .minor_base = USBLP_MINOR_BASE, }; diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c index 5cef88929b3..222ee07ea68 100644 --- a/drivers/usb/core/file.c +++ b/drivers/usb/core/file.c @@ -67,14 +67,14 @@ static struct usb_class { struct class *class; } *usb_class; -static char *usb_nodename(struct device *dev) +static char *usb_devnode(struct device *dev, mode_t *mode) { struct usb_class_driver *drv; drv = dev_get_drvdata(dev); - if (!drv || !drv->nodename) + if (!drv || !drv->devnode) return NULL; - return drv->nodename(dev); + return drv->devnode(dev, mode); } static int init_usb_class(void) @@ -100,7 +100,7 @@ static int init_usb_class(void) kfree(usb_class); usb_class = NULL; } - usb_class->class->nodename = usb_nodename; + usb_class->class->devnode = usb_devnode; exit: return result; diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index a26f73880c3..43ee943d757 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -311,7 +311,7 @@ static struct dev_pm_ops usb_device_pm_ops = { #endif /* CONFIG_PM */ -static char *usb_nodename(struct device *dev) +static char *usb_devnode(struct device *dev, mode_t *mode) { struct usb_device *usb_dev; @@ -324,7 +324,7 @@ struct device_type usb_device_type = { .name = "usb_device", .release = usb_release_dev, .uevent = usb_dev_uevent, - .nodename = usb_nodename, + .devnode = usb_devnode, .pm = &usb_device_pm_ops, }; diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 90e1a8dedfa..e75bb87ee92 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -727,7 +727,7 @@ static const struct file_operations iowarrior_fops = { .poll = iowarrior_poll, }; -static char *iowarrior_nodename(struct device *dev) +static char *iowarrior_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); } @@ -738,7 +738,7 @@ static char *iowarrior_nodename(struct device *dev) */ static struct usb_class_driver iowarrior_class = { .name = "iowarrior%d", - .nodename = iowarrior_nodename, + .devnode = iowarrior_devnode, .fops = &iowarrior_fops, .minor_base = IOWARRIOR_MINOR_BASE, }; diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c index c1e2433f640..97efeaec4d5 100644 --- a/drivers/usb/misc/legousbtower.c +++ b/drivers/usb/misc/legousbtower.c @@ -266,7 +266,7 @@ static const struct file_operations tower_fops = { .llseek = tower_llseek, }; -static char *legousbtower_nodename(struct device *dev) +static char *legousbtower_devnode(struct device *dev, mode_t *mode) { return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev)); } @@ -277,7 +277,7 @@ static char *legousbtower_nodename(struct device *dev) */ static struct usb_class_driver tower_class = { .name = "legousbtower%d", - .nodename = legousbtower_nodename, + .devnode = legousbtower_devnode, .fops = &tower_fops, .minor_base = LEGO_USB_TOWER_MINOR_BASE, }; -- cgit v1.2.3