[PATCH] cgroups: implement device whitelist lsm (v3)

Serge E. Hallyn
2008-03-13T14:42:27Z

Implement a cgroup using the LSM interface to enforce open and mknod
on device files.

This implements a simple device access whitelist. A whitelist entry
has 4 fields. 'type' is a (all), c (char), or b (block). 'all' means it
applies to all types, all major numbers, and all minor numbers. Major and
minor are obvious. Access is a composition of r (read), w (write), and
m (mknod).

The root devcgroup starts with rwm to 'all'. A child devcg gets a copy
of the parent. Admins can then add and remove devices to the whitelist.
Once CAP_HOST_ADMIN is introduced it will be needed to add entries as
well or remove entries from another cgroup, though just CAP_SYS_ADMIN
will suffice to remove entries for your own group.

An entry is added by doing "echo <type> <maj> <min> <access>" > devcg.allow,
for instance:

echo b 7 0 mrw > /cgroups/1/devcg.allow

An entry is removed by doing likewise into devcg.deny. Since this is a
pure whitelist, not acls, you can only remove entries which exist in the
whitelist. You must explicitly

echo a 0 0 mrw > /cgroups/1/devcg.deny

to remove the "allow all" entry which is automatically inherited from
the root cgroup.

While composing this with the ns_cgroup may seem logical, it is not
the right thing to do, because updates to /cg/cg1/devcg.deny are
not reflected in /cg/cg1/cg2/devcg.allow.

A task may only be moved to another devcgroup if it is moving to
a direct descendent of its current devcgroup.

CAP_NS_OVERRIDE is defined as the capability needed to cross namespaces.
A task needs both CAP_NS_OVERRIDE and CAP_SYS_ADMIN to create a new
devcgroup, update a devcgroup's access, or move a task to a new
devcgroup.

CONFIG_COMMONCAP is defined whenever security/commoncap.c should
be compiled, so that the decision of whether to show the option
for FILE_CAPABILITIES can be a bit cleaner.

Changelog:
Mar 13 2008: move the dev_cgroup support into
capability hooks instead of having it
as a separate security module.
Support root_plug with devcg.
Note that due to this change, devcg will
not be enforcing if the dummy module is
loaded, or if selinux is loaded without
capabilities.
Mar 12 2008: allow dev_cgroup lsm to be used when
SECURITY=n, and allow stacking with SELinux
and Smack. Don't work too hard in Kconfig
to prevent a warning when smack+devcg are
both compiled in, worry about that later.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
---
include/linux/capability.h | 11 +-
include/linux/cgroup_subsys.h | 6 +
include/linux/devcg.h | 69 +++++++
include/linux/security.h | 7 +-
init/Kconfig | 7 +
kernel/Makefile | 1 +
kernel/dev_cgroup.c | 411 +++++++++++++++++++++++++++++++++++++++++
security/Kconfig | 6 +-
security/Makefile | 12 +-
security/capability.c | 2 +
security/commoncap.c | 13 ++
security/dev_cgroup.c | 83 +++++++++
security/root_plug.c | 2 +
security/smack/smack_lsm.c | 5 +
14 files changed, 624 insertions(+), 11 deletions(-)
create mode 100644 include/linux/devcg.h
create mode 100644 kernel/dev_cgroup.c
create mode 100644 security/dev_cgroup.c

diff --git a/include/linux/capability.h b/include/linux/capability.h
index eaab759..f8ecba1 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -333,7 +333,16 @@ typedef struct kernel_cap_struct {

#define CAP_MAC_ADMIN 33

-#define CAP_LAST_CAP CAP_MAC_ADMIN
+/* Allow acting on resources in another namespace. In particular:
+ * 1. when combined with CAP_MKNOD and dev_cgroup is enabled,
+ * allow creation of devices not in the device whitelist.
+ * 2. whencombined with CAP_SYS_ADMIN and dev_cgroup is enabled,
+ * allow editing device cgroup whitelist
+ */
+
+#define CAP_NS_OVERRIDE 34
+
+#define CAP_LAST_CAP CAP_NS_OVERRIDE

#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 1ddebfc..01e8034 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -42,3 +42,9 @@ SUBSYS(mem_cgroup)
#endif

/* */
+
+#ifdef CONFIG_CGROUP_DEV
+SUBSYS(devcg)
+#endif
+
+/* */
diff --git a/include/linux/devcg.h b/include/linux/devcg.h
new file mode 100644
index 0000000..32e9f90
--- /dev/null
+++ b/include/linux/devcg.h
@@ -0,0 +1,69 @@
+#include <linux/module.h>
+#include <linux/cgroup.h>
+#include <linux/fs.h>
+#include <linux/list.h>
+#include <linux/security.h>
+
+#include <asm/uaccess.h>
+
+#define ACC_MKNOD 1
+#define ACC_READ 2
+#define ACC_WRITE 4
+
+#define DEV_BLOCK 1
+#define DEV_CHAR 2
+#define DEV_ALL 4 /* this represents all devices */
+
+#ifdef CONFIG_CGROUP_DEV
+/*
+ * whitelist locking rules:
+ * cgroup_lock() cannot be taken under cgroup->lock.
+ * cgroup->lock can be taken with or without cgroup_lock().
+ *
+ * modifications always require cgroup_lock
+ * modifications to a list which is visible require the
+ * cgroup->lock *and* cgroup_lock()
+ * walking the list requires cgroup->lock or cgroup_lock().
+ *
+ * reasoning: dev_whitelist_copy() needs to kmalloc, so needs
+ * a mutex, which the cgroup_lock() is. Since modifying
+ * a visible list requires both locks, either lock can be
+ * taken for walking the list. Since the wh->spinlock is taken
+ * for modifying a public-accessible list, the spinlock is
+ * sufficient for just walking the list.
+ */
+
+struct dev_whitelist_item {
+ u32 major, minor;
+ short type;
+ short access;
+ struct list_head list;
+};
+
+struct dev_cgroup {
+ struct cgroup_subsys_state css;
+ struct list_head whitelist;
+ spinlock_t lock;
+};
+
+static inline struct dev_cgroup *cgroup_to_devcg(
+ struct cgroup *cgroup)
+{
+ return container_of(cgroup_subsys_state(cgroup, devcg_subsys_id),
+ struct dev_cgroup, css);
+}
+
+extern struct cgroup_subsys devcg_subsys;
+
+extern int devcgroup_inode_permission(struct inode *inode, int mask,
+ struct nameidata *nd);
+extern int devcgroup_inode_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t dev);
+#else
+static inline int devcgroup_inode_permission(struct inode *inode, int mask,
+ struct nameidata *nd)
+{ return 0; }
+static inline int devcgroup_inode_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t dev)
+{ return 0; }
+#endif
diff --git a/include/linux/security.h b/include/linux/security.h
index 2231526..9d562b6 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -57,6 +57,8 @@ extern int cap_inode_setxattr(struct dentry *dentry, char *name, void *value, si
extern int cap_inode_removexattr(struct dentry *dentry, char *name);
extern int cap_inode_need_killpriv(struct dentry *dentry);
extern int cap_inode_killpriv(struct dentry *dentry);
+extern int cap_inode_permission(struct inode *inode, int mask, struct nameidata *nd);
+extern int cap_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
extern int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid, int flags);
extern void cap_task_reparent_to_init (struct task_struct *p);
extern int cap_task_kill(struct task_struct *p, struct siginfo *info, int sig, u32 secid);
@@ -1735,6 +1737,7 @@ int security_secctx_to_secid(char *secdata, u32 seclen, u32 *secid);
void security_release_secctx(char *secdata, u32 seclen);

#else /* CONFIG_SECURITY */
+
struct security_mnt_opts {
};

@@ -2011,7 +2014,7 @@ static inline int security_inode_mknod (struct inode *dir,
struct dentry *dentry,
int mode, dev_t dev)
{
- return 0;
+ return cap_inode_mknod(dir, dentry, mode, dev);
}

static inline int security_inode_rename (struct inode *old_dir,
@@ -2036,7 +2039,7 @@ static inline int security_inode_follow_link (struct dentry *dentry,
static inline int security_inode_permission (struct inode *inode, int mask,
struct nameidata *nd)
{
- return 0;
+ return cap_inode_permission(inode, mask, nd);
}

static inline int security_inode_setattr (struct dentry *dentry,
diff --git a/init/Kconfig b/init/Kconfig
index 009f2d8..05343a2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -298,6 +298,13 @@ config CGROUP_NS
for instance virtual servers and checkpoint/restart
jobs.

+config CGROUP_DEV
+ bool "Device controller for cgroups"
+ depends on CGROUPS && EXPERIMENTAL
+ help
+ Provides a cgroup implementing whitelists for devices which
+ a process in the cgroup can mknod or open.
+
config CPUSETS
bool "Cpuset support"
depends on SMP && CGROUPS
diff --git a/kernel/Makefile b/kernel/Makefile
index 9cc073e..74cd321 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -42,6 +42,7 @@ obj-$(CONFIG_CGROUPS) += cgroup.o
obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
+obj-$(CONFIG_CGROUP_DEV) += dev_cgroup.o
obj-$(CONFIG_UTS_NS) += utsname.o
obj-$(CONFIG_USER_NS) += user_namespace.o
obj-$(CONFIG_PID_NS) += pid_namespace.o
diff --git a/kernel/dev_cgroup.c b/kernel/dev_cgroup.c
new file mode 100644
index 0000000..f088824
--- /dev/null
+++ b/kernel/dev_cgroup.c
@@ -0,0 +1,411 @@
+/*
+ * dev_cgroup.c - device cgroup subsystem
+ *
+ * Copyright 2007 IBM Corp
+ */
+
+#include <linux/devcg.h>
+
+static int devcg_can_attach(struct cgroup_subsys *ss,
+ struct cgroup *new_cgroup, struct task_struct *task)
+{
+ struct cgroup *orig;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_NS_OVERRIDE))
+ return -EPERM;
+
+ if (current != task) {
+ if (!cgroup_is_descendant(new_cgroup))
+ return -EPERM;
+ }
+
+ if (atomic_read(&new_cgroup->count) != 0)
+ return -EPERM;
+
+ orig = task_cgroup(task, devcg_subsys_id);
+ if (orig && orig != new_cgroup->parent)
+ return -EPERM;
+
+ return 0;
+}
+
+/*
+ * called under cgroup_lock()
+ */
+int dev_whitelist_copy(struct list_head *dest, struct list_head *orig)
+{
+ struct dev_whitelist_item *wh, *tmp, *new;
+
+ list_for_each_entry(wh, orig, list) {
+ new = kmalloc(sizeof(*wh), GFP_KERNEL);
+ if (!new)
+ goto free_and_exit;
+ new->major = wh->major;
+ new->minor = wh->minor;
+ new->type = wh->type;
+ new->access = wh->access;
+ list_add_tail(&new->list, dest);
+ }
+
+ return 0;
+
+free_and_exit:
+ list_for_each_entry_safe(wh, tmp, dest, list) {
+ list_del(&wh->list);
+ kfree(wh);
+ }
+ return -ENOMEM;
+}
+
+/* Stupid prototype - don't bother combining existing entries */
+/*
+ * called under cgroup_lock()
+ * since the list is visible to other tasks, we need the spinlock also
+ */
+int dev_whitelist_add(struct dev_cgroup *dev_cgroup,
+ struct dev_whitelist_item *wh)
+{
+ struct dev_whitelist_item *whcopy;
+
+ whcopy = kmalloc(sizeof(*whcopy), GFP_KERNEL);
+ if (!whcopy)
+ return -ENOMEM;
+
+ memcpy(whcopy, wh, sizeof(*whcopy));
+ spin_lock(&dev_cgroup->lock);
+ list_add_tail(&whcopy->list, &dev_cgroup->whitelist);
+ spin_unlock(&dev_cgroup->lock);
+ return 0;
+}
+
+/*
+ * called under cgroup_lock()
+ * since the list is visible to other tasks, we need the spinlock also
+ */
+void dev_whitelist_rm(struct dev_cgroup *dev_cgroup,
+ struct dev_whitelist_item *wh)
+{
+ struct dev_whitelist_item *walk, *tmp;
+
+ spin_lock(&dev_cgroup->lock);
+ list_for_each_entry_safe(walk, tmp, &dev_cgroup->whitelist, list) {
+ if (walk->type == DEV_ALL)
+ goto remove;
+ if (walk->type != wh->type)
+ continue;
+ if (walk->major != ~0 && walk->major != wh->major)
+ continue;
+ if (walk->minor != ~0 && walk->minor != wh->minor)
+ continue;
+
+remove:
+ walk->access &= ~wh->access;
+ if (!walk->access) {
+ list_del(&walk->list);
+ kfree(walk);
+ }
+ }
+ spin_unlock(&dev_cgroup->lock);
+}
+
+/*
+ * Rules: you can only create a cgroup if
+ * 1. you are capable(CAP_SYS_ADMIN|CAP_NS_OVERRIDE)
+ * 2. the target cgroup is a descendant of your own cgroup
+ *
+ * Note: called from kernel/cgroup.c with cgroup_lock() held.
+ */
+static struct cgroup_subsys_state *devcg_create(struct cgroup_subsys *ss,
+ struct cgroup *cgroup)
+{
+ struct dev_cgroup *dev_cgroup, *parent_dev_cgroup;
+ struct cgroup *parent_cgroup;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_NS_OVERRIDE))
+ return ERR_PTR(-EPERM);
+ if (!cgroup_is_descendant(cgroup))
+ return ERR_PTR(-EPERM);
+
+ dev_cgroup = kzalloc(sizeof(*dev_cgroup), GFP_KERNEL);
+ if (!dev_cgroup)
+ return ERR_PTR(-ENOMEM);
+ INIT_LIST_HEAD(&dev_cgroup->whitelist);
+ parent_cgroup = cgroup->parent;
+
+ if (parent_cgroup == NULL) {
+ struct dev_whitelist_item *wh;
+ wh = kmalloc(sizeof(*wh), GFP_KERNEL);
+ wh->minor = wh->major = ~0;
+ wh->type = DEV_ALL;
+ wh->access = ACC_MKNOD | ACC_READ | ACC_WRITE;
+ list_add(&wh->list, &dev_cgroup->whitelist);
+ } else {
+ parent_dev_cgroup = cgroup_to_devcg(parent_cgroup);
+ ret = dev_whitelist_copy(&dev_cgroup->whitelist,
+ &parent_dev_cgroup->whitelist);
+ if (ret) {
+ kfree(dev_cgroup);
+ return ERR_PTR(ret);
+ }
+ }
+
+ spin_lock_init(&dev_cgroup->lock);
+ return &dev_cgroup->css;
+}
+
+static void devcg_destroy(struct cgroup_subsys *ss,
+ struct cgroup *cgroup)
+{
+ struct dev_cgroup *dev_cgroup;
+ struct dev_whitelist_item *wh, *tmp;
+
+ dev_cgroup = cgroup_to_devcg(cgroup);
+ list_for_each_entry_safe(wh, tmp, &dev_cgroup->whitelist, list) {
+ list_del(&wh->list);
+ kfree(wh);
+ }
+ kfree(dev_cgroup);
+}
+
+#define DEVCG_ALLOW 1
+#define DEVCG_DENY 2
+
+void set_access(char *acc, short access)
+{
+ int idx = 0;
+ memset(acc, 0, 4);
+ if (access & ACC_READ)
+ acc[idx++] = 'r';
+ if (access & ACC_WRITE)
+ acc[idx++] = 'w';
+ if (access & ACC_MKNOD)
+ acc[idx++] = 'm';
+}
+
+char type_to_char(short type)
+{
+ if (type == DEV_ALL)
+ return 'a';
+ if (type == DEV_CHAR)
+ return 'c';
+ if (type == DEV_BLOCK)
+ return 'b';
+ return 'X';
+}
+
+static void set_majmin(char *str, int len, unsigned m)
+{
+ memset(str, 0, len);
+ if (m == ~0)
+ sprintf(str, "*");
+ else
+ snprintf(str, len, "%d", m);
+}
+
+char *print_whitelist(struct dev_cgroup *devcgroup, int *len)
+{
+ char *buf, *s, acc[4];
+ struct dev_whitelist_item *wh;
+ int ret;
+ int count = 0;
+ char maj[10], min[10];
+
+ buf = kmalloc(4096, GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+ s = buf;
+ *s = '\0';
+ *len = 0;
+
+ spin_lock(&devcgroup->lock);
+ list_for_each_entry(wh, &devcgroup->whitelist, list) {
+ set_access(acc, wh->access);
+ set_majmin(maj, 10, wh->major);
+ set_majmin(min, 10, wh->minor);
+ ret = snprintf(s, 4095-(s-buf), "%c %s %s %s\n",
+ type_to_char(wh->type), maj, min, acc);
+ if (s+ret >= buf+4095) {
+ kfree(buf);
+ buf = ERR_PTR(-ENOMEM);
+ break;
+ }
+ s += ret;
+ *len += ret;
+ count++;
+ }
+ spin_unlock(&devcgroup->lock);
+
+ return buf;
+}
+
+static ssize_t devcg_access_read(struct cgroup *cgroup,
+ struct cftype *cft, struct file *file,
+ char __user *userbuf, size_t nbytes, loff_t *ppos)
+{
+ struct dev_cgroup *devcgrp = cgroup_to_devcg(cgroup);
+ int filetype = cft->private;
+ char *buffer;
+ int len, retval;
+
+ if (filetype != DEVCG_ALLOW)
+ return -EINVAL;
+ buffer = print_whitelist(devcgrp, &len);
+ if (IS_ERR(buffer))
+ return PTR_ERR(buffer);
+
+ retval = simple_read_from_buffer(userbuf, nbytes, ppos, buffer, len);
+ kfree(buffer);
+ return retval;
+}
+
+static inline short convert_access(char *acc)
+{
+ short access = 0;
+
+ while (*acc) {
+ switch (*acc) {
+ case 'r':
+ case 'R': access |= ACC_READ; break;
+ case 'w':
+ case 'W': access |= ACC_WRITE; break;
+ case 'm':
+ case 'M': access |= ACC_MKNOD; break;
+ case '\n': break;
+ default:
+ return -EINVAL;
+ }
+ acc++;
+ }
+
+ return access;
+}
+
+static inline short convert_type(char intype)
+{
+ short type = 0;
+ switch (intype) {
+ case 'a': type = DEV_ALL; break;
+ case 'c': type = DEV_CHAR; break;
+ case 'b': type = DEV_BLOCK; break;
+ default: type = -EACCES; break;
+ }
+ return type;
+}
+
+static int convert_majmin(char *m, unsigned *u)
+{
+ if (m[0] == '*') {
+ *u = ~0;
+ return 0;
+ }
+ if (sscanf(m, "%u", u) != 1)
+ return -EINVAL;
+ return 0;
+}
+
+static ssize_t devcg_access_write(struct cgroup *cgroup, struct cftype *cft,
+ struct file *file, const char __user *userbuf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct cgroup *cur_cgroup;
+ struct dev_cgroup *devcgrp, *cur_devcgroup;
+ int filetype = cft->private;
+ char *buffer, acc[4], maj[10], min[10];
+ int retval = 0;
+ int nitems;
+ char type;
+ struct dev_whitelist_item wh;
+
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_NS_OVERRIDE))
+ return -EPERM;
+
+ devcgrp = cgroup_to_devcg(cgroup);
+ cur_cgroup = task_cgroup(current, devcg_subsys.subsys_id);
+ cur_devcgroup = cgroup_to_devcg(cur_cgroup);
+
+ buffer = kmalloc(nbytes+1, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ if (copy_from_user(buffer, userbuf, nbytes)) {
+ retval = -EFAULT;
+ goto out1;
+ }
+ buffer[nbytes] = 0; /* nul-terminate */
+
+ cgroup_lock();
+ if (cgroup_is_removed(cgroup)) {
+ retval = -ENODEV;
+ goto out2;
+ }
+
+ memset(&wh, 0, sizeof(wh));
+ memset(acc, 0, 4);
+ nitems = sscanf(buffer, "%c %9s %9s %3s", &type, maj, min,
+ acc);
+ retval = -EINVAL;
+ if (nitems != 4)
+ goto out2;
+ wh.type = convert_type(type);
+ if (wh.type < 0)
+ goto out2;
+ wh.access = convert_access(acc);
+ if (convert_majmin(maj, &wh.major))
+ goto out2;
+ if (convert_majmin(min, &wh.minor))
+ goto out2;
+ if (wh.access < 0)
+ goto out2;
+ retval = 0;
+ switch (filetype) {
+ case DEVCG_ALLOW:
+ retval = dev_whitelist_add(devcgrp, &wh);
+ break;
+ case DEVCG_DENY:
+ dev_whitelist_rm(devcgrp, &wh);
+ break;
+ default:
+ retval = -EINVAL;
+ goto out2;
+ }
+
+ if (retval == 0)
+ retval = nbytes;
+
+out2:
+ cgroup_unlock();
+out1:
+ kfree(buffer);
+ return retval;
+}
+
+static struct cftype dev_cgroup_files[] = {
+ {
+ .name = "allow",
+ .read = devcg_access_read,
+ .write = devcg_access_write,
+ .private = DEVCG_ALLOW,
+ },
+ {
+ .name = "deny",
+ .write = devcg_access_write,
+ .private = DEVCG_DENY,
+ },
+};
+
+static int devcg_populate(struct cgroup_subsys *ss,
+ struct cgroup *cont)
+{
+ return cgroup_add_files(cont, ss, dev_cgroup_files,
+ ARRAY_SIZE(dev_cgroup_files));
+}
+
+struct cgroup_subsys devcg_subsys = {
+ .name = "devcg",
+ .can_attach = devcg_can_attach,
+ .create = devcg_create,
+ .destroy = devcg_destroy,
+ .populate = devcg_populate,
+ .subsys_id = devcg_subsys_id,
+};
diff --git a/security/Kconfig b/security/Kconfig
index 5dfc206..c7960c0 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -81,9 +81,13 @@ config SECURITY_CAPABILITIES
This enables the "default" Linux capabilities functionality.
If you are unsure how to answer this question, answer Y.

+config COMMONCAP
+ bool
+ default !SECURITY || SECURITY_CAPABILITIES || SECURITY_ROOTPLUG || SECURITY_SMACK || CGROUP_DEV
+
config SECURITY_FILE_CAPABILITIES
bool "File POSIX Capabilities (EXPERIMENTAL)"
- depends on (SECURITY=n || SECURITY_CAPABILITIES!=n) && EXPERIMENTAL
+ depends on COMMONCAP && EXPERIMENTAL
default n
help
This enables filesystem capabilities, allowing you to give
diff --git a/security/Makefile b/security/Makefile
index 9e8b025..6093003 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -6,15 +6,13 @@ obj-$(CONFIG_KEYS) += keys/
subdir-$(CONFIG_SECURITY_SELINUX) += selinux
subdir-$(CONFIG_SECURITY_SMACK) += smack

-# if we don't select a security model, use the default capabilities
-ifneq ($(CONFIG_SECURITY),y)
-obj-y += commoncap.o
-endif
+obj-$(CONFIG_COMMONCAP) += commoncap.o

# Object file lists
obj-$(CONFIG_SECURITY) += security.o dummy.o inode.o
# Must precede capability.o in order to stack properly.
obj-$(CONFIG_SECURITY_SELINUX) += selinux/built-in.o
-obj-$(CONFIG_SECURITY_SMACK) += commoncap.o smack/built-in.o
-obj-$(CONFIG_SECURITY_CAPABILITIES) += commoncap.o capability.o
-obj-$(CONFIG_SECURITY_ROOTPLUG) += commoncap.o root_plug.o
+obj-$(CONFIG_SECURITY_SMACK) += smack/built-in.o
+obj-$(CONFIG_SECURITY_CAPABILITIES) += capability.o
+obj-$(CONFIG_SECURITY_ROOTPLUG) += root_plug.o
+obj-$(CONFIG_CGROUP_DEV) += dev_cgroup.o
diff --git a/security/capability.c b/security/capability.c
index 8340655..1202991 100644
--- a/security/capability.c
+++ b/security/capability.c
@@ -39,6 +39,8 @@ static struct security_operations capability_ops = {
.inode_removexattr = cap_inode_removexattr,
.inode_need_killpriv = cap_inode_need_killpriv,
.inode_killpriv = cap_inode_killpriv,
+ .inode_permission = cap_inode_permission,
+ .inode_mknod = cap_inode_mknod,

.task_kill = cap_task_kill,
.task_setscheduler = cap_task_setscheduler,
diff --git a/security/commoncap.c b/security/commoncap.c
index 83f2691..68c6a97 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -26,6 +26,7 @@
#include <linux/sched.h>
#include <linux/prctl.h>
#include <linux/securebits.h>
+#include <linux/devcg.h>

int cap_netlink_send(struct sock *sk, struct sk_buff *skb)
{
@@ -160,6 +161,18 @@ static inline void bprm_clear_caps(struct linux_binprm *bprm)
bprm->cap_effective = false;
}

+int cap_inode_permission(struct inode *inode, int mask,
+ struct nameidata *nd)
+{
+ return devcgroup_inode_permission(inode, mask, nd);
+}
+
+int cap_inode_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t dev)
+{
+ return devcgroup_inode_mknod(dir, dentry, mode, dev);
+}
+
#ifdef CONFIG_SECURITY_FILE_CAPABILITIES

int cap_inode_need_killpriv(struct dentry *dentry)
diff --git a/security/dev_cgroup.c b/security/dev_cgroup.c
new file mode 100644
index 0000000..eb65411
--- /dev/null
+++ b/security/dev_cgroup.c
@@ -0,0 +1,83 @@
+/*
+ * LSM portion of the device cgroup subsystem.
+ *
+ * Copyright 2007 IBM Corp
+ */
+
+#include <linux/devcg.h>
+
+int devcgroup_inode_permission(struct inode *inode, int mask,
+ struct nameidata *nd)
+{
+ struct cgroup *cgroup;
+ struct dev_cgroup *dev_cgroup;
+ struct dev_whitelist_item *wh;
+
+ dev_t device = inode->i_rdev;
+ if (!device)
+ return 0;
+ if (!S_ISBLK(inode->i_mode) && !S_ISCHR(inode->i_mode))
+ return 0;
+ cgroup = task_cgroup(current, devcg_subsys.subsys_id);
+ dev_cgroup = cgroup_to_devcg(cgroup);
+ if (!dev_cgroup)
+ return 0;
+
+ spin_lock(&dev_cgroup->lock);
+ list_for_each_entry(wh, &dev_cgroup->whitelist, list) {
+ if (wh->type & DEV_ALL)
+ goto acc_check;
+ if ((wh->type & DEV_BLOCK) && !S_ISBLK(inode->i_mode))
+ continue;
+ if ((wh->type & DEV_CHAR) && !S_ISCHR(inode->i_mode))
+ continue;
+ if (wh->major != ~0 && wh->major != imajor(inode))
+ continue;
+ if (wh->minor != ~0 && wh->minor != iminor(inode))
+ continue;
+acc_check:
+ if ((mask & MAY_WRITE) && !(wh->access & ACC_WRITE))
+ continue;
+ if ((mask & MAY_READ) && !(wh->access & ACC_READ))
+ continue;
+ spin_unlock(&dev_cgroup->lock);
+ return 0;
+ }
+ spin_unlock(&dev_cgroup->lock);
+
+ return -EPERM;
+}
+
+int devcgroup_inode_mknod(struct inode *dir, struct dentry *dentry,
+ int mode, dev_t dev)
+{
+ struct cgroup *cgroup;
+ struct dev_cgroup *dev_cgroup;
+ struct dev_whitelist_item *wh;
+
+ cgroup = task_cgroup(current, devcg_subsys.subsys_id);
+ dev_cgroup = cgroup_to_devcg(cgroup);
+ if (!dev_cgroup)
+ return 0;
+
+ spin_lock(&dev_cgroup->lock);
+ list_for_each_entry(wh, &dev_cgroup->whitelist, list) {
+ if (wh->type & DEV_ALL)
+ goto acc_check;
+ if ((wh->type & DEV_BLOCK) && !S_ISBLK(mode))
+ continue;
+ if ((wh->type & DEV_CHAR) && !S_ISCHR(mode))
+ continue;
+ if (wh->major != ~0 && wh->major != MAJOR(dev))
+ continue;
+ if (wh->minor != ~0 && wh->minor != MINOR(dev))
+ continue;
+acc_check:
+ if (!(wh->access & ACC_MKNOD))
+ continue;
+ spin_unlock(&dev_cgroup->lock);
+ return 0;
+ }
+ spin_unlock(&dev_cgroup->lock);
+ return -EPERM;
+}
diff --git a/security/root_plug.c b/security/root_plug.c
index a41cf42..090015d 100644
--- a/security/root_plug.c
+++ b/security/root_plug.c
@@ -80,6 +80,8 @@ static struct security_operations rootplug_security_ops = {
.capset_check = cap_capset_check,
.capset_set = cap_capset_set,
.capable = cap_capable,
+ .inode_mknod = cap_inode_mknod,
+ .inode_permission = cap_inode_permission,

.bprm_apply_creds = cap_bprm_apply_creds,
.bprm_set_security = cap_bprm_set_security,
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 20ec35c..6814aaa 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -523,6 +523,10 @@ static int smack_inode_rename(struct inode *old_inode,
static int smack_inode_permission(struct inode *inode, int mask,
struct nameidata *nd)
{
+ int err;
+ err = cap_inode_permission(inode, mask, nd);
+ if (err)
+ return err;
/*
* No permission to check. Existence test. Yup, it's there.
*/
@@ -2460,6 +2464,7 @@ struct security_operations smack_ops = {
.inode_getsecurity = smack_inode_getsecurity,
.inode_setsecurity = smack_inode_setsecurity,
.inode_listsecurity = smack_inode_listsecurity,
+ .inode_mknod = cap_inode_mknod,

.file_permission = smack_file_permission,
.file_alloc_security = smack_file_alloc_security,
--
1.5.1