[PATCH] add securityfs for all LSMs to use

Here's a small patch against 2.6.13-rc2 that adds securityfs, a virtual
fs that all LSMs can use instead of creating their own.  The fs should
be mounted at /sys/kernel/security, and the fs creates that mount point.
This will make the LSB people happy that we aren't creating a new
/my_lsm_fs directory in the root for every different LSM.

It has changed a bit since the last version, thanks to comments from
Mike Waychison.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Chris Wright <chrisw@osdl.org>

2 files changed, 348 insertions, 1 deletions

diff --git a/security/Makefile b/security/Makefile
index 197cc2f3f1ec..8cbbf2f36709 100644
--- a/security/Makefile
+++ b/security/Makefile
@@ -11,7 +11,7 @@ obj-y		+= commoncap.o
 endif
 
 # Object file lists
-obj-$(CONFIG_SECURITY)                  += security.o dummy.o
+obj-$(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_CAPABILITIES)     += commoncap.o capability.o
diff --git a/security/inode.c b/security/inode.c
new file mode 100644
index 000000000000..a5964502ae30
--- /dev/null
+++ b/security/inode.c
@@ -0,0 +1,347 @@
+/*
+ *  inode.c - securityfs
+ *
+ *  Copyright (C) 2005 Greg Kroah-Hartman <gregkh@suse.de>
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License version
+ *      2 as published by the Free Software Foundation.
+ *
+ *  Based on fs/debugfs/inode.c which had the following copyright notice:
+ *    Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *    Copyright (C) 2004 IBM Inc.
+ */
+
+/* #define DEBUG */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+
+#define SECURITYFS_MAGIC        0x73636673
+
+static struct vfsmount *mount;
+static int mount_count;
+
+/*
+ * TODO:
+ *   I think I can get rid of these default_file_ops, but not quite sure...
+ */
+static ssize_t default_read_file(struct file *file, char __user *buf,
+                                 size_t count, loff_t *ppos)
+{
+        return 0;
+}
+
+static ssize_t default_write_file(struct file *file, const char __user *buf,
+                                   size_t count, loff_t *ppos)
+{
+        return count;
+}
+
+static int default_open(struct inode *inode, struct file *file)
+{
+        if (inode->u.generic_ip)
+                file->private_data = inode->u.generic_ip;
+
+        return 0;
+}
+
+static struct file_operations default_file_ops = {
+        .read =         default_read_file,
+        .write =        default_write_file,
+        .open =         default_open,
+};
+
+static struct inode *get_inode(struct super_block *sb, int mode, dev_t dev)
+{
+        struct inode *inode = new_inode(sb);
+
+        if (inode) {
+                inode->i_mode = mode;
+                inode->i_uid = 0;
+                inode->i_gid = 0;
+                inode->i_blksize = PAGE_CACHE_SIZE;
+                inode->i_blocks = 0;
+                inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+                switch (mode & S_IFMT) {
+                default:
+                        init_special_inode(inode, mode, dev);
+                        break;
+                case S_IFREG:
+                        inode->i_fop = &default_file_ops;
+                        break;
+                case S_IFDIR:
+                        inode->i_op = &simple_dir_inode_operations;
+                        inode->i_fop = &simple_dir_operations;
+
+                        /* directory inodes start off with i_nlink == 2 (for "." entry) */
+                        inode->i_nlink++;
+                        break;
+                }
+        }
+        return inode;
+}
+
+/* SMP-safe */
+static int mknod(struct inode *dir, struct dentry *dentry,
+                         int mode, dev_t dev)
+{
+        struct inode *inode;
+        int error = -EPERM;
+
+        if (dentry->d_inode)
+                return -EEXIST;
+
+        inode = get_inode(dir->i_sb, mode, dev);
+        if (inode) {
+                d_instantiate(dentry, inode);
+                dget(dentry);
+                error = 0;
+        }
+        return error;
+}
+
+static int mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+        int res;
+
+        mode = (mode & (S_IRWXUGO | S_ISVTX)) | S_IFDIR;
+        res = mknod(dir, dentry, mode, 0);
+        if (!res)
+                dir->i_nlink++;
+        return res;
+}
+
+static int create(struct inode *dir, struct dentry *dentry, int mode)
+{
+        mode = (mode & S_IALLUGO) | S_IFREG;
+        return mknod(dir, dentry, mode, 0);
+}
+
+static inline int positive(struct dentry *dentry)
+{
+        return dentry->d_inode && !d_unhashed(dentry);
+}
+
+static int fill_super(struct super_block *sb, void *data, int silent)
+{
+        static struct tree_descr files[] = {{""}};
+
+        return simple_fill_super(sb, SECURITYFS_MAGIC, files);
+}
+
+static struct super_block *get_sb(struct file_system_type *fs_type,
+                                        int flags, const char *dev_name,
+                                        void *data)
+{
+        return get_sb_single(fs_type, flags, data, fill_super);
+}
+
+static struct file_system_type fs_type = {
+        .owner =        THIS_MODULE,
+        .name =         "securityfs",
+        .get_sb =       get_sb,
+        .kill_sb =      kill_litter_super,
+};
+
+static int create_by_name(const char *name, mode_t mode,
+                          struct dentry *parent,
+                          struct dentry **dentry)
+{
+        int error = 0;
+
+        *dentry = NULL;
+
+        /* If the parent is not specified, we create it in the root.
+         * We need the root dentry to do this, which is in the super
+         * block. A pointer to that is in the struct vfsmount that we
+         * have around.
+         */
+        if (!parent ) {
+                if (mount && mount->mnt_sb) {
+                        parent = mount->mnt_sb->s_root;
+                }
+        }
+        if (!parent) {
+                pr_debug("securityfs: Ah! can not find a parent!\n");
+                return -EFAULT;
+        }
+
+        down(&parent->d_inode->i_sem);
+        *dentry = lookup_one_len(name, parent, strlen(name));
+        if (!IS_ERR(dentry)) {
+                if ((mode & S_IFMT) == S_IFDIR)
+                        error = mkdir(parent->d_inode, *dentry, mode);
+                else
+                        error = create(parent->d_inode, *dentry, mode);
+        } else
+                error = PTR_ERR(dentry);
+        up(&parent->d_inode->i_sem);
+
+        return error;
+}
+
+/**
+ * securityfs_create_file - create a file in the securityfs filesystem
+ *
+ * @name: a pointer to a string containing the name of the file to create.
+ * @mode: the permission that the file should have
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          file will be created in the root of the securityfs filesystem.
+ * @data: a pointer to something that the caller will want to get to later
+ *        on.  The inode.u.generic_ip pointer will point to this value on
+ *        the open() call.
+ * @fops: a pointer to a struct file_operations that should be used for
+ *        this file.
+ *
+ * This is the basic "create a file" function for securityfs.  It allows for a
+ * wide range of flexibility in createing a file, or a directory (if you
+ * want to create a directory, the securityfs_create_dir() function is
+ * recommended to be used instead.)
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the securityfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If securityfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *securityfs_create_file(const char *name, mode_t mode,
+                                   struct dentry *parent, void *data,
+                                   struct file_operations *fops)
+{
+        struct dentry *dentry = NULL;
+        int error;
+
+        pr_debug("securityfs: creating file '%s'\n",name);
+
+        error = simple_pin_fs("securityfs", &mount, &mount_count);
+        if (error) {
+                dentry = ERR_PTR(error);
+                goto exit;
+        }
+
+        error = create_by_name(name, mode, parent, &dentry);
+        if (error) {
+                dentry = ERR_PTR(error);
+                simple_release_fs(&mount, &mount_count);
+                goto exit;
+        }
+
+        if (dentry->d_inode) {
+                if (fops)
+                        dentry->d_inode->i_fop = fops;
+                if (data)
+                        dentry->d_inode->u.generic_ip = data;
+        }
+exit:
+        return dentry;
+}
+EXPORT_SYMBOL_GPL(securityfs_create_file);
+
+/**
+ * securityfs_create_dir - create a directory in the securityfs filesystem
+ *
+ * @name: a pointer to a string containing the name of the directory to
+ *        create.
+ * @parent: a pointer to the parent dentry for this file.  This should be a
+ *          directory dentry if set.  If this paramater is NULL, then the
+ *          directory will be created in the root of the securityfs filesystem.
+ *
+ * This function creates a directory in securityfs with the given name.
+ *
+ * This function will return a pointer to a dentry if it succeeds.  This
+ * pointer must be passed to the securityfs_remove() function when the file is
+ * to be removed (no automatic cleanup happens if your module is unloaded,
+ * you are responsible here.)  If an error occurs, NULL will be returned.
+ *
+ * If securityfs is not enabled in the kernel, the value -ENODEV will be
+ * returned.  It is not wise to check for this value, but rather, check for
+ * NULL or !NULL instead as to eliminate the need for #ifdef in the calling
+ * code.
+ */
+struct dentry *securityfs_create_dir(const char *name, struct dentry *parent)
+{
+        return securityfs_create_file(name,
+                                      S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
+                                      parent, NULL, NULL);
+}
+EXPORT_SYMBOL_GPL(securityfs_create_dir);
+
+/**
+ * securityfs_remove - removes a file or directory from the securityfs filesystem
+ *
+ * @dentry: a pointer to a the dentry of the file or directory to be
+ *          removed.
+ *
+ * This function removes a file or directory in securityfs that was previously
+ * created with a call to another securityfs function (like
+ * securityfs_create_file() or variants thereof.)
+ *
+ * This function is required to be called in order for the file to be
+ * removed, no automatic cleanup of files will happen when a module is
+ * removed, you are responsible here.
+ */
+void securityfs_remove(struct dentry *dentry)
+{
+        struct dentry *parent;
+
+        if (!dentry)
+                return;
+
+        parent = dentry->d_parent;
+        if (!parent || !parent->d_inode)
+                return;
+
+        down(&parent->d_inode->i_sem);
+        if (positive(dentry)) {
+                if (dentry->d_inode) {
+                        if (S_ISDIR(dentry->d_inode->i_mode))
+                                simple_rmdir(parent->d_inode, dentry);
+                        else
+                                simple_unlink(parent->d_inode, dentry);
+                        dput(dentry);
+                }
+        }
+        up(&parent->d_inode->i_sem);
+        simple_release_fs(&mount, &mount_count);
+}
+EXPORT_SYMBOL_GPL(securityfs_remove);
+
+static decl_subsys(security, NULL, NULL);
+
+static int __init securityfs_init(void)
+{
+        int retval;
+
+        kset_set_kset_s(&security_subsys, kernel_subsys);
+        retval = subsystem_register(&security_subsys);
+        if (retval)
+                return retval;
+
+        retval = register_filesystem(&fs_type);
+        if (retval)
+                subsystem_unregister(&security_subsys);
+        return retval;
+}
+
+static void __exit securityfs_exit(void)
+{
+        simple_release_fs(&mount, &mount_count);
+        unregister_filesystem(&fs_type);
+        subsystem_unregister(&security_subsys);
+}
+
+core_initcall(securityfs_init);
+module_exit(securityfs_exit);
+MODULE_LICENSE("GPL");
+