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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/security/inode.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/security/inode.c')
-rw-r--r-- | kernel/security/inode.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/kernel/security/inode.c b/kernel/security/inode.c new file mode 100644 index 000000000..0e37e4fba --- /dev/null +++ b/kernel/security/inode.c @@ -0,0 +1,234 @@ +/* + * 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/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> +#include <linux/magic.h> + +static struct vfsmount *mount; +static int mount_count; + +static inline int positive(struct dentry *dentry) +{ + return d_really_is_positive(dentry) && !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 dentry *get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) +{ + return mount_single(fs_type, flags, data, fill_super); +} + +static struct file_system_type fs_type = { + .owner = THIS_MODULE, + .name = "securityfs", + .mount = get_sb, + .kill_sb = kill_litter_super, +}; + +/** + * 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 parameter 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.i_private 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 creating 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 returns 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, the function will return + * the error value (via ERR_PTR). + * + * If securityfs is not enabled in the kernel, the value %-ENODEV is + * returned. + */ +struct dentry *securityfs_create_file(const char *name, umode_t mode, + struct dentry *parent, void *data, + const struct file_operations *fops) +{ + struct dentry *dentry; + int is_dir = S_ISDIR(mode); + struct inode *dir, *inode; + int error; + + if (!is_dir) { + BUG_ON(!fops); + mode = (mode & S_IALLUGO) | S_IFREG; + } + + pr_debug("securityfs: creating file '%s'\n",name); + + error = simple_pin_fs(&fs_type, &mount, &mount_count); + if (error) + return ERR_PTR(error); + + if (!parent) + parent = mount->mnt_root; + + dir = d_inode(parent); + + mutex_lock(&dir->i_mutex); + dentry = lookup_one_len(name, parent, strlen(name)); + if (IS_ERR(dentry)) + goto out; + + if (d_really_is_positive(dentry)) { + error = -EEXIST; + goto out1; + } + + inode = new_inode(dir->i_sb); + if (!inode) { + error = -ENOMEM; + goto out1; + } + + inode->i_ino = get_next_ino(); + inode->i_mode = mode; + inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_private = data; + if (is_dir) { + inode->i_op = &simple_dir_inode_operations; + inode->i_fop = &simple_dir_operations; + inc_nlink(inode); + inc_nlink(dir); + } else { + inode->i_fop = fops; + } + d_instantiate(dentry, inode); + dget(dentry); + mutex_unlock(&dir->i_mutex); + return dentry; + +out1: + dput(dentry); + dentry = ERR_PTR(error); +out: + mutex_unlock(&dir->i_mutex); + simple_release_fs(&mount, &mount_count); + 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 parameter 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 returns 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 is + * 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 || IS_ERR(dentry)) + return; + + parent = dentry->d_parent; + if (!parent || d_really_is_negative(parent)) + return; + + mutex_lock(&d_inode(parent)->i_mutex); + if (positive(dentry)) { + if (d_really_is_positive(dentry)) { + if (d_is_dir(dentry)) + simple_rmdir(d_inode(parent), dentry); + else + simple_unlink(d_inode(parent), dentry); + dput(dentry); + } + } + mutex_unlock(&d_inode(parent)->i_mutex); + simple_release_fs(&mount, &mount_count); +} +EXPORT_SYMBOL_GPL(securityfs_remove); + +static int __init securityfs_init(void) +{ + int retval; + + retval = sysfs_create_mount_point(kernel_kobj, "security"); + if (retval) + return retval; + + retval = register_filesystem(&fs_type); + if (retval) + sysfs_remove_mount_point(kernel_kobj, "security"); + return retval; +} + +core_initcall(securityfs_init); +MODULE_LICENSE("GPL"); + |