[GitHub/mt8127/android_kernel_alcatel_ttab.git] / security / tomoyo / tomoyo.c

/*
 * security/tomoyo/tomoyo.c
 *
 * Copyright (C) 2005-2011  NTT DATA CORPORATION
 */

#include <linux/security.h>
#include "common.h"

/**
 * tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
 *
 * @new: Pointer to "struct cred".
 * @gfp: Memory allocation flags.
 *
 * Returns 0.
 */
static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
{
	new->security = NULL;
	return 0;
}

/**
 * tomoyo_cred_prepare - Target for security_prepare_creds().
 *
 * @new: Pointer to "struct cred".
 * @old: Pointer to "struct cred".
 * @gfp: Memory allocation flags.
 *
 * Returns 0.
 */
static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
			       gfp_t gfp)
{
	struct tomoyo_domain_info *domain = old->security;
	new->security = domain;
	if (domain)
		atomic_inc(&domain->users);
	return 0;
}

/**
 * tomoyo_cred_transfer - Target for security_transfer_creds().
 *
 * @new: Pointer to "struct cred".
 * @old: Pointer to "struct cred".
 */
static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
{
	tomoyo_cred_prepare(new, old, 0);
}

/**
 * tomoyo_cred_free - Target for security_cred_free().
 *
 * @cred: Pointer to "struct cred".
 */
static void tomoyo_cred_free(struct cred *cred)
{
	struct tomoyo_domain_info *domain = cred->security;
	if (domain)
		atomic_dec(&domain->users);
}

/**
 * tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
 *
 * @bprm: Pointer to "struct linux_binprm".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
{
	int rc;

	rc = cap_bprm_set_creds(bprm);
	if (rc)
		return rc;

	/*
	 * Do only if this function is called for the first time of an execve
	 * operation.
	 */
	if (bprm->cred_prepared)
		return 0;
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
	/*
	 * Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
	 * for the first time.
	 */
	if (!tomoyo_policy_loaded)
		tomoyo_load_policy(bprm->filename);
#endif
	/*
	 * Release reference to "struct tomoyo_domain_info" stored inside
	 * "bprm->cred->security". New reference to "struct tomoyo_domain_info"
	 * stored inside "bprm->cred->security" will be acquired later inside
	 * tomoyo_find_next_domain().
	 */
	atomic_dec(&((struct tomoyo_domain_info *)
		     bprm->cred->security)->users);
	/*
	 * Tell tomoyo_bprm_check_security() is called for the first time of an
	 * execve operation.
	 */
	bprm->cred->security = NULL;
	return 0;
}

/**
 * tomoyo_bprm_check_security - Target for security_bprm_check().
 *
 * @bprm: Pointer to "struct linux_binprm".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
{
	struct tomoyo_domain_info *domain = bprm->cred->security;

	/*
	 * Execute permission is checked against pathname passed to do_execve()
	 * using current domain.
	 */
	if (!domain) {
		const int idx = tomoyo_read_lock();
		const int err = tomoyo_find_next_domain(bprm);
		tomoyo_read_unlock(idx);
		return err;
	}
	/*
	 * Read permission is checked against interpreters using next domain.
	 */
	return tomoyo_check_open_permission(domain, &bprm->file->f_path,
					    O_RDONLY);
}

/**
 * tomoyo_inode_getattr - Target for security_inode_getattr().
 *
 * @mnt:    Pointer to "struct vfsmount".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{
	struct path path = { mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
}

/**
 * tomoyo_path_truncate - Target for security_path_truncate().
 *
 * @path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_truncate(struct path *path)
{
	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
}

/**
 * tomoyo_path_unlink - Target for security_path_unlink().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_unlink(struct path *parent, struct dentry *dentry)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
}

/**
 * tomoyo_path_mkdir - Target for security_path_mkdir().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 * @mode:   DAC permission mode.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_mkdir(struct path *parent, struct dentry *dentry,
			     int mode)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
				       mode & S_IALLUGO);
}

/**
 * tomoyo_path_rmdir - Target for security_path_rmdir().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_rmdir(struct path *parent, struct dentry *dentry)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
}

/**
 * tomoyo_path_symlink - Target for security_path_symlink().
 *
 * @parent:   Pointer to "struct path".
 * @dentry:   Pointer to "struct dentry".
 * @old_name: Symlink's content.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_symlink(struct path *parent, struct dentry *dentry,
			       const char *old_name)
{
	struct path path = { parent->mnt, dentry };
	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
}

/**
 * tomoyo_path_mknod - Target for security_path_mknod().
 *
 * @parent: Pointer to "struct path".
 * @dentry: Pointer to "struct dentry".
 * @mode:   DAC permission mode.
 * @dev:    Device attributes.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_mknod(struct path *parent, struct dentry *dentry,
			     int mode, unsigned int dev)
{
	struct path path = { parent->mnt, dentry };
	int type = TOMOYO_TYPE_CREATE;
	const unsigned int perm = mode & S_IALLUGO;

	switch (mode & S_IFMT) {
	case S_IFCHR:
		type = TOMOYO_TYPE_MKCHAR;
		break;
	case S_IFBLK:
		type = TOMOYO_TYPE_MKBLOCK;
		break;
	default:
		goto no_dev;
	}
	return tomoyo_mkdev_perm(type, &path, perm, dev);
 no_dev:
	switch (mode & S_IFMT) {
	case S_IFIFO:
		type = TOMOYO_TYPE_MKFIFO;
		break;
	case S_IFSOCK:
		type = TOMOYO_TYPE_MKSOCK;
		break;
	}
	return tomoyo_path_number_perm(type, &path, perm);
}

/**
 * tomoyo_path_link - Target for security_path_link().
 *
 * @old_dentry: Pointer to "struct dentry".
 * @new_dir:    Pointer to "struct path".
 * @new_dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_link(struct dentry *old_dentry, struct path *new_dir,
			    struct dentry *new_dentry)
{
	struct path path1 = { new_dir->mnt, old_dentry };
	struct path path2 = { new_dir->mnt, new_dentry };
	return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
}

/**
 * tomoyo_path_rename - Target for security_path_rename().
 *
 * @old_parent: Pointer to "struct path".
 * @old_dentry: Pointer to "struct dentry".
 * @new_parent: Pointer to "struct path".
 * @new_dentry: Pointer to "struct dentry".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_rename(struct path *old_parent,
			      struct dentry *old_dentry,
			      struct path *new_parent,
			      struct dentry *new_dentry)
{
	struct path path1 = { old_parent->mnt, old_dentry };
	struct path path2 = { new_parent->mnt, new_dentry };
	return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
}

/**
 * tomoyo_file_fcntl - Target for security_file_fcntl().
 *
 * @file: Pointer to "struct file".
 * @cmd:  Command for fcntl().
 * @arg:  Argument for @cmd.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
		return 0;
	return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
					    O_WRONLY | (arg & O_APPEND));
}

/**
 * tomoyo_dentry_open - Target for security_dentry_open().
 *
 * @f:    Pointer to "struct file".
 * @cred: Pointer to "struct cred".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_dentry_open(struct file *f, const struct cred *cred)
{
	int flags = f->f_flags;
	/* Don't check read permission here if called from do_execve(). */
	if (current->in_execve)
		return 0;
	return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
}

/**
 * tomoyo_file_ioctl - Target for security_file_ioctl().
 *
 * @file: Pointer to "struct file".
 * @cmd:  Command for ioctl().
 * @arg:  Argument for @cmd.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
			     unsigned long arg)
{
	return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
}

/**
 * tomoyo_path_chmod - Target for security_path_chmod().
 *
 * @dentry: Pointer to "struct dentry".
 * @mnt:    Pointer to "struct vfsmount".
 * @mode:   DAC permission mode.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chmod(struct dentry *dentry, struct vfsmount *mnt,
			     mode_t mode)
{
	struct path path = { mnt, dentry };
	return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, &path,
				       mode & S_IALLUGO);
}

/**
 * tomoyo_path_chown - Target for security_path_chown().
 *
 * @path: Pointer to "struct path".
 * @uid:  Owner ID.
 * @gid:  Group ID.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
{
	int error = 0;
	if (uid != (uid_t) -1)
		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
	if (!error && gid != (gid_t) -1)
		error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
	return error;
}

/**
 * tomoyo_path_chroot - Target for security_path_chroot().
 *
 * @path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_path_chroot(struct path *path)
{
	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
}

/**
 * tomoyo_sb_mount - Target for security_sb_mount().
 *
 * @dev_name: Name of device file. Maybe NULL.
 * @path:     Pointer to "struct path".
 * @type:     Name of filesystem type. Maybe NULL.
 * @flags:    Mount options.
 * @data:     Optional data. Maybe NULL.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_mount(char *dev_name, struct path *path,
			   char *type, unsigned long flags, void *data)
{
	return tomoyo_mount_permission(dev_name, path, type, flags, data);
}

/**
 * tomoyo_sb_umount - Target for security_sb_umount().
 *
 * @mnt:   Pointer to "struct vfsmount".
 * @flags: Unmount options.
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
{
	struct path path = { mnt, mnt->mnt_root };
	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
}

/**
 * tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
 *
 * @old_path: Pointer to "struct path".
 * @new_path: Pointer to "struct path".
 *
 * Returns 0 on success, negative value otherwise.
 */
static int tomoyo_sb_pivotroot(struct path *old_path, struct path *new_path)
{
	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
}

/*
 * tomoyo_security_ops is a "struct security_operations" which is used for
 * registering TOMOYO.
 */
static struct security_operations tomoyo_security_ops = {
	.name                = "tomoyo",
	.cred_alloc_blank    = tomoyo_cred_alloc_blank,
	.cred_prepare        = tomoyo_cred_prepare,
	.cred_transfer	     = tomoyo_cred_transfer,
	.cred_free           = tomoyo_cred_free,
	.bprm_set_creds      = tomoyo_bprm_set_creds,
	.bprm_check_security = tomoyo_bprm_check_security,
	.file_fcntl          = tomoyo_file_fcntl,
	.dentry_open         = tomoyo_dentry_open,
	.path_truncate       = tomoyo_path_truncate,
	.path_unlink         = tomoyo_path_unlink,
	.path_mkdir          = tomoyo_path_mkdir,
	.path_rmdir          = tomoyo_path_rmdir,
	.path_symlink        = tomoyo_path_symlink,
	.path_mknod          = tomoyo_path_mknod,
	.path_link           = tomoyo_path_link,
	.path_rename         = tomoyo_path_rename,
	.inode_getattr       = tomoyo_inode_getattr,
	.file_ioctl          = tomoyo_file_ioctl,
	.path_chmod          = tomoyo_path_chmod,
	.path_chown          = tomoyo_path_chown,
	.path_chroot         = tomoyo_path_chroot,
	.sb_mount            = tomoyo_sb_mount,
	.sb_umount           = tomoyo_sb_umount,
	.sb_pivotroot        = tomoyo_sb_pivotroot,
};

/* Lock for GC. */
struct srcu_struct tomoyo_ss;

/**
 * tomoyo_init - Register TOMOYO Linux as a LSM module.
 *
 * Returns 0.
 */
static int __init tomoyo_init(void)
{
	struct cred *cred = (struct cred *) current_cred();

	if (!security_module_enable(&tomoyo_security_ops))
		return 0;
	/* register ourselves with the security framework */
	if (register_security(&tomoyo_security_ops) ||
	    init_srcu_struct(&tomoyo_ss))
		panic("Failure registering TOMOYO Linux");
	printk(KERN_INFO "TOMOYO Linux initialized\n");
	cred->security = &tomoyo_kernel_domain;
	tomoyo_mm_init();
	return 0;
}

security_initcall(tomoyo_init);
Commit	Line	Data
f7433243 KT	1	/*
	2	* security/tomoyo/tomoyo.c
	3	*
0f2a55d5	4	* Copyright (C) 2005-2011 NTT DATA CORPORATION
f7433243 KT	5	*/
	6
	7	#include <linux/security.h>
	8	#include "common.h"
f7433243	9
0f2a55d5 TH	10	/**
	11	* tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
	12	*
	13	* @new: Pointer to "struct cred".
	14	* @gfp: Memory allocation flags.
	15	*
	16	* Returns 0.
	17	*/
ee18d64c DH	18	static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
	19	{
	20	new->security = NULL;
	21	return 0;
	22	}
	23
0f2a55d5 TH	24	/**
	25	* tomoyo_cred_prepare - Target for security_prepare_creds().
	26	*
	27	* @new: Pointer to "struct cred".
	28	* @old: Pointer to "struct cred".
	29	* @gfp: Memory allocation flags.
	30	*
	31	* Returns 0.
	32	*/
f7433243 KT	33	static int tomoyo_cred_prepare(struct cred new, const struct cred old,
	34	gfp_t gfp)
	35	{
ec8e6a4e TH	36	struct tomoyo_domain_info *domain = old->security;
	37	new->security = domain;
	38	if (domain)
	39	atomic_inc(&domain->users);
f7433243 KT	40	return 0;
	41	}
	42
0f2a55d5 TH	43	/**
	44	* tomoyo_cred_transfer - Target for security_transfer_creds().
	45	*
	46	* @new: Pointer to "struct cred".
	47	* @old: Pointer to "struct cred".
	48	*/
ee18d64c DH	49	static void tomoyo_cred_transfer(struct cred new, const struct cred old)
ee18d64c DH	50	{
ec8e6a4e TH	51	tomoyo_cred_prepare(new, old, 0);
	52	}
	53
0f2a55d5 TH	54	/**
	55	* tomoyo_cred_free - Target for security_cred_free().
	56	*
	57	* @cred: Pointer to "struct cred".
	58	*/
ec8e6a4e TH	59	static void tomoyo_cred_free(struct cred *cred)
	60	{
	61	struct tomoyo_domain_info *domain = cred->security;
	62	if (domain)
	63	atomic_dec(&domain->users);
ee18d64c DH	64	}
ee18d64c DH	65
0f2a55d5 TH	66	/**
	67	* tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
	68	*
	69	* @bprm: Pointer to "struct linux_binprm".
	70	*
	71	* Returns 0 on success, negative value otherwise.
	72	*/
f7433243 KT	73	static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
f7433243 KT	74	{
b1338d19 HRK	75	int rc;
	76
	77	rc = cap_bprm_set_creds(bprm);
	78	if (rc)
	79	return rc;
	80
f7433243 KT	81	/*
	82	* Do only if this function is called for the first time of an execve
	83	* operation.
	84	*/
	85	if (bprm->cred_prepared)
	86	return 0;
7986cf28	87	#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
f7433243 KT	88	/*
	89	* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
	90	* for the first time.
	91	*/
	92	if (!tomoyo_policy_loaded)
	93	tomoyo_load_policy(bprm->filename);
7986cf28	94	#endif
ec8e6a4e TH	95	/*
	96	* Release reference to "struct tomoyo_domain_info" stored inside
	97	* "bprm->cred->security". New reference to "struct tomoyo_domain_info"
	98	* stored inside "bprm->cred->security" will be acquired later inside
	99	* tomoyo_find_next_domain().
	100	*/
	101	atomic_dec(&((struct tomoyo_domain_info *)
	102	bprm->cred->security)->users);
f7433243 KT	103	/*
	104	* Tell tomoyo_bprm_check_security() is called for the first time of an
	105	* execve operation.
	106	*/
	107	bprm->cred->security = NULL;
	108	return 0;
	109	}
	110
0f2a55d5 TH	111	/**
	112	* tomoyo_bprm_check_security - Target for security_bprm_check().
	113	*
	114	* @bprm: Pointer to "struct linux_binprm".
	115	*
	116	* Returns 0 on success, negative value otherwise.
	117	*/
f7433243 KT	118	static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
	119	{
	120	struct tomoyo_domain_info *domain = bprm->cred->security;
	121
	122	/*
	123	* Execute permission is checked against pathname passed to do_execve()
	124	* using current domain.
	125	*/
fdb8ebb7	126	if (!domain) {
fdb8ebb7 TH	127	const int idx = tomoyo_read_lock();
	128	const int err = tomoyo_find_next_domain(bprm);
	129	tomoyo_read_unlock(idx);
	130	return err;
	131	}
f7433243 KT	132	/*
f7433243 KT	133	* Read permission is checked against interpreters using next domain.
f7433243	134	*/
0f2a55d5 TH	135	return tomoyo_check_open_permission(domain, &bprm->file->f_path,
0f2a55d5 TH	136	O_RDONLY);
f7433243 KT	137	}
f7433243 KT	138
0f2a55d5 TH	139	/**
	140	* tomoyo_inode_getattr - Target for security_inode_getattr().
	141	*
	142	* @mnt: Pointer to "struct vfsmount".
	143	* @dentry: Pointer to "struct dentry".
	144	*
	145	* Returns 0 on success, negative value otherwise.
	146	*/
7c75964f TH	147	static int tomoyo_inode_getattr(struct vfsmount mnt, struct dentry dentry)
	148	{
	149	struct path path = { mnt, dentry };
97fb35e4	150	return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, &path, NULL);
7c75964f TH	151	}
7c75964f TH	152
0f2a55d5 TH	153	/**
	154	* tomoyo_path_truncate - Target for security_path_truncate().
	155	*
	156	* @path: Pointer to "struct path".
	157	*
	158	* Returns 0 on success, negative value otherwise.
	159	*/
ea0d3ab2	160	static int tomoyo_path_truncate(struct path *path)
f7433243	161	{
97fb35e4	162	return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
f7433243 KT	163	}
f7433243 KT	164
0f2a55d5 TH	165	/**
	166	* tomoyo_path_unlink - Target for security_path_unlink().
	167	*
	168	* @parent: Pointer to "struct path".
	169	* @dentry: Pointer to "struct dentry".
	170	*
	171	* Returns 0 on success, negative value otherwise.
	172	*/
f7433243 KT	173	static int tomoyo_path_unlink(struct path parent, struct dentry dentry)
	174	{
	175	struct path path = { parent->mnt, dentry };
97fb35e4	176	return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
f7433243 KT	177	}
f7433243 KT	178
0f2a55d5 TH	179	/**
	180	* tomoyo_path_mkdir - Target for security_path_mkdir().
	181	*
	182	* @parent: Pointer to "struct path".
	183	* @dentry: Pointer to "struct dentry".
	184	* @mode: DAC permission mode.
	185	*
	186	* Returns 0 on success, negative value otherwise.
	187	*/
f7433243 KT	188	static int tomoyo_path_mkdir(struct path parent, struct dentry dentry,
	189	int mode)
	190	{
	191	struct path path = { parent->mnt, dentry };
a1f9bb6a TH	192	return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
a1f9bb6a TH	193	mode & S_IALLUGO);
f7433243 KT	194	}
f7433243 KT	195
0f2a55d5 TH	196	/**
	197	* tomoyo_path_rmdir - Target for security_path_rmdir().
	198	*
	199	* @parent: Pointer to "struct path".
	200	* @dentry: Pointer to "struct dentry".
	201	*
	202	* Returns 0 on success, negative value otherwise.
	203	*/
f7433243 KT	204	static int tomoyo_path_rmdir(struct path parent, struct dentry dentry)
	205	{
	206	struct path path = { parent->mnt, dentry };
97fb35e4	207	return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
f7433243 KT	208	}
f7433243 KT	209
0f2a55d5 TH	210	/**
	211	* tomoyo_path_symlink - Target for security_path_symlink().
	212	*
	213	* @parent: Pointer to "struct path".
	214	* @dentry: Pointer to "struct dentry".
	215	* @old_name: Symlink's content.
	216	*
	217	* Returns 0 on success, negative value otherwise.
	218	*/
f7433243 KT	219	static int tomoyo_path_symlink(struct path parent, struct dentry dentry,
	220	const char *old_name)
	221	{
	222	struct path path = { parent->mnt, dentry };
97fb35e4	223	return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
f7433243 KT	224	}
f7433243 KT	225
0f2a55d5 TH	226	/**
	227	* tomoyo_path_mknod - Target for security_path_mknod().
	228	*
	229	* @parent: Pointer to "struct path".
	230	* @dentry: Pointer to "struct dentry".
	231	* @mode: DAC permission mode.
	232	* @dev: Device attributes.
	233	*
	234	* Returns 0 on success, negative value otherwise.
	235	*/
f7433243 KT	236	static int tomoyo_path_mknod(struct path parent, struct dentry dentry,
	237	int mode, unsigned int dev)
	238	{
	239	struct path path = { parent->mnt, dentry };
7ef61233	240	int type = TOMOYO_TYPE_CREATE;
a1f9bb6a	241	const unsigned int perm = mode & S_IALLUGO;
f7433243 KT	242
	243	switch (mode & S_IFMT) {
	244	case S_IFCHR:
7ef61233	245	type = TOMOYO_TYPE_MKCHAR;
f7433243 KT	246	break;
f7433243 KT	247	case S_IFBLK:
7ef61233	248	type = TOMOYO_TYPE_MKBLOCK;
f7433243	249	break;
a1f9bb6a TH	250	default:
	251	goto no_dev;
	252	}
75093152	253	return tomoyo_mkdev_perm(type, &path, perm, dev);
a1f9bb6a TH	254	no_dev:
a1f9bb6a TH	255	switch (mode & S_IFMT) {
f7433243	256	case S_IFIFO:
7ef61233	257	type = TOMOYO_TYPE_MKFIFO;
f7433243 KT	258	break;
f7433243 KT	259	case S_IFSOCK:
7ef61233	260	type = TOMOYO_TYPE_MKSOCK;
f7433243 KT	261	break;
f7433243 KT	262	}
a1f9bb6a	263	return tomoyo_path_number_perm(type, &path, perm);
f7433243 KT	264	}
f7433243 KT	265
0f2a55d5 TH	266	/**
	267	* tomoyo_path_link - Target for security_path_link().
	268	*
	269	* @old_dentry: Pointer to "struct dentry".
	270	* @new_dir: Pointer to "struct path".
	271	* @new_dentry: Pointer to "struct dentry".
	272	*
	273	* Returns 0 on success, negative value otherwise.
	274	*/
f7433243 KT	275	static int tomoyo_path_link(struct dentry old_dentry, struct path new_dir,
	276	struct dentry *new_dentry)
	277	{
	278	struct path path1 = { new_dir->mnt, old_dentry };
	279	struct path path2 = { new_dir->mnt, new_dentry };
97d6931e	280	return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
f7433243 KT	281	}
f7433243 KT	282
0f2a55d5 TH	283	/**
	284	* tomoyo_path_rename - Target for security_path_rename().
	285	*
	286	* @old_parent: Pointer to "struct path".
	287	* @old_dentry: Pointer to "struct dentry".
	288	* @new_parent: Pointer to "struct path".
	289	* @new_dentry: Pointer to "struct dentry".
	290	*
	291	* Returns 0 on success, negative value otherwise.
	292	*/
f7433243 KT	293	static int tomoyo_path_rename(struct path *old_parent,
	294	struct dentry *old_dentry,
	295	struct path *new_parent,
	296	struct dentry *new_dentry)
	297	{
	298	struct path path1 = { old_parent->mnt, old_dentry };
	299	struct path path2 = { new_parent->mnt, new_dentry };
97d6931e	300	return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
f7433243 KT	301	}
f7433243 KT	302
0f2a55d5 TH	303	/**
	304	* tomoyo_file_fcntl - Target for security_file_fcntl().
	305	*
	306	* @file: Pointer to "struct file".
	307	* @cmd: Command for fcntl().
	308	* @arg: Argument for @cmd.
	309	*
	310	* Returns 0 on success, negative value otherwise.
	311	*/
f7433243 KT	312	static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
	313	unsigned long arg)
	314	{
7c75964f TH	315	if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
	316	return 0;
	317	return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
	318	O_WRONLY \| (arg & O_APPEND));
f7433243 KT	319	}
f7433243 KT	320
0f2a55d5 TH	321	/**
	322	* tomoyo_dentry_open - Target for security_dentry_open().
	323	*
	324	* @f: Pointer to "struct file".
	325	* @cred: Pointer to "struct cred".
	326	*
	327	* Returns 0 on success, negative value otherwise.
	328	*/
f7433243 KT	329	static int tomoyo_dentry_open(struct file f, const struct cred cred)
	330	{
	331	int flags = f->f_flags;
f7433243 KT	332	/* Don't check read permission here if called from do_execve(). */
	333	if (current->in_execve)
	334	return 0;
	335	return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
	336	}
	337
0f2a55d5 TH	338	/**
	339	* tomoyo_file_ioctl - Target for security_file_ioctl().
	340	*
	341	* @file: Pointer to "struct file".
	342	* @cmd: Command for ioctl().
	343	* @arg: Argument for @cmd.
	344	*
	345	* Returns 0 on success, negative value otherwise.
	346	*/
937bf613 TH	347	static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
	348	unsigned long arg)
	349	{
a1f9bb6a	350	return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
937bf613 TH	351	}
937bf613 TH	352
0f2a55d5 TH	353	/**
	354	* tomoyo_path_chmod - Target for security_path_chmod().
	355	*
	356	* @dentry: Pointer to "struct dentry".
	357	* @mnt: Pointer to "struct vfsmount".
	358	* @mode: DAC permission mode.
	359	*
	360	* Returns 0 on success, negative value otherwise.
	361	*/
937bf613 TH	362	static int tomoyo_path_chmod(struct dentry dentry, struct vfsmount mnt,
	363	mode_t mode)
	364	{
	365	struct path path = { mnt, dentry };
a1f9bb6a TH	366	return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, &path,
a1f9bb6a TH	367	mode & S_IALLUGO);
937bf613 TH	368	}
937bf613 TH	369
0f2a55d5 TH	370	/**
	371	* tomoyo_path_chown - Target for security_path_chown().
	372	*
	373	* @path: Pointer to "struct path".
	374	* @uid: Owner ID.
	375	* @gid: Group ID.
	376	*
	377	* Returns 0 on success, negative value otherwise.
	378	*/
937bf613 TH	379	static int tomoyo_path_chown(struct path *path, uid_t uid, gid_t gid)
	380	{
	381	int error = 0;
	382	if (uid != (uid_t) -1)
a1f9bb6a	383	error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path, uid);
937bf613	384	if (!error && gid != (gid_t) -1)
a1f9bb6a	385	error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path, gid);
937bf613 TH	386	return error;
	387	}
	388
0f2a55d5 TH	389	/**
	390	* tomoyo_path_chroot - Target for security_path_chroot().
	391	*
	392	* @path: Pointer to "struct path".
	393	*
	394	* Returns 0 on success, negative value otherwise.
	395	*/
937bf613 TH	396	static int tomoyo_path_chroot(struct path *path)
937bf613 TH	397	{
97fb35e4	398	return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
937bf613 TH	399	}
937bf613 TH	400
0f2a55d5 TH	401	/**
	402	* tomoyo_sb_mount - Target for security_sb_mount().
	403	*
	404	* @dev_name: Name of device file. Maybe NULL.
	405	* @path: Pointer to "struct path".
	406	* @type: Name of filesystem type. Maybe NULL.
	407	* @flags: Mount options.
	408	* @data: Optional data. Maybe NULL.
	409	*
	410	* Returns 0 on success, negative value otherwise.
	411	*/
937bf613 TH	412	static int tomoyo_sb_mount(char dev_name, struct path path,
	413	char type, unsigned long flags, void data)
	414	{
2106ccd9	415	return tomoyo_mount_permission(dev_name, path, type, flags, data);
937bf613 TH	416	}
937bf613 TH	417
0f2a55d5 TH	418	/**
	419	* tomoyo_sb_umount - Target for security_sb_umount().
	420	*
	421	* @mnt: Pointer to "struct vfsmount".
	422	* @flags: Unmount options.
	423	*
	424	* Returns 0 on success, negative value otherwise.
	425	*/
937bf613 TH	426	static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
	427	{
	428	struct path path = { mnt, mnt->mnt_root };
97fb35e4	429	return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
937bf613 TH	430	}
937bf613 TH	431
0f2a55d5 TH	432	/**
	433	* tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
	434	*
	435	* @old_path: Pointer to "struct path".
	436	* @new_path: Pointer to "struct path".
	437	*
	438	* Returns 0 on success, negative value otherwise.
	439	*/
937bf613 TH	440	static int tomoyo_sb_pivotroot(struct path old_path, struct path new_path)
937bf613 TH	441	{
97d6931e	442	return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
937bf613 TH	443	}
937bf613 TH	444
c3fa109a TH	445	/*
	446	* tomoyo_security_ops is a "struct security_operations" which is used for
	447	* registering TOMOYO.
	448	*/
f7433243 KT	449	static struct security_operations tomoyo_security_ops = {
f7433243 KT	450	.name = "tomoyo",
ee18d64c	451	.cred_alloc_blank = tomoyo_cred_alloc_blank,
f7433243	452	.cred_prepare = tomoyo_cred_prepare,
ee18d64c	453	.cred_transfer = tomoyo_cred_transfer,
ec8e6a4e	454	.cred_free = tomoyo_cred_free,
f7433243 KT	455	.bprm_set_creds = tomoyo_bprm_set_creds,
f7433243 KT	456	.bprm_check_security = tomoyo_bprm_check_security,
f7433243 KT	457	.file_fcntl = tomoyo_file_fcntl,
	458	.dentry_open = tomoyo_dentry_open,
	459	.path_truncate = tomoyo_path_truncate,
	460	.path_unlink = tomoyo_path_unlink,
	461	.path_mkdir = tomoyo_path_mkdir,
	462	.path_rmdir = tomoyo_path_rmdir,
	463	.path_symlink = tomoyo_path_symlink,
	464	.path_mknod = tomoyo_path_mknod,
	465	.path_link = tomoyo_path_link,
	466	.path_rename = tomoyo_path_rename,
7c75964f	467	.inode_getattr = tomoyo_inode_getattr,
937bf613 TH	468	.file_ioctl = tomoyo_file_ioctl,
	469	.path_chmod = tomoyo_path_chmod,
	470	.path_chown = tomoyo_path_chown,
	471	.path_chroot = tomoyo_path_chroot,
	472	.sb_mount = tomoyo_sb_mount,
	473	.sb_umount = tomoyo_sb_umount,
	474	.sb_pivotroot = tomoyo_sb_pivotroot,
f7433243 KT	475	};
f7433243 KT	476
fdb8ebb7 TH	477	/* Lock for GC. */
	478	struct srcu_struct tomoyo_ss;
	479
0f2a55d5 TH	480	/**
	481	* tomoyo_init - Register TOMOYO Linux as a LSM module.
	482	*
	483	* Returns 0.
	484	*/
f7433243 KT	485	static int __init tomoyo_init(void)
	486	{
	487	struct cred cred = (struct cred ) current_cred();
	488
	489	if (!security_module_enable(&tomoyo_security_ops))
	490	return 0;
	491	/* register ourselves with the security framework */
fdb8ebb7 TH	492	if (register_security(&tomoyo_security_ops) \|\|
fdb8ebb7 TH	493	init_srcu_struct(&tomoyo_ss))
f7433243 KT	494	panic("Failure registering TOMOYO Linux");
	495	printk(KERN_INFO "TOMOYO Linux initialized\n");
	496	cred->security = &tomoyo_kernel_domain;
c3ef1500	497	tomoyo_mm_init();
f7433243 KT	498	return 0;
	499	}
	500
	501	security_initcall(tomoyo_init);