[mirror_ubuntu-artful-kernel.git] / fs / ext3 / xattr_security.c

/*
 * linux/fs/ext3/xattr_security.c
 * Handler for storing security labels as extended attributes.
 */

#include <linux/security.h>
#include "ext3.h"
#include "xattr.h"

static size_t
ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
			 const char *name, size_t name_len, int type)
{
	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
	const size_t total_len = prefix_len + name_len + 1;


	if (list && total_len <= list_size) {
		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
		memcpy(list+prefix_len, name, name_len);
		list[prefix_len + name_len] = '\0';
	}
	return total_len;
}

static int
ext3_xattr_security_get(struct dentry *dentry, const char *name,
		void *buffer, size_t size, int type)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
			      name, buffer, size);
}

static int
ext3_xattr_security_set(struct dentry *dentry, const char *name,
		const void *value, size_t size, int flags, int type)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
			      name, value, size, flags);
}

static int ext3_initxattrs(struct inode *inode,
			   const struct xattr *xattr_array,
			   void *fs_info)
{
	const struct xattr *xattr;
	handle_t *handle = fs_info;
	int err = 0;

	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
		err = ext3_xattr_set_handle(handle, inode,
					    EXT3_XATTR_INDEX_SECURITY,
					    xattr->name, xattr->value,
					    xattr->value_len, 0);
		if (err < 0)
			break;
	}
	return err;
}

int
ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
		   const struct qstr *qstr)
{
	return security_inode_init_security(inode, dir, qstr,
					    &ext3_initxattrs, handle);
}

const struct xattr_handler ext3_xattr_security_handler = {
	.prefix	= XATTR_SECURITY_PREFIX,
	.list	= ext3_xattr_security_list,
	.get	= ext3_xattr_security_get,
	.set	= ext3_xattr_security_set,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext3/xattr_security.c
	3	* Handler for storing security labels as extended attributes.
	4	*/
	5
ac50960a	6	#include <linux/security.h>
4613ad18	7	#include "ext3.h"
1da177e4 LT	8	#include "xattr.h"
	9
	10	static size_t
431547b3 CH	11	ext3_xattr_security_list(struct dentry dentry, char list, size_t list_size,
431547b3 CH	12	const char *name, size_t name_len, int type)
1da177e4	13	{
ef1afd39	14	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
1da177e4 LT	15	const size_t total_len = prefix_len + name_len + 1;
	16
	17
	18	if (list && total_len <= list_size) {
	19	memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
	20	memcpy(list+prefix_len, name, name_len);
	21	list[prefix_len + name_len] = '\0';
	22	}
	23	return total_len;
	24	}
	25
	26	static int
431547b3 CH	27	ext3_xattr_security_get(struct dentry dentry, const char name,
431547b3 CH	28	void *buffer, size_t size, int type)
1da177e4 LT	29	{
	30	if (strcmp(name, "") == 0)
	31	return -EINVAL;
2b0143b5	32	return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
431547b3	33	name, buffer, size);
1da177e4 LT	34	}
	35
	36	static int
431547b3 CH	37	ext3_xattr_security_set(struct dentry dentry, const char name,
431547b3 CH	38	const void *value, size_t size, int flags, int type)
1da177e4 LT	39	{
	40	if (strcmp(name, "") == 0)
	41	return -EINVAL;
2b0143b5	42	return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_SECURITY,
431547b3	43	name, value, size, flags);
1da177e4 LT	44	}
1da177e4 LT	45
7d6c2113 RK	46	static int ext3_initxattrs(struct inode *inode,
	47	const struct xattr *xattr_array,
	48	void *fs_info)
ac50960a	49	{
9d8f13ba MZ	50	const struct xattr *xattr;
	51	handle_t *handle = fs_info;
	52	int err = 0;
ac50960a	53
9d8f13ba MZ	54	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
	55	err = ext3_xattr_set_handle(handle, inode,
	56	EXT3_XATTR_INDEX_SECURITY,
	57	xattr->name, xattr->value,
	58	xattr->value_len, 0);
	59	if (err < 0)
	60	break;
ac50960a	61	}
ac50960a SS	62	return err;
	63	}
	64
9d8f13ba MZ	65	int
	66	ext3_init_security(handle_t handle, struct inode inode, struct inode *dir,
	67	const struct qstr *qstr)
	68	{
	69	return security_inode_init_security(inode, dir, qstr,
	70	&ext3_initxattrs, handle);
	71	}
	72
d1f21049	73	const struct xattr_handler ext3_xattr_security_handler = {
1da177e4 LT	74	.prefix = XATTR_SECURITY_PREFIX,
	75	.list = ext3_xattr_security_list,
	76	.get = ext3_xattr_security_get,
	77	.set = ext3_xattr_security_set,
	78	};