[deliverable/linux.git] / fs / ext2 / xattr_security.c

/*
 * linux/fs/ext2/xattr_security.c
 * Handler for storing security labels as extended attributes.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/smp_lock.h>
#include <linux/ext2_fs.h>
#include <linux/security.h>
#include "xattr.h"

static size_t
ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,
			 const char *name, size_t name_len)
{
	const int prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
	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
ext2_xattr_security_get(struct inode *inode, const char *name,
		       void *buffer, size_t size)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
			      buffer, size);
}

static int
ext2_xattr_security_set(struct inode *inode, const char *name,
		       const void *value, size_t size, int flags)
{
	if (strcmp(name, "") == 0)
		return -EINVAL;
	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
			      value, size, flags);
}

int
ext2_init_security(struct inode *inode, struct inode *dir)
{
	int err;
	size_t len;
	void *value;
	char *name;

	err = security_inode_init_security(inode, dir, &name, &value, &len);
	if (err) {
		if (err == -EOPNOTSUPP)
			return 0;
		return err;
	}
	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
			     name, value, len, 0);
	kfree(name);
	kfree(value);
	return err;
}

struct xattr_handler ext2_xattr_security_handler = {
	.prefix	= XATTR_SECURITY_PREFIX,
	.list	= ext2_xattr_security_list,
	.get	= ext2_xattr_security_get,
	.set	= ext2_xattr_security_set,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/xattr_security.c
	3	* Handler for storing security labels as extended attributes.
	4	*/
	5
	6	#include <linux/module.h>
	7	#include <linux/string.h>
	8	#include <linux/fs.h>
	9	#include <linux/smp_lock.h>
	10	#include <linux/ext2_fs.h>
10f47e6a	11	#include <linux/security.h>
1da177e4 LT	12	#include "xattr.h"
	13
	14	static size_t
	15	ext2_xattr_security_list(struct inode inode, char list, size_t list_size,
	16	const char *name, size_t name_len)
	17	{
	18	const int prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
	19	const size_t total_len = prefix_len + name_len + 1;
	20
	21	if (list && total_len <= list_size) {
	22	memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
	23	memcpy(list+prefix_len, name, name_len);
	24	list[prefix_len + name_len] = '\0';
	25	}
	26	return total_len;
	27	}
	28
	29	static int
	30	ext2_xattr_security_get(struct inode inode, const char name,
	31	void *buffer, size_t size)
	32	{
	33	if (strcmp(name, "") == 0)
	34	return -EINVAL;
	35	return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
	36	buffer, size);
	37	}
	38
	39	static int
	40	ext2_xattr_security_set(struct inode inode, const char name,
	41	const void *value, size_t size, int flags)
	42	{
	43	if (strcmp(name, "") == 0)
	44	return -EINVAL;
	45	return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
	46	value, size, flags);
	47	}
	48
10f47e6a SS	49	int
	50	ext2_init_security(struct inode inode, struct inode dir)
	51	{
	52	int err;
	53	size_t len;
	54	void *value;
	55	char *name;
	56
	57	err = security_inode_init_security(inode, dir, &name, &value, &len);
	58	if (err) {
	59	if (err == -EOPNOTSUPP)
	60	return 0;
	61	return err;
	62	}
	63	err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
	64	name, value, len, 0);
	65	kfree(name);
	66	kfree(value);
	67	return err;
	68	}
	69
1da177e4 LT	70	struct xattr_handler ext2_xattr_security_handler = {
	71	.prefix = XATTR_SECURITY_PREFIX,
	72	.list = ext2_xattr_security_list,
	73	.get = ext2_xattr_security_get,
	74	.set = ext2_xattr_security_set,
	75	};