77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
/*
|
|
* linux/fs/ext3/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/ext3_jbd.h>
|
|
#include <linux/ext3_fs.h>
|
|
#include <linux/security.h>
|
|
#include "xattr.h"
|
|
|
|
static size_t
|
|
ext3_xattr_security_list(struct inode *inode, char *list, size_t list_size,
|
|
const char *name, size_t name_len)
|
|
{
|
|
const size_t 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
|
|
ext3_xattr_security_get(struct inode *inode, const char *name,
|
|
void *buffer, size_t size)
|
|
{
|
|
if (strcmp(name, "") == 0)
|
|
return -EINVAL;
|
|
return ext3_xattr_get(inode, EXT3_XATTR_INDEX_SECURITY, name,
|
|
buffer, size);
|
|
}
|
|
|
|
static int
|
|
ext3_xattr_security_set(struct inode *inode, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
if (strcmp(name, "") == 0)
|
|
return -EINVAL;
|
|
return ext3_xattr_set(inode, EXT3_XATTR_INDEX_SECURITY, name,
|
|
value, size, flags);
|
|
}
|
|
|
|
int
|
|
ext3_init_security(handle_t *handle, 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 = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
|
|
name, value, len, 0);
|
|
kfree(name);
|
|
kfree(value);
|
|
return err;
|
|
}
|
|
|
|
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,
|
|
};
|