78 lines
2 KiB
C
78 lines
2 KiB
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(dentry->d_inode, 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(dentry->d_inode, 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,
|
|
};
|