xattr_security.c
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/*
* linux/fs/hfsplus/xattr_trusted.c
*
* Vyacheslav Dubeyko <slava@dubeyko.com>
*
* Handler for storing security labels as extended attributes.
*/
#include <linux/security.h>
#include "hfsplus_fs.h"
#include "xattr.h"
#include "acl.h"
static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
void *buffer, size_t size, int type)
{
char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
size_t len = strlen(name);
if (!strcmp(name, ""))
return -EINVAL;
if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
return -EOPNOTSUPP;
strcpy(xattr_name, XATTR_SECURITY_PREFIX);
strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
return hfsplus_getxattr(dentry, xattr_name, buffer, size);
}
static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
const void *buffer, size_t size, int flags, int type)
{
char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
size_t len = strlen(name);
if (!strcmp(name, ""))
return -EINVAL;
if (len + XATTR_SECURITY_PREFIX_LEN > HFSPLUS_ATTR_MAX_STRLEN)
return -EOPNOTSUPP;
strcpy(xattr_name, XATTR_SECURITY_PREFIX);
strcpy(xattr_name + XATTR_SECURITY_PREFIX_LEN, name);
return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
}
static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
size_t list_size, const char *name, size_t name_len, int type)
{
/*
* This method is not used.
* It is used hfsplus_listxattr() instead of generic_listxattr().
*/
return -EOPNOTSUPP;
}
static int hfsplus_initxattrs(struct inode *inode,
const struct xattr *xattr_array,
void *fs_info)
{
const struct xattr *xattr;
char xattr_name[HFSPLUS_ATTR_MAX_STRLEN + 1] = {0};
size_t xattr_name_len;
int err = 0;
for (xattr = xattr_array; xattr->name != NULL; xattr++) {
xattr_name_len = strlen(xattr->name);
if (xattr_name_len == 0)
continue;
if (xattr_name_len + XATTR_SECURITY_PREFIX_LEN >
HFSPLUS_ATTR_MAX_STRLEN)
return -EOPNOTSUPP;
strcpy(xattr_name, XATTR_SECURITY_PREFIX);
strcpy(xattr_name +
XATTR_SECURITY_PREFIX_LEN, xattr->name);
memset(xattr_name +
XATTR_SECURITY_PREFIX_LEN + xattr_name_len, 0, 1);
err = __hfsplus_setxattr(inode, xattr_name,
xattr->value, xattr->value_len, 0);
if (err)
break;
}
return err;
}
int hfsplus_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr)
{
return security_inode_init_security(inode, dir, qstr,
&hfsplus_initxattrs, NULL);
}
int hfsplus_init_inode_security(struct inode *inode,
struct inode *dir,
const struct qstr *qstr)
{
int err;
err = hfsplus_init_posix_acl(inode, dir);
if (!err)
err = hfsplus_init_security(inode, dir, qstr);
return err;
}
const struct xattr_handler hfsplus_xattr_security_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.list = hfsplus_security_listxattr,
.get = hfsplus_security_getxattr,
.set = hfsplus_security_setxattr,
};