128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include "reiserfs.h"
|
|
#include <linux/errno.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/slab.h>
|
|
#include "xattr.h"
|
|
#include <linux/security.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
static int
|
|
security_get(const struct xattr_handler *handler, struct dentry *unused,
|
|
struct inode *inode, const char *name, void *buffer, size_t size)
|
|
{
|
|
if (IS_PRIVATE(inode))
|
|
return -EPERM;
|
|
|
|
return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
|
|
buffer, size);
|
|
}
|
|
|
|
static int
|
|
security_set(const struct xattr_handler *handler,
|
|
struct mnt_idmap *idmap, struct dentry *unused,
|
|
struct inode *inode, const char *name, const void *buffer,
|
|
size_t size, int flags)
|
|
{
|
|
if (IS_PRIVATE(inode))
|
|
return -EPERM;
|
|
|
|
return reiserfs_xattr_set(inode,
|
|
xattr_full_name(handler, name),
|
|
buffer, size, flags);
|
|
}
|
|
|
|
static bool security_list(struct dentry *dentry)
|
|
{
|
|
return !IS_PRIVATE(d_inode(dentry));
|
|
}
|
|
|
|
static int
|
|
reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
|
|
void *fs_info)
|
|
{
|
|
struct reiserfs_security_handle *sec = fs_info;
|
|
|
|
sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
|
|
GFP_KERNEL);
|
|
if (!sec->value)
|
|
return -ENOMEM;
|
|
|
|
sec->name = xattr_array->name;
|
|
sec->length = xattr_array->value_len;
|
|
return 0;
|
|
}
|
|
|
|
/* Initializes the security context for a new inode and returns the number
|
|
* of blocks needed for the transaction. If successful, reiserfs_security
|
|
* must be released using reiserfs_security_free when the caller is done. */
|
|
int reiserfs_security_init(struct inode *dir, struct inode *inode,
|
|
const struct qstr *qstr,
|
|
struct reiserfs_security_handle *sec)
|
|
{
|
|
int blocks = 0;
|
|
int error;
|
|
|
|
sec->name = NULL;
|
|
sec->value = NULL;
|
|
sec->length = 0;
|
|
|
|
/* Don't add selinux attributes on xattrs - they'll never get used */
|
|
if (IS_PRIVATE(dir))
|
|
return 0;
|
|
|
|
error = security_inode_init_security(inode, dir, qstr,
|
|
&reiserfs_initxattrs, sec);
|
|
if (error) {
|
|
sec->name = NULL;
|
|
sec->value = NULL;
|
|
sec->length = 0;
|
|
return error;
|
|
}
|
|
|
|
if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
|
|
blocks = reiserfs_xattr_jcreate_nblocks(inode) +
|
|
reiserfs_xattr_nblocks(inode, sec->length);
|
|
/* We don't want to count the directories twice if we have
|
|
* a default ACL. */
|
|
REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
|
|
}
|
|
return blocks;
|
|
}
|
|
|
|
int reiserfs_security_write(struct reiserfs_transaction_handle *th,
|
|
struct inode *inode,
|
|
struct reiserfs_security_handle *sec)
|
|
{
|
|
char xattr_name[XATTR_NAME_MAX + 1] = XATTR_SECURITY_PREFIX;
|
|
int error;
|
|
|
|
if (XATTR_SECURITY_PREFIX_LEN + strlen(sec->name) > XATTR_NAME_MAX)
|
|
return -EINVAL;
|
|
|
|
strlcat(xattr_name, sec->name, sizeof(xattr_name));
|
|
|
|
error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value,
|
|
sec->length, XATTR_CREATE);
|
|
if (error == -ENODATA || error == -EOPNOTSUPP)
|
|
error = 0;
|
|
|
|
return error;
|
|
}
|
|
|
|
void reiserfs_security_free(struct reiserfs_security_handle *sec)
|
|
{
|
|
kfree(sec->value);
|
|
sec->name = NULL;
|
|
sec->value = NULL;
|
|
}
|
|
|
|
const struct xattr_handler reiserfs_xattr_security_handler = {
|
|
.prefix = XATTR_SECURITY_PREFIX,
|
|
.get = security_get,
|
|
.set = security_set,
|
|
.list = security_list,
|
|
};
|