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ubifs: Switch to generic xattr handlers

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Ubifs internally uses special inodes for storing xattrs. Those inodes
had NULL {get,set,remove}xattr inode operations before this change, so
xattr operations on them would fail. The super block's s_xattr field
would also apply to those special inodes. However, the inodes are not
visible outside of ubifs, and so no xattr operations will ever be
carried out on them anyway.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-04-22 19:14:00 +02:00 committed by Al Viro
parent c8b6056a50
commit 2b88fc21ca
5 changed files with 79 additions and 90 deletions
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6
fs/ubifs/dir.c
View File

@ -1182,10 +1182,10 @@ const struct inode_operations ubifs_dir_inode_operations = {
.rename = ubifs_rename,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
.setxattr = ubifs_setxattr,
.getxattr = ubifs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
.removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif

12
fs/ubifs/file.c
View File

@ -1597,10 +1597,10 @@ const struct address_space_operations ubifs_file_address_operations = {
const struct inode_operations ubifs_file_inode_operations = {
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
.setxattr = ubifs_setxattr,
.getxattr = ubifs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
.removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif
@ -1611,10 +1611,10 @@ const struct inode_operations ubifs_symlink_inode_operations = {
.get_link = simple_get_link,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
.setxattr = ubifs_setxattr,
.getxattr = ubifs_getxattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.listxattr = ubifs_listxattr,
.removexattr = ubifs_removexattr,
.removexattr = generic_removexattr,
#ifdef CONFIG_UBIFS_ATIME_SUPPORT
.update_time = ubifs_update_time,
#endif

1
fs/ubifs/super.c
View File

@ -2040,6 +2040,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
if (c->max_inode_sz > MAX_LFS_FILESIZE)
sb->s_maxbytes = c->max_inode_sz = MAX_LFS_FILESIZE;
sb->s_op = &ubifs_super_operations;
sb->s_xattr = ubifs_xattr_handlers;
mutex_lock(&c->umount_mutex);
err = mount_ubifs(c);

7
fs/ubifs/ubifs.h
View File

@ -37,6 +37,7 @@
#include <linux/pagemap.h>
#include <linux/backing-dev.h>
#include <linux/security.h>
#include <linux/xattr.h>
#include "ubifs-media.h"
/* Version of this UBIFS implementation */
@ -1732,12 +1733,8 @@ int ubifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
/* xattr.c */
int ubifs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags);
ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
const char *name, void *buf, size_t size);
extern const struct xattr_handler *ubifs_xattr_handlers[];
ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size);
int ubifs_removexattr(struct dentry *dentry, const char *name);
int ubifs_init_security(struct inode *dentry, struct inode *inode,
const struct qstr *qstr);

143
fs/ubifs/xattr.c
View File

@ -249,42 +249,6 @@ out_free:
return err;
}
/**
* check_namespace - check extended attribute name-space.
* @nm: extended attribute name
*
* This function makes sure the extended attribute name belongs to one of the
* supported extended attribute name-spaces. Returns name-space index in case
* of success and a negative error code in case of failure.
*/
static int check_namespace(const struct qstr *nm)
{
int type;
if (nm->len > UBIFS_MAX_NLEN)
return -ENAMETOOLONG;
if (!strncmp(nm->name, XATTR_TRUSTED_PREFIX,
XATTR_TRUSTED_PREFIX_LEN)) {
if (nm->name[XATTR_TRUSTED_PREFIX_LEN] == '\0')
return -EINVAL;
type = TRUSTED_XATTR;
} else if (!strncmp(nm->name, XATTR_USER_PREFIX,
XATTR_USER_PREFIX_LEN)) {
if (nm->name[XATTR_USER_PREFIX_LEN] == '\0')
return -EINVAL;
type = USER_XATTR;
} else if (!strncmp(nm->name, XATTR_SECURITY_PREFIX,
XATTR_SECURITY_PREFIX_LEN)) {
if (nm->name[XATTR_SECURITY_PREFIX_LEN] == '\0')
return -EINVAL;
type = SECURITY_XATTR;
} else
return -EOPNOTSUPP;
return type;
}
static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
{
struct inode *inode;
@ -302,24 +266,23 @@ static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
return ERR_PTR(-EINVAL);
}
static int setxattr(struct inode *host, const char *name, const void *value,
size_t size, int flags)
static int __ubifs_setxattr(struct inode *host, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
struct qstr nm = QSTR_INIT(name, strlen(name));
struct ubifs_dent_node *xent;
union ubifs_key key;
int err, type;
int err;
ubifs_assert(inode_is_locked(host));
if (size > UBIFS_MAX_INO_DATA)
return -ERANGE;
type = check_namespace(&nm);
if (type < 0)
return type;
if (nm.len > UBIFS_MAX_NLEN)
return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@ -363,17 +326,8 @@ out_free:
return err;
}
int ubifs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
name, d_inode(dentry)->i_ino, dentry, size);
return setxattr(d_inode(dentry), name, value, size, flags);
}
ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
const char *name, void *buf, size_t size)
static ssize_t __ubifs_getxattr(struct inode *host, const char *name,
void *buf, size_t size)
{
struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
@ -383,12 +337,8 @@ ssize_t ubifs_getxattr(struct dentry *dentry, struct inode *host,
union ubifs_key key;
int err;
dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
host->i_ino, dentry, size);
err = check_namespace(&nm);
if (err < 0)
return err;
if (nm.len > UBIFS_MAX_NLEN)
return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@ -460,8 +410,6 @@ ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
lowest_xent_key(c, &key, host->i_ino);
while (1) {
int type;
xent = ubifs_tnc_next_ent(c, &key, &nm);
if (IS_ERR(xent)) {
err = PTR_ERR(xent);
@ -471,14 +419,10 @@ ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
nm.name = xent->name;
nm.len = le16_to_cpu(xent->nlen);
type = check_namespace(&nm);
if (unlikely(type < 0)) {
err = type;
break;
}
/* Show trusted namespace only for "power" users */
if (type != TRUSTED_XATTR || capable(CAP_SYS_ADMIN)) {
if (strncmp(xent->name, XATTR_TRUSTED_PREFIX,
XATTR_TRUSTED_PREFIX_LEN) ||
capable(CAP_SYS_ADMIN)) {
memcpy(buffer + written, nm.name, nm.len + 1);
written += nm.len + 1;
}
@ -538,22 +482,19 @@ out_cancel:
return err;
}
int ubifs_removexattr(struct dentry *dentry, const char *name)
static int __ubifs_removexattr(struct inode *host, const char *name)
{
struct inode *inode, *host = d_inode(dentry);
struct inode *inode;
struct ubifs_info *c = host->i_sb->s_fs_info;
struct qstr nm = QSTR_INIT(name, strlen(name));
struct ubifs_dent_node *xent;
union ubifs_key key;
int err;
dbg_gen("xattr '%s', ino %lu ('%pd')", name,
host->i_ino, dentry);
ubifs_assert(inode_is_locked(host));
err = check_namespace(&nm);
if (err < 0)
return err;
if (nm.len > UBIFS_MAX_NLEN)
return -ENAMETOOLONG;
xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
if (!xent)
@ -603,7 +544,7 @@ static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
}
strcpy(name, XATTR_SECURITY_PREFIX);
strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
err = setxattr(inode, name, xattr->value, xattr->value_len, 0);
err = __ubifs_setxattr(inode, name, xattr->value, xattr->value_len, 0);
kfree(name);
if (err < 0)
break;
@ -626,3 +567,53 @@ int ubifs_init_security(struct inode *dentry, struct inode *inode,
}
return err;
}
static int ubifs_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *buffer, size_t size)
{
dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
inode->i_ino, dentry, size);
return __ubifs_getxattr(inode, name, buffer, size);
}
static int ubifs_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_inode(dentry);
dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
name, inode->i_ino, dentry, size);
if (value)
return __ubifs_setxattr(inode, name, value, size, flags);
else
return __ubifs_removexattr(inode, name);
}
const struct xattr_handler ubifs_user_xattr_handler = {
.prefix = XATTR_USER_PREFIX,
.get = ubifs_xattr_get,
.set = ubifs_xattr_set,
};
const struct xattr_handler ubifs_trusted_xattr_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.get = ubifs_xattr_get,
.set = ubifs_xattr_set,
};
const struct xattr_handler ubifs_security_xattr_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = ubifs_xattr_get,
.set = ubifs_xattr_set,
};
const struct xattr_handler *ubifs_xattr_handlers[] = {
&ubifs_user_xattr_handler,
&ubifs_trusted_xattr_handler,
&ubifs_security_xattr_handler,
NULL
};