Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file is part of UBIFS.
 *
 * Copyright (C) 2006-2008 Nokia Corporation.
 *
 * Authors: Artem Bityutskiy (Битюцкий Артём)
 *          Adrian Hunter
 */
 
/*
 * This file implements UBIFS extended attributes support.
 *
 * Extended attributes are implemented as regular inodes with attached data,
 * which limits extended attribute size to UBIFS block size (4KiB). Names of
 * extended attributes are described by extended attribute entries (xentries),
 * which are almost identical to directory entries, but have different key type.
 *
 * In other words, the situation with extended attributes is very similar to
 * directories. Indeed, any inode (but of course not xattr inodes) may have a
 * number of associated xentries, just like directory inodes have associated
 * directory entries. Extended attribute entries store the name of the extended
 * attribute, the host inode number, and the extended attribute inode number.
 * Similarly, direntries store the name, the parent and the target inode
 * numbers. Thus, most of the common UBIFS mechanisms may be re-used for
 * extended attributes.
 *
 * The number of extended attributes is not limited, but there is Linux
 * limitation on the maximum possible size of the list of all extended
 * attributes associated with an inode (%XATTR_LIST_MAX), so UBIFS makes sure
 * the sum of all extended attribute names of the inode does not exceed that
 * limit.
 *
 * Extended attributes are synchronous, which means they are written to the
 * flash media synchronously and there is no write-back for extended attribute
 * inodes. The extended attribute values are not stored in compressed form on
 * the media.
 *
 * Since extended attributes are represented by regular inodes, they are cached
 * in the VFS inode cache. The xentries are cached in the LNC cache (see
 * tnc.c).
 *
 * ACL support is not implemented.
 */
 
#include "ubifs.h"
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/xattr.h>
 
/*
 * Extended attribute type constants.
 *
 * USER_XATTR: user extended attribute ("user.*")
 * TRUSTED_XATTR: trusted extended attribute ("trusted.*)
 * SECURITY_XATTR: security extended attribute ("security.*")
 */
enum {
<------>USER_XATTR,
<------>TRUSTED_XATTR,
<------>SECURITY_XATTR,
};
 
static const struct inode_operations empty_iops;
static const struct file_operations empty_fops;
 
/**
 * create_xattr - create an extended attribute.
 * @c: UBIFS file-system description object
 * @host: host inode
 * @nm: extended attribute name
 * @value: extended attribute value
 * @size: size of extended attribute value
 *
 * This is a helper function which creates an extended attribute of name @nm
 * and value @value for inode @host. The host inode is also updated on flash
 * because the ctime and extended attribute accounting data changes. This
 * function returns zero in case of success and a negative error code in case
 * of failure.
 */
static int create_xattr(struct ubifs_info *c, struct inode *host,
<------><------><------>const struct fscrypt_name *nm, const void *value, int size)
{
<------>int err, names_len;
<------>struct inode *inode;
<------>struct ubifs_inode *ui, *host_ui = ubifs_inode(host);
<------>struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
<------><------><------><------>.new_ino_d = ALIGN(size, 8), .dirtied_ino = 1,
<------><------><------><------>.dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
 
<------>if (host_ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) {
<------><------>ubifs_err(c, "inode %lu already has too many xattrs (%d), cannot create more",
<------><------><------>  host->i_ino, host_ui->xattr_cnt);
<------><------>return -ENOSPC;
<------>}
<------>/*
<------> * Linux limits the maximum size of the extended attribute names list
<------> * to %XATTR_LIST_MAX. This means we should not allow creating more
<------> * extended attributes if the name list becomes larger. This limitation
<------> * is artificial for UBIFS, though.
<------> */
<------>names_len = host_ui->xattr_names + host_ui->xattr_cnt + fname_len(nm) + 1;
<------>if (names_len > XATTR_LIST_MAX) {
<------><------>ubifs_err(c, "cannot add one more xattr name to inode %lu, total names length would become %d, max. is %d",
<------><------><------>  host->i_ino, names_len, XATTR_LIST_MAX);
<------><------>return -ENOSPC;
<------>}
 
<------>err = ubifs_budget_space(c, &req);
<------>if (err)
<------><------>return err;
 
<------>inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO);
<------>if (IS_ERR(inode)) {
<------><------>err = PTR_ERR(inode);
<------><------>goto out_budg;
<------>}
 
<------>/* Re-define all operations to be "nothing" */
<------>inode->i_mapping->a_ops = &empty_aops;
<------>inode->i_op = &empty_iops;
<------>inode->i_fop = &empty_fops;
 
<------>inode->i_flags |= S_SYNC | S_NOATIME | S_NOCMTIME;
<------>ui = ubifs_inode(inode);
<------>ui->xattr = 1;
<------>ui->flags |= UBIFS_XATTR_FL;
<------>ui->data = kmemdup(value, size, GFP_NOFS);
<------>if (!ui->data) {
<------><------>err = -ENOMEM;
<------><------>goto out_free;
<------>}
<------>inode->i_size = ui->ui_size = size;
<------>ui->data_len = size;
 
<------>mutex_lock(&host_ui->ui_mutex);
<------>host->i_ctime = current_time(host);
<------>host_ui->xattr_cnt += 1;
<------>host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
<------>host_ui->xattr_size += CALC_XATTR_BYTES(size);
<------>host_ui->xattr_names += fname_len(nm);
 
<------>/*
<------> * We handle UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT here because we
<------> * have to set the UBIFS_CRYPT_FL flag on the host inode.
<------> * To avoid multiple updates of the same inode in the same operation,
<------> * let's do it here.
<------> */
<------>if (strcmp(fname_name(nm), UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
<------><------>host_ui->flags |= UBIFS_CRYPT_FL;
 
<------>err = ubifs_jnl_update(c, host, nm, inode, 0, 1);
<------>if (err)
<------><------>goto out_cancel;
<------>ubifs_set_inode_flags(host);
<------>mutex_unlock(&host_ui->ui_mutex);
 
<------>ubifs_release_budget(c, &req);
<------>insert_inode_hash(inode);
<------>iput(inode);
<------>return 0;
 
out_cancel:
<------>host_ui->xattr_cnt -= 1;
<------>host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
<------>host_ui->xattr_size -= CALC_XATTR_BYTES(size);
<------>host_ui->xattr_names -= fname_len(nm);
<------>host_ui->flags &= ~UBIFS_CRYPT_FL;
<------>mutex_unlock(&host_ui->ui_mutex);
out_free:
<------>make_bad_inode(inode);
<------>iput(inode);
out_budg:
<------>ubifs_release_budget(c, &req);
<------>return err;
}
 
/**
 * change_xattr - change an extended attribute.
 * @c: UBIFS file-system description object
 * @host: host inode
 * @inode: extended attribute inode
 * @value: extended attribute value
 * @size: size of extended attribute value
 *
 * This helper function changes the value of extended attribute @inode with new
 * data from @value. Returns zero in case of success and a negative error code
 * in case of failure.
 */
static int change_xattr(struct ubifs_info *c, struct inode *host,
<------><------><------>struct inode *inode, const void *value, int size)
{
<------>int err;
<------>struct ubifs_inode *host_ui = ubifs_inode(host);
<------>struct ubifs_inode *ui = ubifs_inode(inode);
<------>void *buf = NULL;
<------>int old_size;
<------>struct ubifs_budget_req req = { .dirtied_ino = 2,
<------><------>.dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) };
 
<------>ubifs_assert(c, ui->data_len == inode->i_size);
<------>err = ubifs_budget_space(c, &req);
<------>if (err)
<------><------>return err;
 
<------>buf = kmemdup(value, size, GFP_NOFS);
<------>if (!buf) {
<------><------>err = -ENOMEM;
<------><------>goto out_free;
<------>}
<------>mutex_lock(&ui->ui_mutex);
<------>kfree(ui->data);
<------>ui->data = buf;
<------>inode->i_size = ui->ui_size = size;
<------>old_size = ui->data_len;
<------>ui->data_len = size;
<------>mutex_unlock(&ui->ui_mutex);
 
<------>mutex_lock(&host_ui->ui_mutex);
<------>host->i_ctime = current_time(host);
<------>host_ui->xattr_size -= CALC_XATTR_BYTES(old_size);
<------>host_ui->xattr_size += CALC_XATTR_BYTES(size);
 
<------>/*
<------> * It is important to write the host inode after the xattr inode
<------> * because if the host inode gets synchronized (via 'fsync()'), then
<------> * the extended attribute inode gets synchronized, because it goes
<------> * before the host inode in the write-buffer.
<------> */
<------>err = ubifs_jnl_change_xattr(c, inode, host);
<------>if (err)
<------><------>goto out_cancel;
<------>mutex_unlock(&host_ui->ui_mutex);
 
<------>ubifs_release_budget(c, &req);
<------>return 0;
 
out_cancel:
<------>host_ui->xattr_size -= CALC_XATTR_BYTES(size);
<------>host_ui->xattr_size += CALC_XATTR_BYTES(old_size);
<------>mutex_unlock(&host_ui->ui_mutex);
<------>make_bad_inode(inode);
out_free:
<------>ubifs_release_budget(c, &req);
<------>return err;
}
 
static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
{
<------>struct inode *inode;
 
<------>inode = ubifs_iget(c->vfs_sb, inum);
<------>if (IS_ERR(inode)) {
<------><------>ubifs_err(c, "dead extended attribute entry, error %d",
<------><------><------>  (int)PTR_ERR(inode));
<------><------>return inode;
<------>}
<------>if (ubifs_inode(inode)->xattr)
<------><------>return inode;
<------>ubifs_err(c, "corrupt extended attribute entry");
<------>iput(inode);
<------>return ERR_PTR(-EINVAL);
}
 
int ubifs_xattr_set(struct inode *host, const char *name, const void *value,
<------><------>    size_t size, int flags, bool check_lock)
{
<------>struct inode *inode;
<------>struct ubifs_info *c = host->i_sb->s_fs_info;
<------>struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
<------>struct ubifs_dent_node *xent;
<------>union ubifs_key key;
<------>int err;
 
<------>if (check_lock)
<------><------>ubifs_assert(c, inode_is_locked(host));
 
<------>if (size > UBIFS_MAX_INO_DATA)
<------><------>return -ERANGE;
 
<------>if (fname_len(&nm) > UBIFS_MAX_NLEN)
<------><------>return -ENAMETOOLONG;
 
<------>xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
<------>if (!xent)
<------><------>return -ENOMEM;
 
<------>down_write(&ubifs_inode(host)->xattr_sem);
<------>/*
<------> * The extended attribute entries are stored in LNC, so multiple
<------> * look-ups do not involve reading the flash.
<------> */
<------>xent_key_init(c, &key, host->i_ino, &nm);
<------>err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
<------>if (err) {
<------><------>if (err != -ENOENT)
<------><------><------>goto out_free;
 
<------><------>if (flags & XATTR_REPLACE)
<------><------><------>/* We are asked not to create the xattr */
<------><------><------>err = -ENODATA;
<------><------>else
<------><------><------>err = create_xattr(c, host, &nm, value, size);
<------><------>goto out_free;
<------>}
 
<------>if (flags & XATTR_CREATE) {
<------><------>/* We are asked not to replace the xattr */
<------><------>err = -EEXIST;
<------><------>goto out_free;
<------>}
 
<------>inode = iget_xattr(c, le64_to_cpu(xent->inum));
<------>if (IS_ERR(inode)) {
<------><------>err = PTR_ERR(inode);
<------><------>goto out_free;
<------>}
 
<------>err = change_xattr(c, host, inode, value, size);
<------>iput(inode);
 
out_free:
<------>up_write(&ubifs_inode(host)->xattr_sem);
<------>kfree(xent);
<------>return err;
}
 
ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf,
<------><------><------>size_t size)
{
<------>struct inode *inode;
<------>struct ubifs_info *c = host->i_sb->s_fs_info;
<------>struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
<------>struct ubifs_inode *ui;
<------>struct ubifs_dent_node *xent;
<------>union ubifs_key key;
<------>int err;
 
<------>if (fname_len(&nm) > UBIFS_MAX_NLEN)
<------><------>return -ENAMETOOLONG;
 
<------>xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
<------>if (!xent)
<------><------>return -ENOMEM;
 
<------>down_read(&ubifs_inode(host)->xattr_sem);
<------>xent_key_init(c, &key, host->i_ino, &nm);
<------>err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
<------>if (err) {
<------><------>if (err == -ENOENT)
<------><------><------>err = -ENODATA;
<------><------>goto out_cleanup;
<------>}
 
<------>inode = iget_xattr(c, le64_to_cpu(xent->inum));
<------>if (IS_ERR(inode)) {
<------><------>err = PTR_ERR(inode);
<------><------>goto out_cleanup;
<------>}
 
<------>ui = ubifs_inode(inode);
<------>ubifs_assert(c, inode->i_size == ui->data_len);
<------>ubifs_assert(c, ubifs_inode(host)->xattr_size > ui->data_len);
 
<------>mutex_lock(&ui->ui_mutex);
<------>if (buf) {
<------><------>/* If @buf is %NULL we are supposed to return the length */
<------><------>if (ui->data_len > size) {
<------><------><------>err = -ERANGE;
<------><------><------>goto out_iput;
<------><------>}
 
<------><------>memcpy(buf, ui->data, ui->data_len);
<------>}
<------>err = ui->data_len;
 
out_iput:
<------>mutex_unlock(&ui->ui_mutex);
<------>iput(inode);
out_cleanup:
<------>up_read(&ubifs_inode(host)->xattr_sem);
<------>kfree(xent);
<------>return err;
}
 
static bool xattr_visible(const char *name)
{
<------>/* File encryption related xattrs are for internal use only */
<------>if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
<------><------>return false;
 
<------>/* Show trusted namespace only for "power" users */
<------>if (strncmp(name, XATTR_TRUSTED_PREFIX,
<------><------>    XATTR_TRUSTED_PREFIX_LEN) == 0 && !capable(CAP_SYS_ADMIN))
<------><------>return false;
 
<------>return true;
}
 
ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
{
<------>union ubifs_key key;
<------>struct inode *host = d_inode(dentry);
<------>struct ubifs_info *c = host->i_sb->s_fs_info;
<------>struct ubifs_inode *host_ui = ubifs_inode(host);
<------>struct ubifs_dent_node *xent, *pxent = NULL;
<------>int err, len, written = 0;
<------>struct fscrypt_name nm = {0};
 
<------>dbg_gen("ino %lu ('%pd'), buffer size %zd", host->i_ino,
<------><------>dentry, size);
 
<------>down_read(&host_ui->xattr_sem);
<------>len = host_ui->xattr_names + host_ui->xattr_cnt;
<------>if (!buffer) {
<------><------>/*
<------><------> * We should return the minimum buffer size which will fit a
<------><------> * null-terminated list of all the extended attribute names.
<------><------> */
<------><------>err = len;
<------><------>goto out_err;
<------>}
 
<------>if (len > size) {
<------><------>err = -ERANGE;
<------><------>goto out_err;
<------>}
 
<------>lowest_xent_key(c, &key, host->i_ino);
<------>while (1) {
<------><------>xent = ubifs_tnc_next_ent(c, &key, &nm);
<------><------>if (IS_ERR(xent)) {
<------><------><------>err = PTR_ERR(xent);
<------><------><------>break;
<------><------>}
 
<------><------>fname_name(&nm) = xent->name;
<------><------>fname_len(&nm) = le16_to_cpu(xent->nlen);
 
<------><------>if (xattr_visible(xent->name)) {
<------><------><------>memcpy(buffer + written, fname_name(&nm), fname_len(&nm) + 1);
<------><------><------>written += fname_len(&nm) + 1;
<------><------>}
 
<------><------>kfree(pxent);
<------><------>pxent = xent;
<------><------>key_read(c, &xent->key, &key);
<------>}
<------>kfree(pxent);
<------>up_read(&host_ui->xattr_sem);
 
<------>if (err != -ENOENT) {
<------><------>ubifs_err(c, "cannot find next direntry, error %d", err);
<------><------>return err;
<------>}
 
<------>ubifs_assert(c, written <= size);
<------>return written;
 
out_err:
<------>up_read(&host_ui->xattr_sem);
<------>return err;
}
 
static int remove_xattr(struct ubifs_info *c, struct inode *host,
<------><------><------>struct inode *inode, const struct fscrypt_name *nm)
{
<------>int err;
<------>struct ubifs_inode *host_ui = ubifs_inode(host);
<------>struct ubifs_inode *ui = ubifs_inode(inode);
<------>struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1,
<------><------><------><------>.dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
 
<------>ubifs_assert(c, ui->data_len == inode->i_size);
 
<------>err = ubifs_budget_space(c, &req);
<------>if (err)
<------><------>return err;
 
<------>mutex_lock(&host_ui->ui_mutex);
<------>host->i_ctime = current_time(host);
<------>host_ui->xattr_cnt -= 1;
<------>host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
<------>host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
<------>host_ui->xattr_names -= fname_len(nm);
 
<------>err = ubifs_jnl_delete_xattr(c, host, inode, nm);
<------>if (err)
<------><------>goto out_cancel;
<------>mutex_unlock(&host_ui->ui_mutex);
 
<------>ubifs_release_budget(c, &req);
<------>return 0;
 
out_cancel:
<------>host_ui->xattr_cnt += 1;
<------>host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
<------>host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
<------>host_ui->xattr_names += fname_len(nm);
<------>mutex_unlock(&host_ui->ui_mutex);
<------>ubifs_release_budget(c, &req);
<------>make_bad_inode(inode);
<------>return err;
}
 
int ubifs_purge_xattrs(struct inode *host)
{
<------>union ubifs_key key;
<------>struct ubifs_info *c = host->i_sb->s_fs_info;
<------>struct ubifs_dent_node *xent, *pxent = NULL;
<------>struct inode *xino;
<------>struct fscrypt_name nm = {0};
<------>int err;
 
<------>if (ubifs_inode(host)->xattr_cnt <= ubifs_xattr_max_cnt(c))
<------><------>return 0;
 
<------>ubifs_warn(c, "inode %lu has too many xattrs, doing a non-atomic deletion",
<------><------>   host->i_ino);
 
<------>down_write(&ubifs_inode(host)->xattr_sem);
<------>lowest_xent_key(c, &key, host->i_ino);
<------>while (1) {
<------><------>xent = ubifs_tnc_next_ent(c, &key, &nm);
<------><------>if (IS_ERR(xent)) {
<------><------><------>err = PTR_ERR(xent);
<------><------><------>break;
<------><------>}
 
<------><------>fname_name(&nm) = xent->name;
<------><------>fname_len(&nm) = le16_to_cpu(xent->nlen);
 
<------><------>xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum));
<------><------>if (IS_ERR(xino)) {
<------><------><------>err = PTR_ERR(xino);
<------><------><------>ubifs_err(c, "dead directory entry '%s', error %d",
<------><------><------><------>  xent->name, err);
<------><------><------>ubifs_ro_mode(c, err);
<------><------><------>kfree(pxent);
<------><------><------>kfree(xent);
<------><------><------>goto out_err;
<------><------>}
 
<------><------>ubifs_assert(c, ubifs_inode(xino)->xattr);
 
<------><------>clear_nlink(xino);
<------><------>err = remove_xattr(c, host, xino, &nm);
<------><------>if (err) {
<------><------><------>kfree(pxent);
<------><------><------>kfree(xent);
<------><------><------>iput(xino);
<------><------><------>ubifs_err(c, "cannot remove xattr, error %d", err);
<------><------><------>goto out_err;
<------><------>}
 
<------><------>iput(xino);
 
<------><------>kfree(pxent);
<------><------>pxent = xent;
<------><------>key_read(c, &xent->key, &key);
<------>}
<------>kfree(pxent);
<------>up_write(&ubifs_inode(host)->xattr_sem);
 
<------>if (err != -ENOENT) {
<------><------>ubifs_err(c, "cannot find next direntry, error %d", err);
<------><------>return err;
<------>}
 
<------>return 0;
 
out_err:
<------>up_write(&ubifs_inode(host)->xattr_sem);
<------>return err;
}
 
/**
 * ubifs_evict_xattr_inode - Evict an xattr inode.
 * @c: UBIFS file-system description object
 * @xattr_inum: xattr inode number
 *
 * When an inode that hosts xattrs is being removed we have to make sure
 * that cached inodes of the xattrs also get removed from the inode cache
 * otherwise we'd waste memory. This function looks up an inode from the
 * inode cache and clears the link counter such that iput() will evict
 * the inode.
 */
void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum)
{
<------>struct inode *inode;
 
<------>inode = ilookup(c->vfs_sb, xattr_inum);
<------>if (inode) {
<------><------>clear_nlink(inode);
<------><------>iput(inode);
<------>}
}
 
static int ubifs_xattr_remove(struct inode *host, const char *name)
{
<------>struct inode *inode;
<------>struct ubifs_info *c = host->i_sb->s_fs_info;
<------>struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
<------>struct ubifs_dent_node *xent;
<------>union ubifs_key key;
<------>int err;
 
<------>ubifs_assert(c, inode_is_locked(host));
 
<------>if (fname_len(&nm) > UBIFS_MAX_NLEN)
<------><------>return -ENAMETOOLONG;
 
<------>xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
<------>if (!xent)
<------><------>return -ENOMEM;
 
<------>down_write(&ubifs_inode(host)->xattr_sem);
<------>xent_key_init(c, &key, host->i_ino, &nm);
<------>err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
<------>if (err) {
<------><------>if (err == -ENOENT)
<------><------><------>err = -ENODATA;
<------><------>goto out_free;
<------>}
 
<------>inode = iget_xattr(c, le64_to_cpu(xent->inum));
<------>if (IS_ERR(inode)) {
<------><------>err = PTR_ERR(inode);
<------><------>goto out_free;
<------>}
 
<------>ubifs_assert(c, inode->i_nlink == 1);
<------>clear_nlink(inode);
<------>err = remove_xattr(c, host, inode, &nm);
<------>if (err)
<------><------>set_nlink(inode, 1);
 
<------>/* If @i_nlink is 0, 'iput()' will delete the inode */
<------>iput(inode);
 
out_free:
<------>up_write(&ubifs_inode(host)->xattr_sem);
<------>kfree(xent);
<------>return err;
}
 
#ifdef CONFIG_UBIFS_FS_SECURITY
static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
<------><------>      void *fs_info)
{
<------>const struct xattr *xattr;
<------>char *name;
<------>int err = 0;
 
<------>for (xattr = xattr_array; xattr->name != NULL; xattr++) {
<------><------>name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
<------><------><------>       strlen(xattr->name) + 1, GFP_NOFS);
<------><------>if (!name) {
<------><------><------>err = -ENOMEM;
<------><------><------>break;
<------><------>}
<------><------>strcpy(name, XATTR_SECURITY_PREFIX);
<------><------>strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
<------><------>/*
<------><------> * creating a new inode without holding the inode rwsem,
<------><------> * no need to check whether inode is locked.
<------><------> */
<------><------>err = ubifs_xattr_set(inode, name, xattr->value,
<------><------><------><------>      xattr->value_len, 0, false);
<------><------>kfree(name);
<------><------>if (err < 0)
<------><------><------>break;
<------>}
 
<------>return err;
}
 
int ubifs_init_security(struct inode *dentry, struct inode *inode,
<------><------><------>const struct qstr *qstr)
{
<------>int err;
 
<------>err = security_inode_init_security(inode, dentry, qstr,
<------><------><------><------><------>   &init_xattrs, 0);
<------>if (err) {
<------><------>struct ubifs_info *c = dentry->i_sb->s_fs_info;
<------><------>ubifs_err(c, "cannot initialize security for inode %lu, error %d",
<------><------><------>  inode->i_ino, err);
<------>}
<------>return err;
}
#endif
 
static int xattr_get(const struct xattr_handler *handler,
<------><------><------>   struct dentry *dentry, struct inode *inode,
<------><------><------>   const char *name, void *buffer, size_t size,
<------><------><------>   int flags)
{
<------>dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
<------><------>inode->i_ino, dentry, size);
 
<------>name = xattr_full_name(handler, name);
<------>return ubifs_xattr_get(inode, name, buffer, size);
}
 
static int xattr_set(const struct xattr_handler *handler,
<------><------><------>   struct dentry *dentry, struct inode *inode,
<------><------><------>   const char *name, const void *value,
<------><------><------>   size_t size, int flags)
{
<------>dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
<------><------>name, inode->i_ino, dentry, size);
 
<------>name = xattr_full_name(handler, name);
 
<------>if (value)
<------><------>return ubifs_xattr_set(inode, name, value, size, flags, true);
<------>else
<------><------>return ubifs_xattr_remove(inode, name);
}
 
static const struct xattr_handler ubifs_user_xattr_handler = {
<------>.prefix = XATTR_USER_PREFIX,
<------>.get = xattr_get,
<------>.set = xattr_set,
};
 
static const struct xattr_handler ubifs_trusted_xattr_handler = {
<------>.prefix = XATTR_TRUSTED_PREFIX,
<------>.get = xattr_get,
<------>.set = xattr_set,
};
 
#ifdef CONFIG_UBIFS_FS_SECURITY
static const struct xattr_handler ubifs_security_xattr_handler = {
<------>.prefix = XATTR_SECURITY_PREFIX,
<------>.get = xattr_get,
<------>.set = xattr_set,
};
#endif
 
const struct xattr_handler *ubifs_xattr_handlers[] = {
<------>&ubifs_user_xattr_handler,
<------>&ubifs_trusted_xattr_handler,
#ifdef CONFIG_UBIFS_FS_SECURITY
<------>&ubifs_security_xattr_handler,
#endif
<------>NULL
};