^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This file is part of UBIFS.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2006-2008 Nokia Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Authors: Artem Bityutskiy (Битюцкий Артём)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Adrian Hunter
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * This file implements UBIFS extended attributes support.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Extended attributes are implemented as regular inodes with attached data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * which limits extended attribute size to UBIFS block size (4KiB). Names of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * extended attributes are described by extended attribute entries (xentries),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * which are almost identical to directory entries, but have different key type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * In other words, the situation with extended attributes is very similar to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * directories. Indeed, any inode (but of course not xattr inodes) may have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * number of associated xentries, just like directory inodes have associated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * directory entries. Extended attribute entries store the name of the extended
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * attribute, the host inode number, and the extended attribute inode number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Similarly, direntries store the name, the parent and the target inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * numbers. Thus, most of the common UBIFS mechanisms may be re-used for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * extended attributes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * The number of extended attributes is not limited, but there is Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * limitation on the maximum possible size of the list of all extended
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * attributes associated with an inode (%XATTR_LIST_MAX), so UBIFS makes sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * the sum of all extended attribute names of the inode does not exceed that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * limit.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Extended attributes are synchronous, which means they are written to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * flash media synchronously and there is no write-back for extended attribute
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * inodes. The extended attribute values are not stored in compressed form on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * the media.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * Since extended attributes are represented by regular inodes, they are cached
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * in the VFS inode cache. The xentries are cached in the LNC cache (see
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * tnc.c).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * ACL support is not implemented.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include "ubifs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * Extended attribute type constants.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * USER_XATTR: user extended attribute ("user.*")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * TRUSTED_XATTR: trusted extended attribute ("trusted.*)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * SECURITY_XATTR: security extended attribute ("security.*")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) USER_XATTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) TRUSTED_XATTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) SECURITY_XATTR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static const struct inode_operations empty_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) static const struct file_operations empty_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * create_xattr - create an extended attribute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * @host: host inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * @nm: extended attribute name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * @value: extended attribute value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * @size: size of extended attribute value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * This is a helper function which creates an extended attribute of name @nm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * and value @value for inode @host. The host inode is also updated on flash
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * because the ctime and extended attribute accounting data changes. This
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * function returns zero in case of success and a negative error code in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) static int create_xattr(struct ubifs_info *c, struct inode *host,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) const struct fscrypt_name *nm, const void *value, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) int err, names_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct ubifs_inode *ui, *host_ui = ubifs_inode(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) .new_ino_d = ALIGN(size, 8), .dirtied_ino = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (host_ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ubifs_err(c, "inode %lu already has too many xattrs (%d), cannot create more",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) host->i_ino, host_ui->xattr_cnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * Linux limits the maximum size of the extended attribute names list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * to %XATTR_LIST_MAX. This means we should not allow creating more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * extended attributes if the name list becomes larger. This limitation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * is artificial for UBIFS, though.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) names_len = host_ui->xattr_names + host_ui->xattr_cnt + fname_len(nm) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (names_len > XATTR_LIST_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) ubifs_err(c, "cannot add one more xattr name to inode %lu, total names length would become %d, max. is %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) host->i_ino, names_len, XATTR_LIST_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) err = ubifs_budget_space(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) goto out_budg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* Re-define all operations to be "nothing" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) inode->i_mapping->a_ops = &empty_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) inode->i_op = &empty_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) inode->i_fop = &empty_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) inode->i_flags |= S_SYNC | S_NOATIME | S_NOCMTIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) ui = ubifs_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ui->xattr = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ui->flags |= UBIFS_XATTR_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) ui->data = kmemdup(value, size, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (!ui->data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) inode->i_size = ui->ui_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) ui->data_len = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) mutex_lock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) host->i_ctime = current_time(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) host_ui->xattr_cnt += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) host_ui->xattr_size += CALC_XATTR_BYTES(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) host_ui->xattr_names += fname_len(nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * We handle UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT here because we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) * have to set the UBIFS_CRYPT_FL flag on the host inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * To avoid multiple updates of the same inode in the same operation,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * let's do it here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (strcmp(fname_name(nm), UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) host_ui->flags |= UBIFS_CRYPT_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) err = ubifs_jnl_update(c, host, nm, inode, 0, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) goto out_cancel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) ubifs_set_inode_flags(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) insert_inode_hash(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) out_cancel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) host_ui->xattr_cnt -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) host_ui->xattr_size -= CALC_XATTR_BYTES(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) host_ui->xattr_names -= fname_len(nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) host_ui->flags &= ~UBIFS_CRYPT_FL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) make_bad_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) out_budg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * change_xattr - change an extended attribute.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * @host: host inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * @inode: extended attribute inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * @value: extended attribute value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * @size: size of extended attribute value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * This helper function changes the value of extended attribute @inode with new
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * data from @value. Returns zero in case of success and a negative error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * in case of failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) static int change_xattr(struct ubifs_info *c, struct inode *host,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct inode *inode, const void *value, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) struct ubifs_inode *host_ui = ubifs_inode(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct ubifs_inode *ui = ubifs_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) void *buf = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int old_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct ubifs_budget_req req = { .dirtied_ino = 2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) ubifs_assert(c, ui->data_len == inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) err = ubifs_budget_space(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) buf = kmemdup(value, size, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (!buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) mutex_lock(&ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) kfree(ui->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) ui->data = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) inode->i_size = ui->ui_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) old_size = ui->data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) ui->data_len = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) mutex_unlock(&ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) mutex_lock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) host->i_ctime = current_time(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) host_ui->xattr_size -= CALC_XATTR_BYTES(old_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) host_ui->xattr_size += CALC_XATTR_BYTES(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) * It is important to write the host inode after the xattr inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) * because if the host inode gets synchronized (via 'fsync()'), then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) * the extended attribute inode gets synchronized, because it goes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) * before the host inode in the write-buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) err = ubifs_jnl_change_xattr(c, inode, host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) goto out_cancel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) out_cancel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) host_ui->xattr_size -= CALC_XATTR_BYTES(size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) host_ui->xattr_size += CALC_XATTR_BYTES(old_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) make_bad_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) inode = ubifs_iget(c->vfs_sb, inum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) ubifs_err(c, "dead extended attribute entry, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) (int)PTR_ERR(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (ubifs_inode(inode)->xattr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) return inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ubifs_err(c, "corrupt extended attribute entry");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int ubifs_xattr_set(struct inode *host, const char *name, const void *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) size_t size, int flags, bool check_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) struct ubifs_info *c = host->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) struct ubifs_dent_node *xent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (check_lock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) ubifs_assert(c, inode_is_locked(host));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) if (size > UBIFS_MAX_INO_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (fname_len(&nm) > UBIFS_MAX_NLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) if (!xent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) down_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * The extended attribute entries are stored in LNC, so multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * look-ups do not involve reading the flash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) xent_key_init(c, &key, host->i_ino, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) if (err != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (flags & XATTR_REPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /* We are asked not to create the xattr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) err = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) err = create_xattr(c, host, &nm, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (flags & XATTR_CREATE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* We are asked not to replace the xattr */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) err = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) inode = iget_xattr(c, le64_to_cpu(xent->inum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) err = change_xattr(c, host, inode, value, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) up_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) kfree(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) struct ubifs_info *c = host->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) struct ubifs_inode *ui;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) struct ubifs_dent_node *xent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (fname_len(&nm) > UBIFS_MAX_NLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) if (!xent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) down_read(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) xent_key_init(c, &key, host->i_ino, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) err = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) inode = iget_xattr(c, le64_to_cpu(xent->inum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) goto out_cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) ui = ubifs_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) ubifs_assert(c, inode->i_size == ui->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) ubifs_assert(c, ubifs_inode(host)->xattr_size > ui->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) mutex_lock(&ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /* If @buf is %NULL we are supposed to return the length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (ui->data_len > size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) err = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) goto out_iput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) memcpy(buf, ui->data, ui->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) err = ui->data_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) out_iput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) mutex_unlock(&ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) out_cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) up_read(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) kfree(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static bool xattr_visible(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) /* File encryption related xattrs are for internal use only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /* Show trusted namespace only for "power" users */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (strncmp(name, XATTR_TRUSTED_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) XATTR_TRUSTED_PREFIX_LEN) == 0 && !capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct inode *host = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct ubifs_info *c = host->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct ubifs_inode *host_ui = ubifs_inode(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct ubifs_dent_node *xent, *pxent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) int err, len, written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) struct fscrypt_name nm = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dbg_gen("ino %lu ('%pd'), buffer size %zd", host->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) dentry, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) down_read(&host_ui->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) len = host_ui->xattr_names + host_ui->xattr_cnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (!buffer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * We should return the minimum buffer size which will fit a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * null-terminated list of all the extended attribute names.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) err = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (len > size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) err = -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) lowest_xent_key(c, &key, host->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) xent = ubifs_tnc_next_ent(c, &key, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (IS_ERR(xent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) err = PTR_ERR(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) fname_name(&nm) = xent->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) fname_len(&nm) = le16_to_cpu(xent->nlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) if (xattr_visible(xent->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) memcpy(buffer + written, fname_name(&nm), fname_len(&nm) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) written += fname_len(&nm) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) pxent = xent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) key_read(c, &xent->key, &key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) up_read(&host_ui->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (err != -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) ubifs_err(c, "cannot find next direntry, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) ubifs_assert(c, written <= size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) up_read(&host_ui->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) static int remove_xattr(struct ubifs_info *c, struct inode *host,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct inode *inode, const struct fscrypt_name *nm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) struct ubifs_inode *host_ui = ubifs_inode(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) struct ubifs_inode *ui = ubifs_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) .dirtied_ino_d = ALIGN(host_ui->data_len, 8) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) ubifs_assert(c, ui->data_len == inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) err = ubifs_budget_space(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) mutex_lock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) host->i_ctime = current_time(host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) host_ui->xattr_cnt -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) host_ui->xattr_names -= fname_len(nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) err = ubifs_jnl_delete_xattr(c, host, inode, nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) goto out_cancel;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) out_cancel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) host_ui->xattr_cnt += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) host_ui->xattr_names += fname_len(nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) mutex_unlock(&host_ui->ui_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) ubifs_release_budget(c, &req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) make_bad_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) int ubifs_purge_xattrs(struct inode *host)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct ubifs_info *c = host->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) struct ubifs_dent_node *xent, *pxent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) struct inode *xino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct fscrypt_name nm = {0};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) if (ubifs_inode(host)->xattr_cnt <= ubifs_xattr_max_cnt(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) ubifs_warn(c, "inode %lu has too many xattrs, doing a non-atomic deletion",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) host->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) down_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) lowest_xent_key(c, &key, host->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) xent = ubifs_tnc_next_ent(c, &key, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (IS_ERR(xent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) err = PTR_ERR(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) fname_name(&nm) = xent->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) fname_len(&nm) = le16_to_cpu(xent->nlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (IS_ERR(xino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) err = PTR_ERR(xino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) ubifs_err(c, "dead directory entry '%s', error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) xent->name, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) ubifs_ro_mode(c, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) kfree(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) ubifs_assert(c, ubifs_inode(xino)->xattr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) clear_nlink(xino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) err = remove_xattr(c, host, xino, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) kfree(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) iput(xino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) ubifs_err(c, "cannot remove xattr, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) iput(xino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) pxent = xent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) key_read(c, &xent->key, &key);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) kfree(pxent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) up_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) if (err != -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) ubifs_err(c, "cannot find next direntry, error %d", err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) up_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * ubifs_evict_xattr_inode - Evict an xattr inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * @c: UBIFS file-system description object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) * @xattr_inum: xattr inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * When an inode that hosts xattrs is being removed we have to make sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * that cached inodes of the xattrs also get removed from the inode cache
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * otherwise we'd waste memory. This function looks up an inode from the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) * inode cache and clears the link counter such that iput() will evict
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) * the inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) inode = ilookup(c->vfs_sb, xattr_inum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) static int ubifs_xattr_remove(struct inode *host, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) struct ubifs_info *c = host->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) struct ubifs_dent_node *xent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) union ubifs_key key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) ubifs_assert(c, inode_is_locked(host));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if (fname_len(&nm) > UBIFS_MAX_NLEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if (!xent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) down_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) xent_key_init(c, &key, host->i_ino, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) err = ubifs_tnc_lookup_nm(c, &key, xent, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) err = -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) inode = iget_xattr(c, le64_to_cpu(xent->inum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) goto out_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) ubifs_assert(c, inode->i_nlink == 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) err = remove_xattr(c, host, inode, &nm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) set_nlink(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) /* If @i_nlink is 0, 'iput()' will delete the inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) out_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) up_write(&ubifs_inode(host)->xattr_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) kfree(xent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) #ifdef CONFIG_UBIFS_FS_SECURITY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) static int init_xattrs(struct inode *inode, const struct xattr *xattr_array,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) void *fs_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) const struct xattr *xattr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) for (xattr = xattr_array; xattr->name != NULL; xattr++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) name = kmalloc(XATTR_SECURITY_PREFIX_LEN +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) strlen(xattr->name) + 1, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) if (!name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) strcpy(name, XATTR_SECURITY_PREFIX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * creating a new inode without holding the inode rwsem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * no need to check whether inode is locked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) err = ubifs_xattr_set(inode, name, xattr->value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) xattr->value_len, 0, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) int ubifs_init_security(struct inode *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) const struct qstr *qstr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) err = security_inode_init_security(inode, dentry, qstr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) &init_xattrs, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) struct ubifs_info *c = dentry->i_sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) ubifs_err(c, "cannot initialize security for inode %lu, error %d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) inode->i_ino, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) static int xattr_get(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) const char *name, void *buffer, size_t size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) inode->i_ino, dentry, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) name = xattr_full_name(handler, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) return ubifs_xattr_get(inode, name, buffer, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) static int xattr_set(const struct xattr_handler *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) struct dentry *dentry, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) const char *name, const void *value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) size_t size, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) name, inode->i_ino, dentry, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) name = xattr_full_name(handler, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) if (value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) return ubifs_xattr_set(inode, name, value, size, flags, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) return ubifs_xattr_remove(inode, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) static const struct xattr_handler ubifs_user_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) .prefix = XATTR_USER_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) .get = xattr_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) .set = xattr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) static const struct xattr_handler ubifs_trusted_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) .prefix = XATTR_TRUSTED_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) .get = xattr_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) .set = xattr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) #ifdef CONFIG_UBIFS_FS_SECURITY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) static const struct xattr_handler ubifs_security_xattr_handler = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) .prefix = XATTR_SECURITY_PREFIX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) .get = xattr_get,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) .set = xattr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) const struct xattr_handler *ubifs_xattr_handlers[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) &ubifs_user_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) &ubifs_trusted_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) #ifdef CONFIG_UBIFS_FS_SECURITY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) &ubifs_security_xattr_handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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