2018-06-06 02:42:14 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2009-06-10 15:07:47 +00:00
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/*
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* Copyright (c) 2008, Christoph Hellwig
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* All Rights Reserved.
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*/
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#include "xfs.h"
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2019-06-29 02:25:35 +00:00
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#include "xfs_shared.h"
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2013-10-22 23:51:50 +00:00
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#include "xfs_format.h"
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2013-08-12 10:49:23 +00:00
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#include "xfs_log_format.h"
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2013-08-12 10:49:32 +00:00
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#include "xfs_trans_resv.h"
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2013-06-05 02:09:10 +00:00
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#include "xfs_mount.h"
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2013-10-22 23:51:50 +00:00
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#include "xfs_inode.h"
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#include "xfs_attr.h"
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2009-12-14 23:14:59 +00:00
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#include "xfs_trace.h"
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2019-11-02 16:40:53 +00:00
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#include "xfs_error.h"
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2019-11-07 01:19:33 +00:00
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#include "xfs_acl.h"
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2020-02-27 01:30:33 +00:00
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#include "xfs_da_format.h"
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#include "xfs_da_btree.h"
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2020-12-11 04:00:39 +00:00
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#include "xfs_trans.h"
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2009-06-10 15:07:47 +00:00
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2019-11-07 01:19:33 +00:00
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#include <linux/posix_acl_xattr.h>
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2009-06-10 15:07:47 +00:00
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/*
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* Locking scheme:
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* - all ACL updates are protected by inode->i_mutex, which is taken before
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* calling into this file.
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*/
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STATIC struct posix_acl *
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2013-06-05 02:09:10 +00:00
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xfs_acl_from_disk(
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2019-11-02 16:40:53 +00:00
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struct xfs_mount *mp,
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2015-11-03 01:41:59 +00:00
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const struct xfs_acl *aclp,
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int len,
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int max_entries)
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2009-06-10 15:07:47 +00:00
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{
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struct posix_acl_entry *acl_e;
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struct posix_acl *acl;
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2015-11-03 01:41:59 +00:00
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const struct xfs_acl_entry *ace;
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2011-12-12 21:55:52 +00:00
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unsigned int count, i;
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2009-06-10 15:07:47 +00:00
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2019-11-02 16:40:53 +00:00
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if (len < sizeof(*aclp)) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, aclp,
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len);
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2015-11-03 01:41:59 +00:00
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return ERR_PTR(-EFSCORRUPTED);
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2019-11-02 16:40:53 +00:00
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}
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2009-06-10 15:07:47 +00:00
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count = be32_to_cpu(aclp->acl_cnt);
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2019-11-02 16:40:53 +00:00
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if (count > max_entries || XFS_ACL_SIZE(count) != len) {
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XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, aclp,
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len);
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2011-11-20 15:35:32 +00:00
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return ERR_PTR(-EFSCORRUPTED);
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2019-11-02 16:40:53 +00:00
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}
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2009-06-10 15:07:47 +00:00
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acl = posix_acl_alloc(count, GFP_KERNEL);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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for (i = 0; i < count; i++) {
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acl_e = &acl->a_entries[i];
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ace = &aclp->acl_entry[i];
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/*
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* The tag is 32 bits on disk and 16 bits in core.
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*
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* Because every access to it goes through the core
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* format first this is not a problem.
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*/
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acl_e->e_tag = be32_to_cpu(ace->ae_tag);
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acl_e->e_perm = be16_to_cpu(ace->ae_perm);
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switch (acl_e->e_tag) {
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case ACL_USER:
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2020-02-21 16:31:27 +00:00
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acl_e->e_uid = make_kuid(&init_user_ns,
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be32_to_cpu(ace->ae_id));
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2013-08-15 18:07:59 +00:00
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break;
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2009-06-10 15:07:47 +00:00
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case ACL_GROUP:
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2020-02-21 16:31:27 +00:00
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acl_e->e_gid = make_kgid(&init_user_ns,
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be32_to_cpu(ace->ae_id));
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2009-06-10 15:07:47 +00:00
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break;
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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break;
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default:
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goto fail;
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}
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}
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return acl;
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fail:
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posix_acl_release(acl);
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return ERR_PTR(-EINVAL);
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}
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STATIC void
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xfs_acl_to_disk(struct xfs_acl *aclp, const struct posix_acl *acl)
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{
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const struct posix_acl_entry *acl_e;
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struct xfs_acl_entry *ace;
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int i;
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aclp->acl_cnt = cpu_to_be32(acl->a_count);
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for (i = 0; i < acl->a_count; i++) {
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ace = &aclp->acl_entry[i];
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acl_e = &acl->a_entries[i];
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ace->ae_tag = cpu_to_be32(acl_e->e_tag);
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2013-08-15 18:07:59 +00:00
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switch (acl_e->e_tag) {
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case ACL_USER:
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2020-02-21 16:31:27 +00:00
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ace->ae_id = cpu_to_be32(
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from_kuid(&init_user_ns, acl_e->e_uid));
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2013-08-15 18:07:59 +00:00
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break;
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case ACL_GROUP:
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2020-02-21 16:31:27 +00:00
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ace->ae_id = cpu_to_be32(
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from_kgid(&init_user_ns, acl_e->e_gid));
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2013-08-15 18:07:59 +00:00
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break;
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default:
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ace->ae_id = cpu_to_be32(ACL_UNDEFINED_ID);
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break;
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}
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2009-06-10 15:07:47 +00:00
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ace->ae_perm = cpu_to_be16(acl_e->e_perm);
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}
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}
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struct posix_acl *
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xfs_get_acl(struct inode *inode, int type)
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{
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2020-02-27 01:30:34 +00:00
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct posix_acl *acl = NULL;
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struct xfs_da_args args = {
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.dp = ip,
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2020-02-27 01:30:42 +00:00
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.attr_filter = XFS_ATTR_ROOT,
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2020-02-27 01:30:34 +00:00
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.valuelen = XFS_ACL_MAX_SIZE(mp),
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};
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int error;
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2009-06-10 15:07:47 +00:00
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2011-07-23 15:37:31 +00:00
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trace_xfs_get_acl(ip);
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2009-06-10 15:07:47 +00:00
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switch (type) {
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case ACL_TYPE_ACCESS:
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2020-02-27 01:30:34 +00:00
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args.name = SGI_ACL_FILE;
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2009-06-10 15:07:47 +00:00
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break;
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case ACL_TYPE_DEFAULT:
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2020-02-27 01:30:34 +00:00
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args.name = SGI_ACL_DEFAULT;
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2009-06-10 15:07:47 +00:00
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break;
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default:
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2009-06-09 17:29:39 +00:00
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BUG();
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2009-06-10 15:07:47 +00:00
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}
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2020-02-27 01:30:34 +00:00
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args.namelen = strlen(args.name);
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2009-06-10 15:07:47 +00:00
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2020-02-27 01:30:35 +00:00
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/*
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* If the attribute doesn't exist make sure we have a negative cache
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* entry, for any other error assume it is transient.
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*/
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2020-02-27 01:30:34 +00:00
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error = xfs_attr_get(&args);
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2020-02-27 01:30:35 +00:00
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if (!error) {
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2020-02-27 01:30:34 +00:00
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acl = xfs_acl_from_disk(mp, args.value, args.valuelen,
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XFS_ACL_MAX_ENTRIES(mp));
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2020-02-27 01:30:35 +00:00
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} else if (error != -ENOATTR) {
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acl = ERR_PTR(error);
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2009-06-10 15:07:47 +00:00
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}
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2020-02-27 01:30:35 +00:00
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kmem_free(args.value);
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2009-06-10 15:07:47 +00:00
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return acl;
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}
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2017-06-26 15:48:18 +00:00
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int
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__xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
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2009-06-10 15:07:47 +00:00
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{
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2020-02-27 01:30:33 +00:00
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_da_args args = {
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.dp = ip,
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2020-02-27 01:30:42 +00:00
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.attr_filter = XFS_ATTR_ROOT,
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2020-02-27 01:30:33 +00:00
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};
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int error;
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2009-06-10 15:07:47 +00:00
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switch (type) {
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case ACL_TYPE_ACCESS:
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2020-02-27 01:30:33 +00:00
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args.name = SGI_ACL_FILE;
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2009-06-10 15:07:47 +00:00
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break;
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case ACL_TYPE_DEFAULT:
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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2020-02-27 01:30:33 +00:00
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args.name = SGI_ACL_DEFAULT;
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2009-06-10 15:07:47 +00:00
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break;
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default:
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return -EINVAL;
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}
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2020-02-27 01:30:33 +00:00
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args.namelen = strlen(args.name);
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2009-06-10 15:07:47 +00:00
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if (acl) {
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2020-02-27 01:30:44 +00:00
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args.valuelen = XFS_ACL_SIZE(acl->a_count);
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2020-09-01 18:47:12 +00:00
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args.value = kvzalloc(args.valuelen, GFP_KERNEL);
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2020-02-27 01:30:33 +00:00
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if (!args.value)
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2013-09-02 10:53:00 +00:00
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return -ENOMEM;
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2020-02-27 01:30:33 +00:00
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xfs_acl_to_disk(args.value, acl);
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2009-06-10 15:07:47 +00:00
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}
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2020-02-27 01:30:33 +00:00
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error = xfs_attr_set(&args);
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kmem_free(args.value);
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2020-02-27 01:30:29 +00:00
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/*
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* If the attribute didn't exist to start with that's fine.
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*/
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if (!acl && error == -ENOATTR)
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error = 0;
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2009-06-10 15:07:47 +00:00
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if (!error)
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2009-06-09 17:29:39 +00:00
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set_cached_acl(inode, type, acl);
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2009-06-10 15:07:47 +00:00
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return error;
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}
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static int
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2020-12-11 04:00:39 +00:00
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xfs_acl_set_mode(
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struct inode *inode,
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umode_t mode)
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2009-06-10 15:07:47 +00:00
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{
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2020-12-11 04:00:39 +00:00
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_trans *tp;
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int error;
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2009-06-10 15:07:47 +00:00
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2020-12-11 04:00:39 +00:00
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
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if (error)
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return error;
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2009-06-10 15:07:47 +00:00
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2020-12-11 04:00:39 +00:00
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
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inode->i_mode = mode;
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inode->i_ctime = current_time(inode);
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xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
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2009-06-10 15:07:47 +00:00
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2020-12-11 04:00:39 +00:00
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if (mp->m_flags & XFS_MOUNT_WSYNC)
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xfs_trans_set_sync(tp);
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return xfs_trans_commit(tp);
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2009-06-10 15:07:47 +00:00
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}
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int
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2021-01-21 13:19:43 +00:00
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xfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
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struct posix_acl *acl, int type)
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2009-06-10 15:07:47 +00:00
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{
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2017-10-09 18:37:23 +00:00
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umode_t mode;
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bool set_mode = false;
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2009-11-13 09:52:56 +00:00
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int error = 0;
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2009-06-10 15:07:47 +00:00
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2013-12-20 13:16:50 +00:00
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if (!acl)
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2009-06-10 15:07:47 +00:00
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goto set_acl;
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2014-02-07 04:26:11 +00:00
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error = -E2BIG;
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2013-06-05 02:09:10 +00:00
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if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
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2013-12-20 13:16:50 +00:00
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return error;
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2009-06-10 15:07:47 +00:00
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if (type == ACL_TYPE_ACCESS) {
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2021-01-21 13:19:58 +00:00
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error = posix_acl_update_mode(mnt_userns, inode, &mode, &acl);
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2016-09-19 15:39:09 +00:00
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if (error)
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return error;
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2017-10-09 18:37:23 +00:00
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set_mode = true;
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2009-06-10 15:07:47 +00:00
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}
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set_acl:
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2017-10-09 18:37:23 +00:00
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/*
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* We set the mode after successfully updating the ACL xattr because the
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* xattr update can fail at ENOSPC and we don't want to change the mode
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* if the ACL update hasn't been applied.
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*/
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2020-12-11 04:00:39 +00:00
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error = __xfs_set_acl(inode, acl, type);
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if (!error && set_mode && mode != inode->i_mode)
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error = xfs_acl_set_mode(inode, mode);
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2017-10-09 18:37:23 +00:00
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return error;
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2009-06-10 15:07:47 +00:00
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}
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2020-02-27 01:30:41 +00:00
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/*
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* Invalidate any cached ACLs if the user has bypassed the ACL interface.
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* We don't validate the content whatsoever so it is caller responsibility to
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* provide data in valid format and ensure i_mode is consistent.
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*/
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void
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xfs_forget_acl(
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struct inode *inode,
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const char *name)
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{
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if (!strcmp(name, SGI_ACL_FILE))
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forget_cached_acl(inode, ACL_TYPE_ACCESS);
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else if (!strcmp(name, SGI_ACL_DEFAULT))
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forget_cached_acl(inode, ACL_TYPE_DEFAULT);
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}
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