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d29f781c32
This helps to pre-simplify the extra handling of the null terminator in delayed operations which use memcpy rather than strlen. Later when we introduce parent pointers, attribute names will become binary, so strlen will not work at all. Removing uses of strlen now will help reduce complexities later Signed-off-by: Allison Collins <allison.henderson@oracle.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
278 lines
5.7 KiB
C
278 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_attr.h"
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#include "xfs_trace.h"
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#include "xfs_error.h"
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#include "xfs_acl.h"
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#include <linux/posix_acl_xattr.h>
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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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xfs_acl_from_disk(
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struct xfs_mount *mp,
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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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{
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struct posix_acl_entry *acl_e;
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struct posix_acl *acl;
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const struct xfs_acl_entry *ace;
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unsigned int count, i;
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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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return ERR_PTR(-EFSCORRUPTED);
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}
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count = be32_to_cpu(aclp->acl_cnt);
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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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return ERR_PTR(-EFSCORRUPTED);
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}
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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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acl_e->e_uid = xfs_uid_to_kuid(be32_to_cpu(ace->ae_id));
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break;
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case ACL_GROUP:
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acl_e->e_gid = xfs_gid_to_kgid(be32_to_cpu(ace->ae_id));
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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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switch (acl_e->e_tag) {
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case ACL_USER:
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ace->ae_id = cpu_to_be32(xfs_kuid_to_uid(acl_e->e_uid));
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break;
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case ACL_GROUP:
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ace->ae_id = cpu_to_be32(xfs_kgid_to_gid(acl_e->e_gid));
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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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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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struct xfs_inode *ip = XFS_I(inode);
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struct posix_acl *acl = NULL;
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struct xfs_acl *xfs_acl = NULL;
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unsigned char *ea_name;
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int error;
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int len;
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trace_xfs_get_acl(ip);
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switch (type) {
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case ACL_TYPE_ACCESS:
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ea_name = SGI_ACL_FILE;
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break;
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case ACL_TYPE_DEFAULT:
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ea_name = SGI_ACL_DEFAULT;
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break;
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default:
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BUG();
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}
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/*
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* If we have a cached ACLs value just return it, not need to
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* go out to the disk.
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*/
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len = XFS_ACL_MAX_SIZE(ip->i_mount);
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error = xfs_attr_get(ip, ea_name, strlen(ea_name),
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(unsigned char **)&xfs_acl, &len,
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ATTR_ALLOC | ATTR_ROOT);
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if (error) {
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/*
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* If the attribute doesn't exist make sure we have a negative
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* cache entry, for any other error assume it is transient.
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*/
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if (error != -ENOATTR)
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acl = ERR_PTR(error);
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} else {
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acl = xfs_acl_from_disk(ip->i_mount, xfs_acl, len,
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XFS_ACL_MAX_ENTRIES(ip->i_mount));
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kmem_free(xfs_acl);
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}
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return acl;
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}
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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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{
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struct xfs_inode *ip = XFS_I(inode);
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unsigned char *ea_name;
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int error;
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switch (type) {
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case ACL_TYPE_ACCESS:
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ea_name = SGI_ACL_FILE;
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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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ea_name = SGI_ACL_DEFAULT;
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break;
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default:
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return -EINVAL;
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}
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if (acl) {
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struct xfs_acl *xfs_acl;
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int len = XFS_ACL_MAX_SIZE(ip->i_mount);
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xfs_acl = kmem_zalloc_large(len, 0);
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if (!xfs_acl)
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return -ENOMEM;
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xfs_acl_to_disk(xfs_acl, acl);
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/* subtract away the unused acl entries */
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len -= sizeof(struct xfs_acl_entry) *
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(XFS_ACL_MAX_ENTRIES(ip->i_mount) - acl->a_count);
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error = xfs_attr_set(ip, ea_name, strlen(ea_name),
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(unsigned char *)xfs_acl, len, ATTR_ROOT);
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kmem_free(xfs_acl);
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} else {
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/*
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* A NULL ACL argument means we want to remove the ACL.
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*/
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error = xfs_attr_remove(ip, ea_name,
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strlen(ea_name),
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ATTR_ROOT);
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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 (error == -ENOATTR)
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error = 0;
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}
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if (!error)
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set_cached_acl(inode, type, acl);
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return error;
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}
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static int
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xfs_set_mode(struct inode *inode, umode_t mode)
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{
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int error = 0;
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if (mode != inode->i_mode) {
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struct iattr iattr;
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iattr.ia_valid = ATTR_MODE | ATTR_CTIME;
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iattr.ia_mode = mode;
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iattr.ia_ctime = current_time(inode);
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error = xfs_setattr_nonsize(XFS_I(inode), &iattr, XFS_ATTR_NOACL);
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}
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return error;
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}
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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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{
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umode_t mode;
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bool set_mode = false;
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int error = 0;
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if (!acl)
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goto set_acl;
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error = -E2BIG;
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if (acl->a_count > XFS_ACL_MAX_ENTRIES(XFS_M(inode->i_sb)))
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return error;
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if (type == ACL_TYPE_ACCESS) {
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error = posix_acl_update_mode(inode, &mode, &acl);
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if (error)
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return error;
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set_mode = true;
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}
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set_acl:
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error = __xfs_set_acl(inode, acl, type);
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if (error)
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return error;
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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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if (set_mode)
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error = xfs_set_mode(inode, mode);
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return error;
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}
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