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288 lines
6.2 KiB
288 lines
6.2 KiB
// 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 "xfs_da_format.h" |
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#include "xfs_da_btree.h" |
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#include "xfs_trans.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 = make_kuid(&init_user_ns, |
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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 = make_kgid(&init_user_ns, |
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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( |
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from_kuid(&init_user_ns, 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( |
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from_kgid(&init_user_ns, 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 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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.attr_filter = XFS_ATTR_ROOT, |
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.valuelen = XFS_ACL_MAX_SIZE(mp), |
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}; |
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int error; |
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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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args.name = SGI_ACL_FILE; |
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break; |
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case ACL_TYPE_DEFAULT: |
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args.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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args.namelen = strlen(args.name); |
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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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error = xfs_attr_get(&args); |
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if (!error) { |
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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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} else if (error != -ENOATTR) { |
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acl = ERR_PTR(error); |
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} |
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kmem_free(args.value); |
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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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struct xfs_da_args args = { |
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.dp = ip, |
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.attr_filter = XFS_ATTR_ROOT, |
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}; |
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int error; |
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switch (type) { |
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case ACL_TYPE_ACCESS: |
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args.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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args.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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args.namelen = strlen(args.name); |
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if (acl) { |
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args.valuelen = XFS_ACL_SIZE(acl->a_count); |
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args.value = kvzalloc(args.valuelen, GFP_KERNEL); |
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if (!args.value) |
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return -ENOMEM; |
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xfs_acl_to_disk(args.value, acl); |
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} |
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error = xfs_attr_set(&args); |
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kmem_free(args.value); |
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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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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_acl_set_mode( |
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struct inode *inode, |
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umode_t mode) |
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{ |
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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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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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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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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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} |
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int |
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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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{ |
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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(mnt_userns, 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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/* |
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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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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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return error; |
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} |
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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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