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Dave Chinner0b61f8a2018-06-05 19:42:14 -07001// SPDX-License-Identifier: GPL-2.0
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +10002/*
3 * Copyright (C) 2008 Christoph Hellwig.
4 * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc.
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +10005 */
6
7#include "xfs.h"
Darrick J. Wong5467b342019-06-28 19:25:35 -07008#include "xfs_shared.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +11009#include "xfs_format.h"
Dave Chinner69432832013-08-12 20:49:23 +100010#include "xfs_log_format.h"
Dave Chinner57062782013-10-15 09:17:51 +110011#include "xfs_da_format.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100012#include "xfs_inode.h"
13#include "xfs_attr.h"
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100014
15#include <linux/posix_acl_xattr.h>
16#include <linux/xattr.h>
17
18
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100019static int
Al Virob2968212016-04-10 20:48:24 -040020xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
21 struct inode *inode, const char *name, void *value, size_t size)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100022{
Andreas Gruenbacherd9a82a02015-10-04 19:18:51 +020023 int xflags = handler->flags;
Al Virob2968212016-04-10 20:48:24 -040024 struct xfs_inode *ip = XFS_I(inode);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100025 int error, asize = size;
26
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100027 /* Convert Linux syscall to XFS internal ATTR flags */
28 if (!size) {
29 xflags |= ATTR_KERNOVAL;
30 value = NULL;
31 }
32
Dave Chinnerddbca702019-08-29 09:04:10 -070033 error = xfs_attr_get(ip, name, (unsigned char **)&value, &asize, xflags);
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100034 if (error)
35 return error;
36 return asize;
37}
38
Andreas Gruenbacher47e1bf62015-11-03 12:56:17 +110039void
40xfs_forget_acl(
41 struct inode *inode,
42 const char *name,
43 int xflags)
44{
45 /*
46 * Invalidate any cached ACLs if the user has bypassed the ACL
47 * interface. We don't validate the content whatsoever so it is caller
48 * responsibility to provide data in valid format and ensure i_mode is
49 * consistent.
50 */
51 if (xflags & ATTR_ROOT) {
52#ifdef CONFIG_XFS_POSIX_ACL
53 if (!strcmp(name, SGI_ACL_FILE))
54 forget_cached_acl(inode, ACL_TYPE_ACCESS);
55 else if (!strcmp(name, SGI_ACL_DEFAULT))
56 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
57#endif
58 }
59}
60
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100061static int
Al Viro59301222016-05-27 10:19:30 -040062xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused,
63 struct inode *inode, const char *name, const void *value,
64 size_t size, int flags)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100065{
Linus Torvalds5d2eb542015-11-13 18:02:30 -080066 int xflags = handler->flags;
Al Viro59301222016-05-27 10:19:30 -040067 struct xfs_inode *ip = XFS_I(inode);
Brian Foster67d8e042015-11-03 12:40:59 +110068 int error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100069
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100070 /* Convert Linux syscall to XFS internal ATTR flags */
71 if (flags & XATTR_CREATE)
72 xflags |= ATTR_CREATE;
73 if (flags & XATTR_REPLACE)
74 xflags |= ATTR_REPLACE;
75
76 if (!value)
Dave Chinner24513372014-06-25 14:58:08 +100077 return xfs_attr_remove(ip, (unsigned char *)name, xflags);
Brian Foster67d8e042015-11-03 12:40:59 +110078 error = xfs_attr_set(ip, (unsigned char *)name,
Dave Chinnera9273ca2010-01-20 10:47:48 +110079 (void *)value, size, xflags);
Andreas Gruenbacher47e1bf62015-11-03 12:56:17 +110080 if (!error)
Al Viro59301222016-05-27 10:19:30 -040081 xfs_forget_acl(inode, name, xflags);
Brian Foster67d8e042015-11-03 12:40:59 +110082
83 return error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100084}
85
Stephen Hemminger46e58762010-05-13 17:53:20 -070086static const struct xattr_handler xfs_xattr_user_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100087 .prefix = XATTR_USER_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000088 .flags = 0, /* no flags implies user namespace */
89 .get = xfs_xattr_get,
90 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100091};
92
Stephen Hemminger46e58762010-05-13 17:53:20 -070093static const struct xattr_handler xfs_xattr_trusted_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100094 .prefix = XATTR_TRUSTED_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +000095 .flags = ATTR_ROOT,
96 .get = xfs_xattr_get,
97 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +100098};
99
Stephen Hemminger46e58762010-05-13 17:53:20 -0700100static const struct xattr_handler xfs_xattr_security_handler = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000101 .prefix = XATTR_SECURITY_PREFIX,
Christoph Hellwig431547b2009-11-13 09:52:56 +0000102 .flags = ATTR_SECURE,
103 .get = xfs_xattr_get,
104 .set = xfs_xattr_set,
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000105};
106
Stephen Hemminger46e58762010-05-13 17:53:20 -0700107const struct xattr_handler *xfs_xattr_handlers[] = {
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000108 &xfs_xattr_user_handler,
109 &xfs_xattr_trusted_handler,
110 &xfs_xattr_security_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200111#ifdef CONFIG_XFS_POSIX_ACL
Christoph Hellwig2401dc22013-12-20 05:16:50 -0800112 &posix_acl_access_xattr_handler,
113 &posix_acl_default_xattr_handler,
Christoph Hellwigef14f0c2009-06-10 17:07:47 +0200114#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000115 NULL
116};
117
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100118static void
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100119__xfs_xattr_put_listent(
120 struct xfs_attr_list_context *context,
121 char *prefix,
122 int prefix_len,
123 unsigned char *name,
124 int namelen)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000125{
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100126 char *offset;
127 int arraytop;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000128
Darrick J. Wong3b500862019-02-13 11:15:17 -0800129 if (context->count < 0 || context->seen_enough)
130 return;
131
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100132 if (!context->alist)
133 goto compute_size;
134
135 arraytop = context->count + prefix_len + namelen + 1;
136 if (arraytop > context->firstu) {
137 context->count = -1; /* insufficient space */
Artem Savkov791cc432016-09-14 07:40:35 +1000138 context->seen_enough = 1;
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100139 return;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100140 }
141 offset = (char *)context->alist + context->count;
142 strncpy(offset, prefix, prefix_len);
143 offset += prefix_len;
144 strncpy(offset, (char *)name, namelen); /* real name */
145 offset += namelen;
146 *offset = '\0';
147
148compute_size:
149 context->count += prefix_len + namelen + 1;
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100150 return;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000151}
152
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100153static void
Dave Chinnera9273ca2010-01-20 10:47:48 +1100154xfs_xattr_put_listent(
155 struct xfs_attr_list_context *context,
156 int flags,
157 unsigned char *name,
158 int namelen,
Eric Sandeene5bd12b2016-04-06 07:57:32 +1000159 int valuelen)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000160{
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100161 char *prefix;
162 int prefix_len;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000163
164 ASSERT(context->count >= 0);
165
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100166 if (flags & XFS_ATTR_ROOT) {
167#ifdef CONFIG_XFS_POSIX_ACL
168 if (namelen == SGI_ACL_FILE_SIZE &&
169 strncmp(name, SGI_ACL_FILE,
170 SGI_ACL_FILE_SIZE) == 0) {
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100171 __xfs_xattr_put_listent(
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100172 context, XATTR_SYSTEM_PREFIX,
173 XATTR_SYSTEM_PREFIX_LEN,
174 XATTR_POSIX_ACL_ACCESS,
175 strlen(XATTR_POSIX_ACL_ACCESS));
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100176 } else if (namelen == SGI_ACL_DEFAULT_SIZE &&
177 strncmp(name, SGI_ACL_DEFAULT,
178 SGI_ACL_DEFAULT_SIZE) == 0) {
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100179 __xfs_xattr_put_listent(
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100180 context, XATTR_SYSTEM_PREFIX,
181 XATTR_SYSTEM_PREFIX_LEN,
182 XATTR_POSIX_ACL_DEFAULT,
183 strlen(XATTR_POSIX_ACL_DEFAULT));
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100184 }
185#endif
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000186
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100187 /*
188 * Only show root namespace entries if we are actually allowed to
189 * see them.
190 */
191 if (!capable(CAP_SYS_ADMIN))
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100192 return;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100193
194 prefix = XATTR_TRUSTED_PREFIX;
195 prefix_len = XATTR_TRUSTED_PREFIX_LEN;
196 } else if (flags & XFS_ATTR_SECURE) {
197 prefix = XATTR_SECURITY_PREFIX;
198 prefix_len = XATTR_SECURITY_PREFIX_LEN;
199 } else {
200 prefix = XATTR_USER_PREFIX;
201 prefix_len = XATTR_USER_PREFIX_LEN;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000202 }
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000203
Eric Sandeenf7a136a2016-12-05 12:32:14 +1100204 __xfs_xattr_put_listent(context, prefix, prefix_len, name,
205 namelen);
206 return;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000207}
208
209ssize_t
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000210xfs_vn_listxattr(
211 struct dentry *dentry,
212 char *data,
213 size_t size)
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000214{
215 struct xfs_attr_list_context context;
216 struct attrlist_cursor_kern cursor = { 0 };
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000217 struct inode *inode = d_inode(dentry);
218 int error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000219
220 /*
221 * First read the regular on-disk attributes.
222 */
223 memset(&context, 0, sizeof(context));
224 context.dp = XFS_I(inode);
225 context.cursor = &cursor;
226 context.resynch = 1;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100227 context.alist = size ? data : NULL;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000228 context.bufsize = size;
229 context.firstu = context.bufsize;
Andreas Gruenbacher5d92b752015-12-02 14:44:40 +0100230 context.put_listent = xfs_xattr_put_listent;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000231
Eric Sandeen2a6fba62016-04-06 07:57:18 +1000232 error = xfs_attr_list_int(&context);
233 if (error)
234 return error;
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000235 if (context.count < 0)
236 return -ERANGE;
237
Lachlan McIlroyf9e09f02008-06-23 13:34:09 +1000238 return context.count;
239}