4 * Copyright (C) 1991, 1992 Linus Torvalds
5 * changes by Thomas Schoebel-Theuer
8 #include <linux/module.h>
9 #include <linux/time.h>
11 #include <linux/string.h>
12 #include <linux/smp_lock.h>
13 #include <linux/dnotify.h>
14 #include <linux/fcntl.h>
15 #include <linux/quotaops.h>
16 #include <linux/security.h>
17 #include <linux/vs_base.h>
18 #include <linux/proc_fs.h>
19 #include <linux/devpts_fs.h>
21 /* Taken over from the old code... */
23 /* POSIX UID/GID verification for setting inode attributes. */
24 int inode_change_ok(struct inode *inode, struct iattr *attr)
27 unsigned int ia_valid = attr->ia_valid;
29 /* If force is set do it anyway. */
30 if (ia_valid & ATTR_FORCE)
33 /* Make sure a caller can chown. */
34 if ((ia_valid & ATTR_UID) &&
35 (current->fsuid != inode->i_uid ||
36 attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
39 /* Make sure caller can chgrp. */
40 if ((ia_valid & ATTR_GID) &&
41 (current->fsuid != inode->i_uid ||
42 (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
46 /* Make sure a caller can chmod. */
47 if (ia_valid & ATTR_MODE) {
48 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
50 /* Also check the setgid bit! */
51 if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
52 inode->i_gid) && !capable(CAP_FSETID))
53 attr->ia_mode &= ~S_ISGID;
56 /* Check for setting the inode time. */
57 if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
58 if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
62 /* Check for evil vserver activity */
63 if (vx_check(0, VX_ADMIN))
66 if (IS_BARRIER(inode)) {
68 "VSW: xid=%d messing with the barrier.\n",
72 switch (inode->i_sb->s_magic) {
73 case PROC_SUPER_MAGIC:
75 "VSW: xid=%d messing with the procfs.\n",
78 case DEVPTS_SUPER_MAGIC:
79 if (vx_check(inode->i_xid, VX_IDENT))
82 "VSW: xid=%d messing with the devpts.\n",
92 EXPORT_SYMBOL(inode_change_ok);
94 int inode_setattr_flags(struct inode *inode, unsigned int flags)
96 unsigned int oldflags, newflags;
98 oldflags = inode->i_flags;
99 newflags = oldflags & ~(S_IMMUTABLE | S_IUNLINK | S_BARRIER);
100 if (flags & ATTR_FLAG_IMMUTABLE)
101 newflags |= S_IMMUTABLE;
102 if (flags & ATTR_FLAG_IUNLINK)
103 newflags |= S_IUNLINK;
104 if (flags & ATTR_FLAG_BARRIER)
105 newflags |= S_BARRIER;
107 if (oldflags ^ newflags)
108 inode->i_flags = newflags;
112 int inode_setattr(struct inode * inode, struct iattr * attr)
114 unsigned int ia_valid = attr->ia_valid;
117 if (ia_valid & ATTR_SIZE) {
118 if (attr->ia_size != i_size_read(inode)) {
119 error = vmtruncate(inode, attr->ia_size);
120 if (error || (ia_valid == ATTR_SIZE))
124 * We skipped the truncate but must still update
127 ia_valid |= ATTR_MTIME|ATTR_CTIME;
131 if (ia_valid & ATTR_UID)
132 inode->i_uid = attr->ia_uid;
133 if (ia_valid & ATTR_GID)
134 inode->i_gid = attr->ia_gid;
135 if (ia_valid & ATTR_XID)
136 inode->i_xid = attr->ia_xid;
137 if (ia_valid & ATTR_ATIME)
138 inode->i_atime = attr->ia_atime;
139 if (ia_valid & ATTR_MTIME)
140 inode->i_mtime = attr->ia_mtime;
141 if (ia_valid & ATTR_CTIME)
142 inode->i_ctime = attr->ia_ctime;
143 if (ia_valid & ATTR_MODE) {
144 umode_t mode = attr->ia_mode;
146 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
148 inode->i_mode = mode;
150 if (ia_valid & ATTR_ATTR_FLAG)
151 inode_setattr_flags(inode, attr->ia_attr_flags);
152 mark_inode_dirty(inode);
157 EXPORT_SYMBOL(inode_setattr);
159 int setattr_mask(unsigned int ia_valid)
161 unsigned long dn_mask = 0;
163 if (ia_valid & ATTR_UID)
164 dn_mask |= DN_ATTRIB;
165 if (ia_valid & ATTR_GID)
166 dn_mask |= DN_ATTRIB;
167 if (ia_valid & ATTR_XID)
168 dn_mask |= DN_ATTRIB;
169 if (ia_valid & ATTR_SIZE)
170 dn_mask |= DN_MODIFY;
171 /* both times implies a utime(s) call */
172 if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
173 dn_mask |= DN_ATTRIB;
174 else if (ia_valid & ATTR_ATIME)
175 dn_mask |= DN_ACCESS;
176 else if (ia_valid & ATTR_MTIME)
177 dn_mask |= DN_MODIFY;
178 if (ia_valid & ATTR_MODE)
179 dn_mask |= DN_ATTRIB;
183 int notify_change(struct dentry * dentry, struct iattr * attr)
185 struct inode *inode = dentry->d_inode;
186 mode_t mode = inode->i_mode;
188 struct timespec now = CURRENT_TIME;
189 unsigned int ia_valid = attr->ia_valid;
194 attr->ia_ctime = now;
195 if (!(ia_valid & ATTR_ATIME_SET))
196 attr->ia_atime = now;
197 if (!(ia_valid & ATTR_MTIME_SET))
198 attr->ia_mtime = now;
199 if (ia_valid & ATTR_KILL_SUID) {
200 attr->ia_valid &= ~ATTR_KILL_SUID;
201 if (mode & S_ISUID) {
202 if (!(ia_valid & ATTR_MODE)) {
203 ia_valid = attr->ia_valid |= ATTR_MODE;
204 attr->ia_mode = inode->i_mode;
206 attr->ia_mode &= ~S_ISUID;
209 if (ia_valid & ATTR_KILL_SGID) {
210 attr->ia_valid &= ~ ATTR_KILL_SGID;
211 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
212 if (!(ia_valid & ATTR_MODE)) {
213 ia_valid = attr->ia_valid |= ATTR_MODE;
214 attr->ia_mode = inode->i_mode;
216 attr->ia_mode &= ~S_ISGID;
222 if (inode->i_op && inode->i_op->setattr) {
223 error = security_inode_setattr(dentry, attr);
225 error = inode->i_op->setattr(dentry, attr);
227 error = inode_change_ok(inode, attr);
229 error = security_inode_setattr(dentry, attr);
231 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
232 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid) ||
233 (ia_valid & ATTR_XID && attr->ia_xid != inode->i_xid))
234 error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
236 error = inode_setattr(inode, attr);
240 unsigned long dn_mask = setattr_mask(ia_valid);
242 dnotify_parent(dentry, dn_mask);
247 EXPORT_SYMBOL(notify_change);