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/proc_fs.h>
18 #include <linux/devpts_fs.h>
19 #include <linux/vserver/debug.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)) {
67 vxwprintk(1, "xid=%d messing with the barrier.",
71 switch (inode->i_sb->s_magic) {
72 case PROC_SUPER_MAGIC:
73 vxwprintk(1, "xid=%d messing with the procfs.",
76 case DEVPTS_SUPER_MAGIC:
77 if (vx_check(inode->i_xid, VX_IDENT))
79 vxwprintk(1, "xid=%d messing with the devpts.",
89 EXPORT_SYMBOL(inode_change_ok);
91 int inode_setattr_flags(struct inode *inode, unsigned int flags)
93 unsigned int oldflags, newflags;
95 oldflags = inode->i_flags;
96 newflags = oldflags & ~(S_IMMUTABLE | S_IUNLINK | S_BARRIER);
97 if (flags & ATTR_FLAG_IMMUTABLE)
98 newflags |= S_IMMUTABLE;
99 if (flags & ATTR_FLAG_IUNLINK)
100 newflags |= S_IUNLINK;
101 if (flags & ATTR_FLAG_BARRIER)
102 newflags |= S_BARRIER;
104 if (oldflags ^ newflags)
105 inode->i_flags = newflags;
109 int inode_setattr(struct inode * inode, struct iattr * attr)
111 unsigned int ia_valid = attr->ia_valid;
114 if (ia_valid & ATTR_SIZE) {
115 if (attr->ia_size != i_size_read(inode)) {
116 error = vmtruncate(inode, attr->ia_size);
117 if (error || (ia_valid == ATTR_SIZE))
121 * We skipped the truncate but must still update
124 ia_valid |= ATTR_MTIME|ATTR_CTIME;
128 if (ia_valid & ATTR_UID)
129 inode->i_uid = attr->ia_uid;
130 if (ia_valid & ATTR_GID)
131 inode->i_gid = attr->ia_gid;
132 if (ia_valid & ATTR_XID)
133 inode->i_xid = attr->ia_xid;
134 if (ia_valid & ATTR_ATIME)
135 inode->i_atime = attr->ia_atime;
136 if (ia_valid & ATTR_MTIME)
137 inode->i_mtime = attr->ia_mtime;
138 if (ia_valid & ATTR_CTIME)
139 inode->i_ctime = attr->ia_ctime;
140 if (ia_valid & ATTR_MODE) {
141 umode_t mode = attr->ia_mode;
143 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
145 inode->i_mode = mode;
147 if (ia_valid & ATTR_ATTR_FLAG)
148 inode_setattr_flags(inode, attr->ia_attr_flags);
149 mark_inode_dirty(inode);
154 EXPORT_SYMBOL(inode_setattr);
156 int setattr_mask(unsigned int ia_valid)
158 unsigned long dn_mask = 0;
160 if (ia_valid & ATTR_UID)
161 dn_mask |= DN_ATTRIB;
162 if (ia_valid & ATTR_GID)
163 dn_mask |= DN_ATTRIB;
164 if (ia_valid & ATTR_XID)
165 dn_mask |= DN_ATTRIB;
166 if (ia_valid & ATTR_SIZE)
167 dn_mask |= DN_MODIFY;
168 /* both times implies a utime(s) call */
169 if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME))
170 dn_mask |= DN_ATTRIB;
171 else if (ia_valid & ATTR_ATIME)
172 dn_mask |= DN_ACCESS;
173 else if (ia_valid & ATTR_MTIME)
174 dn_mask |= DN_MODIFY;
175 if (ia_valid & ATTR_MODE)
176 dn_mask |= DN_ATTRIB;
180 int notify_change(struct dentry * dentry, struct iattr * attr)
182 struct inode *inode = dentry->d_inode;
183 mode_t mode = inode->i_mode;
185 struct timespec now = CURRENT_TIME;
186 unsigned int ia_valid = attr->ia_valid;
191 attr->ia_ctime = now;
192 if (!(ia_valid & ATTR_ATIME_SET))
193 attr->ia_atime = now;
194 if (!(ia_valid & ATTR_MTIME_SET))
195 attr->ia_mtime = now;
196 if (ia_valid & ATTR_KILL_SUID) {
197 attr->ia_valid &= ~ATTR_KILL_SUID;
198 if (mode & S_ISUID) {
199 if (!(ia_valid & ATTR_MODE)) {
200 ia_valid = attr->ia_valid |= ATTR_MODE;
201 attr->ia_mode = inode->i_mode;
203 attr->ia_mode &= ~S_ISUID;
206 if (ia_valid & ATTR_KILL_SGID) {
207 attr->ia_valid &= ~ ATTR_KILL_SGID;
208 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
209 if (!(ia_valid & ATTR_MODE)) {
210 ia_valid = attr->ia_valid |= ATTR_MODE;
211 attr->ia_mode = inode->i_mode;
213 attr->ia_mode &= ~S_ISGID;
219 if (inode->i_op && inode->i_op->setattr) {
220 error = security_inode_setattr(dentry, attr);
222 error = inode->i_op->setattr(dentry, attr);
224 error = inode_change_ok(inode, attr);
226 error = security_inode_setattr(dentry, attr);
228 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
229 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid) ||
230 (ia_valid & ATTR_XID && attr->ia_xid != inode->i_xid))
231 error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
233 error = inode_setattr(inode, attr);
237 unsigned long dn_mask = setattr_mask(ia_valid);
239 dnotify_parent(dentry, dn_mask);
244 EXPORT_SYMBOL(notify_change);