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/capability.h>
14 #include <linux/fsnotify.h>
15 #include <linux/fcntl.h>
16 #include <linux/quotaops.h>
17 #include <linux/security.h>
18 #include <linux/proc_fs.h>
19 #include <linux/devpts_fs.h>
20 #include <linux/vs_base.h>
21 #include <linux/vserver/debug.h>
23 /* Taken over from the old code... */
25 /* POSIX UID/GID verification for setting inode attributes. */
26 int inode_change_ok(struct inode *inode, struct iattr *attr)
29 unsigned int ia_valid = attr->ia_valid;
31 /* If force is set do it anyway. */
32 if (ia_valid & ATTR_FORCE)
35 /* Make sure a caller can chown. */
36 if ((ia_valid & ATTR_UID) &&
37 (current->fsuid != inode->i_uid ||
38 attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
41 /* Make sure caller can chgrp. */
42 if ((ia_valid & ATTR_GID) &&
43 (current->fsuid != inode->i_uid ||
44 (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
48 /* Make sure a caller can chmod. */
49 if (ia_valid & ATTR_MODE) {
50 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
52 /* Also check the setgid bit! */
53 if (!in_group_p((ia_valid & ATTR_GID) ? attr->ia_gid :
54 inode->i_gid) && !capable(CAP_FSETID))
55 attr->ia_mode &= ~S_ISGID;
58 /* Check for setting the inode time. */
59 if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
60 if (current->fsuid != inode->i_uid && !capable(CAP_FOWNER))
64 /* Check for evil vserver activity */
65 if (vx_check(0, VX_ADMIN))
68 if (IS_BARRIER(inode)) {
69 vxwprintk(1, "xid=%d messing with the barrier.",
73 switch (inode->i_sb->s_magic) {
74 case PROC_SUPER_MAGIC:
75 vxwprintk(1, "xid=%d messing with the procfs.",
78 case DEVPTS_SUPER_MAGIC:
79 if (vx_check(inode->i_xid, VX_IDENT))
81 vxwprintk(1, "xid=%d messing with the devpts.",
91 EXPORT_SYMBOL(inode_change_ok);
93 int inode_setattr(struct inode * inode, struct iattr * attr)
95 unsigned int ia_valid = attr->ia_valid;
97 if (ia_valid & ATTR_SIZE &&
98 attr->ia_size != i_size_read(inode)) {
99 int error = vmtruncate(inode, attr->ia_size);
104 if (ia_valid & ATTR_UID)
105 inode->i_uid = attr->ia_uid;
106 if (ia_valid & ATTR_GID)
107 inode->i_gid = attr->ia_gid;
108 if ((ia_valid & ATTR_XID) && IS_TAGXID(inode))
109 inode->i_xid = attr->ia_xid;
110 if (ia_valid & ATTR_ATIME)
111 inode->i_atime = timespec_trunc(attr->ia_atime,
112 inode->i_sb->s_time_gran);
113 if (ia_valid & ATTR_MTIME)
114 inode->i_mtime = timespec_trunc(attr->ia_mtime,
115 inode->i_sb->s_time_gran);
116 if (ia_valid & ATTR_CTIME)
117 inode->i_ctime = timespec_trunc(attr->ia_ctime,
118 inode->i_sb->s_time_gran);
119 if (ia_valid & ATTR_MODE) {
120 umode_t mode = attr->ia_mode;
122 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
124 inode->i_mode = mode;
126 mark_inode_dirty(inode);
130 EXPORT_SYMBOL(inode_setattr);
132 int notify_change(struct dentry * dentry, struct iattr * attr)
134 struct inode *inode = dentry->d_inode;
138 unsigned int ia_valid = attr->ia_valid;
140 mode = inode->i_mode;
141 now = current_fs_time(inode->i_sb);
143 attr->ia_ctime = now;
144 if (!(ia_valid & ATTR_ATIME_SET))
145 attr->ia_atime = now;
146 if (!(ia_valid & ATTR_MTIME_SET))
147 attr->ia_mtime = now;
148 if (ia_valid & ATTR_KILL_SUID) {
149 attr->ia_valid &= ~ATTR_KILL_SUID;
150 if (mode & S_ISUID) {
151 if (!(ia_valid & ATTR_MODE)) {
152 ia_valid = attr->ia_valid |= ATTR_MODE;
153 attr->ia_mode = inode->i_mode;
155 attr->ia_mode &= ~S_ISUID;
158 if (ia_valid & ATTR_KILL_SGID) {
159 attr->ia_valid &= ~ ATTR_KILL_SGID;
160 if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
161 if (!(ia_valid & ATTR_MODE)) {
162 ia_valid = attr->ia_valid |= ATTR_MODE;
163 attr->ia_mode = inode->i_mode;
165 attr->ia_mode &= ~S_ISGID;
171 if (ia_valid & ATTR_SIZE)
172 down_write(&dentry->d_inode->i_alloc_sem);
174 if (inode->i_op && inode->i_op->setattr) {
175 error = security_inode_setattr(dentry, attr);
177 error = inode->i_op->setattr(dentry, attr);
179 error = inode_change_ok(inode, attr);
181 error = security_inode_setattr(dentry, attr);
183 if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
184 (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid) ||
185 (ia_valid & ATTR_XID && attr->ia_xid != inode->i_xid))
186 error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
188 error = inode_setattr(inode, attr);
192 if (ia_valid & ATTR_SIZE)
193 up_write(&dentry->d_inode->i_alloc_sem);
196 fsnotify_change(dentry, ia_valid);
201 EXPORT_SYMBOL(notify_change);