static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
{
struct inode * inode;
int error;
struct iattr newattrs;
error = -ENOENT;
if (!(inode = dentry->d_inode)) {
printk("chown_common: NULL inode\n");
goto out;
}
error = -EROFS;
if (IS_RDONLY(inode))
goto out;
error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
goto out;
if (user == (uid_t) -1)
user = inode->i_uid;
if (group == (gid_t) -1)
group = inode->i_gid;
newattrs.ia_mode = inode->i_mode;
newattrs.ia_uid = user;
newattrs.ia_gid = group;
newattrs.ia_valid = ATTR_UID | ATTR_GID | ATTR_CTIME;
/*
* If the user or group of a non-directory has been changed by a
* non-root user, remove the setuid bit.
* 19981026 David C Niemi <*****@*****.**>
*
* Changed this to apply to all users, including root, to avoid
* some races. This is the behavior we had in 2.0. The check for
* non-root was definitely wrong for 2.2 anyway, as it should
* have been using CAP_FSETID rather than fsuid -- 19990830 SD.
*/
if ((inode->i_mode & S_ISUID) == S_ISUID &&
!S_ISDIR(inode->i_mode))
{
newattrs.ia_mode &= ~S_ISUID;
newattrs.ia_valid |= ATTR_MODE;
}
/*
* Likewise, if the user or group of a non-directory has been changed
* by a non-root user, remove the setgid bit UNLESS there is no group
* execute bit (this would be a file marked for mandatory locking).
* 19981026 David C Niemi <*****@*****.**>
*
* Removed the fsuid check (see the comment above) -- 19990830 SD.
*/
if (((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))
&& !S_ISDIR(inode->i_mode))
{
newattrs.ia_mode &= ~S_ISGID;
newattrs.ia_valid |= ATTR_MODE;
}
error = DQUOT_TRANSFER(dentry, &newattrs);
out:
return error;
}
int jfs_setattr(struct dentry *dentry, struct iattr *iattr)
{
struct inode *inode = dentry->d_inode;
int rc;
rc = inode_change_ok(inode, iattr);
if (rc)
return rc;
if ((iattr->ia_valid & ATTR_UID && iattr->ia_uid != inode->i_uid) ||
(iattr->ia_valid & ATTR_GID && iattr->ia_gid != inode->i_gid)) {
if (DQUOT_TRANSFER(inode, iattr))
return -EDQUOT;
}
rc = inode_setattr(inode, iattr);
if (!rc && (iattr->ia_valid & ATTR_MODE))
rc = jfs_acl_chmod(inode);
return rc;
}
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
int error;
time_t now = CURRENT_TIME;
unsigned int ia_valid = attr->ia_valid;
if (!inode)
BUG();
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
attr->ia_atime = now;
if (!(ia_valid & ATTR_MTIME_SET))
attr->ia_mtime = now;
lock_kernel();
if (inode->i_op && inode->i_op->setattr)
error = inode->i_op->setattr(dentry, attr);
else {
error = inode_change_ok(inode, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
unlock_kernel();
if (!error) {
unsigned long dn_mask = setattr_mask(ia_valid);
if (dn_mask)
dnotify_parent(dentry, dn_mask);
}
return error;
}
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
mode_t mode;
int error;
struct timespec now;
unsigned int ia_valid = attr->ia_valid;
mode = inode->i_mode;
now = current_fs_time(inode->i_sb);
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
attr->ia_atime = now;
if (!(ia_valid & ATTR_MTIME_SET))
attr->ia_mtime = now;
if (ia_valid & ATTR_KILL_SUID) {
attr->ia_valid &= ~ATTR_KILL_SUID;
if (mode & S_ISUID) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = inode->i_mode;
}
attr->ia_mode &= ~S_ISUID;
}
}
if (ia_valid & ATTR_KILL_SGID) {
attr->ia_valid &= ~ ATTR_KILL_SGID;
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = inode->i_mode;
}
attr->ia_mode &= ~S_ISGID;
}
}
if (!attr->ia_valid)
return 0;
if (ia_valid & ATTR_SIZE)
down_write(&dentry->d_inode->i_alloc_sem);
if (inode->i_op && inode->i_op->setattr) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = inode->i_op->setattr(dentry, attr);
} else {
error = inode_change_ok(inode, attr);
if (!error)
error = security_inode_setattr(dentry, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
if (ia_valid & ATTR_SIZE)
up_write(&dentry->d_inode->i_alloc_sem);
if (!error)
fsnotify_change(dentry, ia_valid);
return error;
}
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
mode_t mode = inode->i_mode;
int error;
struct timespec now;
unsigned int ia_valid = attr->ia_valid;
if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) {
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
}
now = current_fs_time(inode->i_sb);
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
attr->ia_atime = now;
if (!(ia_valid & ATTR_MTIME_SET))
attr->ia_mtime = now;
if (ia_valid & ATTR_KILL_PRIV) {
attr->ia_valid &= ~ATTR_KILL_PRIV;
ia_valid &= ~ATTR_KILL_PRIV;
error = security_inode_need_killpriv(dentry);
if (error > 0)
error = security_inode_killpriv(dentry);
if (error)
return error;
}
/*
* We now pass ATTR_KILL_S*ID to the lower level setattr function so
* that the function has the ability to reinterpret a mode change
* that's due to these bits. This adds an implicit restriction that
* no function will ever call notify_change with both ATTR_MODE and
* ATTR_KILL_S*ID set.
*/
if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) &&
(ia_valid & ATTR_MODE))
BUG();
if (ia_valid & ATTR_KILL_SUID) {
if (mode & S_ISUID) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = (inode->i_mode & ~S_ISUID);
}
}
if (ia_valid & ATTR_KILL_SGID) {
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = inode->i_mode;
}
attr->ia_mode &= ~S_ISGID;
}
}
if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
return 0;
if (ia_valid & ATTR_SIZE)
down_write(&dentry->d_inode->i_alloc_sem);
if (inode->i_op && inode->i_op->setattr) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = inode->i_op->setattr(dentry, attr);
} else {
error = inode_change_ok(inode, attr);
if (!error)
error = security_inode_setattr(dentry, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
if (ia_valid & ATTR_SIZE)
up_write(&dentry->d_inode->i_alloc_sem);
if (!error)
fsnotify_change(dentry, ia_valid);
return error;
}
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
int error;
struct timespec now;
unsigned int ia_valid = attr->ia_valid;
mode_t ia_mode = attr->ia_mode;
now = current_fs_time(inode->i_sb);
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
attr->ia_atime = now;
if (!(ia_valid & ATTR_MTIME_SET))
attr->ia_mtime = now;
if (ia_valid & ATTR_KILL_SUID) {
ia_valid &= ~ATTR_KILL_SUID;
if (inode->i_mode & S_ISUID) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid |= ATTR_MODE;
ia_mode = inode->i_mode;
}
ia_mode &= ~S_ISUID;
}
}
if (ia_valid & ATTR_KILL_SGID) {
ia_valid &= ~ATTR_KILL_SGID;
if ((inode->i_mode & (S_ISGID | S_IXGRP)) ==
(S_ISGID | S_IXGRP)) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid |= ATTR_MODE;
ia_mode = inode->i_mode;
}
ia_mode &= ~S_ISGID;
}
}
if (!ia_valid)
return 0;
/*
* For RHEL, we've added the S_NOATTRKILL flag to allow filesystems
* to opt-out of ATTR_KILL_S*ID processing. The ATTR_KILL_S*ID bits
* are now handled in two stages. First, we calculate what the
* ia_valid and the ia_mode would look like if we were to allow the
* ATTR_KILL_S*ID bits to modify them. We then make the decision of
* whether to allow the modification to occur. We could just skip
* all of the ATTR_KILL_S*ID processing altogether, but we need it
* for inotify. If a process is watching for mode changes, we want
* it to be notified if we suspect that the server will be doing the
* mode change for us.
*/
if ((ia_valid & ATTR_MODE) && !(inode->i_flags & S_NOATTRKILL)) {
attr->ia_valid = ia_valid;
attr->ia_mode = ia_mode;
}
if (ia_valid & ATTR_SIZE)
down_write(&dentry->d_inode->i_alloc_sem);
if (inode->i_op && inode->i_op->setattr) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = inode->i_op->setattr(dentry, attr);
} else {
error = inode_change_ok(inode, attr);
if (!error)
error = security_inode_setattr(dentry, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
if (ia_valid & ATTR_SIZE)
up_write(&dentry->d_inode->i_alloc_sem);
if (!error)
fsnotify_change(dentry, ia_valid);
return error;
}
int notify_change(struct dentry * dentry, struct iattr * attr)
{
struct inode *inode = dentry->d_inode;
mode_t mode = inode->i_mode;
int error;
struct timespec now = CURRENT_TIME;
unsigned int ia_valid = attr->ia_valid;
if (!inode)
BUG();
attr->ia_ctime = now;
if (!(ia_valid & ATTR_ATIME_SET))
attr->ia_atime = now;
if (!(ia_valid & ATTR_MTIME_SET))
attr->ia_mtime = now;
if (ia_valid & ATTR_KILL_SUID) {
attr->ia_valid &= ~ATTR_KILL_SUID;
if (mode & S_ISUID) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = inode->i_mode;
}
attr->ia_mode &= ~S_ISUID;
}
}
if (ia_valid & ATTR_KILL_SGID) {
attr->ia_valid &= ~ ATTR_KILL_SGID;
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
if (!(ia_valid & ATTR_MODE)) {
ia_valid = attr->ia_valid |= ATTR_MODE;
attr->ia_mode = inode->i_mode;
}
attr->ia_mode &= ~S_ISGID;
}
}
if (!attr->ia_valid)
return 0;
if (inode->i_op && inode->i_op->setattr) {
error = security_inode_setattr(dentry, attr);
if (!error)
error = inode->i_op->setattr(dentry, attr);
} else {
error = inode_change_ok(inode, attr);
if (!error)
error = security_inode_setattr(dentry, attr);
if (!error) {
if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid))
error = DQUOT_TRANSFER(inode, attr) ? -EDQUOT : 0;
if (!error)
error = inode_setattr(inode, attr);
}
}
if (!error) {
#ifdef CONFIG_MOT_FEAT_INOTIFY
fsnotify_change(dentry, ia_valid);
#else
unsigned long dn_mask = setattr_mask(ia_valid);
if (dn_mask)
dnotify_parent(dentry, dn_mask);
#endif
}
return error;
}
