Merge commit 'v2.6.30' into for-2.6.31

[safe/jmp/linux-2.6] / fs / attr.c

diff --git a/fs/attr.c b/fs/attr.c
index ae58bd3..9fe1b1b 100644 (file)
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -29,13 +29,13 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
 
        /* Make sure a caller can chown. */
        if ((ia_valid & ATTR_UID) &&
-           (current->fsuid != inode->i_uid ||
+           (current_fsuid() != inode->i_uid ||
             attr->ia_uid != inode->i_uid) && !capable(CAP_CHOWN))
                goto error;
 
        /* Make sure caller can chgrp. */
        if ((ia_valid & ATTR_GID) &&
-           (current->fsuid != inode->i_uid ||
+           (current_fsuid() != inode->i_uid ||
            (!in_group_p(attr->ia_gid) && attr->ia_gid != inode->i_gid)) &&
            !capable(CAP_CHOWN))
                goto error;
@@ -51,7 +51,7 @@ int inode_change_ok(struct inode *inode, struct iattr *attr)
        }
 
        /* Check for setting the inode time. */
-       if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET)) {
+       if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) {
                if (!is_owner_or_cap(inode))
                        goto error;
        }
@@ -103,12 +103,16 @@ EXPORT_SYMBOL(inode_setattr);
 int notify_change(struct dentry * dentry, struct iattr * attr)
 {
        struct inode *inode = dentry->d_inode;
-       mode_t mode;
+       mode_t mode = inode->i_mode;
        int error;
        struct timespec now;
        unsigned int ia_valid = attr->ia_valid;
 
-       mode = inode->i_mode;
+       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;
@@ -125,18 +129,25 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
                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) {
-               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;
+                       ia_valid = attr->ia_valid |= ATTR_MODE;
+                       attr->ia_mode = (inode->i_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;
@@ -145,24 +156,25 @@ int notify_change(struct dentry * dentry, struct iattr * attr)
                        attr->ia_mode &= ~S_ISGID;
                }
        }
-       if (!attr->ia_valid)
+       if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID)))
                return 0;
 
+       error = security_inode_setattr(dentry, attr);
+       if (error)
+               return error;
+
        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);
+               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;
+                               error = vfs_dq_transfer(inode, attr) ?
+                                       -EDQUOT : 0;
                        if (!error)
                                error = inode_setattr(inode, attr);
                }