vfs: allow file truncations when both suid and write permissions set

When suid is set and the non-owner user has write permission, any writing
into this file should be allowed and suid should be removed after that.

However, current kernel only allows writing without truncations, when we
do truncations on that file, we get EPERM.  This is a bug.

Steps to reproduce this bug:

% ls -l rootdir/file1
-rwsrwsrwx 1 root root 3 Jun 25 15:42 rootdir/file1
% echo h > rootdir/file1
zsh: operation not permitted: rootdir/file1
% ls -l rootdir/file1
-rwsrwsrwx 1 root root 3 Jun 25 15:42 rootdir/file1
% echo h >> rootdir/file1
% ls -l rootdir/file1
-rwxrwxrwx 1 root root 5 Jun 25 16:34 rootdir/file1

Signed-off-by: WANG Cong <[email protected]>
Cc: Eric Sandeen <[email protected]>
Acked-by: Eric Paris <[email protected]>
Cc: Eugene Teo <[email protected]>
Cc: Al Viro <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Stephen Smalley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: James Morris <[email protected]>

Author: Amerigo Wang

fs/open.c

@@ -199,7 +199,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user
 int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 	struct file *filp)
 {
-	int err;
+	int ret;
 	struct iattr newattrs;
 
 	/* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
@@ -214,12 +214,14 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 	}
 
 	/* Remove suid/sgid on truncate too */
-	newattrs.ia_valid |= should_remove_suid(dentry);
+	ret = should_remove_suid(dentry);
+	if (ret)
+		newattrs.ia_valid |= ret | ATTR_FORCE;
 
 	mutex_lock(&dentry->d_inode->i_mutex);
-	err = notify_change(dentry, &newattrs);
+	ret = notify_change(dentry, &newattrs);
 	mutex_unlock(&dentry->d_inode->i_mutex);
-	return err;
+	return ret;
 }
 
 static long do_sys_truncate(const char __user *pathname, loff_t length)