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Commit 4a58579b authored by Akira Fujita's avatar Akira Fujita Committed by Theodore Ts'o
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ext4: Fix insufficient checks in EXT4_IOC_MOVE_EXT 



This patch fixes three problems in the handling of the
EXT4_IOC_MOVE_EXT ioctl:

1. In current EXT4_IOC_MOVE_EXT, there are read access mode checks for
original and donor files, but they allow the illegal write access to
donor file, since donor file is overwritten by original file data.  To
fix this problem, change access mode checks of original (r->r/w) and
donor (r->w) files.

2.  Disallow the use of donor files that have a setuid or setgid bits.

3.  Call mnt_want_write() and mnt_drop_write() before and after
ext4_move_extents() calling to get write access to a mount.

Signed-off-by: default avatarAkira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent b436b9be

fs/ext4/ioctl.c

+18 −12
Original line number Diff line number Diff line
@@ -221,32 +221,38 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 
		struct file *donor_filp;

		int err;



		if (!(filp->f_mode & FMODE_READ) ||

		    !(filp->f_mode & FMODE_WRITE))

			return -EBADF;



		if (copy_from_user(&me,

			(struct move_extent __user *)arg, sizeof(me)))

			return -EFAULT;

		me.moved_len = 0;



		donor_filp = fget(me.donor_fd);

		if (!donor_filp)

			return -EBADF;



		if (!capable(CAP_DAC_OVERRIDE)) {

			if ((current->real_cred->fsuid != inode->i_uid) ||

				!(inode->i_mode & S_IRUSR) ||

				!(donor_filp->f_dentry->d_inode->i_mode &

				S_IRUSR)) {

				fput(donor_filp);

				return -EACCES;

			}

		if (!(donor_filp->f_mode & FMODE_WRITE)) {

			err = -EBADF;

			goto mext_out;

		}



		me.moved_len = 0;

		err = mnt_want_write(filp->f_path.mnt);

		if (err)

			goto mext_out;



		err = ext4_move_extents(filp, donor_filp, me.orig_start,

					me.donor_start, me.len, &me.moved_len);

		fput(donor_filp);

		mnt_drop_write(filp->f_path.mnt);

		if (me.moved_len > 0)

			file_remove_suid(donor_filp);



		if (copy_to_user((struct move_extent *)arg, &me, sizeof(me)))

			return -EFAULT;



			err = -EFAULT;

mext_out:

		fput(donor_filp);

		return err;

	}

fs/ext4/move_extent.c

+7 −0
Original line number Diff line number Diff line
@@ -957,6 +957,13 @@ mext_check_arguments(struct inode *orig_inode, 
		return -EINVAL;

	}



	if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {

		ext4_debug("ext4 move extent: suid or sgid is set"

			   " to donor file [ino:orig %lu, donor %lu]\n",

			   orig_inode->i_ino, donor_inode->i_ino);

		return -EINVAL;

	}



	/* Ext4 move extent does not support swapfile */

	if (IS_SWAPFILE(orig_inode) || IS_SWAPFILE(donor_inode)) {

		ext4_debug("ext4 move extent: The argument files should "