2.6.31-stable review patch. If anyone has any objections, please let us know. ------------------ (cherry picked from commit 4a58579b9e4e2a35d57e6c9c8483e52f6f1b7fd6) 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: Akira Fujita Signed-off-by: "Theodore Ts'o" Signed-off-by: Greg Kroah-Hartman --- fs/ext4/ioctl.c | 30 ++++++++++++++++++------------ fs/ext4/move_extent.c | 7 +++++++ 2 files changed, 25 insertions(+), 12 deletions(-) --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -221,32 +221,38 @@ setversion_out: 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; } --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -957,6 +957,13 @@ mext_check_arguments(struct inode *orig_ 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 " -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/