diff options
| author | Dwight Engen <dwight.engen@oracle.com> | 2013-08-15 14:08:03 -0400 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2013-08-15 14:25:01 -0500 |
| commit | 8c567a7fab6e086a0284eee2db82348521e7120c (patch) | |
| tree | d76cf8cae0c26e5981a9cf5534b596394207eaf0 /fs/xfs/xfs_ioctl.c | |
| parent | b9fe505258375b98519493a41a8088e384965aa9 (diff) | |
| download | linux-8c567a7fab6e086a0284eee2db82348521e7120c.tar.bz2 | |
xfs: add capability check to free eofblocks ioctl
Check for CAP_SYS_ADMIN since the caller can truncate preallocated
blocks from files they do not own nor have write access to. A more
fine grained access check was considered: require the caller to
specify their own uid/gid and to use inode_permission to check for
write, but this would not catch the case of an inode not reachable
via path traversal from the callers mount namespace.
Add check for read-only filesystem to free eofblocks ioctl.
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Dwight Engen <dwight.engen@oracle.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_ioctl.c')
| -rw-r--r-- | fs/xfs/xfs_ioctl.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index 20b4c7af2928..bdebc21078d7 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1723,6 +1723,12 @@ xfs_file_ioctl( struct xfs_fs_eofblocks eofb; struct xfs_eofblocks keofb; + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (mp->m_flags & XFS_MOUNT_RDONLY) + return -XFS_ERROR(EROFS); + if (copy_from_user(&eofb, arg, sizeof(eofb))) return -XFS_ERROR(EFAULT); |