Author: fsu
Date: Sun Jul 7 08:58:02 2019
New Revision: 349802
URL: https://svnweb.freebsd.org/changeset/base/349802
Log:
Add additional check for 'blocks per group' and 'fragments per group'
superblock fields.
These fields will not be equal only in case if bigalloc filesystem feature is
turned on.
This feature is not supported for now.
Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of
Fraunhofer FKIE
Reported as: FS-27-EXT2-12: Denial of Service in openat-0
(vm_fault_hold/ext2_clusteracct)
MFC after: 2 weeks
Modified:
head/sys/fs/ext2fs/ext2_vfsops.c
Modified: head/sys/fs/ext2fs/ext2_vfsops.c
==============================================================================
--- head/sys/fs/ext2fs/ext2_vfsops.c Sun Jul 7 08:56:13 2019
(r349801)
+++ head/sys/fs/ext2fs/ext2_vfsops.c Sun Jul 7 08:58:02 2019
(r349802)
@@ -559,7 +559,12 @@ ext2_compute_sb_data(struct vnode *devvp, struct ext2f
SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
"zero blocks/fragments per group");
return (EINVAL);
+ } else if (fs->e2fs_bpg != fs->e2fs_fpg) {
+ SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
+ "blocks per group not equal fragments per group");
+ return (EINVAL);
}
+
if (fs->e2fs_bpg != fs->e2fs_bsize * 8) {
SDT_PROBE1(ext2fs, , vfsops, ext2_compute_sb_data_error,
"non-standard group size unsupported");
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