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James Pan 472e7c6085 sa_find_sizes() may compute wrong SA header size 
Under the right conditions sa_find_sizes() will compute an incorrect
size of the system attribute (SA) header.  This causes a failed assertion
when the SA_HDR_SIZE_MATCH_LAYOUT() test returns false, and may lead
to corruption of SA data.

The bug presents itself when there are more than two variable-length SAs
of just the right size to fit in the bonus buffer of a dnode.  The
existing logic fails to account for the SA header space needed to store
the sizes of all the variable-length SAs.

A reproducer was possible on Linux by setting the xattr=sa dataset
property and storing xattrs on symbolic links (Issue #1648).  Note the
corrupt link target name:

$ zfs set xattr=sa tank/fish
$ cd /tank/fish
$ ln -fs 12345678901234567 link
$ setfattr -n trusted.0000000000000000000 -v 0x000000000000000000000000 -h link
$ setfattr -n trusted.1111111111111111111 -v 0x000000000000000000000000 -h link
$ ls -l link
lrwxrwxrwx 1 root root 17 Dec  6 15:40 link -> 90123456701234567

Commit 6a7c0ccca4 worked around this bug
by forcing xattr's on symlinks to be stored in directory format.  This
change implements a proper fix, so the workaround can now be reverted.

The reference link below contains a reproducer for FreeBSD.

References:
  http://lists.open-zfs.org/pipermail/developer/2013-November/000306.html

Ported-by: Ned Bass <bass6@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1890
2013-12-10 09:48:15 -08:00
cmd Drive database update 2013-12-02 14:07:26 -08:00
config Properly ignore bdi_setup_and_register return value 2013-12-04 14:53:45 -08:00
dracut Refresh dracut module setup 2013-03-21 12:51:06 -07:00
etc Update init script to allow verbose mounts 2013-12-06 10:59:35 -08:00
include Illumos #4045 write throttle & i/o scheduler performance work 2013-12-06 09:32:43 -08:00
lib Illumos #2583 2013-11-21 11:13:53 -08:00
man Illumos #4045 write throttle & i/o scheduler performance work 2013-12-06 09:32:43 -08:00
module sa_find_sizes() may compute wrong SA header size 2013-12-10 09:48:15 -08:00
patches Adding grub2 mkconfig support patch 2012-07-30 16:17:23 -07:00
rpm Change zfs-dkms requirement 2013-11-21 11:13:58 -08:00
scripts Add cstyle.pl utility and cstyle.1 man page 2013-10-30 11:36:30 -07:00
udev Open pools asynchronously after module load 2013-07-03 09:24:38 -07:00
.gitignore Ignore *.{deb,rpm,tar.gz} files in the top directory. 2013-04-24 16:18:59 -07:00
AUTHORS Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
autogen.sh build: do not call boilerplate ourself 2013-04-02 10:55:20 -07:00
configure.ac Add dbufstat.py command 2013-10-25 14:52:45 -07:00
copy-builtin Consistent menuconfig name 2012-08-26 13:49:37 -07:00
COPYRIGHT Refresh links to web site 2013-03-06 15:46:41 -08:00
DISCLAIMER Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
Makefile.am Add cstyle.pl utility and cstyle.1 man page 2013-10-30 11:36:30 -07:00
META Tag zfs-0.6.2 2013-08-22 13:33:26 -07:00
OPENSOLARIS.LICENSE Add CDDL license file 2008-12-01 14:49:34 -08:00
README.markdown Fix minor typos and update marketing copy. 2013-03-21 12:51:06 -07:00
zfs-script-config.sh.in Retire zpool_id infrastructure 2013-01-29 12:23:17 -08:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.markdown

Native ZFS for Linux!

ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.

ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.

Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org