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To reduce memory usage ZFS crypto allocated bigger by 56 bytes ARC headers only when specific block was encrypted on disk. It was a nice optimization, except in some cases the code reallocated them on fly, that invalidated header pointers from the buffers. Since the buffers use different locking, it created number of races, that were originally covered (at least partially) by b_evict_lock, used also to protection evictions. But it has gone as part of #14340. As result, as was found in #15293, arc_hdr_realloc_crypt() ended up unprotected and causing use-after-free. Instead of introducing some even more elaborate locking, this patch just drops the difference between normal and protected headers. It cost us additional 56 bytes per header, but with couple patches saving 24 bytes, the net growth is only 32 bytes with total header size of 232 bytes on FreeBSD, that IMHO is acceptable price for simplicity. Additional locking would also end up consuming space, time or both. Reviewe-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15293 Closes #15347 |
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.
Official Resources
- Documentation - for using and developing this repo
- ZoL Site - Linux release info & links
- Mailing lists
- OpenZFS site - for conference videos and info on other platforms (illumos, OSX, Windows, etc)
Installation
Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.
Contribute & Develop
We have a separate document with contribution guidelines.
We have a Code of Conduct.
Release
OpenZFS is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197
Supported Kernels
- The
METAfile contains the officially recognized supported Linux kernel versions. - Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.