73968defdd
In the zstream code, Coverity reported: "The argument could be controlled by an attacker, who could invoke the function with arbitrary values (for example, a very high or negative buffer size)." It did not report this in the kernel. This is likely because the userspace code stored this in an int before passing it into the allocator, while the kernel code stored it in a uint32_t. However, this did reveal a potentially real problem. On 32-bit systems and systems with only 4GB of physical memory or less in general, it is possible to pass a large enough value that the system will hang. Even worse, on Linux systems, the kernel memory allocator is not able to support allocations up to the maximum 4GB allocation size that this allows. This had already been limited in userspace to 64MB by `ZFS_SENDRECV_MAX_NVLIST`, but we need a hard limit in the kernel to protect systems. After some discussion, we settle on 256MB as a hard upper limit. Attempting to receive a stream that requires more memory than that will result in E2BIG being returned to user space. Reported-by: Coverity (CID-1529836) Reported-by: Coverity (CID-1529837) Reported-by: Coverity (CID-1529838) Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu> Closes #14285 |
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README.md
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.