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SubjectRe: [tech-board] [PATCH 00/11] xz: Updates to license, filters, and compression options
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"Kees Cook" <keescook@chromium.org> writes:

> On Wed, Mar 20, 2024 at 08:38:33PM +0200, Lasse Collin wrote:
>> XZ Embedded, the upstream project, switched from public domain to the
>> BSD Zero Clause License (0BSD). Now matching SPDX license identifiers
>> can be added.
>>
>> The new ARM64 and RISC-V filters can be used by Squashfs.
>>
>> Account for the default threading change made in the xz command line
>> tool version 5.6.0. Tweak kernel compression options for archs that
>> support XZ compressed kernel.
>>
>> Documentation was revised. There are minor cleanups too.
>>
>> Lasse Collin (11):
>> MAINTAINERS: Add XZ Embedded maintainers
>> LICENSES: Add 0BSD license text
>> xz: Switch from public domain to BSD Zero Clause License (0BSD)
>> xz: Documentation/staging/xz.rst: Revise thoroughly
>> xz: Fix comments and coding style
>> xz: Cleanup CRC32 edits from 2018
>> xz: Optimize for-loop conditions in the BCJ decoders
>> xz: Add ARM64 BCJ filter
>> xz: Add RISC-V BCJ filter
>> xz: Use 128 MiB dictionary and force single-threaded mode
>> xz: Adjust arch-specific options for better kernel compression
>>
>> Documentation/staging/xz.rst | 130 ++++++++---------------
>> LICENSES/deprecated/0BSD | 23 ++++
>> MAINTAINERS | 14 +++
>> include/linux/decompress/unxz.h | 5 +-
>> include/linux/xz.h | 5 +-
>> init/Kconfig | 5 +-
>> lib/decompress_unxz.c | 39 ++++---
>> lib/xz/Kconfig | 13 ++-
>> lib/xz/xz_crc32.c | 7 +-
>> lib/xz/xz_dec_bcj.c | 183 ++++++++++++++++++++++++++++++--
>> lib/xz/xz_dec_lzma2.c | 5 +-
>> lib/xz/xz_dec_stream.c | 5 +-
>> lib/xz/xz_dec_syms.c | 16 +--
>> lib/xz/xz_dec_test.c | 12 +--
>> lib/xz/xz_lzma2.h | 5 +-
>> lib/xz/xz_private.h | 20 ++--
>> lib/xz/xz_stream.h | 7 +-
>> scripts/Makefile.lib | 13 ++-
>> scripts/xz_wrap.sh | 157 +++++++++++++++++++++++++--
>> 19 files changed, 487 insertions(+), 177 deletions(-)
>> create mode 100644 LICENSES/deprecated/0BSD
>
> Andrew (and anyone else), please do not take this code right now.
>
> Until the backdooring of upstream xz[1] is fully understood, we should not
> accept any code from Jia Tan, Lasse Collin, or any other folks associated
> with tukaani.org. It appears the domain, or at least credentials
> associated with Jia Tan, have been used to create an obfuscated ssh
> server backdoor via the xz upstream releases since at least 5.6.0.
> Without extensive analysis, we should not take any associated code.
> It may be worth doing some retrospective analysis of past contributions
> as well...
>
> Lasse, are you able to comment about what is going on here?

FWIW, it looks like this series has been in linux-next for a few days.
Maybe it needs to come out, for now at least?

jon

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