Components in the kernel

BM-2cXpuLBVAk28ymCxs8EtRM9VxcZduZCEvY
Jul 22 13:41 [raw]

Since the XZ Embedded supports only streams with no integrity check or CRC32, make sure that you don't use some other integrity check type when encoding files that are supposed to be decoded by the kernel. These should not matter in practice all, since they don't cause security issues.

BM-2cXCGd8ma56aqXvMtRdXw6KMnWSSsRCZij
Jul 22 13:59 [raw]

For kernel makefiles, two commands are provided for use with $(call if_needed). The kernel image should be compressed with $(call if_needed,xzkern) which will use a BCJ filter and a big LZMA2 dictionary. Other things should be compressed with $(call if_needed,xzmisc) which will use no BCJ filter and 1 MiB LZMA2 dictionary. Don't bother Igor Pavlov with questions about the XZ implementation in the kernel or about XZ Utils.

BM-2cTZ5Hmrzvmud7XpkiKSKxy5wLFMWCGj7i
Jul 22 13:59 [raw]

The wrapper sets compression options to values suitable for compressing the kernel image. While these two implementations include essential code that is directly based on Igor Pavlov's code, these implementations aren't maintained nor supported by him.

BM-2cV3fYhXykEQ313rGJjfgVaH7BsyquYYnd
Jul 22 14:00 [raw]

The xz_dec_test module is for testing xz_dec. xz_dec_test is not useful unless you are hacking the XZ decompressor. Report bugs to <lasse.collin@tukaani.org> or visit #tukaani on Freenode and talk to Larhzu. xz_dec_test allocates a char device major dynamically to which one can write .xz files from userspace.

BM-2cTZRxPcG4yzDWjmxek2MYGCoPiBsX2Rha
Jul 22 14:01 [raw]

Other things should be compressed with $(call if_needed,xzmisc) which will use no BCJ filter and 1 MiB LZMA2 dictionary. See the xz_dec_test source code for the details. There are a couple of corner cases where things have been simplified at expense of detecting errors as early as possible. An exception to above dictionary size limitation is when the decoder is used in single-call mode. Decompressing the kernel itself is an.

BM-2cXVmND6AeXiQZPG9VajXVhdWb6vjptqPA
Jul 22 14:03 [raw]

The home page of XZ Embedded is at <http://tukaani.org/xz/embedded.html>, where you can find the latest version and also information about using the code outside the Linux kernel. LZMA2 is slower to compress than e.g. Deflate or LZO even at the fastest settings, so it isn't clear if LZMA2 encoder is wanted into the kernel. Since the XZ Embedded supports only streams with no integrity check or CRC32, make sure that you don't use some other integrity check type when encoding files that are supposed to be decoded by the kernel. For kernel makefiles, two commands are provided for use with $(call if_needed). The kernel image should be compressed with $(call if_needed,xzkern) which will use a BCJ filter and a big LZMA2 dictionary.

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