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fix: detect compressed kernel modules (.ko.gz, .ko.xz, .ko.zst) (#4740)

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* fix: detect compressed kernel modules (.ko.gz, .ko.xz, .ko.zst)

The linux-kernel-cataloger only matched plain *.ko files, missing
compressed modules produced when CONFIG_MODULE_COMPRESS is enabled
(common on Debian 13 / Ubuntu 24.04+). This resulted in near-zero
module packages being reported for such filesystems.

Changes:
- Add *.ko.gz, *.ko.xz, *.ko.zst glob patterns to both the cataloger
  and capabilities.yaml so the file resolver picks up compressed modules
- Add decompressedModuleReader() which detects the extension and
  transparently decompresses via compress/gzip, ulikunitz/xz, or
  klauspost/compress/zstd before handing the ELF bytes to the existing
  parseLinuxKernelModuleMetadata parser
- Promote github.com/klauspost/compress from indirect to direct dependency
- Add unit tests covering all three compression formats plus the
  uncompressed baseline, using a programmatically generated minimal ELF

Fixes #4721

Signed-off-by: Will Bates <william.bates11@outlook.com>

* address reading archives into memory

Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>

---------

Signed-off-by: Will Bates <william.bates11@outlook.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Will Bates <william.bates11@outlook.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>
This commit is contained in:
William Bates
2026-05-13 13:44:18 -04:00
committed by GitHub
co-authored by Will Bates Alex Goodman
parent 07ae2ca08d
commit 4579d11abc
5 changed files with 394 additions and 4 deletions
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@@ -62,6 +62,7 @@ require (
github.com/jedib0t/go-pretty/v6 v6.7.8
github.com/jinzhu/copier v0.4.0
github.com/kastenhq/goversion v0.0.0-20230811215019-93b2f8823953
github.com/klauspost/compress v1.18.5
github.com/magiconair/properties v1.8.10
github.com/mholt/archives v0.1.5
github.com/moby/sys/mountinfo v0.7.2
@@ -215,7 +216,6 @@ require (
github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
github.com/json-iterator/go v1.1.12 // indirect
github.com/kevinburke/ssh_config v1.2.0 // indirect
github.com/klauspost/compress v1.18.5 // indirect
github.com/klauspost/cpuid/v2 v2.3.0 // indirect
github.com/klauspost/pgzip v1.2.6 // indirect
github.com/kr/pretty v0.3.1 // indirect