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Systrack changelog

v0.5

We tried so hard, and got so far, but in the end, we need a disassembler! x86 mitigations have defeated us, we no longer have syscall tables to rely on. Kernel developers were kind enough to write very simple ABI-specific switch-based handlers to dispach syscalls, so analysis is still possible... just significantly more complicated.

Breaking changes:

  • Drop support for Python 3.6 and 3.7. Systrack now requires Python 3.8+. This is because of the new dependency on iced-x86.

Improvements:

  • x86: support new kernels (6.9+) with no syscall tables.
  • Remove unnecessary spaces between asterisks for double pointers in function signatures.
  • Avoid KFCI __{cfi,pfx}_ symbols when looking for ni_syscall symbols.

Internal changes:

  • Depend on iced-x86 for disassembling x86 instructions and on jinja2 for HTML output directly. Remove optional dependencies and only build one package.
  • Rename test folder to tests to use the hatch test as test commnad
  • Improve logging reproducibility by sorting more debugging log output.
  • Improve broken Python package metadata (Python packaging moment).

v0.4

New arch support: PowerPC 32-bit, tested on v5.0+ kernels.

Improvements:

  • Improve kconfig dependency checking logic for better warning/error messages.
  • PowerPC PPC64: improve esoteric fast switch_endian syscall detection.
  • Better (narrower) emoji spacing in HTML output.

Bug fixes:

  • Correctly report delete_module depending on CONFIG_MODULE_UNLOAD=y.
  • Fix incorrectly handled shared syscall table in x86-64 x32 ABI resulting in duplicated and unwanted entries in the output for kernels older than v5.4.
  • Fix chance of building kernels without memfd_create, memfd_secret, delete_module (and possibly others) by always enabling MEMFD_CREATE, MODULE_UNLOAD, NET and SECRETMEM when available.
  • Fix wrong handling of relative --kdir path (e.g., .) in some cases.
  • Fix missed detection of non-implemented syscalls pointing to kernel/sys_ni.c when DWARF debug info contains relative paths.
  • x86 x32: fix some x64 syscalls reported twice because both the x64 number and the historycally misnumbered x32 numbers (512-547) were being considered valid.

Internal changes:

  • Ignore sound/ and user/ dirs to speed up grepping syscall definitions.
  • Implement some basic unit tests for powerpc dummy/esoteric syscall detection.

v0.3.3

Improvements:

  • Correctly report lsm_{list_modules,get_self_attr,set_self_attr} depending on CONFIG_SECURITY=y.

v0.3.2

Improvements:

  • Correctly report futex_{wait,wake,requeue} depending on CONFIG_FUTEX=y.
  • Use unicorn emoji (cuter) instead of test tube for esoteric syscalls in HTML output.

v0.3.1

Improvements:

  • x86: Add build support for map_shadow_stack.
  • Prefer compat_sys_ over __se_compat_sys_ and other longer symbol synonyms; same for .compat_sys_ on PowerPC.

Bug fixes:

  • Fix broken naive grepping of syscall definitions when no ripgrep is available.
  • Correctly report cachestat depending on CACHESTAT_SYSCALL=y.

Internal changes:

  • Sort stderr logs for reproducible output and easier diffing.
  • Skip lib/ directory in kernel sources to improve grepping performance.

v0.3

New arch support: PowerPC 64-bit, all ABIs, tested on v5.0+ kernels.

Improvements:

  • Add ABI bits (integer) and compat (boolean) fields to JSON output.
  • Support ELF symbols with weird names (special chars in the name).
  • Support function descriptors for syscall table entries (useful for PowerPC64 and Itanium 64).
  • Support weird arch-specific SYSCALL_DEFINEn macros.
  • Building kernels now generates relative paths in DWARF debug symbols through -fdebug-prefix-map.
  • Improve stdout output and add a table header.
  • Use null instead of ??/? for unknown file/line info in JSON output.
  • x86: improve dummy syscall implementation detection (handling endbr64/32 instructions).
  • ARM OABI: output syscall number location for the calling convention (swi <NR>).

Bug fixes:

  • Correctly report socketcall depending on CONFIG_NET=y.
  • Correctly strip more syscall symbol prefixes for more accurate syscall names.
  • Fix bad symbol prefix detection in some weird edge cases, leading to wrong syscall names.
  • x86: fix wrong register names for x86-64 compat 32-bit ABI (IA-32).

Internal changes:

  • Reorganize arch-specific code.
  • Handle SIGINT for more graceful termination.
  • Auto-remap definition locations relative to KDIR for ease of use.

v0.2.1

Improvements:

  • Make syscall symbol preference more consistent (in particular, stop mixing __se_sys_xxx and sys_xxx when possible).
  • Achieve W3C compliance for HTML output format.

Bug fixes:

  • x86: correct wrong syscall numbers for x32 ABI, they should all be ORed with 0x40000000 (__X32_SYSCALL_BIT).

v0.2

Improvements:

  • Improve existing MIPS build and analysis support: use ip27_defconfig for 64-bit for NUMA support and strip more symbol prefixes.
  • Improve dummy syscall implementation detection (x86-64, ARM).

Bug fixes:

  • Fix help text for --arch: building with --arch arm creates an EABI-only kernel.
  • Fix a logging bug that caused not loging syscalls' .origname for not-found locations after grepping.
  • x86: use the right Kconfig option for vm86 and vm86old

v0.1

First release.