selftests: tkernel: cover kill rule flush and token edges · Pull Request !976 · OpenCloudOS/OpenCloudOS-Kernel

## Problem

killblock.sh and killprotect.sh only exercise the add/del happy path
of the rule proc interface.  The flush command, the error returns for
removing a missing rule or adding a duplicate one, and the truncation
behaviour for oversized tokens are all untested.

## Root Cause

The scripts were written for the initial feature coverage
(4ac99bbeea81) and grew stress coverage (8d5086aae93c) but never
covered the rule-management edge contracts of whitelist_write() /
blacklist_write().

## Fix

Extend both scripts with contract checks:

- killblock (+6 tests, 12 -> 19):
  - removing a missing whitelist rule is rejected (-ESRCH)
  - a duplicate add is rejected (-EEXIST) and leaves the list
    unchanged
  - an oversized cgroup token (70 chars) is stored truncated to 63
    bytes and removable via its truncated form
  - flush clears the whitelist; rules are gone afterwards (del fails)
  - a rule added after flush works again (SIGTERM passes)
- killprotect (+3 tests, 12 -> 15):
  - removing a missing blacklist rule is rejected
  - an oversized comm token (20 chars) is stored truncated to 15
    bytes and removable via its truncated form
  - flush clears the blacklist and resets the reported rule count,
    after which SIGTERM is delivered again

## Testing

- `sh -n` on both scripts: clean.
- Assertion logic mock-verified with temp files (truncation
  comparisons, flush/empty-list and rule-count checks).
- `make -C tools/testing/selftests/tkernel`: helpers build clean.
- `make dist-check-commit`: commit looks OK.
- `scripts/checkpatch.pl --terse --no-tree`: 0 errors.
- Runtime: executed in QEMU with a 6.6.119+ tencentconfig kernel and
  the two modules loaded: killblock 19/19 ok, killprotect 15/15 ok.

## Risk

none: test-only change, no kernel code touched.

类型	指派人员	状态
审查	zoucao Huang Cun Jianping Liu	已完成 (0/0人)
测试	Jianping Liu	已完成 (0/0人)

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