linux: use subdirectory for cache folder (#19406) #15

	name: CI Overlapping-buffer copies

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	overlap-copy-check:
	name: Overlapping dst/src in copy calls
	runs-on: ubuntu-latest
	timeout-minutes: 10

	steps:
	- name: Checkout
	uses: actions/checkout@v3

	- name: Checker self-test
	shell: bash
	run: \|
	set -eu
	# Fixture pass: exact-alias strlcpy and overlapping memcpy
	# element shifts are flagged, memmove is not, unguarded
	# param->param copy helpers called with aliased buffers are
	# flagged while alias-guarded helpers are not, the
	# allowlist suppresses audited same-base copies but can
	# never suppress an exact alias, and stale allowlist
	# entries are reported.
	python3 tools/overlap_copy_check.py --selftest

	- name: Tree check
	shell: bash
	run: \|
	set -eu
	# strlcpy resolves to the fortified __strlcpy_chk on macOS,
	# which aborts on ANY dst/src overlap (bd79aee: typing into
	# the OSK crashed with EXC_BREAKPOINT), and overlapping
	# memcpy is UB everywhere (e942ee2: leaderboard element
	# shift). The portable strlcpy fallback tolerates aliasing
	# on Linux/Windows, so nothing else in CI can catch this
	# class before it ships to Mac users. Audited-intentional
	# same-buffer copies live in tools/overlap_copy_allow.list.
	python3 tools/overlap_copy_check.py

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