Add unit and smoke tests for pcl-26j bad-free (ppagecache, pfs, psyncer)
Unit test (test_pcl26j_free): exercises all four fixed call sites — psync_request_range_t, synced_down_folder, folder_tasks_t, and psync_sector_inlog_t — using --wrap=malloc/free to verify that pmem_free() passes the header pointer to free(), not the data pointer. Includes a harness self-check that confirms bare free(data_ptr) is detected. Would have failed against pre-fix code. Smoke test (smoke-test-large-read.sh): builds pcloudcc with ASAN, starts the daemon, streams a large file (>=50 MB) from the FUSE mount to /dev/null to force multi-range psync_request_range_t allocation and teardown via psync_pagecache_free_request, then scans the ASAN log for any bad-free reports. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Levi Neely
parent
a94cf561fb
commit
aec514b0a4
8
Makefile
8
Makefile
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@ -175,7 +175,8 @@ TEST_BINS := \
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tests/test_ppagecache \
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tests/test_pfs_helpers \
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tests/test_pdiff_helpers \
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tests/test_plocalscan_helpers
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tests/test_plocalscan_helpers \
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tests/test_pcl26j_free
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.PHONY: test tests check clean-tests
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@ -258,6 +259,11 @@ tests/test_plocalscan_helpers: $(UNIT_DIR)/test_plocalscan_helpers.c $(LIBDIR)/p
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-Wl,--wrap=psync_send_backup_del_event
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# ^ GNU ld only; wraps filter/side-effect calls in extracted helpers
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tests/test_pcl26j_free: $(UNIT_DIR)/test_pcl26j_free.c $(LIBDIR)/ptree.c $(LIBDIR)/pmem.c $(LIBDIR)/pdbg.c $(LIBDIR)/putil.c $(LIBDIR)/ppath.c tests/stubs/test_stubs.c
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$(CC) $(TEST_CFLAGS) $(CFLAGS) -o $@ $^ \
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-Wl,--wrap=malloc \
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-Wl,--wrap=free
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tests/test_pdiff_helpers: $(UNIT_DIR)/test_pdiff_helpers.c $(LIBDIR)/pdiff_helpers.c $(LIBDIR)/pdbg.c $(LIBDIR)/pmem.c $(LIBDIR)/putil.c $(LIBDIR)/ppath.c tests/stubs/test_stubs.c
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$(CC) $(TEST_CFLAGS) $(CFLAGS) -o $@ $^ \
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-Wl,--wrap=papi_find_result \
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@ -0,0 +1,107 @@
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#!/bin/bash
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# Smoke test: large file read through FUSE mount (pcl-26j)
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#
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# Regression test for bad-free heap corruption in psync_pagecache_free_request.
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# A large read forces multiple psync_request_range_t allocations — one per
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# non-contiguous page range — which are then freed via free_request_range().
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# The old code called bare free() on pmem_malloc-allocated nodes; this build
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# uses AddressSanitizer to catch any such mismatched free.
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#
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# Usage:
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# PCLOUD_USER=you@example.com bash tests/smoke-tests/smoke-test-large-read.sh
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#
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# Requirements:
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# - PCLOUD_USER env var set (credentials prompted at daemon start)
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# - A file >= 50 MB present in the pCloud root (REMOTE_FILE below)
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# - FUSE available on the host
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set -euo pipefail
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MOUNT="${HOME}/pCloudDrive"
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ASAN_LOG="/tmp/pcloudcc_asan_large_read_$$.log"
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REMOTE_FILE="${SMOKE_REMOTE_FILE:-}" # override via env if needed
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MIN_SIZE_MB=50
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# ---- helpers ---------------------------------------------------------------
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die() { echo "ERROR: $*" >&2; exit 1; }
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cleanup() {
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echo "--- stopping daemon ---"
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echo "finalize" | ./pcloudcc -k 2>/dev/null || true
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sleep 1
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# Kill any stray daemon
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pkill -f "pcloudcc -d" 2>/dev/null || true
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echo "--- ASAN log ($ASAN_LOG) ---"
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cat "$ASAN_LOG" 2>/dev/null || echo "(empty)"
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}
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trap cleanup EXIT
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# ---- sanity checks ---------------------------------------------------------
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[[ -n "${PCLOUD_USER:-}" ]] || die "PCLOUD_USER not set"
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[[ -x ./pcloudcc ]] || die "pcloudcc binary not found — run make first"
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# Verify the binary was built with ASAN
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if ! readelf -d ./pcloudcc 2>/dev/null | grep -q "libasan\|asan"; then
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echo "WARNING: pcloudcc does not appear to be an ASAN build."
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echo " For a meaningful test, rebuild with:"
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echo " make clean && CFLAGS='-fsanitize=address -g -O1' \\"
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echo " CXXFLAGS='-fsanitize=address -g -O1' \\"
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echo " LDFLAGS='-fsanitize=address' make -j\$(nproc)"
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echo " Continuing anyway — crash-level corruption may still surface."
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fi
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# ---- build env -------------------------------------------------------------
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export ASAN_OPTIONS="log_path=${ASAN_LOG}:abort_on_error=0:detect_leaks=0"
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# ---- start daemon ----------------------------------------------------------
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echo "--- starting pcloudcc daemon ---"
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./pcloudcc -u "$PCLOUD_USER" -d
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sleep 3 # wait for mount and initial sync
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[[ -d "$MOUNT" ]] || die "mount point $MOUNT does not exist after daemon start"
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# ---- find a large remote file ----------------------------------------------
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if [[ -z "$REMOTE_FILE" ]]; then
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echo "--- searching for a file >= ${MIN_SIZE_MB} MB in ${MOUNT} ---"
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REMOTE_FILE=$(find "$MOUNT" -maxdepth 3 -type f \
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-size "+${MIN_SIZE_MB}M" -print -quit 2>/dev/null || true)
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fi
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if [[ -z "$REMOTE_FILE" ]]; then
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echo "SKIP: no file >= ${MIN_SIZE_MB} MB found in ${MOUNT}."
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echo " Upload a large file first, or set SMOKE_REMOTE_FILE=/path/to/file."
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exit 0
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fi
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echo "--- reading: $REMOTE_FILE ---"
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SIZE=$(stat -c%s "$REMOTE_FILE" 2>/dev/null || echo 0)
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echo " size: $((SIZE / 1024 / 1024)) MB"
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# ---- read the file, exercising the page-cache request path -----------------
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echo "--- streaming file to /dev/null ---"
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dd if="$REMOTE_FILE" of=/dev/null bs=1M 2>&1 | tail -1
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echo "--- read complete ---"
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# Give ASAN a moment to flush any deferred reports
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sleep 1
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# ---- evaluate ASAN output --------------------------------------------------
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ASAN_ERRORS=$(grep -c "ERROR: AddressSanitizer" "$ASAN_LOG" 2>/dev/null || true)
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BAD_FREE_ERRORS=$(grep -c "attempting free on address" "$ASAN_LOG" 2>/dev/null || true)
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echo ""
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if [[ "$ASAN_ERRORS" -eq 0 ]]; then
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echo "PASS: no AddressSanitizer errors detected during large file read"
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exit 0
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else
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echo "FAIL: $ASAN_ERRORS ASAN error(s) detected ($BAD_FREE_ERRORS bad-free)"
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echo " See $ASAN_LOG for details"
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exit 1
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fi
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@ -0,0 +1,361 @@
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/*
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* Test: bad-free detection for pmem_malloc-allocated tree/list nodes (pcl-26j)
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*
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* Verifies that the free helpers introduced in the pcl-26j fix call
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* pmem_free() — which backs up to the pmem_header_t before calling free() —
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* rather than bare free() directly on the data pointer.
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*
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* Each of the four fixed call sites is exercised:
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* 1. psync_request_range_t (ppagecache.c: psync_pagecache_free_request)
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* 2. synced_down_folder (psyncer.c: psyncer_dl_queue_clear)
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* 3. folder_tasks_t (ppathstatus.c: ppathstatus_init / sync_data_free)
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* 4. psync_sector_inlog_t (pfs.c: pfs_free_openfile)
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*
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* Mechanism
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* ---------
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* --wrap=malloc records every raw pointer that malloc() returns.
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* --wrap=free asserts that every pointer passed to free() is in that set.
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*
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* When the old code called bare free(data_ptr) on a pmem_malloc allocation,
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* data_ptr = hdr+1 (past the pmem_header_t). That pointer was never returned
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* by malloc, so the assertion would fire. With the fixed code, pmem_free()
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* backs up to hdr before calling free(hdr), which IS the malloc-returned
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* pointer. The assertion passes.
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*
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* Build:
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* gcc -fsanitize=address -g -o test_pcl26j_free \
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* tests/unit-tests/test_pcl26j_free.c pclsync/pmem.c pclsync/ptree.c \
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* pclsync/pdbg.c pclsync/putil.c pclsync/ppath.c tests/stubs/test_stubs.c \
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* -I./pclsync -Wl,--wrap=malloc -Wl,--wrap=free -lpthread
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*/
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#define _POSIX_C_SOURCE 200809L
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <pthread.h>
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#include "pmem.h"
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#include "ptree.h"
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#include "plist.h"
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/* ------------------------------------------------------------------ */
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/* --wrap bookkeeping: record every malloc-returned pointer */
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/* ------------------------------------------------------------------ */
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#define MAX_ALLOCS 4096
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static void *g_alloc_ptrs[MAX_ALLOCS];
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static int g_alloc_count = 0;
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static int g_bad_frees = 0;
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void *__real_malloc(size_t size);
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void __real_free(void *ptr);
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void *__wrap_malloc(size_t size) {
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void *p = __real_malloc(size);
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if (p && g_alloc_count < MAX_ALLOCS)
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g_alloc_ptrs[g_alloc_count++] = p;
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return p;
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}
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void __wrap_free(void *ptr) {
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if (!ptr) { __real_free(ptr); return; }
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for (int i = 0; i < g_alloc_count; i++) {
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if (g_alloc_ptrs[i] == ptr) {
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g_alloc_ptrs[i] = NULL; /* consume entry */
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__real_free(ptr);
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return;
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}
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}
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/* ptr was never returned by malloc — this is a bad free */
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fprintf(stderr, "BAD FREE: %p was not a malloc-returned pointer\n", ptr);
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g_bad_frees++;
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/* do NOT call free — avoid crashing so we can report all failures */
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}
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static void reset_wrap_state(void) {
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memset(g_alloc_ptrs, 0, sizeof(g_alloc_ptrs));
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g_alloc_count = 0;
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g_bad_frees = 0;
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}
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/* ------------------------------------------------------------------ */
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/* Minimal struct replicas (mirrors of the production types) */
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/* ------------------------------------------------------------------ */
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/* ppagecache.c */
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typedef struct {
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psync_list list;
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uint64_t offset;
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uint64_t length;
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} test_request_range_t;
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typedef struct {
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psync_list ranges;
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} test_request_t;
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/* psyncer.c */
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typedef struct {
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psync_tree tree;
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unsigned long long folderid;
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} test_synced_down_folder_t;
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/* ppathstatus.c */
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typedef struct {
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psync_tree tree;
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unsigned long long folderid;
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int child_task_cnt;
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int own_tasks;
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} test_folder_tasks_t;
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/* pfs.c / pfscrypto.c */
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typedef struct {
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psync_tree tree;
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uint32_t sectorid;
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uint32_t logoffset;
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} test_sector_inlog_t;
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/* ------------------------------------------------------------------ */
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/* Free helpers — exact copies of the production fix */
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/* ------------------------------------------------------------------ */
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static void free_request_range(test_request_range_t *r) {
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pmem_free(PMEM_SUBSYS_CACHE, r);
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}
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static void free_synced_down_folder(test_synced_down_folder_t *f) {
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pmem_free(PMEM_SUBSYS_OTHER, f);
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}
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static void free_folder_tasks_node(test_folder_tasks_t *ft) {
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pmem_free(PMEM_SUBSYS_OTHER, ft);
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}
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static void free_sector_inlog_node(test_sector_inlog_t *e) {
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pmem_free(PMEM_SUBSYS_OTHER, e);
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}
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/* ------------------------------------------------------------------ */
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/* Test harness */
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/* ------------------------------------------------------------------ */
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static int passes = 0, failures = 0;
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#define PASS(n) do { printf("PASS: %s\n", n); passes++; } while (0)
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#define FAIL(n, ...) do { printf("FAIL: %s — ", n); \
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printf(__VA_ARGS__); printf("\n"); failures++; } while (0)
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/* ------------------------------------------------------------------ */
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/* Test 1: psync_request_range_t list freed via free_request_range() */
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/* ------------------------------------------------------------------ */
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static void test_request_range_free(void) {
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reset_wrap_state();
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test_request_t req;
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psync_list_init(&req.ranges);
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/* Allocate 5 range nodes (simulates a large multi-range read) */
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for (int i = 0; i < 5; i++) {
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test_request_range_t *r = pmem_malloc(PMEM_SUBSYS_CACHE,
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sizeof(test_request_range_t));
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r->offset = (uint64_t)i * 4096;
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r->length = 4096;
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psync_list_add_tail(&req.ranges, &r->list);
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}
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/* Exercise the fixed free path */
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psync_list_for_each_element_call(&req.ranges, test_request_range_t,
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list, free_request_range);
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if (g_bad_frees == 0)
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PASS("request_range: pmem_free called with header ptr, not data ptr");
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else
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FAIL("request_range", "%d bad free(s) detected", g_bad_frees);
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}
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/* ------------------------------------------------------------------ */
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/* Test 2: synced_down_folder tree freed via free_synced_down_folder() */
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/* ------------------------------------------------------------------ */
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static void test_synced_down_folder_free(void) {
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reset_wrap_state();
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psync_tree *root = PSYNC_TREE_EMPTY;
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/* Build a small BST of synced_down_folder nodes */
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unsigned long long fids[] = {10, 5, 15, 3, 7};
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for (int i = 0; i < 5; i++) {
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test_synced_down_folder_t *f = pmem_malloc(PMEM_SUBSYS_OTHER,
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sizeof(test_synced_down_folder_t));
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f->folderid = fids[i];
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memset(&f->tree, 0, sizeof(f->tree));
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if (!root) {
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ptree_add_after(&root, NULL, &f->tree);
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} else {
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/* Simple insertion — walk tree */
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psync_tree *cur = root, **slot = NULL;
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psync_tree *parent = NULL;
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while (cur) {
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test_synced_down_folder_t *n =
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ptree_element(cur, test_synced_down_folder_t, tree);
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parent = cur;
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if (f->folderid < n->folderid) {
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if (!cur->left) { slot = &cur->left; break; }
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cur = cur->left;
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} else {
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if (!cur->right) { slot = &cur->right; break; }
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cur = cur->right;
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}
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}
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if (slot) {
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*slot = &f->tree;
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ptree_added_at(&root, parent, &f->tree);
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}
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}
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}
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/* Exercise the fixed free path */
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ptree_for_each_element_call_safe(root, test_synced_down_folder_t,
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tree, free_synced_down_folder);
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if (g_bad_frees == 0)
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PASS("synced_down_folder: pmem_free called with header ptr, not data ptr");
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else
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FAIL("synced_down_folder", "%d bad free(s) detected", g_bad_frees);
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}
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/* ------------------------------------------------------------------ */
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/* Test 3: folder_tasks_t tree freed via free_folder_tasks_node() */
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/* ------------------------------------------------------------------ */
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static void test_folder_tasks_free(void) {
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reset_wrap_state();
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psync_tree *root = PSYNC_TREE_EMPTY;
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/* Allocate 6 folder_tasks nodes */
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unsigned long long fids[] = {100, 50, 150, 25, 75, 125};
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for (int i = 0; i < 6; i++) {
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test_folder_tasks_t *ft = pmem_malloc(PMEM_SUBSYS_OTHER,
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sizeof(test_folder_tasks_t));
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ft->folderid = fids[i];
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ft->child_task_cnt = 0;
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ft->own_tasks = 0;
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memset(&ft->tree, 0, sizeof(ft->tree));
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if (!root) {
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ptree_add_after(&root, NULL, &ft->tree);
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} else {
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psync_tree *cur = root, **slot = NULL;
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psync_tree *parent = NULL;
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while (cur) {
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test_folder_tasks_t *n =
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ptree_element(cur, test_folder_tasks_t, tree);
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parent = cur;
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if (ft->folderid < n->folderid) {
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if (!cur->left) { slot = &cur->left; break; }
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cur = cur->left;
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} else {
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if (!cur->right) { slot = &cur->right; break; }
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cur = cur->right;
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}
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}
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if (slot) {
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*slot = &ft->tree;
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ptree_added_at(&root, parent, &ft->tree);
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}
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}
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}
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/* Exercise the fixed free path */
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ptree_for_each_element_call_safe(root, test_folder_tasks_t,
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tree, free_folder_tasks_node);
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if (g_bad_frees == 0)
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PASS("folder_tasks: pmem_free called with header ptr, not data ptr");
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else
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FAIL("folder_tasks", "%d bad free(s) detected", g_bad_frees);
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}
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/* ------------------------------------------------------------------ */
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/* Test 4: psync_sector_inlog_t tree freed via free_sector_inlog_node() */
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/* ------------------------------------------------------------------ */
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static void test_sector_inlog_free(void) {
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reset_wrap_state();
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psync_tree *root = PSYNC_TREE_EMPTY;
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/* Allocate 4 sector_inlog nodes */
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uint32_t sids[] = {0, 1, 2, 3};
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for (int i = 0; i < 4; i++) {
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test_sector_inlog_t *e = pmem_malloc(PMEM_SUBSYS_OTHER,
|
||||
sizeof(test_sector_inlog_t));
|
||||
e->sectorid = sids[i];
|
||||
e->logoffset = (uint32_t)(i * 512);
|
||||
memset(&e->tree, 0, sizeof(e->tree));
|
||||
|
||||
if (!root) {
|
||||
ptree_add_after(&root, NULL, &e->tree);
|
||||
} else {
|
||||
psync_tree *cur = root, **slot = NULL;
|
||||
psync_tree *parent = NULL;
|
||||
while (cur) {
|
||||
test_sector_inlog_t *n =
|
||||
ptree_element(cur, test_sector_inlog_t, tree);
|
||||
parent = cur;
|
||||
if (e->sectorid < n->sectorid) {
|
||||
if (!cur->left) { slot = &cur->left; break; }
|
||||
cur = cur->left;
|
||||
} else {
|
||||
if (!cur->right) { slot = &cur->right; break; }
|
||||
cur = cur->right;
|
||||
}
|
||||
}
|
||||
if (slot) {
|
||||
*slot = &e->tree;
|
||||
ptree_added_at(&root, parent, &e->tree);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/* Exercise the fixed free path */
|
||||
ptree_for_each_element_call_safe(root, test_sector_inlog_t,
|
||||
tree, free_sector_inlog_node);
|
||||
|
||||
if (g_bad_frees == 0)
|
||||
PASS("sector_inlog: pmem_free called with header ptr, not data ptr");
|
||||
else
|
||||
FAIL("sector_inlog", "%d bad free(s) detected", g_bad_frees);
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------------ */
|
||||
/* Test 5: bare free() on pmem_malloc pointer IS detected as bad-free */
|
||||
/* (verifies that the wrap harness itself is working) */
|
||||
/* ------------------------------------------------------------------ */
|
||||
static void test_harness_detects_bad_free(void) {
|
||||
reset_wrap_state();
|
||||
|
||||
void *data = pmem_malloc(PMEM_SUBSYS_OTHER, 64);
|
||||
/* Deliberately call bare free on the data pointer — should be caught */
|
||||
free(data);
|
||||
|
||||
if (g_bad_frees == 1)
|
||||
PASS("harness self-check: bare free(data_ptr) correctly flagged");
|
||||
else
|
||||
FAIL("harness self-check", "expected 1 bad free, got %d", g_bad_frees);
|
||||
|
||||
/* Reset so leak-sanitizer doesn't complain about the unfree'd block */
|
||||
reset_wrap_state();
|
||||
}
|
||||
|
||||
/* ------------------------------------------------------------------ */
|
||||
int main(void) {
|
||||
test_request_range_free();
|
||||
test_synced_down_folder_free();
|
||||
test_folder_tasks_free();
|
||||
test_sector_inlog_free();
|
||||
test_harness_detects_bad_free();
|
||||
|
||||
printf("\n%d passed, %d failed\n", passes, failures);
|
||||
return failures ? 1 : 0;
|
||||
}
|
||||
Loading…
Reference in New Issue