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277 lines
9.2 KiB
C++
277 lines
9.2 KiB
C++
//===-- sanitizer_coverage_libcdep_new.cpp --------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Sanitizer Coverage Controller for Trace PC Guard.
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#include "sanitizer_platform.h"
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#if !SANITIZER_FUCHSIA
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#include "sancov_flags.h"
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#include "sanitizer_allocator_internal.h"
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#include "sanitizer_atomic.h"
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#include "sanitizer_common.h"
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#include "sanitizer_file.h"
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using namespace __sanitizer;
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using AddressRange = LoadedModule::AddressRange;
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namespace __sancov {
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namespace {
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static const u64 Magic64 = 0xC0BFFFFFFFFFFF64ULL;
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static const u64 Magic32 = 0xC0BFFFFFFFFFFF32ULL;
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static const u64 Magic = SANITIZER_WORDSIZE == 64 ? Magic64 : Magic32;
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static fd_t OpenFile(const char* path) {
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error_t err;
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fd_t fd = OpenFile(path, WrOnly, &err);
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if (fd == kInvalidFd)
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Report("SanitizerCoverage: failed to open %s for writing (reason: %d)\n",
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path, err);
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return fd;
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}
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static void GetCoverageFilename(char* path, const char* name,
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const char* extension) {
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CHECK(name);
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internal_snprintf(path, kMaxPathLength, "%s/%s.%zd.%s",
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common_flags()->coverage_dir, name, internal_getpid(),
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extension);
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}
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static void WriteModuleCoverage(char* file_path, const char* module_name,
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const uptr* pcs, uptr len) {
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GetCoverageFilename(file_path, StripModuleName(module_name), "sancov");
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fd_t fd = OpenFile(file_path);
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WriteToFile(fd, &Magic, sizeof(Magic));
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WriteToFile(fd, pcs, len * sizeof(*pcs));
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CloseFile(fd);
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Printf("SanitizerCoverage: %s: %zd PCs written\n", file_path, len);
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}
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static void SanitizerDumpCoverage(const uptr* unsorted_pcs, uptr len) {
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if (!len) return;
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char* file_path = static_cast<char*>(InternalAlloc(kMaxPathLength));
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char* module_name = static_cast<char*>(InternalAlloc(kMaxPathLength));
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uptr* pcs = static_cast<uptr*>(InternalAlloc(len * sizeof(uptr)));
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internal_memcpy(pcs, unsorted_pcs, len * sizeof(uptr));
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Sort(pcs, len);
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bool module_found = false;
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uptr last_base = 0;
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uptr module_start_idx = 0;
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for (uptr i = 0; i < len; ++i) {
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const uptr pc = pcs[i];
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if (!pc) continue;
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if (!__sanitizer_get_module_and_offset_for_pc(pc, nullptr, 0, &pcs[i])) {
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Printf("ERROR: unknown pc 0x%zx (may happen if dlclose is used)\n", pc);
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continue;
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}
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uptr module_base = pc - pcs[i];
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if (module_base != last_base || !module_found) {
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if (module_found) {
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WriteModuleCoverage(file_path, module_name, &pcs[module_start_idx],
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i - module_start_idx);
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}
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last_base = module_base;
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module_start_idx = i;
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module_found = true;
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__sanitizer_get_module_and_offset_for_pc(pc, module_name, kMaxPathLength,
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&pcs[i]);
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}
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}
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if (module_found) {
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WriteModuleCoverage(file_path, module_name, &pcs[module_start_idx],
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len - module_start_idx);
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}
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InternalFree(file_path);
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InternalFree(module_name);
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InternalFree(pcs);
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}
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// Collects trace-pc guard coverage.
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// This class relies on zero-initialization.
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class TracePcGuardController {
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public:
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void Initialize() {
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CHECK(!initialized);
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initialized = true;
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InitializeSancovFlags();
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pc_vector.Initialize(0);
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}
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void InitTracePcGuard(u32* start, u32* end) {
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if (!initialized) Initialize();
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CHECK(!*start);
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CHECK_NE(start, end);
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u32 i = pc_vector.size();
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for (u32* p = start; p < end; p++) *p = ++i;
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pc_vector.resize(i);
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}
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void TracePcGuard(u32* guard, uptr pc) {
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u32 idx = *guard;
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if (!idx) return;
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// we start indices from 1.
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atomic_uintptr_t* pc_ptr =
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reinterpret_cast<atomic_uintptr_t*>(&pc_vector[idx - 1]);
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if (atomic_load(pc_ptr, memory_order_relaxed) == 0)
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atomic_store(pc_ptr, pc, memory_order_relaxed);
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}
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void Reset() {
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internal_memset(&pc_vector[0], 0, sizeof(pc_vector[0]) * pc_vector.size());
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}
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void Dump() {
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if (!initialized || !common_flags()->coverage) return;
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__sanitizer_dump_coverage(pc_vector.data(), pc_vector.size());
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}
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private:
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bool initialized;
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InternalMmapVectorNoCtor<uptr> pc_vector;
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};
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static TracePcGuardController pc_guard_controller;
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// A basic default implementation of callbacks for
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// -fsanitize-coverage=inline-8bit-counters,pc-table.
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// Use TOOL_OPTIONS (UBSAN_OPTIONS, etc) to dump the coverage data:
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// * cov_8bit_counters_out=PATH to dump the 8bit counters.
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// * cov_pcs_out=PATH to dump the pc table.
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//
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// Most users will still need to define their own callbacks for greater
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// flexibility.
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namespace SingletonCounterCoverage {
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static char *counters_beg, *counters_end;
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static const uptr *pcs_beg, *pcs_end;
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static void DumpCoverage() {
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const char* file_path = common_flags()->cov_8bit_counters_out;
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if (file_path && internal_strlen(file_path)) {
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fd_t fd = OpenFile(file_path);
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FileCloser file_closer(fd);
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uptr size = counters_end - counters_beg;
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WriteToFile(fd, counters_beg, size);
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if (common_flags()->verbosity)
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__sanitizer::Printf("cov_8bit_counters_out: written %zd bytes to %s\n",
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size, file_path);
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}
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file_path = common_flags()->cov_pcs_out;
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if (file_path && internal_strlen(file_path)) {
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fd_t fd = OpenFile(file_path);
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FileCloser file_closer(fd);
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uptr size = (pcs_end - pcs_beg) * sizeof(uptr);
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WriteToFile(fd, pcs_beg, size);
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if (common_flags()->verbosity)
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__sanitizer::Printf("cov_pcs_out: written %zd bytes to %s\n", size,
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file_path);
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}
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}
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static void Cov8bitCountersInit(char* beg, char* end) {
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counters_beg = beg;
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counters_end = end;
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Atexit(DumpCoverage);
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}
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static void CovPcsInit(const uptr* beg, const uptr* end) {
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pcs_beg = beg;
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pcs_end = end;
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}
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} // namespace SingletonCounterCoverage
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} // namespace
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} // namespace __sancov
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namespace __sanitizer {
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void InitializeCoverage(bool enabled, const char *dir) {
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static bool coverage_enabled = false;
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if (coverage_enabled)
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return; // May happen if two sanitizer enable coverage in the same process.
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coverage_enabled = enabled;
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Atexit(__sanitizer_cov_dump);
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AddDieCallback(__sanitizer_cov_dump);
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}
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} // namespace __sanitizer
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_dump_coverage(const uptr* pcs,
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uptr len) {
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return __sancov::SanitizerDumpCoverage(pcs, len);
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}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_guard, u32* guard) {
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if (!*guard) return;
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__sancov::pc_guard_controller.TracePcGuard(guard, GET_CALLER_PC() - 1);
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}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_guard_init,
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u32* start, u32* end) {
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if (start == end || *start) return;
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__sancov::pc_guard_controller.InitTracePcGuard(start, end);
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}
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SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_dump_trace_pc_guard_coverage() {
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__sancov::pc_guard_controller.Dump();
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}
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SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() {
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__sanitizer_dump_trace_pc_guard_coverage();
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}
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SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_reset() {
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__sancov::pc_guard_controller.Reset();
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}
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// Default implementations (weak).
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// Either empty or very simple.
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// Most users should redefine them.
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp1, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp2, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp4, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_cmp8, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_const_cmp1, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_const_cmp2, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_const_cmp4, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_const_cmp8, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_switch, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_div4, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_div8, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_gep, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_trace_pc_indir, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_8bit_counters_init,
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char* start, char* end) {
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__sancov::SingletonCounterCoverage::Cov8bitCountersInit(start, end);
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}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_bool_flag_init, void) {}
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SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_cov_pcs_init, const uptr* beg,
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const uptr* end) {
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__sancov::SingletonCounterCoverage::CovPcsInit(beg, end);
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}
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} // extern "C"
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// Weak definition for code instrumented with -fsanitize-coverage=stack-depth
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// and later linked with code containing a strong definition.
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// E.g., -fsanitize=fuzzer-no-link
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE uptr __sancov_lowest_stack;
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#endif // !SANITIZER_FUCHSIA
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