611 lines
18 KiB
C++
611 lines
18 KiB
C++
//===-- msan.cc -----------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of MemorySanitizer.
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//
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// MemorySanitizer runtime.
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//===----------------------------------------------------------------------===//
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#include "msan.h"
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#include "msan_chained_origin_depot.h"
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#include "msan_origin.h"
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#include "msan_thread.h"
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#include "msan_poisoning.h"
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#include "sanitizer_common/sanitizer_atomic.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_flags.h"
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#include "sanitizer_common/sanitizer_flag_parser.h"
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#include "sanitizer_common/sanitizer_libc.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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// ACHTUNG! No system header includes in this file.
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using namespace __sanitizer;
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// Globals.
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static THREADLOCAL int msan_expect_umr = 0;
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static THREADLOCAL int msan_expected_umr_found = 0;
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// Function argument shadow. Each argument starts at the next available 8-byte
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// aligned address.
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u64 __msan_param_tls[kMsanParamTlsSize / sizeof(u64)];
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// Function argument origin. Each argument starts at the same offset as the
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// corresponding shadow in (__msan_param_tls). Slightly weird, but changing this
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// would break compatibility with older prebuilt binaries.
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u32 __msan_param_origin_tls[kMsanParamTlsSize / sizeof(u32)];
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u64 __msan_retval_tls[kMsanRetvalTlsSize / sizeof(u64)];
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u32 __msan_retval_origin_tls;
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u64 __msan_va_arg_tls[kMsanParamTlsSize / sizeof(u64)];
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u64 __msan_va_arg_overflow_size_tls;
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SANITIZER_INTERFACE_ATTRIBUTE
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THREADLOCAL u32 __msan_origin_tls;
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static THREADLOCAL int is_in_symbolizer;
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extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_track_origins;
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int __msan_get_track_origins() {
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return &__msan_track_origins ? __msan_track_origins : 0;
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}
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extern "C" SANITIZER_WEAK_ATTRIBUTE const int __msan_keep_going;
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namespace __msan {
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void EnterSymbolizer() { ++is_in_symbolizer; }
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void ExitSymbolizer() { --is_in_symbolizer; }
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bool IsInSymbolizer() { return is_in_symbolizer; }
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static Flags msan_flags;
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Flags *flags() {
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return &msan_flags;
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}
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int msan_inited = 0;
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bool msan_init_is_running;
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int msan_report_count = 0;
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void (*death_callback)(void);
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// Array of stack origins.
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// FIXME: make it resizable.
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static const uptr kNumStackOriginDescrs = 1024 * 1024;
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static const char *StackOriginDescr[kNumStackOriginDescrs];
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static uptr StackOriginPC[kNumStackOriginDescrs];
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static atomic_uint32_t NumStackOriginDescrs;
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void Flags::SetDefaults() {
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#define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
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#include "msan_flags.inc"
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#undef MSAN_FLAG
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}
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// keep_going is an old name for halt_on_error,
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// and it has inverse meaning.
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class FlagHandlerKeepGoing : public FlagHandlerBase {
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bool *halt_on_error_;
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public:
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explicit FlagHandlerKeepGoing(bool *halt_on_error)
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: halt_on_error_(halt_on_error) {}
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bool Parse(const char *value) final {
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bool tmp;
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FlagHandler<bool> h(&tmp);
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if (!h.Parse(value)) return false;
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*halt_on_error_ = !tmp;
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return true;
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}
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};
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static void RegisterMsanFlags(FlagParser *parser, Flags *f) {
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#define MSAN_FLAG(Type, Name, DefaultValue, Description) \
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RegisterFlag(parser, #Name, Description, &f->Name);
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#include "msan_flags.inc"
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#undef MSAN_FLAG
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FlagHandlerKeepGoing *fh_keep_going = new (FlagParser::Alloc) // NOLINT
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FlagHandlerKeepGoing(&f->halt_on_error);
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parser->RegisterHandler("keep_going", fh_keep_going,
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"deprecated, use halt_on_error");
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}
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static void InitializeFlags() {
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Flags *f = flags();
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FlagParser parser;
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RegisterMsanFlags(&parser, f);
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RegisterCommonFlags(&parser);
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SetCommonFlagsDefaults();
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{
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CommonFlags cf;
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cf.CopyFrom(*common_flags());
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cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
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cf.malloc_context_size = 20;
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cf.handle_ioctl = true;
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// FIXME: test and enable.
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cf.check_printf = false;
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cf.intercept_tls_get_addr = true;
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OverrideCommonFlags(cf);
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}
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f->SetDefaults();
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// Override from user-specified string.
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if (__msan_default_options)
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parser.ParseString(__msan_default_options());
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const char *msan_options = GetEnv("MSAN_OPTIONS");
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parser.ParseString(msan_options);
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VPrintf(1, "MSAN_OPTIONS: %s\n", msan_options ? msan_options : "<empty>");
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SetVerbosity(common_flags()->verbosity);
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if (Verbosity()) ReportUnrecognizedFlags();
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if (common_flags()->help) parser.PrintFlagDescriptions();
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// Check flag values:
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if (f->exit_code < 0 || f->exit_code > 127) {
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Printf("Exit code not in [0, 128) range: %d\n", f->exit_code);
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Die();
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}
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if (f->origin_history_size < 0 ||
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f->origin_history_size > Origin::kMaxDepth) {
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Printf(
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"Origin history size invalid: %d. Must be 0 (unlimited) or in [1, %d] "
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"range.\n",
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f->origin_history_size, Origin::kMaxDepth);
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Die();
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}
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// Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
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// StackDepotHandle::inc_use_count_unsafe.
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if (f->origin_history_per_stack_limit < 0 ||
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f->origin_history_per_stack_limit > kStackDepotMaxUseCount / 2) {
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Printf(
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"Origin per-stack limit invalid: %d. Must be 0 (unlimited) or in [1, "
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"%d] range.\n",
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f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
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Die();
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}
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if (f->store_context_size < 1) f->store_context_size = 1;
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}
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void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
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bool request_fast_unwind) {
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MsanThread *t = GetCurrentThread();
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if (!t || !StackTrace::WillUseFastUnwind(request_fast_unwind)) {
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// Block reports from our interceptors during _Unwind_Backtrace.
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SymbolizerScope sym_scope;
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return stack->Unwind(max_s, pc, bp, 0, 0, 0, request_fast_unwind);
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}
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stack->Unwind(max_s, pc, bp, 0, t->stack_top(), t->stack_bottom(),
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request_fast_unwind);
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}
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void PrintWarning(uptr pc, uptr bp) {
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PrintWarningWithOrigin(pc, bp, __msan_origin_tls);
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}
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void PrintWarningWithOrigin(uptr pc, uptr bp, u32 origin) {
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if (msan_expect_umr) {
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// Printf("Expected UMR\n");
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__msan_origin_tls = origin;
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msan_expected_umr_found = 1;
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return;
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}
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++msan_report_count;
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GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
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u32 report_origin =
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(__msan_get_track_origins() && Origin::isValidId(origin)) ? origin : 0;
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ReportUMR(&stack, report_origin);
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if (__msan_get_track_origins() && !Origin::isValidId(origin)) {
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Printf(
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" ORIGIN: invalid (%x). Might be a bug in MemorySanitizer origin "
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"tracking.\n This could still be a bug in your code, too!\n",
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origin);
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}
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}
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void UnpoisonParam(uptr n) {
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internal_memset(__msan_param_tls, 0, n * sizeof(*__msan_param_tls));
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}
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// Backup MSan runtime TLS state.
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// Implementation must be async-signal-safe.
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// Instances of this class may live on the signal handler stack, and data size
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// may be an issue.
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void ScopedThreadLocalStateBackup::Backup() {
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va_arg_overflow_size_tls = __msan_va_arg_overflow_size_tls;
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}
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void ScopedThreadLocalStateBackup::Restore() {
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// A lame implementation that only keeps essential state and resets the rest.
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__msan_va_arg_overflow_size_tls = va_arg_overflow_size_tls;
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internal_memset(__msan_param_tls, 0, sizeof(__msan_param_tls));
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internal_memset(__msan_retval_tls, 0, sizeof(__msan_retval_tls));
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internal_memset(__msan_va_arg_tls, 0, sizeof(__msan_va_arg_tls));
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if (__msan_get_track_origins()) {
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internal_memset(&__msan_retval_origin_tls, 0,
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sizeof(__msan_retval_origin_tls));
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internal_memset(__msan_param_origin_tls, 0,
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sizeof(__msan_param_origin_tls));
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}
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}
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void UnpoisonThreadLocalState() {
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}
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const char *GetStackOriginDescr(u32 id, uptr *pc) {
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CHECK_LT(id, kNumStackOriginDescrs);
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if (pc) *pc = StackOriginPC[id];
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return StackOriginDescr[id];
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}
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u32 ChainOrigin(u32 id, StackTrace *stack) {
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MsanThread *t = GetCurrentThread();
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if (t && t->InSignalHandler())
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return id;
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Origin o = Origin::FromRawId(id);
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stack->tag = StackTrace::TAG_UNKNOWN;
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Origin chained = Origin::CreateChainedOrigin(o, stack);
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return chained.raw_id();
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}
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} // namespace __msan
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// Interface.
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using namespace __msan;
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#define MSAN_MAYBE_WARNING(type, size) \
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void __msan_maybe_warning_##size(type s, u32 o) { \
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GET_CALLER_PC_BP_SP; \
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(void) sp; \
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if (UNLIKELY(s)) { \
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PrintWarningWithOrigin(pc, bp, o); \
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if (__msan::flags()->halt_on_error) { \
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Printf("Exiting\n"); \
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Die(); \
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} \
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} \
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}
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MSAN_MAYBE_WARNING(u8, 1)
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MSAN_MAYBE_WARNING(u16, 2)
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MSAN_MAYBE_WARNING(u32, 4)
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MSAN_MAYBE_WARNING(u64, 8)
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#define MSAN_MAYBE_STORE_ORIGIN(type, size) \
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void __msan_maybe_store_origin_##size(type s, void *p, u32 o) { \
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if (UNLIKELY(s)) { \
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if (__msan_get_track_origins() > 1) { \
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GET_CALLER_PC_BP_SP; \
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(void) sp; \
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GET_STORE_STACK_TRACE_PC_BP(pc, bp); \
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o = ChainOrigin(o, &stack); \
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} \
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*(u32 *)MEM_TO_ORIGIN((uptr)p & ~3UL) = o; \
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} \
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}
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MSAN_MAYBE_STORE_ORIGIN(u8, 1)
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MSAN_MAYBE_STORE_ORIGIN(u16, 2)
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MSAN_MAYBE_STORE_ORIGIN(u32, 4)
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MSAN_MAYBE_STORE_ORIGIN(u64, 8)
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void __msan_warning() {
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GET_CALLER_PC_BP_SP;
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(void)sp;
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PrintWarning(pc, bp);
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if (__msan::flags()->halt_on_error) {
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if (__msan::flags()->print_stats)
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ReportStats();
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Printf("Exiting\n");
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Die();
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}
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}
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void __msan_warning_noreturn() {
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GET_CALLER_PC_BP_SP;
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(void)sp;
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PrintWarning(pc, bp);
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if (__msan::flags()->print_stats)
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ReportStats();
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Printf("Exiting\n");
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Die();
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}
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void __msan_init() {
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CHECK(!msan_init_is_running);
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if (msan_inited) return;
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msan_init_is_running = 1;
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SanitizerToolName = "MemorySanitizer";
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SetDieCallback(MsanDie);
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InitTlsSize();
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InitializeFlags();
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__sanitizer_set_report_path(common_flags()->log_path);
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InitializeInterceptors();
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InstallAtExitHandler(); // Needs __cxa_atexit interceptor.
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if (MSAN_REPLACE_OPERATORS_NEW_AND_DELETE)
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ReplaceOperatorsNewAndDelete();
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DisableCoreDumperIfNecessary();
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if (StackSizeIsUnlimited()) {
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VPrintf(1, "Unlimited stack, doing reexec\n");
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// A reasonably large stack size. It is bigger than the usual 8Mb, because,
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// well, the program could have been run with unlimited stack for a reason.
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SetStackSizeLimitInBytes(32 * 1024 * 1024);
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ReExec();
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}
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__msan_clear_on_return();
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if (__msan_get_track_origins())
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VPrintf(1, "msan_track_origins\n");
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if (!InitShadow(/* map_shadow */ true, __msan_get_track_origins())) {
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Printf("FATAL: MemorySanitizer can not mmap the shadow memory.\n");
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Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
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Printf("FATAL: Disabling ASLR is known to cause this error.\n");
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Printf("FATAL: If running under GDB, try "
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"'set disable-randomization off'.\n");
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DumpProcessMap();
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Die();
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}
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Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
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InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
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MsanTSDInit(MsanTSDDtor);
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MsanThread *main_thread = MsanThread::Create(0, 0);
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SetCurrentThread(main_thread);
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main_thread->ThreadStart();
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VPrintf(1, "MemorySanitizer init done\n");
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msan_init_is_running = 0;
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msan_inited = 1;
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}
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void __msan_set_exit_code(int exit_code) {
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flags()->exit_code = exit_code;
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}
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void __msan_set_keep_going(int keep_going) {
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flags()->halt_on_error = !keep_going;
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}
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void __msan_set_expect_umr(int expect_umr) {
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if (expect_umr) {
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msan_expected_umr_found = 0;
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} else if (!msan_expected_umr_found) {
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GET_CALLER_PC_BP_SP;
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(void)sp;
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GET_FATAL_STACK_TRACE_PC_BP(pc, bp);
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ReportExpectedUMRNotFound(&stack);
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Die();
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}
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msan_expect_umr = expect_umr;
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}
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void __msan_print_shadow(const void *x, uptr size) {
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if (!MEM_IS_APP(x)) {
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Printf("Not a valid application address: %p\n", x);
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return;
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}
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DescribeMemoryRange(x, size);
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}
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void __msan_dump_shadow(const void *x, uptr size) {
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if (!MEM_IS_APP(x)) {
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Printf("Not a valid application address: %p\n", x);
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return;
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}
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unsigned char *s = (unsigned char*)MEM_TO_SHADOW(x);
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for (uptr i = 0; i < size; i++) {
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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Printf("%x%x ", s[i] & 0xf, s[i] >> 4);
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#else
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Printf("%x%x ", s[i] >> 4, s[i] & 0xf);
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#endif
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}
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Printf("\n");
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}
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sptr __msan_test_shadow(const void *x, uptr size) {
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if (!MEM_IS_APP(x)) return -1;
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unsigned char *s = (unsigned char *)MEM_TO_SHADOW((uptr)x);
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for (uptr i = 0; i < size; ++i)
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if (s[i])
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return i;
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return -1;
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}
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void __msan_check_mem_is_initialized(const void *x, uptr size) {
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if (!__msan::flags()->report_umrs) return;
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sptr offset = __msan_test_shadow(x, size);
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if (offset < 0)
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return;
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GET_CALLER_PC_BP_SP;
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(void)sp;
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ReportUMRInsideAddressRange(__func__, x, size, offset);
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__msan::PrintWarningWithOrigin(pc, bp,
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__msan_get_origin(((const char *)x) + offset));
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if (__msan::flags()->halt_on_error) {
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Printf("Exiting\n");
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Die();
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}
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}
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int __msan_set_poison_in_malloc(int do_poison) {
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int old = flags()->poison_in_malloc;
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flags()->poison_in_malloc = do_poison;
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return old;
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}
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int __msan_has_dynamic_component() { return false; }
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NOINLINE
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void __msan_clear_on_return() {
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__msan_param_tls[0] = 0;
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}
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void __msan_partial_poison(const void* data, void* shadow, uptr size) {
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internal_memcpy((void*)MEM_TO_SHADOW((uptr)data), shadow, size);
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}
|
|
|
|
void __msan_load_unpoisoned(void *src, uptr size, void *dst) {
|
|
internal_memcpy(dst, src, size);
|
|
__msan_unpoison(dst, size);
|
|
}
|
|
|
|
void __msan_set_origin(const void *a, uptr size, u32 origin) {
|
|
if (__msan_get_track_origins()) SetOrigin(a, size, origin);
|
|
}
|
|
|
|
// 'descr' is created at compile time and contains '----' in the beginning.
|
|
// When we see descr for the first time we replace '----' with a uniq id
|
|
// and set the origin to (id | (31-th bit)).
|
|
void __msan_set_alloca_origin(void *a, uptr size, char *descr) {
|
|
__msan_set_alloca_origin4(a, size, descr, 0);
|
|
}
|
|
|
|
void __msan_set_alloca_origin4(void *a, uptr size, char *descr, uptr pc) {
|
|
static const u32 dash = '-';
|
|
static const u32 first_timer =
|
|
dash + (dash << 8) + (dash << 16) + (dash << 24);
|
|
u32 *id_ptr = (u32*)descr;
|
|
bool print = false; // internal_strstr(descr + 4, "AllocaTOTest") != 0;
|
|
u32 id = *id_ptr;
|
|
if (id == first_timer) {
|
|
u32 idx = atomic_fetch_add(&NumStackOriginDescrs, 1, memory_order_relaxed);
|
|
CHECK_LT(idx, kNumStackOriginDescrs);
|
|
StackOriginDescr[idx] = descr + 4;
|
|
StackOriginPC[idx] = pc;
|
|
id = Origin::CreateStackOrigin(idx).raw_id();
|
|
*id_ptr = id;
|
|
if (print)
|
|
Printf("First time: idx=%d id=%d %s %p \n", idx, id, descr + 4, pc);
|
|
}
|
|
if (print)
|
|
Printf("__msan_set_alloca_origin: descr=%s id=%x\n", descr + 4, id);
|
|
__msan_set_origin(a, size, id);
|
|
}
|
|
|
|
u32 __msan_chain_origin(u32 id) {
|
|
GET_CALLER_PC_BP_SP;
|
|
(void)sp;
|
|
GET_STORE_STACK_TRACE_PC_BP(pc, bp);
|
|
return ChainOrigin(id, &stack);
|
|
}
|
|
|
|
u32 __msan_get_origin(const void *a) {
|
|
if (!__msan_get_track_origins()) return 0;
|
|
uptr x = (uptr)a;
|
|
uptr aligned = x & ~3ULL;
|
|
uptr origin_ptr = MEM_TO_ORIGIN(aligned);
|
|
return *(u32*)origin_ptr;
|
|
}
|
|
|
|
u32 __msan_get_umr_origin() {
|
|
return __msan_origin_tls;
|
|
}
|
|
|
|
u16 __sanitizer_unaligned_load16(const uu16 *p) {
|
|
__msan_retval_tls[0] = *(uu16 *)MEM_TO_SHADOW((uptr)p);
|
|
if (__msan_get_track_origins())
|
|
__msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
|
|
return *p;
|
|
}
|
|
u32 __sanitizer_unaligned_load32(const uu32 *p) {
|
|
__msan_retval_tls[0] = *(uu32 *)MEM_TO_SHADOW((uptr)p);
|
|
if (__msan_get_track_origins())
|
|
__msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
|
|
return *p;
|
|
}
|
|
u64 __sanitizer_unaligned_load64(const uu64 *p) {
|
|
__msan_retval_tls[0] = *(uu64 *)MEM_TO_SHADOW((uptr)p);
|
|
if (__msan_get_track_origins())
|
|
__msan_retval_origin_tls = GetOriginIfPoisoned((uptr)p, sizeof(*p));
|
|
return *p;
|
|
}
|
|
void __sanitizer_unaligned_store16(uu16 *p, u16 x) {
|
|
u16 s = __msan_param_tls[1];
|
|
*(uu16 *)MEM_TO_SHADOW((uptr)p) = s;
|
|
if (s && __msan_get_track_origins())
|
|
if (uu32 o = __msan_param_origin_tls[2])
|
|
SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
|
|
*p = x;
|
|
}
|
|
void __sanitizer_unaligned_store32(uu32 *p, u32 x) {
|
|
u32 s = __msan_param_tls[1];
|
|
*(uu32 *)MEM_TO_SHADOW((uptr)p) = s;
|
|
if (s && __msan_get_track_origins())
|
|
if (uu32 o = __msan_param_origin_tls[2])
|
|
SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
|
|
*p = x;
|
|
}
|
|
void __sanitizer_unaligned_store64(uu64 *p, u64 x) {
|
|
u64 s = __msan_param_tls[1];
|
|
*(uu64 *)MEM_TO_SHADOW((uptr)p) = s;
|
|
if (s && __msan_get_track_origins())
|
|
if (uu32 o = __msan_param_origin_tls[2])
|
|
SetOriginIfPoisoned((uptr)p, (uptr)&s, sizeof(s), o);
|
|
*p = x;
|
|
}
|
|
|
|
void __msan_set_death_callback(void (*callback)(void)) {
|
|
death_callback = callback;
|
|
}
|
|
|
|
#if !SANITIZER_SUPPORTS_WEAK_HOOKS
|
|
extern "C" {
|
|
SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
|
|
const char* __msan_default_options() { return ""; }
|
|
} // extern "C"
|
|
#endif
|
|
|
|
extern "C" {
|
|
SANITIZER_INTERFACE_ATTRIBUTE
|
|
void __sanitizer_print_stack_trace() {
|
|
GET_FATAL_STACK_TRACE_PC_BP(StackTrace::GetCurrentPc(), GET_CURRENT_FRAME());
|
|
stack.Print();
|
|
}
|
|
} // extern "C"
|