127 lines
4.4 KiB
C++
127 lines
4.4 KiB
C++
//===-- tsan_platform_posix.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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//
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// This file is a part of ThreadSanitizer (TSan), a race detector.
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//
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// POSIX-specific code.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_POSIX
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_errno.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 "tsan_platform.h"
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#include "tsan_rtl.h"
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namespace __tsan {
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static const char kShadowMemoryMappingWarning[] =
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"FATAL: %s can not madvise shadow region [%zx, %zx] with %s (errno: %d)\n";
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static const char kShadowMemoryMappingHint[] =
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"HINT: if %s is not supported in your environment, you may set "
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"TSAN_OPTIONS=%s=0\n";
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static void DontDumpShadow(uptr addr, uptr size) {
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if (common_flags()->use_madv_dontdump)
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if (!DontDumpShadowMemory(addr, size)) {
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Printf(kShadowMemoryMappingWarning, SanitizerToolName, addr, addr + size,
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"MADV_DONTDUMP", errno);
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Printf(kShadowMemoryMappingHint, "MADV_DONTDUMP", "use_madv_dontdump");
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Die();
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}
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}
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#if !SANITIZER_GO
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void InitializeShadowMemory() {
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// Map memory shadow.
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if (!MmapFixedSuperNoReserve(ShadowBeg(), ShadowEnd() - ShadowBeg(),
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"shadow")) {
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Printf("FATAL: ThreadSanitizer 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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Die();
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}
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// This memory range is used for thread stacks and large user mmaps.
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// Frequently a thread uses only a small part of stack and similarly
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// a program uses a small part of large mmap. On some programs
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// we see 20% memory usage reduction without huge pages for this range.
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DontDumpShadow(ShadowBeg(), ShadowEnd() - ShadowBeg());
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DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
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ShadowBeg(), ShadowEnd(),
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(ShadowEnd() - ShadowBeg()) >> 30);
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// Map meta shadow.
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const uptr meta = MetaShadowBeg();
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const uptr meta_size = MetaShadowEnd() - meta;
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if (!MmapFixedSuperNoReserve(meta, meta_size, "meta shadow")) {
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Printf("FATAL: ThreadSanitizer 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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Die();
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}
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DontDumpShadow(meta, meta_size);
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DPrintf("meta shadow: %zx-%zx (%zuGB)\n",
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meta, meta + meta_size, meta_size >> 30);
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InitializeShadowMemoryPlatform();
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}
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static void ProtectRange(uptr beg, uptr end) {
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CHECK_LE(beg, end);
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if (beg == end)
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return;
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if (beg != (uptr)MmapFixedNoAccess(beg, end - beg)) {
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Printf("FATAL: ThreadSanitizer can not protect [%zx,%zx]\n", beg, end);
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Printf("FATAL: Make sure you are not using unlimited stack\n");
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Die();
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}
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}
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void CheckAndProtect() {
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// Ensure that the binary is indeed compiled with -pie.
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MemoryMappingLayout proc_maps(true);
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MemoryMappedSegment segment;
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while (proc_maps.Next(&segment)) {
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if (IsAppMem(segment.start)) continue;
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if (segment.start >= HeapMemEnd() && segment.start < HeapEnd()) continue;
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if (segment.protection == 0) // Zero page or mprotected.
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continue;
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if (segment.start >= VdsoBeg()) // vdso
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break;
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Printf("FATAL: ThreadSanitizer: unexpected memory mapping %p-%p\n",
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segment.start, segment.end);
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Die();
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}
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#if defined(__aarch64__) && defined(__APPLE__)
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ProtectRange(HeapMemEnd(), ShadowBeg());
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ProtectRange(ShadowEnd(), MetaShadowBeg());
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ProtectRange(MetaShadowEnd(), TraceMemBeg());
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#else
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ProtectRange(LoAppMemEnd(), ShadowBeg());
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ProtectRange(ShadowEnd(), MetaShadowBeg());
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#ifdef TSAN_MID_APP_RANGE
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ProtectRange(MetaShadowEnd(), MidAppMemBeg());
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ProtectRange(MidAppMemEnd(), TraceMemBeg());
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#else
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ProtectRange(MetaShadowEnd(), TraceMemBeg());
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#endif
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// Memory for traces is mapped lazily in MapThreadTrace.
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// Protect the whole range for now, so that user does not map something here.
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ProtectRange(TraceMemBeg(), TraceMemEnd());
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ProtectRange(TraceMemEnd(), HeapMemBeg());
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ProtectRange(HeapEnd(), HiAppMemBeg());
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#endif
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}
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#endif
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} // namespace __tsan
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#endif // SANITIZER_POSIX
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