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//===-- tsan_platform_posix.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer (TSan), a race detector.
//
// POSIX-specific code.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_POSIX
#include "sanitizer_common/sanitizer_common.h"
#include "sanitizer_common/sanitizer_errno.h"
#include "sanitizer_common/sanitizer_libc.h"
#include "sanitizer_common/sanitizer_procmaps.h"
#include "tsan_platform.h"
#include "tsan_rtl.h"
namespace __tsan {
static const char kShadowMemoryMappingWarning[] =
"FATAL: %s can not madvise shadow region [%zx, %zx] with %s (errno: %d)\n";
static const char kShadowMemoryMappingHint[] =
"HINT: if %s is not supported in your environment, you may set "
"TSAN_OPTIONS=%s=0\n";
static void NoHugePagesInShadow(uptr addr, uptr size) {
SetShadowRegionHugePageMode(addr, size);
}
static void DontDumpShadow(uptr addr, uptr size) {
if (common_flags()->use_madv_dontdump)
if (!DontDumpShadowMemory(addr, size)) {
Printf(kShadowMemoryMappingWarning, SanitizerToolName, addr, addr + size,
"MADV_DONTDUMP", errno);
Printf(kShadowMemoryMappingHint, "MADV_DONTDUMP", "use_madv_dontdump");
Die();
}
}
#if !SANITIZER_GO
void InitializeShadowMemory() {
// Map memory shadow.
if (!MmapFixedNoReserve(ShadowBeg(), ShadowEnd() - ShadowBeg(), "shadow")) {
Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
Die();
}
// This memory range is used for thread stacks and large user mmaps.
// Frequently a thread uses only a small part of stack and similarly
// a program uses a small part of large mmap. On some programs
// we see 20% memory usage reduction without huge pages for this range.
// FIXME: don't use constants here.
#if defined(__x86_64__)
const uptr kMadviseRangeBeg = 0x7f0000000000ull;
const uptr kMadviseRangeSize = 0x010000000000ull;
#elif defined(__mips64)
const uptr kMadviseRangeBeg = 0xff00000000ull;
const uptr kMadviseRangeSize = 0x0100000000ull;
#elif defined(__aarch64__) && defined(__APPLE__)
uptr kMadviseRangeBeg = LoAppMemBeg();
uptr kMadviseRangeSize = LoAppMemEnd() - LoAppMemBeg();
#elif defined(__aarch64__)
uptr kMadviseRangeBeg = 0;
uptr kMadviseRangeSize = 0;
if (vmaSize == 39) {
kMadviseRangeBeg = 0x7d00000000ull;
kMadviseRangeSize = 0x0300000000ull;
} else if (vmaSize == 42) {
kMadviseRangeBeg = 0x3f000000000ull;
kMadviseRangeSize = 0x01000000000ull;
} else {
DCHECK(0);
}
#elif defined(__powerpc64__)
uptr kMadviseRangeBeg = 0;
uptr kMadviseRangeSize = 0;
if (vmaSize == 44) {
kMadviseRangeBeg = 0x0f60000000ull;
kMadviseRangeSize = 0x0010000000ull;
} else if (vmaSize == 46) {
kMadviseRangeBeg = 0x3f0000000000ull;
kMadviseRangeSize = 0x010000000000ull;
} else {
DCHECK(0);
}
#endif
NoHugePagesInShadow(MemToShadow(kMadviseRangeBeg),
kMadviseRangeSize * kShadowMultiplier);
DontDumpShadow(ShadowBeg(), ShadowEnd() - ShadowBeg());
DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
ShadowBeg(), ShadowEnd(),
(ShadowEnd() - ShadowBeg()) >> 30);
// Map meta shadow.
const uptr meta = MetaShadowBeg();
const uptr meta_size = MetaShadowEnd() - meta;
if (!MmapFixedNoReserve(meta, meta_size, "meta shadow")) {
Printf("FATAL: ThreadSanitizer can not mmap the shadow memory\n");
Printf("FATAL: Make sure to compile with -fPIE and to link with -pie.\n");
Die();
}
NoHugePagesInShadow(meta, meta_size);
DontDumpShadow(meta, meta_size);
DPrintf("meta shadow: %zx-%zx (%zuGB)\n",
meta, meta + meta_size, meta_size >> 30);
InitializeShadowMemoryPlatform();
}
static void ProtectRange(uptr beg, uptr end) {
CHECK_LE(beg, end);
if (beg == end)
return;
if (beg != (uptr)MmapFixedNoAccess(beg, end - beg)) {
Printf("FATAL: ThreadSanitizer can not protect [%zx,%zx]\n", beg, end);
Printf("FATAL: Make sure you are not using unlimited stack\n");
Die();
}
}
void CheckAndProtect() {
// Ensure that the binary is indeed compiled with -pie.
MemoryMappingLayout proc_maps(true);
MemoryMappedSegment segment;
while (proc_maps.Next(&segment)) {
if (IsAppMem(segment.start)) continue;
if (segment.start >= HeapMemEnd() && segment.start < HeapEnd()) continue;
if (segment.protection == 0) // Zero page or mprotected.
continue;
if (segment.start >= VdsoBeg()) // vdso
break;
Printf("FATAL: ThreadSanitizer: unexpected memory mapping %p-%p\n",
segment.start, segment.end);
Die();
}
#if defined(__aarch64__) && defined(__APPLE__)
ProtectRange(HeapMemEnd(), ShadowBeg());
ProtectRange(ShadowEnd(), MetaShadowBeg());
ProtectRange(MetaShadowEnd(), TraceMemBeg());
#else
ProtectRange(LoAppMemEnd(), ShadowBeg());
ProtectRange(ShadowEnd(), MetaShadowBeg());
#ifdef TSAN_MID_APP_RANGE
ProtectRange(MetaShadowEnd(), MidAppMemBeg());
ProtectRange(MidAppMemEnd(), TraceMemBeg());
#else
ProtectRange(MetaShadowEnd(), TraceMemBeg());
#endif
// Memory for traces is mapped lazily in MapThreadTrace.
// Protect the whole range for now, so that user does not map something here.
ProtectRange(TraceMemBeg(), TraceMemEnd());
ProtectRange(TraceMemEnd(), HeapMemBeg());
ProtectRange(HeapEnd(), HiAppMemBeg());
#endif
}
#endif
} // namespace __tsan
#endif // SANITIZER_POSIX
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