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123 lines
4.3 KiB
C++
123 lines
4.3 KiB
C++
//===-- tsan_platform_posix.cc --------------------------------------------===//
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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 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_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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#ifndef SANITIZER_GO
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void InitializeShadowMemory() {
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// Map memory shadow.
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uptr shadow =
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(uptr)MmapFixedNoReserve(kShadowBeg, kShadowEnd - kShadowBeg, "shadow");
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if (shadow != kShadowBeg) {
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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 "
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"to link with -pie (%p, %p).\n", shadow, kShadowBeg);
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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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// FIXME: don't use constants here.
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#if defined(__x86_64__)
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const uptr kMadviseRangeBeg = 0x7f0000000000ull;
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const uptr kMadviseRangeSize = 0x010000000000ull;
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#elif defined(__mips64)
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const uptr kMadviseRangeBeg = 0xff00000000ull;
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const uptr kMadviseRangeSize = 0x0100000000ull;
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#elif defined(__aarch64__)
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const uptr kMadviseRangeBeg = 0x7e00000000ull;
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const uptr kMadviseRangeSize = 0x0100000000ull;
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#endif
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NoHugePagesInRegion(MemToShadow(kMadviseRangeBeg),
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kMadviseRangeSize * kShadowMultiplier);
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// Meta shadow is compressing and we don't flush it,
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// so it makes sense to mark it as NOHUGEPAGE to not over-allocate memory.
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// On one program it reduces memory consumption from 5GB to 2.5GB.
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NoHugePagesInRegion(kMetaShadowBeg, kMetaShadowEnd - kMetaShadowBeg);
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if (common_flags()->use_madv_dontdump)
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DontDumpShadowMemory(kShadowBeg, kShadowEnd - kShadowBeg);
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DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
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kShadowBeg, kShadowEnd,
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(kShadowEnd - kShadowBeg) >> 30);
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// Map meta shadow.
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uptr meta_size = kMetaShadowEnd - kMetaShadowBeg;
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uptr meta =
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(uptr)MmapFixedNoReserve(kMetaShadowBeg, meta_size, "meta shadow");
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if (meta != kMetaShadowBeg) {
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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 "
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"to link with -pie (%p, %p).\n", meta, kMetaShadowBeg);
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Die();
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}
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if (common_flags()->use_madv_dontdump)
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DontDumpShadowMemory(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)MmapNoAccess(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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uptr p, end, prot;
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while (proc_maps.Next(&p, &end, 0, 0, 0, &prot)) {
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if (IsAppMem(p))
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continue;
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if (p >= kHeapMemEnd &&
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p < HeapEnd())
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continue;
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if (prot == 0) // Zero page or mprotected.
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continue;
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if (p >= kVdsoBeg) // vdso
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break;
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Printf("FATAL: ThreadSanitizer: unexpected memory mapping %p-%p\n", p, end);
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Die();
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}
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ProtectRange(kLoAppMemEnd, kShadowBeg);
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ProtectRange(kShadowEnd, kMetaShadowBeg);
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ProtectRange(kMetaShadowEnd, kTraceMemBeg);
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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(kTraceMemBeg, kTraceMemEnd);
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ProtectRange(kTraceMemEnd, kHeapMemBeg);
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ProtectRange(HeapEnd(), kHiAppMemBeg);
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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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