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//===-- asan_shadow_setup.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 AddressSanitizer, an address sanity checker.
//
// Set up the shadow memory.
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
// asan_fuchsia.cpp and asan_rtems.cpp have their own
// InitializeShadowMemory implementation.
#if !SANITIZER_FUCHSIA && !SANITIZER_RTEMS
#include "asan_internal.h"
#include "asan_mapping.h"
namespace __asan {
// ---------------------- mmap -------------------- {{{1
// Reserve memory range [beg, end].
// We need to use inclusive range because end+1 may not be representable.
void ReserveShadowMemoryRange(uptr beg, uptr end, const char *name) {
CHECK_EQ((beg % GetMmapGranularity()), 0);
CHECK_EQ(((end + 1) % GetMmapGranularity()), 0);
uptr size = end - beg + 1;
DecreaseTotalMmap(size); // Don't count the shadow against mmap_limit_mb.
if (!MmapFixedSuperNoReserve(beg, size, name)) {
Report(
"ReserveShadowMemoryRange failed while trying to map 0x%zx bytes. "
"Perhaps you're using ulimit -v\n",
size);
Abort();
}
if (common_flags()->use_madv_dontdump) DontDumpShadowMemory(beg, size);
}
static void ProtectGap(uptr addr, uptr size) {
if (!flags()->protect_shadow_gap) {
// The shadow gap is unprotected, so there is a chance that someone
// is actually using this memory. Which means it needs a shadow...
uptr GapShadowBeg = RoundDownTo(MEM_TO_SHADOW(addr), GetPageSizeCached());
uptr GapShadowEnd =
RoundUpTo(MEM_TO_SHADOW(addr + size), GetPageSizeCached()) - 1;
if (Verbosity())
Printf(
"protect_shadow_gap=0:"
" not protecting shadow gap, allocating gap's shadow\n"
"|| `[%p, %p]` || ShadowGap's shadow ||\n",
GapShadowBeg, GapShadowEnd);
ReserveShadowMemoryRange(GapShadowBeg, GapShadowEnd,
"unprotected gap shadow");
return;
}
void *res = MmapFixedNoAccess(addr, size, "shadow gap");
if (addr == (uptr)res) return;
// A few pages at the start of the address space can not be protected.
// But we really want to protect as much as possible, to prevent this memory
// being returned as a result of a non-FIXED mmap().
if (addr == kZeroBaseShadowStart) {
uptr step = GetMmapGranularity();
while (size > step && addr < kZeroBaseMaxShadowStart) {
addr += step;
size -= step;
void *res = MmapFixedNoAccess(addr, size, "shadow gap");
if (addr == (uptr)res) return;
}
}
Report(
"ERROR: Failed to protect the shadow gap. "
"ASan cannot proceed correctly. ABORTING.\n");
DumpProcessMap();
Die();
}
static void MaybeReportLinuxPIEBug() {
#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__aarch64__))
Report("This might be related to ELF_ET_DYN_BASE change in Linux 4.12.\n");
Report(
"See https://github.com/google/sanitizers/issues/856 for possible "
"workarounds.\n");
#endif
}
void InitializeShadowMemory() {
// Set the shadow memory address to uninitialized.
__asan_shadow_memory_dynamic_address = kDefaultShadowSentinel;
uptr shadow_start = kLowShadowBeg;
// Detect if a dynamic shadow address must used and find a available location
// when necessary. When dynamic address is used, the macro |kLowShadowBeg|
// expands to |__asan_shadow_memory_dynamic_address| which is
// |kDefaultShadowSentinel|.
bool full_shadow_is_available = false;
if (shadow_start == kDefaultShadowSentinel) {
__asan_shadow_memory_dynamic_address = 0;
CHECK_EQ(0, kLowShadowBeg);
shadow_start = FindDynamicShadowStart();
if (SANITIZER_LINUX) full_shadow_is_available = true;
}
// Update the shadow memory address (potentially) used by instrumentation.
__asan_shadow_memory_dynamic_address = shadow_start;
if (kLowShadowBeg) shadow_start -= GetMmapGranularity();
if (!full_shadow_is_available)
full_shadow_is_available =
MemoryRangeIsAvailable(shadow_start, kHighShadowEnd);
#if SANITIZER_LINUX && defined(__x86_64__) && defined(_LP64) && \
!ASAN_FIXED_MAPPING
if (!full_shadow_is_available) {
kMidMemBeg = kLowMemEnd < 0x3000000000ULL ? 0x3000000000ULL : 0;
kMidMemEnd = kLowMemEnd < 0x3000000000ULL ? 0x4fffffffffULL : 0;
}
#endif
if (Verbosity()) PrintAddressSpaceLayout();
if (full_shadow_is_available) {
// mmap the low shadow plus at least one page at the left.
if (kLowShadowBeg)
ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
// mmap the high shadow.
ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
// protect the gap.
ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
CHECK_EQ(kShadowGapEnd, kHighShadowBeg - 1);
} else if (kMidMemBeg &&
MemoryRangeIsAvailable(shadow_start, kMidMemBeg - 1) &&
MemoryRangeIsAvailable(kMidMemEnd + 1, kHighShadowEnd)) {
CHECK(kLowShadowBeg != kLowShadowEnd);
// mmap the low shadow plus at least one page at the left.
ReserveShadowMemoryRange(shadow_start, kLowShadowEnd, "low shadow");
// mmap the mid shadow.
ReserveShadowMemoryRange(kMidShadowBeg, kMidShadowEnd, "mid shadow");
// mmap the high shadow.
ReserveShadowMemoryRange(kHighShadowBeg, kHighShadowEnd, "high shadow");
// protect the gaps.
ProtectGap(kShadowGapBeg, kShadowGapEnd - kShadowGapBeg + 1);
ProtectGap(kShadowGap2Beg, kShadowGap2End - kShadowGap2Beg + 1);
ProtectGap(kShadowGap3Beg, kShadowGap3End - kShadowGap3Beg + 1);
} else {
Report(
"Shadow memory range interleaves with an existing memory mapping. "
"ASan cannot proceed correctly. ABORTING.\n");
Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
shadow_start, kHighShadowEnd);
MaybeReportLinuxPIEBug();
DumpProcessMap();
Die();
}
}
} // namespace __asan
#endif // !SANITIZER_FUCHSIA && !SANITIZER_RTEMS
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