forked from OSchip/llvm-project
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===-- esan.cpp ----------------------------------------------------------===//
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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 EfficiencySanitizer, a family of performance tuners.
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//
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// Linux-specific code for the Esan run-time.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_platform.h"
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#if SANITIZER_FREEBSD || SANITIZER_LINUX
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#include "esan.h"
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#include "esan_shadow.h"
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#include "interception/interception.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include <sys/mman.h>
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#include <errno.h>
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namespace __esan {
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void verifyAddressSpace() {
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#if SANITIZER_LINUX && (defined(__x86_64__) || SANITIZER_MIPS64)
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// The kernel determines its mmap base from the stack size limit.
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// Our Linux 64-bit shadow mapping assumes the stack limit is less than a
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// terabyte, which keeps the mmap region above 0x7e00'.
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uptr StackLimit = GetStackSizeLimitInBytes();
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if (StackSizeIsUnlimited() || StackLimit > MaxStackSize) {
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VReport(1, "The stack size limit is beyond the maximum supported.\n"
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"Re-execing with a stack size below 1TB.\n");
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SetStackSizeLimitInBytes(MaxStackSize);
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ReExec();
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}
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#endif
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}
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static bool liesWithinSingleAppRegion(uptr Start, SIZE_T Size) {
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uptr AppStart, AppEnd;
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for (int i = 0; getAppRegion(i, &AppStart, &AppEnd); ++i) {
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if (Start >= AppStart && Start + Size - 1 <= AppEnd) {
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return true;
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}
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}
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return false;
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}
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bool fixMmapAddr(void **Addr, SIZE_T Size, int Flags) {
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if (*Addr) {
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if (!liesWithinSingleAppRegion((uptr)*Addr, Size)) {
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VPrintf(1, "mmap conflict: [%p-%p) is not in an app region\n",
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*Addr, (uptr)*Addr + Size);
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if (Flags & MAP_FIXED) {
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errno = EINVAL;
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return false;
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} else {
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*Addr = 0;
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}
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}
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}
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return true;
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}
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uptr checkMmapResult(uptr Addr, SIZE_T Size) {
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if ((void *)Addr == MAP_FAILED)
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return Addr;
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if (!liesWithinSingleAppRegion(Addr, Size)) {
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// FIXME: attempt to dynamically add this as an app region if it
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// fits our shadow criteria.
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// We could also try to remap somewhere else.
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Printf("ERROR: unsupported mapping at [%p-%p)\n", Addr, Addr+Size);
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Die();
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}
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return Addr;
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}
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} // namespace __esan
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#endif // SANITIZER_FREEBSD || SANITIZER_LINUX
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