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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
//===-- esan.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 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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