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