forked from OSchip/llvm-project
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
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//===-- msan_linux.cc -----------------------------------------------------===//
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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 MemorySanitizer.
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//
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// Linux-specific code.
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//===----------------------------------------------------------------------===//
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#ifdef __linux__
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#include "msan.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <unistd.h>
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#include <unwind.h>
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#include <execinfo.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_procmaps.h"
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namespace __msan {
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static const uptr kMemBeg = 0x600000000000;
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static const uptr kMemEnd = 0x7fffffffffff;
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static const uptr kShadowBeg = MEM_TO_SHADOW(kMemBeg);
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static const uptr kShadowEnd = MEM_TO_SHADOW(kMemEnd);
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static const uptr kBad1Beg = 0x100000000; // 4G
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static const uptr kBad1End = kShadowBeg - 1;
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static const uptr kBad2Beg = kShadowEnd + 1;
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static const uptr kBad2End = kMemBeg - 1;
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static const uptr kOriginsBeg = kBad2Beg;
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static const uptr kOriginsEnd = kBad2End;
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bool InitShadow(bool prot1, bool prot2, bool map_shadow, bool init_origins) {
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if (flags()->verbosity) {
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Printf("__msan_init %p\n", &__msan_init);
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Printf("Memory : %p %p\n", kMemBeg, kMemEnd);
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Printf("Bad2 : %p %p\n", kBad2Beg, kBad2End);
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Printf("Origins : %p %p\n", kOriginsBeg, kOriginsEnd);
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Printf("Shadow : %p %p\n", kShadowBeg, kShadowEnd);
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Printf("Bad1 : %p %p\n", kBad1Beg, kBad1End);
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}
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if (prot1 && !Mprotect(kBad1Beg, kBad1End - kBad1Beg))
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return false;
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if (prot2 && !Mprotect(kBad2Beg, kBad2End - kBad2Beg))
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return false;
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if (map_shadow) {
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void *shadow = MmapFixedNoReserve(kShadowBeg, kShadowEnd - kShadowBeg);
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if (shadow != (void*)kShadowBeg) return false;
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}
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if (init_origins) {
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void *origins = MmapFixedNoReserve(kOriginsBeg, kOriginsEnd - kOriginsBeg);
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if (origins != (void*)kOriginsBeg) return false;
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}
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return true;
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}
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static void MsanTrap(int, siginfo_t *siginfo, void *context) {
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ucontext_t *ucontext = (ucontext_t*)context;
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uptr pc = ucontext->uc_mcontext.gregs[REG_RIP];
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uptr bp = ucontext->uc_mcontext.gregs[REG_RBP];
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PrintWarning(pc + 1 /*1 will be subtracted in StackTrace::Print */, bp);
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ucontext->uc_mcontext.gregs[REG_RIP] += 2;
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}
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void InstallTrapHandler() {
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struct sigaction sigact;
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internal_memset(&sigact, 0, sizeof(sigact));
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sigact.sa_sigaction = MsanTrap;
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sigact.sa_flags = SA_SIGINFO;
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CHECK_EQ(0, sigaction(SIGILL, &sigact, 0));
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}
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void MsanDie() {
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_exit(flags()->exit_code);
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}
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}
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#endif // __linux__
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