149 lines
4.1 KiB
C++
149 lines
4.1 KiB
C++
//===-- sanitizer_posix_libcdep.cc ----------------------------------------===//
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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 shared between AddressSanitizer and ThreadSanitizer
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// run-time libraries and implements libc-dependent POSIX-specific functions
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// from sanitizer_libc.h.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_platform.h"
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#if SANITIZER_POSIX
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#include "sanitizer_common.h"
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#include "sanitizer_flags.h"
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#include "sanitizer_platform_limits_posix.h"
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#include "sanitizer_stacktrace.h"
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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namespace __sanitizer {
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u32 GetUid() {
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return getuid();
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}
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uptr GetThreadSelf() {
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return (uptr)pthread_self();
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}
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void FlushUnneededShadowMemory(uptr addr, uptr size) {
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madvise((void*)addr, size, MADV_DONTNEED);
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}
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void DisableCoreDumper() {
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struct rlimit nocore;
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nocore.rlim_cur = 0;
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nocore.rlim_max = 0;
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setrlimit(RLIMIT_CORE, &nocore);
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}
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bool StackSizeIsUnlimited() {
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struct rlimit rlim;
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CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
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return ((uptr)rlim.rlim_cur == (uptr)-1);
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}
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void SetStackSizeLimitInBytes(uptr limit) {
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struct rlimit rlim;
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rlim.rlim_cur = limit;
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rlim.rlim_max = limit;
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if (setrlimit(RLIMIT_STACK, &rlim)) {
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Report("ERROR: %s setrlimit() failed %d\n", SanitizerToolName, errno);
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Die();
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}
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CHECK(!StackSizeIsUnlimited());
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}
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void SleepForSeconds(int seconds) {
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sleep(seconds);
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}
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void SleepForMillis(int millis) {
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usleep(millis * 1000);
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}
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void Abort() {
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abort();
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}
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int Atexit(void (*function)(void)) {
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#ifndef SANITIZER_GO
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return atexit(function);
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#else
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return 0;
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#endif
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}
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int internal_isatty(fd_t fd) {
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return isatty(fd);
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}
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#ifndef SANITIZER_GO
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// TODO(glider): different tools may require different altstack size.
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static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
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void SetAlternateSignalStack() {
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stack_t altstack, oldstack;
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CHECK_EQ(0, sigaltstack(0, &oldstack));
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// If the alternate stack is already in place, do nothing.
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// Android always sets an alternate stack, but it's too small for us.
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if (!SANITIZER_ANDROID && !(oldstack.ss_flags & SS_DISABLE)) return;
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// TODO(glider): the mapped stack should have the MAP_STACK flag in the
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// future. It is not required by man 2 sigaltstack now (they're using
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// malloc()).
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void* base = MmapOrDie(kAltStackSize, __func__);
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altstack.ss_sp = (char*) base;
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altstack.ss_flags = 0;
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altstack.ss_size = kAltStackSize;
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CHECK_EQ(0, sigaltstack(&altstack, 0));
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}
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void UnsetAlternateSignalStack() {
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stack_t altstack, oldstack;
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altstack.ss_sp = 0;
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altstack.ss_flags = SS_DISABLE;
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altstack.ss_size = kAltStackSize; // Some sane value required on Darwin.
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CHECK_EQ(0, sigaltstack(&altstack, &oldstack));
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UnmapOrDie(oldstack.ss_sp, oldstack.ss_size);
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}
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typedef void (*sa_sigaction_t)(int, siginfo_t *, void *);
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static void MaybeInstallSigaction(int signum,
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SignalHandlerType handler) {
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if (!IsDeadlySignal(signum))
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return;
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struct sigaction sigact;
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internal_memset(&sigact, 0, sizeof(sigact));
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sigact.sa_sigaction = (sa_sigaction_t)handler;
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sigact.sa_flags = SA_SIGINFO;
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if (common_flags()->use_sigaltstack) sigact.sa_flags |= SA_ONSTACK;
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CHECK_EQ(0, internal_sigaction(signum, &sigact, 0));
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VReport(1, "Installed the sigaction for signal %d\n", signum);
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}
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void InstallDeadlySignalHandlers(SignalHandlerType handler) {
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// Set the alternate signal stack for the main thread.
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// This will cause SetAlternateSignalStack to be called twice, but the stack
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// will be actually set only once.
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if (common_flags()->use_sigaltstack) SetAlternateSignalStack();
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MaybeInstallSigaction(SIGSEGV, handler);
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MaybeInstallSigaction(SIGBUS, handler);
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}
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#endif // SANITIZER_GO
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} // namespace __sanitizer
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#endif // SANITIZER_POSIX
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