1 files changed, 187 insertions, 0 deletions
diff --git a/libasan/sanitizer_common/sanitizer_posix.cc b/libasan/sanitizer_common/sanitizer_posix.cc
new file mode 100644
index 00000000000..8f71cfc049d
--- /dev/null
+++ b/libasan/sanitizer_common/sanitizer_posix.cc
@@ -0,0 +1,187 @@
+//===-- sanitizer_posix.cc ------------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries and implements POSIX-specific functions from
+// sanitizer_libc.h.
+//===----------------------------------------------------------------------===//
+#if defined(__linux__) || defined(__APPLE__)
+
+#include "sanitizer_common.h"
+#include "sanitizer_libc.h"
+#include "sanitizer_procmaps.h"
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace __sanitizer {
+
+// ------------- sanitizer_common.h
+
+int GetPid() {
+  return getpid();
+}
+
+uptr GetThreadSelf() {
+  return (uptr)pthread_self();
+}
+
+void *MmapOrDie(uptr size, const char *mem_type) {
+  size = RoundUpTo(size, kPageSize);
+  void *res = internal_mmap(0, size,
+                            PROT_READ | PROT_WRITE,
+                            MAP_PRIVATE | MAP_ANON, -1, 0);
+  if (res == (void*)-1) {
+    static int recursion_count;
+    if (recursion_count) {
+      // The Report() and CHECK calls below may call mmap recursively and fail.
+      // If we went into recursion, just die.
+      RawWrite("AddressSanitizer is unable to mmap\n");
+      Die();
+    }
+    recursion_count++;
+    Report("ERROR: Failed to allocate 0x%zx (%zd) bytes of %s: %s\n",
+           size, size, mem_type, strerror(errno));
+    DumpProcessMap();
+    CHECK("unable to mmap" && 0);
+  }
+  return res;
+}
+
+void UnmapOrDie(void *addr, uptr size) {
+  if (!addr || !size) return;
+  int res = internal_munmap(addr, size);
+  if (res != 0) {
+    Report("ERROR: Failed to deallocate 0x%zx (%zd) bytes at address %p\n",
+           size, size, addr);
+    CHECK("unable to unmap" && 0);
+  }
+}
+
+void *MmapFixedNoReserve(uptr fixed_addr, uptr size) {
+  return internal_mmap((void*)fixed_addr, size,
+                      PROT_READ | PROT_WRITE,
+                      MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
+                      -1, 0);
+}
+
+void *Mprotect(uptr fixed_addr, uptr size) {
+  return internal_mmap((void*)fixed_addr, size,
+                       PROT_NONE,
+                       MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE,
+                       -1, 0);
+}
+
+void *MapFileToMemory(const char *file_name, uptr *buff_size) {
+  fd_t fd = internal_open(file_name, false);
+  CHECK_NE(fd, kInvalidFd);
+  uptr fsize = internal_filesize(fd);
+  CHECK_NE(fsize, (uptr)-1);
+  CHECK_GT(fsize, 0);
+  *buff_size = RoundUpTo(fsize, kPageSize);
+  void *map = internal_mmap(0, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
+  return (map == MAP_FAILED) ? 0 : map;
+}
+
+
+static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
+                                        uptr start2, uptr end2) {
+  CHECK(start1 <= end1);
+  CHECK(start2 <= end2);
+  return (end1 < start2) || (end2 < start1);
+}
+
+// FIXME: this is thread-unsafe, but should not cause problems most of the time.
+// When the shadow is mapped only a single thread usually exists (plus maybe
+// several worker threads on Mac, which aren't expected to map big chunks of
+// memory).
+bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
+  MemoryMappingLayout procmaps;
+  uptr start, end;
+  while (procmaps.Next(&start, &end,
+                       /*offset*/0, /*filename*/0, /*filename_size*/0)) {
+    if (!IntervalsAreSeparate(start, end, range_start, range_end))
+      return false;
+  }
+  return true;
+}
+
+void DumpProcessMap() {
+  MemoryMappingLayout proc_maps;
+  uptr start, end;
+  const sptr kBufSize = 4095;
+  char *filename = (char*)MmapOrDie(kBufSize, __FUNCTION__);
+  Report("Process memory map follows:\n");
+  while (proc_maps.Next(&start, &end, /* file_offset */0,
+                        filename, kBufSize)) {
+    Printf("\t%p-%p\t%s\n", (void*)start, (void*)end, filename);
+  }
+  Report("End of process memory map.\n");
+  UnmapOrDie(filename, kBufSize);
+}
+
+const char *GetPwd() {
+  return GetEnv("PWD");
+}
+
+void DisableCoreDumper() {
+  struct rlimit nocore;
+  nocore.rlim_cur = 0;
+  nocore.rlim_max = 0;
+  setrlimit(RLIMIT_CORE, &nocore);
+}
+
+bool StackSizeIsUnlimited() {
+  struct rlimit rlim;
+  CHECK_EQ(0, getrlimit(RLIMIT_STACK, &rlim));
+  return (rlim.rlim_cur == (uptr)-1);
+}
+
+void SetStackSizeLimitInBytes(uptr limit) {
+  struct rlimit rlim;
+  rlim.rlim_cur = limit;
+  rlim.rlim_max = limit;
+  CHECK_EQ(0, setrlimit(RLIMIT_STACK, &rlim));
+  CHECK(!StackSizeIsUnlimited());
+}
+
+void SleepForSeconds(int seconds) {
+  sleep(seconds);
+}
+
+void SleepForMillis(int millis) {
+  usleep(millis * 1000);
+}
+
+void Exit(int exitcode) {
+  _exit(exitcode);
+}
+
+void Abort() {
+  abort();
+}
+
+int Atexit(void (*function)(void)) {
+#ifndef SANITIZER_GO
+  return atexit(function);
+#else
+  return 0;
+#endif
+}
+
+}  // namespace __sanitizer
+
+#endif  // __linux__ || __APPLE_