[libsanitizer merge from upstream r218156]

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@215527 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 27 insertions, 128 deletions

diff --git a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
index e754b26e693..36aaafdcc4b 100644
--- a/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/libsanitizer/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -15,23 +15,25 @@
 
 #include "sanitizer_common.h"
 #include "sanitizer_flags.h"
+#include "sanitizer_freebsd.h"
 #include "sanitizer_linux.h"
 #include "sanitizer_placement_new.h"
 #include "sanitizer_procmaps.h"
 #include "sanitizer_stacktrace.h"
 #include "sanitizer_atomic.h"
+#include "sanitizer_symbolizer.h"
+
+#if SANITIZER_ANDROID || SANITIZER_FREEBSD
+#include <dlfcn.h>  // for dlsym()
+#endif
 
-#include <dlfcn.h>
 #include <pthread.h>
 #include <signal.h>
 #include <sys/resource.h>
-#if SANITIZER_FREEBSD
-#define _GNU_SOURCE  // to declare _Unwind_Backtrace() from <unwind.h>
-#endif
-#include <unwind.h>
 
 #if SANITIZER_FREEBSD
 #include <pthread_np.h>
+#include <osreldate.h>
 #define pthread_getattr_np pthread_attr_get_np
 #endif
 
@@ -147,127 +149,6 @@ bool SanitizerGetThreadName(char *name, int max_len) {
 #endif
 }
 
-//------------------------- SlowUnwindStack -----------------------------------
-
-typedef struct {
-  uptr absolute_pc;
-  uptr stack_top;
-  uptr stack_size;
-} backtrace_frame_t;
-
-extern "C" {
-typedef void *(*acquire_my_map_info_list_func)();
-typedef void (*release_my_map_info_list_func)(void *map);
-typedef sptr (*unwind_backtrace_signal_arch_func)(
-    void *siginfo, void *sigcontext, void *map_info_list,
-    backtrace_frame_t *backtrace, uptr ignore_depth, uptr max_depth);
-acquire_my_map_info_list_func acquire_my_map_info_list;
-release_my_map_info_list_func release_my_map_info_list;
-unwind_backtrace_signal_arch_func unwind_backtrace_signal_arch;
-} // extern "C"
-
-#if SANITIZER_ANDROID
-void SanitizerInitializeUnwinder() {
-  void *p = dlopen("libcorkscrew.so", RTLD_LAZY);
-  if (!p) {
-    VReport(1,
-            "Failed to open libcorkscrew.so. You may see broken stack traces "
-            "in SEGV reports.");
-    return;
-  }
-  acquire_my_map_info_list =
-      (acquire_my_map_info_list_func)(uptr)dlsym(p, "acquire_my_map_info_list");
-  release_my_map_info_list =
-      (release_my_map_info_list_func)(uptr)dlsym(p, "release_my_map_info_list");
-  unwind_backtrace_signal_arch = (unwind_backtrace_signal_arch_func)(uptr)dlsym(
-      p, "unwind_backtrace_signal_arch");
-  if (!acquire_my_map_info_list || !release_my_map_info_list ||
-      !unwind_backtrace_signal_arch) {
-    VReport(1,
-            "Failed to find one of the required symbols in libcorkscrew.so. "
-            "You may see broken stack traces in SEGV reports.");
-    acquire_my_map_info_list = NULL;
-    unwind_backtrace_signal_arch = NULL;
-    release_my_map_info_list = NULL;
-  }
-}
-#endif
-
-#ifdef __arm__
-#define UNWIND_STOP _URC_END_OF_STACK
-#define UNWIND_CONTINUE _URC_NO_REASON
-#else
-#define UNWIND_STOP _URC_NORMAL_STOP
-#define UNWIND_CONTINUE _URC_NO_REASON
-#endif
-
-uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
-#ifdef __arm__
-  uptr val;
-  _Unwind_VRS_Result res = _Unwind_VRS_Get(ctx, _UVRSC_CORE,
-      15 /* r15 = PC */, _UVRSD_UINT32, &val);
-  CHECK(res == _UVRSR_OK && "_Unwind_VRS_Get failed");
-  // Clear the Thumb bit.
-  return val & ~(uptr)1;
-#else
-  return _Unwind_GetIP(ctx);
-#endif
-}
-
-struct UnwindTraceArg {
-  StackTrace *stack;
-  uptr max_depth;
-};
-
-_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
-  UnwindTraceArg *arg = (UnwindTraceArg*)param;
-  CHECK_LT(arg->stack->size, arg->max_depth);
-  uptr pc = Unwind_GetIP(ctx);
-  arg->stack->trace[arg->stack->size++] = pc;
-  if (arg->stack->size == arg->max_depth) return UNWIND_STOP;
-  return UNWIND_CONTINUE;
-}
-
-void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
-  CHECK_GE(max_depth, 2);
-  size = 0;
-  UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
-  _Unwind_Backtrace(Unwind_Trace, &arg);
-  // We need to pop a few frames so that pc is on top.
-  uptr to_pop = LocatePcInTrace(pc);
-  // trace[0] belongs to the current function so we always pop it.
-  if (to_pop == 0)
-    to_pop = 1;
-  PopStackFrames(to_pop);
-  trace[0] = pc;
-}
-
-void StackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
-                                            uptr max_depth) {
-  CHECK_GE(max_depth, 2);
-  if (!unwind_backtrace_signal_arch) {
-    SlowUnwindStack(pc, max_depth);
-    return;
-  }
-
-  void *map = acquire_my_map_info_list();
-  CHECK(map);
-  InternalScopedBuffer<backtrace_frame_t> frames(kStackTraceMax);
-  // siginfo argument appears to be unused.
-  sptr res = unwind_backtrace_signal_arch(/* siginfo */ NULL, context, map,
-                                          frames.data(),
-                                          /* ignore_depth */ 0, max_depth);
-  release_my_map_info_list(map);
-  if (res < 0) return;
-  CHECK_LE((uptr)res, kStackTraceMax);
-
-  size = 0;
-  // +2 compensate for libcorkscrew unwinder returning addresses of call
-  // instructions instead of raw return addresses.
-  for (sptr i = 0; i < res; ++i)
-    trace[size++] = frames[i].absolute_pc + 2;
-}
-
 #if !SANITIZER_FREEBSD
 static uptr g_tls_size;
 #endif
@@ -299,11 +180,11 @@ void InitTlsSize() {
 static atomic_uintptr_t kThreadDescriptorSize;
 
 uptr ThreadDescriptorSize() {
-  char buf[64];
   uptr val = atomic_load(&kThreadDescriptorSize, memory_order_relaxed);
   if (val)
     return val;
 #ifdef _CS_GNU_LIBC_VERSION
+  char buf[64];
   uptr len = confstr(_CS_GNU_LIBC_VERSION, buf, sizeof(buf));
   if (len < sizeof(buf) && internal_strncmp(buf, "glibc 2.", 8) == 0) {
     char *end;
@@ -468,6 +349,10 @@ uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
 #else  // SANITIZER_ANDROID
 # if !SANITIZER_FREEBSD
 typedef ElfW(Phdr) Elf_Phdr;
+# elif SANITIZER_WORDSIZE == 32 && __FreeBSD_version <= 902001  // v9.2
+#  define Elf_Phdr XElf32_Phdr
+#  define dl_phdr_info xdl_phdr_info
+#  define dl_iterate_phdr(c, b) xdl_iterate_phdr((c), (b))
 # endif
 
 struct DlIteratePhdrData {
@@ -504,7 +389,8 @@ static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
     if (phdr->p_type == PT_LOAD) {
       uptr cur_beg = info->dlpi_addr + phdr->p_vaddr;
       uptr cur_end = cur_beg + phdr->p_memsz;
-      cur_module->addAddressRange(cur_beg, cur_end);
+      bool executable = phdr->p_flags & PF_X;
+      cur_module->addAddressRange(cur_beg, cur_end, executable);
     }
   }
   return 0;
@@ -527,6 +413,19 @@ void SetIndirectCallWrapper(uptr wrapper) {
   indirect_call_wrapper = wrapper;
 }
 
+void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
+  // Some kinds of sandboxes may forbid filesystem access, so we won't be able
+  // to read the file mappings from /proc/self/maps. Luckily, neither the
+  // process will be able to load additional libraries, so it's fine to use the
+  // cached mappings.
+  MemoryMappingLayout::CacheMemoryMappings();
+  // Same for /proc/self/exe in the symbolizer.
+#if !SANITIZER_GO
+  Symbolizer::GetOrInit()->PrepareForSandboxing();
+  CovPrepareForSandboxing(args);
+#endif
+}
+
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX