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Commit cc99ba7f authored by Christopher Ferris's avatar Christopher Ferris Committed by android-build-merger
Browse files

Merge "Do not access device maps." 

am: a06e1c9e

Change-Id: Id30b71a301953d8450bd66552a020437c5e91b94
parents c0405200 a06e1c9e

debuggerd/libdebuggerd/tombstone.cpp

+1 −1
Original line number Diff line number Diff line
@@ -283,7 +283,7 @@ static void dump_stack_segment( 
    if (BacktraceMap::IsValid(map) && !map.name.empty()) {

      line += "  " + map.name;

      uintptr_t offset = 0;

      std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset));

      std::string func_name(backtrace->GetFunctionName(stack_data[i], &offset, &map));

      if (!func_name.empty()) {

        line += " (" + func_name;

        if (offset) {

include/backtrace/Backtrace.h

+4 −2
Original line number Diff line number Diff line
@@ -104,8 +104,10 @@ public: 
  virtual bool Unwind(size_t num_ignore_frames, ucontext_t* context = NULL) = 0;



  // Get the function name and offset into the function given the pc.

  // If the string is empty, then no valid function name was found.

  virtual std::string GetFunctionName(uintptr_t pc, uintptr_t* offset);

  // If the string is empty, then no valid function name was found,

  // or the pc is not in any valid map.

  virtual std::string GetFunctionName(uintptr_t pc, uintptr_t* offset,

                                      const backtrace_map_t* map = NULL);



  // Fill in the map data associated with the given pc.

  virtual void FillInMap(uintptr_t pc, backtrace_map_t* map);

include/backtrace/BacktraceMap.h

+4 −0
Original line number Diff line number Diff line
@@ -33,6 +33,10 @@ 
#include <string>

#include <vector>



// Special flag to indicate a map is in /dev/. However, a map in

// /dev/ashmem/... does not set this flag.

static constexpr int PROT_DEVICE_MAP = 0x8000;



struct backtrace_map_t {

  uintptr_t start = 0;

  uintptr_t end = 0;

libbacktrace/Backtrace.cpp

+10 −1
Original line number Diff line number Diff line
@@ -52,7 +52,16 @@ Backtrace::~Backtrace() { 
  }

}



std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset) {

std::string Backtrace::GetFunctionName(uintptr_t pc, uintptr_t* offset, const backtrace_map_t* map) {

  backtrace_map_t map_value;

  if (map == nullptr) {

    FillInMap(pc, &map_value);

    map = &map_value;

  }

  // If no map is found, or this map is backed by a device, then return nothing.

  if (map->start == 0 || (map->flags & PROT_DEVICE_MAP)) {

    return "";

  }

  std::string func_name = GetFunctionNameRaw(pc, offset);

  return func_name;

}

libbacktrace/UnwindCurrent.cpp

+11 −1
Original line number Diff line number Diff line
@@ -127,7 +127,7 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucon 
      if (num_ignore_frames == 0) {

        // GetFunctionName is an expensive call, only do it if we are

        // keeping the frame.

        frame->func_name = GetFunctionName(frame->pc, &frame->func_offset);

        frame->func_name = GetFunctionName(frame->pc, &frame->func_offset, &frame->map);

        if (num_frames > 0) {

          // Set the stack size for the previous frame.

          backtrace_frame_data_t* prev = &frames_.at(num_frames-1);
@@ -143,6 +143,16 @@ bool UnwindCurrent::UnwindFromContext(size_t num_ignore_frames, ucontext_t* ucon 
        frames_.resize(0);

      }

    }

    // If the pc is in a device map, then don't try to step.

    if (frame->map.flags & PROT_DEVICE_MAP) {

      break;

    }

    // Verify the sp is not in a device map too.

    backtrace_map_t map;

    FillInMap(frame->sp, &map);

    if (map.flags & PROT_DEVICE_MAP) {

      break;

    }

    ret = unw_step (cursor.get());

  } while (ret > 0 && num_frames < MAX_BACKTRACE_FRAMES);