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Commit 4a648392 authored by Christopher Ferris's avatar Christopher Ferris Committed by Android (Google) Code Review
Browse files

Merge "Fix off by one reading build id." into qt-dev

parents d5887289 a46de760

libunwindstack/ElfInterface.cpp

+1 −1
Original line number Diff line number Diff line
@@ -285,7 +285,7 @@ std::string ElfInterface::ReadBuildID() { 
        if (gnu_build_id_size_ - offset < hdr.n_descsz || hdr.n_descsz == 0) {

          return "";

        }

        std::string build_id(hdr.n_descsz - 1, '\0');

        std::string build_id(hdr.n_descsz, '\0');

        if (memory_->ReadFully(gnu_build_id_offset_ + offset, &build_id[0], hdr.n_descsz)) {

          return build_id;

        }

libunwindstack/tests/ElfInterfaceTest.cpp

+29 −18
Original line number Diff line number Diff line
@@ -1192,14 +1192,16 @@ void ElfInterfaceTest::BuildID() { 
  char note_section[128];

  Nhdr note_header = {};

  note_header.n_namesz = 4;  // "GNU"

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section, &note_header, sizeof(note_header));

  size_t note_offset = sizeof(note_header);

  // The note information contains the GNU and trailing '\0'.

  memcpy(&note_section[note_offset], "GNU", sizeof("GNU"));

  note_offset += sizeof("GNU");

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  Shdr shdr = {};

  shdr.sh_type = SHT_NOTE;
@@ -1244,24 +1246,27 @@ void ElfInterfaceTest::BuildIDTwoNotes() { 
  char note_section[128];

  Nhdr note_header = {};

  note_header.n_namesz = 8;  // "WRONG" aligned to 4

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section, &note_header, sizeof(note_header));

  size_t note_offset = sizeof(note_header);

  memcpy(&note_section[note_offset], "WRONG", sizeof("WRONG"));

  note_offset += 8;

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  note_header.n_namesz = 4;  // "GNU"

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section[note_offset], &note_header, sizeof(note_header));

  note_offset += sizeof(note_header);

  // The note information contains the GNU and trailing '\0'.

  memcpy(&note_section[note_offset], "GNU", sizeof("GNU"));

  note_offset += sizeof("GNU");

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  Shdr shdr = {};

  shdr.sh_type = SHT_NOTE;
@@ -1306,14 +1311,16 @@ void ElfInterfaceTest::BuildIDSectionTooSmallForName () { 
  char note_section[128];

  Nhdr note_header = {};

  note_header.n_namesz = 4;  // "GNU"

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section, &note_header, sizeof(note_header));

  size_t note_offset = sizeof(note_header);

  // The note information contains the GNU and trailing '\0'.

  memcpy(&note_section[note_offset], "GNU", sizeof("GNU"));

  note_offset += sizeof("GNU");

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  Shdr shdr = {};

  shdr.sh_type = SHT_NOTE;
@@ -1358,14 +1365,16 @@ void ElfInterfaceTest::BuildIDSectionTooSmallForDesc () { 
  char note_section[128];

  Nhdr note_header = {};

  note_header.n_namesz = 4;  // "GNU"

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section, &note_header, sizeof(note_header));

  size_t note_offset = sizeof(note_header);

  // The note information contains the GNU and trailing '\0'.

  memcpy(&note_section[note_offset], "GNU", sizeof("GNU"));

  note_offset += sizeof("GNU");

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  Shdr shdr = {};

  shdr.sh_type = SHT_NOTE;
@@ -1410,14 +1419,16 @@ void ElfInterfaceTest::BuildIDSectionTooSmallForHeader () { 
  char note_section[128];

  Nhdr note_header = {};

  note_header.n_namesz = 4;  // "GNU"

  note_header.n_descsz = 8; // "BUILDID"

  note_header.n_descsz = 7;  // "BUILDID"

  note_header.n_type = NT_GNU_BUILD_ID;

  memcpy(&note_section, &note_header, sizeof(note_header));

  size_t note_offset = sizeof(note_header);

  // The note information contains the GNU and trailing '\0'.

  memcpy(&note_section[note_offset], "GNU", sizeof("GNU"));

  note_offset += sizeof("GNU");

  memcpy(&note_section[note_offset], "BUILDID", sizeof("BUILDID"));

  note_offset += sizeof("BUILDID");

  // This part of the note does not contain any trailing '\0'.

  memcpy(&note_section[note_offset], "BUILDID", 7);

  note_offset += 8;



  Shdr shdr = {};

  shdr.sh_type = SHT_NOTE;

libunwindstack/tests/UnwindOfflineTest.cpp

+17 −0
Original line number Diff line number Diff line
@@ -204,6 +204,7 @@ static std::string DumpFrames(Unwinder& unwinder) { 
TEST_F(UnwindOfflineTest, pc_straddle_arm) {

  ASSERT_NO_FATAL_FAILURE(Init("straddle_arm/", ARCH_ARM));



  std::unique_ptr<Regs> regs_copy(regs_->Clone());

  Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);

  unwinder.Unwind();
@@ -223,6 +224,22 @@ TEST_F(UnwindOfflineTest, pc_straddle_arm) { 
  EXPECT_EQ(0xe9c86730U, unwinder.frames()[2].sp);

  EXPECT_EQ(0xf3367147U, unwinder.frames()[3].pc);

  EXPECT_EQ(0xe9c86778U, unwinder.frames()[3].sp);



  // Display build ids now.

  unwinder.SetRegs(regs_copy.get());

  unwinder.SetDisplayBuildID(true);

  unwinder.Unwind();



  frame_info = DumpFrames(unwinder);

  ASSERT_EQ(4U, unwinder.NumFrames()) << "Unwind:\n" << frame_info;

  EXPECT_EQ(

      "  #00 pc 0001a9f8  libc.so (abort+64) (BuildId: 2dd0d4ba881322a0edabeed94808048c)\n"

      "  #01 pc 00006a1b  libbase.so (android::base::DefaultAborter(char const*)+6) (BuildId: "

      "ed43842c239cac1a618e600ea91c4cbd)\n"

      "  #02 pc 00007441  libbase.so (android::base::LogMessage::~LogMessage()+748) (BuildId: "

      "ed43842c239cac1a618e600ea91c4cbd)\n"

      "  #03 pc 00015147  /does/not/exist/libhidlbase.so\n",

      frame_info);

}



TEST_F(UnwindOfflineTest, pc_in_gnu_debugdata_arm) {