[LLVMbugs] [Bug 19890] New: llvm-readobj crashes when parsing ARM EHABI unwind opcodes

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19890

            Bug ID: 19890
           Summary: llvm-readobj crashes when parsing ARM EHABI unwind
                    opcodes
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: jonathan at codesourcery.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12577
  --> http://llvm.org/bugs/attachment.cgi?id=12577&action=edit
offending file

[14:14:22] ✘ jroelofs at Escher test$
/Users/jroelofs/workdir/llvm/build/Debug+Asserts/bin/llvm-readobj -unwind
catch_in_noexcept.cpp.out

File: catch_in_noexcept.cpp.out
Format: ELF32-arm
Arch: arm
AddressSize: 32bit
LoadName: 
UnwindInformation {
  UnwindIndexTable {
    SectionIndex: 3
    SectionName: .ARM.exidx
    SectionOffset: 0x65DAC
    Entries [
      Entry {
        FunctionAddress: 0x248
        FunctionName: _Z2f1v
        Model: CantUnwind
      }
      Entry {
        FunctionAddress: 0x2D8
        Model: Compact (Inline)
        PersonalityIndex: 0
        Opcodes [
          0x9B      ; vsp = r11
          0x84 0x80 ; pop {fp, lr}
        ]
      }
      Entry {
        FunctionAddress: 0x8F4
0  llvm-readobj             0x0000000104618f7e
llvm::sys::PrintStackTrace(__sFILE*) + 46
1  llvm-readobj             0x000000010461928b
PrintStackTraceSignalHandler(void*) + 27
2  llvm-readobj             0x000000010461961c SignalHandler(int) + 412
3  libsystem_platform.dylib 0x00007fff9637d5aa _sigtramp + 26
4  libsystem_platform.dylib 000000000000000000 _sigtramp + 1774725744
5  llvm-readobj             0x00000001043f6a35
llvm::support::detail::packed_endian_specific_integral<unsigned int,
(llvm::support::endianness)1, 2ul>::operator unsigned int() const + 21
6  llvm-readobj             0x000000010440113f
llvm::object::ELFFile<llvm::object::ELFType<(llvm::support::endianness)1, 2ul,
false>
>::getSectionName(llvm::object::Elf_Shdr_Impl<llvm::object::ELFType<(llvm::support::endianness)1,
2ul, false> > const*) const + 47
7  llvm-readobj             0x00000001044016ab
llvm::ARM::EHABI::PrinterContext<llvm::object::ELFType<(llvm::support::endianness)1,
2ul, false> >::PrintIndexTable(unsigned int,
llvm::object::Elf_Shdr_Impl<llvm::object::ELFType<(llvm::support::endianness)1,
2ul, false> > const*) const + 1243
8  llvm-readobj             0x00000001044010ad
llvm::ARM::EHABI::PrinterContext<llvm::object::ELFType<(llvm::support::endianness)1,
2ul, false> >::PrintUnwindInformation() const + 605
9  llvm-readobj             0x00000001043e49bf (anonymous
namespace)::ELFDumper<llvm::object::ELFType<(llvm::support::endianness)1, 2ul,
false> >::printUnwindInfo() + 95
10 llvm-readobj             0x000000010440fcbe
dumpObject(llvm::object::ObjectFile const*) + 1454
11 llvm-readobj             0x000000010440f0a9 dumpInput(llvm::StringRef) + 857
12 llvm-readobj             0x000000010440ece1 main + 1521
13 libdyld.dylib            0x00007fff8eb055fd start + 1
14 libdyld.dylib            0x0000000000000003 start + 1901046279
Stack dump:
0.    Program arguments:
/Users/jroelofs/workdir/llvm/build/Debug+Asserts/bin/llvm-readobj -unwind
catch_in_noexcept.cpp.out 
Segmentation fault: 11

[14:16:44] ✘ jroelofs at Escher test$ cat catch_in_noexcept.cpp
//===----------------------
catch_in_noexcept.cpp--------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include <exception>
#include <stdlib.h>
#include <assert.h>

struct A {};

void f1() noexcept
{
    try {
        A a;
        throw a;
        assert(false);
    } catch (...) {
        assert(true);
        return;
    }
    assert(false);
}

int main()
{
    f1();
}

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