Considering that the current stable version of Clang is 11, would or not make sense to upgrade your compiler?
Not to mention that your OS probably does not get any security patches now -
so, perhaps, moving from 18.04LTS to 20.04 LTS would be a good idea?
I regularly build with Clang and GCC, no crashes.
> On Apr 18, 2021, at 08:02, Sunandan Nandi <sunandan.na...@gmail.com> wrote:
>
> Hi,
>
> I am experiencing Segfault inside CryptoPP::StreamTransformationFilter.
>
> Overview:
> I have downloaded and built CryptoPP as an external CMake module.
> Problem:
> This segfault is happening only in Linux(Ubuntu 18.04.05LTS) Release build.
> 64-bit,compiler clang 6.0
>
> GDB BT
> Thread 9 "***" received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0x7fffdb7fe700 (LWP 5835)]
> 0x0000000000000000 in ?? ()
> (gdb) bt
> #0 0x0000000000000000 in ?? ()
> #1 0x0000000000b7559d in
> CryptoPP::StreamTransformationFilter::StreamTransformationFilter
> (this=0x7fffdb7fd1c0, c=..., attachment=<optimized out>,
> padding=<optimized out>) at filters.cpp:593
> #2 0x00000000004ff4fd in
> ***::AESEncryptDecryptUtility::decrypt(std::__cxx11::basic_string<char,
> std::char_traits<char>, std::allocator<char> > const&) ()
>
> Trials to resolve this issue:
> If I build my target where I am using CryptoPP( static lib) with optimization
> level O1 or less, then no segfault observed. But this issue is with
> optimization level O2 or more.
>
> Code snippet:
> std::string AESEncryptDecryptUtility::decrypt(const std::string&
> encrypted_text) { std::string decrypted_text; CryptoPP::AES::Decryption
> aesDecryption(key_.data(), KEY_LENGTH);
> CryptoPP::CBC_Mode_ExternalCipher::Decryption cbcDecryption(aesDecryption,
> iv_.data()); CryptoPP::StreamTransformationFilter stfDecryptor(cbcDecryption,
> new CryptoPP::StringSink(decrypted_text));
> stfDecryptor.Put(reinterpret_cast<const unsigned
> char*>(encrypted_text.c_str()), encrypted_text.size());
> stfDecryptor.MessageEnd(); return decrypted_text;
>
> Inside StreamTransformationFilter() where it's crashing, the line highlighted
> in Red is pointing in GDB as the last point before the crash(segfault)
>
> StreamTransformationFilter::StreamTransformationFilter(StreamTransformation
> &c, BufferedTransformation *attachment, BlockPaddingScheme padding)
> : FilterWithBufferedInput(attachment), m_cipher(c),
> m_padding(DEFAULT_PADDING)
> {
> CRYPTOPP_ASSERT(c.MinLastBlockSize() == 0 || c.MinLastBlockSize() >
> c.MandatoryBlockSize());
>
> const bool authenticatedFilter =
> dynamic_cast<AuthenticatedSymmetricCipher *>(&c) != NULLPTR;
> if (authenticatedFilter)
> throw InvalidArgument("StreamTransformationFilter: please use
> AuthenticatedEncryptionFilter and AuthenticatedDecryptionFilter for
> AuthenticatedSymmetricCipher");
>
> // InitializeDerivedAndReturnNewSizes may override some of these
> m_mandatoryBlockSize = m_cipher.MandatoryBlockSize();
>
> Please let me know if any other information needed.
>
> Regards,
> Sunandan
>
>
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