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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