Description of problem: Create a private key with out CKA_ID explicitly set to zero-length byte string in the template. Trying to retrieve the attribute results in the assertion /usr/include/c++/8/bits/stl_vector.h:950: std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = unsigned char; _Alloc = SecureAllocator<unsigned char>; std::vector<_Tp, _Alloc>::const_reference = const unsigned char&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed. Version-Release number of selected component (if applicable): How reproducible: softhsm-2.5.0-2.fc29.x86_64 Steps to Reproduce: 1. Create private key and explicitly set CKA_ID to zero-length byte string 2. Reproducers in the external ticket 3. C_GetAttributeValue on CKA_ID Actual results: /usr/include/c++/8/bits/stl_vector.h:950: std::vector<_Tp, _Alloc>::const_reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) const [with _Tp = unsigned char; _Alloc = SecureAllocator<unsigned char>; std::vector<_Tp, _Alloc>::const_reference = const unsigned char&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed. Aborted (core dumped) Expected results: Able to retrieve the zero-length CKA_ID Additional info: 1. For public key and certs, there is no issue in retrieving CKA_ID even if explicitly created as zero-length byte string 2. For new private keys without explicit CKA_ID in the template; there is an implicit zero-length CKA_ID and this can be retrieved. But once the CKA_ID is explicitly set, then the error occurs
Problem does not happen on CentOS 7/RHEL 7 with softhsm-2.1.0-2.el7.x86_64
Build from upstream Github develop/2.5.0 with no Fedora localisations sh autogen.sh ./configure --disable-strict make The resulting artifacts works without assertion
TL;DR - taking a reference of the "first" element of a zero-length unsigned char array Root cause: when retrieving attributes from sensitive objects(e.g. private keys), the serialized attribute value is first decrypted, but P11Attributes.cpp:343 does not check the return value has size != 0. It takes a reference, &byteString[0], on a zero-length array. When the library is built with -Wp,-D_GLIBCXX_ASSERTIONS the assertion is triggered.
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Fedora 29 changed to end-of-life (EOL) status on 2019-11-26. Fedora 29 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.