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Date: Thu, 25 Nov 2021 14:53:13 +0000
From: "Quesada Gonzalez, Elena" <>
To: "" <>
Subject: SIGSEV error when using REGEX with musl library

I have the following function that works fine if the regular expression is correct, but get a SIGSEGV when calling  regex_search  compiling with clang-9 and using musl 1.2.
However, it works fine with glibc,

Could be a bug in musl library?

Find code below

void CRuntimeCommandLine::LoadComplement(const multimap<std::string, std::string>& mapArguments)
    // Find parameter
    multimap<string, string>::const_iterator iter;
    iter = mapArguments.find("Complement");
    if(iter == mapArguments.end())
        // Only fatal. Statement is not initialized yet.
        Logger::fatal(Errors::RCMD_F005_MISSING_MANDATORY_PARAM, "Missing mandatory parameter --Complement");
    // regex expression for system_secret to be checked (Max 4Bytes, hexadecimal number in lowe case letters and no 0x format)
    regex regexp("^[0-9a-f]{1,8}$");

    // regex_search that searches pattern regexp in the string mystr
    std::string s = iter->second.c_str();
    if (false == std::regex_search(s, regexp))
        // Only fatal. Statement is not initialized yet.
        Logger::fatal(Errors::RCMD_F006_INVALID_VALUE, "Invalid --Complement=hexvalue value");
        // get hexadecimal value
        (void)sscanf(s.c_str(), "%X", &(m_cmdParameters.complementValue));

With kind regards
Elena Quesada Gonzalez

Siemens Rail Automation S.A.U.
Rail Infrastructure
Ronda de Europa, 5
28760 Tres Cantos, Spain
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