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Date: Thu, 25 Nov 2021 10:52:00 -0500
From: Rich Felker <dalias@libc.org>
To: "Quesada Gonzalez, Elena" <elena.quesada_gonzalez@siemens.com>
Cc: "musl@lists.openwall.com" <musl@lists.openwall.com>
Message-ID: <20211125155200.GB7074@brightrain.aerifal.cx>
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User-Agent: Mutt/1.5.21 (2010-09-15)
Subject: Re: [musl] SIGSEV error when using REGEX with musl library

On Thu, Nov 25, 2021 at 02:53:13PM +0000, Quesada Gonzalez, Elena wrote:
> 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");
>     }
>     else
>     {
>         // get hexadecimal value
>         (void)sscanf(s.c_str(), "%X", &(m_cmdParameters.complementValue));
>     }
> 
> }
> With kind regards
> Elena Quesada Gonzalez

Do you have a complete minimal-ish test case that can be compiled and
show the same thing happening? Even just a dummy main() to call the
above the way you expect it to be called?

Rich