C++ Std::Condition_Variable Null Pointer Derreference

This story is about a bug generated by g++ and clang compilers (at least)
The condition_variables is a feature on the standard library of c++ (libstdc++), when its compiled statically a weird asm code is generated.


Any example on the link below will crash if its compiled statically:
 https://en.cppreference.com/w/cpp/thread/condition_variable

In this case the condition_variable.wait() crashed, but this happens with other methods, a simple way to trigger it:

If this program is compiled dynamically the crash doesn't occur:

Looking the dissasembly there is a surprise created by the compiler:

Compilers:
    g++  9.2.1+20200130-2
    clang++ v9

Both compilers are generating the "call 0x00"

If we check this call in a dynamic compiled:

The implementation of condition_variable in github:
https://github.com/gcc-mirror/gcc/blob/b7c9bd36eaacac42631b882dc67a6f0db94de21c/libstdc%2B%2B-v3/include/std/condition_variable

The compilers can't copile well this code in static,  and same happens on  other condition_variable methods.
I would say the _lock is being assembled improperly in static, is not exacly a null pointer derreference but the effects are the same, executing code at address 0x00 which on linux is a crash on most of cases.

More articles

1. Hacking Tools Online
2. Hacking Tools For Games
3. Hack Tools
4. Hack Tools Download
5. Hacking Tools Hardware
6. Hacking Tools For Beginners
7. Hack Tools Online
8. Hacker Techniques Tools And Incident Handling
9. Hacking Tools For Windows
10. Hacking Tools
11. Pentest Tools Apk
12. Pentest Tools Linux
13. Hacking Tools Online
14. Black Hat Hacker Tools
15. Hacker Tools For Mac
16. Pentest Tools Windows
17. Pentest Tools Android
18. Hacker Tools Github
19. Tools For Hacker
20. New Hack Tools
21. Game Hacking
22. Hacking App
23. Pentest Tools For Mac
24. Hack Tools Github
25. Pentest Reporting Tools
26. Easy Hack Tools
27. Install Pentest Tools Ubuntu
28. Hack Tools Github
29. Hacking Tools Free Download