null handle returned for libSDL3.so.0

[Trololp]

System: linux, Ubuntu 22.04
cs2: launched with -insecure
I build libOsiris, then injected library
with ptrace and dlmopen(LM_ID_NEWLM, lib_path, RTLD_NOW);
, and nothing happen.
I wrote just simple library to test that getModuleHandle not working with cs2 libraries
I tried libSDL3.so.0 (with full path, just name of library not work for me idk why)
to get handle in my dynamic library using dlopen(libraryName, RTLD_NOLOAD | RTLD_LAZY);
it return 0, and dlerror not say anything(returns nullptr).
Then I tried libm.so.6 and everything just works fine.

Seems like VAC protection? Ways to bypass?

[danielkrupinski]

Please show the output of cat /proc/$(pidof cs2)/maps | grep SDL
The problem might be with LM_ID_NEWLM parameter, try to use LM_ID_BASE instead. Also why do you use dlmopen() instead of dlopen()?

[Trololp]

7f048d915000-7f048d946000 r--p 00000000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0
7f048d946000-7f048dae7000 r-xp 00031000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0
7f048dae7000-7f048db80000 r--p 001d2000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0
7f048db80000-7f048db81000 ---p 0026b000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0
7f048db81000-7f048db8b000 r--p 0026b000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0
7f048db8b000-7f048db96000 rw-p 00275000 08:01 16796237                   /media/trololp/data/SteamLibrary/steamapps/common/Counter-Strike Global Offensive/game/bin/linuxsteamrt64/libSDL3.so.0