Linker can't find C library, ignores .rpath? #489
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ekilmer
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May 4, 2022
## newstat - Currently `sys_newstat`'s implementation is based on `sys_stat64` - This is inaccurate because `sys_stat64` is expected to return a `struct stat64` back to userland [ref1](https://elixir.bootlin.com/linux/v5.17.5/source/fs/stat.c#L521) [ref2](https://elixir.bootlin.com/linux/v5.17.5/source/arch/x86/include/uapi/asm/stat.h#L42) - Instead, `sys_newstat` is supposed to return a `struct stat` [ref1](https://elixir.bootlin.com/linux/v5.17.5/source/fs/stat.c#L380) [ref2](https://elixir.bootlin.com/linux/v5.17.5/source/arch/x86/include/uapi/asm/stat.h#L83) - This causes issues because the two structs have different definitions, and in practice causes errors in the loader. For example "LD_LIBRARY_PATH" environment variable does not work. I suspect #489 might be related as well but I have yet to test. - To fix this we can reuse the `sys_newfstat` implementation, which returns the correct `struct stat` structure to userland ## newfstat - Currently `sys_newfstat` returns a structure based on the x86_64 version of `struct stat` [ref1](https://elixir.bootlin.com/linux/v5.17.5/source/arch/x86/include/uapi/asm/stat.h#L83) - This does not account for the different `struct stat` definition on 32-bit x86 [ref1](https://elixir.bootlin.com/linux/v5.17.5/source/arch/x86/include/uapi/asm/stat.h#L10) (Notice the `#ifdef`)
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OS / Environment
Docker: Ubuntu 16.04
Installed C libraries:
Manticore version
Version: 0.1.4
Python version
Python 2.7.12
Dependencies
capstone==3.0.5rc2
manticore==0.1.4
ply==3.10
pyelftools==0.24
unicorn==1.0.1
Summary of the problem
Running natively with
LD_DEBUG=libsresults in:Running with
manticore --env LD_DEBUG=allresults in:test_00000000.stdout:
As you can see, it ignores all but the first path in .rpath and doesn't find the right C library.
Readelf sections:
Strace shows that it loads the right interpreter (ld-linux.so.2 links to ld-2.25.so):
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