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ladybird/Userland/DynamicLoader/CMakeLists.txt

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Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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set(LOADER_SOURCES
main.cpp
Revert "DynamicLoader: Remove unnecessary math functions" This reverts commit b1f1f5afcf8f3b8a3ca10bcb6aefa05fbb2b35be. Unfortunately this broke dbgln() in the dynamic loader. We need to figure out how to link libgcc into it properly.
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math.cpp
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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misc.cpp
)
file(GLOB AK_SOURCES "../../AK/*.cpp")
Libraries: Move to Userland/Libraries/
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file(GLOB ELF_SOURCES "../Libraries/LibELF/*.cpp")
set(ELF_SOURCES ${ELF_SOURCES} ../Libraries/LibELF/Arch/i386/plt_trampoline.S)
file(GLOB LIBC_SOURCES1 "../Libraries/LibC/*.cpp")
file(GLOB LIBC_SOURCES2 "../Libraries/LibC/*/*.cpp")
file(GLOB LIBC_SOURCES3 "../Libraries/LibC/*.S")
Userland: Add LibSystem and funnel all syscalls through it This achieves two things: - Programs can now intentionally perform arbitrary syscalls by calling syscall(). This allows us to work on things like syscall fuzzing. - It restricts the ability of userspace to make syscalls to a single 4KB page of code. In order to call the kernel directly, an attacker must now locate this page and call through it.
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file(GLOB LIBSYSTEM_SOURCES "../Libraries/LibSystem/*.cpp")
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.cpp")
list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.+.cpp")
Userland: Add LibSystem and funnel all syscalls through it This achieves two things: - Programs can now intentionally perform arbitrary syscalls by calling syscall(). This allows us to work on things like syscall fuzzing. - It restricts the ability of userspace to make syscalls to a single 4KB page of code. In order to call the kernel directly, an attacker must now locate this page and call through it.
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set(SOURCES ${LOADER_SOURCES} ${AK_SOURCES} ${ELF_SOURCES} ${LIBC_SOURCES1} ${LIBC_SOURCES2} ${LIBC_SOURCES3} ${LIBSYSTEM_SOURCES})
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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Meta: Enable RTTI for Userspace programs RTTI is still disabled for the Kernel, and for the Dynamic Loader. This allows for much less awkward navigation of class heirarchies in LibCore, LibGUI, LibWeb, and LibJS (eventually). Measured RootFS size increase was < 1%, and libgui.so binary size was ~3.3%. The small binary size increase here seems worth it :^)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -nostdlib -pie -fpic -DNO_TLS")
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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Libraries: Move to Userland/Libraries/
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set_source_files_properties (../Libraries/LibC/ssp.cpp PROPERTIES COMPILE_FLAGS
Build + LibC: Enable -fstack-protector-strong in user space Modify the user mode runtime to insert stack canaries to find stack corruptions. The `-fstack-protector-strong` variant was chosen because it catches more issues than vanilla `-fstack-protector`, but doesn't have substantial performance impact like `-fstack-protector-all`. Details: -fstack-protector enables stack protection for vulnerable functions that contain: * A character array larger than 8 bytes. * An 8-bit integer array larger than 8 bytes. * A call to alloca() with either a variable size or a constant size bigger than 8 bytes. -fstack-protector-strong enables stack protection for vulnerable functions that contain: * An array of any size and type. * A call to alloca(). * A local variable that has its address taken. Example of it catching corrupting in the `stack-smash` test: ``` courage ~ $ ./user/Tests/LibC/stack-smash [+] Starting the stack smash ... Error: Stack protector failure, stack smashing detected! Shell: Job 1 (/usr/Tests/LibC/stack-smash) Aborted ```
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"-fno-stack-protector")
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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add_executable(Loader.so ${SOURCES})
DynamicLoader: Tell the linker to not add a PT_INTERP header Use the GNU LD option --no-dynamic-linker. This allows uncommenting some code in the Kernel that gets upset if your ELF interpreter has its own interpreter.
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target_link_options(Loader.so PRIVATE LINKER:--no-dynamic-linker)
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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install(TARGETS Loader.so RUNTIME DESTINATION usr/lib/)
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