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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
misc.cpp
)
file(GLOB AK_SOURCES "../../AK/*.cpp")
Libraries: Move to Userland/Libraries/
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file(GLOB ELF_SOURCES "../Libraries/LibELF/*.cpp")
file(GLOB LIBC_SOURCES1 "../Libraries/LibC/*.cpp")
file(GLOB LIBC_SOURCES2 "../Libraries/LibC/*/*.cpp")
LibC: Add x86_64 implementation of setjmp() and longjmp()
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if ("${SERENITY_ARCH}" STREQUAL "i686")
file(GLOB LIBC_SOURCES3 "../Libraries/LibC/arch/i386/*.S")
LibC: Add x86_64 Registers
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set(ELF_SOURCES ${ELF_SOURCES} ../Libraries/LibELF/Arch/i386/plt_trampoline.S)
LibC: Add x86_64 implementation of setjmp() and longjmp()
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elseif ("${SERENITY_ARCH}" STREQUAL "x86_64")
LibC: Add x86_64 Registers
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file(GLOB LIBC_SOURCES3 "../Libraries/LibC/arch/x86_64/*.S") # FIXME: this does not exist at this point!
set(ELF_SOURCES ${ELF_SOURCES} ../Libraries/LibELF/Arch/x86_64/plt_trampoline.S)
LibC: Add x86_64 implementation of setjmp() and longjmp()
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endif()
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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Userland: Port UBSAN implementation to userspace Take Kernel/UBSanitizer.cpp and make a copy in LibSanitizer. We can use LibSanitizer to hold other sanitizers as people implement them :^). To enable UBSAN for LibC, DynamicLoader, and other low level system libraries, LibUBSanitizer is built as a serenity_libc, and has a static version for LibCStatic to use. The approach is the same as that taken in Note that this means now UBSAN is enabled for code generators, Lagom, Kernel, and Userspace with -DENABLE_UNDEFINED_SANTIZER=ON. In userspace however, UBSAN is not deadly (yet). Co-authored-by: ForLoveOfCats <ForLoveOfCats@vivaldi.net>
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if (ENABLE_UNDEFINED_SANITIZER)
set(LOADER_SOURCES ${LOADER_SOURCES} ../Libraries/LibSanitizer/UBSanitizer.cpp)
endif()
LibC+LibPthread: Implement function forwarding for libpthread GCC will insert various calls to pthread functions when compiling C++ code with static initializers, even when the user doesn't link their program against libpthread explicitly. This is used to make static initializers thread-safe, e.g. when building a library that does not itself use thread functionality and thus does not link against libpthread - but is intended to be used with other code that does use libpthread explicitly. This makes these symbols available in libc.
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add_definitions(-D_DYNAMIC_LOADER)
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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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} ${LIBSYSTEM_SOURCES})
Loader: Add dynamic loader program The dynamic loader exists as /usr/lib/Loader.so and is loaded by the kernel when ET_DYN programs are executed. The dynamic loader is responsible for loading the dependencies of the main program, allocating TLS storage, preparing all loaded objects for execution and finally jumping to the entry of the main program.
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DynamicLoader: Remove math functionality in favor of -lgcc This links the dynamic linker against libgcc.a instead of having our own copy of the math functions. For now we need to specify -fbuilding-libgcc as a hack to work around a bug with the -nodefaultlibs flag. Once everyone is on the latest toolchain version this can be removed.
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# FIXME: Remove -fbuilding-libgcc after the next toolchain update
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fbuilding-libgcc -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: Remove math functionality in favor of -lgcc This links the dynamic linker against libgcc.a instead of having our own copy of the math functions. For now we need to specify -fbuilding-libgcc as a hack to work around a bug with the -nodefaultlibs flag. Once everyone is on the latest toolchain version this can be removed.
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target_link_libraries(Loader.so gcc)
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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