mirror of
https://github.com/RGBCube/serenity
synced 2025-06-01 03:08:13 +00:00
06da50afc7
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
```
26 lines
976 B
CMake
26 lines
976 B
CMake
set(LOADER_SOURCES
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main.cpp
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math.cpp
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misc.cpp
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)
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file(GLOB AK_SOURCES "../../AK/*.cpp")
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file(GLOB ELF_SOURCES "../../Libraries/LibELF/*.cpp")
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set(ELF_SOURCES ${ELF_SOURCES} ../../Libraries/LibELF/Arch/i386/plt_trampoline.S)
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file(GLOB LIBC_SOURCES1 "../../Libraries/LibC/*.cpp")
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file(GLOB LIBC_SOURCES2 "../../Libraries/LibC/*/*.cpp")
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file(GLOB LIBC_SOURCES3 "../../Libraries/LibC/*.S")
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list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.cpp")
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list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.+.cpp")
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set(SOURCES ${LOADER_SOURCES} ${AK_SOURCES} ${ELF_SOURCES} ${LIBC_SOURCES1} ${LIBC_SOURCES2} ${LIBC_SOURCES3})
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -nostdlib -pie -fpic -DNO_TLS")
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set_source_files_properties (../../Libraries/LibC/ssp.cpp PROPERTIES COMPILE_FLAGS
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"-fno-stack-protector")
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add_executable(Loader.so ${SOURCES})
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target_link_options(Loader.so PRIVATE LINKER:--no-dynamic-linker)
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install(TARGETS Loader.so RUNTIME DESTINATION usr/lib/)
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