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Userland: Add LibSystem and funnel all syscalls through it

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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.
This commit is contained in:
Andreas Kling 2021-02-05 12:16:30 +01:00
parent 4df3a34bc2
commit e87eac9273
47 changed files with 164 additions and 47 deletions
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3
Userland/DynamicLoader/CMakeLists.txt
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@ -10,11 +10,12 @@ 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")
file(GLOB LIBSYSTEM_SOURCES "../Libraries/LibSystem/*.cpp")
list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.cpp")
list(FILTER LIBC_SOURCES1 EXCLUDE REGEX ".+crt0.+.cpp")
set(SOURCES ${LOADER_SOURCES} ${AK_SOURCES} ${ELF_SOURCES} ${LIBC_SOURCES1} ${LIBC_SOURCES2} ${LIBC_SOURCES3})
set(SOURCES ${LOADER_SOURCES} ${AK_SOURCES} ${ELF_SOURCES} ${LIBC_SOURCES1} ${LIBC_SOURCES2} ${LIBC_SOURCES3} ${LIBSYSTEM_SOURCES})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti -nostdlib -pie -fpic -DNO_TLS")