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Kernel: KUBSAN! (Kernel Undefined Behavior SANitizer) :^)

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We now build the kernel with partial UBSAN support.
The following -fsanitize sub-options are enabled:

* nonnull-attribute
* bool

If the kernel detects UB at runtime, it will now print a debug message
with a stack trace. This is very cool! I'm leaving it on by default for
now, but we'll probably have to re-evaluate this as more options are
enabled and slowdown increases.
This commit is contained in:
Andreas Kling 2021-02-05 19:44:26 +01:00
parent 7df3b95126
commit d44be96893
3 changed files with 135 additions and 0 deletions
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2
Kernel/CMakeLists.txt
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@ -197,6 +197,7 @@ set(KERNEL_SOURCES
Time/RTC.cpp
Time/TimeManagement.cpp
TimerQueue.cpp
UBSanitizer.cpp
UserOrKernelBuffer.cpp
VM/AnonymousVMObject.cpp
VM/ContiguousVMObject.cpp
@ -269,6 +270,7 @@ set(SOURCES
${C_SOURCES}
)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=nonnull-attribute,bool")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DKERNEL")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pie -fPIE -fno-rtti -ffreestanding -fbuiltin")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mno-80387 -mno-mmx -mno-sse -mno-sse2")