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https://github.com/andreas-abel/nanoBench.git
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e13f0aee33
While build nanoBench kernel module in Ubuntu 22.04, gcc is with -mfunction-return=thunk-extern as default option. According to chapter 6.1.1 JMP2RET in the following reference: https://www.amd.com/system/files/documents/\ technical-guidance-for-mitigating-branch-type-confusion.pdf all 'ret' instructions are consolidated into a single piece of code. Instead of functions ending with a 'ret' instruction, they instead end with "jump __x86_return_thunk". Since a 'jmp' instruction is provided instead of 'ret' at the end of each function, it cause functions like create_runtime_code() copy much more assembler code into runtime_code memory than it should during runtime. Memory protection fault happens finally while running. To address the above issue, option -mfunction-return=keep is provided for kernel mode to overwrite the gcc default behavior in Ubuntu 22.04. This can ensure function has 'ret' instruction generated. Signed-off-by: Cathy Zhang <cathy.zhang@intel.com>
28 lines
889 B
Makefile
28 lines
889 B
Makefile
MODULE_NAME = nb
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BUILD_DIR = /lib/modules/$(shell uname -r)/build
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HEADERS_EXIST = $(shell if [ -d "${BUILD_DIR}" ]; then echo "${BUILD_DIR}"; \
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else echo ""; fi)
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ifneq (${HEADERS_EXIST}, ${BUILD_DIR})
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$(warning "Check you have linux headers installed")
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$(error "${BUILD_DIR} does not exist!")
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endif
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SRC := nb_km.c ../common/nanoBench.c
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$(MODULE_NAME)-objs += $(SRC:.c=.o)
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obj-m += $(MODULE_NAME).o
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ccflags-y+=-std=gnu99 -Wno-declaration-after-statement -Wno-vla -isystem $(shell $(CC) -print-file-name=include) -mfunction-return=keep
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OBJECT_FILES_NON_STANDARD := y
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all:
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make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
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clean:
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rm -f ../common/*.o ../common/*.ur-safe ../common/*.dwo ../common/.nanoBench.*
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rm -rf *.o *.ko *.mod *.mod.c *.ur-safe *.dwo .tmp_versions .cache.mk .nb.* .nb_km.* .modules.* .Module.* modules.order Module.symvers
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