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aef0148f36
When CONFIG_RETPOLINE is disabled, Clang uses a jump table for the switch statement in cmdline_find_option (jump tables are disabled when CONFIG_RETPOLINE is enabled). This function is called very early in boot from sme_enable() if CONFIG_AMD_MEM_ENCRYPT is enabled. At this time, the kernel is still executing out of the identity mapping, but the jump table will contain virtual addresses. Fix this by disabling jump tables for cmdline.c when AMD_MEM_ENCRYPT is enabled. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200903023056.3914690-1-nivedita@alum.mit.edu
73 lines
2.2 KiB
Makefile
73 lines
2.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for x86 specific library files.
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#
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# Produces uninteresting flaky coverage.
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KCOV_INSTRUMENT_delay.o := n
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# KCSAN uses udelay for introducing watchpoint delay; avoid recursion.
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KCSAN_SANITIZE_delay.o := n
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ifdef CONFIG_KCSAN
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# In case KCSAN+lockdep+ftrace are enabled, disable ftrace for delay.o to avoid
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# lockdep -> [other libs] -> KCSAN -> udelay -> ftrace -> lockdep recursion.
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CFLAGS_REMOVE_delay.o = $(CC_FLAGS_FTRACE)
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endif
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# Early boot use of cmdline; don't instrument it
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ifdef CONFIG_AMD_MEM_ENCRYPT
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KCOV_INSTRUMENT_cmdline.o := n
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KASAN_SANITIZE_cmdline.o := n
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KCSAN_SANITIZE_cmdline.o := n
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ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_cmdline.o = -pg
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endif
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CFLAGS_cmdline.o := -fno-stack-protector -fno-jump-tables
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endif
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inat_tables_script = $(srctree)/arch/x86/tools/gen-insn-attr-x86.awk
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inat_tables_maps = $(srctree)/arch/x86/lib/x86-opcode-map.txt
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quiet_cmd_inat_tables = GEN $@
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cmd_inat_tables = $(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@
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$(obj)/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
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$(call cmd,inat_tables)
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$(obj)/inat.o: $(obj)/inat-tables.c
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clean-files := inat-tables.c
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obj-$(CONFIG_SMP) += msr-smp.o cache-smp.o
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lib-y := delay.o misc.o cmdline.o cpu.o
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lib-y += usercopy_$(BITS).o usercopy.o getuser.o putuser.o
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lib-y += memcpy_$(BITS).o
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lib-$(CONFIG_INSTRUCTION_DECODER) += insn.o inat.o insn-eval.o
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lib-$(CONFIG_RANDOMIZE_BASE) += kaslr.o
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lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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lib-$(CONFIG_RETPOLINE) += retpoline.o
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obj-y += msr.o msr-reg.o msr-reg-export.o hweight.o
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obj-y += iomem.o
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ifeq ($(CONFIG_X86_32),y)
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obj-y += atomic64_32.o
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lib-y += atomic64_cx8_32.o
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lib-y += checksum_32.o
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lib-y += strstr_32.o
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lib-y += string_32.o
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ifneq ($(CONFIG_X86_CMPXCHG64),y)
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lib-y += cmpxchg8b_emu.o atomic64_386_32.o
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endif
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lib-$(CONFIG_X86_USE_3DNOW) += mmx_32.o
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else
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obj-y += iomap_copy_64.o
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lib-y += csum-partial_64.o csum-copy_64.o csum-wrappers_64.o
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lib-y += clear_page_64.o copy_page_64.o
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lib-y += memmove_64.o memset_64.o
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lib-y += copy_user_64.o
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lib-y += cmpxchg16b_emu.o
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endif
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