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e75a698859
objtool warns about some suspicous code inside of kmsan:
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_n+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_n+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_1+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_1+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_2+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_2+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_4+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_4+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_load_8+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_metadata_ptr_for_store_8+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_instrument_asm_store+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_chain_origin+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_poison_alloca+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_warning+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: __msan_get_context_state+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: kmsan_copy_to_user+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: kmsan_unpoison_memory+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: kmsan_unpoison_entry_regs+0x4: call to __fentry__() with UACCESS enabled
vmlinux.o: warning: objtool: kmsan_report+0x4: call to __fentry__() with UACCESS enabled
The Makefile contained a line to turn off ftrace for the entire directory,
but this does not work. Replace it with individual lines, matching the
approach in kasan.
Link: https://lkml.kernel.org/r/20230215130058.3836177-3-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: f80be4571b ("kmsan: add KMSAN runtime core")
Acked-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: Marco Elver <elver@google.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
35 lines
1.1 KiB
Makefile
35 lines
1.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for KernelMemorySanitizer (KMSAN).
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#
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#
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obj-y := core.o instrumentation.o init.o hooks.o report.o shadow.o
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KMSAN_SANITIZE := n
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KCOV_INSTRUMENT := n
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UBSAN_SANITIZE := n
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# Disable instrumentation of KMSAN runtime with other tools.
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CC_FLAGS_KMSAN_RUNTIME := -fno-stack-protector
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CC_FLAGS_KMSAN_RUNTIME += $(call cc-option,-fno-conserve-stack)
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CC_FLAGS_KMSAN_RUNTIME += -DDISABLE_BRANCH_PROFILING
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# Disable ftrace to avoid recursion.
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CFLAGS_REMOVE_core.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_hooks.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_init.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_instrumentation.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_report.o = $(CC_FLAGS_FTRACE)
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CFLAGS_REMOVE_shadow.o = $(CC_FLAGS_FTRACE)
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CFLAGS_core.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_hooks.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_init.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_instrumentation.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_report.o := $(CC_FLAGS_KMSAN_RUNTIME)
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CFLAGS_shadow.o := $(CC_FLAGS_KMSAN_RUNTIME)
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obj-$(CONFIG_KMSAN_KUNIT_TEST) += kmsan_test.o
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KMSAN_SANITIZE_kmsan_test.o := y
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CFLAGS_kmsan_test.o += $(call cc-disable-warning, uninitialized)
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