44a3813052
The Undefined Behavior Sanitizer can operate in two modes: warning
reporting mode via lib/ubsan.c handler calls, or trap mode, which uses
__builtin_trap() as the handler. Using lib/ubsan.c means the kernel
image is about 5% larger (due to all the debugging text and reporting
structures to capture details about the warning conditions). Using the
trap mode, the image size changes are much smaller, though at the loss
of the "warning only" mode.
In order to give greater flexibility to system builders that want
minimal changes to image size and are prepared to deal with kernel
threads being killed, this introduces CONFIG_UBSAN_TRAP. The resulting
image sizes comparison:
text data bss dec hex filename
19533663 6183037 18554956 44271656 2a38828 vmlinux.stock
19991849 7618513 18874448 46484810 2c54d4a vmlinux.ubsan
19712181 6284181 18366540 44362902 2a4ec96 vmlinux.ubsan-trap
CONFIG_UBSAN=y: image +4.8% (text +2.3%, data +18.9%)
CONFIG_UBSAN_TRAP=y: image +0.2% (text +0.9%, data +1.6%)
Bug: 136249967
Link: https://lore.kernel.org/kernel-hardening/20191121181519.28637-2-keescook@chromium.org/
Suggested-by: Elena Petrova <lenaptr@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Elena Petrova <lenaptr@google.com>
Change-Id: Ifa36d25f9649958cfc7b78e21777390f128db165
300 lines
9.6 KiB
Makefile
300 lines
9.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for some libs needed in the kernel.
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#
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ifdef CONFIG_FUNCTION_TRACER
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ORIG_CFLAGS := $(KBUILD_CFLAGS)
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KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
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endif
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# These files are disabled because they produce lots of non-interesting and/or
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# flaky coverage that is not a function of syscall inputs. For example,
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# rbtree can be global and individual rotations don't correlate with inputs.
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KCOV_INSTRUMENT_string.o := n
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KCOV_INSTRUMENT_rbtree.o := n
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KCOV_INSTRUMENT_list_debug.o := n
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KCOV_INSTRUMENT_debugobjects.o := n
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KCOV_INSTRUMENT_dynamic_debug.o := n
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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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KASAN_SANITIZE_string.o := n
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CFLAGS_string.o := $(call cc-option, -fno-stack-protector)
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endif
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lib-y := ctype.o string.o vsprintf.o cmdline.o \
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rbtree.o radix-tree.o timerqueue.o xarray.o \
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idr.o extable.o sha1.o irq_regs.o argv_split.o \
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flex_proportions.o ratelimit.o show_mem.o \
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is_single_threaded.o plist.o decompress.o kobject_uevent.o \
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earlycpio.o seq_buf.o siphash.o dec_and_lock.o \
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nmi_backtrace.o nodemask.o win_minmax.o memcat_p.o
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lib-$(CONFIG_PRINTK) += dump_stack.o
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lib-$(CONFIG_MMU) += ioremap.o
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lib-$(CONFIG_SMP) += cpumask.o
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lib-y += kobject.o klist.o
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obj-y += lockref.o
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obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \
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bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \
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list_sort.o uuid.o iov_iter.o clz_ctz.o \
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bsearch.o find_bit.o llist.o memweight.o kfifo.o \
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percpu-refcount.o rhashtable.o \
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once.o refcount.o usercopy.o errseq.o bucket_locks.o \
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generic-radix-tree.o
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obj-$(CONFIG_STRING_SELFTEST) += test_string.o
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obj-y += string_helpers.o
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obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o
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obj-y += hexdump.o
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obj-$(CONFIG_TEST_HEXDUMP) += test_hexdump.o
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obj-y += kstrtox.o
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obj-$(CONFIG_FIND_BIT_BENCHMARK) += find_bit_benchmark.o
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obj-$(CONFIG_TEST_BPF) += test_bpf.o
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obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
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obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
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obj-$(CONFIG_TEST_HASH) += test_hash.o test_siphash.o
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obj-$(CONFIG_TEST_IDA) += test_ida.o
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obj-$(CONFIG_TEST_KASAN) += test_kasan.o
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CFLAGS_test_kasan.o += -fno-builtin
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CFLAGS_test_kasan.o += $(call cc-disable-warning, vla)
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obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
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CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla)
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UBSAN_SANITIZE_test_ubsan.o := y
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obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
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obj-$(CONFIG_TEST_LIST_SORT) += test_list_sort.o
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obj-$(CONFIG_TEST_LKM) += test_module.o
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obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
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obj-$(CONFIG_TEST_OVERFLOW) += test_overflow.o
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obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.o
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obj-$(CONFIG_TEST_SORT) += test_sort.o
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obj-$(CONFIG_TEST_USER_COPY) += test_user_copy.o
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obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_keys.o
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obj-$(CONFIG_TEST_STATIC_KEYS) += test_static_key_base.o
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obj-$(CONFIG_TEST_PRINTF) += test_printf.o
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obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
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obj-$(CONFIG_TEST_STRSCPY) += test_strscpy.o
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obj-$(CONFIG_TEST_BITFIELD) += test_bitfield.o
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obj-$(CONFIG_TEST_UUID) += test_uuid.o
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obj-$(CONFIG_TEST_XARRAY) += test_xarray.o
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obj-$(CONFIG_TEST_PARMAN) += test_parman.o
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obj-$(CONFIG_TEST_KMOD) += test_kmod.o
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obj-$(CONFIG_TEST_DEBUG_VIRTUAL) += test_debug_virtual.o
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obj-$(CONFIG_TEST_MEMCAT_P) += test_memcat_p.o
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obj-$(CONFIG_TEST_OBJAGG) += test_objagg.o
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obj-$(CONFIG_TEST_STACKINIT) += test_stackinit.o
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obj-$(CONFIG_TEST_BLACKHOLE_DEV) += test_blackhole_dev.o
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obj-$(CONFIG_TEST_MEMINIT) += test_meminit.o
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obj-$(CONFIG_TEST_LIVEPATCH) += livepatch/
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obj-$(CONFIG_KUNIT) += kunit/
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ifeq ($(CONFIG_DEBUG_KOBJECT),y)
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CFLAGS_kobject.o += -DDEBUG
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CFLAGS_kobject_uevent.o += -DDEBUG
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endif
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obj-$(CONFIG_DEBUG_INFO_REDUCED) += debug_info.o
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CFLAGS_debug_info.o += $(call cc-option, -femit-struct-debug-detailed=any)
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obj-y += math/ crypto/
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obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
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obj-$(CONFIG_GENERIC_PCI_IOMAP) += pci_iomap.o
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obj-$(CONFIG_HAS_IOMEM) += iomap_copy.o devres.o
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obj-$(CONFIG_CHECK_SIGNATURE) += check_signature.o
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obj-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
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lib-y += logic_pio.o
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obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
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obj-$(CONFIG_BTREE) += btree.o
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obj-$(CONFIG_INTERVAL_TREE) += interval_tree.o
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obj-$(CONFIG_ASSOCIATIVE_ARRAY) += assoc_array.o
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obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
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obj-$(CONFIG_DEBUG_LIST) += list_debug.o
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obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
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obj-$(CONFIG_BITREVERSE) += bitrev.o
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obj-$(CONFIG_PACKING) += packing.o
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obj-$(CONFIG_CRC_CCITT) += crc-ccitt.o
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obj-$(CONFIG_CRC16) += crc16.o
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obj-$(CONFIG_CRC_T10DIF)+= crc-t10dif.o
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obj-$(CONFIG_CRC_ITU_T) += crc-itu-t.o
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obj-$(CONFIG_CRC32) += crc32.o
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obj-$(CONFIG_CRC64) += crc64.o
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obj-$(CONFIG_CRC32_SELFTEST) += crc32test.o
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obj-$(CONFIG_CRC4) += crc4.o
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obj-$(CONFIG_CRC7) += crc7.o
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obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
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obj-$(CONFIG_CRC8) += crc8.o
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obj-$(CONFIG_XXHASH) += xxhash.o
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obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
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obj-$(CONFIG_842_COMPRESS) += 842/
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obj-$(CONFIG_842_DECOMPRESS) += 842/
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obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
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obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/
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obj-$(CONFIG_REED_SOLOMON) += reed_solomon/
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obj-$(CONFIG_BCH) += bch.o
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obj-$(CONFIG_LZO_COMPRESS) += lzo/
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obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
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obj-$(CONFIG_LZ4_COMPRESS) += lz4/
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obj-$(CONFIG_LZ4HC_COMPRESS) += lz4/
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obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/
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obj-$(CONFIG_ZSTD_COMPRESS) += zstd/
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obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd/
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obj-$(CONFIG_XZ_DEC) += xz/
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obj-$(CONFIG_RAID6_PQ) += raid6/
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lib-$(CONFIG_DECOMPRESS_GZIP) += decompress_inflate.o
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lib-$(CONFIG_DECOMPRESS_BZIP2) += decompress_bunzip2.o
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lib-$(CONFIG_DECOMPRESS_LZMA) += decompress_unlzma.o
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lib-$(CONFIG_DECOMPRESS_XZ) += decompress_unxz.o
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lib-$(CONFIG_DECOMPRESS_LZO) += decompress_unlzo.o
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lib-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o
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obj-$(CONFIG_TEXTSEARCH) += textsearch.o
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obj-$(CONFIG_TEXTSEARCH_KMP) += ts_kmp.o
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obj-$(CONFIG_TEXTSEARCH_BM) += ts_bm.o
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obj-$(CONFIG_TEXTSEARCH_FSM) += ts_fsm.o
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obj-$(CONFIG_SMP) += percpu_counter.o
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obj-$(CONFIG_AUDIT_GENERIC) += audit.o
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obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o
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obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o
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obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o
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obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o
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obj-$(CONFIG_PM_NOTIFIER_ERROR_INJECT) += pm-notifier-error-inject.o
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obj-$(CONFIG_NETDEV_NOTIFIER_ERROR_INJECT) += netdev-notifier-error-inject.o
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obj-$(CONFIG_MEMORY_NOTIFIER_ERROR_INJECT) += memory-notifier-error-inject.o
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obj-$(CONFIG_OF_RECONFIG_NOTIFIER_ERROR_INJECT) += \
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of-reconfig-notifier-error-inject.o
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obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o
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lib-$(CONFIG_GENERIC_BUG) += bug.o
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obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
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obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o
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obj-$(CONFIG_SYMBOLIC_ERRNAME) += errname.o
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obj-$(CONFIG_NLATTR) += nlattr.o
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obj-$(CONFIG_LRU_CACHE) += lru_cache.o
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obj-$(CONFIG_GENERIC_CSUM) += checksum.o
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obj-$(CONFIG_GENERIC_ATOMIC64) += atomic64.o
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obj-$(CONFIG_ATOMIC64_SELFTEST) += atomic64_test.o
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obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
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obj-$(CONFIG_DQL) += dynamic_queue_limits.o
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obj-$(CONFIG_GLOB) += glob.o
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obj-$(CONFIG_GLOB_SELFTEST) += globtest.o
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obj-$(CONFIG_MPILIB) += mpi/
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obj-$(CONFIG_DIMLIB) += dim/
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obj-$(CONFIG_SIGNATURE) += digsig.o
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lib-$(CONFIG_CLZ_TAB) += clz_tab.o
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obj-$(CONFIG_GENERIC_STRNCPY_FROM_USER) += strncpy_from_user.o
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obj-$(CONFIG_GENERIC_STRNLEN_USER) += strnlen_user.o
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obj-$(CONFIG_GENERIC_NET_UTILS) += net_utils.o
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obj-$(CONFIG_SG_SPLIT) += sg_split.o
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obj-$(CONFIG_SG_POOL) += sg_pool.o
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obj-$(CONFIG_MEMREGION) += memregion.o
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obj-$(CONFIG_STMP_DEVICE) += stmp_device.o
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obj-$(CONFIG_IRQ_POLL) += irq_poll.o
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obj-$(CONFIG_STACKDEPOT) += stackdepot.o
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KASAN_SANITIZE_stackdepot.o := n
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KCOV_INSTRUMENT_stackdepot.o := n
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libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
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fdt_empty_tree.o
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$(foreach file, $(libfdt_files), \
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$(eval CFLAGS_$(file) = -I $(srctree)/scripts/dtc/libfdt))
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lib-$(CONFIG_LIBFDT) += $(libfdt_files)
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obj-$(CONFIG_RBTREE_TEST) += rbtree_test.o
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obj-$(CONFIG_INTERVAL_TREE_TEST) += interval_tree_test.o
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obj-$(CONFIG_PERCPU_TEST) += percpu_test.o
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obj-$(CONFIG_ASN1) += asn1_decoder.o
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obj-$(CONFIG_FONT_SUPPORT) += fonts/
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hostprogs-y := gen_crc32table
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hostprogs-y += gen_crc64table
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clean-files := crc32table.h
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clean-files += crc64table.h
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$(obj)/crc32.o: $(obj)/crc32table.h
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quiet_cmd_crc32 = GEN $@
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cmd_crc32 = $< > $@
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$(obj)/crc32table.h: $(obj)/gen_crc32table
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$(call cmd,crc32)
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$(obj)/crc64.o: $(obj)/crc64table.h
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quiet_cmd_crc64 = GEN $@
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cmd_crc64 = $< > $@
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$(obj)/crc64table.h: $(obj)/gen_crc64table
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$(call cmd,crc64)
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#
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# Build a fast OID lookip registry from include/linux/oid_registry.h
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#
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obj-$(CONFIG_OID_REGISTRY) += oid_registry.o
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$(obj)/oid_registry.o: $(obj)/oid_registry_data.c
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$(obj)/oid_registry_data.c: $(srctree)/include/linux/oid_registry.h \
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$(src)/build_OID_registry
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$(call cmd,build_OID_registry)
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quiet_cmd_build_OID_registry = GEN $@
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cmd_build_OID_registry = perl $(srctree)/$(src)/build_OID_registry $< $@
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clean-files += oid_registry_data.c
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obj-$(CONFIG_UCS2_STRING) += ucs2_string.o
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ifneq ($(CONFIG_UBSAN_TRAP),y)
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obj-$(CONFIG_UBSAN) += ubsan.o
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endif
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UBSAN_SANITIZE_ubsan.o := n
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KASAN_SANITIZE_ubsan.o := n
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CFLAGS_ubsan.o := $(call cc-option, -fno-stack-protector) $(DISABLE_STACKLEAK_PLUGIN)
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obj-$(CONFIG_SBITMAP) += sbitmap.o
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obj-$(CONFIG_PARMAN) += parman.o
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# GCC library routines
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obj-$(CONFIG_GENERIC_LIB_ASHLDI3) += ashldi3.o
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obj-$(CONFIG_GENERIC_LIB_ASHRDI3) += ashrdi3.o
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obj-$(CONFIG_GENERIC_LIB_LSHRDI3) += lshrdi3.o
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obj-$(CONFIG_GENERIC_LIB_MULDI3) += muldi3.o
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obj-$(CONFIG_GENERIC_LIB_CMPDI2) += cmpdi2.o
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obj-$(CONFIG_GENERIC_LIB_UCMPDI2) += ucmpdi2.o
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obj-$(CONFIG_OBJAGG) += objagg.o
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# KUnit tests
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obj-$(CONFIG_LIST_KUNIT_TEST) += list-test.o
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