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5e88c48cb4
Variable Length Arrays (VLAs) on the stack must not be used in the kernel.
Function parameter VLAs[1] should be usable, but -Wvla will warn for
those. For example, this will produce a warning but it is not using a
stack VLA:
int something(size_t n, int array[n]) { ...
Clang has no way yet to distinguish between the VLA types[2], so
depend on GCC for now to keep stack VLAs out of the tree by using GCC's
-Wvla-larger-than=N option (though GCC may split -Wvla similarly[3] to
how Clang is planning to).
While GCC 8+ supports -Wvla-larger-than, only 9+ supports ...=0[4],
so use -Wvla-larger-than=1. Adjust mm/kasan/Makefile to remove it from
CFLAGS (GCC <9 appears unable to disable the warning correctly[5]).
The VLA usage in lib/test_ubsan.c was removed in commit 9d7ca61b13
("lib/test_ubsan.c: VLA no longer used in kernel") so the lib/Makefile
disabling of VLA checking can be entirely removed.
Link: https://en.cppreference.com/w/c/language/array [1]
Link: https://github.com/llvm/llvm-project/issues/57098 [2]
Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98217 [3]
Link: https://lore.kernel.org/lkml/7780883c-0ac8-4aaa-b850-469e33b50672@linux.ibm.com/ [4]
Link: https://lore.kernel.org/r/202505071331.4iOzqmuE-lkp@intel.com/ [5]
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Link: https://lore.kernel.org/r/20250418213235.work.532-kees@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
364 lines
12 KiB
Makefile
364 lines
12 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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ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
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# Branch profiling isn't noinstr-safe
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ifdef CONFIG_TRACE_BRANCH_PROFILING
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CFLAGS_smp_processor_id.o += -DDISABLE_BRANCH_PROFILING
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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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KCOV_INSTRUMENT_fault-inject.o := n
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KCOV_INSTRUMENT_find_bit.o := n
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# string.o implements standard library functions like memset/memcpy etc.
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# Use -ffreestanding to ensure that the compiler does not try to "optimize"
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# them into calls to themselves.
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CFLAGS_string.o := -ffreestanding
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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 += -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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maple_tree.o idr.o extable.o irq_regs.o argv_split.o \
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flex_proportions.o ratelimit.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 win_minmax.o memcat_p.o \
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buildid.o objpool.o iomem_copy.o
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lib-$(CONFIG_UNION_FIND) += union_find.o
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lib-$(CONFIG_PRINTK) += dump_stack.o
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lib-$(CONFIG_SMP) += cpumask.o
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lib-$(CONFIG_MIN_HEAP) += min_heap.o
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lib-y += kobject.o klist.o
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obj-y += lockref.o
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obj-y += bcd.o sort.o parser.o debug_locks.o random32.o \
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bust_spinlocks.o kasprintf.o bitmap.o scatterlist.o \
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list_sort.o uuid.o iov_iter.o clz_ctz.o \
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bsearch.o find_bit.o llist.o lwq.o memweight.o kfifo.o \
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percpu-refcount.o rhashtable.o base64.o \
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once.o refcount.o rcuref.o usercopy.o errseq.o bucket_locks.o \
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generic-radix-tree.o bitmap-str.o
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obj-y += string_helpers.o
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obj-y += hexdump.o
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obj-$(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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test_dhry-objs := dhry_1.o dhry_2.o dhry_run.o
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obj-$(CONFIG_TEST_DHRY) += test_dhry.o
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obj-$(CONFIG_TEST_FIRMWARE) += test_firmware.o
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obj-$(CONFIG_TEST_BITOPS) += test_bitops.o
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CFLAGS_test_bitops.o += -Werror
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obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
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obj-$(CONFIG_TEST_IDA) += test_ida.o
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obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
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CFLAGS_test_ubsan.o += $(call cc-disable-warning, unused-but-set-variable)
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UBSAN_SANITIZE_test_ubsan.o := y
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obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
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obj-$(CONFIG_TEST_MIN_HEAP) += test_min_heap.o
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obj-$(CONFIG_TEST_LKM) += test_module.o
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obj-$(CONFIG_TEST_VMALLOC) += test_vmalloc.o
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obj-$(CONFIG_TEST_RHASHTABLE) += test_rhashtable.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-$(CONFIG_TEST_DYNAMIC_DEBUG) += test_dynamic_debug.o
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obj-$(CONFIG_TEST_BITMAP) += test_bitmap.o
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ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_KASAN),yy)
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# FIXME: Clang breaks test_bitmap_const_eval when KASAN and GCOV are enabled
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GCOV_PROFILE_test_bitmap.o := n
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endif
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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-$(CONFIG_TEST_MAPLE_TREE) += test_maple_tree.o
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obj-$(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-$(CONFIG_TEST_MEMINIT) += test_meminit.o
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obj-$(CONFIG_TEST_LOCKUP) += test_lockup.o
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obj-$(CONFIG_TEST_HMM) += test_hmm.o
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obj-$(CONFIG_TEST_FREE_PAGES) += test_free_pages.o
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obj-$(CONFIG_TEST_REF_TRACKER) += test_ref_tracker.o
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obj-$(CONFIG_TEST_OBJPOOL) += test_objpool.o
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obj-$(CONFIG_TEST_FPU) += test_fpu.o
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test_fpu-y := test_fpu_glue.o test_fpu_impl.o
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CFLAGS_test_fpu_impl.o += $(CC_FLAGS_FPU)
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CFLAGS_REMOVE_test_fpu_impl.o += $(CC_FLAGS_NO_FPU)
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# Some KUnit files (hooks.o) need to be built-in even when KUnit is a module,
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# so we can't just use obj-$(CONFIG_KUNIT).
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ifdef CONFIG_KUNIT
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obj-y += kunit/
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endif
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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 += $(call cc-option, -femit-struct-debug-detailed=any)
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obj-y += math/ crypto/ tests/ vdso/
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obj-$(CONFIG_GENERIC_IOMAP) += 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-$(CONFIG_DEBUG_LOCKING_API_SELFTESTS) += locking-selftest.o
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lib-y += logic_pio.o
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lib-$(CONFIG_INDIRECT_IOMEM) += logic_iomem.o
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obj-$(CONFIG_TRACE_MMIO_ACCESS) += trace_readwrite.o
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obj-$(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-$(CONFIG_LIST_HARDENED) += list_debug.o
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obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
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obj-$(CONFIG_BITREVERSE) += bitrev.o
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obj-$(CONFIG_LINEAR_RANGES) += linear_ranges.o
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obj-$(CONFIG_PACKING) += packing.o
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obj-$(CONFIG_PACKING_KUNIT_TEST) += packing_test.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-$(CONFIG_CRC4) += crc4.o
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obj-$(CONFIG_CRC7) += crc7.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_ZLIB_DFLTCC) += zlib_dfltcc/
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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-$(CONFIG_DECOMPRESS_LZ4) += decompress_unlz4.o
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lib-$(CONFIG_DECOMPRESS_ZSTD) += decompress_unzstd.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_FAULT_INJECTION_USERCOPY) += fault-inject-usercopy.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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obj-$(CONFIG_CODE_TAGGING) += codetag.o
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obj-$(CONFIG_MEM_ALLOC_PROFILING) += alloc_tag.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-$(CONFIG_ARCH_NEED_CMPXCHG_1_EMU) += cmpxchg-emu.o
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obj-$(CONFIG_DYNAMIC_DEBUG_CORE) += dynamic_debug.o
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#ensure exported functions have prototypes
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CFLAGS_dynamic_debug.o := -DDYNAMIC_DEBUG_MODULE
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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_CLOSURES) += closure.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_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-$(CONFIG_POLYNOMIAL) += polynomial.o
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# stackdepot.c should not be instrumented or call instrumented functions.
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# Prevent the compiler from calling builtins like memcmp() or bcmp() from this
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# file.
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CFLAGS_stackdepot.o += -fno-builtin
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obj-$(CONFIG_STACKDEPOT) += stackdepot.o
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KASAN_SANITIZE_stackdepot.o := n
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# In particular, instrumenting stackdepot.c with KMSAN will result in infinite
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# recursion.
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KMSAN_SANITIZE_stackdepot.o := n
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KCOV_INSTRUMENT_stackdepot.o := n
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obj-$(CONFIG_REF_TRACKER) += ref_tracker.o
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libfdt_files = fdt.o fdt_ro.o fdt_wip.o fdt_rw.o fdt_sw.o fdt_strerror.o \
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fdt_empty_tree.o fdt_addresses.o
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$(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_BOOT_CONFIG) += bootconfig.o
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obj-$(CONFIG_BOOT_CONFIG_EMBED) += bootconfig-data.o
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$(obj)/bootconfig-data.o: $(obj)/default.bconf
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targets += default.bconf
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filechk_defbconf = cat $(or $(real-prereqs), /dev/null)
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$(obj)/default.bconf: $(CONFIG_BOOT_CONFIG_EMBED_FILE) FORCE
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$(call filechk,defbconf)
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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-$(CONFIG_ASN1_ENCODER) += asn1_encoder.o
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obj-$(CONFIG_FONT_SUPPORT) += fonts/
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hostprogs := gen_crc32table
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hostprogs += 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 $(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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obj-$(CONFIG_UBSAN) += ubsan.o
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UBSAN_SANITIZE_ubsan.o := n
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KASAN_SANITIZE_ubsan.o := n
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KCSAN_SANITIZE_ubsan.o := n
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CFLAGS_ubsan.o := -fno-stack-protector $(DISABLE_STACKLEAK_PLUGIN)
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obj-$(CONFIG_SBITMAP) += sbitmap.o
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obj-$(CONFIG_PARMAN) += parman.o
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obj-y += group_cpus.o
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# GCC library routines
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obj-$(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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# pldmfw library
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obj-$(CONFIG_PLDMFW) += pldmfw/
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obj-$(CONFIG_GENERIC_LIB_DEVMEM_IS_ALLOWED) += devmem_is_allowed.o
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obj-$(CONFIG_FIRMWARE_TABLE) += fw_table.o
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subdir-$(CONFIG_FORTIFY_SOURCE) += test_fortify
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