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Kees Cook 5e88c48cb4 kbuild: Switch from -Wvla to -Wvla-larger-than=1 
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>
2025-05-08 09:42:06 -07:00
..
atomic
locking/atomic: scripts: fix ${atomic}_sub_and_test() kerneldoc
2024-06-05 15:52:34 +02:00
bash-completion
kbuild: add Kbuild bash completion
2025-03-15 21:22:52 +09:00
basic
fixdep: use xmalloc()
2024-09-01 20:34:49 +09:00
clang-tools
gen_compile_commands.py: remove code for '\#' replacement
2025-03-15 21:16:21 +09:00
coccinelle
Merge tag 'mm-nonmm-stable-2025-03-30-18-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 10:06:52 -07:00
dtc
dt: dt-extract-compatibles: Extract compatibles from function parameters
2024-09-05 10:17:03 -05:00
dummy-tools
kbuild: dummy-tools: pretend we understand -fpatchable-function-entry
2023-11-01 23:24:56 +09:00
gcc-plugins
gcc-plugins: Remove ARM_SSP_PER_TASK plugin
2025-04-28 10:32:43 -07:00
gdb
Merge tag 'mm-nonmm-stable-2025-03-30-18-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
2025-04-01 10:06:52 -07:00
gendwarfksyms
gendwarfksyms: Add a separate pass to resolve FQNs
2025-03-15 21:16:11 +09:00
genksyms
genksyms: Handle typeof_unqual keyword and __seg_{fs,gs} qualifiers
2025-04-14 09:19:04 +02:00
include
scripts: import more list macros
2024-10-07 02:12:27 +09:00
ipe
scripts: ipe: polgen: remove redundant close and error exit path
2024-11-19 13:57:03 -08:00
kconfig
kconfig: merge_config: use an empty file as initfile
2025-04-06 06:22:01 +09:00
ksymoops
…
lib/abi
docs: ABI: move README contents to the top
2025-02-13 09:47:44 -07:00
mod
Disable SLUB_TINY for build testing
2025-04-06 10:00:04 -07:00
package
kbuild: rpm-pkg: build a debuginfo RPM
2025-04-06 06:22:01 +09:00
selinux
selinux: Chain up tool resolving errors in install_policy.sh
2025-03-07 14:38:34 -05:00
tracing
scripts/tracing: Remove scripts/tracing/draw_functrace.py
2025-03-20 07:02:21 -04:00
.gitignore
lib: packing: add pack_fields() and unpack_fields()
2024-12-11 20:13:00 -08:00
as-version.sh
kbuild: Update assembler calls to use proper flags and language target
2023-01-26 12:41:38 +09:00
asn1_compiler.c
ASN.1: Fix check for strdup() success
2023-04-21 08:58:00 -07:00
bloat-o-meter
scripts/bloat-o-meter: count weak symbol sizes
2023-08-21 13:46:25 -07:00
bootgraph.pl
…
bpf_doc.py
bpf: Allow specifying bpf_fastcall attribute for BPF helpers
2024-10-03 17:47:53 -07:00
build-version
kbuild: move init/build-version to scripts/
2024-07-16 01:08:37 +09:00
cc-can-link.sh
…
cc-version.sh
scripts: Remove ICC-related dead code
2023-04-24 10:18:32 -07:00
check_extable.sh
scripts: check_extable: fix typo in user error message
2021-09-08 11:50:28 -07:00
check-git
kbuild: use git-archive for source package creation
2023-03-16 22:46:12 +09:00
check-sysctl-docs
scripts: check-sysctl-docs: handle per-namespace sysctls
2024-02-23 12:13:09 +01:00
check-uapi.sh
check-uapi: Introduce check-uapi.sh
2023-12-29 22:25:20 +09:00
check-variable-fonts.sh
docs: scripts/check-variable-fonts.sh: Improve commands for detection
2024-05-02 10:14:52 -06:00
checkdeclares.pl
…
checkincludes.pl
…
checkkconfigsymbols.py
scripts: handle BrokenPipeError for python scripts
2023-01-26 12:43:33 +09:00
checkpatch.pl
Merge tag 'kbuild-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-04-05 15:46:50 -07:00
checkstack.pl
scripts/checkstack.pl: fix no space expression between sp and offset
2023-12-29 12:22:28 -08:00
checksyscalls.sh
checksyscalls: ignore fstat to silence build warning on LoongArch
2023-03-23 17:18:32 -07:00
checktransupdate.py
scripts: fix all issues reported by pylint
2024-07-29 15:34:22 -06:00
checkversion.pl
…
cleanfile
…
cleanpatch
…
coccicheck
kbuild: change working directory to external module directory with M=
2024-11-28 08:10:23 +09:00
config
kbuild: fix argument parsing in scripts/config
2025-03-15 21:22:42 +09:00
const_structs.checkpatch
const_structs.checkpatch: add ctl_table
2024-10-09 13:39:11 +02:00
decode_stacktrace.sh
scripts/decode_stacktrace.sh: fix decoding of lines with an additional info
2025-01-12 19:03:34 -08:00
decodecode
scripts/decodecode: add support for LoongArch
2023-12-29 12:22:25 -08:00
depmod.sh
kbuild: add $(objtree)/ prefix to some in-kernel build artifacts
2024-11-27 09:38:27 +09:00
dev-needs.sh
…
diffconfig
scripts: handle BrokenPipeError for python scripts
2023-01-26 12:43:33 +09:00
documentation-file-ref-check
scripts/documentation-file-ref-check: don't check perl/python scripts
2025-02-10 11:19:56 -07:00
extract_xc3028.pl
…
extract-fwblobs
scripts: add script to extract built-in firmware blobs
2025-03-16 22:30:46 -07:00
extract-ikconfig
scripts/extract-ikconfig: add zstd compression support
2022-08-29 13:58:47 +09:00
extract-module-sig.pl
…
extract-sys-certs.pl
…
extract-vmlinux
…
faddr2line
Revert "scripts/faddr2line: Check only two symbols when calculating symbol size"
2024-10-17 15:16:04 -07:00
file-size.sh
…
find-unused-docs.sh
…
gen_packed_field_checks.c
lib: packing: add pack_fields() and unpack_fields()
2024-12-11 20:13:00 -08:00
gen-crc-consts.py
riscv/crc: add "template" for Zbc optimized CRC functions
2025-03-10 09:29:08 -07:00
gen-randstruct-seed.sh
randstruct: Move seed generation into scripts/basic/
2022-05-08 01:33:07 -07:00
generate_builtin_ranges.awk
kbuild: exclude .rodata.(cst|str)* when building ranges
2025-03-15 21:22:52 +09:00
generate_initcall_order.pl
…
generate_rust_analyzer.py
scripts: generate_rust_analyzer: Add ffi crate
2025-04-08 19:47:06 +02:00
generate_rust_target.rs
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux
2025-04-03 12:21:44 -07:00
get_abi.py
scripts/get_abi.py: add support for undefined ABIs
2025-02-10 11:19:57 -07:00
get_dvb_firmware
…
get_feat.pl
scripts: get_feat.pl: substitute s390x with s390
2025-03-12 16:25:50 -06:00
get_maintainer.pl
get_maintainer: stop reporting subsystem status as maintainer role
2025-03-16 22:30:49 -07:00
gfp-translate
scripts: fix gfp-translate after ___GFP_*_BITS conversion to an enum
2024-09-01 17:59:01 -07:00
git.orderFile
scripts: Introduce a default git.orderFile
2023-12-29 22:25:20 +09:00
head-object-list.txt
openrisc: place exception table at the head of vmlinux
2024-12-10 12:04:19 +00:00
headerdep.pl
…
headers_install.sh
m68k: Avoid CONFIG_COLDFIRE switch in uapi header
2024-05-07 08:55:23 +10:00
insert-sys-cert.c
…
install.sh
kbuild: Create INSTALL_PATH directory if it does not exist
2024-07-20 13:34:54 +09:00
integer-wrap-ignore.scl
ubsan/overflow: Enable ignorelist parsing and add type filter
2025-03-07 19:58:05 -08:00
jobserver-exec
scripts: support GNU make 4.4 in jobserver-exec
2023-01-16 20:15:20 +09:00
kallsyms.c
kallsyms: Remove KALLSYMS_ABSOLUTE_PERCPU
2025-02-18 10:16:04 +01:00
Kbuild.include
kbuild: add $(objtree)/ prefix to some in-kernel build artifacts
2024-11-27 09:38:27 +09:00
Kconfig.include
kbuild: rust: add CONFIG_RUSTC_LLVM_VERSION
2024-10-13 22:22:28 +02:00
kernel-doc
scripts/kernel-doc: drop dead code for Wcontents_before_sections
2025-03-04 09:47:42 -07:00
ld-version.sh
kbuild: Make ld-version.sh more robust against version string changes
2024-07-15 03:13:32 +09:00
leaking_addresses.pl
leaking_addresses: Provide mechanism to scan binary files
2024-02-29 13:38:03 -08:00
Lindent
…
link-vmlinux.sh
Merge tag 'kbuild-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-04-05 15:46:50 -07:00
macro_checker.py
scripts: add macro_checker script to check unused parameters in macros
2024-09-01 20:43:28 -07:00
make_fit.py
scripts/make_fit: Print DT name before libfdt errors
2025-03-27 14:03:32 -05:00
Makefile
Merge tag 'kbuild-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-01-31 12:07:07 -08:00
Makefile.asm-headers
kbuild: fix rebuild of generic syscall headers
2024-07-18 10:01:55 -07:00
Makefile.autofdo
AutoFDO: Enable machine function split optimization for AutoFDO
2024-11-27 09:38:27 +09:00
Makefile.btf
kbuild, bpf: Correct pahole version that supports distilled base btf feature
2025-02-24 14:14:52 -08:00
Makefile.build
Merge tag 'kbuild-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-04-05 15:46:50 -07:00
Makefile.clang
kbuild: clang: Support building UM with SUBARCH=i386
2025-03-04 09:40:13 -08:00
Makefile.clean
kbuild: change working directory to external module directory with M=
2024-11-28 08:10:23 +09:00
Makefile.compiler
rust: kbuild: use pound to support GNU Make < 4.3
2025-04-15 20:45:46 +02:00
Makefile.debug
kbuild: rust: use -Zdebuginfo-compression
2024-04-02 17:41:22 +02:00
Makefile.defconf
kbuild: suppress stdout from merge_config for silent builds
2025-01-10 23:01:21 +09:00
Makefile.dtbinst
kbuild: Install dtb files as 0644 in Makefile.dtbinst
2024-06-26 00:18:57 +09:00
Makefile.dtbs
kbuild: move non-boot built-in DTBs to .rodata section
2024-09-30 20:42:52 +09:00
Makefile.extrawarn
kbuild: Switch from -Wvla to -Wvla-larger-than=1
2025-05-08 09:42:06 -07:00
Makefile.gcc-plugins
gcc-plugins: Remove ARM_SSP_PER_TASK plugin
2025-04-28 10:32:43 -07:00
Makefile.headersinst
…
Makefile.host
kbuild: support building external modules in a separate build directory
2024-11-28 08:11:55 +09:00
Makefile.kasan
kbuild: rust: Enable KASAN support
2024-09-16 18:04:37 +02:00
Makefile.kcov
…
Makefile.kcsan
kcsan: Ignore GCC 11+ warnings about TSan runtime support
2021-12-09 16:42:27 -08:00
Makefile.kmsan
kmsan: add KMSAN runtime core
2022-10-03 14:03:19 -07:00
Makefile.lib
Merge tag 'kbuild-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
2025-04-05 15:46:50 -07:00
Makefile.modfinal
kbuild: re-enable KCSAN for autogenerated *.mod.c intermediaries
2024-11-28 08:11:55 +09:00
Makefile.modinst
kbuild: Fix signing issue for external modules
2025-01-18 08:52:09 +09:00
Makefile.modpost
modpost: Allow extended modversions without basic MODVERSIONS
2025-01-11 02:36:32 +09:00
Makefile.package
kbuild: rpm-pkg: disable kernel-devel package when cross-compiling
2024-10-31 21:40:46 +09:00
Makefile.propeller
kbuild: Fix Propeller build option
2024-11-27 09:38:27 +09:00
Makefile.randstruct
randstruct: Enable Clang support
2022-05-08 01:33:07 -07:00
Makefile.ubsan
ubsan/overflow: Enable ignorelist parsing and add type filter
2025-03-07 19:58:05 -08:00
Makefile.userprogs
kbuild: support 'userldlibs' syntax
2023-11-01 23:26:01 +09:00
Makefile.vdsoinst
Merge tag 's390-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
2024-05-21 12:09:36 -07:00
Makefile.vmlinux
kbuild: Create intermediate vmlinux build with relocations preserved
2025-03-17 00:29:50 +09:00
Makefile.vmlinux_o
objtool: Remove --no-unreachable for noinstr-only vmlinux.o runs
2025-03-25 09:20:27 +01:00
makelst
…
markup_oops.pl
…
min-tool-version.sh
x86/build: Raise the minimum LLVM version to 15.0.0
2025-02-21 14:08:16 +01:00
misc-check
kbuild: make W=1 warn files that are tracked but ignored by git
2023-01-22 23:43:33 +09:00
mkcompile_h
Revert "kbuild: Make scripts/compile.h when sh != bash"
2022-09-29 04:40:15 +09:00
mksysmap
scripts/mksysmap: Fix escape chars '$'
2024-12-28 23:23:52 +09:00
mkuboot.sh
…
module-common.c
kbuild: compile constant module information only once
2024-09-07 17:24:08 +09:00
module.lds.S
kbuild: keep symbols for symbol_get() even with CONFIG_TRIM_UNUSED_KSYMS
2025-02-06 01:08:58 +09:00
modules-check.sh
kbuild: change module.order to list *.o instead of *.ko
2022-12-14 15:42:40 +09:00
nsdeps
scripts/nsdeps: get 'make nsdeps' working again
2024-12-03 08:22:25 -08:00
objdiff
kbuild: clean .tmp_* pattern by make clean
2022-06-05 06:20:57 +09:00
objdump-func
scripts/objdump-func: Support multiple functions
2023-04-14 16:08:28 +02:00
orc_hash.sh
x86/unwind/orc: Add ELF section with ORC version identifier
2023-06-16 17:17:42 +02:00
pahole-version.sh
kbuild: Add CONFIG_PAHOLE_VERSION
2022-02-02 11:19:33 +01:00
parse-maintainers.pl
…
patch-kernel
…
profile2linkerlist.pl
…
prune-kernel
scripts/prune-kernel: Use kernel-install if available
2022-05-11 21:46:38 +09:00
recordmcount.c
scripts: clean up IA-64 code
2023-12-03 18:51:48 +09:00
recordmcount.h
…
recordmcount.pl
riscv: remove MCOUNT_NAME workaround
2024-02-22 15:38:54 -08:00
relocs_check.sh
powerpc: Move script to check relocations at compile time in scripts/
2023-04-19 07:46:31 -07:00
remove-stale-files
selinux: move genheaders to security/selinux/
2024-10-03 16:07:51 -04:00
rust_is_available_bindgen_0_66.h
rust: warn about bindgen versions 0.66.0 and 0.66.1
2024-07-10 10:28:52 +02:00
rust_is_available_bindgen_libclang_concat.h
rust: warn on bindgen < 0.69.5 and libclang >= 19.1
2024-11-12 21:26:54 +01:00
rust_is_available_bindgen_libclang.h
scripts: add rust_is_available.sh
2022-09-28 09:02:06 +02:00
rust_is_available_test.py
rust: warn on bindgen < 0.69.5 and libclang >= 19.1
2024-11-12 21:26:54 +01:00
rust_is_available.sh
rust: document bindgen 0.71.0 regression
2025-01-10 00:17:00 +01:00
rustc-llvm-version.sh
kbuild: rust: avoid errors with old rustcs without LLVM patch version
2024-10-28 00:27:16 +01:00
rustc-version.sh
kbuild: rust: add CONFIG_RUSTC_VERSION
2024-09-05 22:44:18 +02:00
rustdoc_test_builder.rs
rust: support running Rust documentation tests as KUnit ones
2023-07-19 09:32:53 -06:00
rustdoc_test_gen.rs
Merge tag 'rust-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux
2025-03-30 17:03:26 -07:00
setlocalversion
setlocalversion: add -e option
2024-11-28 08:11:56 +09:00
show_delta
scripts: make python shebangs specific about desired version
2025-03-15 21:19:44 +09:00
sign-file.c
sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3
2024-09-20 19:52:48 +03:00
sorttable.c
scripts/sorttable: Fix endianness handling in build-time mcount sort
2025-04-02 09:51:26 -04:00
spdxcheck-test.sh
docs: move Linux logo into a new images folder
2022-06-01 09:32:45 -06:00
spdxcheck.py
scripts/spdxcheck: Handle license identifiers in Jinja comments
2025-01-08 15:38:33 +01:00
spdxexclude
scripts/spdxcheck: Exclude top-level README
2022-05-18 15:35:42 +02:00
spelling.txt
kernel-wide: add explicity||explicitly to spelling.txt
2025-01-12 20:21:06 -08:00
sphinx-pre-install
scripts: sphinx-pre-install: remove unnecessary double check for $cur_version
2024-09-05 14:32:36 -06:00
split-man.pl
…
ssl-common.h
sign-file,extract-cert: avoid using deprecated ERR_get_error_line()
2024-09-20 19:49:52 +03:00
stackdelta
…
stackusage
…
subarch.include
scripts: subarch.include: fix SUBARCH on macOS hosts
2024-09-10 13:56:37 +09:00
syscall.tbl
fs: add open_tree_attr()
2025-02-12 12:12:28 +01:00
syscallhdr.sh
…
syscallnr.sh
…
syscalltbl.sh
x86/syscall: Mark exit[_group] syscall handlers __noreturn
2024-06-28 15:23:38 +02:00
tags.sh
scripts/tags.sh: tag SYM_*START*() assembler symbols
2025-02-20 15:24:09 +01:00
tools-support-relr.sh
Makefile: use -z pack-relative-relocs
2023-04-17 11:23:06 +09:00
unifdef.c
scripts/unifdef: avoid constexpr keyword
2024-04-23 00:09:41 +09:00
ver_linux
…
verify_builtin_ranges.awk
scripts: add verifier script for builtin module range data
2024-09-20 09:21:52 +09:00
xen-hypercalls.sh
…
xz_wrap.sh
xz: adjust arch-specific options for better kernel compression
2024-09-01 20:43:27 -07:00