diff options
| author | Bill Wendling <morbo@google.com> | 2026-01-16 00:57:57 +0000 |
|---|---|---|
| committer | Kees Cook <kees@kernel.org> | 2026-01-17 11:00:28 -0800 |
| commit | 150a04d817d8f5be5a4f92799827cdc8d7e45989 (patch) | |
| tree | 2551fa6089849d2f48cd9fc99563c7237e9c2d67 /init/Kconfig | |
| parent | 9f54ab83cb2a17071be70a80b94db6c36e597696 (diff) | |
| download | lwn-150a04d817d8f5be5a4f92799827cdc8d7e45989.tar.gz lwn-150a04d817d8f5be5a4f92799827cdc8d7e45989.zip | |
compiler_types.h: Attributes: Add __counted_by_ptr macro
Introduce __counted_by_ptr(), which works like __counted_by(), but for
pointer struct members.
struct foo {
int a, b, c;
char *buffer __counted_by_ptr(bytes);
short nr_bars;
struct bar *bars __counted_by_ptr(nr_bars);
size_t bytes;
};
Because "counted_by" can only be applied to pointer members in very
recent compiler versions, its application ends up needing to be distinct
from flexibe array "counted_by" annotations, hence a separate macro.
This is a reworking of Kees' previous patch [1].
Link: https://lore.kernel.org/all/20251020220118.1226740-1-kees@kernel.org/ [1]
Co-developed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Bill Wendling <morbo@google.com>
Link: https://patch.msgid.link/20260116005838.2419118-1-morbo@google.com
Signed-off-by: Kees Cook <kees@kernel.org>
Diffstat (limited to 'init/Kconfig')
| -rw-r--r-- | init/Kconfig | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index fa79feb8fe57..96b7cd481eaa 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -143,6 +143,13 @@ config CC_HAS_COUNTED_BY # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896 default y if CC_IS_GCC && GCC_VERSION >= 150100 +config CC_HAS_COUNTED_BY_PTR + bool + # supported since clang 22 + default y if CC_IS_CLANG && CLANG_VERSION >= 220000 + # supported since gcc 16.0.0 + default y if CC_IS_GCC && GCC_VERSION >= 160000 + config CC_HAS_MULTIDIMENSIONAL_NONSTRING def_bool $(success,echo 'char tag[][4] __attribute__((__nonstring__)) = { };' | $(CC) $(CLANG_FLAGS) -x c - -c -o /dev/null -Werror) |