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hardening: Require clang 20.1.0 for __counted_by 

After an innocuous change in -next that modified a structure that
contains __counted_by, clang-19 start crashing when building certain
files in drivers/gpu/drm/xe. When assertions are enabled, the more
descriptive failure is:

  clang: clang/lib/AST/RecordLayoutBuilder.cpp:3335: const ASTRecordLayout &clang::ASTContext::getASTRecordLayout(const RecordDecl *) const: Assertion `D && "Cannot get layout of forward declarations!"' failed.

According to a reverse bisect, a tangential change to the LLVM IR
generation phase of clang during the LLVM 20 development cycle [1]
resolves this problem. Bump the version of clang that enables
CONFIG_CC_HAS_COUNTED_BY to 20.1.0 to ensure that this issue cannot be
hit.

Link: 160fb1121c [1]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20250807-fix-counted_by-clang-19-v1-1-902c86c1d515@kernel.org
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Nathan Chancellor 2025-08-07 14:36:28 -07:00 committed by Kees Cook
parent f05995cc6d
commit 86a9b12506
1 changed files with 5 additions and 4 deletions
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9
init/Kconfig
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@ -117,10 +117,11 @@ config CC_HAS_NO_PROFILE_FN_ATTR
config CC_HAS_COUNTED_BY
bool
# clang needs to be at least 19.1.3 to avoid __bdos miscalculations
# https://github.com/llvm/llvm-project/pull/110497
# https://github.com/llvm/llvm-project/pull/112636
default y if CC_IS_CLANG && CLANG_VERSION >= 190103
# clang needs to be at least 20.1.0 to avoid potential crashes
# when building structures that contain __counted_by
# https://github.com/ClangBuiltLinux/linux/issues/2114
# https://github.com/llvm/llvm-project/commit/160fb1121cdf703c3ef5e61fb26c5659eb581489
default y if CC_IS_CLANG && CLANG_VERSION >= 200100
# supported since gcc 15.1.0
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896
default y if CC_IS_GCC && GCC_VERSION >= 150100