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Date: Tue, 8 Feb 2022 14:53:45 -0800 From: Kees Cook <keescook@...omium.org> To: Kees Cook <keescook@...omium.org> Cc: Nathan Chancellor <nathan@...nel.org>, llvm@...ts.linux.dev, Miguel Ojeda <ojeda@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, George Burgess IV <gbiv@...gle.com>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH v7 3/8] Compiler Attributes: Add __overloadable for Clang In order for FORTIFY_SOURCE to use __pass_object_size on an "extern inline" function, as all the fortified string functions are, the functions must be marked as being overloadable (i.e. different prototypes due to the implicitly injected object size arguments). This allows the __pass_object_size versions to take precedence. Cc: Nathan Chancellor <nathan@...nel.org> Cc: llvm@...ts.linux.dev Reviewed-by: Miguel Ojeda <ojeda@...nel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com> Signed-off-by: Kees Cook <keescook@...omium.org> --- include/linux/compiler_attributes.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/linux/compiler_attributes.h b/include/linux/compiler_attributes.h index d0c503772061..dcaf55f5d1ae 100644 --- a/include/linux/compiler_attributes.h +++ b/include/linux/compiler_attributes.h @@ -257,6 +257,18 @@ */ #define __noreturn __attribute__((__noreturn__)) +/* + * Optional: not supported by gcc. + * Optional: not supported by icc. + * + * clang: https://clang.llvm.org/docs/AttributeReference.html#overloadable + */ +#if __has_attribute(__overloadable__) +# define __overloadable __attribute__((__overloadable__)) +#else +# define __overloadable +#endif + /* * gcc: https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-packed-type-attribute * clang: https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-packed-variable-attribute -- 2.30.2
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