Messages in this thread Patch in this message | | | From | Kees Cook <> | Subject | [PATCH v6 2/4] Compiler Attributes: Add __overloadable for Clang | Date | Thu, 3 Feb 2022 09:33:05 -0800 |
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In order for FORTIFY_SOURCE to use __pass_object_size on an "inline extern" function, as all the fortified string functions are, the functions must be marked as being overloadable (i.e. different prototypes). This allows the __pass_object_size versions to take precedence.
Cc: Miguel Ojeda <ojeda@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Nathan Chancellor <nathan@kernel.org> Cc: llvm@lists.linux.dev Signed-off-by: Kees Cook <keescook@chromium.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 4ce370094e3a..dc3bf2a6e1c9 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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