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Compiler Attributes: Add __overloadable for Clang

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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@kernel.org>
Cc: llvm@lists.linux.dev
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220208225350.1331628-4-keescook@chromium.org
This commit is contained in:
Kees Cook 2022-02-08 14:53:45 -08:00
parent f0202b8ca4
commit d694dbaefd
1 changed files with 12 additions and 0 deletions
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12
include/linux/compiler_attributes.h
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@ -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