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fortify: Work around Clang inlining bugs
To enable FORTIFY_SOURCE support for Clang, the kernel must work around a pair of bugs, related to Clang's inlining. Change all the fortified APIs into macros with different inline names to bypass Clang's broken inline-of-a-builtin detection: https://bugs.llvm.org/show_bug.cgi?id=50322 Lift all misbehaving __builtin_object_size() calls into the macros to bypass Clang's broken __builtin_object_size() arguments-of-an-inline visibility: ClangBuiltLinux#1401 Thankfully, due to how the inlining already behaves in GCC, this change has no effect on GCC builds, but allows Clang to finally gain full FORTIFY coverage. However, because of a third bug which had no work-arounds, FORTIFY_SOURCE will only work with Clang version 13 and later. Update the Kconfig to reflect the new requirements. Clang 14 introduced compiletime_assert() support, so also adjust the compile-time warning test to catch Clang's variant of the warning text. Signed-off-by: Kees Cook <keescook@chromium.org>
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