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Date: Sat, 23 Jul 2022 13:21:33 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Sami Tolvanen <samitolvanen@...gle.com> Cc: linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>, Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Joao Moreira <joao@...rdrivepizza.com>, Sedat Dilek <sedat.dilek@...il.com>, Steven Rostedt <rostedt@...dmis.org>, linux-hardening@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev Subject: Re: [RFC PATCH v3 20/20] x86: Add support for CONFIG_CFI_CLANG On Fri, Jun 10, 2022 at 04:35:13PM -0700, Sami Tolvanen wrote: > +#ifdef CONFIG_CFI_CLANG > +#define __CFI_TYPE(name) \ > + .fill 7, 1, 0xCC ASM_NL \ > + SYM_START(__cfi_##name, SYM_L_LOCAL, SYM_A_NONE) \ > + int3 ASM_NL \ > + int3 ASM_NL \ > + mov __kcfi_typeid_##name, %eax ASM_NL \ > + int3 ASM_NL \ > + int3 ASM_NL \ > + SYM_FUNC_END(__cfi_##name) > +#endif Like said on IRC yesterday, this doesn't generate the right mov encoding. .byte 0xb8 ; .long __kcfi_typeid_##name ; \ works. Your LLVM tree already has the ZExt patch you gave me yesterday to fix up the linker fallout from this change.
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