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Date: Tue, 18 Oct 2022 14:26:07 +0100 From: Mark Rutland <mark.rutland@....com> To: Peter Zijlstra <peterz@...radead.org> Cc: Steven Rostedt <rostedt@...dmis.org>, x86@...nel.org, linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>, Sami Tolvanen <samitolvanen@...gle.com> Subject: Re: [PATCH] ftrace,kcfi: Separate ftrace_stub() and ftrace_stub_graph() On Tue, Oct 18, 2022 at 03:18:46PM +0200, Peter Zijlstra wrote: > On Tue, Oct 18, 2022 at 02:35:16PM +0200, Peter Zijlstra wrote: > > --- a/include/asm-generic/vmlinux.lds.h > > +++ b/include/asm-generic/vmlinux.lds.h > > @@ -162,6 +162,16 @@ > > #define PATCHABLE_DISCARDS *(__patchable_function_entries) > > #endif > > > > +#ifndef ARCH_SUPPORTS_CFI_CLANG > > #ifndef CONFIG_ARCH_.. > > works much better as we found. > > > +/* > > + * Simply points to ftrace_stub, but with the proper protocol. > > + * Defined by the linker script in linux/vmlinux.lds.h > > + */ > > +#define FTRACE_STUB_HACK ftrace_stub_graph = ftrace_stub; > > +#else > > +#define FTRACE_STUB_HACK > > +#endif > > Fixed up version available at: > > git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/urgent Thanks for this! I've just tested that branch, (HEAD commit 586edc9c16e747ce). With kCFI enabled I can run the ftrace boot tests and ftrace selftests without issues. FWIW: Reviewed-by: Mark Rutland <mark.rutland@....com> Tested-by: Mark Rutland <mark.rutland@....com> Mark.
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