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Date: Sat, 26 Feb 2022 02:27:53 +0100 From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com> To: Kees Cook <keescook@...omium.org> Cc: Dan Li <ashimida@...ux.alibaba.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Masahiro Yamada <masahiroy@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, Mark Rutland <mark.rutland@....com>, Sami Tolvanen <samitolvanen@...gle.com>, Nicholas Piggin <npiggin@...il.com>, Guenter Roeck <linux@...ck-us.net>, Masami Hiramatsu <mhiramat@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, Luc Van Oostenryck <luc.vanoostenryck@...il.com>, Marco Elver <elver@...gle.com>, linux-kernel <linux-kernel@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, llvm@...ts.linux.dev, linux-hardening@...r.kernel.org Subject: Re: [PATCH] [PATCH v2] AARCH64: Add gcc Shadow Call Stack support On Fri, Feb 25, 2022 at 9:59 PM Kees Cook <keescook@...omium.org> wrote: > > I thought about that too, but I think it's less simple due to the > __has_feature vs CONFIG differences, etc: > https://lore.kernel.org/lkml/202202251243.1E38256F9@keescook/ > > But maybe __has_feature doesn't really matter here? I have not tested it, but I was assuming the `CONFIG` could do its job, since it comes from testing the compiler flag. If the `__has_feature` is actually restricting it more than that, then we should probably get the `CONFIG` fixed so that it only gets enabled when really it is going to be used. Cheers, Miguel
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