Date: Tue, 29 Oct 2019 13:35:40 -0700 From: Nick Desaulniers <ndesaulniers@...gle.com> To: Mark Rutland <mark.rutland@....com>, Kristof Beyls <Kristof.Beyls@....com> Cc: Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu <mhiramat@...nel.org>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Dave Martin <Dave.Martin@....com>, Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>, Jann Horn <jannh@...gle.com>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, clang-built-linux <clang-built-linux@...glegroups.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, LKML <linux-kernel@...r.kernel.org>, Sami Tolvanen <samitolvanen@...gle.com> Subject: Re: [PATCH v2 09/17] arm64: disable function graph tracing with SCS On Tue, Oct 29, 2019 at 10:45 AM Sami Tolvanen <samitolvanen@...gle.com> wrote: > > On Fri, Oct 25, 2019 at 4:03 AM Mark Rutland <mark.rutland@....com> wrote: > > We have a similar issue with pointer authentication, and we're solving > > that with -fpatchable-function-entry, which allows us to hook the > > callsite before it does anything with the return address. IIUC we could > > use the same mechanism here (and avoid introducing a third). > > > > Are there plans to implement -fpatchable-function-entry on the clang > > side? > > I'm not sure if there are plans at the moment, but if this feature is > needed for PAC, adding it to clang shouldn't be a problem. Nick, did > you have any thoughts on this? I didn't see anything explicitly in LLVM's issue tracker. I also didn't see -fpatchable-function-entry currently in -next other than under arch/parisc. Are there patches I can look at? Has ARM's kernel team expressed the need to ARM's LLVM team? -- Thanks, ~Nick Desaulniers
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