Messages in this thread | | | Subject | Re: [PATCH v15 01/26] Documentation/x86: Add CET description | From | "Yu, Yu-cheng" <> | Date | Mon, 30 Nov 2020 11:47:31 -0800 |
| |
On 11/30/2020 11:38 AM, Fāng-ruì Sòng wrote: > On Mon, Nov 30, 2020 at 10:34 AM Yu, Yu-cheng <yu-cheng.yu@intel.com> wrote: >> >> On 11/30/2020 10:26 AM, Nick Desaulniers wrote: >>> (In response to https://lore.kernel.org/lkml/20201110162211.9207-2-yu-cheng.yu@intel.com/) >>> >>>> These need to be enabled to build a CET-enabled kernel, and Binutils v2.31 >>>> and GCC v8.1 or later are required to build a CET kernel. >>> >>> What about LLVM? Surely CrOS might be of interest to ship this on (we ship the >>> equivalent for aarch64 on Android). >>> >> >> I have not built with LLVM, but think it probably will work as well. I >> will test it. >> >>>> An application's CET capability is marked in its ELF header and can be >>>> verified from the following command output, in the NT_GNU_PROPERTY_TYPE_0 >>>> field: >>>> >>>> readelf -n <application> | grep SHSTK >>>> properties: x86 feature: IBT, SHSTK >>> >>> Same for llvm-readelf. >>> >> >> I will add that to the document. >> >> Thanks, >> Yu-cheng > > The baseline LLVM version is 10.0.1, which is good enough for clang > -fcf-protection=full, llvm-readelf -n, LLD's .note.gnu.property > handling (the LLD option is `-z force-ibt`, though) > >
Thanks!
Yu-cheng
| |