linux-kernel - RE: [PATCH v15 01/26] Documentation/x86: Add CET description

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Message-Id: <20201130182641.29812-1-ndesaulniers@google.com>
Date:   Mon, 30 Nov 2020 10:26:41 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     yu-cheng.yu@...el.com
Cc:     Dave.Martin@....com, arnd@...db.de, bp@...en8.de,
        bsingharora@...il.com, corbet@....net, dave.hansen@...ux.intel.com,
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Subject: RE: [PATCH v15 01/26] Documentation/x86: Add CET description

(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).

> 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.