Re: [PATCH v23 00/28] Control-flow Enforcement: Shadow Stack

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On 3/16/2021 2:15 PM, Peter Zijlstra wrote:
On Tue, Mar 16, 2021 at 08:10:26AM -0700, Yu-cheng Yu wrote:
Control-flow Enforcement (CET) is a new Intel processor feature that blocks
return/jump-oriented programming attacks.  Details are in "Intel 64 and
IA-32 Architectures Software Developer's Manual" [1].

CET can protect applications and the kernel.  This series enables only
application-level protection, and has three parts:

   - Shadow stack [2],
   - Indirect branch tracking [3], and
   - Selftests [4].

CET is marketing; afaict SS and IBT are 100% independent and there's no
reason what so ever to have them share any code, let alone a Kconfig
knob.
> In fact, I think all of this would improve is you remove the CET name
from all of this entirely. Put this series under CONFIG_X86_SHSTK (or
_SS) and use CONFIG_X86_IBT for the other one.

Similarly with the .c file.

All this CET business is just pure confusion.


What about this, we bring back CONFIG_X86_SHSTK and CONFIG_X86_IBT.
For the CET name itself, can we change it to CFE (Control Flow Enforcement), or just CF?

In signal handling, ELF header parsing and arch_prctl(), shadow stack and IBT pretty much share the same code. It is better not to split them into two sets of files.

Thanks,
Yu-cheng



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