[lkml]   [2022]   [May]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH 00/21] KCFI support
On Sat, Apr 30, 2022 at 9:08 AM Kenton Groombridge <> wrote:
> Many thanks for continuing to work on this! As a user who has been
> following the evolution of this patch series for a while now, I have a
> couple of burning questions:
> 1) The LLVM patch says that kCFI is not compatible with execute-only
> memory. Is there a plan ahead for kCFI if and when execute-only memory
> is implemented?

There's no plan for executable-only memory right now, that would
require type hashes to be moved somewhere else to read-only memory.

> 2) kCFI only checks indirect calls while Clang's traditional CFI has
> more schemes like bad cast checking and so on. Are there any major
> security tradeoffs as a result of this?

No, cfi-icall is only scheme that's relevant for the kernel. The other
schemes implemented in Clang are mostly useful for C++.


 \ /
  Last update: 2022-05-02 17:33    [W:0.265 / U:0.920 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site