Messages in this thread | | | Subject | Re: [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32 | From | Andy Lutomirski <> | Date | Mon, 9 Aug 2021 16:04:18 -0700 |
| |
On 7/22/21 1:57 PM, Yu-cheng Yu wrote: > In a signal, a task's IBT status needs to be saved to the signal frame, and > later restored in sigreturn. For the purpose, previous versions of the > series add a new struct to the signal frame. However, a new signal frame > format (or re-using a reserved space) introduces complex compatibility > issues. > > In the discussion (see link below), Andy Lutomirski proposed using a > ucontext flag. The approach is clean and eliminates most compatibility > issues. > > However, a legacy IA32 signal frame does not have ucontext and cannot > support a uc flag. Thus, > > - Disable IBT for ia32. > - In ia32 sigreturn, verify ibt is disabled.
Acked-by: Andy Lutomirski <luto@kernel.org>
| |