Messages in this thread | | | Subject | Re: [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32 | From | "Yu, Yu-cheng" <> | Date | Tue, 10 Aug 2021 09:07:49 -0700 |
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On 8/9/2021 4:04 PM, Andy Lutomirski wrote: > 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> >
Thanks!
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