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SubjectRe: [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32
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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>

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