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Date: Mon, 9 Aug 2021 16:04:18 -0700 From: Andy Lutomirski <luto@...nel.org> To: Yu-cheng Yu <yu-cheng.yu@...el.com>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org, linux-arch@...r.kernel.org, linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Balbir Singh <bsingharora@...il.com>, Borislav Petkov <bp@...en8.de>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Eugene Syromiatnikov <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Kees Cook <keescook@...omium.org>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com>, Pengfei Xu <pengfei.xu@...el.com>, Haitao Huang <haitao.huang@...el.com>, Rick P Edgecombe <rick.p.edgecombe@...el.com> Subject: Re: [PATCH v28 04/10] x86/cet/ibt: Disable IBT for ia32 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@...nel.org>
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