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Date: Tue, 25 Aug 2020 08:08:45 -0700 From: "Yu, Yu-cheng" <yu-cheng.yu@...el.com> To: Florian Weimer <fweimer@...hat.com>, Andy Lutomirski <luto@...nel.org> Cc: X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, LKML <linux-kernel@...r.kernel.org>, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>, linux-arch <linux-arch@...r.kernel.org>, Linux API <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>, "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>, Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>, Dave Martin <Dave.Martin@....com>, Weijiang Yang <weijiang.yang@...el.com> Subject: Re: [PATCH v11 9/9] x86: Disallow vsyscall emulation when CET is enabled On 8/25/2020 2:14 AM, Florian Weimer wrote: > * Andy Lutomirski: > >> On Mon, Aug 24, 2020 at 5:30 PM Yu-cheng Yu <yu-cheng.yu@...el.com> wrote: >>> >>> From: "H.J. Lu" <hjl.tools@...il.com> >>> >>> Emulation of the legacy vsyscall page is required by some programs built >>> before 2013. Newer programs after 2013 don't use it. Disallow vsyscall >>> emulation when Control-flow Enforcement (CET) is enabled to enhance >>> security. >> >> NAK. >> >> By all means disable execute emulation if CET-IBT is enabled at the >> time emulation is attempted, and maybe even disable the vsyscall page >> entirely if you can magically tell that CET-IBT will be enabled when a >> process starts, but you don't get to just disable it outright on a >> CET-enabled kernel. > > Yeah, we definitely would have to revert/avoid this downstream. People > definitely want to run glibc-2.12-era workloads on current kernels. > Thanks for catching it. > That makes sense. I will update the patch. Thanks, Yu-cheng
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