From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yu-cheng Yu Subject: Re: [RFC PATCH v4 18/27] x86/cet/shstk: User-mode shadow stack support Date: Wed, 03 Oct 2018 08:12:29 -0700 Message-ID: References: <20180921150351.20898-1-yu-cheng.yu@intel.com> <20180921150351.20898-19-yu-cheng.yu@intel.com> <20181003150754.GC32759@asgard.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20181003150754.GC32759@asgard.redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Eugene Syromiatnikov Cc: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek Peter List-Id: linux-api@vger.kernel.org On Wed, 2018-10-03 at 17:08 +0200, Eugene Syromiatnikov wrote: > On Fri, Sep 21, 2018 at 08:03:42AM -0700, Yu-cheng Yu wrote: > > > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c > > index 5ea1d64cb0b4..b20450dde5b7 100644 > > --- a/fs/proc/task_mmu.c > > +++ b/fs/proc/task_mmu.c > > @@ -652,6 +652,9 @@ static void show_smap_vma_flags(struct seq_file *m, > > struct vm_area_struct *vma) > > [ilog2(VM_PKEY_BIT4)] = "", > > #endif > > #endif /* CONFIG_ARCH_HAS_PKEYS */ > > +#ifdef CONFIG_X86_INTEL_SHADOW_STACK_USER > > + [ilog2(VM_SHSTK)] = "ss" > > +#endif > > It's probably makes sense to have this hunk as a part of "x86/cet/shstk: > Add Kconfig option for user-mode shadow stack", where VM_SHSTK was > initially introduced. Yes, move it to "mm/Introduce VM_SHSTK for shadow stack memory". Yu-cheng