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Date: Wed, 1 Nov 2017 14:52:48 -0700 From: Dave Hansen <dave.hansen@...ux.intel.com> To: Thomas Gleixner <tglx@...utronix.de>, Andy Lutomirski <luto@...nel.org> Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, moritz.lipp@...k.tugraz.at, Daniel Gruss <daniel.gruss@...k.tugraz.at>, michael.schwarz@...k.tugraz.at, Linus Torvalds <torvalds@...ux-foundation.org>, Kees Cook <keescook@...gle.com>, Hugh Dickins <hughd@...gle.com>, X86 ML <x86@...nel.org> Subject: Re: [PATCH 02/23] x86, kaiser: do not set _PAGE_USER for init_mm page tables On 11/01/2017 02:28 PM, Thomas Gleixner wrote: > On Wed, 1 Nov 2017, Andy Lutomirski wrote: >> The vsyscall page is _PAGE_USER and lives in init_mm via the fixmap. > > Groan, forgot about that abomination, but still there is no point in having > it marked PAGE_USER in the init_mm at all, kaiser or not. So shouldn't this patch effectively make the vsyscall page unusable? Any idea why that didn't show up in any of the x86 selftests?
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