From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Borislav Petkov <bpetkov@suse.de>,
Greg KH <gregkh@linuxfoundation.org>,
Kees Cook <keescook@google.com>, Hugh Dickins <hughd@google.com>,
Brian Gerst <brgerst@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
David Laight <David.Laight@aculab.com>,
Eduardo Valentin <eduval@amazon.com>,
aliguori@amazon.com, Will Deacon <will.deacon@arm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [patch 11/16] x86/ldt: Force access bit for CS/SS
Date: Tue, 12 Dec 2017 20:04:10 +0100 [thread overview]
Message-ID: <20171212190410.yhgc7xplx4hwem2n@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.20.1712121940230.2289@nanos>
On Tue, Dec 12, 2017 at 07:41:39PM +0100, Thomas Gleixner wrote:
> The pages are populated _before_ the new ldt is installed. So no memory
> pressure issue, nothing. If the populate fails, then modify_ldt() returns
> with an error.
Also, these pages are not visible to reclaim. They're not pagecache and
we didn't install a shrinker.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Andy Lutomirski <luto@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, X86 ML <x86@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Borislav Petkov <bpetkov@suse.de>,
Greg KH <gregkh@linuxfoundation.org>,
Kees Cook <keescook@google.com>, Hugh Dickins <hughd@google.com>,
Brian Gerst <brgerst@gmail.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Denys Vlasenko <dvlasenk@redhat.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>,
David Laight <David.Laight@aculab.com>,
Eduardo Valentin <eduval@amazon.com>,
aliguori@amazon.com, Will Deacon <will.deacon@arm.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [patch 11/16] x86/ldt: Force access bit for CS/SS
Date: Tue, 12 Dec 2017 20:04:10 +0100 [thread overview]
Message-ID: <20171212190410.yhgc7xplx4hwem2n@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.20.1712121940230.2289@nanos>
On Tue, Dec 12, 2017 at 07:41:39PM +0100, Thomas Gleixner wrote:
> The pages are populated _before_ the new ldt is installed. So no memory
> pressure issue, nothing. If the populate fails, then modify_ldt() returns
> with an error.
Also, these pages are not visible to reclaim. They're not pagecache and
we didn't install a shrinker.
--
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next prev parent reply other threads:[~2017-12-12 19:04 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-12 17:32 [patch 00/16] x86/ldt: Use a VMA based read only mapping Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 01/16] arch: Allow arch_dup_mmap() to fail Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 02/16] x86/ldt: Rework locking Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 03/16] x86/ldt: Prevent ldt inheritance on exec Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 04/16] mm/softdirty: Move VM_SOFTDIRTY into high bits Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 05/16] mm: Allow special mappings with user access cleared Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 18:00 ` Andy Lutomirski
2017-12-12 18:00 ` Andy Lutomirski
2017-12-12 18:05 ` Peter Zijlstra
2017-12-12 18:05 ` Peter Zijlstra
2017-12-12 18:06 ` Andy Lutomirski
2017-12-12 18:06 ` Andy Lutomirski
2017-12-12 18:25 ` Peter Zijlstra
2017-12-12 18:25 ` Peter Zijlstra
2017-12-13 12:22 ` Peter Zijlstra
2017-12-13 12:22 ` Peter Zijlstra
2017-12-13 12:57 ` Kirill A. Shutemov
2017-12-13 12:57 ` Kirill A. Shutemov
2017-12-13 14:34 ` Peter Zijlstra
2017-12-13 14:34 ` Peter Zijlstra
2017-12-13 14:43 ` Kirill A. Shutemov
2017-12-13 14:43 ` Kirill A. Shutemov
2017-12-13 15:00 ` Peter Zijlstra
2017-12-13 15:00 ` Peter Zijlstra
2017-12-13 15:04 ` Peter Zijlstra
2017-12-13 15:04 ` Peter Zijlstra
2017-12-13 15:14 ` Dave Hansen
2017-12-13 15:14 ` Dave Hansen
2017-12-13 15:32 ` Peter Zijlstra
2017-12-13 15:32 ` Peter Zijlstra
2017-12-13 15:47 ` Dave Hansen
2017-12-13 15:47 ` Dave Hansen
2017-12-13 15:54 ` Peter Zijlstra
2017-12-13 15:54 ` Peter Zijlstra
2017-12-13 18:08 ` Linus Torvalds
2017-12-13 18:08 ` Linus Torvalds
2017-12-13 18:21 ` Dave Hansen
2017-12-13 18:21 ` Dave Hansen
2017-12-13 18:23 ` Linus Torvalds
2017-12-13 18:23 ` Linus Torvalds
2017-12-13 18:31 ` Andy Lutomirski
2017-12-13 18:31 ` Andy Lutomirski
2017-12-13 18:32 ` Peter Zijlstra
2017-12-13 18:32 ` Peter Zijlstra
2017-12-13 18:35 ` Linus Torvalds
2017-12-13 18:35 ` Linus Torvalds
2017-12-14 4:53 ` Aneesh Kumar K.V
2017-12-14 4:53 ` Aneesh Kumar K.V
2017-12-13 21:50 ` Matthew Wilcox
2017-12-13 21:50 ` Matthew Wilcox
2017-12-13 22:12 ` Peter Zijlstra
2017-12-13 22:12 ` Peter Zijlstra
2017-12-14 0:10 ` Matthew Wilcox
2017-12-14 0:10 ` Matthew Wilcox
2017-12-14 0:16 ` Andy Lutomirski
2017-12-14 0:16 ` Andy Lutomirski
2017-12-12 17:32 ` [patch 06/16] mm: Provide vm_special_mapping::close Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 07/16] selftest/x86: Implement additional LDT selftests Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 08/16] selftests/x86/ldt_gdt: Prepare for access bit forced Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 09/16] mm: Make populate_vma_page_range() available Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 10/16] x86/ldt: Do not install LDT for kernel threads Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:57 ` Andy Lutomirski
2017-12-12 17:57 ` Andy Lutomirski
2017-12-12 17:32 ` [patch 11/16] x86/ldt: Force access bit for CS/SS Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 18:03 ` Andy Lutomirski
2017-12-12 18:03 ` Andy Lutomirski
2017-12-12 18:09 ` Peter Zijlstra
2017-12-12 18:09 ` Peter Zijlstra
2017-12-12 18:10 ` Andy Lutomirski
2017-12-12 18:10 ` Andy Lutomirski
2017-12-12 18:22 ` Andy Lutomirski
2017-12-12 18:22 ` Andy Lutomirski
2017-12-12 18:29 ` Peter Zijlstra
2017-12-12 18:29 ` Peter Zijlstra
2017-12-12 18:41 ` Thomas Gleixner
2017-12-12 18:41 ` Thomas Gleixner
2017-12-12 19:04 ` Peter Zijlstra [this message]
2017-12-12 19:04 ` Peter Zijlstra
2017-12-12 19:05 ` Linus Torvalds
2017-12-12 19:05 ` Linus Torvalds
2017-12-12 19:26 ` Andy Lutomirski
2017-12-12 19:26 ` Andy Lutomirski
2017-12-19 12:10 ` David Laight
2017-12-19 12:10 ` David Laight
2017-12-12 17:32 ` [patch 12/16] x86/ldt: Reshuffle code Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 13/16] x86/ldt: Introduce LDT write fault handler Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:58 ` Andy Lutomirski
2017-12-12 17:58 ` Andy Lutomirski
2017-12-12 18:19 ` Peter Zijlstra
2017-12-12 18:19 ` Peter Zijlstra
2017-12-12 18:43 ` Thomas Gleixner
2017-12-12 18:43 ` Thomas Gleixner
2017-12-12 19:01 ` Linus Torvalds
2017-12-12 19:01 ` Linus Torvalds
2017-12-12 19:21 ` Thomas Gleixner
2017-12-12 19:21 ` Thomas Gleixner
2017-12-12 19:51 ` Linus Torvalds
2017-12-12 19:51 ` Linus Torvalds
2017-12-12 20:21 ` Dave Hansen
2017-12-12 20:21 ` Dave Hansen
2017-12-12 20:37 ` Thomas Gleixner
2017-12-12 20:37 ` Thomas Gleixner
2017-12-12 21:35 ` Andy Lutomirski
2017-12-12 21:35 ` Andy Lutomirski
2017-12-12 21:42 ` Thomas Gleixner
2017-12-12 21:42 ` Thomas Gleixner
2017-12-12 21:41 ` Thomas Gleixner
2017-12-12 21:41 ` Thomas Gleixner
2017-12-12 21:46 ` Thomas Gleixner
2017-12-12 21:46 ` Thomas Gleixner
2017-12-12 22:25 ` Peter Zijlstra
2017-12-12 22:25 ` Peter Zijlstra
2017-12-12 17:32 ` [patch 14/16] x86/ldt: Prepare for VMA mapping Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 15/16] x86/ldt: Add VMA management code Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 17:32 ` [patch 16/16] x86/ldt: Make it read only VMA mapped Thomas Gleixner
2017-12-12 17:32 ` Thomas Gleixner
2017-12-12 18:03 ` [patch 00/16] x86/ldt: Use a VMA based read only mapping Andy Lutomirski
2017-12-12 18:03 ` Andy Lutomirski
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