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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
	Andy Lutomirsky <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@intel.com>,
	Borislav Petkov <bpetkov@suse.de>,
	Greg KH <gregkh@linuxfoundation.org>,
	keescook@google.com, hughd@google.com,
	Brian Gerst <brgerst@gmail.com>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Denys Vlasenko <dvlasenk@redhat.com>,
	Rik van Riel <riel@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>,
	daniel.gruss@iaik.tugraz.at
Subject: [patch 00/60] x86/kpti: Kernel Page Table Isolation (was KAISER)
Date: Mon, 04 Dec 2017 15:07:06 +0100
Message-ID: <20171204140706.296109558@linutronix.de> (raw)

This series is a major overhaul of the KAISER patches:

1) Entry code

   Mostly the same, except for a handful of fixlets and delta
   improvements folded into the corresponding patches

   New: Map TSS read only into the user space visible mapping

     This is 64bit only, as 32bit needs the TSS mapped RW

     AMD confirmed that there is no issue with that. It would be nice to
     get confirmation from Intel as well.

2) Namespace

   Several people including Linus requested to change the KAISER name.

   We came up with a list of technically correct acronyms:

     User Address Space Separation, prefix uass_

     Forcefully Unmap Complete Kernel With Interrupt Trampolines, prefix fuckwit_

   but we are politically correct people so we settled for

    Kernel Page Table Isolation, prefix kpti_

   Linus, your call :)

3) The actual isolation patches

   - Replaced the magic kaiser_add/remove_mapping() code by mapping everything
     which needs to be shared with user space into the fixmap

   - PMD aligned the shared fixmap so the PTE page can be shared between
     user and kernel space page tables

   - Integrated all fixes and Peters rewrite of the PCID/TLB flush code.

   - Restructured the patch set in a way that it is simpler to review

   - Got rid of the strange wording of shadow page tables, because they are
     not shadowish at all. KASAN, virt etc. use shadows, but these tables
     are actively in use and integral part of the functionality

   - Moved the debugfs files into a new directory so they don't clutter the
     debugfs root directory.

LIMITATIONS:

   - allmod/yes config builds fail right now because the fixmap grows
     too large and breaks the EFI assumptions. This is still investigated.

     A possible solution is just to use one of the address space holes
     and grab a separate pgdir to map the cpu entry area. Not hard to do
     and it wont change much of the principle of these patches.

TODOs:

   - This needs a thorough review again. Sorry.

   - Please verify that all fixlets have been integrated. The mail threads
     are horribly scattered so I might have missed something.

   - Rewrite documentation. I dropped the documentation patch as it not
     longer applies.

   - Handle native vsyscalls. Right now the patch set supports only
     emulation, but it should be possible to support native as well.
     Nothing urgent, I'd rather prefer to kill them completely.

   - Populate a branch with minimal prerequisite patches to apply.

Thanks to Andy Lutomirsky, Peter Zijlstra, Ingo Molnar, Borislav Petkov and
Dave Hansen for all the help with this.

The patches apply on top of

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/urgent

and are available from git in

    git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/kpti

and as tarball from

    https://tglx.de/~tglx/patches-kpti-119.tar.bz2

    Signature file for the uncompressed tarball

    https://tglx.de/~tglx/patches-kpti-119.tar.sig

Thanks,

	tglx

             reply index

Thread overview: 118+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-04 14:07 Thomas Gleixner [this message]
2017-12-04 14:07 ` [patch 01/60] x86/entry/64/paravirt: Use paravirt-safe macro to access eflags Thomas Gleixner
2017-12-05 12:17   ` Juergen Gross
2017-12-04 14:07 ` [patch 02/60] x86/unwinder/orc: Dont bail on stack overflow Thomas Gleixner
2017-12-04 20:31   ` Andy Lutomirski
2017-12-04 21:31     ` Thomas Gleixner
2017-12-04 14:07 ` [patch 03/60] x86/unwinder: Handle stack overflows more gracefully Thomas Gleixner
2017-12-04 14:07 ` [patch 04/60] x86/irq: Remove an old outdated comment about context tracking races Thomas Gleixner
2017-12-04 14:07 ` [patch 05/60] x86/irq/64: Print the offending IP in the stack overflow warning Thomas Gleixner
2017-12-04 14:07 ` [patch 06/60] x86/entry/64: Allocate and enable the SYSENTER stack Thomas Gleixner
2017-12-04 14:07 ` [patch 07/60] x86/dumpstack: Add get_stack_info() support for " Thomas Gleixner
2017-12-04 14:07 ` [patch 08/60] x86/entry/gdt: Put per-CPU GDT remaps in ascending order Thomas Gleixner
2017-12-04 14:07 ` [patch 09/60] x86/mm/fixmap: Generalize the GDT fixmap mechanism, introduce struct cpu_entry_area Thomas Gleixner
2017-12-04 14:07 ` [patch 10/60] x86/kasan/64: Teach KASAN about the cpu_entry_area Thomas Gleixner
2017-12-04 14:07 ` [patch 11/60] x86/entry: Fix assumptions that the HW TSS is at the beginning of cpu_tss Thomas Gleixner
2017-12-04 14:07 ` [patch 12/60] x86/dumpstack: Handle stack overflow on all stacks Thomas Gleixner
2017-12-04 14:07 ` [patch 13/60] x86/entry: Move SYSENTER_stack to the beginning of struct tss_struct Thomas Gleixner
2017-12-04 14:07 ` [patch 14/60] x86/entry: Remap the TSS into the CPU entry area Thomas Gleixner
2017-12-04 18:20   ` Borislav Petkov
2017-12-04 14:07 ` [patch 15/60] x86/entry/64: Separate cpu_current_top_of_stack from TSS.sp0 Thomas Gleixner
2017-12-04 14:07 ` [patch 16/60] x86/espfix/64: Stop assuming that pt_regs is on the entry stack Thomas Gleixner
2017-12-04 14:07 ` [patch 17/60] x86/entry/64: Use a per-CPU trampoline stack for IDT entries Thomas Gleixner
2017-12-04 14:07 ` [patch 18/60] x86/entry/64: Return to userspace from the trampoline stack Thomas Gleixner
2017-12-04 14:07 ` [patch 19/60] x86/entry/64: Create a per-CPU SYSCALL entry trampoline Thomas Gleixner
2017-12-04 22:30   ` Andy Lutomirski
2017-12-04 14:07 ` [patch 20/60] x86/entry/64: Move the IST stacks into struct cpu_entry_area Thomas Gleixner
2017-12-04 14:07 ` [patch 21/60] x86/entry/64: Remove the SYSENTER stack canary Thomas Gleixner
2017-12-04 14:07 ` [patch 22/60] x86/entry: Clean up the SYSENTER_stack code Thomas Gleixner
2017-12-04 19:41   ` Borislav Petkov
2017-12-04 14:07 ` [patch 23/60] x86/entry/64: Make cpu_entry_area.tss read-only Thomas Gleixner
2017-12-04 20:25   ` Borislav Petkov
2017-12-04 14:07 ` [patch 24/60] x86/paravirt: Dont patch flush_tlb_single Thomas Gleixner
2017-12-05 12:18   ` Juergen Gross
2017-12-04 14:07 ` [patch 25/60] x86/paravirt: Provide a way to check for hypervisors Thomas Gleixner
2017-12-05 12:19   ` Juergen Gross
2017-12-04 14:07 ` [patch 26/60] x86/cpufeature: Make cpu bugs sticky Thomas Gleixner
2017-12-04 22:39   ` Borislav Petkov
2017-12-04 14:07 ` [patch 27/60] x86/cpufeatures: Add X86_BUG_CPU_INSECURE Thomas Gleixner
2017-12-04 23:18   ` Borislav Petkov
2017-12-04 14:07 ` [patch 28/60] x86/mm/kpti: Disable global pages if KERNEL_PAGE_TABLE_ISOLATION=y Thomas Gleixner
2017-12-05 14:34   ` Borislav Petkov
2017-12-04 14:07 ` [patch 29/60] x86/mm/kpti: Prepare the x86/entry assembly code for entry/exit CR3 switching Thomas Gleixner
2017-12-04 14:07 ` [patch 30/60] x86/mm/kpti: Add infrastructure for page table isolation Thomas Gleixner
2017-12-05 15:20   ` Borislav Petkov
2017-12-04 14:07 ` [patch 31/60] x86/mm/kpti: Add mapping helper functions Thomas Gleixner
2017-12-04 22:27   ` Andy Lutomirski
2017-12-05 16:01   ` Borislav Petkov
2017-12-07  8:33     ` Borislav Petkov
2017-12-04 14:07 ` [patch 32/60] x86/mm/kpti: Allow NX poison to be set in p4d/pgd Thomas Gleixner
2017-12-05 17:09   ` Borislav Petkov
2017-12-04 14:07 ` [patch 33/60] x86/mm/kpti: Allocate a separate user PGD Thomas Gleixner
2017-12-05 18:33   ` Borislav Petkov
2017-12-06 20:56     ` Ingo Molnar
2017-12-04 14:07 ` [patch 34/60] x86/mm/kpti: Populate " Thomas Gleixner
2017-12-05 19:17   ` Borislav Petkov
2017-12-04 14:07 ` [patch 35/60] x86/espfix: Ensure that ESPFIX is visible in " Thomas Gleixner
2017-12-04 22:28   ` Andy Lutomirski
2017-12-04 14:07 ` [patch 36/60] x86/mm/kpti: Add functions to clone kernel PMDs Thomas Gleixner
2017-12-06 15:39   ` Borislav Petkov
2017-12-04 14:07 ` [patch 37/60] x86mm//kpti: Force entry through trampoline when KPTI active Thomas Gleixner
2017-12-06 16:01   ` Borislav Petkov
2017-12-04 14:07 ` [patch 38/60] x86/fixmap: Move cpu entry area into a separate PMD Thomas Gleixner
2017-12-06 18:57   ` Borislav Petkov
2017-12-04 14:07 ` [patch 39/60] x86/mm/kpti: Share cpu_entry_area PMDs Thomas Gleixner
2017-12-06 21:18   ` Borislav Petkov
2017-12-04 14:07 ` [patch 40/60] x86: PMD align entry text Thomas Gleixner
2017-12-07  8:07   ` Borislav Petkov
2017-12-04 14:07 ` [patch 41/60] x86/mm/kpti: Share entry text PMD Thomas Gleixner
2017-12-07  8:24   ` Borislav Petkov
2017-12-04 14:07 ` [patch 42/60] x86/fixmap: Move IDT fixmap into the cpu_entry_area range Thomas Gleixner
2017-12-04 14:07 ` [patch 43/60] x86/fixmap: Add debugstore entries to cpu_entry_area Thomas Gleixner
2017-12-07  9:55   ` Borislav Petkov
2017-12-04 14:07 ` [patch 44/60] x86/events/intel/ds: Map debug buffers in fixmap Thomas Gleixner
2017-12-04 14:07 ` [patch 45/60] x86/fixmap: Add ldt entries to user shared fixmap Thomas Gleixner
2017-12-04 14:07 ` [patch 46/60] x86/ldt: Rename ldt_struct->entries member Thomas Gleixner
2017-12-04 14:07 ` [patch 47/60] x86/ldt: Map LDT entries into fixmap Thomas Gleixner
2017-12-04 22:33   ` Andy Lutomirski
2017-12-04 22:51     ` Thomas Gleixner
2017-12-04 14:07 ` [patch 48/60] x86/mm: Move the CR3 construction functions to tlbflush.h Thomas Gleixner
2017-12-04 14:07 ` [patch 49/60] x86/mm: Remove hard-coded ASID limit checks Thomas Gleixner
2017-12-04 14:07 ` [patch 50/60] x86/mm: Put MMU to hardware ASID translation in one place Thomas Gleixner
2017-12-04 14:07 ` [patch 51/60] x86/mm: Allow flushing for future ASID switches Thomas Gleixner
2017-12-04 22:22   ` Andy Lutomirski
2017-12-04 22:34     ` Dave Hansen
2017-12-04 22:36       ` Andy Lutomirski
2017-12-04 22:47     ` Peter Zijlstra
2017-12-04 22:54       ` Andy Lutomirski
2017-12-04 23:06         ` Peter Zijlstra
2017-12-04 14:07 ` [patch 52/60] x86/mm: Abstract switching CR3 Thomas Gleixner
2017-12-04 14:07 ` [patch 53/60] x86/mm: Use/Fix PCID to optimize user/kernel switches Thomas Gleixner
2017-12-05 21:46   ` Andy Lutomirski
2017-12-05 22:05     ` Peter Zijlstra
2017-12-05 22:08       ` Dave Hansen
2017-12-04 14:08 ` [patch 54/60] x86/mm: Optimize RESTORE_CR3 Thomas Gleixner
2017-12-04 14:08 ` [patch 55/60] x86/mm: Use INVPCID for __native_flush_tlb_single() Thomas Gleixner
2017-12-04 22:25   ` Andy Lutomirski
2017-12-04 22:51     ` Peter Zijlstra
2017-12-05 13:51       ` Dave Hansen
2017-12-05 14:08         ` Peter Zijlstra
2017-12-04 14:08 ` [patch 56/60] x86/mm/kpti: Disable native VSYSCALL Thomas Gleixner
2017-12-04 22:33   ` Andy Lutomirski
2017-12-04 14:08 ` [patch 57/60] x86/mm/kpti: Add Kconfig Thomas Gleixner
2017-12-04 16:54   ` Andy Lutomirski
2017-12-04 16:57     ` Thomas Gleixner
2017-12-05  9:34       ` Thomas Gleixner
2017-12-04 14:08 ` [patch 58/60] x86/mm/debug_pagetables: Add page table directory Thomas Gleixner
2017-12-04 14:08 ` [patch 59/60] x86/mm/dump_pagetables: Check user space page table for WX pages Thomas Gleixner
2017-12-04 14:08 ` [patch 60/60] x86/mm/debug_pagetables: Allow dumping current pagetables Thomas Gleixner
2017-12-04 18:02 ` [patch 00/60] x86/kpti: Kernel Page Table Isolation (was KAISER) Linus Torvalds
2017-12-04 18:18   ` Thomas Gleixner
2017-12-04 18:21     ` Boris Ostrovsky
2017-12-04 18:28     ` Linus Torvalds
2017-12-05 21:49 ` Andy Lutomirski
2017-12-05 21:57   ` Dave Hansen
2017-12-05 23:19     ` Andy Lutomirski
2018-01-19 20:56 ` Andrew Morton
2018-01-19 21:06   ` Dave Hansen
2018-01-20 19:59   ` Thomas Gleixner

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