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* [PATCH 00/13] Virtually mapped stacks with guard pages (x86, core)
@ 2016-06-16  0:28 Andy Lutomirski
  2016-06-16  0:28 ` [PATCH 01/13] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable() Andy Lutomirski
                   ` (14 more replies)
  0 siblings, 15 replies; 60+ messages in thread
From: Andy Lutomirski @ 2016-06-16  0:28 UTC (permalink / raw)
  To: linux-kernel, x86, Borislav Petkov
  Cc: Nadav Amit, Kees Cook, Brian Gerst, kernel-hardening,
	Linus Torvalds, Josh Poimboeuf, Andy Lutomirski

Since the dawn of time, a kernel stack overflow has been a real PITA
to debug, has caused nondeterministic crashes some time after the
actual overflow, and has generally been easy to exploit for root.

With this series, arches can enable HAVE_ARCH_VMAP_STACK.  Arches
that enable it (just x86 for now) get virtually mapped stacks with
guard pages.  This causes reliable faults when the stack overflows.

If the arch implements it well, we get a nice OOPS on stack overflow
(as opposed to panicing directly or otherwise exploding badly).  On
x86, the OOPS is nice, has a usable call trace, and the overflowing
task is killed cleanly.

This does not address interrupt stacks.

Andy Lutomirski (12):
  x86/cpa: In populate_pgd, don't set the pgd entry until it's populated
  x86/cpa: Warn if kernel_unmap_pages_in_pgd is used inappropriately
  mm: Track NR_KERNEL_STACK in pages instead of number of stacks
  mm: Move memcg stack accounting to account_kernel_stack
  fork: Add generic vmalloced stack support
  x86/die: Don't try to recover from an OOPS on a non-default stack
  x86/dumpstack: When OOPSing, rewind the stack before do_exit
  x86/dumpstack: When dumping stack bytes due to OOPS, start with
    regs->sp
  x86/dumpstack: Try harder to get a call trace on stack overflow
  x86/dumpstack/64: Handle faults when printing the "Stack:" part of an
    OOPS
  x86/mm/64: Enable vmapped stacks
  x86/mm: Improve stack-overflow #PF handling

Ingo Molnar (1):
  x86/mm/hotplug: Don't remove PGD entries in remove_pagetable()

 arch/Kconfig                     | 12 ++++++++++
 arch/x86/Kconfig                 |  1 +
 arch/x86/entry/entry_32.S        | 11 +++++++++
 arch/x86/entry/entry_64.S        | 11 +++++++++
 arch/x86/include/asm/switch_to.h | 28 +++++++++++++++++++++-
 arch/x86/include/asm/traps.h     |  6 +++++
 arch/x86/kernel/dumpstack.c      | 17 +++++++++++++-
 arch/x86/kernel/dumpstack_32.c   |  4 +++-
 arch/x86/kernel/dumpstack_64.c   | 16 ++++++++++---
 arch/x86/kernel/traps.c          | 32 +++++++++++++++++++++++++
 arch/x86/mm/fault.c              | 39 ++++++++++++++++++++++++++++++
 arch/x86/mm/init_64.c            | 27 ---------------------
 arch/x86/mm/pageattr.c           |  7 +++++-
 arch/x86/mm/tlb.c                | 15 ++++++++++++
 fs/proc/meminfo.c                |  2 +-
 kernel/fork.c                    | 51 ++++++++++++++++++++++++++++++----------
 mm/page_alloc.c                  |  3 +--
 17 files changed, 233 insertions(+), 49 deletions(-)

-- 
2.7.4

^ permalink raw reply	[flat|nested] 60+ messages in thread
* [PATCH -v2 0/3] x86/MSR: Improve unhandled MSR access error message
@ 2016-07-04 22:31 Borislav Petkov
  2016-07-04 22:31 ` [PATCH -v2 1/3] x86/dumpstack: Honor supplied @regs arg Borislav Petkov
                   ` (3 more replies)
  0 siblings, 4 replies; 60+ messages in thread
From: Borislav Petkov @ 2016-07-04 22:31 UTC (permalink / raw)
  To: LKML; +Cc: Andrew Morton, Andy Lutomirski, X86 ML

From: Borislav Petkov <bp@suse.de>

Hi all,

here's v2 with review feedback integrated.

Changelog:

v1:

here's a simple patchset improving the error message we're dumping when
an unchecked MSR is being done. Patch 3 has an example which explains
the improvement in detail.


Andy Lutomirski (1):
  x86/dumpstack: Honor supplied @regs arg

Borislav Petkov (2):
  printk: Make the printk*once() variants return a value
  x86/dumpstack: Add show_stack_regs() and use it

 arch/x86/include/asm/kdebug.h  |  1 +
 arch/x86/kernel/dumpstack.c    |  5 +++++
 arch/x86/kernel/dumpstack_32.c |  4 +++-
 arch/x86/kernel/dumpstack_64.c |  4 +++-
 arch/x86/mm/extable.c          | 13 ++++++++-----
 include/linux/printk.h         | 17 ++++++++++++-----
 6 files changed, 32 insertions(+), 12 deletions(-)

-- 
2.7.3

^ permalink raw reply	[flat|nested] 60+ messages in thread

end of thread, other threads:[~2016-07-10 12:33 UTC | newest]

Thread overview: 60+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-06-16  0:28 [PATCH 00/13] Virtually mapped stacks with guard pages (x86, core) Andy Lutomirski
2016-06-16  0:28 ` [PATCH 01/13] x86/mm/hotplug: Don't remove PGD entries in remove_pagetable() Andy Lutomirski
2016-06-16  0:28 ` [PATCH 02/13] x86/cpa: In populate_pgd, don't set the pgd entry until it's populated Andy Lutomirski
2016-06-16  0:28 ` [PATCH 03/13] x86/cpa: Warn if kernel_unmap_pages_in_pgd is used inappropriately Andy Lutomirski
2016-06-16  0:28 ` [PATCH 04/13] mm: Track NR_KERNEL_STACK in pages instead of number of stacks Andy Lutomirski
2016-06-16 11:10   ` Vladimir Davydov
2016-06-16 17:21     ` Andy Lutomirski
2016-06-16 19:20       ` Andy Lutomirski
2016-06-16 15:33   ` Josh Poimboeuf
2016-06-16 17:39     ` Andy Lutomirski
2016-06-16 19:39       ` Josh Poimboeuf
2016-06-16  0:28 ` [PATCH 05/13] mm: Move memcg stack accounting to account_kernel_stack Andy Lutomirski
2016-06-16  0:28 ` [PATCH 06/13] fork: Add generic vmalloced stack support Andy Lutomirski
2016-06-16 17:25   ` Kees Cook
2016-06-16 17:37     ` Andy Lutomirski
2016-06-16  0:28 ` [PATCH 07/13] x86/die: Don't try to recover from an OOPS on a non-default stack Andy Lutomirski
2016-06-16  0:28 ` [PATCH 08/13] x86/dumpstack: When OOPSing, rewind the stack before do_exit Andy Lutomirski
2016-06-16 17:50   ` Josh Poimboeuf
2016-06-16 17:57     ` Andy Lutomirski
2016-06-16  0:28 ` [PATCH 09/13] x86/dumpstack: When dumping stack bytes due to OOPS, start with regs->sp Andy Lutomirski
2016-06-16 11:56   ` Borislav Petkov
2016-07-08 12:07   ` [tip:x86/debug] x86/dumpstack: Honor supplied @regs arg tip-bot for Andy Lutomirski
2016-06-16  0:28 ` [PATCH 10/13] x86/dumpstack: Try harder to get a call trace on stack overflow Andy Lutomirski
2016-06-16 18:16   ` Josh Poimboeuf
2016-06-16 18:22     ` Andy Lutomirski
2016-06-16 18:33       ` Josh Poimboeuf
2016-06-16 18:37         ` Andy Lutomirski
2016-06-16 18:54           ` Josh Poimboeuf
2016-06-16  0:28 ` [PATCH 11/13] x86/dumpstack/64: Handle faults when printing the "Stack:" part of an OOPS Andy Lutomirski
2016-06-16  0:28 ` [PATCH 12/13] x86/mm/64: Enable vmapped stacks Andy Lutomirski
2016-06-16  4:17   ` Mika Penttilä
2016-06-16  5:33     ` Andy Lutomirski
2016-06-16 13:11       ` [kernel-hardening] " Rik van Riel
2016-06-16  0:28 ` [PATCH 13/13] x86/mm: Improve stack-overflow #PF handling Andy Lutomirski
2016-06-16  6:05 ` [PATCH 00/13] Virtually mapped stacks with guard pages (x86, core) Heiko Carstens
2016-06-16 17:50   ` Andy Lutomirski
2016-06-16 18:14     ` Andy Lutomirski
2016-06-16 21:27       ` Andy Lutomirski
2016-06-17  3:58   ` Andy Lutomirski
2016-06-17  7:27     ` Heiko Carstens
2016-06-17 17:38       ` Andy Lutomirski
2016-06-20  5:58         ` Heiko Carstens
2016-06-20  6:01           ` Andy Lutomirski
2016-06-20  7:07             ` Heiko Carstens
2016-06-16 17:24 ` Kees Cook
2016-07-04 22:31 [PATCH -v2 0/3] x86/MSR: Improve unhandled MSR access error message Borislav Petkov
2016-07-04 22:31 ` [PATCH -v2 1/3] x86/dumpstack: Honor supplied @regs arg Borislav Petkov
2016-07-04 22:31 ` [PATCH -v2 2/3] printk: Make the printk*once() variants return a value Borislav Petkov
2016-07-08 12:08   ` [tip:x86/debug] " tip-bot for Borislav Petkov
2016-07-09  2:40     ` Joe Perches
2016-07-09  7:50       ` Borislav Petkov
2016-07-09 17:56         ` Joe Perches
2016-07-10  6:49           ` Borislav Petkov
2016-07-10  8:23             ` Joe Perches
2016-07-10 12:06               ` Borislav Petkov
2016-07-10 12:33                 ` Joe Perches
2016-07-04 22:31 ` [PATCH -v2 3/3] x86/dumpstack: Add show_stack_regs() and use it Borislav Petkov
2016-07-08 12:08   ` [tip:x86/debug] " tip-bot for Borislav Petkov
2016-07-06 12:58 ` [PATCH -v2 0/3] x86/MSR: Improve unhandled MSR access error message Andy Lutomirski
2016-07-06 13:11   ` Borislav Petkov

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