linux-kernel - [PATCH v3 0/3] Handle IST interrupts from userspace on the normal stack

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Date:	Tue, 18 Nov 2014 15:15:16 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>, x86@...nel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Tony Luck <tony.luck@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: [PATCH v3 0/3] Handle IST interrupts from userspace on the normal stack

We currently run IST interrupt handlers on the IST stack.  Changing
it may simplify a few things.  See patch 2 for details.

Patch 1 is a fix for a not-quite-bug in uprobes that Oleg noticed
that would be exposed by patch 2.

NB: Tony has seen odd behavior when stress-testing injected
machine checks with this series applied.  I suspect that
it's a bug in something else, possibly his BIOS.  Bugs in
this series shouldn't be ruled out, though.

Andy Lutomirski (3):
  uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY_RESUME
  x86, entry: Switch stacks on a paranoid entry from userspace
  sched, x86: Check that we're on the right stack in schedule and
    __might_sleep

 Documentation/x86/entry_64.txt         | 18 ++++---
 Documentation/x86/x86_64/kernel-stacks |  8 ++--
 arch/x86/Kconfig                       |  1 +
 arch/x86/include/asm/thread_info.h     | 19 +++++++-
 arch/x86/kernel/entry_64.S             | 86 ++++++++++++++++++----------------
 arch/x86/kernel/irq_32.c               | 13 ++---
 arch/x86/kernel/traps.c                | 23 ++-------
 include/linux/thread_info.h            |  7 +++
 kernel/Kconfig.locks                   |  3 ++
 kernel/events/uprobes.c                |  1 -
 kernel/sched/core.c                    | 14 ++++--
 11 files changed, 109 insertions(+), 84 deletions(-)

-- 
1.9.3

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