linux-kernel - Re: [PATCH v2 0/2] Handle IST interrupts from userspace on the normal stack

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Message-ID: <CALCETrWrQPfLzMVRAtAVYrtn=H46Wo0At1adpEyd-z=GADTqvQ@mail.gmail.com>
Date:	Thu, 13 Nov 2014 15:19:32 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>, X86 ML <x86@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <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: Re: [PATCH v2 0/2] Handle IST interrupts from userspace on the normal stack

On Thu, Nov 13, 2014 at 2:31 PM, Andy Lutomirski <luto@...capital.net> wrote:
> 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.
>
> Andy Lutomirski (2):
>   x86, entry: Switch stacks on a paranoid entry from userspace
>   uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY_RESUME
>

I reversed the order of the patches -- oops.  If I send v3, I'll fix that.

--Andy

>  Documentation/x86/entry_64.txt         | 18 +++++---
>  Documentation/x86/x86_64/kernel-stacks |  8 ++--
>  arch/x86/include/asm/thread_info.h     |  2 +-
>  arch/x86/kernel/entry_64.S             | 82 +++++++++++++++++-----------------
>  arch/x86/kernel/traps.c                | 23 +++-------
>  kernel/events/uprobes.c                |  1 -
>  6 files changed, 65 insertions(+), 69 deletions(-)
>
> --
> 1.9.3
>



-- 
Andy Lutomirski
AMA Capital Management, LLC
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