linux-kernel - Re: [PATCH v4 1/5] uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY

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Date:	Mon, 24 Nov 2014 09:58:23 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"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>
Subject: Re: [PATCH v4 1/5] uprobes, x86: Fix _TIF_UPROBE vs _TIF_NOTIFY_RESUME

On Sat, Nov 22, 2014 at 8:55 AM, Borislav Petkov <bp@...en8.de> wrote:
> On Fri, Nov 21, 2014 at 01:26:07PM -0800, Andy Lutomirski wrote:
>> x86 call do_notify_resume on paranoid returns if TIF_UPROBE is set
>> but not on non-paranoid returns.  I suspect that this is a mistake
>> and that the code only works because int3 is paranoid.
>>
>> Setting _TIF_NOTIFY_RESUME in the uprobe code was probably a
>> workaround for the x86 bug.  With that bug fixed, we can remove
>> _TIF_NOTIFY_RESUME from the uprobes code.
>>
>> Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
>> Reported-by: Oleg Nesterov <oleg@...hat.com>
>> Signed-off-by: Andy Lutomirski <luto@...capital.net>
>
> Acked-by: Borislav Petkov <bp@...e.de>
>

This one is now upstream, so I'm dropping it.

--Andy

> --
> Regards/Gruss,
>     Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --



-- 
Andy Lutomirski
AMA Capital Management, LLC
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