linux-kernel - Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on 64-bit kernels

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Message-ID: <CALCETrU1DTc1Qo7ua5Pa0P8-XE8VoKLNoY17M6rGmJB2GP5KBw@mail.gmail.com>
Date:	Sat, 12 Apr 2014 18:29:11 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Alexander van Heukelum <heukelum@...tmail.fm>,
	Brian Gerst <brgerst@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, stable@...per.es
Subject: Re: [tip:x86/urgent] x86-64, modify_ldt: Ban 16-bit segments on
 64-bit kernels

On Sat, Apr 12, 2014 at 6:25 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Sat, Apr 12, 2014 at 5:03 PM, H. Peter Anvin <hpa@...or.com> wrote:
>> A signal arriving while in the user space trampoline could seriously
>> complicate life.
>
> Agreed.

Maybe I don't agree.  Have signals ever worked sensibly when delivered
to a task running on an unexpected stack or code segment?

--Andy
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