linux-kernel - Re: [PATCH 4/7] x86/dumpstack: If addr

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Message-ID: <CALCETrVg_LeHu3iCa-yGT6NubF6Vxo338wfytG-jWa0_+mmgmg@mail.gmail.com>
Date:	Sun, 29 May 2016 12:08:29 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Brian Gerst <brgerst@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 4/7] x86/dumpstack: If addr_limit is non-default, display it

On May 29, 2016 11:42 AM, "Boris Petkov" <bp@...en8.de> wrote:
>
> Andy Lutomirski <luto@...capital.net> wrote:
> >Easier said than done.  struct thread_info doesn't have addr_limit on
> >sensible architectures (e.g. sparc), and I'd rather not stick a bunch
> >of ifdefs in generic code.
>
> It's not like it doesn't have an actual address limit though - I'm guessing it is something like the max userspace address on the arch... UINT_MAX or somesuch.

Sure, but how do I implement that?  There's no "does this arch have
addr_limit in thread_info" general flag that I know of.

--Andy