From: Andy Lutomirski <luto@kernel.org>
To: Waiman Long <longman@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andrew Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>, X86 ML <x86@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH] x86/mm/fault: Allow stack access below %rsp
Date: Fri, 2 Nov 2018 13:11:50 -0700 [thread overview]
Message-ID: <CALCETrVqe2BhHTMG0joSC3eTk6CibAtn1c5gd7Ou6zLXQrgO3w@mail.gmail.com> (raw)
In-Reply-To: <fb715262-df9e-3e77-6964-80ec4a1c7a24@redhat.com>
On Fri, Nov 2, 2018 at 12:50 PM Waiman Long <longman@redhat.com> wrote:
>
> On 11/02/2018 03:44 PM, Dave Hansen wrote:
> > On 11/2/18 12:40 PM, Waiman Long wrote:
> >> The 64k+ limit check is kind of arbitrary. So the check is now removed
> >> to just let expand_stack() decide if a segmentation fault should happen.
> > With the 64k check removed, what's the next limit that we bump into? Is
> > it just the stack_guard_gap space above the next-lowest VMA?
>
> I think it is both the stack_guard_gap space above the next lowest VMA
> and the rlimit(RLIMIT_STACK).
>
Did the non-working programs ever work? Because, if not, I say let them fail.
next prev parent reply other threads:[~2018-11-02 20:12 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-02 19:40 [RFC PATCH] x86/mm/fault: Allow stack access below %rsp Waiman Long
2018-11-02 19:44 ` Dave Hansen
2018-11-02 19:50 ` Waiman Long
2018-11-02 20:11 ` Andy Lutomirski [this message]
2018-11-02 20:34 ` Waiman Long
2018-11-02 22:28 ` Dave Hansen
2018-11-05 5:11 ` Andy Lutomirski
2018-11-05 5:14 ` Andy Lutomirski
2018-11-05 17:20 ` Dave Hansen
2018-11-05 19:21 ` Andy Lutomirski
2018-11-05 16:27 ` Waiman Long
2018-11-05 17:51 ` Dave Hansen
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