From: Peter Zijlstra <peterz@infradead.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Xiang Mei <xmei5@asu.edu>, Kees Cook <kees@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, linux-hardening@vger.kernel.org,
Uladzislau Rezki <urezki@gmail.com>,
"Gustavo A . R . Silva" <gustavoars@kernel.org>,
"H . Peter Anvin" <hpa@zytor.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Jennifer Miller <jmill@asu.edu>, Tiffany Bao <tbao@asu.edu>,
Ruoyu Wang <fishw@asu.edu>, Adam Doupe <doupe@asu.edu>,
Kyle Zeng <zengyhkyle@asu.edu>,
Yan Shoshitaishvili <yans@asu.edu>
Subject: Re: [PATCH v2] mm/vmalloc: widen guard region to defeat ENTER-based stack pivot
Date: Wed, 1 Jul 2026 09:27:47 +0200 [thread overview]
Message-ID: <20260701072747.GN48970@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <d9775951-fe04-4d1f-b205-bd4626590f5e@intel.com>
On Mon, Jun 29, 2026 at 03:29:50PM -0700, Dave Hansen wrote:
> But, really, if ENTER is so evil and nobody uses it, shouldn't we just
> have an MSR bit somewhere to tell the CPU to #UD for it rather than
> playing these stack games?
For supervisor mode only, I suppose. We can't ever get rid of userspace
ENTER because legacy I suppose. But we can make sure the kernel is
clean.
So yeah, having a knob to make supervisor-ENTER trap would be useful I
suppose.
next prev parent reply other threads:[~2026-07-01 7:27 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-29 21:47 [PATCH v2] mm/vmalloc: widen guard region to defeat ENTER-based stack pivot Xiang Mei
2026-06-29 22:29 ` Dave Hansen
2026-06-29 23:28 ` Xiang Mei
2026-06-29 23:37 ` Dave Hansen
2026-06-30 1:22 ` Xiang Mei
2026-06-30 14:01 ` Dave Hansen
2026-06-30 14:58 ` Pedro Falcato
2026-07-01 7:23 ` Peter Zijlstra
2026-06-30 22:02 ` Xiang Mei
2026-06-30 22:05 ` Dave Hansen
2026-06-30 22:13 ` H. Peter Anvin
2026-06-30 22:47 ` Xiang Mei
2026-06-30 23:40 ` Dave Hansen
2026-06-30 23:48 ` Xiang Mei
2026-07-01 7:19 ` Peter Zijlstra
2026-06-30 14:40 ` Pedro Falcato
2026-06-30 15:15 ` Dave Hansen
2026-06-30 21:54 ` Dave Hansen
2026-06-30 21:41 ` Xiang Mei
2026-07-01 7:27 ` Peter Zijlstra [this message]
2026-07-01 7:48 ` Peter Zijlstra
2026-07-01 7:58 ` H. Peter Anvin
2026-07-01 8:31 ` Peter Zijlstra
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