From: Dave Hansen <dave.hansen@intel.com>
To: Xiang Mei <xmei5@asu.edu>, "H. Peter Anvin" <hpa@zytor.com>
Cc: 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>,
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: Tue, 30 Jun 2026 16:40:21 -0700 [thread overview]
Message-ID: <9ac1d214-aa8a-42e5-8903-15f8eac5cddd@intel.com> (raw)
In-Reply-To: <CAPpSM+TM6VL36XAoDMsoCr6u+c0feab8DzXuahjpNfVJQ7g2JA@mail.gmail.com>
On 6/30/26 15:47, Xiang Mei wrote:
> On Tue, Jun 30, 2026 at 3:14 PM H. Peter Anvin <hpa@zytor.com> wrote:
>> On 2026-06-30 15:05, Dave Hansen wrote:
>>> On 6/30/26 15:02, Xiang Mei wrote:
>>>> Please feel free to ask any questions; I am glad to help.
>>> How do the CET features: kernel IBT and the (theoretical for Linux)
>>> kernel shadow stacks impact the situation?
>> CET should prevent this from being the target of a JOP attack.
>>
> You are right; CET breaks the assumption that this technique needs a
> CFH primitive.
I'm not sure what you're saying.
Are you saying that this ENTER-based technique is worthless if IBT is in
play, so the new stack gap is a worthless mitigation too?
next prev parent reply other threads:[~2026-06-30 23:40 UTC|newest]
Thread overview: 17+ 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
2026-06-30 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 [this message]
2026-06-30 23:48 ` Xiang Mei
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
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