From: Kees Cook <keescook@chromium.org>
To: jeffxu@chromium.org
Cc: dave.hansen@intel.com, luto@kernel.org, jorgelo@chromium.org,
groeck@chromium.org, jannh@google.com, sroettger@google.com,
akpm@linux-foundation.org, jeffxu@google.com,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-mm@kvack.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH 0/6] Memory Mapping (VMA) protection using PKU - set 1
Date: Tue, 16 May 2023 13:08:44 -0700 [thread overview]
Message-ID: <202305161307.4A16BB6A47@keescook> (raw)
In-Reply-To: <20230515130553.2311248-1-jeffxu@chromium.org>
On Mon, May 15, 2023 at 01:05:46PM +0000, jeffxu@chromium.org wrote:
> This patch introduces a new flag, PKEY_ENFORCE_API, to the pkey_alloc()
> function. When a PKEY is created with this flag, it is enforced that any
> thread that wants to make changes to the memory mapping (such as mprotect)
> of the memory must have write access to the PKEY. PKEYs created without
> this flag will continue to work as they do now, for backwards
> compatibility.
>
> Only PKEY created from user space can have the new flag set, the PKEY
> allocated by the kernel internally will not have it. In other words,
> ARCH_DEFAULT_PKEY(0) and execute_only_pkey won’t have this flag set,
> and continue work as today.
Cool! Yeah, this looks like it could become quite useful. I assume
V8 folks are on board with this API, etc?
> This set of patch covers mprotect/munmap, I plan to work on other
> syscalls after this.
Which ones are on your list currently?
--
Kees Cook
next prev parent reply other threads:[~2023-05-16 20:08 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-15 13:05 jeffxu
2023-05-15 13:05 ` [PATCH 1/6] PKEY: Introduce PKEY_ENFORCE_API flag jeffxu
2023-05-16 23:14 ` Dave Hansen
2023-05-16 23:55 ` Jeff Xu
2023-05-17 11:07 ` Stephen Röttger
2023-05-15 13:05 ` [PATCH 2/6] PKEY: Add arch_check_pkey_enforce_api() jeffxu
2023-05-18 21:43 ` Dave Hansen
2023-05-18 22:51 ` Jeff Xu
2023-05-19 0:00 ` Dave Hansen
2023-05-19 11:22 ` Stephen Röttger
2023-05-15 13:05 ` [PATCH 3/6] PKEY: Apply PKEY_ENFORCE_API to mprotect jeffxu
2023-05-16 20:07 ` Kees Cook
2023-05-16 22:23 ` Jeff Xu
2023-05-16 23:18 ` Dave Hansen
2023-05-16 23:36 ` Jeff Xu
2023-05-17 4:50 ` Jeff Xu
2023-05-15 13:05 ` [PATCH 4/6] PKEY:selftest pkey_enforce_api for mprotect jeffxu
2023-05-15 13:05 ` [PATCH 5/6] KEY: Apply PKEY_ENFORCE_API to munmap jeffxu
2023-05-16 20:06 ` Kees Cook
2023-05-16 22:24 ` Jeff Xu
2023-05-16 23:23 ` Dave Hansen
2023-05-17 0:08 ` Jeff Xu
2023-05-15 13:05 ` [PATCH 6/6] PKEY:selftest pkey_enforce_api for munmap jeffxu
2023-05-15 14:28 ` [PATCH 0/6] Memory Mapping (VMA) protection using PKU - set 1 Dave Hansen
2023-05-15 15:03 ` Stephen Röttger
2023-05-16 7:06 ` Stephen Röttger
2023-05-16 22:41 ` Dave Hansen
2023-05-17 10:51 ` Stephen Röttger
2023-05-17 15:07 ` Dave Hansen
2023-05-17 15:21 ` Jeff Xu
2023-05-17 15:29 ` Dave Hansen
2023-05-17 23:48 ` Jeff Xu
2023-05-18 15:37 ` Dave Hansen
2023-05-18 20:20 ` Jeff Xu
2023-05-18 21:04 ` Dave Hansen
2023-05-19 11:13 ` Stephen Röttger
2023-05-24 20:15 ` Jeff Xu
2023-05-16 20:08 ` Kees Cook [this message]
2023-05-16 22:17 ` Jeff Xu
2023-05-16 22:30 ` Dave Hansen
2023-05-16 23:39 ` Jeff Xu
2023-05-17 10:49 ` Stephen Röttger
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