From: "Yu, Yu-cheng" <yu-cheng.yu@intel.com>
To: Peter Collingbourne <pcc@google.com>
Cc: x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-doc@vger.kernel.org, linux-mm@kvack.org,
linux-arch@vger.kernel.org, linux-api@vger.kernel.org,
Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>,
Balbir Singh <bsingharora@gmail.com>,
Borislav Petkov <bp@alien8.de>,
Cyrill Gorcunov <gorcunov@gmail.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Eugene Syromiatnikov <esyr@redhat.com>,
Florian Weimer <fweimer@redhat.com>,
"H.J. Lu" <hjl.tools@gmail.com>, Jann Horn <jannh@google.com>,
Jonathan Corbet <corbet@lwn.net>,
Kees Cook <keescook@chromium.org>,
Mike Kravetz <mike.kravetz@oracle.com>,
Nadav Amit <nadav.amit@gmail.com>,
Oleg Nesterov <oleg@redhat.com>, Pavel Machek <pavel@ucw.cz>,
Peter Zijlstra <peterz@infradead.org>,
Randy Dunlap <rdunlap@infradead.org>,
"Ravi V. Shankar" <ravi.v.shankar@intel.com>,
Vedvyas Shanbhogue <vedvyas.shanbhogue@intel.com>,
Dave Martin <Dave.Martin@arm.com>,
Weijiang Yang <weijiang.yang@intel.com>,
Pengfei Xu <pengfei.xu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v13 19/26] mm: Re-introduce do_mmap_pgoff()
Date: Fri, 2 Oct 2020 15:57:47 -0700 [thread overview]
Message-ID: <4da742d8-983e-ff24-c74e-3c2de1590a51@intel.com> (raw)
In-Reply-To: <CAMn1gO5H4thZQMKvbWs82DCrXJM1Fu9z1hwt1G_kNwDVGcxeTA@mail.gmail.com>
On 10/2/2020 3:52 PM, Peter Collingbourne wrote:
> On Fri, Oct 2, 2020 at 8:58 AM Yu, Yu-cheng <yu-cheng.yu@intel.com> wrote:
>>
>> On 10/1/2020 7:06 PM, Peter Collingbourne wrote:
>>> On Fri, Sep 25, 2020 at 7:57 AM Yu-cheng Yu <yu-cheng.yu@intel.com> wrote:
>>>>
>>>> There was no more caller passing vm_flags to do_mmap(), and vm_flags was
>>>> removed from the function's input by:
>>>>
>>>> commit 45e55300f114 ("mm: remove unnecessary wrapper function do_mmap_pgoff()").
>>>>
>>>> There is a new user now. Shadow stack allocation passes VM_SHSTK to
>>>> do_mmap(). Re-introduce the vm_flags and do_mmap_pgoff().
>>>
>>> I would prefer to change the callers to pass the additional 0 argument
>>> instead of bringing the wrapper function back, but if we're going to
>>> bring it back then we should fix the naming (both functions take a
>>> pgoff argument, so the previous name do_mmap_pgoff() was just plain
>>> confusing).
>>>
>>> Peter
>>>
>>
>> Thanks for your feedback. Here is the updated patch. I will re-send
>> the whole series later.
>>
>> Yu-cheng
>>
>> ======
>>
>> From 6a9f1e6bcdb6e599a44d5f58cf4cebd28c4634a2 Mon Sep 17 00:00:00 2001
>> From: Yu-cheng Yu <yu-cheng.yu@intel.com>
>> Date: Wed, 12 Aug 2020 14:01:58 -0700
>> Subject: [PATCH 19/26] mm: Re-introduce do_mmap_pgoff()
>
> The subject line of the commit message needs to be updated, but aside from that:
>
> Reviewed-by: Peter Collingbourne <pcc@google.com>
>
> Peter
Thanks for reviewing. I will fix the subject line.
Yu-cheng
next prev parent reply other threads:[~2020-10-02 22:57 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-25 14:56 [PATCH v13 00/26] Control-flow Enforcement: Shadow Stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 01/26] Documentation/x86: Add CET description Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 02/26] x86/cpufeatures: Add CET CPU feature flags for Control-flow Enforcement Technology (CET) Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 03/26] x86/fpu/xstate: Introduce CET MSR XSAVES supervisor states Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 04/26] x86/cet: Add control-protection fault handler Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 05/26] x86/cet/shstk: Add Kconfig option for user-mode Shadow Stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 06/26] x86/mm: Change _PAGE_DIRTY to _PAGE_DIRTY_HW Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 07/26] x86/mm: Remove _PAGE_DIRTY_HW from kernel RO pages Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 08/26] x86/mm: Introduce _PAGE_COW Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 09/26] drm/i915/gvt: Change _PAGE_DIRTY to _PAGE_DIRTY_BITS Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 10/26] x86/mm: Update pte_modify for _PAGE_COW Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 11/26] x86/mm: Update ptep_set_wrprotect() and pmdp_set_wrprotect() for transition from _PAGE_DIRTY_HW to _PAGE_COW Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 12/26] mm: Introduce VM_SHSTK for shadow stack memory Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 13/26] x86/mm: Shadow Stack page fault error checking Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 14/26] x86/mm: Update maybe_mkwrite() for shadow stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 15/26] mm: Fixup places that call pte_mkwrite() directly Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 16/26] mm: Add guard pages around a shadow stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 17/26] mm/mmap: Add shadow stack pages to memory accounting Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 18/26] mm: Update can_follow_write_pte() for shadow stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 19/26] mm: Re-introduce do_mmap_pgoff() Yu-cheng Yu
2020-10-02 2:06 ` Peter Collingbourne
2020-10-02 2:06 ` Peter Collingbourne
2020-10-02 15:58 ` Yu, Yu-cheng
2020-10-02 22:52 ` Peter Collingbourne
2020-10-02 22:52 ` Peter Collingbourne
2020-10-02 22:57 ` Yu, Yu-cheng [this message]
2020-09-25 14:56 ` [PATCH v13 20/26] x86/cet/shstk: User-mode shadow stack support Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 21/26] x86/cet/shstk: Handle signals for shadow stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 22/26] binfmt_elf: Define GNU_PROPERTY_X86_FEATURE_1_AND properties Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 23/26] ELF: Introduce arch_setup_elf_property() Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 24/26] x86/cet/shstk: Handle thread shadow stack Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 25/26] x86/cet/shstk: Add arch_prctl functions for " Yu-cheng Yu
2020-09-25 14:56 ` [PATCH v13 26/26] mm: Introduce PROT_SHSTK " Yu-cheng Yu
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