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Message-ID: <CALmYWFssV_nqOBKR0=8ka8vOP2v__8Nx_dL_kLs53W_RbYXViQ@mail.gmail.com>
Date:   Wed, 18 Oct 2023 12:07:10 -0700
From:   Jeff Xu <jeffxu@...gle.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     jeffxu@...omium.org, akpm@...ux-foundation.org,
        keescook@...omium.org, jannh@...gle.com, sroettger@...gle.com,
        willy@...radead.org, gregkh@...uxfoundation.org,
        jorgelo@...omium.org, groeck@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, surenb@...gle.com, alex.sierra@....com,
        apopple@...dia.com, aneesh.kumar@...ux.ibm.com,
        axelrasmussen@...gle.com, ben@...adent.org.uk,
        catalin.marinas@....com, david@...hat.com, dwmw@...zon.co.uk,
        ying.huang@...el.com, hughd@...gle.com, joey.gouly@....com,
        corbet@....net, wangkefeng.wang@...wei.com,
        Liam.Howlett@...cle.com, lstoakes@...il.com, mawupeng1@...wei.com,
        linmiaohe@...wei.com, namit@...are.com, peterx@...hat.com,
        peterz@...radead.org, ryan.roberts@....com, shr@...kernel.io,
        vbabka@...e.cz, xiujianfeng@...wei.com, yu.ma@...el.com,
        zhangpeng362@...wei.com, dave.hansen@...el.com, luto@...nel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [RFC PATCH v2 5/8] mseal: Check seal flag for munmap(2)

On Wed, Oct 18, 2023 at 11:27 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Wed, 18 Oct 2023 at 10:14, Jeff Xu <jeffxu@...gle.com> wrote:
> This is simply not up for discussion. Any flag for "ignore sealing" is wrong.
>
> We do have one special "unmap" case, namely "unmap_vmas()' called at
> last mmput() -> __mmput() -> exit_mmap().
>
> And yes, that is called at munmap() time too, but that's after the
> point of no return after we've already removed the vma's from the VM
> lists. So it's long after any error cases have been checked.
>
Ah. I see.
I didn't know there was no legit case, which is what I worried about before.
this flag can be removed.

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