linux-kernel - Re: [RFC PATCH v3 11/11] mseal:add documentation

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Message-ID: <CAHk-=wgn02cpoFEDQGgS+5BUqA2z-=Ks9+PNd-pEJy8h+NOs5g@mail.gmail.com>
Date:   Tue, 12 Dec 2023 16:39:31 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     jeffxu@...omium.org
Cc:     akpm@...ux-foundation.org, keescook@...omium.org, jannh@...gle.com,
        sroettger@...gle.com, willy@...radead.org,
        gregkh@...uxfoundation.org, jeffxu@...gle.com,
        jorgelo@...omium.org, groeck@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, pedro.falcato@...il.com, dave.hansen@...el.com,
        linux-hardening@...r.kernel.org, deraadt@...nbsd.org
Subject: Re: [RFC PATCH v3 11/11] mseal:add documentation

On Tue, 12 Dec 2023 at 15:17, <jeffxu@...omium.org> wrote:
> +
> +**types**: bit mask to specify the sealing types, they are:

I really want a real-life use-case for more than one bit of "don't modify".

IOW, when would you *ever* say "seal this area, but MADV_DONTNEED is ok"?

Or when would you *ever* say "seal this area, but mprotect()" is ok.

IOW, I want to know why we don't just do the BSD immutable thing, and
why we need this multi-level sealing thing.

               Linus