linux-kernel - Re: [PATCH 3/6] mm: introduce secretmemfd system call to create "secret" memory areas

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Date:   Tue, 21 Jul 2020 12:59:22 +0200
From:   "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Idan Yaniv <idan.yaniv@....com>,
        Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>, linux-nvdimm@...ts.01.org,
        linux-riscv@...ts.infradead.org,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH 3/6] mm: introduce secretmemfd system call to create
 "secret" memory areas

Hi Mike,

On Mon, 20 Jul 2020 at 11:26, Mike Rapoport <rppt@...nel.org> wrote:
>
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> Introduce "secretmemfd" system call with the ability to create memory areas
> visible only in the context of the owning process and not mapped not only
> to other processes but in the kernel page tables as well.
>
> The user will create a file descriptor using the secretmemfd system call

Without wanting to start a bikeshed discussion, the more common
convention in recently added system calls is to use an underscore in
names that consist of multiple clearly distinct words. See many
examples in  https://man7.org/linux/man-pages/man2/syscalls.2.html.

Thus, I'd suggest at least secret_memfd().

Also, I wonder whether memfd_secret() might not be even better.
There's plenty of precedent for the naming style where related APIs
share a common prefix [1].

Thanks,

Michael

[1] Some examples:

       epoll_create(2)
       epoll_create1(2)
       epoll_ctl(2)
       epoll_pwait(2)
       epoll_wait(2)

       mq_getsetattr(2)
       mq_notify(2)
       mq_open(2)
       mq_timedreceive(2)
       mq_timedsend(2)
       mq_unlink(2)

       sched_get_affinity(2)
       sched_get_priority_max(2)
       sched_get_priority_min(2)
       sched_getaffinity(2)
       sched_getattr(2)
       sched_getparam(2)
       sched_getscheduler(2)
       sched_rr_get_interval(2)
       sched_set_affinity(2)
       sched_setaffinity(2)
       sched_setattr(2)
       sched_setparam(2)
       sched_setscheduler(2)
       sched_yield(2)

       timer_create(2)
       timer_delete(2)
       timer_getoverrun(2)
       timer_gettime(2)
       timer_settime(2)

       timerfd_create(2)
       timerfd_gettime(2)
       timerfd_settime(2)




-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/