linux-kernel - Re: [PATCH v4 1/8] mm: make PTE_MARKER_SWAPIN

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZKl6Fhxv6ruwGzpA@xz-m1.local>
Date:   Sat, 8 Jul 2023 11:00:38 -0400
From:   Peter Xu <peterx@...hat.com>
To:     Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brian Geffon <bgeffon@...gle.com>,
        Christian Brauner <brauner@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Gaosheng Cui <cuigaosheng1@...wei.com>,
        Huang Ying <ying.huang@...el.com>,
        Hugh Dickins <hughd@...gle.com>,
        James Houghton <jthoughton@...gle.com>,
        "Jan Alexander Steffens (heftig)" <heftig@...hlinux.org>,
        Jiaqi Yan <jiaqiyan@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Muchun Song <muchun.song@...ux.dev>,
        Nadav Amit <namit@...are.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Ryan Roberts <ryan.roberts@....com>,
        Shuah Khan <shuah@...nel.org>,
        Suleiman Souhlal <suleiman@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        "T.J. Alumbaugh" <talumbau@...gle.com>,
        Yu Zhao <yuzhao@...gle.com>,
        ZhangPeng <zhangpeng362@...wei.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 1/8] mm: make PTE_MARKER_SWAPIN_ERROR more general

On Fri, Jul 07, 2023 at 02:55:33PM -0700, Axel Rasmussen wrote:
> -static inline swp_entry_t make_swapin_error_entry(void)
> +static inline swp_entry_t make_poisoned_swp_entry(void)
>  {
> -	return make_pte_marker_entry(PTE_MARKER_SWAPIN_ERROR);
> +	return make_pte_marker_entry(PTE_MARKER_POISONED);
>  }
>  
> -static inline int is_swapin_error_entry(swp_entry_t entry)
> +static inline int is_poisoned_swp_entry(swp_entry_t entry)
>  {
>  	return is_pte_marker_entry(entry) &&
> -	    (pte_marker_get(entry) & PTE_MARKER_SWAPIN_ERROR);
> +	    (pte_marker_get(entry) & PTE_MARKER_POISONED);
>  }

These two can be slightly confusing when put together with hwpoison
entries, so maybe it'll be good to somehow attach a "marker" inside the
names:

  make_poisoned_marker_entry()
  is_pointed_marker_entry()

(the old helpers didn't attach a "marker" keyword because we started with
 consuming a swp entry type, I think)

But we can still identify easily with "hw" prefix being there or not, so
it's still pretty clear at least to me.  I'd say not worth a repost, so
your call to keep or change, just in case a new version for other reasons.
All fine here now:

Acked-by: Peter Xu <peterx@...hat.com>

Thanks,

-- 
Peter Xu