linux-mm.kvack.org archive mirror
 help / color / mirror / Atom feed
From: Matthew Wilcox <willy@infradead.org>
To: Yibin Liu <liuyibin@hygon.cn>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
	Liam.Howlett@oracle.com, viro@zeniv.linux.org.uk,
	brauner@kernel.org, mjguzik@gmail.com, wujianyong@hygon.cn,
	huangsj@hygon.cn, zhongyuan@hygon.cn
Subject: Re: [PATCH] mm: Add RWH_RMAP_EXCLUDE flag to exclude files from rmap sharing
Date: Tue, 21 Apr 2026 15:38:45 +0100	[thread overview]
Message-ID: <aeeL9TVSZJe3sD6u@casper.infradead.org> (raw)
In-Reply-To: <20260421020932.3212532-1-liuyibin@hygon.cn>

On Tue, Apr 21, 2026 at 10:09:32AM +0800, Yibin Liu wrote:
> +	/* Prevent truncate on files marked as RMAP_EXCLUDE (e.g., libc, ld.so) */
> +	if (filp && (filp->f_mode & FMODE_RMAP_EXCLUDE))
> +		return -EPERM;

You can't do this.  It means I can prevent anybody else from truncating
a file which I can open.


  reply	other threads:[~2026-04-21 14:38 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-21  2:09 Yibin Liu
2026-04-21 14:38 ` Matthew Wilcox [this message]
2026-04-21 15:37 ` Pedro Falcato
2026-04-21 19:46 ` Mateusz Guzik

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=aeeL9TVSZJe3sD6u@casper.infradead.org \
    --to=willy@infradead.org \
    --cc=Liam.Howlett@oracle.com \
    --cc=akpm@linux-foundation.org \
    --cc=brauner@kernel.org \
    --cc=huangsj@hygon.cn \
    --cc=linux-mm@kvack.org \
    --cc=liuyibin@hygon.cn \
    --cc=mjguzik@gmail.com \
    --cc=viro@zeniv.linux.org.uk \
    --cc=wujianyong@hygon.cn \
    --cc=zhongyuan@hygon.cn \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox