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.
next prev parent reply other threads:[~2026-04-21 14:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-21 2:09 [PATCH] mm: Add RWH_RMAP_EXCLUDE flag to exclude files from rmap sharing Yibin Liu
2026-04-21 14:38 ` Matthew Wilcox [this message]
2026-04-21 15:37 ` Pedro Falcato
2026-04-22 7:19 ` David Hildenbrand (Arm)
2026-04-21 19:46 ` Mateusz Guzik
2026-04-22 13:03 ` 答复: " Yibin Liu
2026-04-22 10:49 ` Lorenzo Stoakes
2026-04-22 12:51 ` 答复: " Yibin Liu
2026-04-22 16:16 ` Lorenzo Stoakes
2026-04-24 1:08 ` 答复: " Yibin Liu
2026-04-24 3:20 ` Matthew Wilcox
2026-04-24 6:20 ` Mateusz Guzik
2026-04-24 6:54 ` Mateusz Guzik
-- strict thread matches above, loose matches on Subject: below --
2026-05-01 6:26 kernel test robot
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