From: Al Viro <viro@zeniv.linux.org.uk>
To: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org, "Jan Kara" <jack@suse.cz>,
"Jeff Layton" <jlayton@kernel.org>,
"Amir Goldstein" <amir73il@gmail.com>,
"Lennart Poettering" <lennart@poettering.net>,
"Zbigniew Jędrzejewski-Szmek" <zbyszek@in.waw.pl>,
"Josef Bacik" <josef@toxicpanda.com>
Subject: Re: [PATCH 3/3] fs: add immutable rootfs
Date: Tue, 6 Jan 2026 22:59:17 +0000 [thread overview]
Message-ID: <20260106225917.GL1712166@ZenIV> (raw)
In-Reply-To: <20260106-verpachten-antrag-5b610d1ec4d0@brauner>
On Tue, Jan 06, 2026 at 11:07:32PM +0100, Christian Brauner wrote:
>
> Afaict, FS_IMMUTABLE_FL can be cleared by a sufficiently privileged
> process breaking the promise that this is a permanently immutable
> rootfs.
Not on ramfs:
int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
struct file_kattr *fa)
{
struct inode *inode = d_inode(dentry);
struct file_kattr old_ma = {};
int err;
if (!inode->i_op->fileattr_set)
return -ENOIOCTLCMD;
and that's it, priveleges do not matter.
next prev parent reply other threads:[~2026-01-06 22:58 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-02 14:36 [PATCH 0/3] fs: add immutable rootfs and support pivot_root() in the initramfs Christian Brauner
2026-01-02 14:36 ` [PATCH 1/3] fs: ensure that internal tmpfs mount gets mount id zero Christian Brauner
2026-01-02 14:36 ` [PATCH 2/3] fs: add init_pivot_root() Christian Brauner
2026-01-02 14:36 ` [PATCH 3/3] fs: add immutable rootfs Christian Brauner
2026-01-04 7:27 ` Al Viro
2026-01-04 7:41 ` Al Viro
2026-01-06 22:07 ` Christian Brauner
2026-01-06 22:59 ` Al Viro [this message]
2026-01-07 10:53 ` Christian Brauner
2026-01-07 2:28 ` Gao Xiang
2026-01-07 2:47 ` Al Viro
2026-01-07 2:55 ` Gao Xiang
2026-01-07 10:52 ` Christian Brauner
2026-01-07 16:33 ` Colin Walters
2026-01-08 11:02 ` Christian Brauner
2026-01-25 20:47 ` Askar Safin
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