From 576ee5dfd459abe8e29bee8b204cd259e60b4e18 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Mon, 12 Jan 2026 16:47:10 +0100 Subject: fs: add immutable rootfs Currently pivot_root() doesn't work on the real rootfs because it cannot be unmounted. Userspace has to do a recursive removal of the initramfs contents manually before continuing the boot. Really all we want from the real rootfs is to serve as the parent mount for anything that is actually useful such as the tmpfs or ramfs for initramfs unpacking or the rootfs itself. There's no need for the real rootfs to actually be anything meaningful or useful. Add a immutable rootfs called "nullfs" that can be selected via the "nullfs_rootfs" kernel command line option. The kernel will mount a tmpfs/ramfs on top of it, unpack the initramfs and fire up userspace which mounts the rootfs and can then just do: chdir(rootfs); pivot_root(".", "."); umount2(".", MNT_DETACH); and be done with it. (Ofc, userspace can also choose to retain the initramfs contents by using something like pivot_root(".", "/initramfs") without unmounting it.) Technically this also means that the rootfs mount in unprivileged namespaces doesn't need to become MNT_LOCKED anymore as it's guaranteed that the immutable rootfs remains permanently empty so there cannot be anything revealed by unmounting the covering mount. In the future this will also allow us to create completely empty mount namespaces without risking to leak anything. systemd already handles this all correctly as it tries to pivot_root() first and falls back to MS_MOVE only when that fails. This goes back to various discussion in previous years and a LPC 2024 presentation about this very topic. Link: https://patch.msgid.link/20260112-work-immutable-rootfs-v2-3-88dd1c34a204@kernel.org Signed-off-by: Christian Brauner --- init/do_mounts.c | 14 ++++++++++++++ init/do_mounts.h | 1 + 2 files changed, 15 insertions(+) (limited to 'init') diff --git a/init/do_mounts.c b/init/do_mounts.c index defbbf1d55f7..675397c8a7a4 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -492,6 +492,20 @@ void __init prepare_namespace(void) mount_root(saved_root_name); out: devtmpfs_mount(); + + if (nullfs_rootfs) { + if (init_pivot_root(".", ".")) { + pr_err("VFS: Failed to pivot into new rootfs\n"); + return; + } + if (init_umount(".", MNT_DETACH)) { + pr_err("VFS: Failed to unmount old rootfs\n"); + return; + } + pr_info("VFS: Pivoted into new rootfs\n"); + return; + } + init_mount(".", "/", NULL, MS_MOVE, NULL); init_chroot("."); } diff --git a/init/do_mounts.h b/init/do_mounts.h index 6069ea3eb80d..fbfee810aa89 100644 --- a/init/do_mounts.h +++ b/init/do_mounts.h @@ -15,6 +15,7 @@ void mount_root_generic(char *name, char *pretty_name, int flags); void mount_root(char *root_device_name); extern int root_mountflags; +extern bool nullfs_rootfs; static inline __init int create_dev(char *name, dev_t dev) { -- cgit v1.2.3