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install: Explicitly label .ostree.cfs #577

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Jun 4, 2024
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install: Explicitly label .ostree.cfs #577

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9 changes: 9 additions & 0 deletions lib/src/install.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -52,6 +52,8 @@ const BOOT: &str = "boot";
const RUN_BOOTC: &str = "/run/bootc";
/// This is an ext4 special directory we need to ignore.
const LOST_AND_FOUND: &str = "lost+found";
/// The filename of the composefs EROFS superblock; TODO move this into ostree
const OSTREE_COMPOSEFS_SUPER: &str = ".ostree.cfs";
/// The mount path for selinux
#[cfg(feature = "install")]
const SELINUXFS: &str = "/sys/fs/selinux";
Expand Down Expand Up @@ -684,6 +686,13 @@ async fn initialize_ostree_root_from_self(
)
.with_context(|| format!("Recursive SELinux relabeling of {d}"))?;
}

if let Some(cfs_super) = root.open_optional(OSTREE_COMPOSEFS_SUPER)? {
let label = crate::lsm::require_label(policy, "/usr".into(), 0o644)?;
crate::lsm::set_security_selinux(cfs_super.as_fd(), label.as_bytes())?;
} else {
tracing::warn!("Missing {OSTREE_COMPOSEFS_SUPER}; composefs is not enabled?");
}
}

// Write the entry for /boot to /etc/fstab. TODO: Encourage OSes to use the karg?
Expand Down
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