Commit c8e22261 authored May 28, 2020 by Jonathan Lebon Committed by Paul Moore Jun 23, 2020

selinux: allow reading labels before policy is loaded

This patch does for `getxattr` what commit 3e3e24b4 ("selinux: allow
labeling before policy is loaded") did for `setxattr`; it allows
querying the current SELinux label on disk before the policy is loaded.

One of the motivations described in that commit message also drives this
patch: for Fedora CoreOS (and eventually RHEL CoreOS), we want to be
able to move the root filesystem for example, from xfs to ext4 on RAID,
on first boot, at initrd time.[1]

Because such an operation works at the filesystem level, we need to be
able to read the SELinux labels first from the original root, and apply
them to the files of the new root. The previous commit enabled the
second part of this process; this commit enables the first part.

[1] https://github.com/coreos/fedora-coreos-tracker/issues/94



Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Jonathan Lebon <jlebon@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

parent b3a9e3b9

security/selinux/hooks.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -3332,7 +3332,12 @@ static int selinux_inode_getsecurity(struct inode inode, const char name, void
		char *context = NULL;
		struct inode_security_struct *isec;

		if (strcmp(name, XATTR_SELINUX_SUFFIX))
		/*
		* If we're not initialized yet, then we can't validate contexts, so
		* just let vfs_getxattr fall back to using the on-disk xattr.
		*/
		if (!selinux_initialized(&selinux_state) \|\|
		strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;

		/*

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