Commit 5c73fceb authored Jul 23, 2013 by Stephen Smalley Committed by Eric Paris Jul 25, 2013

SELinux: Enable setting security contexts on rootfs inodes.



rootfs (ramfs) can support setting of security contexts
by userspace due to the vfs fallback behavior of calling
the security module to set the in-core inode state
for security.* attributes when the filesystem does not
provide an xattr handler.  No xattr handler required
as the inodes are pinned in memory and have no backing
store.

This is useful in allowing early userspace to label individual
files within a rootfs while still providing a policy-defined
default via genfs.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

parent a767f680

security/selinux/hooks.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -406,6 +406,13 @@ static int sb_finish_set_opts(struct super_block *sb)
		if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
		sbsec->flags \|= SE_SBLABELSUPP;

		/*
		* Special handling for rootfs. Is genfs but supports
		* setting SELinux context on in-core inodes.
		*/
		if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
		sbsec->flags \|= SE_SBLABELSUPP;

		/* Initialize the root inode. */
		rc = inode_doinit_with_dentry(root_inode, root);

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