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Commit 6f0f0fd4 authored by James Morris's avatar James Morris
Browse files

security: remove register_security hook 



The register security hook is no longer required, as the capability
module is always registered.  LSMs wishing to stack capability as
a secondary module should do so explicitly.

Signed-off-by: default avatarJames Morris <jmorris@namei.org>
Acked-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 93cbace7

include/linux/security.h

+0 −10
Original line number Diff line number Diff line
@@ -1239,11 +1239,6 @@ static inline void security_free_mnt_opts(struct security_mnt_opts *opts) 
 *	@pages contains the number of pages.

 *	Return 0 if permission is granted.

 *

 * @register_security:

 *	allow module stacking.

 *	@name contains the name of the security module being stacked.

 *	@ops contains a pointer to the struct security_operations of the module to stack.

 *

 * @secid_to_secctx:

 *	Convert secid to security context.

 *	@secid contains the security ID.
@@ -1471,10 +1466,6 @@ struct security_operations { 
	int (*netlink_send) (struct sock *sk, struct sk_buff *skb);

	int (*netlink_recv) (struct sk_buff *skb, int cap);



	/* allow module stacking */

	int (*register_security) (const char *name,

				  struct security_operations *ops);



	void (*d_instantiate) (struct dentry *dentry, struct inode *inode);



	int (*getprocattr) (struct task_struct *p, char *name, char **value);
@@ -1564,7 +1555,6 @@ struct security_operations { 
extern int security_init(void);

extern int security_module_enable(struct security_operations *ops);

extern int register_security(struct security_operations *ops);

extern int mod_reg_security(const char *name, struct security_operations *ops);

extern struct dentry *securityfs_create_file(const char *name, mode_t mode,

					     struct dentry *parent, void *data,

					     const struct file_operations *fops);

security/capability.c

+0 −7
Original line number Diff line number Diff line
@@ -721,12 +721,6 @@ static int cap_xfrm_decode_session(struct sk_buff *skb, u32 *fl, int ckall) 
}



#endif /* CONFIG_SECURITY_NETWORK_XFRM */

static int cap_register_security(const char *name,

				 struct security_operations *ops)

{

	return -EINVAL;

}



static void cap_d_instantiate(struct dentry *dentry, struct inode *inode)

{

}
@@ -940,7 +934,6 @@ void security_fixup_ops(struct security_operations *ops) 
	set_to_cap_if_null(ops, sem_semop);

	set_to_cap_if_null(ops, netlink_send);

	set_to_cap_if_null(ops, netlink_recv);

	set_to_cap_if_null(ops, register_security);

	set_to_cap_if_null(ops, d_instantiate);

	set_to_cap_if_null(ops, getprocattr);

	set_to_cap_if_null(ops, setprocattr);

security/root_plug.c

+0 −9
Original line number Diff line number Diff line
@@ -28,9 +28,6 @@ 
#include <linux/usb.h>

#include <linux/moduleparam.h>



/* flag to keep track of how we were registered */

static int secondary;



/* default is a generic type of usb to serial converter */

static int vendor_id = 0x0557;

static int product_id = 0x2008;
@@ -97,14 +94,8 @@ static int __init rootplug_init (void) 
	if (register_security (&rootplug_security_ops)) {

		printk (KERN_INFO 

			"Failure registering Root Plug module with the kernel\n");

		/* try registering with primary module */

		if (mod_reg_security (MY_NAME, &rootplug_security_ops)) {

			printk (KERN_INFO "Failure registering Root Plug "

				" module with primary security module.\n");

			return -EINVAL;

	}

		secondary = 1;

	}

	printk (KERN_INFO "Root Plug module initialized, "

		"vendor_id = %4.4x, product id = %4.4x\n", vendor_id, product_id);

	return 0;

security/security.c

+0 −29
Original line number Diff line number Diff line
@@ -125,35 +125,6 @@ int register_security(struct security_operations *ops) 
	return 0;

}



/**

 * mod_reg_security - allows security modules to be "stacked"

 * @name: a pointer to a string with the name of the security_options to be registered

 * @ops: a pointer to the struct security_options that is to be registered

 *

 * This function allows security modules to be stacked if the currently loaded

 * security module allows this to happen.  It passes the @name and @ops to the

 * register_security function of the currently loaded security module.

 *

 * The return value depends on the currently loaded security module, with 0 as

 * success.

 */

int mod_reg_security(const char *name, struct security_operations *ops)

{

	if (verify(ops)) {

		printk(KERN_INFO "%s could not verify "

		       "security operations.\n", __func__);

		return -EINVAL;

	}



	if (ops == security_ops) {

		printk(KERN_INFO "%s security operations "

		       "already registered.\n", __func__);

		return -EINVAL;

	}



	return security_ops->register_security(name, ops);

}



/* Security operations */



int security_ptrace(struct task_struct *parent, struct task_struct *child,

security/selinux/hooks.c

+5 −27
Original line number Diff line number Diff line
@@ -126,13 +126,11 @@ __setup("selinux=", selinux_enabled_setup); 
int selinux_enabled = 1;

#endif



/* Original (dummy) security module. */

static struct security_operations *original_ops;



/* Minimal support for a secondary security module,

   just to allow the use of the dummy or capability modules.

   The owlsm module can alternatively be used as a secondary

   module as long as CONFIG_OWLSM_FD is not enabled. */

/*

 * Minimal support for a secondary security module,

 * just to allow the use of the capability module.

 */

static struct security_operations *secondary_ops;



/* Lists of inode and superblock security structures initialized
@@ -5115,24 +5113,6 @@ static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) 
	*secid = isec->sid;

}



/* module stacking operations */

static int selinux_register_security(const char *name, struct security_operations *ops)

{

	if (secondary_ops != original_ops) {

		printk(KERN_ERR "%s:  There is already a secondary security "

		       "module registered.\n", __func__);

		return -EINVAL;

	}



	secondary_ops = ops;



	printk(KERN_INFO "%s:  Registering secondary module %s\n",

	       __func__,

	       name);



	return 0;

}



static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)

{

	if (inode)
@@ -5517,8 +5497,6 @@ static struct security_operations selinux_ops = { 
	.sem_semctl =			selinux_sem_semctl,

	.sem_semop =			selinux_sem_semop,



	.register_security =		selinux_register_security,



	.d_instantiate =		selinux_d_instantiate,



	.getprocattr =			selinux_getprocattr,
@@ -5612,7 +5590,7 @@ static __init int selinux_init(void) 
					    0, SLAB_PANIC, NULL);

	avc_init();



	original_ops = secondary_ops = security_ops;

	secondary_ops = security_ops;

	if (!secondary_ops)

		panic("SELinux: No initial security operations\n");

	if (register_security(&selinux_ops))