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Commit 7ae9f23c authored by Eric Paris's avatar Eric Paris
Browse files

selinux: rework security_netlbl_secattr_to_sid 



security_netlbl_secattr_to_sid is difficult to follow, especially the
return codes.  Try to make the function obvious.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 4b02b524

security/selinux/ss/services.c

+21 −21
Original line number Diff line number Diff line
@@ -3041,7 +3041,7 @@ static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, 
int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,

				   u32 *sid)

{

	int rc = -EIDRM;

	int rc;

	struct context *ctx;

	struct context ctx_new;
@@ -3052,16 +3052,15 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 


	read_lock(&policy_rwlock);



	if (secattr->flags & NETLBL_SECATTR_CACHE) {

	if (secattr->flags & NETLBL_SECATTR_CACHE)

		*sid = *(u32 *)secattr->cache->data;

		rc = 0;

	} else if (secattr->flags & NETLBL_SECATTR_SECID) {

	else if (secattr->flags & NETLBL_SECATTR_SECID)

		*sid = secattr->attr.secid;

		rc = 0;

	} else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {

	else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) {

		rc = -EIDRM;

		ctx = sidtab_search(&sidtab, SECINITSID_NETMSG);

		if (ctx == NULL)

			goto netlbl_secattr_to_sid_return;

			goto out;



		context_init(&ctx_new);

		ctx_new.user = ctx->user;
@@ -3069,34 +3068,35 @@ int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 
		ctx_new.type = ctx->type;

		mls_import_netlbl_lvl(&ctx_new, secattr);

		if (secattr->flags & NETLBL_SECATTR_MLS_CAT) {

			if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat,

						  secattr->attr.mls.cat) != 0)

				goto netlbl_secattr_to_sid_return;

			rc = ebitmap_netlbl_import(&ctx_new.range.level[0].cat,

						   secattr->attr.mls.cat);

			if (rc)

				goto out;

			memcpy(&ctx_new.range.level[1].cat,

			       &ctx_new.range.level[0].cat,

			       sizeof(ctx_new.range.level[0].cat));

		}

		if (mls_context_isvalid(&policydb, &ctx_new) != 1)

			goto netlbl_secattr_to_sid_return_cleanup;

		rc = -EIDRM;

		if (!mls_context_isvalid(&policydb, &ctx_new))

			goto out_free;



		rc = sidtab_context_to_sid(&sidtab, &ctx_new, sid);

		if (rc != 0)

			goto netlbl_secattr_to_sid_return_cleanup;

		if (rc)

			goto out_free;



		security_netlbl_cache_add(secattr, *sid);



		ebitmap_destroy(&ctx_new.range.level[0].cat);

	} else {

	} else

		*sid = SECSID_NULL;

		rc = 0;

	}



netlbl_secattr_to_sid_return:

	read_unlock(&policy_rwlock);

	return rc;

netlbl_secattr_to_sid_return_cleanup:

	return 0;

out_free:

	ebitmap_destroy(&ctx_new.range.level[0].cat);

	goto netlbl_secattr_to_sid_return;

out:

	read_unlock(&policy_rwlock);

	return rc;

}



/**