crypto: api - Move MODULE_ALIAS_CRYPTO to algapi.h

This is part of the low-level API and should not be exposed to
top-level Crypto API users.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 13 insertions, 0 deletions

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index dcc1fd4ef1b4..e28957993b56 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -34,6 +34,19 @@
 
 #define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
 
+/*
+ * Autoloaded crypto modules should only use a prefixed name to avoid allowing
+ * arbitrary modules to be loaded. Loading from userspace may still need the
+ * unprefixed names, so retains those aliases as well.
+ * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
+ * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
+ * expands twice on the same line. Instead, use a separate base name for the
+ * alias.
+ */
+#define MODULE_ALIAS_CRYPTO(name)	\
+		__MODULE_INFO(alias, alias_userspace, name);	\
+		__MODULE_INFO(alias, alias_crypto, "crypto-" name)
+
 struct crypto_aead;
 struct crypto_instance;
 struct module;