apparmor: use SHA-256 library API instead of crypto_shash API

This user of SHA-256 does not support any other algorithm, so the
crypto_shash abstraction provides no value.  Just use the SHA-256
library API instead, which is much simpler and easier to use.

Acked-by: John Johansen <john.johansen@canonical.com>
Link: https://lore.kernel.org/r/20250630174805.59010-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

Author: Eric Biggers

security/apparmor/Kconfig

@@ -59,8 +59,7 @@ config SECURITY_APPARMOR_INTROSPECT_POLICY
 config SECURITY_APPARMOR_HASH
 	bool "Enable introspection of sha256 hashes for loaded profiles"
 	depends on SECURITY_APPARMOR_INTROSPECT_POLICY
-	select CRYPTO
-	select CRYPTO_SHA256
+	select CRYPTO_LIB_SHA256
 	default y
 	help
 	  This option selects whether introspection of loaded policy

security/apparmor/crypto.c

@@ -11,113 +11,52 @@
  * it should be.
  */
 
-#include <crypto/hash.h>
+#include <crypto/sha2.h>
 
 #include "include/apparmor.h"
 #include "include/crypto.h"
 
-static unsigned int apparmor_hash_size;
-
-static struct crypto_shash *apparmor_tfm;
-
 unsigned int aa_hash_size(void)
 {
-	return apparmor_hash_size;
+	return SHA256_DIGEST_SIZE;
 }
 
 char *aa_calc_hash(void *data, size_t len)
 {
-	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
 	char *hash;
-	int error;
-
-	if (!apparmor_tfm)
-		return NULL;
 
-	hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+	hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 	if (!hash)
 		return ERR_PTR(-ENOMEM);
 
-	desc->tfm = apparmor_tfm;
-
-	error = crypto_shash_init(desc);
-	if (error)
-		goto fail;
-	error = crypto_shash_update(desc, (u8 *) data, len);
-	if (error)
-		goto fail;
-	error = crypto_shash_final(desc, hash);
-	if (error)
-		goto fail;
-
+	sha256(data, len, hash);
 	return hash;
-
-fail:
-	kfree(hash);
-
-	return ERR_PTR(error);
 }
 
 int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
 			 size_t len)
 {
-	SHASH_DESC_ON_STACK(desc, apparmor_tfm);
-	int error;
+	struct sha256_ctx sctx;
 	__le32 le32_version = cpu_to_le32(version);
 
 	if (!aa_g_hash_policy)
 		return 0;
 
-	if (!apparmor_tfm)
-		return 0;
-
-	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);
+	profile->hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);
 	if (!profile->hash)
 		return -ENOMEM;
 
-	desc->tfm = apparmor_tfm;
-
-	error = crypto_shash_init(desc);
-	if (error)
-		goto fail;
-	error = crypto_shash_update(desc, (u8 *) &le32_version, 4);
-	if (error)
-		goto fail;
-	error = crypto_shash_update(desc, (u8 *) start, len);
-	if (error)
-		goto fail;
-	error = crypto_shash_final(desc, profile->hash);
-	if (error)
-		goto fail;
-
+	sha256_init(&sctx);
+	sha256_update(&sctx, (u8 *)&le32_version, 4);
+	sha256_update(&sctx, (u8 *)start, len);
+	sha256_final(&sctx, profile->hash);
 	return 0;
-
-fail:
-	kfree(profile->hash);
-	profile->hash = NULL;
-
-	return error;
 }
 
 static int __init init_profile_hash(void)
 {
-	struct crypto_shash *tfm;
-
-	if (!apparmor_initialized)
-		return 0;
-
-	tfm = crypto_alloc_shash("sha256", 0, 0);
-	if (IS_ERR(tfm)) {
-		int error = PTR_ERR(tfm);
-		AA_ERROR("failed to setup profile sha256 hashing: %d\n", error);
-		return error;
-	}
-	apparmor_tfm = tfm;
-	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm);
-
-	aa_info_message("AppArmor sha256 policy hashing enabled");
-
+	if (apparmor_initialized)
+		aa_info_message("AppArmor sha256 policy hashing enabled");
 	return 0;
 }
-
 late_initcall(init_profile_hash);