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Message-Id: <1523282044-22075-2-git-send-email-s.mesoraca16@gmail.com>
Date: Mon, 9 Apr 2018 15:53:59 +0200
From: Salvatore Mesoraca <s.mesoraca16@...il.com>
To: linux-kernel@...r.kernel.org
Cc: kernel-hardening@...ts.openwall.com,
linux-crypto@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
Herbert Xu <herbert@...dor.apana.org.au>,
Kees Cook <keescook@...omium.org>,
Salvatore Mesoraca <s.mesoraca16@...il.com>,
Eric Biggers <ebiggers3@...il.com>,
Laura Abbott <labbott@...hat.com>
Subject: [PATCH 1/6] crypto: api - laying macros for statically allocated buffers
Creating 2 new compile-time constants for internal use,
in preparation for the removal of VLAs[1] from crypto code.
All ciphers implemented in Linux have a block size less than or
equal to 16 bytes and the most demanding hw require 16 bytes
alignment for the block buffer.
[1] http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Signed-off-by: Salvatore Mesoraca <s.mesoraca16@...il.com>
---
crypto/internal.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/crypto/internal.h b/crypto/internal.h
index 9a3f399..89ae41e 100644
--- a/crypto/internal.h
+++ b/crypto/internal.h
@@ -26,6 +26,14 @@
#include <linux/rwsem.h>
#include <linux/slab.h>
+/*
+ * Maximum values for blocksize and alignmask, used to allocate
+ * static buffers that are big enough for any combination of
+ * ciphers and architectures.
+ */
+#define MAX_BLOCKSIZE 16
+#define MAX_ALIGNMASK 15
+
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,
--
1.9.1
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