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Message-ID: <CAHmME9oGTPS-gVyHQ4o=AxvMJrGH44_tyQ2KPQcfAKgcqC2SnA@mail.gmail.com>
Date: Wed, 19 Jan 2022 13:14:56 +0100
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: Miles Chen <miles.chen@...iatek.com>
Cc: ardb@...nel.org, davem@...emloft.net, gregkh@...uxfoundation.org,
herbert@...dor.apana.org.au, linux-arm-kernel@...ts.infradead.org,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mediatek@...ts.infradead.org, matthias.bgg@...il.com,
nathan@...nel.org, ndesaulniers@...gle.com
Subject: Re: [PATCH] lib/crypto: blake2s: fix a CFI failure
The below kludge of a patch fixes the issue. Still unclear whether we
should go with something like this or get clang fixed or what.
diff --git a/arch/arm/crypto/blake2s-shash.c b/arch/arm/crypto/blake2s-shash.c
index 17c1c3bfe2f5..be8cde5f1719 100644
--- a/arch/arm/crypto/blake2s-shash.c
+++ b/arch/arm/crypto/blake2s-shash.c
@@ -13,12 +13,12 @@
static int crypto_blake2s_update_arm(struct shash_desc *desc,
const u8 *in, unsigned int inlen)
{
- return crypto_blake2s_update(desc, in, inlen, blake2s_compress);
+ return crypto_blake2s_update(desc, in, inlen);
}
static int crypto_blake2s_final_arm(struct shash_desc *desc, u8 *out)
{
- return crypto_blake2s_final(desc, out, blake2s_compress);
+ return crypto_blake2s_final(desc, out);
}
#define BLAKE2S_ALG(name, driver_name, digest_size) \
diff --git a/arch/x86/crypto/blake2s-shash.c b/arch/x86/crypto/blake2s-shash.c
index f9e2fecdb761..c81ffedb4865 100644
--- a/arch/x86/crypto/blake2s-shash.c
+++ b/arch/x86/crypto/blake2s-shash.c
@@ -18,12 +18,12 @@
static int crypto_blake2s_update_x86(struct shash_desc *desc,
const u8 *in, unsigned int inlen)
{
- return crypto_blake2s_update(desc, in, inlen, blake2s_compress);
+ return crypto_blake2s_update(desc, in, inlen);
}
static int crypto_blake2s_final_x86(struct shash_desc *desc, u8 *out)
{
- return crypto_blake2s_final(desc, out, blake2s_compress);
+ return crypto_blake2s_final(desc, out);
}
#define BLAKE2S_ALG(name, driver_name, digest_size) \
diff --git a/crypto/blake2s_generic.c b/crypto/blake2s_generic.c
index 72fe480f9bd6..050874588a84 100644
--- a/crypto/blake2s_generic.c
+++ b/crypto/blake2s_generic.c
@@ -5,6 +5,7 @@
* Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@...c4.com>. All
Rights Reserved.
*/
+#define FORCE_BLAKE2S_GENERIC
#include <crypto/internal/blake2s.h>
#include <crypto/internal/hash.h>
@@ -15,12 +16,12 @@
static int crypto_blake2s_update_generic(struct shash_desc *desc,
const u8 *in, unsigned int inlen)
{
- return crypto_blake2s_update(desc, in, inlen, blake2s_compress_generic);
+ return crypto_blake2s_update(desc, in, inlen);
}
static int crypto_blake2s_final_generic(struct shash_desc *desc, u8 *out)
{
- return crypto_blake2s_final(desc, out, blake2s_compress_generic);
+ return crypto_blake2s_final(desc, out);
}
#define BLAKE2S_ALG(name, driver_name, digest_size) \
diff --git a/include/crypto/internal/blake2s.h
b/include/crypto/internal/blake2s.h
index d39cfa0d333e..fec7eead93fc 100644
--- a/include/crypto/internal/blake2s.h
+++ b/include/crypto/internal/blake2s.h
@@ -24,14 +24,14 @@ static inline void blake2s_set_lastblock(struct
blake2s_state *state)
state->f[0] = -1;
}
-typedef void (*blake2s_compress_t)(struct blake2s_state *state,
- const u8 *block, size_t nblocks, u32 inc);
-
/* Helper functions for BLAKE2s shared by the library and shash APIs */
+#ifdef FORCE_BLAKE2S_GENERIC
+#define blake2s_compress blake2s_compress_generic
+#endif
+
static inline void __blake2s_update(struct blake2s_state *state,
- const u8 *in, size_t inlen,
- blake2s_compress_t compress)
+ const u8 *in, size_t inlen)
{
const size_t fill = BLAKE2S_BLOCK_SIZE - state->buflen;
@@ -39,7 +39,7 @@ static inline void __blake2s_update(struct
blake2s_state *state,
return;
if (inlen > fill) {
memcpy(state->buf + state->buflen, in, fill);
- (*compress)(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
+ blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_SIZE);
state->buflen = 0;
in += fill;
inlen -= fill;
@@ -47,7 +47,7 @@ static inline void __blake2s_update(struct
blake2s_state *state,
if (inlen > BLAKE2S_BLOCK_SIZE) {
const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_SIZE);
/* Hash one less (full) block than strictly possible */
- (*compress)(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
+ blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_SIZE);
in += BLAKE2S_BLOCK_SIZE * (nblocks - 1);
inlen -= BLAKE2S_BLOCK_SIZE * (nblocks - 1);
}
@@ -55,13 +55,12 @@ static inline void __blake2s_update(struct
blake2s_state *state,
state->buflen += inlen;
}
-static inline void __blake2s_final(struct blake2s_state *state, u8 *out,
- blake2s_compress_t compress)
+static inline void __blake2s_final(struct blake2s_state *state, u8 *out)
{
blake2s_set_lastblock(state);
memset(state->buf + state->buflen, 0,
BLAKE2S_BLOCK_SIZE - state->buflen); /* Padding */
- (*compress)(state, state->buf, 1, state->buflen);
+ blake2s_compress(state, state->buf, 1, state->buflen);
cpu_to_le32_array(state->h, ARRAY_SIZE(state->h));
memcpy(out, state->h, state->outlen);
}
@@ -98,21 +97,19 @@ static inline int crypto_blake2s_init(struct
shash_desc *desc)
}
static inline int crypto_blake2s_update(struct shash_desc *desc,
- const u8 *in, unsigned int inlen,
- blake2s_compress_t compress)
+ const u8 *in, unsigned int inlen)
{
struct blake2s_state *state = shash_desc_ctx(desc);
- __blake2s_update(state, in, inlen, compress);
+ __blake2s_update(state, in, inlen);
return 0;
}
-static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out,
- blake2s_compress_t compress)
+static inline int crypto_blake2s_final(struct shash_desc *desc, u8 *out)
{
struct blake2s_state *state = shash_desc_ctx(desc);
- __blake2s_final(state, out, compress);
+ __blake2s_final(state, out);
return 0;
}
diff --git a/lib/crypto/blake2s.c b/lib/crypto/blake2s.c
index 9364f79937b8..a13f01ff53a7 100644
--- a/lib/crypto/blake2s.c
+++ b/lib/crypto/blake2s.c
@@ -18,14 +18,14 @@
void blake2s_update(struct blake2s_state *state, const u8 *in, size_t inlen)
{
- __blake2s_update(state, in, inlen, blake2s_compress);
+ __blake2s_update(state, in, inlen);
}
EXPORT_SYMBOL(blake2s_update);
void blake2s_final(struct blake2s_state *state, u8 *out)
{
WARN_ON(IS_ENABLED(DEBUG) && !out);
- __blake2s_final(state, out, blake2s_compress);
+ __blake2s_final(state, out);
memzero_explicit(state, sizeof(*state));
}
EXPORT_SYMBOL(blake2s_final);
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