From: Eric Biggers <ebiggers@xxxxxxxxxx>
commit a208fa8f33031b9e0aba44c7d1b7e68eb0cbd29e upstream.
[Please apply to 4.9-stable.]
We need to consistently enforce that keyed hashes cannot be used without
setting the key. To do this we need a reliable way to determine whether
a given hash algorithm is keyed or not. AF_ALG currently does this by
checking for the presence of a ->setkey() method. However, this is
actually slightly broken because the CRC-32 algorithms implement
->setkey() but can also be used without a key. (The CRC-32 "key" is not
actually a cryptographic key but rather represents the initial state.
If not overridden, then a default initial state is used.)
Prepare to fix this by introducing a flag CRYPTO_ALG_OPTIONAL_KEY which
indicates that the algorithm has a ->setkey() method, but it is not
required to be called. Then set it on all the CRC-32 algorithms.
The same also applies to the Adler-32 implementation in Lustre.
Also, the cryptd and mcryptd templates have to pass through the flag
from their underlying algorithm.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/crypto/crc32-arm64.c | 2 ++
arch/powerpc/crypto/crc32c-vpmsum_glue.c | 1 +
arch/s390/crypto/crc32-vx.c | 3 +++
arch/sparc/crypto/crc32c_glue.c | 1 +
arch/x86/crypto/crc32-pclmul_glue.c | 1 +
arch/x86/crypto/crc32c-intel_glue.c | 1 +
crypto/crc32_generic.c | 1 +
crypto/crc32c_generic.c | 1 +
crypto/cryptd.c | 7 +++----
crypto/mcryptd.c | 7 +++----
drivers/crypto/bfin_crc.c | 3 ++-
.../staging/lustre/lnet/libcfs/linux/linux-crypto-adler.c | 1 +
include/linux/crypto.h | 6 ++++++
13 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/crypto/crc32-arm64.c b/arch/arm64/crypto/crc32-arm64.c
index 6a37c3c6b11d..3ec568afd1d3 100644
--- a/arch/arm64/crypto/crc32-arm64.c
+++ b/arch/arm64/crypto/crc32-arm64.c
@@ -232,6 +232,7 @@ static struct shash_alg crc32_alg = {
.cra_name = "crc32",
.cra_driver_name = "crc32-arm64-hw",
.cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_alignmask = 0,
.cra_ctxsize = sizeof(struct chksum_ctx),
@@ -253,6 +254,7 @@ static struct shash_alg crc32c_alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-arm64-hw",
.cra_priority = 300,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_alignmask = 0,
.cra_ctxsize = sizeof(struct chksum_ctx),
diff --git a/arch/powerpc/crypto/crc32c-vpmsum_glue.c b/arch/powerpc/crypto/crc32c-vpmsum_glue.c
index f058e0c3e4d4..fd1d6c83f0c0 100644
--- a/arch/powerpc/crypto/crc32c-vpmsum_glue.c
+++ b/arch/powerpc/crypto/crc32c-vpmsum_glue.c
@@ -141,6 +141,7 @@ static struct shash_alg alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-vpmsum",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/arch/s390/crypto/crc32-vx.c b/arch/s390/crypto/crc32-vx.c
index 992e630c227b..6f4985f357c6 100644
--- a/arch/s390/crypto/crc32-vx.c
+++ b/arch/s390/crypto/crc32-vx.c
@@ -238,6 +238,7 @@ static struct shash_alg crc32_vx_algs[] = {
.cra_name = "crc32",
.cra_driver_name = "crc32-vx",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CRC32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crc_ctx),
.cra_module = THIS_MODULE,
@@ -258,6 +259,7 @@ static struct shash_alg crc32_vx_algs[] = {
.cra_name = "crc32be",
.cra_driver_name = "crc32be-vx",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CRC32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crc_ctx),
.cra_module = THIS_MODULE,
@@ -278,6 +280,7 @@ static struct shash_alg crc32_vx_algs[] = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-vx",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CRC32_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crc_ctx),
.cra_module = THIS_MODULE,
diff --git a/arch/sparc/crypto/crc32c_glue.c b/arch/sparc/crypto/crc32c_glue.c
index d1064e46efe8..8aa664638c3c 100644
--- a/arch/sparc/crypto/crc32c_glue.c
+++ b/arch/sparc/crypto/crc32c_glue.c
@@ -133,6 +133,7 @@ static struct shash_alg alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-sparc64",
.cra_priority = SPARC_CR_OPCODE_PRIORITY,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_alignmask = 7,
diff --git a/arch/x86/crypto/crc32-pclmul_glue.c b/arch/x86/crypto/crc32-pclmul_glue.c
index 27226df3f7d8..c8d9cdacbf10 100644
--- a/arch/x86/crypto/crc32-pclmul_glue.c
+++ b/arch/x86/crypto/crc32-pclmul_glue.c
@@ -162,6 +162,7 @@ static struct shash_alg alg = {
.cra_name = "crc32",
.cra_driver_name = "crc32-pclmul",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/arch/x86/crypto/crc32c-intel_glue.c b/arch/x86/crypto/crc32c-intel_glue.c
index 0857b1a1de3b..60a391b8c4a2 100644
--- a/arch/x86/crypto/crc32c-intel_glue.c
+++ b/arch/x86/crypto/crc32c-intel_glue.c
@@ -239,6 +239,7 @@ static struct shash_alg alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-intel",
.cra_priority = 200,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/crypto/crc32_generic.c b/crypto/crc32_generic.c
index aa2a25fc7482..718cbce8d169 100644
--- a/crypto/crc32_generic.c
+++ b/crypto/crc32_generic.c
@@ -133,6 +133,7 @@ static struct shash_alg alg = {
.cra_name = "crc32",
.cra_driver_name = "crc32-generic",
.cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/crypto/crc32c_generic.c b/crypto/crc32c_generic.c
index 4c0a0e271876..372320399622 100644
--- a/crypto/crc32c_generic.c
+++ b/crypto/crc32c_generic.c
@@ -146,6 +146,7 @@ static struct shash_alg alg = {
.cra_name = "crc32c",
.cra_driver_name = "crc32c-generic",
.cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_alignmask = 3,
.cra_ctxsize = sizeof(struct chksum_ctx),
diff --git a/crypto/cryptd.c b/crypto/cryptd.c
index af9ad45d1909..9b66ce7e728d 100644
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -673,10 +673,9 @@ static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
if (err)
goto out_free_inst;
- type = CRYPTO_ALG_ASYNC;
- if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
- type |= CRYPTO_ALG_INTERNAL;
- inst->alg.halg.base.cra_flags = type;
+ inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
+ (alg->cra_flags & (CRYPTO_ALG_INTERNAL |
+ CRYPTO_ALG_OPTIONAL_KEY));
inst->alg.halg.digestsize = salg->digestsize;
inst->alg.halg.statesize = salg->statesize;
diff --git a/crypto/mcryptd.c b/crypto/mcryptd.c
index 6e9389c8bfbd..7406ed0745be 100644
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -516,10 +516,9 @@ static int mcryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
if (err)
goto out_free_inst;
- type = CRYPTO_ALG_ASYNC;
- if (alg->cra_flags & CRYPTO_ALG_INTERNAL)
- type |= CRYPTO_ALG_INTERNAL;
- inst->alg.halg.base.cra_flags = type;
+ inst->alg.halg.base.cra_flags = CRYPTO_ALG_ASYNC |
+ (alg->cra_flags & (CRYPTO_ALG_INTERNAL |
+ CRYPTO_ALG_OPTIONAL_KEY));
inst->alg.halg.digestsize = halg->digestsize;
inst->alg.halg.statesize = halg->statesize;
diff --git a/drivers/crypto/bfin_crc.c b/drivers/crypto/bfin_crc.c
index 10db7df366c8..2ee11802992f 100644
--- a/drivers/crypto/bfin_crc.c
+++ b/drivers/crypto/bfin_crc.c
@@ -494,7 +494,8 @@ static struct ahash_alg algs = {
.cra_driver_name = DRIVER_NAME,
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_AHASH |
- CRYPTO_ALG_ASYNC,
+ CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct bfin_crypto_crc_ctx),
.cra_alignmask = 3,
diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto-adler.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto-adler.c
index db0572733712..ab30a0f5129c 100644
--- a/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto-adler.c
+++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-crypto-adler.c
@@ -119,6 +119,7 @@ static struct shash_alg alg = {
.cra_name = "adler32",
.cra_driver_name = "adler32-zlib",
.cra_priority = 100,
+ .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
.cra_blocksize = CHKSUM_BLOCK_SIZE,
.cra_ctxsize = sizeof(u32),
.cra_module = THIS_MODULE,
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 7cee5551625b..b0175fa29860 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -102,6 +102,12 @@
*/
#define CRYPTO_ALG_INTERNAL 0x00002000
+/*
+ * Set if the algorithm has a ->setkey() method but can be used without
+ * calling it first, i.e. there is a default key.
+ */
+#define CRYPTO_ALG_OPTIONAL_KEY 0x00004000
+
/*
* Transform masks and values (for crt_flags).
*/
--
2.16.1.291.g4437f3f132-goog
