crypto: drbg - Fix drbg_max_addtl() on 64-bit kernels

On 64-bit kernels, drbg_max_addtl() returns 2**35 bytes.  That's too
large, for two reasons:

1. SP800-90A says the maximum limit is 2**35 *bits*, not 2**35 bytes.
   So the implemented limit has confused bits and bytes.

2. When drbg_kcapi_hash() calls crypto_shash_update() on the additional
   information string, the length is implicitly cast to 'unsigned int'.
   That truncates the additional information string to U32_MAX bytes.

Fix the maximum additional information string length to always be
U32_MAX - 1, causing an error to be returned for any longer lengths.

Fixes: 541af946fe13 ("crypto: drbg - SP800-90A Deterministic Random Bit Generator")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 7 insertions, 11 deletions

diff --git a/include/crypto/drbg.h b/include/crypto/drbg.h
index 2d42518cbdce..c11eaf757ed0 100644
--- a/include/crypto/drbg.h
+++ b/include/crypto/drbg.h
@@ -148,19 +148,15 @@ static inline size_t drbg_max_request_bytes(struct drbg_state *drbg)
 	return (1 << 16);
 }
 
+/*
+ * SP800-90A allows implementations to support additional info / personalization
+ * strings of up to 2**35 bits.  Implementations can have a smaller maximum.  We
+ * use 2**35 - 16 bits == U32_MAX - 1 bytes so that the max + 1 always fits in a
+ * size_t, allowing drbg_healthcheck_sanity() to verify its enforcement.
+ */
 static inline size_t drbg_max_addtl(struct drbg_state *drbg)
 {
-	/* SP800-90A requires 2**35 bytes additional info str / pers str */
-#if (__BITS_PER_LONG == 32)
-	/*
-	 * SP800-90A allows smaller maximum numbers to be returned -- we
-	 * return SIZE_MAX - 1 to allow the verification of the enforcement
-	 * of this value in drbg_healthcheck_sanity.
-	 */
-	return (SIZE_MAX - 1);
-#else
-	return (1UL<<35);
-#endif
+	return U32_MAX - 1;
 }
 
 static inline size_t drbg_max_requests(struct drbg_state *drbg)