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authorEric Biggers <ebiggers@google.com>2017-12-11 12:15:17 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-10 09:27:09 +0100
commit869994e0bd2911ed07169e11362c479e4c98fd78 (patch)
tree86382557470106ed072419167655a260f4642a8b /crypto
parent0b72e17dde6e2468dfed6ce2a558bc2fc806cd2f (diff)
crypto: chacha20poly1305 - validate the digest size
commit e57121d08c38dabec15cf3e1e2ad46721af30cae upstream. If the rfc7539 template was instantiated with a hash algorithm with digest size larger than 16 bytes (POLY1305_DIGEST_SIZE), then the digest overran the 'tag' buffer in 'struct chachapoly_req_ctx', corrupting the subsequent memory, including 'cryptlen'. This caused a crash during crypto_skcipher_decrypt(). Fix it by, when instantiating the template, requiring that the underlying hash algorithm has the digest size expected for Poly1305. Reproducer: #include <linux/if_alg.h> #include <sys/socket.h> #include <unistd.h> int main() { int algfd, reqfd; struct sockaddr_alg addr = { .salg_type = "aead", .salg_name = "rfc7539(chacha20,sha256)", }; unsigned char buf[32] = { 0 }; algfd = socket(AF_ALG, SOCK_SEQPACKET, 0); bind(algfd, (void *)&addr, sizeof(addr)); setsockopt(algfd, SOL_ALG, ALG_SET_KEY, buf, sizeof(buf)); reqfd = accept(algfd, 0, 0); write(reqfd, buf, 16); read(reqfd, buf, 16); } Reported-by: syzbot <syzkaller@googlegroups.com> Fixes: 71ebc4d1b27d ("crypto: chacha20poly1305 - Add a ChaCha20-Poly1305 AEAD construction, RFC7539") Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/chacha20poly1305.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/crypto/chacha20poly1305.c b/crypto/chacha20poly1305.c
index 99c3cce01290..0214600ba071 100644
--- a/crypto/chacha20poly1305.c
+++ b/crypto/chacha20poly1305.c
@@ -600,6 +600,11 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
CRYPTO_ALG_TYPE_AHASH_MASK);
if (IS_ERR(poly))
return PTR_ERR(poly);
+ poly_hash = __crypto_hash_alg_common(poly);
+
+ err = -EINVAL;
+ if (poly_hash->digestsize != POLY1305_DIGEST_SIZE)
+ goto out_put_poly;
err = -ENOMEM;
inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
@@ -608,7 +613,6 @@ static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
ctx = aead_instance_ctx(inst);
ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize;
- poly_hash = __crypto_hash_alg_common(poly);
err = crypto_init_ahash_spawn(&ctx->poly, poly_hash,
aead_crypto_instance(inst));
if (err)