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openssl: patch to fix devcrypto sessions leak

Applies a patch from openssl/openssl#8213
that fixes an error where open /dev/crypto sessions were not closed.
Thanks to Ansuel Smith for reporting it.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>
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cotequeiroz authored and hauke committed Feb 15, 2019
1 parent eabc1dd commit ddee1825de2a9c472f8bffc9ff3097f6421842a8
Showing with 115 additions and 0 deletions.
  1. +115 −0 package/libs/openssl/patches/300-eng_devcrypto-close-open-session-on-init.patch
@@ -0,0 +1,115 @@
From 82b269fd77d20aa86d0825d798f3045dfe0a7a86 Mon Sep 17 00:00:00 2001
From: Eneas U de Queiroz <cote2004-github@yahoo.com>
Date: Tue, 12 Feb 2019 10:44:19 -0200
Subject: [PATCH] eng_devcrypto: close open session on init

cipher_init may be called on an already initialized context, without a
necessary cleanup. This separates cleanup from initialization, closing
an eventual open session before creating a new one.

Move the /dev/crypto session cleanup code to its own function.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

--- a/crypto/engine/eng_devcrypto.c
+++ b/crypto/engine/eng_devcrypto.c
@@ -35,6 +35,15 @@
*/
static int cfd;

+static int clean_devcrypto_session(struct session_op *sess) {
+ if (ioctl(cfd, CIOCFSESSION, &sess->ses) < 0) {
+ SYSerr(SYS_F_IOCTL, errno);
+ return 0;
+ }
+ memset(sess, 0, sizeof(struct session_op));
+ return 1;
+}
+
/******************************************************************************
*
* Ciphers
@@ -143,7 +152,11 @@ static int cipher_init(EVP_CIPHER_CTX *c
const struct cipher_data_st *cipher_d =
get_cipher_data(EVP_CIPHER_CTX_nid(ctx));

- memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
+ /* cleanup a previous session */
+ if (cipher_ctx->sess.ses != 0 &&
+ clean_devcrypto_session(&cipher_ctx->sess) == 0)
+ return 0;
+
cipher_ctx->sess.cipher = cipher_d->devcryptoid;
cipher_ctx->sess.keylen = cipher_d->keylen;
cipher_ctx->sess.key = (void *)key;
@@ -282,15 +295,29 @@ static int ctr_do_cipher(EVP_CIPHER_CTX

static int cipher_ctrl(EVP_CIPHER_CTX *ctx, int type, int p1, void* p2)
{
+ struct cipher_ctx *cipher_ctx =
+ (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
EVP_CIPHER_CTX *to_ctx = (EVP_CIPHER_CTX *)p2;
- struct cipher_ctx *cipher_ctx;
+ struct cipher_ctx *to_cipher_ctx;
+
+ switch (type) {

- if (type == EVP_CTRL_COPY) {
+ case EVP_CTRL_COPY:
+ if (cipher_ctx == NULL)
+ return 1;
/* when copying the context, a new session needs to be initialized */
- cipher_ctx = (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);
- return (cipher_ctx == NULL)
- || cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
+ to_cipher_ctx =
+ (struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(to_ctx);
+ memset(&to_cipher_ctx->sess, 0, sizeof(to_cipher_ctx->sess));
+ return cipher_init(to_ctx, cipher_ctx->sess.key, EVP_CIPHER_CTX_iv(ctx),
(cipher_ctx->op == COP_ENCRYPT));
+
+ case EVP_CTRL_INIT:
+ memset(&cipher_ctx->sess, 0, sizeof(cipher_ctx->sess));
+ return 1;
+
+ default:
+ break;
}

return -1;
@@ -301,12 +328,7 @@ static int cipher_cleanup(EVP_CIPHER_CTX
struct cipher_ctx *cipher_ctx =
(struct cipher_ctx *)EVP_CIPHER_CTX_get_cipher_data(ctx);

- if (ioctl(cfd, CIOCFSESSION, &cipher_ctx->sess.ses) < 0) {
- SYSerr(SYS_F_IOCTL, errno);
- return 0;
- }
-
- return 1;
+ return clean_devcrypto_session(&cipher_ctx->sess);
}

/*
@@ -352,6 +374,7 @@ static void prepare_cipher_methods(void)
|| !EVP_CIPHER_meth_set_flags(known_cipher_methods[i],
cipher_data[i].flags
| EVP_CIPH_CUSTOM_COPY
+ | EVP_CIPH_CTRL_INIT
| EVP_CIPH_FLAG_DEFAULT_ASN1)
|| !EVP_CIPHER_meth_set_init(known_cipher_methods[i], cipher_init)
|| !EVP_CIPHER_meth_set_do_cipher(known_cipher_methods[i],
@@ -594,11 +617,8 @@ static int digest_cleanup(EVP_MD_CTX *ct

if (digest_ctx == NULL)
return 1;
- if (ioctl(cfd, CIOCFSESSION, &digest_ctx->sess.ses) < 0) {
- SYSerr(SYS_F_IOCTL, errno);
- return 0;
- }
- return 1;
+
+ return clean_devcrypto_session(&digest_ctx->sess);
}

static int devcrypto_test_digest(size_t digest_data_index)

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