From ef609c238a8ea163cb0af759cc73c9e2555c89da Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Sun, 3 Apr 2016 12:37:15 +0800 Subject: [PATCH] sunrpc: Fix skcipher/shash conversion The skcpiher/shash conversion introduced a number of bugs in the sunrpc code: 1) Missing calls to skcipher_request_set_tfm lead to crashes. 2) The allocation size of shash_desc is too small which leads to memory corruption. Fixes: 3b5cf20cf439 ("sunrpc: Use skcipher and ahash/shash") Reported-by: J. Bruce Fields Tested-by: J. Bruce Fields Signed-off-by: Herbert Xu --- net/sunrpc/auth_gss/gss_krb5_crypto.c | 8 ++++++-- net/sunrpc/auth_gss/gss_krb5_mech.c | 3 ++- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c index d94a8e1e9f05..da26455cf86c 100644 --- a/net/sunrpc/auth_gss/gss_krb5_crypto.c +++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c @@ -78,6 +78,7 @@ krb5_encrypt( memcpy(out, in, length); sg_init_one(sg, out, length); + skcipher_request_set_tfm(req, tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, sg, sg, length, local_iv); @@ -115,6 +116,7 @@ krb5_decrypt( memcpy(out, in, length); sg_init_one(sg, out, length); + skcipher_request_set_tfm(req, tfm); skcipher_request_set_callback(req, 0, NULL, NULL); skcipher_request_set_crypt(req, sg, sg, length, local_iv); @@ -946,7 +948,8 @@ krb5_rc4_setup_seq_key(struct krb5_ctx *kctx, struct crypto_skcipher *cipher, return PTR_ERR(hmac); } - desc = kmalloc(sizeof(*desc), GFP_KERNEL); + desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac), + GFP_KERNEL); if (!desc) { dprintk("%s: failed to allocate shash descriptor for '%s'\n", __func__, kctx->gk5e->cksum_name); @@ -1012,7 +1015,8 @@ krb5_rc4_setup_enc_key(struct krb5_ctx *kctx, struct crypto_skcipher *cipher, return PTR_ERR(hmac); } - desc = kmalloc(sizeof(*desc), GFP_KERNEL); + desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac), + GFP_KERNEL); if (!desc) { dprintk("%s: failed to allocate shash descriptor for '%s'\n", __func__, kctx->gk5e->cksum_name); diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c index 71341ccb9890..65427492b1c9 100644 --- a/net/sunrpc/auth_gss/gss_krb5_mech.c +++ b/net/sunrpc/auth_gss/gss_krb5_mech.c @@ -451,7 +451,8 @@ context_derive_keys_rc4(struct krb5_ctx *ctx) goto out_err_free_hmac; - desc = kmalloc(sizeof(*desc), GFP_KERNEL); + desc = kmalloc(sizeof(*desc) + crypto_shash_descsize(hmac), + GFP_KERNEL); if (!desc) { dprintk("%s: failed to allocate hash descriptor for '%s'\n", __func__, ctx->gk5e->cksum_name); -- 2.20.1