On Sat, Apr 02, 2016 at 11:59:00PM -0400, J. Bruce Fields wrote:
>
> Thanks. It's getting further now, but appears to be freezing later.
> Possibly unrelated. I'm travelling, and it'll be Monday or Wednesday
> till I can take another look.
Thanks for the update. I've found another bug in the hash conversion
that causes memory corruption which may lead to your hang.
Here's a patch with the previous fix plus the new hash fixes.
---8<---
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 <bfields@xxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index d94a8e1..da26455 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 71341cc..6542749 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);
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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