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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: 3b5cf20cf4 ("sunrpc: Use skcipher and ahash/shash")
Reported-by: J. Bruce Fields <bfields@fieldses.org>
Tested-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-04-03 12:37:15 +08:00
parent 9735a22799
commit ef609c238a
2 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/sunrpc/auth_gss/gss_krb5_crypto.c
View File

@ -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);

3
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -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);