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crypto: user - ensure user supplied strings are nul-terminated 

To avoid misuse, ensure cru_name and cru_driver_name are always
nul-terminated strings.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mathias Krause 2013-02-05 18:19:15 +01:00 committed by Herbert Xu
parent e336ed9647
commit 8fd61d3422
1 changed files with 14 additions and 0 deletions
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14
crypto/crypto_user.c
View File

@ -30,6 +30,8 @@
#include "internal.h"
#define null_terminated(x) (strnlen(x, sizeof(x)) < sizeof(x))
static DEFINE_MUTEX(crypto_cfg_mutex);
/* The crypto netlink socket */
@ -196,6 +198,9 @@ static int crypto_report(struct sk_buff *in_skb, struct nlmsghdr *in_nlh,
struct crypto_dump_info info;
int err;
if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
return -EINVAL;
if (!p->cru_driver_name[0])
return -EINVAL;
@ -260,6 +265,9 @@ static int crypto_update_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
LIST_HEAD(list);
if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
return -EINVAL;
if (priority && !strlen(p->cru_driver_name))
return -EINVAL;
@ -287,6 +295,9 @@ static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct crypto_alg *alg;
struct crypto_user_alg *p = nlmsg_data(nlh);
if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
return -EINVAL;
alg = crypto_alg_match(p, 1);
if (!alg)
return -ENOENT;
@ -368,6 +379,9 @@ static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
struct crypto_user_alg *p = nlmsg_data(nlh);
struct nlattr *priority = attrs[CRYPTOCFGA_PRIORITY_VAL];
if (!null_terminated(p->cru_name) || !null_terminated(p->cru_driver_name))
return -EINVAL;
if (strlen(p->cru_driver_name))
exact = 1;