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crypto: user - Add CRYPTO_MSG_DELRNG 

This patch adds a new crypto_user command that allows the admin to
delete the crypto system RNG.  Note that this can only be done if
the RNG is currently not in use.  The next time it is used a new
system RNG will be allocated.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-06-21 19:11:45 +08:00
parent d049752465
commit 9aa867e465
2 changed files with 12 additions and 1 deletions
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12
crypto/crypto_user.c
View File

@ -27,6 +27,7 @@
#include <net/net_namespace.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/internal/rng.h>
#include <crypto/akcipher.h>
#include "internal.h"
@ -472,13 +473,21 @@ static int crypto_add_alg(struct sk_buff *skb, struct nlmsghdr *nlh,
return 0;
}
static int crypto_del_rng(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr **attrs)
{
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
return crypto_del_default_rng();
}
#define MSGSIZE(type) sizeof(struct type)
static const int crypto_msg_min[CRYPTO_NR_MSGTYPES] = {
[CRYPTO_MSG_NEWALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
[CRYPTO_MSG_DELALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
[CRYPTO_MSG_UPDATEALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = MSGSIZE(crypto_user_alg),
[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = 0,
};
static const struct nla_policy crypto_policy[CRYPTOCFGA_MAX+1] = {
@ -498,6 +507,7 @@ static const struct crypto_link {
[CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE] = { .doit = crypto_report,
.dump = crypto_dump_report,
.done = crypto_dump_report_done},
[CRYPTO_MSG_DELRNG - CRYPTO_MSG_BASE] = { .doit = crypto_del_rng },
};
static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)

1
include/uapi/linux/cryptouser.h
View File

@ -25,6 +25,7 @@ enum {
CRYPTO_MSG_DELALG,
CRYPTO_MSG_UPDATEALG,
CRYPTO_MSG_GETALG,
CRYPTO_MSG_DELRNG,
__CRYPTO_MSG_MAX
};
#define CRYPTO_MSG_MAX (__CRYPTO_MSG_MAX - 1)