The default netlink message size limit might be exceeded when dumping a
lot of algorithms to userspace. As a result, not all of the instantiated
algorithms dumped to userspace. So calculate an upper bound on the message
size and call netlink_dump_start() with that value.
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
---
crypto/crypto_user.c | 8 +++++++-
include/linux/cryptouser.h | 3 +++
2 files changed, 10 insertions(+), 1 deletions(-)
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 38534aa..7fca04c 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -456,11 +456,17 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if ((type == (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE) &&
(nlh->nlmsg_flags & NLM_F_DUMP))) {
+ struct crypto_alg *alg;
+ u16 dump_alloc = 0;
+
if (link->dump == NULL)
return -EINVAL;
+ list_for_each_entry(alg, &crypto_alg_list, cra_list)
+ dump_alloc += CRYPTO_REPORT_MAXSIZE;
+
return netlink_dump_start(crypto_nlsk, skb, nlh,
- link->dump, link->done, 0);
+ link->dump, link->done, dump_alloc);
}
err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
diff --git a/include/linux/cryptouser.h b/include/linux/cryptouser.h
index 532fb58..4abf2ea 100644
--- a/include/linux/cryptouser.h
+++ b/include/linux/cryptouser.h
@@ -100,3 +100,6 @@ struct crypto_report_rng {
char type[CRYPTO_MAX_NAME];
unsigned int seedsize;
};
+
+#define CRYPTO_REPORT_MAXSIZE (sizeof(struct crypto_user_alg) + \
+ sizeof(struct crypto_report_blkcipher))
--
1.7.0.4
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