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authorDavid Howells <dhowells@redhat.com>2016-09-02 22:39:45 +0100
committerDavid Howells <dhowells@redhat.com>2016-09-04 21:41:39 +0100
commit5f2d9c44389e7cd9fe192570f6f20199bc861eb8 (patch)
tree1339480e8cf3b2efaa3f1543e7504e3eb0602408 /net/rxrpc/af_rxrpc.c
parentaf338a9ea60acc6337fe9fcdcf664aec2520e541 (diff)
downloadop-kernel-dev-5f2d9c44389e7cd9fe192570f6f20199bc861eb8.zip
op-kernel-dev-5f2d9c44389e7cd9fe192570f6f20199bc861eb8.tar.gz
rxrpc: Randomise epoch and starting client conn ID values
Create a random epoch value rather than a time-based one on startup and set the top bit to indicate that this is the case. Also create a random starting client connection ID value. This will be incremented from here as new client connections are created. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'net/rxrpc/af_rxrpc.c')
-rw-r--r--net/rxrpc/af_rxrpc.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 32d5449..b66a9e6 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -16,6 +16,7 @@
#include <linux/net.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
+#include <linux/random.h>
#include <linux/poll.h>
#include <linux/proc_fs.h>
#include <linux/key-type.h>
@@ -700,7 +701,13 @@ static int __init af_rxrpc_init(void)
BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb));
- rxrpc_epoch = get_seconds();
+ get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch));
+ rxrpc_epoch |= RXRPC_RANDOM_EPOCH;
+ get_random_bytes(&rxrpc_client_conn_ids.cur,
+ sizeof(rxrpc_client_conn_ids.cur));
+ rxrpc_client_conn_ids.cur &= 0x3fffffff;
+ if (rxrpc_client_conn_ids.cur == 0)
+ rxrpc_client_conn_ids.cur = 1;
ret = -ENOMEM;
rxrpc_call_jar = kmem_cache_create(
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