This is a note to let you know that I've just added the patch titled
inet_diag: fix possible overflow in inet_diag_dump_one_icsk()
to the 3.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
inet_diag-fix-possible-overflow-in-inet_diag_dump_one_icsk.patch
and it can be found in the queue-3.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Tue Mar 24 11:00:07 CET 2015
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Fri, 13 Mar 2015 09:49:59 -0700
Subject: inet_diag: fix possible overflow in inet_diag_dump_one_icsk()
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit c8e2c80d7ec00d020320f905822bf49c5ad85250 ]
inet_diag_dump_one_icsk() allocates too small skb.
Add inet_sk_attr_size() helper right before inet_sk_diag_fill()
so that it can be updated if/when new attributes are added.
iproute2/ss currently does not use this dump_one() interface,
this might explain nobody noticed this problem yet.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/inet_diag.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -71,6 +71,20 @@ static inline void inet_diag_unlock_hand
mutex_unlock(&inet_diag_table_mutex);
}
+static size_t inet_sk_attr_size(void)
+{
+ return nla_total_size(sizeof(struct tcp_info))
+ + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
+ + nla_total_size(1) /* INET_DIAG_TOS */
+ + nla_total_size(1) /* INET_DIAG_TCLASS */
+ + nla_total_size(sizeof(struct inet_diag_meminfo))
+ + nla_total_size(sizeof(struct inet_diag_msg))
+ + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
+ + nla_total_size(TCP_CA_NAME_MAX)
+ + nla_total_size(sizeof(struct tcpvegas_info))
+ + 64;
+}
+
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
struct sk_buff *skb, struct inet_diag_req_v2 *req,
struct user_namespace *user_ns,
@@ -324,9 +338,7 @@ int inet_diag_dump_one_icsk(struct inet_
if (err)
goto out;
- rep = nlmsg_new(sizeof(struct inet_diag_msg) +
- sizeof(struct inet_diag_meminfo) +
- sizeof(struct tcp_info) + 64, GFP_KERNEL);
+ rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
if (!rep) {
err = -ENOMEM;
goto out;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-3.19/tcp-fix-tcp_cong_avoid_ai-credit-accumulation-bug-with-decreases-in-w.patch
queue-3.19/tcp-fix-tcp-fin-memory-accounting.patch
queue-3.19/tcp-restore-1.5x-per-rtt-limit-to-cubic-cwnd-growth-in-congestion-avoidance.patch
queue-3.19/net_sched-fix-struct-tc_u_hnode-layout-in-u32.patch
queue-3.19/inet_diag-fix-possible-overflow-in-inet_diag_dump_one_icsk.patch
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