This is a note to let you know that I've just added the patch titled
rtnetlink: Warn when interface's information won't fit in our packet
to the 3.4-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:
rtnetlink-warn-when-interface-s-information-won-t-fit-in-our-packet.patch
and it can be found in the queue-3.4 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 Wed May 28 20:24:34 PDT 2014
From: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 24 Apr 2014 10:22:35 +1000
Subject: rtnetlink: Warn when interface's information won't fit in our packet
From: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
[ Upstream commit 973462bbde79bb827824c73b59027a0aed5c9ca6 ]
Without IFLA_EXT_MASK specified, the information reported for a single
interface in response to RTM_GETLINK is expected to fit within a netlink
packet of NLMSG_GOODSIZE.
If it doesn't, however, things will go badly wrong, When listing all
interfaces, netlink_dump() will incorrectly treat -EMSGSIZE on the first
message in a packet as the end of the listing and omit information for
that interface and all subsequent ones. This can cause getifaddrs(3) to
enter an infinite loop.
This patch won't fix the problem, but it will WARN_ON() making it easier to
track down what's going wrong.
Signed-off-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Jiri Pirko <jpirko@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/core/rtnetlink.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1059,6 +1059,7 @@ static int rtnl_dump_ifinfo(struct sk_bu
struct hlist_node *node;
struct nlattr *tb[IFLA_MAX+1];
u32 ext_filter_mask = 0;
+ int err;
s_h = cb->args[0];
s_idx = cb->args[1];
@@ -1079,11 +1080,17 @@ static int rtnl_dump_ifinfo(struct sk_bu
hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
if (idx < s_idx)
goto cont;
- if (rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
- NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq, 0,
- NLM_F_MULTI,
- ext_filter_mask) <= 0)
+ err = rtnl_fill_ifinfo(skb, dev, RTM_NEWLINK,
+ NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, 0,
+ NLM_F_MULTI,
+ ext_filter_mask);
+ /* If we ran out of room on the first message,
+ * we're in trouble
+ */
+ WARN_ON((err == -EMSGSIZE) && (skb->len == 0));
+
+ if (err <= 0)
goto out;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
Patches currently in stable-queue which might be from david@xxxxxxxxxxxxxxxxxxxxx are
queue-3.4/rtnetlink-only-supply-ifla_vf_ports-information-when-rtext_filter_vf-is-set.patch
queue-3.4/rtnetlink-warn-when-interface-s-information-won-t-fit-in-our-packet.patch
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