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ipv4: Don't do expensive useless work during inetdev destroy (CVE-2016-3156)

This commit is contained in:
Ben Hutchings 2016-04-13 21:24:19 +01:00
parent 3f1372dedd
commit e01d7b854c
3 changed files with 96 additions and 0 deletions
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1
debian/changelog vendored
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@ -237,6 +237,7 @@ linux (4.5.1-1) UNRELEASED; urgency=medium
* netfilter: x_tables: Fix parsing of IPT_SO_SET_REPLACE blobs (CVE-2016-3134)
- validate e->target_offset early
- make sure e->next_offset covers remaining blob size
* ipv4: Don't do expensive useless work during inetdev destroy (CVE-2016-3156)
[ Aurelien Jarno ]
* [mipsel/mips/config.loongson-2f] Disable VIDEO_CX23885, VIDEO_IVTV,

94
debian/patches/bugfix/all/ipv4-don-t-do-expensive-useless-work-during-inetdev-.patch vendored Normal file
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@ -0,0 +1,94 @@
From: "David S. Miller" <davem@davemloft.net>
Date: Sun, 13 Mar 2016 23:28:00 -0400
Subject: ipv4: Don't do expensive useless work during inetdev destroy.
Origin: https://git.kernel.org/linus/fbd40ea0180a2d328c5adc61414dc8bab9335ce2
When an inetdev is destroyed, every address assigned to the interface
is removed. And in this scenerio we do two pointless things which can
be very expensive if the number of assigned interfaces is large:
1) Address promotion. We are deleting all addresses, so there is no
point in doing this.
2) A full nf conntrack table purge for every address. We only need to
do this once, as is already caught by the existing
masq_dev_notifier so masq_inet_event() can skip this.
Reported-by: Solar Designer <solar@openwall.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Cyrill Gorcunov <gorcunov@openvz.org>
---
net/ipv4/devinet.c | 4 ++++
net/ipv4/fib_frontend.c | 4 ++++
net/ipv4/netfilter/nf_nat_masquerade_ipv4.c | 12 ++++++++++--
3 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 65e76a48382c..e333bc86bd39 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -334,6 +334,9 @@ static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
ASSERT_RTNL();
+ if (in_dev->dead)
+ goto no_promotions;
+
/* 1. Deleting primary ifaddr forces deletion all secondaries
* unless alias promotion is set
**/
@@ -380,6 +383,7 @@ static void __inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
fib_del_ifaddr(ifa, ifa1);
}
+no_promotions:
/* 2. Unlink it */
*ifap = ifa1->ifa_next;
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 473447593060..21add552e56a 100644
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -922,6 +922,9 @@ void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
subnet = 1;
}
+ if (in_dev->dead)
+ goto no_promotions;
+
/* Deletion is more complicated than add.
* We should take care of not to delete too much :-)
*
@@ -997,6 +1000,7 @@ void fib_del_ifaddr(struct in_ifaddr *ifa, struct in_ifaddr *iprim)
}
}
+no_promotions:
if (!(ok & BRD_OK))
fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim);
if (subnet && ifa->ifa_prefixlen < 31) {
diff --git a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
index c6eb42100e9a..ea91058b5f6f 100644
--- a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
+++ b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c
@@ -108,10 +108,18 @@ static int masq_inet_event(struct notifier_block *this,
unsigned long event,
void *ptr)
{
- struct net_device *dev = ((struct in_ifaddr *)ptr)->ifa_dev->dev;
+ struct in_device *idev = ((struct in_ifaddr *)ptr)->ifa_dev;
struct netdev_notifier_info info;
- netdev_notifier_info_init(&info, dev);
+ /* The masq_dev_notifier will catch the case of the device going
+ * down. So if the inetdev is dead and being destroyed we have
+ * no work to do. Otherwise this is an individual address removal
+ * and we have to perform the flush.
+ */
+ if (idev->dead)
+ return NOTIFY_DONE;
+
+ netdev_notifier_info_init(&info, idev->dev);
return masq_device_event(this, event, &info);
}

1
debian/patches/series vendored
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@ -140,3 +140,4 @@ bugfix/all/tools-lib-traceevent-fix-use-of-uninitialized-variables.patch
bugfix/all/scripts-fix-x.509-pem-support-in-sign-file.patch
bugfix/all/netfilter-x_tables-validate-e-target_offset-early.patch
bugfix/all/netfilter-x_tables-make-sure-e-next_offset-covers-re.patch
bugfix/all/ipv4-don-t-do-expensive-useless-work-during-inetdev-.patch