* Patch "netfilter: add back stackpointer size checks" has been added to the 4.4-stable tree
@ 2018-03-13 11:15 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2018-03-13 11:15 UTC (permalink / raw)
To: fw, gregkh, pablo; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
netfilter: add back stackpointer size checks
to the 4.4-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:
netfilter-add-back-stackpointer-size-checks.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 57ebd808a97d7c5b1e1afb937c2db22beba3c1f8 Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Wed, 7 Feb 2018 13:46:25 +0100
Subject: netfilter: add back stackpointer size checks
From: Florian Westphal <fw@strlen.de>
commit 57ebd808a97d7c5b1e1afb937c2db22beba3c1f8 upstream.
The rationale for removing the check is only correct for rulesets
generated by ip(6)tables.
In iptables, a jump can only occur to a user-defined chain, i.e.
because we size the stack based on number of user-defined chains we
cannot exceed stack size.
However, the underlying binary format has no such restriction,
and the validation step only ensures that the jump target is a
valid rule start point.
IOW, its possible to build a rule blob that has no user-defined
chains but does contain a jump.
If this happens, no jump stack gets allocated and crash occurs
because no jumpstack was allocated.
Fixes: 7814b6ec6d0d6 ("netfilter: xtables: don't save/restore jumpstack offset")
Reported-by: syzbot+e783f671527912cd9403@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv4/netfilter/arp_tables.c | 4 ++++
net/ipv4/netfilter/ip_tables.c | 4 ++++
net/ipv6/netfilter/ip6_tables.c | 4 ++++
3 files changed, 12 insertions(+)
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -329,6 +329,10 @@ unsigned int arpt_do_table(struct sk_buf
}
if (table_base + v
!= arpt_next_entry(e)) {
+ if (unlikely(stackidx >= private->stacksize)) {
+ verdict = NF_DROP;
+ break;
+ }
jumpstack[stackidx++] = e;
}
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -408,6 +408,10 @@ ipt_do_table(struct sk_buff *skb,
}
if (table_base + v != ipt_next_entry(e) &&
!(e->ip.flags & IPT_F_GOTO)) {
+ if (unlikely(stackidx >= private->stacksize)) {
+ verdict = NF_DROP;
+ break;
+ }
jumpstack[stackidx++] = e;
pr_debug("Pushed %p into pos %u\n",
e, stackidx - 1);
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -425,6 +425,10 @@ ip6t_do_table(struct sk_buff *skb,
}
if (table_base + v != ip6t_next_entry(e) &&
!(e->ipv6.flags & IP6T_F_GOTO)) {
+ if (unlikely(stackidx >= private->stacksize)) {
+ verdict = NF_DROP;
+ break;
+ }
jumpstack[stackidx++] = e;
}
Patches currently in stable-queue which might be from fw@strlen.de are
queue-4.4/netfilter-add-back-stackpointer-size-checks.patch
queue-4.4/netfilter-use-skb_to_full_sk-in-ip_route_me_harder.patch
queue-4.4/netfilter-ipv6-fix-use-after-free-write-in-nf_nat_ipv6_manip_pkt.patch
queue-4.4/netfilter-ebtables-config_compat-don-t-trust-userland-offsets.patch
queue-4.4/netfilter-nfnetlink_queue-fix-timestamp-attribute.patch
queue-4.4/netfilter-bridge-ebt_among-add-missing-match-size-checks.patch
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2018-03-13 11:15 Patch "netfilter: add back stackpointer size checks" has been added to the 4.4-stable tree gregkh
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