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From 6631a62473656c61d7f82cda8ba490c9ba952b96 Mon Sep 17 00:00:00 2001
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From: Joe Lawrence <joe.lawrence@redhat.com>
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Date: Mon, 27 Nov 2023 15:50:24 -0500
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Subject: [KPATCH CVE-2023-42753] kpatch fixes for CVE-2023-42753
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Kernels:
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3.10.0-1160.92.1.el7
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3.10.0-1160.95.1.el7
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3.10.0-1160.99.1.el7
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3.10.0-1160.102.1.el7
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3.10.0-1160.105.1.el7
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Kpatch-MR: https://gitlab.com/redhat/prdsc/rhel/src/kpatch/rhel-7/-/merge_requests/64
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Approved-by: Yannick Cote (@ycote1)
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Changes since last build:
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arches: x86_64 ppc64le
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ip_set_hash_netportnet.o: changed function: hash_netportnet4_uadt
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ip_set_hash_netportnet.o: changed function: hash_netportnet6_uadt
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---------------------------
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Modifications:
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- Z-stream sets IP_SET_HASH_WITH_NET0, which kicks off a bunch of
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preprocessor defined function and data changes, including struct
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hash_netportnet{4,6}.nets[] array sizing and iteration. Instead of
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deploying shadow variables to trace new/old instances, just reject
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CIDR/CIDR2 if they are 0, i.e. remove support for /0 wildcard matching
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so users get an error when they try to insert a new /0 element.
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commit 8de5d63e7ee39b62f71af7cd95990d99d300e8ec
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Author: Phil Sutter <psutter@redhat.com>
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Date: Wed Nov 22 19:24:24 2023 +0100
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netfilter: ipset: add the missing IP_SET_HASH_WITH_NET0 macro for ip_set_hash_netportnet.c
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JIRA: https://issues.redhat.com/browse/RHEL-8433
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Upstream Status: commit 050d91c03b28ca479df13dfb02bcd2c60dd6a878
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CVE: CVE-2023-42753
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commit 050d91c03b28ca479df13dfb02bcd2c60dd6a878
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Author: Kyle Zeng <zengyhkyle@gmail.com>
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Date: Tue Sep 5 15:04:09 2023 -0700
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netfilter: ipset: add the missing IP_SET_HASH_WITH_NET0 macro for ip_set_hash_netportnet.c
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The missing IP_SET_HASH_WITH_NET0 macro in ip_set_hash_netportnet can
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lead to the use of wrong `CIDR_POS(c)` for calculating array offsets,
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which can lead to integer underflow. As a result, it leads to slab
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out-of-bound access.
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This patch adds back the IP_SET_HASH_WITH_NET0 macro to
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ip_set_hash_netportnet to address the issue.
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Fixes: 886503f34d63 ("netfilter: ipset: actually allow allowable CIDR 0 in hash:net,port,net")
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Suggested-by: Jozsef Kadlecsik <kadlec@netfilter.org>
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Signed-off-by: Kyle Zeng <zengyhkyle@gmail.com>
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Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org>
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Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
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---
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net/netfilter/ipset/ip_set_hash_netportnet.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/net/netfilter/ipset/ip_set_hash_netportnet.c b/net/netfilter/ipset/ip_set_hash_netportnet.c
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index 613e18e720a4..57043081d04c 100644
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--- a/net/netfilter/ipset/ip_set_hash_netportnet.c
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+++ b/net/netfilter/ipset/ip_set_hash_netportnet.c
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@@ -213,12 +213,16 @@ hash_netportnet4_uadt(struct ip_set *set, struct nlattr *tb[],
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if (tb[IPSET_ATTR_CIDR]) {
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e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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+ if (e.cidr[0] == 0)
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+ return -IPSET_ERR_INVALID_CIDR;
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if (e.cidr[0] > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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if (tb[IPSET_ATTR_CIDR2]) {
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e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
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+ if (e.cidr[1] == 0)
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+ return -IPSET_ERR_INVALID_CIDR;
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if (e.cidr[1] > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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@@ -493,12 +497,16 @@ hash_netportnet6_uadt(struct ip_set *set, struct nlattr *tb[],
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if (tb[IPSET_ATTR_CIDR]) {
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e.cidr[0] = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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+ if (e.cidr[0] == 0)
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+ return -IPSET_ERR_INVALID_CIDR;
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if (e.cidr[0] > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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if (tb[IPSET_ATTR_CIDR2]) {
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e.cidr[1] = nla_get_u8(tb[IPSET_ATTR_CIDR2]);
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+ if (e.cidr[1] == 0)
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+ return -IPSET_ERR_INVALID_CIDR;
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if (e.cidr[1] > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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--
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2.43.0
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