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From: Joel Savitz <jsavitz@redhat.com>
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Subject: [KPATCH 7.9] netfilter: x_tables: kpatch fixes for CVE-2021-22555
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Date: Wed, 28 Jul 2021 12:03:15 -0400
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Kernels:
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3.10.0-1160.el7
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3.10.0-1160.2.1.el7
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3.10.0-1160.2.2.el7
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3.10.0-1160.6.1.el7
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3.10.0-1160.11.1.el7
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3.10.0-1160.15.2.el7
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3.10.0-1160.21.1.el7
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3.10.0-1160.24.1.el7
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3.10.0-1160.25.1.el7
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3.10.0-1160.31.1.el7
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3.10.0-1160.36.2.el7
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Changes since last build:
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arches: x86_64 ppc64le
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arp_tables.o: changed function: translate_compat_table
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ip6_tables.o: changed function: translate_compat_table
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ip_tables.o: changed function: translate_compat_table
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x_tables.o: changed function: xt_compat_match_from_user
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x_tables.o: changed function: xt_compat_target_from_user
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---------------------------
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Kernels:
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3.10.0-1160.el7
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3.10.0-1160.2.1.el7
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3.10.0-1160.2.2.el7
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3.10.0-1160.6.1.el7
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3.10.0-1160.11.1.el7
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3.10.0-1160.15.2.el7
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3.10.0-1160.21.1.el7
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3.10.0-1160.24.1.el7
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3.10.0-1160.25.1.el7
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3.10.0-1160.31.1.el7
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3.10.0-1160.36.2.el7
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Modifications: none
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Z-MR: https://gitlab.com/redhat/rhel/src/kernel/rhel-7/-/merge_requests/201
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KT0 test PASS: https://beaker.engineering.redhat.com/jobs/5642298
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for scratch build: https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=38448253
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commit 06215319786b979bed0f5eb3138de0506db9d39f
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Author: Florian Westphal <fwestpha@redhat.com>
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Date: Fri Jul 9 11:42:55 2021 +0200
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netfilter: x_tables: fix compat match/target pad out-of-bound write
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1980489
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Upstream Status: commit b29c457a65114
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CVE: CVE-2021-22555
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commit b29c457a6511435960115c0f548c4360d5f4801d
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Author: Florian Westphal <fw@strlen.de>
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Date: Wed Apr 7 21:38:57 2021 +0200
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netfilter: x_tables: fix compat match/target pad out-of-bound write
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xt_compat_match/target_from_user doesn't check that zeroing the area
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to start of next rule won't write past end of allocated ruleset blob.
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Remove this code and zero the entire blob beforehand.
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Reported-by: syzbot+cfc0247ac173f597aaaa@syzkaller.appspotmail.com
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Reported-by: Andy Nguyen <theflow@google.com>
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Fixes: 9fa492cdc160c ("[NETFILTER]: x_tables: simplify compat API")
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Signed-off-by: Florian Westphal <fw@strlen.de>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Florian Westphal <fwestpha@redhat.com>
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Signed-off-by: Joel Savitz <jsavitz@redhat.com>
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Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
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Acked-by: Artem Savkov <asavkov@redhat.com>
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Acked-by: Yannick Cote <ycote@redhat.com>
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---
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net/ipv4/netfilter/arp_tables.c | 2 ++
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net/ipv4/netfilter/ip_tables.c | 2 ++
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net/ipv6/netfilter/ip6_tables.c | 2 ++
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net/netfilter/x_tables.c | 10 ++--------
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4 files changed, 8 insertions(+), 8 deletions(-)
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diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
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index 602d92697038..66ad3b4e194c 100644
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--- a/net/ipv4/netfilter/arp_tables.c
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+++ b/net/ipv4/netfilter/arp_tables.c
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@@ -1364,6 +1364,8 @@ static int translate_compat_table(struct xt_table_info **pinfo,
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if (!newinfo)
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goto out_unlock;
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+ memset(newinfo->entries, 0, size);
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+
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newinfo->number = compatr->num_entries;
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for (i = 0; i < NF_ARP_NUMHOOKS; i++) {
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newinfo->hook_entry[i] = info->hook_entry[i];
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diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
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index 3559f7ffa430..d9de653be67e 100644
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--- a/net/ipv4/netfilter/ip_tables.c
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+++ b/net/ipv4/netfilter/ip_tables.c
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@@ -1622,6 +1622,8 @@ translate_compat_table(struct net *net,
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if (!newinfo)
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goto out_unlock;
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+ memset(newinfo->entries, 0, size);
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+
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newinfo->number = compatr->num_entries;
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for (i = 0; i < NF_INET_NUMHOOKS; i++) {
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newinfo->hook_entry[i] = compatr->hook_entry[i];
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diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
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index 1772a1797e79..d112bfc86aac 100644
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--- a/net/ipv6/netfilter/ip6_tables.c
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+++ b/net/ipv6/netfilter/ip6_tables.c
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@@ -1626,6 +1626,8 @@ translate_compat_table(struct net *net,
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if (!newinfo)
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goto out_unlock;
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+ memset(newinfo->entries, 0, size);
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+
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newinfo->number = compatr->num_entries;
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for (i = 0; i < NF_INET_NUMHOOKS; i++) {
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newinfo->hook_entry[i] = compatr->hook_entry[i];
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diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
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index 76e40ff48b10..affd08ce7df8 100644
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--- a/net/netfilter/x_tables.c
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+++ b/net/netfilter/x_tables.c
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@@ -564,7 +564,7 @@ void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
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{
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const struct xt_match *match = m->u.kernel.match;
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struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
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- int pad, off = xt_compat_match_offset(match);
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+ int off = xt_compat_match_offset(match);
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u_int16_t msize = cm->u.user.match_size;
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char name[sizeof(m->u.user.name)];
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@@ -574,9 +574,6 @@ void xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
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match->compat_from_user(m->data, cm->data);
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else
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memcpy(m->data, cm->data, msize - sizeof(*cm));
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- pad = XT_ALIGN(match->matchsize) - match->matchsize;
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- if (pad > 0)
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- memset(m->data + match->matchsize, 0, pad);
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msize += off;
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m->u.user.match_size = msize;
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@@ -913,7 +910,7 @@ void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
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{
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const struct xt_target *target = t->u.kernel.target;
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struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t;
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- int pad, off = xt_compat_target_offset(target);
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+ int off = xt_compat_target_offset(target);
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u_int16_t tsize = ct->u.user.target_size;
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char name[sizeof(t->u.user.name)];
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@@ -923,9 +920,6 @@ void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
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target->compat_from_user(t->data, ct->data);
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else
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memcpy(t->data, ct->data, tsize - sizeof(*ct));
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- pad = XT_ALIGN(target->targetsize) - target->targetsize;
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- if (pad > 0)
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- memset(t->data + target->targetsize, 0, pad);
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tsize += off;
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t->u.user.target_size = tsize;
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--
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2.27.0
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