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openvswitch: fix CVE-2020-35498 limitation in the OVS packet parsing

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Upstream-Status: Backport 0625dc79ae

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
This commit is contained in:
Hitendra Prajapati 2024-05-09 17:48:24 +05:30 committed by Bruce Ashfield
parent 35c723774e
commit 77af3345cb
2 changed files with 152 additions and 0 deletions
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151
recipes-networking/openvswitch/openvswitch-git/CVE-2020-35498.patch Normal file
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@ -0,0 +1,151 @@
rom 0625dc79aec73b966f206e55655a2816696246d0 Mon Sep 17 00:00:00 2001
From: Flavio Leitner <fbl@sysclose.org>
Date: Mon, 26 Oct 2020 16:03:19 -0300
Subject: [PATCH] flow: Support extra padding length.
Although not required, padding can be optionally added until
the packet length is MTU bytes. A packet with extra padding
currently fails sanity checks.
Vulnerability: CVE-2020-35498
Fixes: fa8d9001a624 ("miniflow_extract: Properly handle small IP packets.")
Reported-by: Joakim Hindersson <joakim.hindersson@elastx.se>
Acked-by: Ilya Maximets <i.maximets@ovn.org>
Signed-off-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Upstream-Status: Backport [https://github.com/openvswitch/ovs/commit/0625dc79aec73b966f206e55655a2816696246d0]
CVE: CVE-2020-35498
Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
---
lib/conntrack.c | 2 +-
lib/dp-packet.h | 10 +++++-----
lib/flow.c | 6 +++---
tests/classifier.at | 36 ++++++++++++++++++++++++++++++++++++
4 files changed, 45 insertions(+), 9 deletions(-)
diff --git a/lib/conntrack.c b/lib/conntrack.c
index ff5a89457..0f486d74c 100644
--- a/lib/conntrack.c
+++ b/lib/conntrack.c
@@ -813,7 +813,7 @@ static void
reverse_nat_packet(struct dp_packet *pkt, const struct conn *conn)
{
char *tail = dp_packet_tail(pkt);
- uint8_t pad = dp_packet_l2_pad_size(pkt);
+ uint16_t pad = dp_packet_l2_pad_size(pkt);
struct conn_key inner_key;
const char *inner_l4 = NULL;
uint16_t orig_l3_ofs = pkt->l3_ofs;
diff --git a/lib/dp-packet.h b/lib/dp-packet.h
index 9f8991faa..45655af46 100644
--- a/lib/dp-packet.h
+++ b/lib/dp-packet.h
@@ -81,7 +81,7 @@ struct dp_packet {
/* All the following elements of this struct are copied in a single call
* of memcpy in dp_packet_clone_with_headroom. */
- uint8_t l2_pad_size; /* Detected l2 padding size.
+ uint16_t l2_pad_size; /* Detected l2 padding size.
* Padding is non-pullable. */
uint16_t l2_5_ofs; /* MPLS label stack offset, or UINT16_MAX */
uint16_t l3_ofs; /* Network-level header offset,
@@ -118,8 +118,8 @@ void *dp_packet_resize_l2(struct dp_packet *, int increment);
void *dp_packet_resize_l2_5(struct dp_packet *, int increment);
static inline void *dp_packet_eth(const struct dp_packet *);
static inline void dp_packet_reset_offsets(struct dp_packet *);
-static inline uint8_t dp_packet_l2_pad_size(const struct dp_packet *);
-static inline void dp_packet_set_l2_pad_size(struct dp_packet *, uint8_t);
+static inline uint16_t dp_packet_l2_pad_size(const struct dp_packet *);
+static inline void dp_packet_set_l2_pad_size(struct dp_packet *, uint16_t);
static inline void *dp_packet_l2_5(const struct dp_packet *);
static inline void dp_packet_set_l2_5(struct dp_packet *, void *);
static inline void *dp_packet_l3(const struct dp_packet *);
@@ -327,14 +327,14 @@ dp_packet_reset_offsets(struct dp_packet *b)
b->l4_ofs = UINT16_MAX;
}
-static inline uint8_t
+static inline uint16_t
dp_packet_l2_pad_size(const struct dp_packet *b)
{
return b->l2_pad_size;
}
static inline void
-dp_packet_set_l2_pad_size(struct dp_packet *b, uint8_t pad_size)
+dp_packet_set_l2_pad_size(struct dp_packet *b, uint16_t pad_size)
{
ovs_assert(pad_size <= dp_packet_size(b));
b->l2_pad_size = pad_size;
diff --git a/lib/flow.c b/lib/flow.c
index 45bb96b54..353d5cd3e 100644
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -655,7 +655,7 @@ ipv4_sanity_check(const struct ip_header *nh, size_t size,
tot_len = ntohs(nh->ip_tot_len);
if (OVS_UNLIKELY(tot_len > size || ip_len > tot_len ||
- size - tot_len > UINT8_MAX)) {
+ size - tot_len > UINT16_MAX)) {
return false;
}
@@ -693,8 +693,8 @@ ipv6_sanity_check(const struct ovs_16aligned_ip6_hdr *nh, size_t size)
if (OVS_UNLIKELY(plen + IPV6_HEADER_LEN > size)) {
return false;
}
- /* Jumbo Payload option not supported yet. */
- if (OVS_UNLIKELY(size - (plen + IPV6_HEADER_LEN) > UINT8_MAX)) {
+
+ if (OVS_UNLIKELY(size - (plen + IPV6_HEADER_LEN) > UINT16_MAX)) {
return false;
}
diff --git a/tests/classifier.at b/tests/classifier.at
index 88818618b..cdcd72c15 100644
--- a/tests/classifier.at
+++ b/tests/classifier.at
@@ -304,3 +304,39 @@ ovs-ofctl: "conjunction" actions may be used along with "note" but not any other
])
OVS_VSWITCHD_STOP
AT_CLEANUP
+
+# Flow classifier a packet with excess of padding.
+AT_SETUP([flow classifier - packet with extra padding])
+OVS_VSWITCHD_START
+add_of_ports br0 1 2
+AT_DATA([flows.txt], [dnl
+priority=5,ip,ip_dst=1.1.1.1,actions=1
+priority=5,ip,ip_dst=1.1.1.2,actions=2
+priority=0,actions=drop
+])
+AT_CHECK([ovs-ofctl add-flows br0 flows.txt])
+packet=00020202020000010101010008004500001c00010000401176cc01010101010101020d6a00350008ee3a
+AT_CHECK([ovs-appctl ofproto/trace br0 in_port=1 $packet] , [0], [stdout])
+AT_CHECK([tail -2 stdout], [0],
+ [Megaflow: recirc_id=0,eth,ip,in_port=1,nw_dst=1.1.1.2,nw_frag=no
+Datapath actions: 2
+])
+# normal packet plus 255 bytes of padding (8bit padding).
+# 255 * 2 = 510
+padding=$(printf '%*s' 510 | tr ' ' '0')
+AT_CHECK([ovs-appctl ofproto/trace br0 in_port=1 ${packet}${padding}] , [0], [stdout])
+AT_CHECK([tail -2 stdout], [0],
+ [Megaflow: recirc_id=0,eth,ip,in_port=1,nw_dst=1.1.1.2,nw_frag=no
+Datapath actions: 2
+])
+# normal packet plus padding up to 65535 bytes of length (16bit limit).
+# 65535 - 43 = 65492
+# 65492 * 2 = 130984
+padding=$(printf '%*s' 130984 | tr ' ' '0')
+AT_CHECK([ovs-appctl ofproto/trace br0 in_port=1 ${packet}${padding}], [0], [stdout])
+AT_CHECK([tail -2 stdout], [0],
+ [Megaflow: recirc_id=0,eth,ip,in_port=1,nw_dst=1.1.1.2,nw_frag=no
+Datapath actions: 2
+])
+OVS_VSWITCHD_STOP
+AT_CLEANUP
--
2.25.1

1
recipes-networking/openvswitch/openvswitch_git.bb
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@ -32,6 +32,7 @@ SRC_URI = "file://openvswitch-switch \
file://systemd-update-tool-paths.patch \
file://systemd-create-runtime-dirs.patch \
file://CVE-2021-3905.patch \
file://CVE-2020-35498.patch \
"
LIC_FILES_CHKSUM = "file://LICENSE;md5=1ce5d23a6429dff345518758f13aaeab"