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kernel/SOURCES/1204-net-sched-flower-fix-possible-OOB-write-in-fl_set_ge.patch

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From 68e161867609dafcee1a20343990547a8da9be83 Mon Sep 17 00:00:00 2001
From: Nagappan Ramasamy Palaniappan <nagappan.ramasamy.palaniappan@oracle.com>
Date: Wed, 2 Aug 2023 13:10:03 +0000
Subject: [PATCH 5/5] net/sched: flower: fix possible OOB write
in-fl_set_geneve_opt()
CVE: CVE-2023-35788
commit 4d56304e5827c8cc8cc18c75343d283af7c4825c
Author: Hangyu Hua <hbh25y@gmail.com>
Date: Wed May 31 18:28:04 2023 +0800
net/sched: flower: fix possible OOB write in fl_set_geneve_opt()
If we send two TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets and their total
size is 252 bytes(key->enc_opts.len = 252) then
key->enc_opts.len = opt->length = data_len / 4 = 0 when the third
TCA_FLOWER_KEY_ENC_OPTS_GENEVE packet enters fl_set_geneve_opt. This
bypasses the next bounds check and results in an out-of-bounds.
Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options")
Signed-off-by: Hangyu Hua <hbh25y@gmail.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Link: https://lore.kernel.org/r/20230531102805.27090-1-hbh25y@gmail.com
Signed-off-by: Nagappan Ramasamy Palaniappan <nagappan.ramasamy.palaniappan@oracle.com>
Reviewed-by: Laurence Rochfort <laurence.rochfort@oracle.com>
---
net/sched/cls_flower.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 041d63ff8..65b68bf36 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1145,6 +1145,9 @@ static int fl_set_geneve_opt(const struct nlattr *nla, struct fl_flow_key *key,
if (option_len > sizeof(struct geneve_opt))
data_len = option_len - sizeof(struct geneve_opt);
+ if (key->enc_opts.len > FLOW_DIS_TUN_OPTS_MAX - 4)
+ return -ERANGE;
+
opt = (struct geneve_opt *)&key->enc_opts.data[key->enc_opts.len];
memset(opt, 0xff, option_len);
opt->length = data_len / 4;
--
2.31.1