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