Patch "netfilter: xt_u32: validate user space input" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    netfilter: xt_u32: validate user space input

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-xt_u32-validate-user-space-input.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 69c5d284f67089b4750d28ff6ac6f52ec224b330 Mon Sep 17 00:00:00 2001
From: Wander Lairson Costa <wander@xxxxxxxxxx>
Date: Mon, 28 Aug 2023 10:21:07 -0300
Subject: netfilter: xt_u32: validate user space input

From: Wander Lairson Costa <wander@xxxxxxxxxx>

commit 69c5d284f67089b4750d28ff6ac6f52ec224b330 upstream.

The xt_u32 module doesn't validate the fields in the xt_u32 structure.
An attacker may take advantage of this to trigger an OOB read by setting
the size fields with a value beyond the arrays boundaries.

Add a checkentry function to validate the structure.

This was originally reported by the ZDI project (ZDI-CAN-18408).

Fixes: 1b50b8a371e9 ("[NETFILTER]: Add u32 match")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wander Lairson Costa <wander@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/netfilter/xt_u32.c |   21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

--- a/net/netfilter/xt_u32.c
+++ b/net/netfilter/xt_u32.c
@@ -96,11 +96,32 @@ static bool u32_mt(const struct sk_buff
 	return ret ^ data->invert;
 }
 
+static int u32_mt_checkentry(const struct xt_mtchk_param *par)
+{
+	const struct xt_u32 *data = par->matchinfo;
+	const struct xt_u32_test *ct;
+	unsigned int i;
+
+	if (data->ntests > ARRAY_SIZE(data->tests))
+		return -EINVAL;
+
+	for (i = 0; i < data->ntests; ++i) {
+		ct = &data->tests[i];
+
+		if (ct->nnums > ARRAY_SIZE(ct->location) ||
+		    ct->nvalues > ARRAY_SIZE(ct->value))
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 static struct xt_match xt_u32_mt_reg __read_mostly = {
 	.name       = "u32",
 	.revision   = 0,
 	.family     = NFPROTO_UNSPEC,
 	.match      = u32_mt,
+	.checkentry = u32_mt_checkentry,
 	.matchsize  = sizeof(struct xt_u32),
 	.me         = THIS_MODULE,
 };


Patches currently in stable-queue which might be from wander@xxxxxxxxxx are

queue-5.15/netfilter-xt_sctp-validate-the-flag_info-count.patch
queue-5.15/netfilter-xt_u32-validate-user-space-input.patch



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