linux-kernel - [PATCH 3.16 06/47] xfrm: Fix xfrm sel prefix length validation

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Message-ID: <lsq.1572026582.828367920@decadent.org.uk>
Date:   Fri, 25 Oct 2019 19:03:07 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Anirudh Gupta" <anirudhrudr@...il.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>,
        "Steffen Klassert" <steffen.klassert@...unet.com>,
        "Anirudh Gupta" <anirudh.gupta@...hos.com>
Subject: [PATCH 3.16 06/47] xfrm: Fix xfrm sel prefix length validation

3.16.76-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Anirudh Gupta <anirudhrudr@...il.com>

commit b38ff4075a80b4da5cb2202d7965332ca0efb213 upstream.

Family of src/dst can be different from family of selector src/dst.
Use xfrm selector family to validate address prefix length,
while verifying new sa from userspace.

Validated patch with this command:
ip xfrm state add src 1.1.6.1 dst 1.1.6.2 proto esp spi 4260196 \
reqid 20004 mode tunnel aead "rfc4106(gcm(aes))" \
0x1111016400000000000000000000000044440001 128 \
sel src 1011:1:4::2/128 sel dst 1021:1:4::2/128 dev Port5

Fixes: 07bf7908950a ("xfrm: Validate address prefix lengths in the xfrm selector.")
Signed-off-by: Anirudh Gupta <anirudh.gupta@...hos.com>
Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/xfrm/xfrm_user.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -150,6 +150,22 @@ static int verify_newsa_info(struct xfrm
 	err = -EINVAL;
 	switch (p->family) {
 	case AF_INET:
+		break;
+
+	case AF_INET6:
+#if IS_ENABLED(CONFIG_IPV6)
+		break;
+#else
+		err = -EAFNOSUPPORT;
+		goto out;
+#endif
+
+	default:
+		goto out;
+	}
+
+	switch (p->sel.family) {
+	case AF_INET:
 		if (p->sel.prefixlen_d > 32 || p->sel.prefixlen_s > 32)
 			goto out;