linux-kernel - [PATCH 4.19 32/49] xfrm: clone XFRMA_SEC_CTX in xfrm_do

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Message-Id: <20201012132630.930225878@linuxfoundation.org>
Date:   Mon, 12 Oct 2020 15:27:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Antony Antony <antony.antony@...unet.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 32/49] xfrm: clone XFRMA_SEC_CTX in xfrm_do_migrate

From: Antony Antony <antony.antony@...unet.com>

[ Upstream commit 7aa05d304785204703a67a6aa7f1db402889a172 ]

XFRMA_SEC_CTX was not cloned from the old to the new.
Migrate this attribute during XFRMA_MSG_MIGRATE

v1->v2:
 - return -ENOMEM on error
v2->v3:
 - fix return type to int

Fixes: 80c9abaabf42 ("[XFRM]: Extension for dynamic update of endpoint address(es)")
Signed-off-by: Antony Antony <antony.antony@...unet.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/xfrm/xfrm_state.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index d76b019673aa0..c2640875ec757 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1341,6 +1341,30 @@ out:
 EXPORT_SYMBOL(xfrm_state_add);
 
 #ifdef CONFIG_XFRM_MIGRATE
+static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
+{
+	struct xfrm_user_sec_ctx *uctx;
+	int size = sizeof(*uctx) + security->ctx_len;
+	int err;
+
+	uctx = kmalloc(size, GFP_KERNEL);
+	if (!uctx)
+		return -ENOMEM;
+
+	uctx->exttype = XFRMA_SEC_CTX;
+	uctx->len = size;
+	uctx->ctx_doi = security->ctx_doi;
+	uctx->ctx_alg = security->ctx_alg;
+	uctx->ctx_len = security->ctx_len;
+	memcpy(uctx + 1, security->ctx_str, security->ctx_len);
+	err = security_xfrm_state_alloc(x, uctx);
+	kfree(uctx);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
 					   struct xfrm_encap_tmpl *encap)
 {
@@ -1397,6 +1421,10 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
 			goto error;
 	}
 
+	if (orig->security)
+		if (clone_security(x, orig->security))
+			goto error;
+
 	if (orig->coaddr) {
 		x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
 				    GFP_KERNEL);
-- 
2.25.1