netdev - [PATCH 3/3] xfrm: clone XFRMA_SEC_CTX during xfrm_do

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200820181608.GA19772@moon.secunet.de>
Date:   Thu, 20 Aug 2020 20:16:08 +0200
From:   Antony Antony <antony.antony@...unet.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        <netdev@...r.kernel.org>, Herbert Xu <herbert@...dor.apana.org.au>
CC:     Antony Antony <antony@...nome.org>,
        Antony Antony <antony.antony@...unet.com>
Subject: [PATCH 3/3] xfrm: clone XFRMA_SEC_CTX during xfrm_do_migrate

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

Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
 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 20a12c67a931..dbcb71b800b8 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1441,6 +1441,30 @@ int xfrm_state_add(struct xfrm_state *x)
 EXPORT_SYMBOL(xfrm_state_add);
 
 #ifdef CONFIG_XFRM_MIGRATE
+static inline bool 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 true;
+
+	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 true;
+
+	return false;
+}
+
 static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
 					   struct xfrm_encap_tmpl *encap)
 {
@@ -1497,6 +1521,10 @@ 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);
-- 
2.20.1