1 files changed, 141 insertions, 7 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 0cdd9a07e043..92e2b804c606 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -7,7 +7,7 @@
  *      Kazunori MIYAZAWA @USAGI
  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  *              IPv6 support
- *      
+ *
  */
 
 #include <linux/module.h>
@@ -88,6 +88,34 @@ static int verify_encap_tmpl(struct rtattr **xfrma)
         return 0;
 }
 
+
+static inline int verify_sec_ctx_len(struct rtattr **xfrma)
+{
+        struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
+        struct xfrm_user_sec_ctx *uctx;
+        int len = 0;
+
+        if (!rt)
+                return 0;
+
+        if (rt->rta_len < sizeof(*uctx))
+                return -EINVAL;
+
+        uctx = RTA_DATA(rt);
+
+        if (uctx->ctx_len > PAGE_SIZE)
+                return -EINVAL;
+
+        len += sizeof(struct xfrm_user_sec_ctx);
+        len += uctx->ctx_len;
+
+        if (uctx->len != len)
+                return -EINVAL;
+
+        return 0;
+}
+
+
 static int verify_newsa_info(struct xfrm_usersa_info *p,
                              struct rtattr **xfrma)
 {
@@ -145,6 +173,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
                 goto out;
         if ((err = verify_encap_tmpl(xfrma)))
                 goto out;
+        if ((err = verify_sec_ctx_len(xfrma)))
+                goto out;
 
         err = -EINVAL;
         switch (p->mode) {
@@ -209,6 +239,30 @@ static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_a
         return 0;
 }
 
+
+static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
+{
+        struct xfrm_sec_ctx *xfrm_ctx = xp->security;
+        int len = 0;
+
+        if (xfrm_ctx) {
+                len += sizeof(struct xfrm_user_sec_ctx);
+                len += xfrm_ctx->ctx_len;
+        }
+        return len;
+}
+
+static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
+{
+        struct xfrm_user_sec_ctx *uctx;
+
+        if (!u_arg)
+                return 0;
+
+        uctx = RTA_DATA(u_arg);
+        return security_xfrm_state_alloc(x, uctx);
+}
+
 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 {
         memcpy(&x->id, &p->id, sizeof(x->id));
@@ -253,6 +307,9 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
         if (err)
                 goto error;
 
+        if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
+                goto error;
+
         x->km.seq = p->seq;
 
         return x;
@@ -272,11 +329,11 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
         int err;
         struct km_event c;
 
-        err = verify_newsa_info(p, (struct rtattr **) xfrma);
+        err = verify_newsa_info(p, (struct rtattr **)xfrma);
         if (err)
                 return err;
 
-        x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
+        x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
         if (!x)
                 return err;
 
@@ -390,6 +447,19 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
         if (x->encap)
                 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
 
+        if (x->security) {
+                int ctx_size = sizeof(struct xfrm_sec_ctx) +
+                                x->security->ctx_len;
+                struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+                struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                uctx->exttype = XFRMA_SEC_CTX;
+                uctx->len = ctx_size;
+                uctx->ctx_doi = x->security->ctx_doi;
+                uctx->ctx_alg = x->security->ctx_alg;
+                uctx->ctx_len = x->security->ctx_len;
+                memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
+        }
         nlh->nlmsg_len = skb->tail - b;
 out:
         sp->this_idx++;
@@ -603,6 +673,18 @@ static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
         return verify_policy_dir(p->dir);
 }
 
+static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
+{
+        struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
+        struct xfrm_user_sec_ctx *uctx;
+
+        if (!rt)
+                return 0;
+
+        uctx = RTA_DATA(rt);
+        return security_xfrm_policy_alloc(pol, uctx);
+}
+
 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
                            int nr)
 {
@@ -681,7 +763,10 @@ static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p,
         }
 
         copy_from_user_policy(xp, p);
-        err = copy_from_user_tmpl(xp, xfrma);
+
+        if (!(err = copy_from_user_tmpl(xp, xfrma)))
+                err = copy_from_user_sec_ctx(xp, xfrma);
+
         if (err) {
                 *errp = err;
                 kfree(xp);
@@ -702,8 +787,11 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
         err = verify_newpolicy_info(p);
         if (err)
                 return err;
+        err = verify_sec_ctx_len((struct rtattr **)xfrma);
+        if (err)
+                return err;
 
-        xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
+        xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
         if (!xp)
                 return err;
 
@@ -761,6 +849,27 @@ rtattr_failure:
         return -1;
 }
 
+static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+        if (xp->security) {
+                int ctx_size = sizeof(struct xfrm_sec_ctx) +
+                                xp->security->ctx_len;
+                struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+                struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                uctx->exttype = XFRMA_SEC_CTX;
+                uctx->len = ctx_size;
+                uctx->ctx_doi = xp->security->ctx_doi;
+                uctx->ctx_alg = xp->security->ctx_alg;
+                uctx->ctx_len = xp->security->ctx_len;
+                memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
+        }
+        return 0;
+
+ rtattr_failure:
+        return -1;
+}
+
 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
 {
         struct xfrm_dump_info *sp = ptr;
@@ -782,6 +891,8 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
         copy_to_user_policy(xp, p, dir);
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
 out:
@@ -852,8 +963,25 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 
         if (p->index)
                 xp = xfrm_policy_byid(p->dir, p->index, delete);
-        else
-                xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
+        else {
+                struct rtattr **rtattrs = (struct rtattr **)xfrma;
+                struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
+                struct xfrm_policy tmp;
+
+                err = verify_sec_ctx_len(rtattrs);
+                if (err)
+                        return err;
+
+                memset(&tmp, 0, sizeof(struct xfrm_policy));
+                if (rt) {
+                        struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                        if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
+                                return err;
+                }
+                xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
+                security_xfrm_policy_free(&tmp);
+        }
         if (xp == NULL)
                 return -ENOENT;
 
@@ -1224,6 +1352,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
 
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
         return skb->len;
@@ -1241,6 +1371,7 @@ static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
 
         len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
         len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
+        len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
         skb = alloc_skb(len, GFP_ATOMIC);
         if (skb == NULL)
                 return -ENOMEM;
@@ -1324,6 +1455,8 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
         copy_to_user_policy(xp, &upe->pol, dir);
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
         upe->hard = !!hard;
 
         nlh->nlmsg_len = skb->tail - b;
@@ -1341,6 +1474,7 @@ static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_eve
 
         len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
         len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
+        len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
         skb = alloc_skb(len, GFP_ATOMIC);
         if (skb == NULL)
                 return -ENOMEM;