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Date: Thu, 26 Jul 2018 03:31:39 +0100
From: Dmitry Safonov <dima@...sta.com>
To: linux-kernel@...r.kernel.org
Cc: Dmitry Safonov <dima@...sta.com>,
"David S. Miller" <davem@...emloft.net>,
Herbert Xu <herbert@...dor.apana.org.au>,
Steffen Klassert <steffen.klassert@...unet.com>,
Dmitry Safonov <0x7f454c46@...il.com>, netdev@...r.kernel.org
Subject: [PATCH 13/18] xfrm: Add compat support for xfrm_user_acquire messages
Parse acquire messages sent by userspace according to in_compat_syscall().
Applications that used native bind() syscall are in XFRMNLGRP_ACQUIRE, so
send there xfrm_usersa_info messages (with 64-bit ABI). Compatible
applications are added to kernel-hidden XFRMNLGRP_COMPAT_ACQUIRE group, so
send there xfrm_usersa_info messages_packed (with 32-bit ABI)
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
Cc: netdev@...r.kernel.org
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
net/xfrm/xfrm_user.c | 113 +++++++++++++++++++++++++++++++++++----------------
1 file changed, 77 insertions(+), 36 deletions(-)
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index df792a3be8f2..89f891a0a9a4 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -73,6 +73,17 @@ struct xfrm_user_expire_packed {
__u8 __pad[3];
} __packed;
+struct xfrm_user_acquire_packed {
+ struct xfrm_id id;
+ xfrm_address_t saddr;
+ struct xfrm_selector sel;
+ struct xfrm_userpolicy_info_packed policy;
+ __u32 aalgos;
+ __u32 ealgos;
+ __u32 calgos;
+ __u32 seq;
+} __packed;
+
/* In-kernel, non-uapi compat groups.
* As compat/native messages differ, send notifications according
* to .bind() caller's ABI. There are *_COMPAT hidden from userspace
@@ -2316,8 +2327,8 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
struct nlattr *rt = attrs[XFRMA_TMPL];
struct xfrm_mark mark;
- struct xfrm_user_acquire *ua = nlmsg_data(nlh);
- struct xfrm_userpolicy_info_packed *upi = (void *)&ua->policy;
+ struct xfrm_user_acquire_packed *ua = nlmsg_data(nlh);
+ struct xfrm_user_acquire *_ua = nlmsg_data(nlh);
struct xfrm_state *x = xfrm_state_alloc(net);
int err = -ENOMEM;
@@ -2326,12 +2337,12 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
xfrm_mark_get(attrs, &mark);
- err = verify_newpolicy_info(upi);
+ err = verify_newpolicy_info(&ua->policy);
if (err)
goto free_state;
/* build an XP */
- xp = xfrm_policy_construct(net, upi, attrs, &err);
+ xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
if (!xp)
goto free_state;
@@ -2348,9 +2359,15 @@ static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
x->props.mode = t->mode;
x->props.reqid = t->reqid;
x->props.family = ut->family;
- t->aalgos = ua->aalgos;
- t->ealgos = ua->ealgos;
- t->calgos = ua->calgos;
+ if (in_compat_syscall()) {
+ t->aalgos = ua->aalgos;
+ t->ealgos = ua->ealgos;
+ t->calgos = ua->calgos;
+ } else {
+ t->aalgos = _ua->aalgos;
+ t->ealgos = _ua->ealgos;
+ t->calgos = _ua->calgos;
+ }
err = km_query(x, t, xp);
}
@@ -3017,25 +3034,32 @@ static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c
}
-static inline unsigned int xfrm_acquire_msgsize(struct xfrm_state *x,
- struct xfrm_policy *xp)
+static int build_acquire(struct sk_buff **skb, struct xfrm_state *x,
+ struct xfrm_tmpl *xt, struct xfrm_policy *xp,
+ bool compat)
{
- return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
+ __u32 seq = xfrm_get_acqseq();
+ struct xfrm_user_acquire_packed *ua;
+ struct nlmsghdr *nlh;
+ unsigned int ua_size, ack_msgsize;
+ int err;
+
+ if (compat)
+ ua_size = NLMSG_ALIGN(sizeof(struct xfrm_user_acquire_packed));
+ else
+ ua_size = NLMSG_ALIGN(sizeof(struct xfrm_user_acquire));
+
+ ack_msgsize = ua_size
+ nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
+ nla_total_size(sizeof(struct xfrm_mark))
+ nla_total_size(xfrm_user_sec_ctx_size(x->security))
+ userpolicy_type_attrsize();
-}
-static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
- struct xfrm_tmpl *xt, struct xfrm_policy *xp)
-{
- __u32 seq = xfrm_get_acqseq();
- struct xfrm_user_acquire *ua;
- struct nlmsghdr *nlh;
- int err;
+ *skb = nlmsg_new(ack_msgsize, GFP_ATOMIC);
+ if (*skb == NULL)
+ return -ENOMEM;
- nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
+ nlh = nlmsg_put(*skb, 0, 0, XFRM_MSG_ACQUIRE, ua_size, 0);
if (nlh == NULL)
return -EMSGSIZE;
@@ -3043,25 +3067,36 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
memcpy(&ua->id, &x->id, sizeof(ua->id));
memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
- copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
- ua->aalgos = xt->aalgos;
- ua->ealgos = xt->ealgos;
- ua->calgos = xt->calgos;
- ua->seq = x->km.seq = seq;
- err = copy_to_user_tmpl(xp, skb);
+ if (compat) {
+ copy_to_user_policy_compat(xp, &ua->policy, XFRM_POLICY_OUT);
+ ua->aalgos = xt->aalgos;
+ ua->ealgos = xt->ealgos;
+ ua->calgos = xt->calgos;
+ ua->seq = x->km.seq = seq;
+ } else {
+ struct xfrm_user_acquire *_ua = nlmsg_data(nlh);
+
+ copy_to_user_policy(xp, &_ua->policy, XFRM_POLICY_OUT);
+ _ua->aalgos = xt->aalgos;
+ _ua->ealgos = xt->ealgos;
+ _ua->calgos = xt->calgos;
+ _ua->seq = x->km.seq = seq;
+ }
+
+ err = copy_to_user_tmpl(xp, *skb);
if (!err)
- err = copy_to_user_state_sec_ctx(x, skb);
+ err = copy_to_user_state_sec_ctx(x, *skb);
if (!err)
- err = copy_to_user_policy_type(xp->type, skb);
+ err = copy_to_user_policy_type(xp->type, *skb);
if (!err)
- err = xfrm_mark_put(skb, &xp->mark);
+ err = xfrm_mark_put(*skb, &xp->mark);
if (err) {
- nlmsg_cancel(skb, nlh);
+ nlmsg_cancel(*skb, nlh);
return err;
}
- nlmsg_end(skb, nlh);
+ nlmsg_end(*skb, nlh);
return 0;
}
@@ -3072,14 +3107,20 @@ static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
struct sk_buff *skb;
int err;
- skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
- if (skb == NULL)
- return -ENOMEM;
- err = build_acquire(skb, x, xt, xp);
- BUG_ON(err < 0);
+ err = build_acquire(&skb, x, xt, xp, false);
+ if (err)
+ return err;
+
+ err = xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
+ if ((err && err != -ESRCH) || !IS_ENABLED(CONFIG_COMPAT))
+ return err;
+
+ err = build_acquire(&skb, x, xt, xp, true);
+ if (err)
+ return err;
- return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
+ return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_COMPAT_ACQUIRE);
}
/* User gives us xfrm_user_policy_info followed by an array of 0
--
2.13.6
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