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Commit 0f1aab4b authored by Dmitry Safonov's avatar Dmitry Safonov Committed by Alistair Delva
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BACKPORT: xfrm/compat: Translate 32-bit user_policy from sockptr 



Provide compat_xfrm_userpolicy_info translation for xfrm setsocketopt().
Reallocate buffer and put the missing padding for 64-bit message.

Signed-off-by: default avatarDmitry Safonov <dima@arista.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
(cherry picked from commit 96392ee5a13b992563cfe07d23ee30d333b89126)
[adelva: Edited around removed compat check in Android kernels]
Bug: 163141236
Signed-off-by: default avatarAlistair Delva <adelva@google.com>
Change-Id: I32a6495cd92fa13c956fca88aa5d80716155b8ae
parent 77d2c7b9

include/net/xfrm.h

+3 −0
Original line number Diff line number Diff line
@@ -2106,6 +2106,9 @@ struct xfrm_translator { 
			int maxtype, const struct nla_policy *policy,

			struct netlink_ext_ack *extack);



	/* Translate 32-bit user_policy from sockptr */

	int (*xlate_user_policy_sockptr)(u8 **pdata32, int optlen);



	struct module *owner;

};

net/xfrm/xfrm_compat.c

+26 −0
Original line number Diff line number Diff line
@@ -576,10 +576,36 @@ static struct nlmsghdr *xfrm_user_rcv_msg_compat(const struct nlmsghdr *h32, 
	return h64;

}



static int xfrm_user_policy_compat(u8 **pdata32, int optlen)

{

	struct compat_xfrm_userpolicy_info *p = (void *)*pdata32;

	u8 *src_templates, *dst_templates;

	u8 *data64;



	if (optlen < sizeof(*p))

		return -EINVAL;



	data64 = kmalloc(optlen + 4, GFP_USER | __GFP_NOWARN);

	if (!data64)

		return -ENOMEM;



	memcpy(data64, *pdata32, sizeof(*p));

	memset(data64 + sizeof(*p), 0, 4);



	src_templates = *pdata32 + sizeof(*p);

	dst_templates = data64 + sizeof(*p) + 4;

	memcpy(dst_templates, src_templates, optlen - sizeof(*p));



	kfree(*pdata32);

	*pdata32 = data64;

	return 0;

}



static struct xfrm_translator xfrm_translator = {

	.owner				= THIS_MODULE,

	.alloc_compat			= xfrm_alloc_compat,

	.rcv_msg_compat			= xfrm_user_rcv_msg_compat,

	.xlate_user_policy_sockptr	= xfrm_user_policy_compat,

};



static int __init xfrm_compat_init(void)

net/xfrm/xfrm_state.c

+14 −0
Original line number Diff line number Diff line
@@ -2199,6 +2199,20 @@ int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen 
	if (IS_ERR(data))

		return PTR_ERR(data);



	if (in_compat_syscall()) {

		struct xfrm_translator *xtr = xfrm_get_translator();



		if (!xtr)

			return -EOPNOTSUPP;



		err = xtr->xlate_user_policy_sockptr(&data, optlen);

		xfrm_put_translator(xtr);

		if (err) {

			kfree(data);

			return err;

		}

	}



	err = -EINVAL;

	rcu_read_lock();

	list_for_each_entry_rcu(km, &xfrm_km_list, list) {