net: xfrm: Amend XFRMA_SEC_CTX nla_policy structure

commit d1e0e61d617ba17aa516db707aa871387566bbf7 upstream.

According to all consumers code of attrs[XFRMA_SEC_CTX], like

* verify_sec_ctx_len(), convert to xfrm_user_sec_ctx*
* xfrm_state_construct(), call security_xfrm_state_alloc whose prototype
is int security_xfrm_state_alloc(.., struct xfrm_user_sec_ctx *sec_ctx);
* copy_from_user_sec_ctx(), convert to xfrm_user_sec_ctx *
...

It seems that the expected parsing result for XFRMA_SEC_CTX should be
structure xfrm_user_sec_ctx, and the current xfrm_sec_ctx is confusing
and misleading (Luckily, they happen to have same size 8 bytes).

This commit amend the policy structure to xfrm_user_sec_ctx to avoid
ambiguity.

Fixes: cf5cb79f6946 ("[XFRM] netlink: Establish an attribute policy")
Signed-off-by: Lin Ma <linma@zju.edu.cn>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 224f627e0f6df7850758fb5772c34888f90452f1..f1109da9ece6ec615325b9c254f8d0a5d932ac6c 100644 (file)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -2514,7 +2514,7 @@ static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
        [XFRMA_ALG_COMP]        = { .len = sizeof(struct xfrm_algo) },
        [XFRMA_ENCAP]           = { .len = sizeof(struct xfrm_encap_tmpl) },
        [XFRMA_TMPL]            = { .len = sizeof(struct xfrm_user_tmpl) },
-       [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_sec_ctx) },
+       [XFRMA_SEC_CTX]         = { .len = sizeof(struct xfrm_user_sec_ctx) },
        [XFRMA_LTIME_VAL]       = { .len = sizeof(struct xfrm_lifetime_cur) },
        [XFRMA_REPLAY_VAL]      = { .len = sizeof(struct xfrm_replay_state) },
        [XFRMA_REPLAY_THRESH]   = { .type = NLA_U32 },