netdev - [PATCH v4] net: xfrm: Amend XFRMA_SEC_CTX nla

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Message-Id: <20230630081911.2983347-1-linma@zju.edu.cn>
Date: Fri, 30 Jun 2023 16:19:11 +0800
From: Lin Ma <linma@....edu.cn>
To: steffen.klassert@...unet.com,
	herbert@...dor.apana.org.au,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	netdev@...r.kernel.org,
	tgraf@...g.ch,
	simon.horman@...igine.com
Cc: Lin Ma <linma@....edu.cn>
Subject: [PATCH v4] net: xfrm: Amend XFRMA_SEC_CTX nla_policy structure

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@....edu.cn>
---
V1 -> V2: also amend compat_policy XFRMA_SEC_CTX
V2 -> V3: fix typo
V3 -> V4: remove confusing code from another patch

 net/xfrm/xfrm_compat.c | 2 +-
 net/xfrm/xfrm_user.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_compat.c b/net/xfrm/xfrm_compat.c
index 8cbf45a8bcdc..655fe4ff8621 100644
--- a/net/xfrm/xfrm_compat.c
+++ b/net/xfrm/xfrm_compat.c
@@ -108,7 +108,7 @@ static const struct nla_policy compat_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 },
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index c34a2a06ca94..1291b6dba458 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -3015,7 +3015,7 @@ 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 },
-- 
2.17.1