netdev - [PATCH 4/4] xfrm: Restrict percpu SA attribute to specific netlink message types

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Message-ID: <20241007064453.2171933-5-steffen.klassert@secunet.com>
Date: Mon, 7 Oct 2024 08:44:53 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Tobias Brunner <tobias@...ongswan.org>, Antony Antony
	<antony.antony@...unet.com>, Daniel Xu <dxu@...uu.xyz>, Paul Wouters
	<paul@...ats.ca>, Simon Horman <horms@...nel.org>, Sabrina Dubroca
	<sd@...asysnail.net>, <netdev@...r.kernel.org>
CC: Steffen Klassert <steffen.klassert@...unet.com>, <devel@...ux-ipsec.org>
Subject: [PATCH 4/4] xfrm: Restrict percpu SA attribute to specific netlink message types

Reject the usage of XFRMA_SA_PCPU in xfrm netlink messages when
it's not applicable.

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_user.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 6bf53e17d382..291bc320c072 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -3276,6 +3276,20 @@ static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
 		}
 	}
 
+	if (attrs[XFRMA_SA_PCPU]) {
+		switch (type) {
+		case XFRM_MSG_NEWSA:
+		case XFRM_MSG_UPDSA:
+		case XFRM_MSG_ALLOCSPI:
+		case XFRM_MSG_ACQUIRE:
+
+			break;
+		default:
+			NL_SET_ERR_MSG(extack, "Invalid attribute SA_PCPU");
+			return -EINVAL;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.34.1