diff mbox series

[ipsec-next,v14,4/4] xfrm: Restrict SA direction attribute to specific netlink message types

Message ID 35892b6ac691f9fcc5545a1f5b364111c25b1310.1714460330.git.antony.antony@secunet.com (mailing list archive)
State Awaiting Upstream
Delegated to: Netdev Maintainers
Headers show
Series xfrm: Introduce direction attribute for SA | expand

Checks

Context Check Description
netdev/series_format warning Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 941 this patch: 941
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 6 of 6 maintainers
netdev/build_clang success Errors and warnings before: 937 this patch: 937
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 952 this patch: 952
netdev/checkpatch warning WARNING: line length of 85 exceeds 80 columns
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Antony Antony April 30, 2024, 7:09 a.m. UTC 
Reject the usage of the SA_DIR attribute in xfrm netlink messages when
it's not applicable. This ensures that SA_DIR is only accepted for
certain message types (NEWSA, UPDSA, and ALLOCSPI)

Signed-off-by: Antony Antony <antony.antony@secunet.com>
---
v12 -> 13
 - renamed the function for clarity

v11 -> 12
  - fix spd look up. This broke xfrm_policy tests
---
 net/xfrm/xfrm_user.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--
2.30.2
diff mbox series

Patch

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index f5eb3af4fb81..e83c687bd64e 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -3213,6 +3213,24 @@  static const struct xfrm_link {
 	[XFRM_MSG_GETDEFAULT  - XFRM_MSG_BASE] = { .doit = xfrm_get_default   },
 };

+static int xfrm_reject_unused_attr(int type, struct nlattr **attrs,
+				   struct netlink_ext_ack *extack)
+{
+	if (attrs[XFRMA_SA_DIR]) {
+		switch (type) {
+		case XFRM_MSG_NEWSA:
+		case XFRM_MSG_UPDSA:
+		case XFRM_MSG_ALLOCSPI:
+			break;
+		default:
+			NL_SET_ERR_MSG(extack, "Invalid attribute SA_DIR");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 			     struct netlink_ext_ack *extack)
 {
@@ -3272,6 +3290,12 @@  static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err < 0)
 		goto err;

+	if (!link->nla_pol || link->nla_pol == xfrma_policy) {
+		err = xfrm_reject_unused_attr((type + XFRM_MSG_BASE), attrs, extack);
+		if (err < 0)
+			goto err;
+	}
+
 	if (link->doit == NULL) {
 		err = -EINVAL;
 		goto err;