netdev - [PATCH v2 2/2] handshake: Fix sign of key_serial

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Date: Thu, 21 Sep 2023 09:08:07 -0400
From: Chuck Lever <cel@...nel.org>
To: netdev@...r.kernel.org, kernel-tls-handshake@...ts.linux.dev
Cc: Chuck Lever <chuck.lever@...cle.com>
Subject: [PATCH v2 2/2] handshake: Fix sign of key_serial_t fields

From: Chuck Lever <chuck.lever@...cle.com>

key_serial_t fields are signed integers. Use nla_get/put_s32 for
those to avoid implicit signed conversion in the netlink protocol.

Signed-off-by: Chuck Lever <chuck.lever@...cle.com>
---
 Documentation/netlink/specs/handshake.yaml |    4 ++--
 net/handshake/tlshd.c                      |    4 ++--
 tools/net/ynl/generated/handshake-user.h   |    4 ++--
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Documentation/netlink/specs/handshake.yaml b/Documentation/netlink/specs/handshake.yaml
index a49b46b80e16..b934cc513e3d 100644
--- a/Documentation/netlink/specs/handshake.yaml
+++ b/Documentation/netlink/specs/handshake.yaml
@@ -34,10 +34,10 @@ attribute-sets:
     attributes:
       -
         name: cert
-        type: u32
+        type: s32
       -
         name: privkey
-        type: u32
+        type: s32
   -
     name: accept
     attributes:
diff --git a/net/handshake/tlshd.c b/net/handshake/tlshd.c
index 7ac80201aa1f..d697f68c598c 100644
--- a/net/handshake/tlshd.c
+++ b/net/handshake/tlshd.c
@@ -173,9 +173,9 @@ static int tls_handshake_put_certificate(struct sk_buff *msg,
 	if (!entry_attr)
 		return -EMSGSIZE;
 
-	if (nla_put_u32(msg, HANDSHAKE_A_X509_CERT,
+	if (nla_put_s32(msg, HANDSHAKE_A_X509_CERT,
 			treq->th_certificate) ||
-	    nla_put_u32(msg, HANDSHAKE_A_X509_PRIVKEY,
+	    nla_put_s32(msg, HANDSHAKE_A_X509_PRIVKEY,
 			treq->th_privkey)) {
 		nla_nest_cancel(msg, entry_attr);
 		return -EMSGSIZE;
diff --git a/tools/net/ynl/generated/handshake-user.h b/tools/net/ynl/generated/handshake-user.h
index f8e481fa9e09..2b34acc608de 100644
--- a/tools/net/ynl/generated/handshake-user.h
+++ b/tools/net/ynl/generated/handshake-user.h
@@ -28,8 +28,8 @@ struct handshake_x509 {
 		__u32 privkey:1;
 	} _present;
 
-	__u32 cert;
-	__u32 privkey;
+	__s32 cert;
+	__s32 privkey;
 };
 
 /* ============== HANDSHAKE_CMD_ACCEPT ============== */