linux-hardening - [PATCH 2/5][next] nfsd: avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <9a04f3f766b2f8438887f6a003cf288d0f366fb8.1729037131.git.gustavoars@kernel.org>
Date: Tue, 15 Oct 2024 18:29:31 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Chuck Lever <chuck.lever@...cle.com>, Jeff Layton <jlayton@...nel.org>,
	Neil Brown <neilb@...e.de>, Olga Kornievskaia <okorniev@...hat.com>,
	Dai Ngo <Dai.Ngo@...cle.com>, Tom Talpey <tom@...pey.com>
Cc: linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: [PATCH 2/5][next] nfsd: avoid -Wflex-array-member-not-at-end warnings

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Address the following warnings by changing the type of the middle struct
members in `struct nfsd_genl_rqstp`, which are currently causing trouble,
from `struct sockaddr` to `struct sockaddr_legacy`. Note that the latter
struct doesn't contain a flexible-array member.

fs/nfsd/nfsd.h:74:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
fs/nfsd/nfsd.h:75:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Also, update some related code, accordingly.

No binary differences are present after these changes.

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 fs/nfsd/nfsctl.c | 4 ++--
 fs/nfsd/nfsd.h   | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 3adbc05ebaac..884bfdc7a255 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -1599,9 +1599,9 @@ int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
 			genl_rqstp.rq_stime = rqstp->rq_stime;
 			genl_rqstp.rq_opcnt = 0;
 			memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp),
-			       sizeof(struct sockaddr));
+			       sizeof(struct sockaddr_legacy));
 			memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp),
-			       sizeof(struct sockaddr));
+			       sizeof(struct sockaddr_legacy));
 
 #ifdef CONFIG_NFSD_V4
 			if (rqstp->rq_vers == NFS4_VERSION &&
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 004415651295..44be32510595 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -71,8 +71,8 @@ struct readdir_cd {
 #define NFSD_MAX_OPS_PER_COMPOUND	50
 
 struct nfsd_genl_rqstp {
-	struct sockaddr		rq_daddr;
-	struct sockaddr		rq_saddr;
+	struct sockaddr_legacy	rq_daddr;
+	struct sockaddr_legacy	rq_saddr;
 	unsigned long		rq_flags;
 	ktime_t			rq_stime;
 	__be32			rq_xid;
-- 
2.34.1