linux-kernel - [PATCH v6.6 01/26] af_unix: Return struct unix_sock from unix_get

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250521144803.2050504-2-lee@kernel.org>
Date: Wed, 21 May 2025 14:45:09 +0000
From: Lee Jones <lee@...nel.org>
To: lee@...nel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>,
	Jens Axboe <axboe@...nel.dk>,
	Sasha Levin <sashal@...nel.org>,
	Michal Luczaj <mhal@...x.co>,
	Rao Shoaib <Rao.Shoaib@...cle.com>,
	Pavel Begunkov <asml.silence@...il.com>,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Cc: stable@...r.kernel.org,
	Simon Horman <horms@...nel.org>
Subject: [PATCH v6.6 01/26] af_unix: Return struct unix_sock from unix_get_socket().

From: Kuniyuki Iwashima <kuniyu@...zon.com>

[ Upstream commit 5b17307bd0789edea0675d524a2b277b93bbde62 ]

Currently, unix_get_socket() returns struct sock, but after calling
it, we always cast it to unix_sk().

Let's return struct unix_sock from unix_get_socket().

Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
Acked-by: Pavel Begunkov <asml.silence@...il.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Link: https://lore.kernel.org/r/20240123170856.41348-4-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
(cherry picked from commit 5b17307bd0789edea0675d524a2b277b93bbde62)
Signed-off-by: Lee Jones <lee@...nel.org>
---
 include/net/af_unix.h |  2 +-
 net/unix/garbage.c    | 19 +++++++------------
 net/unix/scm.c        | 19 +++++++------------
 3 files changed, 15 insertions(+), 25 deletions(-)

diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 77bf30203d3cf..7a00d7ed527b6 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -14,7 +14,7 @@ void unix_destruct_scm(struct sk_buff *skb);
 void io_uring_destruct_scm(struct sk_buff *skb);
 void unix_gc(void);
 void wait_for_unix_gc(void);
-struct sock *unix_get_socket(struct file *filp);
+struct unix_sock *unix_get_socket(struct file *filp);
 struct sock *unix_peer_get(struct sock *sk);
 
 #define UNIX_HASH_MOD	(256 - 1)
diff --git a/net/unix/garbage.c b/net/unix/garbage.c
index 2a758531e1027..38639766b9e7c 100644
--- a/net/unix/garbage.c
+++ b/net/unix/garbage.c
@@ -105,20 +105,15 @@ static void scan_inflight(struct sock *x, void (*func)(struct unix_sock *),
 
 			while (nfd--) {
 				/* Get the socket the fd matches if it indeed does so */
-				struct sock *sk = unix_get_socket(*fp++);
+				struct unix_sock *u = unix_get_socket(*fp++);
 
-				if (sk) {
-					struct unix_sock *u = unix_sk(sk);
+				/* Ignore non-candidates, they could have been added
+				 * to the queues after starting the garbage collection
+				 */
+				if (u && test_bit(UNIX_GC_CANDIDATE, &u->gc_flags)) {
+					hit = true;
 
-					/* Ignore non-candidates, they could
-					 * have been added to the queues after
-					 * starting the garbage collection
-					 */
-					if (test_bit(UNIX_GC_CANDIDATE, &u->gc_flags)) {
-						hit = true;
-
-						func(u);
-					}
+					func(u);
 				}
 			}
 			if (hit && hitlist != NULL) {
diff --git a/net/unix/scm.c b/net/unix/scm.c
index e92f2fad64105..b5ae5ab167773 100644
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -21,9 +21,8 @@ EXPORT_SYMBOL(gc_inflight_list);
 DEFINE_SPINLOCK(unix_gc_lock);
 EXPORT_SYMBOL(unix_gc_lock);
 
-struct sock *unix_get_socket(struct file *filp)
+struct unix_sock *unix_get_socket(struct file *filp)
 {
-	struct sock *u_sock = NULL;
 	struct inode *inode = file_inode(filp);
 
 	/* Socket ? */
@@ -34,10 +33,10 @@ struct sock *unix_get_socket(struct file *filp)
 
 		/* PF_UNIX ? */
 		if (s && ops && ops->family == PF_UNIX)
-			u_sock = s;
+			return unix_sk(s);
 	}
 
-	return u_sock;
+	return NULL;
 }
 EXPORT_SYMBOL(unix_get_socket);
 
@@ -46,13 +45,11 @@ EXPORT_SYMBOL(unix_get_socket);
  */
 void unix_inflight(struct user_struct *user, struct file *fp)
 {
-	struct sock *s = unix_get_socket(fp);
+	struct unix_sock *u = unix_get_socket(fp);
 
 	spin_lock(&unix_gc_lock);
 
-	if (s) {
-		struct unix_sock *u = unix_sk(s);
-
+	if (u) {
 		if (!u->inflight) {
 			BUG_ON(!list_empty(&u->link));
 			list_add_tail(&u->link, &gc_inflight_list);
@@ -69,13 +66,11 @@ void unix_inflight(struct user_struct *user, struct file *fp)
 
 void unix_notinflight(struct user_struct *user, struct file *fp)
 {
-	struct sock *s = unix_get_socket(fp);
+	struct unix_sock *u = unix_get_socket(fp);
 
 	spin_lock(&unix_gc_lock);
 
-	if (s) {
-		struct unix_sock *u = unix_sk(s);
-
+	if (u) {
 		BUG_ON(!u->inflight);
 		BUG_ON(list_empty(&u->link));
 
-- 
2.49.0.1112.g889b7c5bd8-goog