From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 88237174CA for ; Wed, 9 Aug 2023 10:59:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04759C433C9; Wed, 9 Aug 2023 10:59:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691578789; bh=uABZAp7WCzbTJt+0ts5NNTFbJVnOFl0TsAjn0kXLvhc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P1VYjzXOCrJ6T8fQ+jS4W+vj+Phh7AKQXC1Av8yeFAHNI5XHy7QR39Sy+lRos1iQv ofcofCKvDiB19Yey4FOYhNorP3wP6AZ25TE3dtXozgmi9yS4Zg2qaeKpWoDRPyjV2l z/vpZ2FaiY46ALGCLA88wP0DArvlcyhzfveJd9q8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Eric Dumazet , Willem de Bruijn , "David S. Miller" , Sasha Levin Subject: [PATCH 5.15 29/92] net: add missing data-race annotations around sk->sk_peek_off Date: Wed, 9 Aug 2023 12:41:05 +0200 Message-ID: <20230809103634.634805395@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103633.485906560@linuxfoundation.org> References: <20230809103633.485906560@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Eric Dumazet [ Upstream commit 11695c6e966b0ec7ed1d16777d294cef865a5c91 ] sk_getsockopt() runs locklessly, thus we need to annotate the read of sk->sk_peek_off. While we are at it, add corresponding annotations to sk_set_peek_off() and unix_set_peek_off(). Fixes: b9bb53f3836f ("sock: convert sk_peek_offset functions to WRITE_ONCE") Signed-off-by: Eric Dumazet Cc: Willem de Bruijn Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/core/sock.c | 4 ++-- net/unix/af_unix.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/net/core/sock.c b/net/core/sock.c index 59abfb2c92266..0cca1ccf14990 100644 --- a/net/core/sock.c +++ b/net/core/sock.c @@ -1643,7 +1643,7 @@ int sock_getsockopt(struct socket *sock, int level, int optname, if (!sock->ops->set_peek_off) return -EOPNOTSUPP; - v.val = sk->sk_peek_off; + v.val = READ_ONCE(sk->sk_peek_off); break; case SO_NOFCS: v.val = sock_flag(sk, SOCK_NOFCS); @@ -2901,7 +2901,7 @@ EXPORT_SYMBOL(__sk_mem_reclaim); int sk_set_peek_off(struct sock *sk, int val) { - sk->sk_peek_off = val; + WRITE_ONCE(sk->sk_peek_off, val); return 0; } EXPORT_SYMBOL_GPL(sk_set_peek_off); diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index d326540e4938c..7a076d5017d1c 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -717,7 +717,7 @@ static int unix_set_peek_off(struct sock *sk, int val) if (mutex_lock_interruptible(&u->iolock)) return -EINTR; - sk->sk_peek_off = val; + WRITE_ONCE(sk->sk_peek_off, val); mutex_unlock(&u->iolock); return 0; -- 2.40.1