From owner-svn-src-head@freebsd.org Fri Mar 20 20:09:01 2020 Return-Path: Delivered-To: svn-src-head@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 9E2E3271E98; Fri, 20 Mar 2020 20:09:01 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 48kZbx3DKLz4PP4; Fri, 20 Mar 2020 20:09:01 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4F6D4EE9; Fri, 20 Mar 2020 20:09:01 +0000 (UTC) (envelope-from markj@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 02KK91c0009693; Fri, 20 Mar 2020 20:09:01 GMT (envelope-from markj@FreeBSD.org) Received: (from markj@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 02KK91fV009692; Fri, 20 Mar 2020 20:09:01 GMT (envelope-from markj@FreeBSD.org) Message-Id: <202003202009.02KK91fV009692@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: markj set sender to markj@FreeBSD.org using -f From: Mark Johnston Date: Fri, 20 Mar 2020 20:09:01 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r359184 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: markj X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 359184 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Mar 2020 20:09:01 -0000 Author: markj Date: Fri Mar 20 20:09:00 2020 New Revision: 359184 URL: https://svnweb.freebsd.org/changeset/base/359184 Log: Lock the socket in soo_stat(). Otherwise nothing synchronizes with a concurrent conversion of the socket to a listening socket. Only the PF_LOCAL protocols implement pru_sense, and it is safe to hold the socket lock there, so do so for now. Reported by: syzbot+4801f1b79ea40953ca8e@syzkaller.appspotmail.com MFC after: 1 week Sponsored by: The FreeBSD Foundation Modified: head/sys/kern/sys_socket.c Modified: head/sys/kern/sys_socket.c ============================================================================== --- head/sys/kern/sys_socket.c Fri Mar 20 20:02:53 2020 (r359183) +++ head/sys/kern/sys_socket.c Fri Mar 20 20:09:00 2020 (r359184) @@ -287,9 +287,7 @@ soo_stat(struct file *fp, struct stat *ub, struct ucre struct thread *td) { struct socket *so = fp->f_data; -#ifdef MAC int error; -#endif bzero((caddr_t)ub, sizeof (*ub)); ub->st_mode = S_IFSOCK; @@ -298,6 +296,7 @@ soo_stat(struct file *fp, struct stat *ub, struct ucre if (error) return (error); #endif + SOCK_LOCK(so); if (!SOLISTENING(so)) { struct sockbuf *sb; @@ -320,7 +319,9 @@ soo_stat(struct file *fp, struct stat *ub, struct ucre } ub->st_uid = so->so_cred->cr_uid; ub->st_gid = so->so_cred->cr_gid; - return (*so->so_proto->pr_usrreqs->pru_sense)(so, ub); + error = so->so_proto->pr_usrreqs->pru_sense(so, ub); + SOCK_UNLOCK(so); + return (error); } /*