From owner-svn-src-stable-11@freebsd.org Wed May 6 21:59:59 2020 Return-Path: Delivered-To: svn-src-stable-11@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 025062E08C7; Wed, 6 May 2020 21:59:59 +0000 (UTC) (envelope-from tuexen@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 49HVrG6KL5z4FLg; Wed, 6 May 2020 21:59:58 +0000 (UTC) (envelope-from tuexen@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 CFC096492; Wed, 6 May 2020 21:59:58 +0000 (UTC) (envelope-from tuexen@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 046Lxwj8023190; Wed, 6 May 2020 21:59:58 GMT (envelope-from tuexen@FreeBSD.org) Received: (from tuexen@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 046LxwxL023189; Wed, 6 May 2020 21:59:58 GMT (envelope-from tuexen@FreeBSD.org) Message-Id: <202005062159.046LxwxL023189@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: tuexen set sender to tuexen@FreeBSD.org using -f From: Michael Tuexen Date: Wed, 6 May 2020 21:59:58 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r360705 - stable/11/sys/kern X-SVN-Group: stable-11 X-SVN-Commit-Author: tuexen X-SVN-Commit-Paths: stable/11/sys/kern X-SVN-Commit-Revision: 360705 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 May 2020 21:59:59 -0000 Author: tuexen Date: Wed May 6 21:59:58 2020 New Revision: 360705 URL: https://svnweb.freebsd.org/changeset/base/360705 Log: MFC r349989: Improve input validation for l_linger When using the SOL_SOCKET level socket option SO_LINGER, the structure struct linger is used as the option value. The component l_linger is of type int, but internally copied to the field so_linger of the structure struct socket. The type of so_linger is short, but it is assumed to be non-negative and the value is used to compute ticks to be stored in a variable of type int. Therefore, perform input validation on l_linger similar to the one performed by NetBSD and OpenBSD. Thanks to syzkaller for making me aware of this issue. Thanks to markj@ for pointing out that a similar check should be added to so_linger_set(). Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D20948 Modified: stable/11/sys/kern/uipc_socket.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/kern/uipc_socket.c ============================================================================== --- stable/11/sys/kern/uipc_socket.c Wed May 6 19:58:37 2020 (r360704) +++ stable/11/sys/kern/uipc_socket.c Wed May 6 21:59:58 2020 (r360705) @@ -2535,7 +2535,12 @@ sosetopt(struct socket *so, struct sockopt *sopt) error = sooptcopyin(sopt, &l, sizeof l, sizeof l); if (error) goto bad; - + if (l.l_linger < 0 || + l.l_linger > USHRT_MAX || + l.l_linger > (INT_MAX / hz)) { + error = EDOM; + goto bad; + } SOCK_LOCK(so); so->so_linger = l.l_linger; if (l.l_onoff) @@ -3701,6 +3706,9 @@ so_linger_get(const struct socket *so) void so_linger_set(struct socket *so, int val) { + + KASSERT(val >= 0 && val <= USHRT_MAX && val <= (INT_MAX / hz), + ("%s: val %d out of range", __func__, val)); so->so_linger = val; }