From owner-svn-src-head@freebsd.org Wed Jul 1 10:37:08 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 D3D9F34B211; Wed, 1 Jul 2020 10:37:08 +0000 (UTC) (envelope-from trasz@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 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 49xd2X5HQyz4H9C; Wed, 1 Jul 2020 10:37:08 +0000 (UTC) (envelope-from trasz@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 95E5127AB7; Wed, 1 Jul 2020 10:37:08 +0000 (UTC) (envelope-from trasz@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 061Ab8lj010660; Wed, 1 Jul 2020 10:37:08 GMT (envelope-from trasz@FreeBSD.org) Received: (from trasz@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 061Ab8GI010659; Wed, 1 Jul 2020 10:37:08 GMT (envelope-from trasz@FreeBSD.org) Message-Id: <202007011037.061Ab8GI010659@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: trasz set sender to trasz@FreeBSD.org using -f From: Edward Tomasz Napierala Date: Wed, 1 Jul 2020 10:37:08 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r362833 - head/sys/compat/linux X-SVN-Group: head X-SVN-Commit-Author: trasz X-SVN-Commit-Paths: head/sys/compat/linux X-SVN-Commit-Revision: 362833 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: 2.1.33 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: Wed, 01 Jul 2020 10:37:08 -0000 Author: trasz Date: Wed Jul 1 10:37:08 2020 New Revision: 362833 URL: https://svnweb.freebsd.org/changeset/base/362833 Log: Rework linux accept(2). This makes the code flow easier to follow, and fixes a bug where calling accept(2) could result in closing fd 0. Note that the code still contains a number of problems: it makes assumptions about l_sockaddr_in being the same as sockaddr_in, the EFAULT-related code looks like it doesn't work at all, and the socket type check is racy. Those will be addressed later on; I'm trying to work in small steps to avoid breaking one thing while fixing another. It fixes Redis, among other things. Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D25461 Modified: head/sys/compat/linux/linux_socket.c Modified: head/sys/compat/linux/linux_socket.c ============================================================================== --- head/sys/compat/linux/linux_socket.c Wed Jul 1 09:35:33 2020 (r362832) +++ head/sys/compat/linux/linux_socket.c Wed Jul 1 10:37:08 2020 (r362833) @@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include @@ -611,17 +612,19 @@ linux_accept_common(struct thread *td, int s, l_uintpt { struct l_sockaddr *lsa; struct sockaddr *sa; - struct file *fp; + struct file *fp, *fp1; int bflags, len; struct socket *so; int error, error1; bflags = 0; + fp = NULL; + sa = NULL; + error = linux_set_socket_flags(flags, &bflags); if (error != 0) return (error); - sa = NULL; if (PTRIN(addr) == NULL) { len = 0; error = kern_accept4(td, s, NULL, NULL, bflags, NULL); @@ -632,48 +635,54 @@ linux_accept_common(struct thread *td, int s, l_uintpt if (len < 0) return (EINVAL); error = kern_accept4(td, s, &sa, &len, bflags, &fp); - if (error == 0) - fdrop(fp, td); } + /* + * Translate errno values into ones used by Linux. + */ if (error != 0) { /* * XXX. This is wrong, different sockaddr structures * have different sizes. */ - if (error == EFAULT && namelen != sizeof(struct sockaddr_in)) - { - error = EINVAL; - goto out; - } - if (error == EINVAL) { - error1 = getsock_cap(td, s, &cap_accept_rights, &fp, NULL, NULL); + switch (error) { + case EFAULT: + if (namelen != sizeof(struct sockaddr_in)) + error = EINVAL; + break; + case EINVAL: + error1 = getsock_cap(td, s, &cap_accept_rights, &fp1, NULL, NULL); if (error1 != 0) { error = error1; - goto out; + break; } - so = fp->f_data; + so = fp1->f_data; if (so->so_type == SOCK_DGRAM) error = EOPNOTSUPP; - fdrop(fp, td); + fdrop(fp1, td); + break; } - goto out; + return (error); } - if (len != 0 && error == 0) { + if (len != 0) { error = bsd_to_linux_sockaddr(sa, &lsa, len); if (error == 0) error = copyout(lsa, PTRIN(addr), len); free(lsa, M_SONAME); - } - free(sa, M_SONAME); + /* + * XXX: We should also copyout the len, shouldn't we? + */ -out: - if (error != 0) { - (void)kern_close(td, td->td_retval[0]); - td->td_retval[0] = 0; + if (error != 0) { + fdclose(td, fp, td->td_retval[0]); + td->td_retval[0] = 0; + } } + if (fp != NULL) + fdrop(fp, td); + free(sa, M_SONAME); return (error); }