From owner-svn-src-all@freebsd.org Fri Mar 4 15:30:42 2016 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DADBB9DB9CE; Fri, 4 Mar 2016 15:30:42 +0000 (UTC) (envelope-from pfg@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 mx1.freebsd.org (Postfix) with ESMTPS id 8EFFCE4D; Fri, 4 Mar 2016 15:30:42 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u24FUfYx021610; Fri, 4 Mar 2016 15:30:41 GMT (envelope-from pfg@FreeBSD.org) Received: (from pfg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id u24FUfu5021609; Fri, 4 Mar 2016 15:30:41 GMT (envelope-from pfg@FreeBSD.org) Message-Id: <201603041530.u24FUfu5021609@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: pfg set sender to pfg@FreeBSD.org using -f From: "Pedro F. Giffuni" Date: Fri, 4 Mar 2016 15:30:41 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r296386 - head/lib/libc/rpc X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Mar 2016 15:30:43 -0000 Author: pfg Date: Fri Mar 4 15:30:41 2016 New Revision: 296386 URL: https://svnweb.freebsd.org/changeset/base/296386 Log: Work around aliasing issues detected in modern GCC. Avoid casting gymnastics that lead to pointer aliasing by introducing an inline function as done in NetBSD (but without #if0'd WIP code). Obtained from: NetBSD (CVS Rev. 1.24, 1.25) Modified: head/lib/libc/rpc/clnt_vc.c Modified: head/lib/libc/rpc/clnt_vc.c ============================================================================== --- head/lib/libc/rpc/clnt_vc.c Fri Mar 4 14:23:34 2016 (r296385) +++ head/lib/libc/rpc/clnt_vc.c Fri Mar 4 15:30:41 2016 (r296386) @@ -502,6 +502,20 @@ clnt_vc_abort(CLIENT *cl) { } +static __inline void +htonlp(void *dst, const void *src, uint32_t incr) +{ + /* We are aligned, so we think */ + *(uint32_t *)dst = htonl(*(const uint32_t *)src + incr); +} + +static __inline void +ntohlp(void *dst, const void *src) +{ + /* We are aligned, so we think */ + *(uint32_t *)dst = htonl(*(const uint32_t *)src); +} + static bool_t clnt_vc_control(CLIENT *cl, u_int request, void *info) { @@ -576,14 +590,12 @@ clnt_vc_control(CLIENT *cl, u_int reques * first element in the call structure * This will get the xid of the PREVIOUS call */ - *(u_int32_t *)info = - ntohl(*(u_int32_t *)(void *)&ct->ct_u.ct_mcalli); + ntohlp(info, &ct->ct_u.ct_mcalli); break; case CLSET_XID: /* This will set the xid of the NEXT call */ - *(u_int32_t *)(void *)&ct->ct_u.ct_mcalli = - htonl(*((u_int32_t *)info) + 1); /* increment by 1 as clnt_vc_call() decrements once */ + htonlp(&ct->ct_u.ct_mcalli, info, 1); break; case CLGET_VERS: /* @@ -592,15 +604,11 @@ clnt_vc_control(CLIENT *cl, u_int reques * begining of the RPC header. MUST be changed if the * call_struct is changed */ - *(u_int32_t *)info = - ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + - 4 * BYTES_PER_XDR_UNIT)); + ntohlp(info, ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT); break; case CLSET_VERS: - *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + - 4 * BYTES_PER_XDR_UNIT) = - htonl(*(u_int32_t *)info); + htonlp(ct->ct_u.ct_mcallc + 4 * BYTES_PER_XDR_UNIT, info, 0); break; case CLGET_PROG: @@ -610,15 +618,11 @@ clnt_vc_control(CLIENT *cl, u_int reques * begining of the RPC header. MUST be changed if the * call_struct is changed */ - *(u_int32_t *)info = - ntohl(*(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + - 3 * BYTES_PER_XDR_UNIT)); + ntohlp(info, ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT); break; case CLSET_PROG: - *(u_int32_t *)(void *)(ct->ct_u.ct_mcallc + - 3 * BYTES_PER_XDR_UNIT) = - htonl(*(u_int32_t *)info); + htonlp(ct->ct_u.ct_mcallc + 3 * BYTES_PER_XDR_UNIT, info, 0); break; default: