From owner-svn-src-stable@freebsd.org Fri Aug 4 08:12:20 2017 Return-Path: Delivered-To: svn-src-stable@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 DC139DCC479; Fri, 4 Aug 2017 08:12:20 +0000 (UTC) (envelope-from kib@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 AA02282EE3; Fri, 4 Aug 2017 08:12:20 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v748CJDE015961; Fri, 4 Aug 2017 08:12:19 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v748CJIZ015960; Fri, 4 Aug 2017 08:12:19 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201708040812.v748CJIZ015960@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Fri, 4 Aug 2017 08:12:19 +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: r322042 - stable/11/lib/libc/x86/sys X-SVN-Group: stable-11 X-SVN-Commit-Author: kib X-SVN-Commit-Paths: stable/11/lib/libc/x86/sys X-SVN-Commit-Revision: 322042 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@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Aug 2017 08:12:21 -0000 Author: kib Date: Fri Aug 4 08:12:19 2017 New Revision: 322042 URL: https://svnweb.freebsd.org/changeset/base/322042 Log: MFC r321652: Simplify flow control. Modified: stable/11/lib/libc/x86/sys/__vdso_gettc.c Directory Properties: stable/11/ (props changed) Modified: stable/11/lib/libc/x86/sys/__vdso_gettc.c ============================================================================== --- stable/11/lib/libc/x86/sys/__vdso_gettc.c Fri Aug 4 04:23:23 2017 (r322041) +++ stable/11/lib/libc/x86/sys/__vdso_gettc.c Fri Aug 4 08:12:19 2017 (r322042) @@ -146,25 +146,24 @@ __vdso_init_hpet(uint32_t u) if (old_map != NULL) return; - if (cap_getmode(&mode) == 0 && mode != 0) - goto fail; + /* + * Explicitely check for the capability mode to avoid + * triggering trap_enocap on the device open by absolute path. + */ + if ((cap_getmode(&mode) == 0 && mode != 0) || + (fd = _open(devname, O_RDONLY)) == -1) { + /* Prevent the caller from re-entering. */ + atomic_cmpset_rel_ptr((volatile uintptr_t *)&hpet_dev_map[u], + (uintptr_t)old_map, (uintptr_t)MAP_FAILED); + return; + } - fd = _open(devname, O_RDONLY); - if (fd == -1) - goto fail; - new_map = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_SHARED, fd, 0); _close(fd); if (atomic_cmpset_rel_ptr((volatile uintptr_t *)&hpet_dev_map[u], (uintptr_t)old_map, (uintptr_t)new_map) == 0 && new_map != MAP_FAILED) munmap((void *)new_map, PAGE_SIZE); - - return; -fail: - /* Prevent the caller from re-entering. */ - atomic_cmpset_rel_ptr((volatile uintptr_t *)&hpet_dev_map[u], - (uintptr_t)old_map, (uintptr_t)MAP_FAILED); } #ifdef WANT_HYPERV