From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751654AbbLJB2M (ORCPT ); Wed, 9 Dec 2015 20:28:12 -0500 Received: from 1.mo1.mail-out.ovh.net ([178.32.127.22]:40193 "EHLO 1.mo1.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750910AbbLJB2L (ORCPT ); Wed, 9 Dec 2015 20:28:11 -0500 X-Greylist: delayed 2405 seconds by postgrey-1.27 at vger.kernel.org; Wed, 09 Dec 2015 20:28:11 EST From: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= To: linux-kernel@vger.kernel.org Cc: =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= , Jeff Dike , Richard Weinberger , Tristan Schmelcher , Greg Kroah-Hartman , user-mode-linux-devel@lists.sourceforge.net, user-mode-linux-user@lists.sourceforge.net Subject: [PATCH v3 2/2] um: Use race-free temporary file creation Date: Thu, 10 Dec 2015 01:09:44 +0100 Message-Id: <1449706184-19284-3-git-send-email-mic@digikod.net> X-Mailer: git-send-email 2.6.2 In-Reply-To: <1449706184-19284-1-git-send-email-mic@digikod.net> References: <1449706184-19284-1-git-send-email-mic@digikod.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Ovh-Tracer-Id: 14039690364763154713 X-Ovh-Remote: 94.23.54.103 (ns3096276.ip-94-23-54.eu) X-Ovh-Local: 213.186.33.20 (ns0.ovh.net) X-OVH-SPAMSTATE: OK X-OVH-SPAMSCORE: -100 X-OVH-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeekiedrudeiucetufdoteggodftvfcurfhrohhfihhlvgemucfqggfjnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeekiedrudeigddvudcutefuodetggdotffvucfrrhhofhhilhgvmecuqfggjfenuceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddm Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Open the memory mapped file with the O_TMPFILE flag when available. Signed-off-by: Mickaël Salaün Cc: Jeff Dike Cc: Richard Weinberger Acked-by: Tristan Schmelcher --- arch/um/os-Linux/mem.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/um/os-Linux/mem.c b/arch/um/os-Linux/mem.c index 840d573..8b17676 100644 --- a/arch/um/os-Linux/mem.c +++ b/arch/um/os-Linux/mem.c @@ -106,6 +106,17 @@ static int __init make_tempfile(const char *template) } } +#ifdef O_TMPFILE + fd = open(tempdir, O_CLOEXEC | O_RDWR | O_EXCL | O_TMPFILE, 0700); + /* + * If the running system does not support O_TMPFILE flag then retry + * without it. + */ + if (fd != -1 || (errno != EINVAL && errno != EISDIR && + errno != EOPNOTSUPP)) + return fd; +#endif + tempname = malloc(strlen(tempdir) + strlen(template) + 1); if (tempname == NULL) return -1; -- 2.6.2