Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757400Ab3HONMr (ORCPT ); Thu, 15 Aug 2013 09:12:47 -0400 Received: from smtp3-g21.free.fr ([212.27.42.3]:34292 "EHLO smtp3-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757669Ab3HONMo (ORCPT ); Thu, 15 Aug 2013 09:12:44 -0400 From: Yann Droneaud To: Alex Williamson Cc: Yann Droneaud , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 05/10] vfio: use get_unused_fd_flags(0) instead of get_unused_fd() Date: Thu, 15 Aug 2013 15:10:55 +0200 Message-Id: <613180f8dafa1143cc4f71405b0c1eba8d523000.1376327678.git.ydroneaud@opteya.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1797 Lines: 48 Macro get_unused_fd() is used to allocate a file descriptor with default flags. Those default flags (0) can be "unsafe": O_CLOEXEC must be used by default to not leak file descriptor across exec(). Instead of macro get_unused_fd(), functions anon_inode_getfd() or get_unused_fd_flags() should be used with flags given by userspace. If not possible, flags should be set to O_CLOEXEC to provide userspace with a default safe behavor. In a further patch, get_unused_fd() will be removed so that new code start using anon_inode_getfd() or get_unused_fd_flags() with correct flags. This patch replaces calls to get_unused_fd() with equivalent call to get_unused_fd_flags(0) to preserve current behavor for existing code. The hard coded flag value (0) should be reviewed on a per-subsystem basis, and, if possible, set to O_CLOEXEC. Signed-off-by: Yann Droneaud Link: http://lkml.kernel.org/r/cover.1376327678.git.ydroneaud@opteya.com --- drivers/vfio/vfio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c index d3cb342..75c16cc 100644 --- a/drivers/vfio/vfio.c +++ b/drivers/vfio/vfio.c @@ -1109,7 +1109,7 @@ static int vfio_group_get_device_fd(struct vfio_group *group, char *buf) * We can't use anon_inode_getfd() because we need to modify * the f_mode flags directly to allow more than just ioctls */ - ret = get_unused_fd(); + ret = get_unused_fd_flags(0); if (ret < 0) { device->ops->release(device->device_data); break; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/