Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755026Ab3J3Tvd (ORCPT ); Wed, 30 Oct 2013 15:51:33 -0400 Received: from smtpfb2-g21.free.fr ([212.27.42.10]:48837 "EHLO smtpfb2-g21.free.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755001Ab3J3Tva (ORCPT ); Wed, 30 Oct 2013 15:51:30 -0400 From: Yann Droneaud To: Peter Zijlstra , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo Cc: Yann Droneaud , linux-kernel@vger.kernel.org Subject: [PATCH v4 6/7] events: use get_unused_fd_flags(0) instead of get_unused_fd() Date: Wed, 30 Oct 2013 20:47:46 +0100 Message-Id: <3b0bc009ff1410d04f8a1e71bfae0d27e1254b90.1383121137.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: 1688 Lines: 47 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.1383121137.git.ydroneaud@opteya.com --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 354a59c..142d13c 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6970,7 +6970,7 @@ SYSCALL_DEFINE5(perf_event_open, if ((flags & PERF_FLAG_PID_CGROUP) && (pid == -1 || cpu == -1)) return -EINVAL; - event_fd = get_unused_fd(); + event_fd = get_unused_fd_flags(0); if (event_fd < 0) return event_fd; -- 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/