Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758631Ab3DXXYP (ORCPT ); Wed, 24 Apr 2013 19:24:15 -0400 Received: from vorash.stgraber.org ([176.9.111.221]:46645 "EHLO smtpout.stgraber.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757971Ab3DXXYO (ORCPT ); Wed, 24 Apr 2013 19:24:14 -0400 X-Greylist: delayed 460 seconds by postgrey-1.27 at vger.kernel.org; Wed, 24 Apr 2013 19:24:13 EDT From: =?UTF-8?q?St=C3=A9phane=20Graber?= To: linux-kernel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, =?UTF-8?q?St=C3=A9phane=20Graber?= , Alexander Viro , "Eric W. Biederman" , Serge Hallyn Subject: [PATCH] coredump: Add new %P variable in core_pattern Date: Thu, 25 Apr 2013 01:15:47 +0200 Message-Id: <1366845347-4532-1-git-send-email-stgraber@ubuntu.com> X-Mailer: git-send-email 1.8.1.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1978 Lines: 55 This adds a new %P variable to be used in core_pattern. This variable contains the global PID (PID in the init namespace) as %p contains the PID in the current namespace which isn't always what we want. The main use for this is to make it easier to handle crashes that happened within a container. With that new variables it's possible to have the crashes dumped into the container or forwarded to the host with the right PID (from the host's point of view). Reported-by: Hans Feldt Cc: Alexander Viro Cc: Eric W. Biederman Cc: Serge Hallyn Signed-off-by: Stéphane Graber --- Documentation/sysctl/kernel.txt | 1 + fs/coredump.c | 5 +++++ 2 files changed, 6 insertions(+) diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index ccd4258..833026d 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -182,6 +182,7 @@ core_pattern is used to specify a core dumpfile pattern name. % '%' is dropped %% output one '%' %p pid + %P global pid (init PID namespace) %u uid %g gid %d dump mode, matches PR_SET_DUMPABLE and diff --git a/fs/coredump.c b/fs/coredump.c index c647965..528c6fc 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -186,6 +186,11 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm) err = cn_printf(cn, "%d", task_tgid_vnr(current)); break; + /* global pid */ + case 'P': + err = cn_printf(cn, "%d", + task_tgid_nr(current)); + break; /* uid */ case 'u': err = cn_printf(cn, "%d", cred->uid); -- 1.8.1.2 -- 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/