From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?iso-8859-1?Q?St=E9phane?= Graber Subject: [RESEND] [PATCH] coredump: Add new %P variable in core_pattern Date: Thu, 15 Aug 2013 14:51:32 +0200 Message-ID: <20130815125132.GA11139@castiana> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: linux-fsdevel@vger.kernel.org, Alexander Viro , "Eric W. Biederman" , Serge Hallyn , Andy Whitcroft To: linux-kernel@vger.kernel.org Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org This adds a new %P variable to be used in core_pattern. This variable c= ontains the global PID (PID in the init namespace) as %p contains the PID in th= e current namespace which isn't always what we want. The main use for this is to make it easier to handle crashes that happe= ned within a container. With that new variables it's possible to have the c= rashes 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: Andy Whitcroft Acked-by: Serge E. Hallyn Signed-off-by: St=E9phane 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/ker= nel.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 pat= tern 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, s= truct coredump_params *cprm) err =3D cn_printf(cn, "%d", task_tgid_vnr(current)); break; + /* global pid */ + case 'P': + err =3D cn_printf(cn, "%d", + task_tgid_nr(current)); + break; /* uid */ case 'u': err =3D cn_printf(cn, "%d", cred->uid); --=20 1.8.1.2