linux-kernel - [PATCH] coredump: Add new %P variable in core

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Message-Id: <1366845347-4532-1-git-send-email-stgraber@ubuntu.com>
Date:	Thu, 25 Apr 2013 01:15:47 +0200
From:	Stéphane Graber <stgraber@...ntu.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org,
	Stéphane Graber <stgraber@...ntu.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: [PATCH] coredump: Add new %P variable in core_pattern

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 <hans.feldt@...csson.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@...ssion.com>
Cc: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Stéphane Graber <stgraber@...ntu.com>
---
 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.
 	%<NUL>	'%' 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

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