Commit 65aafb1e authored Sep 11, 2013 by Stéphane Graber Committed by Linus Torvalds Sep 11, 2013

coredump: add new %P variable in core_pattern



Add 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).

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
Reported-by: Hans Feldt <hans.feldt@ericsson.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Andy Whitcroft <apw@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 73af963f

Documentation/sysctl/kernel.txt

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

fs/coredump.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -190,6 +190,11 @@ 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);

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