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	Original line	Diff line number	Diff line
	@@ -182,6 +182,7 @@ core_pattern is used to specify a core dumpfile pattern name.
	%<NUL> '%' is dropped		%<NUL> '%' is dropped
	%% output one '%'		%% output one '%'
	%p pid		%p pid
			%P global pid (init PID namespace)
	%u uid		%u uid
	%g gid		%g gid
	%d dump mode, matches PR_SET_DUMPABLE and		%d dump mode, matches PR_SET_DUMPABLE and

fs/coredump.c

+5 −0

Original line number	Original line	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",		err = cn_printf(cn, "%d",
	task_tgid_vnr(current));		task_tgid_vnr(current));
	break;		break;
			/* global pid */
			case 'P':
			err = cn_printf(cn, "%d",
			task_tgid_nr(current));
			break;
	/* uid */		/* uid */
	case 'u':		case 'u':
	err = cn_printf(cn, "%d", cred->uid);		err = cn_printf(cn, "%d", cred->uid);