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

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Date:	Wed, 24 Apr 2013 18:48:13 -0500
From:	Serge Hallyn <serge.hallyn@...ntu.com>
To:	Stéphane Graber <stgraber@...ntu.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH] coredump: Add new %P variable in core_pattern

Quoting Stéphane Graber (stgraber@...ntu.com):
> 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>

Thanks, Stéphane.

Acked-by: Serge E. Hallyn <serge.hallyn@...ntu.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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