From 65aafb1e7484b7434a0c1d4c593191ebe5776a2f Mon Sep 17 00:00:00 2001 From: =?utf8?q?St=C3=A9phane=20Graber?= Date: Wed, 11 Sep 2013 14:24:32 -0700 Subject: [PATCH] coredump: add new %P variable in core_pattern MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reported-by: Hans Feldt Cc: Alexander Viro Cc: Eric W. Biederman Cc: Andy Whitcroft Acked-by: Serge E. Hallyn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 ab7d16efa96b..9d4c1d18ad44 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. % '%' 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 72f816d6cad9..9bdeca12ae0e 100644 --- a/fs/coredump.c +++ b/fs/coredump.c @@ -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); -- 2.20.1