Commit 65aafb1e authored by Stéphane Graber's avatar Stéphane Graber Committed by Linus Torvalds
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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: default avatarStéphane Graber <>
Reported-by: default avatarHans Feldt <>
Cc: Alexander Viro <>
Cc: Eric W. Biederman <>
Cc: Andy Whitcroft <>
Acked-by: default avatarSerge E. Hallyn <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 73af963f
......@@ -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
......@@ -190,6 +190,11 @@ static int format_corename(struct core_name *cn, struct coredump_params *cprm)
err = cn_printf(cn, "%d",
/* global pid */
case 'P':
err = cn_printf(cn, "%d",
/* uid */
case 'u':
err = cn_printf(cn, "%d", cred->uid);
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