The patch titled
coredump_filter: permit changing of the default filter
has been added to the -mm tree. Its filename is
coredump_filter-permit-changing-of-the-default-filter.patch
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------------------------------------------------------
Subject: coredump_filter: permit changing of the default filter
From: Hidehiro Kawai <hidehiro.kawai.ez@xxxxxxxxxxx>
Introduce a new kernel parameter `coredump_filter'. Setting a value to
this parameter causes the default bitmask of coredump_filter to be
changed.
It is useful for users to change coredump_filter settings for the whole
system at boot time. Without this parameter, users have to change
coredump_filter settings for each /proc/<pid>/ in an initializing script.
Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@xxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 5 +++++
kernel/fork.c | 15 +++++++++++++--
2 files changed, 18 insertions(+), 2 deletions(-)
diff -puN Documentation/kernel-parameters.txt~coredump_filter-permit-changing-of-the-default-filter Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~coredump_filter-permit-changing-of-the-default-filter
+++ a/Documentation/kernel-parameters.txt
@@ -556,6 +556,11 @@ and is between 256 and 4096 characters.
not work reliably with all consoles, but is known
to work with serial and VGA consoles.
+ coredump_filter=
+ [KNL] Change the default value for
+ /proc/<pid>/coredump_filter.
+ See also Documentation/filesystems/proc.txt.
+
cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
Format:
<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
diff -puN kernel/fork.c~coredump_filter-permit-changing-of-the-default-filter kernel/fork.c
--- a/kernel/fork.c~coredump_filter-permit-changing-of-the-default-filter
+++ a/kernel/fork.c
@@ -405,6 +405,18 @@ __cacheline_aligned_in_smp DEFINE_SPINLO
#define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL))
#define free_mm(mm) (kmem_cache_free(mm_cachep, (mm)))
+static unsigned long default_dump_filter = MMF_DUMP_FILTER_DEFAULT;
+
+static int __init coredump_filter_setup(char *s)
+{
+ default_dump_filter =
+ (simple_strtoul(s, NULL, 0) << MMF_DUMP_FILTER_SHIFT) &
+ MMF_DUMP_FILTER_MASK;
+ return 1;
+}
+
+__setup("coredump_filter=", coredump_filter_setup);
+
#include <linux/init_task.h>
static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
@@ -413,8 +425,7 @@ static struct mm_struct * mm_init(struct
atomic_set(&mm->mm_count, 1);
init_rwsem(&mm->mmap_sem);
INIT_LIST_HEAD(&mm->mmlist);
- mm->flags = (current->mm) ? current->mm->flags
- : MMF_DUMP_FILTER_DEFAULT;
+ mm->flags = (current->mm) ? current->mm->flags : default_dump_filter;
mm->core_state = NULL;
mm->nr_ptes = 0;
set_mm_counter(mm, file_rss, 0);
_
Patches currently in -mm which might be from hidehiro.kawai.ez@xxxxxxxxxxx are
coredump_filter-permit-changing-of-the-default-filter.patch
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