Commit 4cb0e11b authored by Hidehiro Kawai's avatar Hidehiro Kawai Committed by Linus Torvalds
Browse files

coredump_filter: permit changing of the default filter 



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: default avatarHidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9cd4fd10

Documentation/kernel-parameters.txt

+5 −0
Original line number Diff line number Diff line
@@ -551,6 +551,11 @@ and is between 256 and 4096 characters. It is defined in the file 
			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>]

kernel/fork.c

+13 −2
Original line number Diff line number Diff line
@@ -400,6 +400,18 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock); 
#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)
@@ -408,8 +420,7 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p) 
	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);

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