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coredump_filter: permit changing of the default filter

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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@hitachi.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hidehiro Kawai 2009-01-06 14:42:47 -08:00 committed by Linus Torvalds
parent 9cd4fd1043
commit 4cb0e11b15
2 changed files with 18 additions and 2 deletions
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5
Documentation/kernel-parameters.txt
View File

@ -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 not work reliably with all consoles, but is known
to work with serial and VGA consoles. 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 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
Format: Format:
<first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>] <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]

15
kernel/fork.c
View File

@ -400,6 +400,18 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(mmlist_lock);
#define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL)) #define allocate_mm() (kmem_cache_alloc(mm_cachep, GFP_KERNEL))
#define free_mm(mm) (kmem_cache_free(mm_cachep, (mm))) #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> #include <linux/init_task.h>
static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p) 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); atomic_set(&mm->mm_count, 1);
init_rwsem(&mm->mmap_sem); init_rwsem(&mm->mmap_sem);
INIT_LIST_HEAD(&mm->mmlist); INIT_LIST_HEAD(&mm->mmlist);
mm->flags = (current->mm) ? current->mm->flags mm->flags = (current->mm) ? current->mm->flags : default_dump_filter;
: MMF_DUMP_FILTER_DEFAULT;
mm->core_state = NULL; mm->core_state = NULL;
mm->nr_ptes = 0; mm->nr_ptes = 0;
set_mm_counter(mm, file_rss, 0); set_mm_counter(mm, file_rss, 0);