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coredump masking: add an interface for core dump filter

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This patch adds an interface to set/reset flags which determines each memory
segment should be dumped or not when a core file is generated.

/proc/<pid>/coredump_filter file is provided to access the flags.  You can
change the flag status for a particular process by writing to or reading from
the file.

The flag status is inherited to the child process when it is created.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kawai, Hidehiro 2007-07-19 01:48:28 -07:00 • committed by Linus Torvalds
parent 6c5d523826
commit 3cb4a0bb1e
3 changed files with 105 additions and 0 deletions
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2
kernel/fork.c
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@ -334,6 +334,8 @@ static struct mm_struct * mm_init(struct mm_struct * mm)
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->core_waiters = 0;
mm->nr_ptes = 0;
set_mm_counter(mm, file_rss, 0);