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authorKawai, Hidehiro <hidehiro.kawai.ez@hitachi.com>2007-07-19 01:48:28 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:47 -0700
commit3cb4a0bb1e773e3c41800b33a3f7dab32bd06c64 (patch)
treed363522865706f0674b7b104a8fc7b151f336764 /include/linux
parent6c5d523826dc639df709ed0f88c5d2ce25379652 (diff)
coredump masking: add an interface for core dump filter
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8dbd0836640..94f624aef01 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -349,8 +349,22 @@ extern void set_dumpable(struct mm_struct *mm, int value);
extern int get_dumpable(struct mm_struct *mm);
/* mm flags */
+/* dumpable bits */
#define MMF_DUMPABLE 0 /* core dump is permitted */
#define MMF_DUMP_SECURELY 1 /* core file is readable only by root */
+#define MMF_DUMPABLE_BITS 2
+
+/* coredump filter bits */
+#define MMF_DUMP_ANON_PRIVATE 2
+#define MMF_DUMP_ANON_SHARED 3
+#define MMF_DUMP_MAPPED_PRIVATE 4
+#define MMF_DUMP_MAPPED_SHARED 5
+#define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS
+#define MMF_DUMP_FILTER_BITS 4
+#define MMF_DUMP_FILTER_MASK \
+ (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT)
+#define MMF_DUMP_FILTER_DEFAULT \
+ ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED))
struct mm_struct {
struct vm_area_struct * mmap; /* list of VMAs */