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Commit 656eb2cd authored by Roland McGrath's avatar Roland McGrath Committed by Linus Torvalds
Browse files

add CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 



This adds a kconfig option to change the /proc/PID/coredump_filter default.
Fedora has been carrying a trivial patch to change the hard-wired value for
this default, since Fedora 8.  The default default can't change safely
because there are old GDB versions out there (all before 6.7) that are
confused by the core dump files created by the MMF_DUMP_ELF_HEADERS setting.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Michael Kerrisk <mtk.manpages@googlemail.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Kawai Hidehiro <hidehiro.kawai.ez@hitachi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: David Jones <davej@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6409324b

fs/Kconfig.binfmt

+22 −0
Original line number Diff line number Diff line
@@ -40,6 +40,28 @@ config BINFMT_ELF_FDPIC 


	  It is also possible to run FDPIC ELF binaries on MMU linux also.



config CORE_DUMP_DEFAULT_ELF_HEADERS

	bool "Write ELF core dumps with partial segments"

	default n

	depends on BINFMT_ELF

	help

	  ELF core dump files describe each memory mapping of the crashed

	  process, and can contain or omit the memory contents of each one.

	  The contents of an unmodified text mapping are omitted by default.



	  For an unmodified text mapping of an ELF object, including just

	  the first page of the file in a core dump makes it possible to

	  identify the build ID bits in the file, without paying the i/o

	  cost and disk space to dump all the text.  However, versions of

	  GDB before 6.7 are confused by ELF core dump files in this format.



	  The core dump behavior can be controlled per process using

	  the /proc/PID/coredump_filter pseudo-file; this setting is

	  inherited.  See Documentation/filesystems/proc.txt for details.



	  This config option changes the default setting of coredump_filter

	  seen at boot time.  If unsure, say N.



config BINFMT_FLAT

	bool "Kernel support for flat binaries"

	depends on !MMU && (!FRV || BROKEN)

include/linux/sched.h

+7 −1
Original line number Diff line number Diff line
@@ -411,7 +411,13 @@ extern int get_dumpable(struct mm_struct *mm); 
	(((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) |\

	 (1 << MMF_DUMP_HUGETLB_PRIVATE))

	 (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF)



#ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS

# define MMF_DUMP_MASK_DEFAULT_ELF	(1 << MMF_DUMP_ELF_HEADERS)

#else

# define MMF_DUMP_MASK_DEFAULT_ELF	0

#endif



struct sighand_struct {

	atomic_t		count;