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authorRoland McGrath <roland@redhat.com>2008-10-18 20:28:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:52:39 -0700
commit656eb2cd5da153762f2e8419ca117ce12ef522c3 (patch)
tree251246495ba930296590c644bdfbbce996bba69e /fs/Kconfig.binfmt
parent6409324b385f3f63a03645b4422e3be67348d922 (diff)
downloadlwn-656eb2cd5da153762f2e8419ca117ce12ef522c3.tar.gz
lwn-656eb2cd5da153762f2e8419ca117ce12ef522c3.zip
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: Roland 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/Kconfig.binfmt')
-rw-r--r--fs/Kconfig.binfmt22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/Kconfig.binfmt b/fs/Kconfig.binfmt
index 801db1341811..ce9fb3fbfae4 100644
--- a/fs/Kconfig.binfmt
+++ b/fs/Kconfig.binfmt
@@ -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)