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coredump: make core dump functionality optional

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Adds an expert Kconfig option, CONFIG_COREDUMP, which allows disabling of
core dump.  This saves approximately 2.6k in the compiled kernel, and
complements CONFIG_ELF_CORE, which now depends on it.

CONFIG_COREDUMP also disables coredump-related sysctls, except for
suid_dumpable and related functions, which are necessary for ptrace.

[[email protected]: fix binfmt_aout.c build]
Signed-off-by: Alex Kelly <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Acked-by: Kees Cook <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alex Kelly 2012-10-04 17:15:23 -07:00 • committed by Linus Torvalds
commit 046d662f48
6 changed files with 53 additions and 27 deletions
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8
fs/Kconfig.binfmt
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@ -164,3 +164,11 @@ config BINFMT_MISC
You may say M here for module support and later load the module when
you have use for it; the module is called binfmt_misc. If you
don't know what to answer at this point, say Y.
config COREDUMP
bool "Enable core dump support" if EXPERT
default y
help
This option enables support for performing core dumps. You almost
certainly want to say Y here. Not necessary on systems that never
need debugging or only ever run flawless code.