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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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3
fs/Makefile
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@ -11,7 +11,7 @@ obj-y := open.o read_write.o file_table.o super.o \
attr.o bad_inode.o file.o filesystems.o namespace.o \
seq_file.o xattr.o libfs.o fs-writeback.o \
pnode.o drop_caches.o splice.o sync.o utimes.o \
stack.o fs_struct.o statfs.o coredump.o
stack.o fs_struct.o statfs.o
ifeq ($(CONFIG_BLOCK),y)
obj-y += buffer.o bio.o block_dev.o direct-io.o mpage.o ioprio.o
@ -48,6 +48,7 @@ obj-$(CONFIG_FS_MBCACHE) += mbcache.o
obj-$(CONFIG_FS_POSIX_ACL) += posix_acl.o xattr_acl.o
obj-$(CONFIG_NFS_COMMON) += nfs_common/
obj-$(CONFIG_GENERIC_ACL) += generic_acl.o
obj-$(CONFIG_COREDUMP) += coredump.o
obj-$(CONFIG_FHANDLE) += fhandle.o