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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.

[akpm@linux-foundation.org: fix binfmt_aout.c build]
Signed-off-by: Alex Kelly <alex.page.kelly@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Kelly 2012-10-04 17:15:23 -07:00 • committed by Linus Torvalds
parent db9aeca97a
commit 046d662f48
6 changed files with 53 additions and 27 deletions
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4
include/linux/binfmts.h
View file

@ -132,7 +132,11 @@ extern int copy_strings_kernel(int argc, const char *const *argv,
struct linux_binprm *bprm);
extern int prepare_bprm_creds(struct linux_binprm *bprm);
extern void install_exec_creds(struct linux_binprm *bprm);
#ifdef CONFIG_COREDUMP
extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
#else
static inline void do_coredump(long signr, int exit_code, struct pt_regs *regs) {}
#endif
extern void set_binfmt(struct linux_binfmt *new);
extern void free_bprm(struct linux_binprm *);