coredump: make core dump functionality optional
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>
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index d146e18..4b5b511 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -32,31 +32,8 @@
static int load_aout_binary(struct linux_binprm *, struct pt_regs * regs);
static int load_aout_library(struct file*);
-static int aout_core_dump(struct coredump_params *cprm);
-static struct linux_binfmt aout_format = {
- .module = THIS_MODULE,
- .load_binary = load_aout_binary,
- .load_shlib = load_aout_library,
- .core_dump = aout_core_dump,
- .min_coredump = PAGE_SIZE
-};
-
-#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
-
-static int set_brk(unsigned long start, unsigned long end)
-{
- start = PAGE_ALIGN(start);
- end = PAGE_ALIGN(end);
- if (end > start) {
- unsigned long addr;
- addr = vm_brk(start, end - start);
- if (BAD_ADDR(addr))
- return addr;
- }
- return 0;
-}
-
+#ifdef CONFIG_COREDUMP
/*
* Routine writes a core dump image in the current directory.
* Currently only a stub-function.
@@ -66,7 +43,6 @@
* field, which also makes sure the core-dumps won't be recursive if the
* dumping of the process results in another error..
*/
-
static int aout_core_dump(struct coredump_params *cprm)
{
struct file *file = cprm->file;
@@ -135,6 +111,32 @@
set_fs(fs);
return has_dumped;
}
+#else
+#define aout_core_dump NULL
+#endif
+
+static struct linux_binfmt aout_format = {
+ .module = THIS_MODULE,
+ .load_binary = load_aout_binary,
+ .load_shlib = load_aout_library,
+ .core_dump = aout_core_dump,
+ .min_coredump = PAGE_SIZE
+};
+
+#define BAD_ADDR(x) ((unsigned long)(x) >= TASK_SIZE)
+
+static int set_brk(unsigned long start, unsigned long end)
+{
+ start = PAGE_ALIGN(start);
+ end = PAGE_ALIGN(end);
+ if (end > start) {
+ unsigned long addr;
+ addr = vm_brk(start, end - start);
+ if (BAD_ADDR(addr))
+ return addr;
+ }
+ return 0;
+}
/*
* create_aout_tables() parses the env- and arg-strings in new user