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LSM: Convert from initcall to struct lsm_info

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In preparation for doing more interesting LSM init probing, this converts
the existing initcall system into an explicit call into a function pointer
from a section-collected struct lsm_info array.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Reviewed-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
This commit is contained in:
Kees Cook 2018-10-10 17:18:21 -07:00 • committed by James Morris
parent 6907e3746f
commit 5b89c1bd4c
5 changed files with 18 additions and 12 deletions
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2
include/linux/init.h
View file

@ -133,7 +133,6 @@ static inline initcall_t initcall_from_entry(initcall_entry_t *entry)
#endif #endif
extern initcall_entry_t __con_initcall_start[], __con_initcall_end[]; extern initcall_entry_t __con_initcall_start[], __con_initcall_end[];
extern initcall_entry_t __start_lsm_info[], __end_lsm_info[];
/* Used for contructor calls. */ /* Used for contructor calls. */
typedef void (*ctor_fn_t)(void); typedef void (*ctor_fn_t)(void);
@ -236,7 +235,6 @@ extern bool initcall_debug;
static exitcall_t __exitcall_##fn __exit_call = fn static exitcall_t __exitcall_##fn __exit_call = fn
#define console_initcall(fn) ___define_initcall(fn,, .con_initcall) #define console_initcall(fn) ___define_initcall(fn,, .con_initcall)
#define security_initcall(fn) ___define_initcall(fn,, .lsm_info)
struct obs_kernel_param { struct obs_kernel_param {
const char *str; const char *str;

12
include/linux/lsm_hooks.h
View file

@ -2039,6 +2039,18 @@ extern char *lsm_names;
extern void security_add_hooks(struct security_hook_list *hooks, int count, extern void security_add_hooks(struct security_hook_list *hooks, int count,
char *lsm); char *lsm);
struct lsm_info {
int (*init)(void); /* Required. */
};
extern struct lsm_info __start_lsm_info[], __end_lsm_info[];
#define security_initcall(lsm) \
static struct lsm_info __lsm_##lsm \
__used __section(.lsm_info.init) \
__aligned(sizeof(unsigned long)) \
= { .init = lsm, }
#ifdef CONFIG_SECURITY_SELINUX_DISABLE #ifdef CONFIG_SECURITY_SELINUX_DISABLE
/* /*
* Assuring the safety of deleting a security module is up to * Assuring the safety of deleting a security module is up to

1
include/linux/module.h
View file

@ -123,7 +123,6 @@ extern void cleanup_module(void);
#define late_initcall_sync(fn) module_init(fn) #define late_initcall_sync(fn) module_init(fn)
#define console_initcall(fn) module_init(fn) #define console_initcall(fn) module_init(fn)
#define security_initcall(fn) module_init(fn)
/* Each module must use one module_init(). */ /* Each module must use one module_init(). */
#define module_init(initfn) \ #define module_init(initfn) \

1
security/integrity/iint.c
View file

@ -22,6 +22,7 @@
#include <linux/file.h> #include <linux/file.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/security.h> #include <linux/security.h>
#include <linux/lsm_hooks.h>
#include "integrity.h" #include "integrity.h"
static struct rb_root integrity_iint_tree = RB_ROOT; static struct rb_root integrity_iint_tree = RB_ROOT;

14
security/security.c
View file

@ -43,16 +43,12 @@ char *lsm_names;
static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] = static __initdata char chosen_lsm[SECURITY_NAME_MAX + 1] =
CONFIG_DEFAULT_SECURITY; CONFIG_DEFAULT_SECURITY;
static void __init do_security_initcalls(void) static void __init major_lsm_init(void)
{ {
initcall_t call; struct lsm_info *lsm;
initcall_entry_t *ce;
ce = __start_lsm_info; for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
while (ce < __end_lsm_info) { lsm->init();
call = initcall_from_entry(ce);
call();
ce++;
} }
} }
@ -82,7 +78,7 @@ int __init security_init(void)
/* /*
* Load all the remaining security modules. * Load all the remaining security modules.
*/ */
do_security_initcalls(); major_lsm_init();
return 0; return 0;
} }