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security: Support early LSMs

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The lockdown module is intended to allow for kernels to be locked down
early in boot - sufficiently early that we don't have the ability to
kmalloc() yet. Add support for early initialisation of some LSMs, and
then add them to the list of names when we do full initialisation later.
Early LSMs are initialised in link order and cannot be overridden via
boot parameters, and cannot make use of kmalloc() (since the allocator
isn't initialised yet).

(Fixed by Stephen Rothwell to include a stub to fix builds when
!CONFIG_SECURITY)

Signed-off-by: Matthew Garrett <mjg59@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Matthew Garrett
2019-08-19 17:17:37 -07:00
committed by James Morris
parent 0ecfebd2b5
commit e6b1db98cf
5 changed files with 62 additions and 9 deletions
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6
include/linux/security.h
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@@ -195,6 +195,7 @@ int unregister_lsm_notifier(struct notifier_block *nb);
/* prototypes */
extern int security_init(void);
extern int early_security_init(void);
/* Security operations */
int security_binder_set_context_mgr(struct task_struct *mgr);
@@ -423,6 +424,11 @@ static inline int security_init(void)
return 0;
}
static inline int early_security_init(void)
{
return 0;
}
static inline int security_binder_set_context_mgr(struct task_struct *mgr)
{
return 0;