mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 01:34:00 +08:00
385975dca5
Process's credentials point to a Landlock domain, which is underneath implemented with a ruleset. In the following commits, this domain is used to check and enforce the ptrace and filesystem security policies. A domain is inherited from a parent to its child the same way a thread inherits a seccomp policy. Cc: James Morris <jmorris@namei.org> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com> Reviewed-by: Jann Horn <jannh@google.com> Acked-by: Serge Hallyn <serge@hallyn.com> Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210422154123.13086-4-mic@digikod.net Signed-off-by: James Morris <jamorris@linux.microsoft.com>
47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Landlock LSM - Credential hooks
|
|
*
|
|
* Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
|
|
* Copyright © 2018-2020 ANSSI
|
|
*/
|
|
|
|
#include <linux/cred.h>
|
|
#include <linux/lsm_hooks.h>
|
|
|
|
#include "common.h"
|
|
#include "cred.h"
|
|
#include "ruleset.h"
|
|
#include "setup.h"
|
|
|
|
static int hook_cred_prepare(struct cred *const new,
|
|
const struct cred *const old, const gfp_t gfp)
|
|
{
|
|
struct landlock_ruleset *const old_dom = landlock_cred(old)->domain;
|
|
|
|
if (old_dom) {
|
|
landlock_get_ruleset(old_dom);
|
|
landlock_cred(new)->domain = old_dom;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void hook_cred_free(struct cred *const cred)
|
|
{
|
|
struct landlock_ruleset *const dom = landlock_cred(cred)->domain;
|
|
|
|
if (dom)
|
|
landlock_put_ruleset_deferred(dom);
|
|
}
|
|
|
|
static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
|
|
LSM_HOOK_INIT(cred_prepare, hook_cred_prepare),
|
|
LSM_HOOK_INIT(cred_free, hook_cred_free),
|
|
};
|
|
|
|
__init void landlock_add_cred_hooks(void)
|
|
{
|
|
security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
|
|
LANDLOCK_NAME);
|
|
}
|