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tomoyo: preparation step for building as a loadable LSM module

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In order to allow Makefile to generate tomoyo.ko as output, rename
tomoyo.c to hooks.h and cut out LSM hook registration part that will be
built into vmlinux from hooks.h to init.c . Also, update comments and
relocate some variables. No behavior changes.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
This commit is contained in:
Tetsuo Handa 2024-09-23 19:00:21 +09:00
parent de5cb0dcb7
commit 268225a1de
6 changed files with 112 additions and 116 deletions
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2
security/tomoyo/Makefile
View File

@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-y = audit.o common.o condition.o domain.o environ.o file.o gc.o group.o load_policy.o memory.o mount.o network.o realpath.o securityfs_if.o tomoyo.o util.o
obj-y = audit.o common.o condition.o domain.o environ.o file.o gc.o group.o init.o load_policy.o memory.o mount.o network.o realpath.o securityfs_if.o util.o
targets += builtin-policy.h

3
security/tomoyo/gc.c
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@ -9,6 +9,9 @@
#include <linux/kthread.h>
#include <linux/slab.h>
/* Lock for GC. */
DEFINE_SRCU(tomoyo_ss);
/**
* tomoyo_memory_free - Free memory for elements.
*

110
security/tomoyo/tomoyo.c → security/tomoyo/hooks.h
View File

@ -1,12 +1,10 @@
// SPDX-License-Identifier: GPL-2.0
/*
* security/tomoyo/tomoyo.c
* security/tomoyo/hooks.h
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include <linux/lsm_hooks.h>
#include <uapi/linux/lsm.h>
#include "common.h"
/**
@ -18,10 +16,6 @@ struct tomoyo_domain_info *tomoyo_domain(void)
{
struct tomoyo_task *s = tomoyo_task(current);
if (s->old_domain_info && !current->in_execve) {
atomic_dec(&s->old_domain_info->users);
s->old_domain_info = NULL;
}
return s->domain_info;
}
@ -62,26 +56,6 @@ static void tomoyo_bprm_committed_creds(const struct linux_binprm *bprm)
s->old_domain_info = NULL;
}
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
/**
* tomoyo_bprm_creds_for_exec - Target for security_bprm_creds_for_exec().
*
* @bprm: Pointer to "struct linux_binprm".
*
* Returns 0.
*/
static int tomoyo_bprm_creds_for_exec(struct linux_binprm *bprm)
{
/*
* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
* for the first time.
*/
if (!tomoyo_policy_loaded)
tomoyo_load_policy(bprm->filename);
return 0;
}
#endif
/**
* tomoyo_bprm_check_security - Target for security_bprm_check().
*
@ -501,10 +475,6 @@ static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
return tomoyo_socket_sendmsg_permission(sock, msg, size);
}
struct lsm_blob_sizes tomoyo_blob_sizes __ro_after_init = {
.lbs_task = sizeof(struct tomoyo_task),
};
/**
* tomoyo_task_alloc - Target for security_task_alloc().
*
@ -543,81 +513,3 @@ static void tomoyo_task_free(struct task_struct *task)
s->old_domain_info = NULL;
}
}
static const struct lsm_id tomoyo_lsmid = {
.name = "tomoyo",
.id = LSM_ID_TOMOYO,
};
/*
* tomoyo_security_ops is a "struct security_operations" which is used for
* registering TOMOYO.
*/
static struct security_hook_list tomoyo_hooks[] __ro_after_init = {
LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare),
LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds),
LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc),
LSM_HOOK_INIT(task_free, tomoyo_task_free),
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
LSM_HOOK_INIT(bprm_creds_for_exec, tomoyo_bprm_creds_for_exec),
#endif
LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security),
LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl),
LSM_HOOK_INIT(file_open, tomoyo_file_open),
LSM_HOOK_INIT(file_truncate, tomoyo_file_truncate),
LSM_HOOK_INIT(path_truncate, tomoyo_path_truncate),
LSM_HOOK_INIT(path_unlink, tomoyo_path_unlink),
LSM_HOOK_INIT(path_mkdir, tomoyo_path_mkdir),
LSM_HOOK_INIT(path_rmdir, tomoyo_path_rmdir),
LSM_HOOK_INIT(path_symlink, tomoyo_path_symlink),
LSM_HOOK_INIT(path_mknod, tomoyo_path_mknod),
LSM_HOOK_INIT(path_link, tomoyo_path_link),
LSM_HOOK_INIT(path_rename, tomoyo_path_rename),
LSM_HOOK_INIT(inode_getattr, tomoyo_inode_getattr),
LSM_HOOK_INIT(file_ioctl, tomoyo_file_ioctl),
LSM_HOOK_INIT(file_ioctl_compat, tomoyo_file_ioctl),
LSM_HOOK_INIT(path_chmod, tomoyo_path_chmod),
LSM_HOOK_INIT(path_chown, tomoyo_path_chown),
LSM_HOOK_INIT(path_chroot, tomoyo_path_chroot),
LSM_HOOK_INIT(sb_mount, tomoyo_sb_mount),
LSM_HOOK_INIT(sb_umount, tomoyo_sb_umount),
LSM_HOOK_INIT(sb_pivotroot, tomoyo_sb_pivotroot),
LSM_HOOK_INIT(socket_bind, tomoyo_socket_bind),
LSM_HOOK_INIT(socket_connect, tomoyo_socket_connect),
LSM_HOOK_INIT(socket_listen, tomoyo_socket_listen),
LSM_HOOK_INIT(socket_sendmsg, tomoyo_socket_sendmsg),
};
/* Lock for GC. */
DEFINE_SRCU(tomoyo_ss);
int tomoyo_enabled __ro_after_init = 1;
/**
* tomoyo_init - Register TOMOYO Linux as a LSM module.
*
* Returns 0.
*/
static int __init tomoyo_init(void)
{
struct tomoyo_task *s = tomoyo_task(current);
/* register ourselves with the security framework */
security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks),
&tomoyo_lsmid);
pr_info("TOMOYO Linux initialized\n");
s->domain_info = &tomoyo_kernel_domain;
atomic_inc(&tomoyo_kernel_domain.users);
s->old_domain_info = NULL;
tomoyo_mm_init();
return 0;
}
DEFINE_LSM(tomoyo) = {
.name = "tomoyo",
.enabled = &tomoyo_enabled,
.flags = LSM_FLAG_LEGACY_MAJOR,
.blobs = &tomoyo_blob_sizes,
.init = tomoyo_init,
};

104
security/tomoyo/init.c Normal file
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@ -0,0 +1,104 @@
// SPDX-License-Identifier: GPL-2.0
/*
* security/tomoyo/init.c
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include <linux/lsm_hooks.h>
#include <uapi/linux/lsm.h>
#include "common.h"
#include "hooks.h"
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
static int tomoyo_bprm_creds_for_exec(struct linux_binprm *bprm)
{
/*
* Load policy if /sbin/tomoyo-init exists and /sbin/init is requested
* for the first time.
*/
if (!tomoyo_policy_loaded)
tomoyo_load_policy(bprm->filename);
return 0;
}
#endif
struct lsm_blob_sizes tomoyo_blob_sizes __ro_after_init = {
.lbs_task = sizeof(struct tomoyo_task),
};
static const struct lsm_id tomoyo_lsmid = {
.name = "tomoyo",
.id = LSM_ID_TOMOYO,
};
/* tomoyo_hooks is used for registering TOMOYO. */
static struct security_hook_list tomoyo_hooks[] __ro_after_init = {
LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare),
LSM_HOOK_INIT(bprm_committed_creds, tomoyo_bprm_committed_creds),
LSM_HOOK_INIT(task_alloc, tomoyo_task_alloc),
LSM_HOOK_INIT(task_free, tomoyo_task_free),
#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
LSM_HOOK_INIT(bprm_creds_for_exec, tomoyo_bprm_creds_for_exec),
#endif
LSM_HOOK_INIT(bprm_check_security, tomoyo_bprm_check_security),
LSM_HOOK_INIT(file_fcntl, tomoyo_file_fcntl),
LSM_HOOK_INIT(file_open, tomoyo_file_open),
LSM_HOOK_INIT(file_truncate, tomoyo_file_truncate),
LSM_HOOK_INIT(path_truncate, tomoyo_path_truncate),
LSM_HOOK_INIT(path_unlink, tomoyo_path_unlink),
LSM_HOOK_INIT(path_mkdir, tomoyo_path_mkdir),
LSM_HOOK_INIT(path_rmdir, tomoyo_path_rmdir),
LSM_HOOK_INIT(path_symlink, tomoyo_path_symlink),
LSM_HOOK_INIT(path_mknod, tomoyo_path_mknod),
LSM_HOOK_INIT(path_link, tomoyo_path_link),
LSM_HOOK_INIT(path_rename, tomoyo_path_rename),
LSM_HOOK_INIT(inode_getattr, tomoyo_inode_getattr),
LSM_HOOK_INIT(file_ioctl, tomoyo_file_ioctl),
LSM_HOOK_INIT(file_ioctl_compat, tomoyo_file_ioctl),
LSM_HOOK_INIT(path_chmod, tomoyo_path_chmod),
LSM_HOOK_INIT(path_chown, tomoyo_path_chown),
LSM_HOOK_INIT(path_chroot, tomoyo_path_chroot),
LSM_HOOK_INIT(sb_mount, tomoyo_sb_mount),
LSM_HOOK_INIT(sb_umount, tomoyo_sb_umount),
LSM_HOOK_INIT(sb_pivotroot, tomoyo_sb_pivotroot),
LSM_HOOK_INIT(socket_bind, tomoyo_socket_bind),
LSM_HOOK_INIT(socket_connect, tomoyo_socket_connect),
LSM_HOOK_INIT(socket_listen, tomoyo_socket_listen),
LSM_HOOK_INIT(socket_sendmsg, tomoyo_socket_sendmsg),
};
int tomoyo_enabled __ro_after_init = 1;
/* Has /sbin/init started? */
bool tomoyo_policy_loaded;
/**
* tomoyo_init - Register TOMOYO Linux as a LSM module.
*
* Returns 0.
*/
static int __init tomoyo_init(void)
{
struct tomoyo_task *s = tomoyo_task(current);
/* register ourselves with the security framework */
security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks),
&tomoyo_lsmid);
pr_info("TOMOYO Linux initialized\n");
s->domain_info = &tomoyo_kernel_domain;
atomic_inc(&tomoyo_kernel_domain.users);
s->old_domain_info = NULL;
tomoyo_mm_init();
return 0;
}
DEFINE_LSM(tomoyo) = {
.name = "tomoyo",
.enabled = &tomoyo_enabled,
.flags = LSM_FLAG_LEGACY_MAJOR,
.blobs = &tomoyo_blob_sizes,
.init = tomoyo_init,
};

6
security/tomoyo/securityfs_if.c
View File

@ -229,11 +229,11 @@ static void __init tomoyo_create_entry(const char *name, const umode_t mode,
}
/**
* tomoyo_initerface_init - Initialize /sys/kernel/security/tomoyo/ interface.
* tomoyo_interface_init - Initialize /sys/kernel/security/tomoyo/ interface.
*
* Returns 0.
*/
static int __init tomoyo_initerface_init(void)
static int __init tomoyo_interface_init(void)
{
struct tomoyo_domain_info *domain;
struct dentry *tomoyo_dir;
@ -270,4 +270,4 @@ static int __init tomoyo_initerface_init(void)
return 0;
}
fs_initcall(tomoyo_initerface_init);
fs_initcall(tomoyo_interface_init);

3
security/tomoyo/util.c
View File

@ -13,9 +13,6 @@
/* Lock for protecting policy. */
DEFINE_MUTEX(tomoyo_policy_lock);
/* Has /sbin/init started? */
bool tomoyo_policy_loaded;
/*
* Mapping table from "enum tomoyo_mac_index" to
* "enum tomoyo_mac_category_index".