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One bugfix patch, one preparation patch, and one conversion patch.

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TOMOYO is useful as an analysis tool for learning how a Linux system works.
 My boss was hoping that SELinux's policy is generated from what TOMOYO has
 observed. A translated paper describing it is available at
 https://master.dl.sourceforge.net/project/tomoyo/docs/nsf2003-en.pdf/nsf2003-en.pdf?viasf=1 .
 Although that attempt failed due to mapping problem between inode and pathname,
 TOMOYO remains as an access restriction tool due to ability to write custom
 policy by individuals.
 
 I was delivering pure LKM version of TOMOYO (named AKARI) to users who
 cannot afford rebuilding their distro kernels with TOMOYO enabled. But
 since the LSM framework was converted to static calls, it became more
 difficult to deliver AKARI to such users. Therefore, I decided to update
 TOMOYO so that people can use mostly LKM version of TOMOYO with minimal
 burden for both distributors and users.
 
 Tetsuo Handa (3):
   tomoyo: preparation step for building as a loadable LSM module
   tomoyo: allow building as a loadable LSM module
   tomoyo: fallback to realpath if symlink's pathname does not exist
 
  security/tomoyo/Kconfig         |   15 ++++++++
  security/tomoyo/Makefile        |   10 ++++-
  security/tomoyo/common.c        |   14 ++++++-
  security/tomoyo/common.h        |   72 ++++++++++++++++++++++++++++++++++++++
  security/tomoyo/domain.c        |    9 +++-
  security/tomoyo/gc.c            |    3 +
  security/tomoyo/hooks.h         |  110 -----------------------------------------------------------
  security/tomoyo/init.c          |  366 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  security/tomoyo/load_policy.c   |   12 ++++++
  security/tomoyo/proxy.c         |   82 ++++++++++++++++++++++++++++++++++++++++++++
  security/tomoyo/securityfs_if.c |   12 ++++--
  security/tomoyo/util.c          |    3 -
  12 files changed, 585 insertions(+), 123 deletions(-)
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Merge tag 'tomoyo-pr-20240927' of git://git.code.sf.net/p/tomoyo/tomoyo

Pull tomoyo updates from Tetsuo Handa:
 "One bugfix patch, one preparation patch, and one conversion patch.

  TOMOYO is useful as an analysis tool for learning how a Linux system
  works. My boss was hoping that SELinux's policy is generated from what
  TOMOYO has observed. A translated paper describing it is available at

    https://master.dl.sourceforge.net/project/tomoyo/docs/nsf2003-en.pdf/nsf2003-en.pdf?viasf=1

  Although that attempt failed due to mapping problem between inode and
  pathname, TOMOYO remains as an access restriction tool due to ability
  to write custom policy by individuals.

  I was delivering pure LKM version of TOMOYO (named AKARI) to users who
  cannot afford rebuilding their distro kernels with TOMOYO enabled. But
  since the LSM framework was converted to static calls, it became more
  difficult to deliver AKARI to such users. Therefore, I decided to
  update TOMOYO so that people can use mostly LKM version of TOMOYO with
  minimal burden for both distributors and users"

* tag 'tomoyo-pr-20240927' of git://git.code.sf.net/p/tomoyo/tomoyo:
  tomoyo: fallback to realpath if symlink's pathname does not exist
  tomoyo: allow building as a loadable LSM module
  tomoyo: preparation step for building as a loadable LSM module
This commit is contained in:
Linus Torvalds 2024-09-27 12:03:48 -07:00
commit ba33a49fcd
12 changed files with 583 additions and 121 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
security/tomoyo/Kconfig
View File

@ -13,6 +13,21 @@ config SECURITY_TOMOYO
found at <https://tomoyo.sourceforge.net/>.
If you are unsure how to answer this question, answer N.
config SECURITY_TOMOYO_LKM
bool "Cut out most of TOMOYO's code to a loadable kernel module"
default n
depends on SECURITY_TOMOYO
depends on MODULES
help
Say Y here if you want to include TOMOYO without bloating
vmlinux file. If you say Y, most of TOMOYO code is cut out to
a loadable kernel module named tomoyo.ko . This option will be
useful for kernels built by Linux distributors where TOMOYO is
included but TOMOYO is not enabled by default. Please be sure
to explicitly load tomoyo.ko if you want to activate TOMOYO
without calling userspace policy loader, for tomoyo.ko is
loaded immediately before calling userspace policy loader.
config SECURITY_TOMOYO_MAX_ACCEPT_ENTRY
int "Default maximal count for learning mode"
default 2048

8
security/tomoyo/Makefile
View File

@ -1,5 +1,11 @@
# 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
tomoyo-objs := audit.o common.o condition.o domain.o environ.o file.o gc.o group.o memory.o mount.o network.o proxy.o realpath.o securityfs_if.o util.o
obj-y += init.o load_policy.o
ifdef CONFIG_SECURITY_TOMOYO_LKM
obj-m += tomoyo.o
else
obj-y += tomoyo.o
endif
targets += builtin-policy.h

14
security/tomoyo/common.c
View File

@ -998,8 +998,13 @@ static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
p = find_task_by_pid_ns(pid, &init_pid_ns);
else
p = find_task_by_vpid(pid);
if (p)
if (p) {
domain = tomoyo_task(p)->domain_info;
#ifdef CONFIG_SECURITY_TOMOYO_LKM
if (!domain)
domain = &tomoyo_kernel_domain;
#endif
}
rcu_read_unlock();
} else if (!strncmp(data, "domain=", 7)) {
if (tomoyo_domain_def(data + 7))
@ -1710,8 +1715,13 @@ static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
p = find_task_by_pid_ns(pid, &init_pid_ns);
else
p = find_task_by_vpid(pid);
if (p)
if (p) {
domain = tomoyo_task(p)->domain_info;
#ifdef CONFIG_SECURITY_TOMOYO_LKM
if (!domain)
domain = &tomoyo_kernel_domain;
#endif
}
rcu_read_unlock();
if (!domain)
return;

72
security/tomoyo/common.h
View File

@ -978,6 +978,7 @@ int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
int tomoyo_init_request_info(struct tomoyo_request_info *r,
struct tomoyo_domain_info *domain,
const u8 index);
int __init tomoyo_interface_init(void);
int tomoyo_mkdev_perm(const u8 operation, const struct path *path,
const unsigned int mode, unsigned int dev);
int tomoyo_mount_permission(const char *dev_name, const struct path *path,
@ -1214,10 +1215,14 @@ static inline void tomoyo_put_group(struct tomoyo_group *group)
*
* Returns pointer to "struct tomoyo_task" for specified thread.
*/
#ifdef CONFIG_SECURITY_TOMOYO_LKM
extern struct tomoyo_task *tomoyo_task(struct task_struct *task);
#else
static inline struct tomoyo_task *tomoyo_task(struct task_struct *task)
{
return task->security + tomoyo_blob_sizes.lbs_task;
}
#endif
/**
* tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
@ -1284,4 +1289,71 @@ static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
pos = srcu_dereference((head)->next, &tomoyo_ss); \
for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))
#ifdef CONFIG_SECURITY_TOMOYO_LKM
#define LSM_HOOK(RET, DEFAULT, NAME, ...) typedef RET (NAME##_t)(__VA_ARGS__);
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
struct tomoyo_hooks {
cred_prepare_t *cred_prepare;
bprm_committed_creds_t *bprm_committed_creds;
task_alloc_t *task_alloc;
task_free_t *task_free;
bprm_check_security_t *bprm_check_security;
file_fcntl_t *file_fcntl;
file_open_t *file_open;
file_truncate_t *file_truncate;
path_truncate_t *path_truncate;
path_unlink_t *path_unlink;
path_mkdir_t *path_mkdir;
path_rmdir_t *path_rmdir;
path_symlink_t *path_symlink;
path_mknod_t *path_mknod;
path_link_t *path_link;
path_rename_t *path_rename;
inode_getattr_t *inode_getattr;
file_ioctl_t *file_ioctl;
file_ioctl_compat_t *file_ioctl_compat;
path_chmod_t *path_chmod;
path_chown_t *path_chown;
path_chroot_t *path_chroot;
sb_mount_t *sb_mount;
sb_umount_t *sb_umount;
sb_pivotroot_t *sb_pivotroot;
socket_bind_t *socket_bind;
socket_connect_t *socket_connect;
socket_listen_t *socket_listen;
socket_sendmsg_t *socket_sendmsg;
};
extern void tomoyo_register_hooks(const struct tomoyo_hooks *tomoyo_hooks);
struct tomoyo_operations {
void (*check_profile)(void);
int enabled;
};
extern struct tomoyo_operations tomoyo_ops;
/*
* Temporary hack: functions needed by tomoyo.ko . This will be removed
* after all functions are marked as EXPORT_STMBOL_GPL().
*/
struct tomoyo_tmp_exports {
struct task_struct * (*find_task_by_vpid)(pid_t nr);
struct task_struct * (*find_task_by_pid_ns)(pid_t nr, struct pid_namespace *ns);
void (*put_filesystem)(struct file_system_type *fs);
struct file * (*get_mm_exe_file)(struct mm_struct *mm);
char * (*d_absolute_path)(const struct path *path, char *buf, int buflen);
};
extern const struct tomoyo_tmp_exports tomoyo_tmp_exports;
#define find_task_by_vpid tomoyo_tmp_exports.find_task_by_vpid
#define find_task_by_pid_ns tomoyo_tmp_exports.find_task_by_pid_ns
#define put_filesystem tomoyo_tmp_exports.put_filesystem
#define get_mm_exe_file tomoyo_tmp_exports.get_mm_exe_file
#define d_absolute_path tomoyo_tmp_exports.d_absolute_path
#endif /* defined(CONFIG_SECURITY_TOMOYO_LKM) */
#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */

9
security/tomoyo/domain.c
View File

@ -723,10 +723,13 @@ int tomoyo_find_next_domain(struct linux_binprm *bprm)
ee->r.obj = &ee->obj;
ee->obj.path1 = bprm->file->f_path;
/* Get symlink's pathname of program. */
retval = -ENOENT;
exename.name = tomoyo_realpath_nofollow(original_name);
if (!exename.name)
goto out;
if (!exename.name) {
/* Fallback to realpath if symlink's pathname does not exist. */
exename.name = tomoyo_realpath_from_path(&bprm->file->f_path);
if (!exename.name)
goto out;
}
tomoyo_fill_path_info(&exename);
retry:
/* Check 'aggregator' directive. */

3
security/tomoyo/gc.c
View File

@ -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,
};

366
security/tomoyo/init.c Normal file
View File

@ -0,0 +1,366 @@
// 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"
#ifndef CONFIG_SECURITY_TOMOYO_LKM
#include "hooks.h"
#else
#define DEFINE_STATIC_CALL_PROXY(NAME) \
static NAME##_t tomoyo_##NAME; \
DEFINE_STATIC_CALL_RET0(tomoyo_##NAME, tomoyo_##NAME);
DEFINE_STATIC_CALL_PROXY(cred_prepare)
DEFINE_STATIC_CALL_PROXY(bprm_committed_creds)
DEFINE_STATIC_CALL_PROXY(bprm_check_security)
DEFINE_STATIC_CALL_PROXY(inode_getattr)
DEFINE_STATIC_CALL_PROXY(path_truncate)
DEFINE_STATIC_CALL_PROXY(file_truncate)
DEFINE_STATIC_CALL_PROXY(path_unlink)
DEFINE_STATIC_CALL_PROXY(path_mkdir)
DEFINE_STATIC_CALL_PROXY(path_rmdir)
DEFINE_STATIC_CALL_PROXY(path_symlink)
DEFINE_STATIC_CALL_PROXY(path_mknod)
DEFINE_STATIC_CALL_PROXY(path_link)
DEFINE_STATIC_CALL_PROXY(path_rename)
DEFINE_STATIC_CALL_PROXY(file_fcntl)
DEFINE_STATIC_CALL_PROXY(file_open)
DEFINE_STATIC_CALL_PROXY(file_ioctl)
DEFINE_STATIC_CALL_PROXY(path_chmod)
DEFINE_STATIC_CALL_PROXY(path_chown)
DEFINE_STATIC_CALL_PROXY(path_chroot)
DEFINE_STATIC_CALL_PROXY(sb_mount)
DEFINE_STATIC_CALL_PROXY(sb_umount)
DEFINE_STATIC_CALL_PROXY(sb_pivotroot)
DEFINE_STATIC_CALL_PROXY(socket_listen)
DEFINE_STATIC_CALL_PROXY(socket_connect)
DEFINE_STATIC_CALL_PROXY(socket_bind)
DEFINE_STATIC_CALL_PROXY(socket_sendmsg)
DEFINE_STATIC_CALL_PROXY(task_alloc)
DEFINE_STATIC_CALL_PROXY(task_free)
#undef DEFINE_STATIC_CALL_PROXY
static int tomoyo_cred_prepare(struct cred *new, const struct cred *old, gfp_t gfp)
{
return static_call(tomoyo_cred_prepare)(new, old, gfp);
}
static void tomoyo_bprm_committed_creds(const struct linux_binprm *bprm)
{
static_call(tomoyo_bprm_committed_creds)(bprm);
}
static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
{
return static_call(tomoyo_bprm_check_security)(bprm);
}
static int tomoyo_inode_getattr(const struct path *path)
{
return static_call(tomoyo_inode_getattr)(path);
}
static int tomoyo_path_truncate(const struct path *path)
{
return static_call(tomoyo_path_truncate)(path);
}
static int tomoyo_file_truncate(struct file *file)
{
return static_call(tomoyo_file_truncate)(file);
}
static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry)
{
return static_call(tomoyo_path_unlink)(parent, dentry);
}
static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry, umode_t mode)
{
return static_call(tomoyo_path_mkdir)(parent, dentry, mode);
}
static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry)
{
return static_call(tomoyo_path_rmdir)(parent, dentry);
}
static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry,
const char *old_name)
{
return static_call(tomoyo_path_symlink)(parent, dentry, old_name);
}
static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry,
umode_t mode, unsigned int dev)
{
return static_call(tomoyo_path_mknod)(parent, dentry, mode, dev);
}
static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir,
struct dentry *new_dentry)
{
return static_call(tomoyo_path_link)(old_dentry, new_dir, new_dentry);
}
static int tomoyo_path_rename(const struct path *old_parent, struct dentry *old_dentry,
const struct path *new_parent, struct dentry *new_dentry,
const unsigned int flags)
{
return static_call(tomoyo_path_rename)(old_parent, old_dentry, new_parent, new_dentry, flags);
}
static int tomoyo_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
return static_call(tomoyo_file_fcntl)(file, cmd, arg);
}
static int tomoyo_file_open(struct file *f)
{
return static_call(tomoyo_file_open)(f);
}
static int tomoyo_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return static_call(tomoyo_file_ioctl)(file, cmd, arg);
}
static int tomoyo_path_chmod(const struct path *path, umode_t mode)
{
return static_call(tomoyo_path_chmod)(path, mode);
}
static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
return static_call(tomoyo_path_chown)(path, uid, gid);
}
static int tomoyo_path_chroot(const struct path *path)
{
return static_call(tomoyo_path_chroot)(path);
}
static int tomoyo_sb_mount(const char *dev_name, const struct path *path,
const char *type, unsigned long flags, void *data)
{
return static_call(tomoyo_sb_mount)(dev_name, path, type, flags, data);
}
static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
{
return static_call(tomoyo_sb_umount)(mnt, flags);
}
static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path)
{
return static_call(tomoyo_sb_pivotroot)(old_path, new_path);
}
static int tomoyo_socket_listen(struct socket *sock, int backlog)
{
return static_call(tomoyo_socket_listen)(sock, backlog);
}
static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr, int addr_len)
{
return static_call(tomoyo_socket_connect)(sock, addr, addr_len);
}
static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
return static_call(tomoyo_socket_bind)(sock, addr, addr_len);
}
static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
{
return static_call(tomoyo_socket_sendmsg)(sock, msg, size);
}
static int tomoyo_task_alloc(struct task_struct *task, unsigned long clone_flags)
{
return static_call(tomoyo_task_alloc)(task, clone_flags);
}
static void tomoyo_task_free(struct task_struct *task)
{
static_call(tomoyo_task_free)(task);
}
void tomoyo_register_hooks(const struct tomoyo_hooks *tomoyo_hooks)
{
static void *registered;
if (cmpxchg(&registered, NULL, &registered))
panic("%s was called twice!\n", __func__);
static_call_update(tomoyo_task_free, tomoyo_hooks->task_free);
static_call_update(tomoyo_task_alloc, tomoyo_hooks->task_alloc);
static_call_update(tomoyo_cred_prepare, tomoyo_hooks->cred_prepare);
static_call_update(tomoyo_bprm_committed_creds, tomoyo_hooks->bprm_committed_creds);
static_call_update(tomoyo_bprm_check_security, tomoyo_hooks->bprm_check_security);
static_call_update(tomoyo_inode_getattr, tomoyo_hooks->inode_getattr);
static_call_update(tomoyo_path_truncate, tomoyo_hooks->path_truncate);
static_call_update(tomoyo_file_truncate, tomoyo_hooks->file_truncate);
static_call_update(tomoyo_path_unlink, tomoyo_hooks->path_unlink);
static_call_update(tomoyo_path_mkdir, tomoyo_hooks->path_mkdir);
static_call_update(tomoyo_path_rmdir, tomoyo_hooks->path_rmdir);
static_call_update(tomoyo_path_symlink, tomoyo_hooks->path_symlink);
static_call_update(tomoyo_path_mknod, tomoyo_hooks->path_mknod);
static_call_update(tomoyo_path_link, tomoyo_hooks->path_link);
static_call_update(tomoyo_path_rename, tomoyo_hooks->path_rename);
static_call_update(tomoyo_file_fcntl, tomoyo_hooks->file_fcntl);
static_call_update(tomoyo_file_open, tomoyo_hooks->file_open);
static_call_update(tomoyo_file_ioctl, tomoyo_hooks->file_ioctl);
static_call_update(tomoyo_path_chmod, tomoyo_hooks->path_chmod);
static_call_update(tomoyo_path_chown, tomoyo_hooks->path_chown);
static_call_update(tomoyo_path_chroot, tomoyo_hooks->path_chroot);
static_call_update(tomoyo_sb_mount, tomoyo_hooks->sb_mount);
static_call_update(tomoyo_sb_umount, tomoyo_hooks->sb_umount);
static_call_update(tomoyo_sb_pivotroot, tomoyo_hooks->sb_pivotroot);
static_call_update(tomoyo_socket_listen, tomoyo_hooks->socket_listen);
static_call_update(tomoyo_socket_connect, tomoyo_hooks->socket_connect);
static_call_update(tomoyo_socket_bind, tomoyo_hooks->socket_bind);
static_call_update(tomoyo_socket_sendmsg, tomoyo_hooks->socket_sendmsg);
}
EXPORT_SYMBOL_GPL(tomoyo_register_hooks);
/*
* Temporary hack: functions needed by tomoyo.ko . This hack will be removed
* after all functions are marked as EXPORT_STMBOL_GPL().
*/
#undef find_task_by_vpid
#undef find_task_by_pid_ns
#undef put_filesystem
#undef get_mm_exe_file
#undef d_absolute_path
const struct tomoyo_tmp_exports tomoyo_tmp_exports = {
.find_task_by_vpid = find_task_by_vpid,
.find_task_by_pid_ns = find_task_by_pid_ns,
.put_filesystem = put_filesystem,
.get_mm_exe_file = get_mm_exe_file,
.d_absolute_path = d_absolute_path,
};
EXPORT_SYMBOL_GPL(tomoyo_tmp_exports);
#endif
#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;
#ifdef CONFIG_SECURITY_TOMOYO_LKM
EXPORT_SYMBOL_GPL(tomoyo_blob_sizes);
EXPORT_SYMBOL_GPL(tomoyo_policy_loaded);
struct tomoyo_operations tomoyo_ops;
EXPORT_SYMBOL_GPL(tomoyo_ops);
/**
* tomoyo_init - Reserve hooks for TOMOYO Linux.
*
* Returns 0.
*/
static int __init tomoyo_init(void)
{
/* register ourselves with the security framework */
security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), &tomoyo_lsmid);
tomoyo_ops.enabled = tomoyo_enabled;
pr_info("Hooks for initializing TOMOYO Linux are ready\n");
return 0;
}
#else
/**
* 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;
}
#endif
DEFINE_LSM(tomoyo) = {
.name = "tomoyo",
.enabled = &tomoyo_enabled,
.flags = LSM_FLAG_LEGACY_MAJOR,
.blobs = &tomoyo_blob_sizes,
.init = tomoyo_init,
};

12
security/tomoyo/load_policy.c
View File

@ -97,6 +97,14 @@ void tomoyo_load_policy(const char *filename)
if (!tomoyo_policy_loader_exists())
return;
done = true;
#ifdef CONFIG_SECURITY_TOMOYO_LKM
/* Load tomoyo.ko if not yet loaded. */
if (!tomoyo_ops.check_profile)
request_module("tomoyo");
/* Check if tomoyo.ko was successfully loaded. */
if (!tomoyo_ops.check_profile)
panic("Failed to load tomoyo module.");
#endif
pr_info("Calling %s to load policy. Please wait.\n", tomoyo_loader);
argv[0] = (char *) tomoyo_loader;
argv[1] = NULL;
@ -104,7 +112,11 @@ void tomoyo_load_policy(const char *filename)
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
envp[2] = NULL;
call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
#ifdef CONFIG_SECURITY_TOMOYO_LKM
tomoyo_ops.check_profile();
#else
tomoyo_check_profile();
#endif
}
#endif

82
security/tomoyo/proxy.c Normal file
View File

@ -0,0 +1,82 @@
// SPDX-License-Identifier: GPL-2.0
/*
* security/tomoyo/proxy.c
*
* Copyright (C) 2005-2011 NTT DATA CORPORATION
*/
#include <linux/security.h>
#include "common.h"
#ifdef CONFIG_SECURITY_TOMOYO_LKM
struct tomoyo_task *tomoyo_task(struct task_struct *task)
{
struct tomoyo_task *s = task->security + tomoyo_blob_sizes.lbs_task;
if (unlikely(!s->domain_info)) {
if (likely(task == current)) {
s->domain_info = &tomoyo_kernel_domain;
atomic_inc(&tomoyo_kernel_domain.users);
} else {
/* Caller handles s->domain_info == NULL case. */
}
}
return s;
}
#include "hooks.h"
/**
* tomoyo_runtime_init - Register TOMOYO Linux as a loadable LSM module.
*
* Returns 0 if TOMOYO is enabled, -EINVAL otherwise.
*/
static int __init tomoyo_runtime_init(void)
{
const struct tomoyo_hooks tomoyo_hooks = {
.cred_prepare = tomoyo_cred_prepare,
.bprm_committed_creds = tomoyo_bprm_committed_creds,
.task_alloc = tomoyo_task_alloc,
.task_free = tomoyo_task_free,
.bprm_check_security = tomoyo_bprm_check_security,
.file_fcntl = tomoyo_file_fcntl,
.file_open = tomoyo_file_open,
.file_truncate = tomoyo_file_truncate,
.path_truncate = tomoyo_path_truncate,
.path_unlink = tomoyo_path_unlink,
.path_mkdir = tomoyo_path_mkdir,
.path_rmdir = tomoyo_path_rmdir,
.path_symlink = tomoyo_path_symlink,
.path_mknod = tomoyo_path_mknod,
.path_link = tomoyo_path_link,
.path_rename = tomoyo_path_rename,
.inode_getattr = tomoyo_inode_getattr,
.file_ioctl = tomoyo_file_ioctl,
.file_ioctl_compat = tomoyo_file_ioctl,
.path_chmod = tomoyo_path_chmod,
.path_chown = tomoyo_path_chown,
.path_chroot = tomoyo_path_chroot,
.sb_mount = tomoyo_sb_mount,
.sb_umount = tomoyo_sb_umount,
.sb_pivotroot = tomoyo_sb_pivotroot,
.socket_bind = tomoyo_socket_bind,
.socket_connect = tomoyo_socket_connect,
.socket_listen = tomoyo_socket_listen,
.socket_sendmsg = tomoyo_socket_sendmsg,
};
if (!tomoyo_ops.enabled)
return -EINVAL;
tomoyo_ops.check_profile = tomoyo_check_profile;
pr_info("TOMOYO Linux initialized\n");
tomoyo_task(current);
tomoyo_mm_init();
tomoyo_interface_init();
tomoyo_register_hooks(&tomoyo_hooks);
return 0;
}
module_init(tomoyo_runtime_init);
MODULE_LICENSE("GPL");
#endif

10
security/tomoyo/securityfs_if.c
View File

@ -229,17 +229,19 @@ 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)
int __init tomoyo_interface_init(void)
{
struct tomoyo_domain_info *domain;
struct dentry *tomoyo_dir;
#ifndef CONFIG_SECURITY_TOMOYO_LKM
if (!tomoyo_enabled)
return 0;
#endif
domain = tomoyo_domain();
/* Don't create securityfs entries unless registered. */
if (domain != &tomoyo_kernel_domain)
@ -270,4 +272,6 @@ static int __init tomoyo_initerface_init(void)
return 0;
}
fs_initcall(tomoyo_initerface_init);
#ifndef CONFIG_SECURITY_TOMOYO_LKM
fs_initcall(tomoyo_interface_init);
#endif

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".