v4.19.13 snapshot.
diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c
new file mode 100644
index 0000000..9f932e2
--- /dev/null
+++ b/security/tomoyo/tomoyo.c
@@ -0,0 +1,553 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * security/tomoyo/tomoyo.c
+ *
+ * Copyright (C) 2005-2011 NTT DATA CORPORATION
+ */
+
+#include <linux/lsm_hooks.h>
+#include "common.h"
+
+/**
+ * tomoyo_cred_alloc_blank - Target for security_cred_alloc_blank().
+ *
+ * @new: Pointer to "struct cred".
+ * @gfp: Memory allocation flags.
+ *
+ * Returns 0.
+ */
+static int tomoyo_cred_alloc_blank(struct cred *new, gfp_t gfp)
+{
+ new->security = NULL;
+ return 0;
+}
+
+/**
+ * tomoyo_cred_prepare - Target for security_prepare_creds().
+ *
+ * @new: Pointer to "struct cred".
+ * @old: Pointer to "struct cred".
+ * @gfp: Memory allocation flags.
+ *
+ * Returns 0.
+ */
+static int tomoyo_cred_prepare(struct cred *new, const struct cred *old,
+ gfp_t gfp)
+{
+ struct tomoyo_domain_info *domain = old->security;
+ new->security = domain;
+ if (domain)
+ atomic_inc(&domain->users);
+ return 0;
+}
+
+/**
+ * tomoyo_cred_transfer - Target for security_transfer_creds().
+ *
+ * @new: Pointer to "struct cred".
+ * @old: Pointer to "struct cred".
+ */
+static void tomoyo_cred_transfer(struct cred *new, const struct cred *old)
+{
+ tomoyo_cred_prepare(new, old, 0);
+}
+
+/**
+ * tomoyo_cred_free - Target for security_cred_free().
+ *
+ * @cred: Pointer to "struct cred".
+ */
+static void tomoyo_cred_free(struct cred *cred)
+{
+ struct tomoyo_domain_info *domain = cred->security;
+ if (domain)
+ atomic_dec(&domain->users);
+}
+
+/**
+ * tomoyo_bprm_set_creds - Target for security_bprm_set_creds().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_bprm_set_creds(struct linux_binprm *bprm)
+{
+ /*
+ * Do only if this function is called for the first time of an execve
+ * operation.
+ */
+ if (bprm->called_set_creds)
+ return 0;
+#ifndef CONFIG_SECURITY_TOMOYO_OMIT_USERSPACE_LOADER
+ /*
+ * 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);
+#endif
+ /*
+ * Release reference to "struct tomoyo_domain_info" stored inside
+ * "bprm->cred->security". New reference to "struct tomoyo_domain_info"
+ * stored inside "bprm->cred->security" will be acquired later inside
+ * tomoyo_find_next_domain().
+ */
+ atomic_dec(&((struct tomoyo_domain_info *)
+ bprm->cred->security)->users);
+ /*
+ * Tell tomoyo_bprm_check_security() is called for the first time of an
+ * execve operation.
+ */
+ bprm->cred->security = NULL;
+ return 0;
+}
+
+/**
+ * tomoyo_bprm_check_security - Target for security_bprm_check().
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_bprm_check_security(struct linux_binprm *bprm)
+{
+ struct tomoyo_domain_info *domain = bprm->cred->security;
+
+ /*
+ * Execute permission is checked against pathname passed to do_execve()
+ * using current domain.
+ */
+ if (!domain) {
+ const int idx = tomoyo_read_lock();
+ const int err = tomoyo_find_next_domain(bprm);
+ tomoyo_read_unlock(idx);
+ return err;
+ }
+ /*
+ * Read permission is checked against interpreters using next domain.
+ */
+ return tomoyo_check_open_permission(domain, &bprm->file->f_path,
+ O_RDONLY);
+}
+
+/**
+ * tomoyo_inode_getattr - Target for security_inode_getattr().
+ *
+ * @mnt: Pointer to "struct vfsmount".
+ * @dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_inode_getattr(const struct path *path)
+{
+ return tomoyo_path_perm(TOMOYO_TYPE_GETATTR, path, NULL);
+}
+
+/**
+ * tomoyo_path_truncate - Target for security_path_truncate().
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_truncate(const struct path *path)
+{
+ return tomoyo_path_perm(TOMOYO_TYPE_TRUNCATE, path, NULL);
+}
+
+/**
+ * tomoyo_path_unlink - Target for security_path_unlink().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_unlink(const struct path *parent, struct dentry *dentry)
+{
+ struct path path = { .mnt = parent->mnt, .dentry = dentry };
+ return tomoyo_path_perm(TOMOYO_TYPE_UNLINK, &path, NULL);
+}
+
+/**
+ * tomoyo_path_mkdir - Target for security_path_mkdir().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ * @mode: DAC permission mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_mkdir(const struct path *parent, struct dentry *dentry,
+ umode_t mode)
+{
+ struct path path = { .mnt = parent->mnt, .dentry = dentry };
+ return tomoyo_path_number_perm(TOMOYO_TYPE_MKDIR, &path,
+ mode & S_IALLUGO);
+}
+
+/**
+ * tomoyo_path_rmdir - Target for security_path_rmdir().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_rmdir(const struct path *parent, struct dentry *dentry)
+{
+ struct path path = { .mnt = parent->mnt, .dentry = dentry };
+ return tomoyo_path_perm(TOMOYO_TYPE_RMDIR, &path, NULL);
+}
+
+/**
+ * tomoyo_path_symlink - Target for security_path_symlink().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ * @old_name: Symlink's content.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_symlink(const struct path *parent, struct dentry *dentry,
+ const char *old_name)
+{
+ struct path path = { .mnt = parent->mnt, .dentry = dentry };
+ return tomoyo_path_perm(TOMOYO_TYPE_SYMLINK, &path, old_name);
+}
+
+/**
+ * tomoyo_path_mknod - Target for security_path_mknod().
+ *
+ * @parent: Pointer to "struct path".
+ * @dentry: Pointer to "struct dentry".
+ * @mode: DAC permission mode.
+ * @dev: Device attributes.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_mknod(const struct path *parent, struct dentry *dentry,
+ umode_t mode, unsigned int dev)
+{
+ struct path path = { .mnt = parent->mnt, .dentry = dentry };
+ int type = TOMOYO_TYPE_CREATE;
+ const unsigned int perm = mode & S_IALLUGO;
+
+ switch (mode & S_IFMT) {
+ case S_IFCHR:
+ type = TOMOYO_TYPE_MKCHAR;
+ break;
+ case S_IFBLK:
+ type = TOMOYO_TYPE_MKBLOCK;
+ break;
+ default:
+ goto no_dev;
+ }
+ return tomoyo_mkdev_perm(type, &path, perm, dev);
+ no_dev:
+ switch (mode & S_IFMT) {
+ case S_IFIFO:
+ type = TOMOYO_TYPE_MKFIFO;
+ break;
+ case S_IFSOCK:
+ type = TOMOYO_TYPE_MKSOCK;
+ break;
+ }
+ return tomoyo_path_number_perm(type, &path, perm);
+}
+
+/**
+ * tomoyo_path_link - Target for security_path_link().
+ *
+ * @old_dentry: Pointer to "struct dentry".
+ * @new_dir: Pointer to "struct path".
+ * @new_dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_link(struct dentry *old_dentry, const struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { .mnt = new_dir->mnt, .dentry = old_dentry };
+ struct path path2 = { .mnt = new_dir->mnt, .dentry = new_dentry };
+ return tomoyo_path2_perm(TOMOYO_TYPE_LINK, &path1, &path2);
+}
+
+/**
+ * tomoyo_path_rename - Target for security_path_rename().
+ *
+ * @old_parent: Pointer to "struct path".
+ * @old_dentry: Pointer to "struct dentry".
+ * @new_parent: Pointer to "struct path".
+ * @new_dentry: Pointer to "struct dentry".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_rename(const struct path *old_parent,
+ struct dentry *old_dentry,
+ const struct path *new_parent,
+ struct dentry *new_dentry)
+{
+ struct path path1 = { .mnt = old_parent->mnt, .dentry = old_dentry };
+ struct path path2 = { .mnt = new_parent->mnt, .dentry = new_dentry };
+ return tomoyo_path2_perm(TOMOYO_TYPE_RENAME, &path1, &path2);
+}
+
+/**
+ * tomoyo_file_fcntl - Target for security_file_fcntl().
+ *
+ * @file: Pointer to "struct file".
+ * @cmd: Command for fcntl().
+ * @arg: Argument for @cmd.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_fcntl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ if (!(cmd == F_SETFL && ((arg ^ file->f_flags) & O_APPEND)))
+ return 0;
+ return tomoyo_check_open_permission(tomoyo_domain(), &file->f_path,
+ O_WRONLY | (arg & O_APPEND));
+}
+
+/**
+ * tomoyo_file_open - Target for security_file_open().
+ *
+ * @f: Pointer to "struct file".
+ * @cred: Pointer to "struct cred".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_open(struct file *f)
+{
+ int flags = f->f_flags;
+ /* Don't check read permission here if called from do_execve(). */
+ if (current->in_execve)
+ return 0;
+ return tomoyo_check_open_permission(tomoyo_domain(), &f->f_path, flags);
+}
+
+/**
+ * tomoyo_file_ioctl - Target for security_file_ioctl().
+ *
+ * @file: Pointer to "struct file".
+ * @cmd: Command for ioctl().
+ * @arg: Argument for @cmd.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_file_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return tomoyo_path_number_perm(TOMOYO_TYPE_IOCTL, &file->f_path, cmd);
+}
+
+/**
+ * tomoyo_path_chmod - Target for security_path_chmod().
+ *
+ * @path: Pointer to "struct path".
+ * @mode: DAC permission mode.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chmod(const struct path *path, umode_t mode)
+{
+ return tomoyo_path_number_perm(TOMOYO_TYPE_CHMOD, path,
+ mode & S_IALLUGO);
+}
+
+/**
+ * tomoyo_path_chown - Target for security_path_chown().
+ *
+ * @path: Pointer to "struct path".
+ * @uid: Owner ID.
+ * @gid: Group ID.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
+{
+ int error = 0;
+ if (uid_valid(uid))
+ error = tomoyo_path_number_perm(TOMOYO_TYPE_CHOWN, path,
+ from_kuid(&init_user_ns, uid));
+ if (!error && gid_valid(gid))
+ error = tomoyo_path_number_perm(TOMOYO_TYPE_CHGRP, path,
+ from_kgid(&init_user_ns, gid));
+ return error;
+}
+
+/**
+ * tomoyo_path_chroot - Target for security_path_chroot().
+ *
+ * @path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_path_chroot(const struct path *path)
+{
+ return tomoyo_path_perm(TOMOYO_TYPE_CHROOT, path, NULL);
+}
+
+/**
+ * tomoyo_sb_mount - Target for security_sb_mount().
+ *
+ * @dev_name: Name of device file. Maybe NULL.
+ * @path: Pointer to "struct path".
+ * @type: Name of filesystem type. Maybe NULL.
+ * @flags: Mount options.
+ * @data: Optional data. Maybe NULL.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_mount(const char *dev_name, const struct path *path,
+ const char *type, unsigned long flags, void *data)
+{
+ return tomoyo_mount_permission(dev_name, path, type, flags, data);
+}
+
+/**
+ * tomoyo_sb_umount - Target for security_sb_umount().
+ *
+ * @mnt: Pointer to "struct vfsmount".
+ * @flags: Unmount options.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_umount(struct vfsmount *mnt, int flags)
+{
+ struct path path = { .mnt = mnt, .dentry = mnt->mnt_root };
+ return tomoyo_path_perm(TOMOYO_TYPE_UMOUNT, &path, NULL);
+}
+
+/**
+ * tomoyo_sb_pivotroot - Target for security_sb_pivotroot().
+ *
+ * @old_path: Pointer to "struct path".
+ * @new_path: Pointer to "struct path".
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_sb_pivotroot(const struct path *old_path, const struct path *new_path)
+{
+ return tomoyo_path2_perm(TOMOYO_TYPE_PIVOT_ROOT, new_path, old_path);
+}
+
+/**
+ * tomoyo_socket_listen - Check permission for listen().
+ *
+ * @sock: Pointer to "struct socket".
+ * @backlog: Backlog parameter.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_listen(struct socket *sock, int backlog)
+{
+ return tomoyo_socket_listen_permission(sock);
+}
+
+/**
+ * tomoyo_socket_connect - Check permission for connect().
+ *
+ * @sock: Pointer to "struct socket".
+ * @addr: Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_connect(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ return tomoyo_socket_connect_permission(sock, addr, addr_len);
+}
+
+/**
+ * tomoyo_socket_bind - Check permission for bind().
+ *
+ * @sock: Pointer to "struct socket".
+ * @addr: Pointer to "struct sockaddr".
+ * @addr_len: Size of @addr.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_bind(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ return tomoyo_socket_bind_permission(sock, addr, addr_len);
+}
+
+/**
+ * tomoyo_socket_sendmsg - Check permission for sendmsg().
+ *
+ * @sock: Pointer to "struct socket".
+ * @msg: Pointer to "struct msghdr".
+ * @size: Size of message.
+ *
+ * Returns 0 on success, negative value otherwise.
+ */
+static int tomoyo_socket_sendmsg(struct socket *sock, struct msghdr *msg,
+ int size)
+{
+ return tomoyo_socket_sendmsg_permission(sock, msg, size);
+}
+
+/*
+ * tomoyo_security_ops is a "struct security_operations" which is used for
+ * registering TOMOYO.
+ */
+static struct security_hook_list tomoyo_hooks[] __lsm_ro_after_init = {
+ LSM_HOOK_INIT(cred_alloc_blank, tomoyo_cred_alloc_blank),
+ LSM_HOOK_INIT(cred_prepare, tomoyo_cred_prepare),
+ LSM_HOOK_INIT(cred_transfer, tomoyo_cred_transfer),
+ LSM_HOOK_INIT(cred_free, tomoyo_cred_free),
+ LSM_HOOK_INIT(bprm_set_creds, tomoyo_bprm_set_creds),
+ 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(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(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);
+
+/**
+ * tomoyo_init - Register TOMOYO Linux as a LSM module.
+ *
+ * Returns 0.
+ */
+static int __init tomoyo_init(void)
+{
+ struct cred *cred = (struct cred *) current_cred();
+
+ if (!security_module_enable("tomoyo"))
+ return 0;
+ /* register ourselves with the security framework */
+ security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo");
+ printk(KERN_INFO "TOMOYO Linux initialized\n");
+ cred->security = &tomoyo_kernel_domain;
+ tomoyo_mm_init();
+ return 0;
+}
+
+security_initcall(tomoyo_init);