RE: [RFC 1/3] WhiteEgret: Add WhiteEgret core functions.

From: masanobu2.koike
Date: Mon Jun 05 2017 - 04:40:18 EST

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In reply to: masanobu2.koike: "RE: [RFC 1/3] WhiteEgret: Add WhiteEgret core functions."
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Casey Schaufler wrote:
> On 5/30/2017 4:13 AM, Masanobu Koike wrote:
> > This RFC provides implementation of WhiteEgret.
> >
> > Signed-off-by: Masanobu Koike <masanobu2.koike@xxxxxxxxxxxxx>
> > ---
> > security/Kconfig | 7 +-
> > security/Makefile | 2 +
> > security/whiteegret/Kconfig | 21 ++
> > security/whiteegret/Makefile | 7 +
> > security/whiteegret/auth.c | 19 ++
> > security/whiteegret/auth.h | 12 ++
> > security/whiteegret/dd_com.c | 79 ++++++++
> > security/whiteegret/dd_com.h | 19 ++
> > security/whiteegret/gennl.c | 382
> +++++++++++++++++++++++++++++++++++++
> > security/whiteegret/gennl.h | 32 ++++
> > security/whiteegret/gennl_common.h | 43 +++++
> > security/whiteegret/init.c | 69 +++++++
> > security/whiteegret/main.c | 340
> +++++++++++++++++++++++++++++++++
> > security/whiteegret/print_msg.h | 19 ++
> > security/whiteegret/request.c | 248 ++++++++++++++++++++++++
> > security/whiteegret/request.h | 79 ++++++++
> > security/whiteegret/returntoexec.h | 14 ++
> > security/whiteegret/we.h | 72 +++++++
> > security/whiteegret/we_common.h | 19 ++
> > 19 files changed, 1482 insertions(+), 1 deletion(-)
> > create mode 100644 security/whiteegret/Kconfig
> > create mode 100644 security/whiteegret/Makefile
> > create mode 100644 security/whiteegret/auth.c
> > create mode 100644 security/whiteegret/auth.h
> > create mode 100644 security/whiteegret/dd_com.c
> > create mode 100644 security/whiteegret/dd_com.h
> > create mode 100644 security/whiteegret/gennl.c
> > create mode 100644 security/whiteegret/gennl.h
> > create mode 100644 security/whiteegret/gennl_common.h
> > create mode 100644 security/whiteegret/init.c
> > create mode 100644 security/whiteegret/main.c
> > create mode 100644 security/whiteegret/print_msg.h
> > create mode 100644 security/whiteegret/request.c
> > create mode 100644 security/whiteegret/request.h
> > create mode 100644 security/whiteegret/returntoexec.h
> > create mode 100644 security/whiteegret/we.h
> > create mode 100644 security/whiteegret/we_common.h
> >
> > diff --git a/security/Kconfig b/security/Kconfig
> > index 93027fd..acfafb0 100644
> > --- a/security/Kconfig
> > +++ b/security/Kconfig
> > @@ -195,6 +195,7 @@ source security/tomoyo/Kconfig
> > source security/apparmor/Kconfig
> > source security/loadpin/Kconfig
> > source security/yama/Kconfig
> > +source security/whiteegret/Kconfig
> >
> > source security/integrity/Kconfig
> >
> > @@ -204,6 +205,7 @@ choice
> > default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
> > default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
> > default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
> > + default DEFAULT_SECURITY_WHITEEGRET if SECURITY_WHITEEGRET
> > default DEFAULT_SECURITY_DAC
> >
> > help
> > @@ -222,6 +224,9 @@ choice
> > config DEFAULT_SECURITY_APPARMOR
> > bool "AppArmor" if SECURITY_APPARMOR=y
> >
> > + config DEFAULT_SECURITY_WHITEEGRET
> > + bool "WhiteEgret" if SECURITY_WHITEEGRET=y
> > +
> > config DEFAULT_SECURITY_DAC
> > bool "Unix Discretionary Access Controls"
> >
> > @@ -233,7 +238,7 @@ config DEFAULT_SECURITY
> > default "smack" if DEFAULT_SECURITY_SMACK
> > default "tomoyo" if DEFAULT_SECURITY_TOMOYO
> > default "apparmor" if DEFAULT_SECURITY_APPARMOR
> > + default "whiteegret" if DEFAULT_SECURITY_WHITEEGRET
> > default "" if DEFAULT_SECURITY_DAC
> >
> > endmenu
> > -
> > diff --git a/security/Makefile b/security/Makefile
> > index f2d71cd..4fd9ff9 100644
> > --- a/security/Makefile
> > +++ b/security/Makefile
> > @@ -9,6 +9,7 @@ subdir-$(CONFIG_SECURITY_TOMOYO) += tomoyo
> > subdir-$(CONFIG_SECURITY_APPARMOR) += apparmor
> > subdir-$(CONFIG_SECURITY_YAMA) += yama
> > subdir-$(CONFIG_SECURITY_LOADPIN) += loadpin
> > +subdir-$(CONFIG_SECURITY_WHITEEGRET) += whiteegret
> >
> > # always enable default capabilities
> > obj-y += commoncap.o
> > @@ -24,6 +25,7 @@ obj-$(CONFIG_SECURITY_TOMOYO) +=
> tomoyo/
> > obj-$(CONFIG_SECURITY_APPARMOR) += apparmor/
> > obj-$(CONFIG_SECURITY_YAMA) += yama/
> > obj-$(CONFIG_SECURITY_LOADPIN) += loadpin/
> > +obj-$(CONFIG_SECURITY_WHITEEGRET) += whiteegret/
> > obj-$(CONFIG_CGROUP_DEVICE) += device_cgroup.o
> >
> > # Object integrity file lists
> > diff --git a/security/whiteegret/Kconfig b/security/whiteegret/Kconfig
> > new file mode 100644
> > index 0000000..923316f
> > --- /dev/null
> > +++ b/security/whiteegret/Kconfig
> > @@ -0,0 +1,21 @@
> > +config SECURITY_WHITEEGRET
> > + bool "WhiteEgret support"
> > + depends on SECURITY
> > + default n
> > + help
> > + This enables the WhiteEgret security module.
> > + WhiteEgret provides a whitelisting execution control
> capability,
> > + which helps to stop the execution of unauthorized software
> > + such as malware.
> > + You will also need a user application and an execution whitelist.
> > + If you are unsure how to answer this question, answer N.
> > +
> > +config SECURITY_WHITEEGRET_DRIVER
> > + bool "Use device driver in communication with user space"
> > + depends on SECURITY_WHITEEGRET
> > + default n
> > + help
> > + This option selects whether you use a device driver
> > + for communication between kernel space and user space.
> > + If you do not set this option, netlink is selected for
> > + communication between two spaces.
> > diff --git a/security/whiteegret/Makefile
> b/security/whiteegret/Makefile
> > new file mode 100644
> > index 0000000..ed8eb9f
> > --- /dev/null
> > +++ b/security/whiteegret/Makefile
> > @@ -0,0 +1,7 @@
> > +obj-$(CONFIG_SECURITY_WHITEEGRET) += whiteegret.o
> > +whiteegret-y := init.o main.o request.o
> > +ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +whiteegret-y += dd_com.o
> > +else
> > +whiteegret-y += gennl.o auth.o
> > +endif
> > diff --git a/security/whiteegret/auth.c b/security/whiteegret/auth.c
> > new file mode 100644
> > index 0000000..dd2c9eb
> > --- /dev/null
> > +++ b/security/whiteegret/auth.c
> > @@ -0,0 +1,19 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include "auth.h"
> > +
> > +/**
> > + * userproc_auth - Authenticate user's whitelisting application process.
> > + *
> > + * @authinfo: authentication credentials
> > + *
> > + * Returns 1 if authenticated, 0 otherwise.
> > + */
> > +int userproc_auth(char *authinfo)
> > +{
> > + return 1;
> > +}
> > diff --git a/security/whiteegret/auth.h b/security/whiteegret/auth.h
> > new file mode 100644
> > index 0000000..ddcd2dd
> > --- /dev/null
> > +++ b/security/whiteegret/auth.h
> > @@ -0,0 +1,12 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _AUTH_H
> > +#define _AUTH_H
> > +
> > +int userproc_auth(char *authinfo);
> > +
> > +#endif
> > diff --git a/security/whiteegret/dd_com.c
> b/security/whiteegret/dd_com.c
> > new file mode 100644
> > index 0000000..534c4d5
> > --- /dev/null
> > +++ b/security/whiteegret/dd_com.c
> > @@ -0,0 +1,79 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include "dd_com.h"
> > +#include "request.h"
> > +#include "we.h"
> > +#include "print_msg.h"
> > +
> > +struct task_struct *from_task;
> > +
> > +/**
> > + * start_we - Enable WhiteEgret.
> > + *
> > + * Returns pointer to we_req_q_head.
> > + */
> > +struct we_req_q_head *start_we(void)
> > +{
> > + if (from_task) {
> > + PRINT_WARNING("WhiteEgret has already started.\n");
> > + return NULL;
> > + }
> > +
> > + write_lock(&(we_q_head.lock));
> > + from_task = current;
> > + write_unlock(&(we_q_head.lock));
> > +
> > + return &we_q_head;
> > +}
> > +EXPORT_SYMBOL(start_we);
> > +
> > +/**
> > + * stop_we - Disable WhiteEgret.
> > + *
> > + * Returns -EPERM if the task invoking this function is not valid,
> > + * 0 otherwise.
> > + */
> > +int stop_we(void)
> > +{
> > + if (!from_task) {
> > + PRINT_WARNING("WhiteEgret has not started.\n");
> > + return -EPERM;
> > + }
> > + if (from_task != current) {
> > + PRINT_WARNING("This task is not registered to
> WhiteEgret.\n");
> > + return -EPERM;
> > + }
> > +
> > + we_req_q_cleanup();
> > +
> > + write_lock(&(we_q_head.lock));
> > + from_task = NULL;
> > + write_unlock(&(we_q_head.lock));
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(stop_we);
> > +
> > +/**
> > + * send_we_obj_info - Wait response from user's whitelisting application.
> > + *
> > + * @req: Pointer to struct we_req_q.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int send_we_obj_info(struct we_req_q *req)
> > +{
> > + /* If there exists queue waiting for this request req done,
> > + * then wake up it.
> > + */
> > + if (waitqueue_active(&(we_q_head.waitq)))
> > + wake_up(&(we_q_head.waitq));
> > +
> > + return wait_event_interruptible_timeout(req->waitq,
> > + (req->finish_flag == START_EXEC),
> > + WERESULTTIMEOUT);
> > +}
> > diff --git a/security/whiteegret/dd_com.h
> b/security/whiteegret/dd_com.h
> > new file mode 100644
> > index 0000000..9c7c5b8
> > --- /dev/null
> > +++ b/security/whiteegret/dd_com.h
> > @@ -0,0 +1,19 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _DD_COM_H
> > +#define _DD_COM_H
> > +
> > +#include "request.h"
> > +
> > +extern struct task_struct *from_task;
> > +
> > +extern struct we_req_q_head *start_we(void);
> > +extern int stop_we(void);
> > +
> > +int send_we_obj_info(struct we_req_q *req);
> > +
> > +#endif /* _DD_COM_H */
> > diff --git a/security/whiteegret/gennl.c b/security/whiteegret/gennl.c
> > new file mode 100644
> > index 0000000..10a1113
> > --- /dev/null
> > +++ b/security/whiteegret/gennl.c
> > @@ -0,0 +1,382 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include <linux/pid.h>
> > +#include <linux/cred.h>
> > +#include <linux/security.h>
> > +#include <net/genetlink.h>
> > +
> > +#include "auth.h"
> > +#include "gennl_common.h"
> > +#include "gennl.h"
> > +#include "returntoexec.h"
> > +#include "we_common.h"
> > +#include "we.h"
> > +#include "request.h"
> > +#include "print_msg.h"
> > +
> > +/* global variables */
> > +int from_pid = -1; /* pid of user's whitelisting application */
> > +struct net *from_net;
> > +u32 seq; /* sequence number */
> > +
> > +/* attribute policy */
> > +static struct nla_policy we_genl_policy[WE_A_MAX + 1] = {
> > + [WE_A_UNSPEC] = { .type = NLA_STRING },
> > + [WE_A_AUTHINFO] = { .type = NLA_BINARY,
> > + .len = AUTHINFOLENGTH },
> > + [WE_A_SHORTNAME] = { .type = NLA_STRING,
> > + .len = SHORTNAMELENGTH },
> > + [WE_A_PATH] = { .type = NLA_STRING },
> > + [WE_A_EXECPERMISSION] = { .type = NLA_FLAG },
> > +};
> > +
> > +/* operation definition */
> > +static struct genl_ops we_gnl_opses[] = {
> > + {
> > + .cmd = WE_C_UNSPEC,
> > + .flags = 0,
> > + .policy = we_genl_policy,
> > + .doit = we_unspec,
> > + .dumpit = NULL,
> > + },
> > + {
> > + .cmd = WE_C_USERREGISTER,
> > + .flags = 0,
> > + .policy = we_genl_policy,
> > + .doit = we_userregister,
> > + .dumpit = NULL,
> > + },
> > + {
> > + .cmd = WE_C_USERUNREGISTER,
> > + .flags = 0,
> > + .policy = we_genl_policy,
> > + .doit = we_userunregister,
> > + .dumpit = NULL,
> > + },
> > + {
> > + .cmd = WE_C_EXECPERMISSION,
> > + .flags = 0,
> > + .policy = we_genl_policy,
> > + .doit = we_execpermission,
> > + .dumpit = NULL,
> > + },
> > +};
> > +
> > +/* family definition */
> > +static struct genl_family we_gnl_family = {
> > + .name = WE_FAMILY_NAME,
> > + .version = WE_FAMILY_VERSION,
> > + .maxattr = WE_A_MAX,
> > + .ops = we_gnl_opses,
> > + .n_ops = ARRAY_SIZE(we_gnl_opses),
> > + .module = THIS_MODULE,
> > +};
> > +
> > +/**
> > + * we_netlink_register - Initialize netlink.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_netlink_register(void)
> > +{
> > + int rc;
> > +
> > + PRINT_INFO("%s starts.\n", __func__);
> > +
> > + rc = genl_register_family(&we_gnl_family);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + from_net = kmalloc(sizeof(struct net), GFP_KERNEL);
> > + if (!from_net) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + PRINT_WARNING("Netlink is registered by WhiteEgret.\n");
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_netlink_unregister - Close netlink.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_netlink_unregister(void)
> > +{
> > + int rc;
> > +
> > + PRINT_INFO("%s starts.\n", __func__);
> > +
> > + rc = genl_unregister_family(&we_gnl_family);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + if (from_net != NULL) {
> > + kfree(from_net);
> > + from_net = NULL;
> > + }
> > +
> > + PRINT_WARNING("Netlink is unregistered by WhiteEgret.\n");
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_unspec - Receive handler for unspecified.
> > + *
> > + * @buf: Pointer to struct sk_buff.
> > + * @info: Pointer to struct genl_info.
> > + *
> > + * Returns 0.
> > + */
> > +int we_unspec(struct sk_buff *buf, struct genl_info *info)
> > +{
> > + PRINT_INFO("Some message is handled at %s.\n", __func__);
> > +
> > + /* do something if necessary */
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_userregister - Register user's whitelisting application.
> > + *
> > + * @buf: Pointer to struct sk_buff.
> > + * @info: Pointer to struct genl_info.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_userregister(struct sk_buff *buf, struct genl_info *info)
> > +{
> > + int rc;
> > + struct pid *usrpid;
> > + struct task_struct *usrtask;
> > +#ifdef CONFIG_NET_NS
> > + const struct cred *usrcred;
> > +#endif
> > +
> > + PRINT_INFO("Some message is handled at %s.\n", __func__);
> > +
> > + if (from_pid != -1) {
> > + PRINT_WARNING
> > + ("The pid %d is already registered to
> WhiteEgret.\n",
> > + from_pid);
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + usrpid = find_get_pid(info->snd_portid);
> > + if (usrpid == NULL) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + usrtask = get_pid_task(usrpid, PIDTYPE_PID);
> > + if (usrtask == NULL) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > +#ifdef CONFIG_NET_NS
> > + usrcred = get_task_cred(usrtask);
> > + if (usrcred == NULL) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + if ((security_capable(usrcred, genl_info_net(info)->user_ns,
>
> Do not use the LSM interfaces (security_xxx) inside security modules.
> In this case you're probably looking for cap_capable() instead.

Thank you for all your advice.
I'll use cap_capable() instead.

>
> > + CAP_NET_ADMIN)) != 0) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +#endif
> > +
> > + rc = userproc_auth((char
> *)nla_data(info->attrs[WE_A_AUTHINFO]));
> > + if (rc <= 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + from_pid = info->snd_portid;
> > + memcpy(from_net, genl_info_net(info), sizeof(struct net));
> > +
> > + seq = info->snd_seq;
> > +
> > + PRINT_WARNING("The pid %d is registered to WhiteEgret.\n",
> from_pid);
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_userunregister - Unregister user's whitelisting application
> > + * invoked by itself.
> > + *
> > + * @buf: Pointer to struct sk_buff.
> > + * @info: Pointer to struct genl_info.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_userunregister(struct sk_buff *buf, struct genl_info *info)
> > +{
> > + int rc;
> > +
> > + PRINT_INFO("Some message is handled at %s.\n", __func__);
> > +
> > + if (from_pid != info->snd_portid) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + rc = userproc_auth((char
> *)nla_data(info->attrs[WE_A_AUTHINFO]));
> > + if (rc <= 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + PRINT_WARNING("The pid %d is unregistered to WhiteEgret.\n",
> from_pid);
> > +
> > + from_pid = -1;
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_execpermission - Receive handler for execution permission.
> > + *
> > + * @buf: Pointer to struct sk_buff.
> > + * @info: Pointer to struct genl_info.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_execpermission(struct sk_buff *buf, struct genl_info *info)
> > +{
> > + int rc = 0;
> > + struct we_req_data data;
> > +
> > + PRINT_INFO("Some message is handled at %s.\n", __func__);
> > +
> > + if (from_pid != info->snd_portid) {
> > + rc = -EACCES;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + data.seq = info->snd_seq;
> > + memcpy(&(data.shortname),
> nla_data(info->attrs[WE_A_SHORTNAME]),
> > + SHORTNAMELENGTH);
> > + if (we_req_q_search(&data) == NULL) {
> > + PRINT_INFO("(%s, %d) is not waiting for execution.\n",
> > + data.shortname, data.seq);
> > + return 0;
> > + }
> > +
> > + rc =
> returntoexec(nla_get_flag(info->attrs[WE_A_EXECPERMISSION]),
> > + &data);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + we_req_q_specific_pull(&data);
> > +
> > + PRINT_INFO("%s done (%s, %d).\n", __func__, data.shortname,
> data.seq);
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * send_we_obj_info - Send request for matching white list.
> > + *
> > + * @we_info: Pointer to struct we_obj_info.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int send_we_obj_info(struct we_obj_info *we_info)
> > +{
> > + int rc = 0;
> > + void *msg_head;
> > + struct sk_buff *send_skb;
> > +
> > + if ((from_pid == -1) || (from_net == NULL)) {
> > + rc = -EINVAL;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + send_skb = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
> > + if (send_skb == NULL) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + msg_head = genlmsg_put(send_skb, 0, seq, &we_gnl_family, 0,
> > + WE_C_EXECPERMISSION);
> > + if (msg_head == NULL) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + rc = nla_put_string(send_skb, WE_A_SHORTNAME,
> > + we_info->shortname);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + rc = nla_put_string(send_skb, WE_A_PATH, we_info->path);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + genlmsg_end(send_skb, msg_head);
> > +
> > + PRINT_INFO("Msg (%s, %s) sent to the pid %d (current
> process: %d)\n",
> > + we_info->shortname, we_info->path,
> > + from_pid, we_info->pid);
> > +
> > + rc = genlmsg_unicast(from_net, send_skb, from_pid);
> > + if (rc != 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * inc_seq - Increment sequence number.
> > + */
> > +void inc_seq(void)
> > +{
> > + seq += 1;
> > +}
> > +
> > +/**
> > + * get_seq - Return sequence number.
> > + *
> > + * Returns sequence number.
> > + */
> > +int get_seq(void)
> > +{
> > + return seq;
> > +}
> > diff --git a/security/whiteegret/gennl.h b/security/whiteegret/gennl.h
> > new file mode 100644
> > index 0000000..8b751b2
> > --- /dev/null
> > +++ b/security/whiteegret/gennl.h
> > @@ -0,0 +1,32 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _GENNL_H
> > +#define _GENNL_H
> > +
> > +#include <net/genetlink.h>
> > +#include "we.h"
> > +
> > +extern int from_pid;
> > +
> > +/* handler */
> > +int we_unspec(struct sk_buff *buf, struct genl_info *info);
> > +int we_userregister(struct sk_buff *buf, struct genl_info *info);
> > +int we_userunregister(struct sk_buff *buf, struct genl_info *info);
> > +int we_execpermission(struct sk_buff *buf, struct genl_info *info);
> > +
> > +/* register/unregister */
> > +int we_netlink_register(void);
> > +int we_netlink_unregister(void);
> > +
> > +/* send message to user space */
> > +int send_we_obj_info(struct we_obj_info *info);
> > +
> > +/* manipulate sequence number */
> > +void inc_seq(void);
> > +int get_seq(void);
> > +
> > +#endif /* _GENNL_H */
> > diff --git a/security/whiteegret/gennl_common.h
> b/security/whiteegret/gennl_common.h
> > new file mode 100644
> > index 0000000..e59615b
> > --- /dev/null
> > +++ b/security/whiteegret/gennl_common.h
> > @@ -0,0 +1,43 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _GENNL_COMMON_H
> > +#define _GENNL_COMMON_H
> > +
> > +/* UWA stands for User's Whitelisting Application */
> > +
> > +/* Netlink attributes */
> > +enum {
> > + WE_A_UNSPEC, /* unspecified message */
> > + WE_A_AUTHINFO, /* authentication info for UWA registration */
> > + WE_A_SHORTNAME, /* short name for an object to be examined */
> > + WE_A_PATH, /* full path for an object to be examined */
> > + WE_A_EXECPERMISSION, /* flag if the object is in the whitelist */
> > + __WE_A_MAX,
> > +};
> > +
> > +/* Number of netlink attributes */
> > +#define WE_A_MAX (__WE_A_MAX - 1)
> > +
> > +/* Name of genl_family */
> > +#define WE_FAMILY_NAME "WhiteEgret"
> > +
> > +/* Version number of genl_family */
> > +#define WE_FAMILY_VERSION 1
> > +
> > +/* Netlink commands */
> > +enum {
> > + WE_C_UNSPEC, /* unspecified message */
> > + WE_C_USERREGISTER, /* register UWA */
> > + WE_C_USERUNREGISTER,
> > + WE_C_EXECPERMISSION, /* execution permission */
> > + __WE_C_MAX,
> > +};
> > +
> > +/* Number of netlink commands */
> > +#define WE_C_MAX (__WE_C_MAX - 1)
> > +
> > +#endif /* _GENNL_COMMON_H */
> > diff --git a/security/whiteegret/init.c b/security/whiteegret/init.c
> > new file mode 100644
> > index 0000000..76254ef
> > --- /dev/null
> > +++ b/security/whiteegret/init.c
> > @@ -0,0 +1,69 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include <linux/module.h>
> > +#include <linux/sched.h>
> > +#include <linux/security.h>
> > +#include <linux/fs.h>
> > +#include <linux/lsm_hooks.h>
> > +#include "we.h"
> > +#include "print_msg.h"
> > +
> > +MODULE_LICENSE("GPL");
> > +MODULE_DESCRIPTION("WhiteEgret Linux Security Module");
> > +MODULE_VERSION("1.0.0");
> > +
> > +static int we_security_bprm_check(struct linux_binprm *bprm)
> > +{
> > + if (we_security_bprm_check_main(bprm) == -EPERM)
>
> EPERM means that you tried to do a privileged operation,
> but didn't have the required capabilities. This is more like
> EACCES, where you are asking to perform a mundane operation
> but don't have access to the object.
>
> This applies to most of the cases where you return EPERM.

I'll replace EPERM with EACCES.
Thank you.

Masanobu Koike

>
> > + return -EPERM;
> > +
> > + return 0;
> > +}
> > +
> > +static int we_security_mmap_check(struct file *file, unsigned long
> reqprot,
> > + unsigned long prot, unsigned long flags)
> > +{
> > + if (we_security_mmap_check_main(file, reqprot, flags) == -EPERM)
> > + return -EPERM;
> > +
> > + return 0;
> > +}
> > +
> > +static struct security_hook_list we_hooks[] = {
> > + LSM_HOOK_INIT(bprm_check_security, we_security_bprm_check),
> > + LSM_HOOK_INIT(mmap_file, we_security_mmap_check),
> > +};
> > +
> > +static int __init we_init(void)
> > +{
> > + int rc;
> > +
> > + if (!security_module_enable("whiteegret"))
> > + return 0;
> > +
> > + security_add_hooks(we_hooks, ARRAY_SIZE(we_hooks),
> "whiteegret");
> > +
> > + rc = we_specific_init();
> > + if (rc) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + PRINT_WARNING("WhiteEgret (LSM) initialized.\n");
> > +
> > + return 0;
> > +}
> > +
> > +static void __exit we_exit(void)
> > +{
> > + we_specific_exit();
> > +
> > + PRINT_WARNING("WhiteEgret (LSM) exited.\n");
> > +}
> > +
> > +module_init(we_init);
> > +module_exit(we_exit);
> > diff --git a/security/whiteegret/main.c b/security/whiteegret/main.c
> > new file mode 100644
> > index 0000000..8ba97db
> > --- /dev/null
> > +++ b/security/whiteegret/main.c
> > @@ -0,0 +1,340 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include <linux/semaphore.h>
> > +#include <linux/binfmts.h>
> > +#include <linux/dcache.h>
> > +#include <linux/fs.h>
> > +#include <linux/mman.h>
> > +#include "we_common.h"
> > +#include "we.h"
> > +#include "request.h"
> > +#include "print_msg.h"
> > +
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > +#include <linux/sched.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
> > +#include "dd_com.h"
> > +
> > +#else
> > +
> > +#include "gennl.h"
> > +#include "returntoexec.h"
> > +
> > +struct we_req_data reqdata; /* data of executable */
> > +struct semaphore we_result_lock;
> > +int result = -1; /* result of matching to white list
> */
> > +
> > +#endif
> > +
> > +static int send_receive_we_obj_info(
> > + struct we_obj_info *we_obj_info, int *checkresult);
> > +
> > +/**
> > + * we_specific_init - Initialize netlink and semaphore.
> > + *
> > + * Returns 0.
> > + */
> > +int we_specific_init(void)
> > +{
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + int rc = 0;
> > +
> > + rc = we_netlink_register();
> > + if (rc < 0) {
> > + PRINT_ERROR(rc);
> > + return rc;
> > + }
> > +
> > + sema_init(&we_result_lock, 1);
> > +#endif
> > + we_req_q_head_init();
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_specific_exit - Close netlink.
> > + *
> > + * Returns 0.
> > + */
> > +int we_specific_exit(void)
> > +{
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + we_netlink_unregister();
> > +#endif
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_check_main - Common function for security_bprm_check and mmap_file.
> > + *
> > + * @file: Pointer to struct file.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_check_main(struct file *file)
> > +{
> > + struct we_obj_info we_obj_info;
> > + char *pathnamebuf;
> > + char *new_pathnamebuf;
> > + char *pathname;
> > + char *shortnamebuf;
> > + int pathsize;
> > + int rc;
> > + int i;
> > + int checkresult;
> > +
> > + if (unlikely(file == NULL))
> > + return 0;
> > +
> > + pathsize = EXPECTPATHSIZE;
> > + pathnamebuf = kmalloc(pathsize, GFP_KERNEL);
> > + if (unlikely(!pathnamebuf)) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > + while (pathsize <= MAXPATHSIZE) {
> > + pathname = d_absolute_path(&file->f_path, pathnamebuf,
> > + pathsize-1);
> > + if (!IS_ERR(pathname))
> > + break;
> > +
> > + pathsize += ADDEDEXPECTPATHSIZE;
> > + new_pathnamebuf = krealloc(pathnamebuf, pathsize,
> > + GFP_KERNEL);
> > + if (unlikely(!new_pathnamebuf)) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > + pathnamebuf = new_pathnamebuf;
> > + }
> > + if (unlikely(pathsize >= MAXPATHSIZE)) {
> > + rc = -ENOMEM;
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > +
> > + shortnamebuf = pathname;
> > + for (i = 0; i < pathsize; i++) {
> > + if (pathname[i] == '\0')
> > + break;
> > + if (pathname[i] == '/')
> > + shortnamebuf = pathname + (i + 1);
> > + }
> > + strncpy(we_obj_info.shortname, shortnamebuf, SHORTNAMELENGTH);
> > + we_obj_info.path = pathname;
> > + we_obj_info.pid = current->pid;
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + we_obj_info.pathsize = strlen(pathname);
> > + we_obj_info.ppid = current->tgid;
> > +#endif
> > +
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + rc = down_timeout(&we_result_lock, WERESULTTIMEOUT);
> > + if (rc != 0)
> > + goto failure;
> > + inc_seq();
> > +#endif
> > + rc = send_receive_we_obj_info(&we_obj_info, &checkresult);
> > + if (rc < 0)
> > + goto failure;
> > +
> > + rc = checkresult;
> > +
> > + if (rc == -EPERM)
> > + PRINT_WARNING("block %s.\n", pathname);
> > + else
> > + PRINT_INFO("permit %s.\n", pathname);
> > +
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + up(&we_result_lock);
> > +#endif
> > +
> > +failure:
> > + if (pathnamebuf != NULL) {
> > + kfree(pathnamebuf);
> > + pathnamebuf = NULL;
> > + }
> > +
> > + if ((rc != 0) && (rc != -EPERM))
> > + PRINT_WARNING("Checking white list does not work.\n");
> > +
> > + return rc;
> > +}
> > +
> > +/**
> > + * send_receive_we_obj_info - Send message and wait.
> > + *
> > + * @we_obj_info: Pointer to struct we_obj_info.
> > + * @result: Pointer to result of matching to white list.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +static int send_receive_we_obj_info(
> > + struct we_obj_info *we_obj_info, int *checkresult)
> > +{
> > + int i;
> > + int rc;
> > + struct we_req_q req;
> > +
> > + we_req_q_init(&req, we_obj_info);
> > +
> > + if ((we_req_q_search(&(req.data))) == NULL) {
> > + rc = we_req_q_push(&req);
> > + if (rc < 0) {
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > + }
> > +
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > + for (i = 0; i < MAXCOMRETRY; i++) {
> > + rc = send_we_obj_info(&req);
> > +
> > + if (likely(req.finish_flag == START_EXEC)) {
> > + break;
> > + } else if (unlikely(rc == -ERESTARTSYS)) {
> > + rc = -EINVAL;
> > + break;
> > + }
> > + }
> > +
> > + we_req_q_pop(&req);
> > +
> > + if (unlikely(i >= MAXCOMRETRY) && req.finish_flag != START_EXEC)
> {
> > + rc = -EINVAL;
> > + PRINT_ERROR(rc);
> > + }
> > +
> > + *checkresult = req.permit;
> > +
> > + return rc;
> > +
> > +#else
> > +
> > + for (i = 0; i < MAXCOMRETRY; i++) {
> > + rc = send_we_obj_info(we_obj_info);
> > + if (rc < 0)
> > + continue;
> > +
> > + rc =
> wait_for_completion_interruptible_timeout(&(req.evt),
> > + WEGENNLTIMEOUT);
> > + if (rc <= 0) {
> > + if (unlikely(rc == -ERESTARTSYS)) {
> > + we_req_q_del(&(req.data));
> > + rc = -EINVAL;
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > + if (rc == 0)
> > + rc = -ETIMEDOUT;
> > + continue;
> > + } else {
> > + break;
> > + }
> > + }
> > +
> > + if (unlikely(i >= MAXCOMRETRY)) {
> > + we_req_q_del(&(req.data));
> > + rc = -EINVAL;
> > + PRINT_ERROR(rc);
> > + goto failure;
> > + }
> > +
> > + *checkresult = result;
> > +
> > + return 0;
> > +
> > +#endif /* CONFIG_SECURITY_WHITEEGRET_DRIVER */
> > +
> > +failure:
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + up(&we_result_lock);
> > +#endif
> > + return rc;
> > +}
> > +
> > +/**
> > + * we_security_bprm_check_main - Target for security_bprm_check.
> > + *
> > + * @bprm: Pointer to struct linux_binprm.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_security_bprm_check_main(struct linux_binprm *bprm)
> > +{
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + if (unlikely(!from_task))
> > +#else
> > + if (unlikely(from_pid == -1))
> > +#endif
> > + return 0;
> > +
> > + return we_check_main(bprm->file);
> > +}
> > +
> > +/**
> > + * we_security_mmap_check_main - Target for mmap_file.
> > + *
> > + * @file: Pointer to struct file to map.
> > + * @reqprot: Protection requested by the application.
> > + * @flags: Operational flags.
> > + *
> > + * Returns 0 if succeeded, < 0 otherwise.
> > + */
> > +int we_security_mmap_check_main(struct file *file,
> > + unsigned long reqprot, unsigned long flags) {
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + if (unlikely(!from_task))
> > +#else
> > + if (unlikely(from_pid == -1))
> > +#endif
> > + return 0;
> > +
> > + if (!(reqprot & PROT_EXEC))
> > + return 0;
> > +
> > + if ((flags & MAP_EXECUTABLE))
> > + return 0;
> > +
> > + if (!file)
> > + return 0;
> > +
> > + if (!file->f_path.dentry)
> > + return 0;
> > +
> > + return we_check_main(file);
> > +}
> > +
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > +/**
> > + * returntoexec - Record matching data and result.
> > + *
> > + * @result_: Result whether targeted object is included in the white
> list.
> > + * @reqdata_: Pointer to struct we_req_data.
> > + *
> > + * Returns 0.
> > + */
> > +int returntoexec(int result_, struct we_req_data *reqdata_)
> > +{
> > + if (!result_)
> > + result = -EPERM;
> > + else
> > + result = 0;
> > + memcpy(&reqdata, reqdata_, sizeof(struct we_req_data));
> > +
> > + return 0;
> > +}
> > +
> > +#endif
> > diff --git a/security/whiteegret/print_msg.h
> b/security/whiteegret/print_msg.h
> > new file mode 100644
> > index 0000000..2d6fe86
> > --- /dev/null
> > +++ b/security/whiteegret/print_msg.h
> > @@ -0,0 +1,19 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _PRINT_MSG_H
> > +#define _PRINT_MSG_H
> > +
> > +#include <linux/kernel.h>
> > +
> > +#define __STR(x) #x
> > +#define __STR2(x) __STR(x)
> > +#define ERROR_MSG "error %d at "__STR2(__LINE__)" on "
> __STR2(__FILE__)"\n"
> > +#define PRINT_ERROR(errno) pr_err("WhiteEgret: " ERROR_MSG, errno)
> > +#define PRINT_WARNING(fmt, ...) pr_warn("WhiteEgret: " fmt,
> ##__VA_ARGS__)
> > +#define PRINT_INFO(fmt, ...) pr_info("WhiteEgret: " fmt, ##__VA_ARGS__)
> > +
> > +#endif
> > diff --git a/security/whiteegret/request.c
> b/security/whiteegret/request.c
> > new file mode 100644
> > index 0000000..fc1da9b
> > --- /dev/null
> > +++ b/security/whiteegret/request.c
> > @@ -0,0 +1,248 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#include <linux/list.h>
> > +#include <linux/spinlock.h>
> > +#include <linux/rwlock_types.h>
> > +#include <linux/slab.h>
> > +#include <linux/string.h>
> > +#include "we_common.h"
> > +#include "request.h"
> > +#include "print_msg.h"
> > +
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +#include "gennl.h"
> > +#endif
> > +
> > +struct we_req_q_head we_q_head;
> > +
> > +static int match_we_req_data(struct we_req_data *data1,
> > + struct we_req_data *data2);
> > +
> > +/**
> > + * we_req_q_init - Initialize the global variable we_q_head.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_head_init(void)
> > +{
> > + rwlock_init(&(we_q_head.lock));
> > + INIT_LIST_HEAD(&(we_q_head.head));
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + init_waitqueue_head(&(we_q_head.waitq));
> > +#endif
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_req_q_push - Add queue to tail of the list.
> > + *
> > + * @queue: Pointer to we_req_q to be added to the list.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_push(struct we_req_q *queue)
> > +{
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + init_completion(&(queue->evt));
> > +#endif
> > +
> > + write_lock(&(we_q_head.lock));
> > + list_add_tail(&(queue->queue), &we_q_head.head);
> > + write_unlock(&(we_q_head.lock));
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_req_q_search - Search data in the list.
> > + *
> > + * @data: Pointer to we_req_data to be searched in the list.
> > + *
> > + * Returns pointer to data if data is found in the list,
> > + * NULL otherwise.
> > + */
> > +struct we_req_q *we_req_q_search(struct we_req_data *data)
> > +{
> > + struct list_head *p;
> > + struct we_req_q *req;
> > +
> > + read_lock(&(we_q_head.lock));
> > +
> > + list_for_each(p, &(we_q_head.head)) {
> > + req = list_entry(p, struct we_req_q, queue);
> > +
> > + if (match_we_req_data(data, &(req->data))) {
> > + read_unlock(&(we_q_head.lock));
> > + return req;
> > + }
> > + }
> > +
> > + read_unlock(&(we_q_head.lock));
> > +
> > + return NULL;
> > +}
> > +
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > +/**
> > + * we_req_q_init - Initialize queue.
> > + *
> > + * @req: Pointer to we_req_q to be initialized.
> > + * @info: Pointer to we_obj_info.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_init(struct we_req_q *req, struct we_obj_info *info)
> > +{
> > + req->finish_flag = STOP_EXEC;
> > + req->data.we_obj_info = info;
> > + req->permit = -EPERM;
> > + init_waitqueue_head(&req->waitq);
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_req_q_pop - Delete queue in the list.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_pop(struct we_req_q *queue)
> > +{
> > + write_lock(&(we_q_head.lock));
> > + list_del(&queue->queue);
> > + write_unlock(&(we_q_head.lock));
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * match_we_req_data - Compare two we_req_data data.
> > + *
> > + * @data1: Pointer to we_req_data
> > + * @data2: Pointer to we_req_data
> > + *
> > + * Returns 1 if all members of both we_req_data data are equal,
> > + * 0 otherwise.
> > + */
> > +static int match_we_req_data(struct we_req_data *data1,
> > + struct we_req_data *data2)
> > +{
> > + if (data1->we_obj_info->ppid == data2->we_obj_info->ppid)
> > + return 1;
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_req_q_cleanup - Cleaning up queues.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_cleanup(void)
> > +{
> > + struct list_head *p;
> > + struct we_req_q *req;
> > +
> > + write_lock(&(we_q_head.lock));
> > + list_for_each(p, &we_q_head.head) {
> > + req = list_entry(p, struct we_req_q, queue);
> > + req->finish_flag = START_EXEC;
> > + req->permit = -EINVAL;
> > + }
> > + write_unlock(&(we_q_head.lock));
> > +
> > + return 0;
> > +}
> > +
> > +#else /* CONFIG_SECURITY_WHITEEGRET_DRIVER */
> > +
> > +/**
> > + * we_req_q_init - Initialize queue.
> > + *
> > + * @req: Pointer to we_req_q to be initialized.
> > + * @info: Pointer to we_obj_info.
> > + *
> > + * Returns 0.
> > + */
> > +int we_req_q_init(struct we_req_q *req, struct we_obj_info *info)
> > +{
> > + strncpy(req->data.shortname, info->shortname, SHORTNAMELENGTH);
> > + req->data.seq = get_seq();
> > +
> > + return 0;
> > +}
> > +
> > +/**
> > + * we_req_q_specific_pull - Wait completion and delete queue in the list.
> > + *
> > + * @data: Pointer to we_req_data to be deleteed in the list.
> > + *
> > + * Returns WE_FOUND_REQUEST if data is found in the list,
> > + * WE_NOT_FOUND_REQUEST otherwise.
> > + */
> > +int we_req_q_specific_pull(struct we_req_data *data)
> > +{
> > + struct we_req_q *req;
> > +
> > + req = we_req_q_search(data);
> > + if (req != NULL) {
> > + write_lock(&(we_q_head.lock));
> > + complete_all(&(req->evt));
> > + list_del(&req->queue);
> > + write_unlock(&(we_q_head.lock));
> > + return WE_FOUND_REQUEST;
> > + }
> > +
> > + return WE_NOTFOUND_REQUEST;
> > +}
> > +
> > +/**
> > + * we_req_q_del - Delete queue in the list.
> > + *
> > + * @data: Pointer to we_req_data to be deleteed in the list.
> > + *
> > + * Returns WE_FOUND_REQUEST if data is found in the list,
> > + * WE_NOT_FOUND_REQUEST otherwise.
> > + */
> > +int we_req_q_del(struct we_req_data *data)
> > +{
> > + struct we_req_q *req;
> > +
> > + req = we_req_q_search(data);
> > + if (req != NULL) {
> > + write_lock(&(we_q_head.lock));
> > + list_del(&req->queue);
> > + write_unlock(&(we_q_head.lock));
> > + return WE_FOUND_REQUEST;
> > + }
> > +
> > + return WE_NOTFOUND_REQUEST;
> > +}
> > +
> > +/**
> > + * match_we_req_data - Compare two we_req_data data.
> > + *
> > + * @data1: Pointer to we_req_data
> > + * @data2: Pointer to we_req_data
> > + *
> > + * Returns 1 if all members of both we_req_data data are equal,
> > + * 0 otherwise.
> > + */
> > +static int match_we_req_data(struct we_req_data *data1,
> > + struct we_req_data *data2)
> > +{
> > + if (strncmp(data1->shortname, data2->shortname, SHORTNAMELENGTH)
> == 0) {
> > + if (data1->seq == data2->seq)
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +#endif /* CONFIG_SECURITY_WHITEEGRET_DRIVER */
> > diff --git a/security/whiteegret/request.h
> b/security/whiteegret/request.h
> > new file mode 100644
> > index 0000000..1ad9439
> > --- /dev/null
> > +++ b/security/whiteegret/request.h
> > @@ -0,0 +1,79 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _REQUEST_H
> > +#define _REQUEST_H
> > +
> > +#include <linux/sched.h>
> > +#include <linux/wait.h>
> > +
> > +#include "we.h"
> > +
> > +struct we_req_q_head {
> > + struct list_head head;
> > + rwlock_t lock;
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + wait_queue_head_t waitq;
> > +#endif
> > +};
> > +
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > +#define STOP_EXEC 0
> > +#define START_EXEC 1
> > +
> > +extern struct we_req_q_head we_q_head;
> > +
> > +/* Structure for information of request from kernel space to user space
> */
> > +struct we_req_data {
> > + struct we_obj_info *we_obj_info;
> > +};
> > +
> > +struct we_req_q {
> > + struct list_head queue;
> > + int finish_flag;
> > + struct we_req_data data;
> > + int permit;
> > + wait_queue_head_t waitq;
> > +};
> > +
> > +int we_req_q_pop(struct we_req_q *queue);
> > +int we_req_q_cleanup(void);
> > +
> > +#else /* CONFIG_SECURITY_WHITEEGRET_DRIVER */
> > +
> > +#include <linux/completion.h>
> > +
> > +/* Return values of searching queue of requests */
> > +enum {
> > + WE_NOTFOUND_REQUEST,
> > + WE_FOUND_REQUEST
> > +};
> > +
> > +/* Structure for information of request from kernel space to user space
> */
> > +struct we_req_data {
> > + char shortname[SHORTNAMELENGTH]; /* file name */
> > + u32 seq; /* sequence number */
> > +};
> > +
> > +/* Structure for queue of requests */
> > +struct we_req_q {
> > + struct list_head queue;
> > + struct completion evt;
> > + struct we_req_data data;
> > +};
> > +
> > +int we_req_q_specific_pull(struct we_req_data *data);
> > +int we_req_q_del(struct we_req_data *data);
> > +
> > +#endif /* CONFIG_SECURITY_WHITEEGRET_DRIVER */
> > +
> > +int we_req_q_head_init(void);
> > +int we_req_q_init(struct we_req_q *req, struct we_obj_info *info);
> > +int we_req_q_push(struct we_req_q *queue);
> > +struct we_req_q *we_req_q_search(struct we_req_data *data);
> > +
> > +#endif /* _REQUEST_H */
> > diff --git a/security/whiteegret/returntoexec.h
> b/security/whiteegret/returntoexec.h
> > new file mode 100644
> > index 0000000..7fae897
> > --- /dev/null
> > +++ b/security/whiteegret/returntoexec.h
> > @@ -0,0 +1,14 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _RETURNTOEXEC_H
> > +#define _RETURNTOEXEC_H
> > +
> > +#include "request.h"
> > +
> > +int returntoexec(int result_, struct we_req_data *reqdata_);
> > +
> > +#endif
> > diff --git a/security/whiteegret/we.h b/security/whiteegret/we.h
> > new file mode 100644
> > index 0000000..4a357e6
> > --- /dev/null
> > +++ b/security/whiteegret/we.h
> > @@ -0,0 +1,72 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _WE_H
> > +#define _WE_H
> > +
> > +#include <linux/binfmts.h>
> > +#include <linux/version.h>
> > +#include "we_common.h"
> > +
> > +/*
> > + * Initial size in byte of memory allocation to store the path
> > + * of an object file
> > + */
> > +#define EXPECTPATHSIZE 1023
> > +
> > +/*
> > + * Default size in byte to expand block that stores the path
> > + * of an object file when the memory block is too small
> > + * to store the path
> > + */
> > +#define ADDEDEXPECTPATHSIZE 1023
> > +
> > +/* Maximum length in byte of path of object file */
> > +#define MAXPATHSIZE 8184
> > +
> > +/*
> > + * Maximum number of retry for sending the same message
> > + * to user whitelisting application
> > + */
> > +#define MAXCOMRETRY 3
> > +
> > +/* Timeout value in millisecond to aquire the semaphore */
> > +#define WERESULTTIMEOUT 1000
> > +
> > +#ifndef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > +
> > +/*
> > + * Timeout value in jiffies to wait response from
> > + * user whitelisting application
> > + */
> > +#define WEGENNLTIMEOUT 1000
> > +
> > +#endif
> > +
> > +/*
> > + * Structure for an object to be tested whether it is contained
> > + * in the whitelist or not
> > + */
> > +struct we_obj_info {
> > + char shortname[SHORTNAMELENGTH]; /* short name for the object */
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + int pathsize;
> > +#endif
> > + char *path; /* full path to the object */
> > + pid_t pid;
> > +#ifdef CONFIG_SECURITY_WHITEEGRET_DRIVER
> > + pid_t ppid;
> > +#endif
> > +};
> > +
> > +int we_security_bprm_check_main(struct linux_binprm *bprm);
> > +int we_security_mmap_check_main(struct file *file,
> > + unsigned long reqprot, unsigned long flags);
> > +
> > +int we_specific_init(void);
> > +int we_specific_exit(void);
> > +
> > +#endif /* _WE_H */
> > diff --git a/security/whiteegret/we_common.h
> b/security/whiteegret/we_common.h
> > new file mode 100644
> > index 0000000..1288562
> > --- /dev/null
> > +++ b/security/whiteegret/we_common.h
> > @@ -0,0 +1,19 @@
> > +/*
> > + * WhiteEgret Linux Security Module
> > + *
> > + * Copyright (C) 2017 Toshiba Corporation
> > + */
> > +
> > +#ifndef _WE_COMMON_H
> > +#define _WE_COMMON_H
> > +
> > +/*
> > + * Maximum length in byte of authentication credentials
> > + * of user's whitelisting application
> > + */
> > +#define AUTHINFOLENGTH 0
> > +
> > +/* Maximum length in byte of name of executable file */
> > +#define SHORTNAMELENGTH 256
> > +
> > +#endif /* _WE_COMMON_H */
>

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