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Subject[patch 5/11] lsm stacking: actual stacker module
Adds the actual stacker LSM.

Signed-off-by: Serge Hallyn <serue@us.ibm.com>
---
security/Kconfig | 6
security/Makefile | 1
security/stacker.c | 1455 +++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 1462 insertions(+)
Index: linux-2.6.12-rc2/security/Kconfig
===================================================================
--- linux-2.6.12-rc2.orig/security/Kconfig 2005-05-23 09:55:11.000000000 -0500
+++ linux-2.6.12-rc2/security/Kconfig 2005-05-23 15:25:45.000000000 -0500
@@ -87,5 +87,11 @@

source security/selinux/Kconfig

+config SECURITY_STACKER
+ boolean "LSM Stacking"
+ depends on SECURITY
+ help
+ Stack multiple LSMs.
+
endmenu

Index: linux-2.6.12-rc2/security/Makefile
===================================================================
--- linux-2.6.12-rc2.orig/security/Makefile 2005-05-23 09:55:11.000000000 -0500
+++ linux-2.6.12-rc2/security/Makefile 2005-05-23 15:25:45.000000000 -0500
@@ -3,6 +3,7 @@
#

obj-$(CONFIG_KEYS) += keys/
+obj-$(CONFIG_SECURITY_STACKER) += stacker.o
subdir-$(CONFIG_SECURITY_SELINUX) += selinux

# if we don't select a security model, use the default capabilities
Index: linux-2.6.12-rc2/security/stacker.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-2.6.12-rc2/security/stacker.c 2005-05-23 15:25:39.000000000 -0500
@@ -0,0 +1,1455 @@
+/* "Stacker" Linux security module (LSM).
+ *
+ * Allows you to load (stack) multiple (additional) security modules.
+ *
+ * Copyright (C) 2002,2003,2004,2005 Serge E. Hallyn <serue@us.ibm.com>
+ * Copyright (C) 2002 David A. Wheeler <dwheeler@dwheeler.com>.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/security.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/capability.h>
+#include <linux/rwsem.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
+#include <linux/netdevice.h>
+#include <linux/string.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <asm/system.h>
+
+/* A module entry keeps track of one of the stacked modules
+ * Note that module_operations is aggregated instead of being pointed to -
+ * it's one less allocation and one less pointer to follow. */
+
+struct module_entry {
+ struct list_head lsm_list; /* list of active lsms */
+ struct list_head all_lsms; /* list of all lsms */
+ char *module_name;
+ int namelen;
+ struct security_operations module_operations;
+};
+static struct list_head stacked_modules; /* list of stacked modules */
+static struct list_head all_modules; /* list of all modules, including freed */
+
+static short sysfsfiles_registered;
+
+static spinlock_t stacker_lock;
+static int forbid_stacker_register; /* = 0; if 1, can't register */
+
+
+/*
+ * Workarounds for the fact that get and setprocattr are used only by
+ * selinux. (Maybe)
+ */
+static struct module_entry *selinux_module;
+
+/* Maximum number of characters in a stacked LSM module name */
+#define MAX_MODULE_NAME_LEN 128
+
+static int debug = 0;
+
+module_param(debug, bool, 0600);
+MODULE_PARM_DESC(debug, "Debug enabled or not");
+#define MY_NAME "stacker"
+#define stacker_dbg(fmt, arg...) \
+ do { \
+ if (debug) \
+ printk(KERN_DEBUG "%s: %s: " fmt , \
+ MY_NAME , __FUNCTION__ , \
+ ## arg); \
+ } while (0)
+
+/* Walk through the list of modules in stacked_modules
+ * and ask each (in turn) for their results, then return the
+ * results. If more than one module reports an error, return
+ * the FIRST error code.
+ *
+ * We return as soon as an error is returned.
+ */
+
+#define stack_for_each_entry(pos, head, member) \
+ for (pos = list_entry((head)->next, typeof(*pos), member); \
+ &pos->member != (head); \
+ pos = rcu_dereference(list_entry(pos->member.next, \
+ typeof(*pos), member)))
+
+/* to make this safe for module deletion, we would need to
+ * add a reference count to m as we had before
+ */
+#define RETURN_ERROR_IF_ANY_ERROR(BASE_FUNC, FUNC_WITH_ARGS) do { \
+ int result = 0; \
+ struct module_entry *m; \
+ rcu_read_lock(); \
+ stack_for_each_entry(m, &stacked_modules, lsm_list) { \
+ if (!m->module_operations.BASE_FUNC) \
+ continue; \
+ rcu_read_unlock(); \
+ result = m->module_operations.FUNC_WITH_ARGS; \
+ rcu_read_lock(); \
+ if (result) \
+ break; \
+ } \
+ rcu_read_unlock(); \
+ return result; \
+} while (0)
+
+/* Call all modules in stacked_modules' routine */
+#define CALL_ALL(BASE_FUNC, FUNC_WITH_ARGS) do { \
+ struct module_entry *m; \
+ rcu_read_lock(); \
+ stack_for_each_entry(m, &stacked_modules, lsm_list) { \
+ if (m->module_operations.BASE_FUNC) { \
+ rcu_read_unlock(); \
+ m->module_operations.FUNC_WITH_ARGS; \
+ rcu_read_lock(); \
+ } \
+ } \
+ rcu_read_unlock(); \
+} while (0)
+
+#define FREE_ALL(BASE_FREE,FREE_WITH_ARGS) do { \
+ struct module_entry *m; \
+ rcu_read_lock(); \
+ stack_for_each_entry(m, &stacked_modules, lsm_list ) { \
+ if (m->module_operations.BASE_FREE) { \
+ rcu_read_unlock(); \
+ m->module_operations.FREE_WITH_ARGS; \
+ rcu_read_lock(); \
+ } \
+ } \
+ rcu_read_unlock(); \
+} while (0)
+
+#define ALLOC_SECURITY(BASE_FUNC,FUNC_WITH_ARGS,BASE_FREE,FREE_WITH_ARGS) do { \
+ int result; \
+ struct module_entry *m, *m2; \
+ rcu_read_lock(); \
+ stack_for_each_entry(m, &stacked_modules, lsm_list) { \
+ if (!m->module_operations.BASE_FUNC) \
+ continue; \
+ rcu_read_unlock(); \
+ result = m->module_operations.FUNC_WITH_ARGS; \
+ rcu_read_lock(); \
+ if (result) \
+ goto bad; \
+ } \
+ rcu_read_unlock(); \
+ return 0; \
+bad: \
+ stack_for_each_entry(m2, &all_modules, all_lsms) { \
+ if (m == m2) \
+ break; \
+ if (!m2->module_operations.BASE_FREE) \
+ continue; \
+ rcu_read_unlock(); \
+ m2->module_operations.FREE_WITH_ARGS; \
+ rcu_read_lock(); \
+ } \
+ rcu_read_unlock(); \
+ return result; \
+} while (0)
+
+/*
+ * The list of functions for stacker_ops
+ */
+static int stacker_ptrace (struct task_struct *parent, struct task_struct *child)
+{
+ RETURN_ERROR_IF_ANY_ERROR(ptrace,ptrace(parent, child));
+}
+
+static int stacker_capget (struct task_struct *target, kernel_cap_t * effective,
+ kernel_cap_t * inheritable, kernel_cap_t * permitted)
+{
+ RETURN_ERROR_IF_ANY_ERROR(capget,capget(target, effective, inheritable, permitted));
+}
+
+static int stacker_capset_check (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ RETURN_ERROR_IF_ANY_ERROR(capset_check,capset_check(target, effective, inheritable, permitted));
+}
+
+static void stacker_capset_set (struct task_struct *target,
+ kernel_cap_t * effective,
+ kernel_cap_t * inheritable,
+ kernel_cap_t * permitted)
+{
+ CALL_ALL(capset_set,capset_set(target, effective, inheritable, permitted));
+}
+
+static int stacker_acct (struct file *file)
+{
+ RETURN_ERROR_IF_ANY_ERROR(acct,acct(file));
+}
+
+static int stacker_capable (struct task_struct *tsk, int cap)
+{
+ RETURN_ERROR_IF_ANY_ERROR(capable,capable(tsk,cap));
+}
+
+
+static int stacker_sysctl (struct ctl_table * table, int op)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sysctl,sysctl(table, op));
+}
+
+static int stacker_quotactl (int cmds, int type, int id, struct super_block *sb)
+{
+ RETURN_ERROR_IF_ANY_ERROR(quotactl,quotactl(cmds,type,id,sb));
+}
+
+static int stacker_quota_on (struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(quota_on,quota_on(dentry));
+}
+
+static int stacker_syslog (int type)
+{
+ RETURN_ERROR_IF_ANY_ERROR(syslog,syslog(type));
+}
+
+static int stacker_settime(struct timespec *ts, struct timezone *tz)
+{
+ RETURN_ERROR_IF_ANY_ERROR(settime,settime(ts,tz));
+}
+
+/*
+ * vm_enough_memory performs actual updates of vm state. Most
+ * modules, including dummy, use the __vm_enough_memory helper
+ * to do this for them.
+ * This means we can't call more than one module's vm_enough.
+ * So we call the first module's, or if no modules are loaded,
+ * we call dummy_vm_enough_memory.
+ */
+static int stacker_vm_enough_memory(long pages)
+{
+ int result;
+ struct module_entry *m;
+
+ if (unlikely(list_empty(&stacked_modules)))
+ goto no_module_vmenough;
+
+ rcu_read_lock();
+ stack_for_each_entry(m, &stacked_modules, lsm_list) {
+ if (!m->module_operations.vm_enough_memory)
+ continue;
+ rcu_read_unlock();
+ result = m->module_operations.vm_enough_memory(pages);
+ return result;
+ }
+ rcu_read_unlock();
+
+no_module_vmenough:
+ result = __vm_enough_memory(pages, capable(CAP_SYS_ADMIN));
+ return result;
+}
+
+/*
+ * Each module may have it's own idea of how to set netlink perms.
+ * We use the intersection of all as the final alloted perms.
+ */
+static int stacker_netlink_send (struct sock *sk, struct sk_buff *skb)
+{
+ kernel_cap_t tmpcap = ~0;
+ int result = 0;
+ struct module_entry *m;
+
+ rcu_read_lock();
+ stack_for_each_entry(m, &stacked_modules, lsm_list) {
+ if (!m->module_operations.netlink_send)
+ continue;
+ NETLINK_CB(skb).eff_cap = ~0;
+ rcu_read_unlock();
+ result = m->module_operations.netlink_send(sk, skb);
+ rcu_read_lock();
+ tmpcap &= NETLINK_CB(skb).eff_cap;
+ if (result)
+ break;
+ }
+ rcu_read_unlock();
+
+ NETLINK_CB(skb).eff_cap = tmpcap;
+ return result;
+}
+
+
+static int stacker_netlink_recv (struct sk_buff *skb)
+{
+ RETURN_ERROR_IF_ANY_ERROR(netlink_recv,netlink_recv(skb));
+}
+
+static int stacker_bprm_alloc_security (struct linux_binprm *bprm)
+{
+ ALLOC_SECURITY(bprm_alloc_security,bprm_alloc_security(bprm),bprm_free_security,bprm_free_security(bprm));
+}
+
+static void stacker_bprm_free_security (struct linux_binprm *bprm)
+{
+ FREE_ALL(bprm_free_security,bprm_free_security(bprm));
+}
+
+static void stacker_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
+{
+ CALL_ALL(bprm_apply_creds,bprm_apply_creds(bprm, unsafe));
+}
+
+static void stacker_bprm_post_apply_creds (struct linux_binprm * bprm)
+{
+ CALL_ALL(bprm_post_apply_creds,bprm_post_apply_creds(bprm));
+}
+
+static int stacker_bprm_set_security (struct linux_binprm *bprm)
+{
+ RETURN_ERROR_IF_ANY_ERROR(bprm_set_security,bprm_set_security(bprm));
+}
+
+static int stacker_bprm_check_security (struct linux_binprm *bprm)
+{
+ RETURN_ERROR_IF_ANY_ERROR(bprm_check_security,bprm_check_security(bprm));
+}
+
+static int stacker_bprm_secureexec (struct linux_binprm *bprm)
+{
+ RETURN_ERROR_IF_ANY_ERROR(bprm_secureexec,bprm_secureexec(bprm));
+}
+
+static int stacker_sb_alloc_security (struct super_block *sb)
+{
+ ALLOC_SECURITY(sb_alloc_security,sb_alloc_security(sb),sb_free_security,sb_free_security(sb));
+}
+
+static void stacker_sb_free_security (struct super_block *sb)
+{
+ FREE_ALL(sb_free_security,sb_free_security(sb));
+}
+
+static int stacker_sb_copy_data (struct file_system_type *type,
+ void *orig, void *copy)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_copy_data,sb_copy_data(type,orig,copy));
+}
+
+static int stacker_sb_kern_mount (struct super_block *sb, void *data)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_kern_mount,sb_kern_mount(sb, data));
+}
+
+static int stacker_sb_statfs (struct super_block *sb)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_statfs,sb_statfs(sb));
+}
+
+static int stacker_mount (char *dev_name, struct nameidata *nd, char *type,
+ unsigned long flags, void *data)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_mount,sb_mount(dev_name, nd, type, flags, data));
+}
+
+static int stacker_check_sb (struct vfsmount *mnt, struct nameidata *nd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_check_sb,sb_check_sb(mnt, nd));
+}
+
+static int stacker_umount (struct vfsmount *mnt, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_umount,sb_umount(mnt, flags));
+}
+
+static void stacker_umount_close (struct vfsmount *mnt)
+{
+ CALL_ALL(sb_umount_close,sb_umount_close(mnt));
+}
+
+static void stacker_umount_busy (struct vfsmount *mnt)
+{
+ CALL_ALL(sb_umount_busy,sb_umount_busy(mnt));
+}
+
+static void stacker_post_remount (struct vfsmount *mnt, unsigned long flags,
+ void *data)
+{
+ CALL_ALL(sb_post_remount,sb_post_remount(mnt, flags, data));
+}
+
+
+static void stacker_post_mountroot (void)
+{
+ CALL_ALL(sb_post_mountroot,sb_post_mountroot());
+}
+
+static void stacker_post_addmount (struct vfsmount *mnt, struct nameidata *nd)
+{
+ CALL_ALL(sb_post_addmount,sb_post_addmount(mnt, nd));
+}
+
+static int stacker_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sb_pivotroot,sb_pivotroot(old_nd, new_nd));
+}
+
+static void stacker_post_pivotroot (struct nameidata *old_nd, struct nameidata *new_nd)
+{
+ CALL_ALL(sb_post_pivotroot,sb_post_pivotroot(old_nd, new_nd));
+}
+
+static int stacker_inode_alloc_security (struct inode *inode)
+{
+ ALLOC_SECURITY(inode_alloc_security,inode_alloc_security(inode),inode_free_security,inode_free_security(inode));
+}
+
+static void stacker_inode_free_security (struct inode *inode)
+{
+ FREE_ALL(inode_free_security,inode_free_security(inode));
+}
+
+static int stacker_inode_create (struct inode *inode, struct dentry *dentry,
+ int mask)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_create,inode_create(inode, dentry, mask));
+}
+
+static void stacker_inode_post_create (struct inode *inode,
+ struct dentry *dentry, int mask)
+{
+ CALL_ALL(inode_post_create,inode_post_create(inode, dentry, mask));
+}
+
+static int stacker_inode_link (struct dentry *old_dentry, struct inode *inode,
+ struct dentry *new_dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_link,inode_link(old_dentry, inode, new_dentry));
+}
+
+static void stacker_inode_post_link (struct dentry *old_dentry,
+ struct inode *inode,
+ struct dentry *new_dentry)
+{
+ CALL_ALL(inode_post_link,inode_post_link(old_dentry, inode, new_dentry));
+}
+
+static int stacker_inode_unlink (struct inode *inode, struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_unlink,inode_unlink(inode, dentry));
+}
+
+static int stacker_inode_symlink (struct inode *inode, struct dentry *dentry,
+ const char *name)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_symlink,inode_symlink(inode, dentry, name));
+}
+
+static void stacker_inode_post_symlink (struct inode *inode,
+ struct dentry *dentry, const char *name)
+{
+ CALL_ALL(inode_post_symlink,inode_post_symlink(inode, dentry, name));
+}
+
+static int stacker_inode_mkdir (struct inode *inode, struct dentry *dentry,
+ int mask)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_mkdir,inode_mkdir(inode, dentry, mask));
+}
+
+static void stacker_inode_post_mkdir (struct inode *inode,
+ struct dentry *dentry, int mask)
+{
+ CALL_ALL(inode_post_mkdir,inode_post_mkdir(inode, dentry, mask));
+}
+
+static int stacker_inode_rmdir (struct inode *inode, struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_rmdir,inode_rmdir(inode, dentry));
+}
+
+static int stacker_inode_mknod (struct inode *inode, struct dentry *dentry,
+ int major, dev_t minor)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_mknod,inode_mknod(inode, dentry, major, minor));
+}
+
+static void stacker_inode_post_mknod (struct inode *inode,
+ struct dentry *dentry, int major, dev_t minor)
+{
+ CALL_ALL(inode_post_mknod,inode_post_mknod(inode, dentry, major, minor));
+}
+
+static int stacker_inode_rename (struct inode *old_inode,
+ struct dentry *old_dentry,
+ struct inode *new_inode,
+ struct dentry *new_dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_rename,inode_rename(old_inode, old_dentry,
+ new_inode, new_dentry));
+}
+
+static void stacker_inode_post_rename (struct inode *old_inode,
+ struct dentry *old_dentry,
+ struct inode *new_inode,
+ struct dentry *new_dentry)
+{
+ CALL_ALL(inode_post_rename,inode_post_rename(old_inode, old_dentry,
+ new_inode, new_dentry));
+}
+
+static int stacker_inode_readlink (struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_readlink,inode_readlink(dentry));
+}
+
+static int stacker_inode_follow_link (struct dentry *dentry,
+ struct nameidata *nameidata)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_follow_link,inode_follow_link(dentry, nameidata));
+}
+
+static int stacker_inode_permission (struct inode *inode, int mask,
+ struct nameidata *nd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_permission,inode_permission(inode, mask, nd));
+}
+
+static int stacker_inode_setattr (struct dentry *dentry, struct iattr *iattr)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_setattr,inode_setattr(dentry, iattr));
+}
+
+static int stacker_inode_getattr (struct vfsmount *mnt, struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_getattr,inode_getattr(mnt,dentry));
+}
+
+static void stacker_inode_delete (struct inode *ino)
+{
+ CALL_ALL(inode_delete,inode_delete(ino));
+}
+
+static int stacker_inode_setxattr (struct dentry *dentry, char *name,
+ void *value, size_t size, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_setxattr,inode_setxattr(dentry,name,value,size,flags));
+}
+
+static void stacker_inode_post_setxattr (struct dentry *dentry, char *name, void *value,
+ size_t size, int flags)
+{
+ CALL_ALL(inode_post_setxattr,inode_post_setxattr(dentry,name,value,size,flags));
+}
+
+static int stacker_inode_getxattr (struct dentry *dentry, char *name)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_getxattr,inode_getxattr(dentry,name));
+}
+
+static int stacker_inode_listxattr (struct dentry *dentry)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_listxattr,inode_listxattr(dentry));
+}
+
+static int stacker_inode_removexattr (struct dentry *dentry, char *name)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_removexattr,inode_removexattr(dentry,name));
+}
+
+static int stacker_inode_getsecurity(struct inode *inode, const char *name, void *buffer, size_t size)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_getsecurity,inode_getsecurity(inode,name,buffer,size));
+}
+
+static int stacker_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_setsecurity,inode_setsecurity(inode,name,value,size,flags));
+}
+
+static int stacker_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
+{
+ RETURN_ERROR_IF_ANY_ERROR(inode_listsecurity,inode_listsecurity(inode,buffer, buffer_size));
+}
+
+static int stacker_file_permission (struct file *file, int mask)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_permission,file_permission(file,mask));
+}
+
+static int stacker_file_alloc_security (struct file *file)
+{
+ ALLOC_SECURITY(file_alloc_security,file_alloc_security(file),file_free_security,file_free_security(file));
+}
+
+static void stacker_file_free_security (struct file *file)
+{
+ FREE_ALL(file_free_security,file_free_security(file));
+}
+
+static int stacker_file_ioctl (struct file *file, unsigned int command,
+ unsigned long arg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_ioctl,file_ioctl(file,command,arg));
+}
+
+static int stacker_file_mmap (struct file *file, unsigned long reqprot,
+ unsigned long prot, unsigned long flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_mmap,file_mmap(file, reqprot, prot, flags));
+}
+
+static int stacker_file_mprotect (struct vm_area_struct *vma,
+ unsigned long reqprot, unsigned long prot)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_mprotect,file_mprotect(vma,reqprot,prot));
+}
+
+static int stacker_file_lock (struct file *file, unsigned int cmd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_lock,file_lock(file,cmd));
+}
+
+static int stacker_file_fcntl (struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_fcntl,file_fcntl(file,cmd,arg));
+}
+
+static int stacker_file_set_fowner (struct file *file)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_set_fowner,file_set_fowner(file));
+}
+
+static int stacker_file_send_sigiotask (struct task_struct *tsk,
+ struct fown_struct *fown, int sig)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_send_sigiotask,file_send_sigiotask(tsk,fown,sig));
+}
+
+static int stacker_file_receive (struct file *file)
+{
+ RETURN_ERROR_IF_ANY_ERROR(file_receive,file_receive(file));
+}
+
+static int stacker_task_create (unsigned long clone_flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_create,task_create(clone_flags));
+}
+
+static int stacker_task_alloc_security (struct task_struct *p)
+{
+ ALLOC_SECURITY(task_alloc_security,task_alloc_security(p),task_free_security,task_free_security(p));
+}
+
+static void stacker_task_free_security (struct task_struct *p)
+{
+ FREE_ALL(task_free_security,task_free_security(p));
+}
+
+static int stacker_task_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setuid,task_setuid(id0,id1,id2,flags));
+}
+
+static int stacker_task_post_setuid (uid_t id0, uid_t id1, uid_t id2, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_post_setuid,task_post_setuid(id0,id1,id2,flags));
+}
+
+static int stacker_task_setgid (gid_t id0, gid_t id1, gid_t id2, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setgid,task_setgid(id0,id1,id2,flags));
+}
+
+static int stacker_task_setpgid (struct task_struct *p, pid_t pgid)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setpgid,task_setpgid(p,pgid));
+}
+
+static int stacker_task_getpgid (struct task_struct *p)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_getpgid,task_getpgid(p));
+}
+
+static int stacker_task_getsid (struct task_struct *p)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_getsid,task_getsid(p));
+}
+
+static int stacker_task_setgroups (struct group_info *group_info)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setgroups,task_setgroups(group_info));
+}
+
+static int stacker_task_setnice (struct task_struct *p, int nice)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setnice,task_setnice(p,nice));
+}
+
+static int stacker_task_setrlimit (unsigned int resource, struct rlimit *new_rlim)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setrlimit,task_setrlimit(resource,new_rlim));
+}
+
+static int stacker_task_setscheduler (struct task_struct *p, int policy,
+ struct sched_param *lp)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_setscheduler,task_setscheduler(p,policy,lp));
+}
+
+static int stacker_task_getscheduler (struct task_struct *p)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_getscheduler,task_getscheduler(p));
+}
+
+static int stacker_task_wait (struct task_struct *p)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_wait,task_wait(p));
+}
+
+static int stacker_task_kill (struct task_struct *p, struct siginfo *info,
+ int sig)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_kill,task_kill(p,info,sig));
+}
+
+static int stacker_task_prctl (int option, unsigned long arg2, unsigned long arg3,
+ unsigned long arg4, unsigned long arg5)
+{
+ RETURN_ERROR_IF_ANY_ERROR(task_prctl,task_prctl(option,arg2,arg3,arg4,arg5));
+}
+
+static void stacker_task_reparent_to_init (struct task_struct *p)
+{
+ /* Note that the dummy version of this hook would call:
+ * p->euid = p->fsuid = 0; */
+
+ CALL_ALL(task_reparent_to_init,task_reparent_to_init(p));
+}
+
+static void stacker_task_to_inode(struct task_struct *p, struct inode *inode)
+{
+ CALL_ALL(task_to_inode,task_to_inode(p, inode));
+}
+
+#ifdef CONFIG_SECURITY_NETWORK
+static int stacker_socket_create (int family, int type, int protocol, int kern)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_create,socket_create(family,type,protocol,kern));
+}
+
+static void stacker_socket_post_create (struct socket *sock, int family,
+ int type, int protocol, int kern)
+{
+ CALL_ALL(socket_post_create,socket_post_create(sock,family,type,protocol,kern));
+}
+
+static int stacker_socket_bind (struct socket *sock, struct sockaddr *address,
+ int addrlen)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_bind,socket_bind(sock,address,addrlen));
+}
+
+static int stacker_socket_connect (struct socket *sock,
+ struct sockaddr *address, int addrlen)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_connect,socket_connect(sock,address,addrlen));
+}
+
+static int stacker_socket_listen (struct socket *sock, int backlog)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_listen,socket_listen(sock,backlog));
+}
+
+static int stacker_socket_accept (struct socket *sock, struct socket *newsock)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_accept,socket_accept(sock,newsock));
+}
+
+static void stacker_socket_post_accept (struct socket *sock,
+ struct socket *newsock)
+{
+ CALL_ALL(socket_post_accept,socket_post_accept(sock,newsock));
+}
+
+static int stacker_socket_sendmsg (struct socket *sock, struct msghdr *msg,
+ int size)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_sendmsg,socket_sendmsg(sock,msg,size));
+}
+
+static int stacker_socket_recvmsg (struct socket *sock, struct msghdr *msg,
+ int size, int flags)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_recvmsg,socket_recvmsg(sock,msg,size,flags));
+}
+
+static int stacker_socket_getsockname (struct socket *sock)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_getsockname,socket_getsockname(sock));
+}
+
+static int stacker_socket_getpeername (struct socket *sock)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_getpeername,socket_getpeername(sock));
+}
+
+static int stacker_socket_setsockopt (struct socket *sock, int level, int optname)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_setsockopt,socket_setsockopt(sock,level,optname));
+}
+
+static int stacker_socket_getsockopt (struct socket *sock, int level, int optname)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_getsockopt,socket_getsockopt(sock,level,optname));
+}
+
+static int stacker_socket_shutdown (struct socket *sock, int how)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_shutdown,socket_shutdown(sock,how));
+}
+
+static int stacker_socket_sock_rcv_skb (struct sock *sk, struct sk_buff *skb)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_sock_rcv_skb,socket_sock_rcv_skb(sk,skb));
+}
+
+static int stacker_unix_stream_connect (struct socket *sock,
+ struct socket *other, struct sock *newsk)
+{
+ RETURN_ERROR_IF_ANY_ERROR(unix_stream_connect,unix_stream_connect(sock,other,newsk));
+}
+
+static int stacker_unix_may_send (struct socket *sock,
+ struct socket *other)
+{
+ RETURN_ERROR_IF_ANY_ERROR(unix_may_send,unix_may_send(sock,other));
+}
+
+static int stacker_socket_getpeersec(struct socket *sock,
+ char __user *optval, int __user *optlen, unsigned len)
+{
+ RETURN_ERROR_IF_ANY_ERROR(socket_getpeersec,socket_getpeersec(sock,optval,optlen,len));
+}
+
+static int stacker_sk_alloc_security(struct sock *sk, int family,
+ int priority)
+{
+ ALLOC_SECURITY(sk_alloc_security,sk_alloc_security(sk,family,priority),sk_free_security,sk_free_security(sk));
+}
+
+static void stacker_sk_free_security (struct sock *sk)
+{
+ FREE_ALL(sk_free_security,sk_free_security(sk));
+}
+
+#endif
+
+static int stacker_ipc_permission (struct kern_ipc_perm *ipcp, short flag)
+{
+ RETURN_ERROR_IF_ANY_ERROR(ipc_permission,ipc_permission(ipcp,flag));
+}
+
+static int stacker_msg_msg_alloc_security (struct msg_msg *msg)
+{
+ ALLOC_SECURITY(msg_msg_alloc_security,msg_msg_alloc_security(msg),msg_msg_free_security,msg_msg_free_security(msg));
+}
+
+static void stacker_msg_msg_free_security (struct msg_msg *msg)
+{
+ FREE_ALL(msg_msg_free_security,msg_msg_free_security(msg));
+}
+
+static int stacker_msg_queue_alloc_security (struct msg_queue *msq)
+{
+ ALLOC_SECURITY(msg_queue_alloc_security,msg_queue_alloc_security(msq),msg_queue_free_security,msg_queue_free_security(msq));
+}
+
+static void stacker_msg_queue_free_security (struct msg_queue *msq)
+{
+ FREE_ALL(msg_queue_free_security,msg_queue_free_security(msq));
+}
+
+static int stacker_msg_queue_associate (struct msg_queue *msq, int msqflg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(msg_queue_associate,msg_queue_associate(msq,msqflg));
+}
+
+static int stacker_msg_queue_msgctl (struct msg_queue *msq, int cmd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(msg_queue_msgctl,msg_queue_msgctl(msq,cmd));
+}
+
+static int stacker_msg_queue_msgsnd (struct msg_queue *msq, struct msg_msg *msg,
+ int msgflg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(msg_queue_msgsnd,msg_queue_msgsnd(msq,msg,msgflg));
+}
+
+static int stacker_msg_queue_msgrcv (struct msg_queue *msq, struct msg_msg *msg,
+ struct task_struct *target, long type,
+ int mode)
+{
+ RETURN_ERROR_IF_ANY_ERROR(msg_queue_msgrcv,msg_queue_msgrcv(msq,msg,target,type,mode));
+}
+
+static int stacker_shm_alloc_security (struct shmid_kernel *shp)
+{
+ ALLOC_SECURITY(shm_alloc_security,shm_alloc_security(shp),shm_free_security,shm_free_security(shp));
+}
+
+static void stacker_shm_free_security (struct shmid_kernel *shp)
+{
+ FREE_ALL(shm_free_security,shm_free_security(shp));
+}
+
+static int stacker_shm_associate (struct shmid_kernel *shp, int shmflg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(shm_associate,shm_associate(shp,shmflg));
+}
+
+static int stacker_shm_shmctl (struct shmid_kernel *shp, int cmd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(shm_shmctl,shm_shmctl(shp,cmd));
+}
+
+static int stacker_shm_shmat (struct shmid_kernel *shp, char *shmaddr,
+ int shmflg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(shm_shmat,shm_shmat(shp,shmaddr,shmflg));
+}
+
+static int stacker_sem_alloc_security (struct sem_array *sma)
+{
+ ALLOC_SECURITY(sem_alloc_security,sem_alloc_security(sma),sem_free_security,sem_free_security(sma));
+}
+
+static void stacker_sem_free_security (struct sem_array *sma)
+{
+ FREE_ALL(sem_free_security,sem_free_security(sma));
+}
+
+static int stacker_sem_associate (struct sem_array *sma, int semflg)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sem_associate,sem_associate(sma,semflg));
+}
+
+static int stacker_sem_semctl (struct sem_array *sma, int cmd)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sem_semctl,sem_semctl(sma,cmd));
+}
+
+static int stacker_sem_semop (struct sem_array *sma,
+ struct sembuf *sops, unsigned nsops, int alter)
+{
+ RETURN_ERROR_IF_ANY_ERROR(sem_semop,sem_semop(sma,sops,nsops,alter));
+}
+
+static void stacker_d_instantiate (struct dentry *dentry, struct inode *inode)
+{
+ CALL_ALL(d_instantiate,d_instantiate(dentry,inode));
+}
+
+static int
+stacker_getprocattr(struct task_struct *p, char *name, void *value, size_t size)
+{
+ if (!selinux_module)
+ return -EINVAL;
+ if (!selinux_module->module_operations.getprocattr)
+ return -EINVAL;
+ return selinux_module->module_operations.getprocattr(p, name, value, size);
+}
+
+static int stacker_setprocattr(struct task_struct *p, char *name, void *value, size_t size)
+{
+
+ if (!selinux_module)
+ return -EINVAL;
+ if (!selinux_module->module_operations.setprocattr)
+ return -EINVAL;
+ return selinux_module->module_operations.setprocattr(p, name, value, size);
+}
+
+/*
+ * Add the stacked module (as specified by name and ops).
+ * If the module is not compiled in, the symbol_get at the end will
+ * prevent the the module from being unloaded.
+*/
+static int stacker_register (const char *name, struct security_operations *ops)
+{
+ char *new_module_name;
+ struct module_entry *new_module_entry;
+ int namelen = strnlen(name, MAX_MODULE_NAME_LEN);
+ int ret = 0;
+
+ spin_lock(&stacker_lock);
+
+ if (forbid_stacker_register) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ new_module_name = kmalloc(namelen+1, GFP_KERNEL);
+ new_module_entry = kmalloc(sizeof(struct module_entry), GFP_KERNEL);
+ if (!new_module_name || !new_module_entry) {
+ printk(KERN_WARNING
+ "%s: Failure registering module - out of memory\n",
+ __FUNCTION__);
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ memset(new_module_entry, 0, sizeof(struct module_entry));
+ strncpy(new_module_name, name, namelen);
+ new_module_name[namelen] = '\0';
+ memcpy(&new_module_entry->module_operations, ops,
+ sizeof(struct security_operations));
+
+ new_module_entry->module_name = new_module_name;
+ new_module_entry->namelen = namelen;
+
+ INIT_LIST_HEAD(&new_module_entry->lsm_list);
+ INIT_LIST_HEAD(&new_module_entry->all_lsms);
+ list_add_tail(&new_module_entry->all_lsms, &all_modules);
+ list_add_tail(&new_module_entry->lsm_list, &stacked_modules);
+ if (strcmp(name, "selinux") == 0)
+ selinux_module = new_module_entry;
+
+ printk(KERN_INFO "%s: registered %s module\n", __FUNCTION__,
+ new_module_entry->module_name);
+
+ symbol_get(ops);
+
+out:
+ spin_unlock(&stacker_lock);
+ return ret;
+}
+
+static struct module_entry *
+find_active_lsm(const char *name, int len)
+{
+ struct module_entry *m, *ret = NULL;
+
+ rcu_read_lock();
+ stack_for_each_entry(m, &stacked_modules, lsm_list) {
+ if (m->namelen == len && !strncmp(m->module_name, name, len)) {
+ ret = m;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+ return ret;
+}
+
+/*
+ * Currently this version of stacker does not allow for module
+ * unregistering.
+ * Easy way to allow for this is using rcu ref counting like an older
+ * version of stacker did.
+ * Another way would be to force stacker_unregister to sleep between
+ * removing the module from all_modules and free_modules and unloading it.
+ */
+static int stacker_unregister (const char *name, struct security_operations *ops)
+{
+ return -EPERM;
+}
+
+static struct security_operations stacker_ops = {
+ .ptrace = stacker_ptrace,
+ .capget = stacker_capget,
+ .capset_check = stacker_capset_check,
+ .capset_set = stacker_capset_set,
+ .acct = stacker_acct,
+ .sysctl = stacker_sysctl,
+ .capable = stacker_capable,
+ .quotactl = stacker_quotactl,
+ .quota_on = stacker_quota_on,
+ .syslog = stacker_syslog,
+ .settime = stacker_settime,
+ .vm_enough_memory = stacker_vm_enough_memory,
+
+ .bprm_alloc_security = stacker_bprm_alloc_security,
+ .bprm_free_security = stacker_bprm_free_security,
+ .bprm_apply_creds = stacker_bprm_apply_creds,
+ .bprm_post_apply_creds = stacker_bprm_post_apply_creds,
+ .bprm_set_security = stacker_bprm_set_security,
+ .bprm_check_security = stacker_bprm_check_security,
+ .bprm_secureexec = stacker_bprm_secureexec,
+
+ .sb_alloc_security = stacker_sb_alloc_security,
+ .sb_free_security = stacker_sb_free_security,
+ .sb_copy_data = stacker_sb_copy_data,
+ .sb_kern_mount = stacker_sb_kern_mount,
+ .sb_statfs = stacker_sb_statfs,
+ .sb_mount = stacker_mount,
+ .sb_check_sb = stacker_check_sb,
+ .sb_umount = stacker_umount,
+ .sb_umount_close = stacker_umount_close,
+ .sb_umount_busy = stacker_umount_busy,
+ .sb_post_remount = stacker_post_remount,
+ .sb_post_mountroot = stacker_post_mountroot,
+ .sb_post_addmount = stacker_post_addmount,
+ .sb_pivotroot = stacker_pivotroot,
+ .sb_post_pivotroot = stacker_post_pivotroot,
+
+ .inode_alloc_security = stacker_inode_alloc_security,
+ .inode_free_security = stacker_inode_free_security,
+ .inode_create = stacker_inode_create,
+ .inode_post_create = stacker_inode_post_create,
+ .inode_link = stacker_inode_link,
+ .inode_post_link = stacker_inode_post_link,
+ .inode_unlink = stacker_inode_unlink,
+ .inode_symlink = stacker_inode_symlink,
+ .inode_post_symlink = stacker_inode_post_symlink,
+ .inode_mkdir = stacker_inode_mkdir,
+ .inode_post_mkdir = stacker_inode_post_mkdir,
+ .inode_rmdir = stacker_inode_rmdir,
+ .inode_mknod = stacker_inode_mknod,
+ .inode_post_mknod = stacker_inode_post_mknod,
+ .inode_rename = stacker_inode_rename,
+ .inode_post_rename = stacker_inode_post_rename,
+ .inode_readlink = stacker_inode_readlink,
+ .inode_follow_link = stacker_inode_follow_link,
+ .inode_permission = stacker_inode_permission,
+
+ .inode_setattr = stacker_inode_setattr,
+ .inode_getattr = stacker_inode_getattr,
+ .inode_delete = stacker_inode_delete,
+ .inode_setxattr = stacker_inode_setxattr,
+ .inode_post_setxattr = stacker_inode_post_setxattr,
+ .inode_getxattr = stacker_inode_getxattr,
+ .inode_listxattr = stacker_inode_listxattr,
+ .inode_removexattr = stacker_inode_removexattr,
+ .inode_getsecurity = stacker_inode_getsecurity,
+ .inode_setsecurity = stacker_inode_setsecurity,
+ .inode_listsecurity = stacker_inode_listsecurity,
+
+ .file_permission = stacker_file_permission,
+ .file_alloc_security = stacker_file_alloc_security,
+ .file_free_security = stacker_file_free_security,
+ .file_ioctl = stacker_file_ioctl,
+ .file_mmap = stacker_file_mmap,
+ .file_mprotect = stacker_file_mprotect,
+ .file_lock = stacker_file_lock,
+ .file_fcntl = stacker_file_fcntl,
+ .file_set_fowner = stacker_file_set_fowner,
+ .file_send_sigiotask = stacker_file_send_sigiotask,
+ .file_receive = stacker_file_receive,
+
+ .task_create = stacker_task_create,
+ .task_alloc_security = stacker_task_alloc_security,
+ .task_free_security = stacker_task_free_security,
+ .task_setuid = stacker_task_setuid,
+ .task_post_setuid = stacker_task_post_setuid,
+ .task_setgid = stacker_task_setgid,
+ .task_setpgid = stacker_task_setpgid,
+ .task_getpgid = stacker_task_getpgid,
+ .task_getsid = stacker_task_getsid,
+ .task_setgroups = stacker_task_setgroups,
+ .task_setnice = stacker_task_setnice,
+ .task_setrlimit = stacker_task_setrlimit,
+ .task_setscheduler = stacker_task_setscheduler,
+ .task_getscheduler = stacker_task_getscheduler,
+ .task_kill = stacker_task_kill,
+ .task_wait = stacker_task_wait,
+ .task_prctl = stacker_task_prctl,
+ .task_reparent_to_init = stacker_task_reparent_to_init,
+ .task_to_inode = stacker_task_to_inode,
+
+ .ipc_permission = stacker_ipc_permission,
+
+ .msg_msg_alloc_security = stacker_msg_msg_alloc_security,
+ .msg_msg_free_security = stacker_msg_msg_free_security,
+ .msg_queue_alloc_security = stacker_msg_queue_alloc_security,
+ .msg_queue_free_security = stacker_msg_queue_free_security,
+ .msg_queue_associate = stacker_msg_queue_associate,
+ .msg_queue_msgctl = stacker_msg_queue_msgctl,
+ .msg_queue_msgsnd = stacker_msg_queue_msgsnd,
+ .msg_queue_msgrcv = stacker_msg_queue_msgrcv,
+ .shm_alloc_security = stacker_shm_alloc_security,
+ .shm_free_security = stacker_shm_free_security,
+ .shm_associate = stacker_shm_associate,
+ .shm_shmctl = stacker_shm_shmctl,
+ .shm_shmat = stacker_shm_shmat,
+
+ .sem_alloc_security = stacker_sem_alloc_security,
+ .sem_free_security = stacker_sem_free_security,
+ .sem_associate = stacker_sem_associate,
+ .sem_semctl = stacker_sem_semctl,
+ .sem_semop = stacker_sem_semop,
+
+ .netlink_send = stacker_netlink_send,
+ .netlink_recv = stacker_netlink_recv,
+
+ .register_security = stacker_register,
+ .unregister_security = stacker_unregister,
+
+ .d_instantiate = stacker_d_instantiate,
+ .getprocattr = stacker_getprocattr,
+ .setprocattr = stacker_setprocattr,
+
+#ifdef CONFIG_SECURITY_NETWORK
+ .unix_stream_connect = stacker_unix_stream_connect,
+ .unix_may_send = stacker_unix_may_send,
+ .socket_create = stacker_socket_create,
+ .socket_post_create = stacker_socket_post_create,
+ .socket_bind = stacker_socket_bind,
+ .socket_connect = stacker_socket_connect,
+ .socket_listen = stacker_socket_listen,
+ .socket_accept = stacker_socket_accept,
+ .socket_post_accept = stacker_socket_post_accept,
+ .socket_sendmsg = stacker_socket_sendmsg,
+ .socket_recvmsg = stacker_socket_recvmsg,
+ .socket_getsockname = stacker_socket_getsockname,
+ .socket_getpeername = stacker_socket_getpeername,
+ .socket_getsockopt = stacker_socket_getsockopt,
+ .socket_setsockopt = stacker_socket_setsockopt,
+ .socket_shutdown = stacker_socket_shutdown,
+ .socket_sock_rcv_skb = stacker_socket_sock_rcv_skb,
+ .socket_getpeersec = stacker_socket_getpeersec,
+ .sk_alloc_security = stacker_sk_alloc_security,
+ .sk_free_security = stacker_sk_free_security,
+#endif
+};
+
+
+/*
+ * Functions to provide the sysfs interface
+ */
+
+/* A structure to pass into sysfs through kobjects */
+struct stacker_kobj {
+ struct list_head slot_list;
+ struct kobject kobj;
+};
+
+struct stacker_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct stacker_kobj *, char *);
+ ssize_t (*store)(struct stacker_kobj *, const char *, size_t);
+};
+
+/* variables to hold kobject/sysfs data */
+static struct subsystem stacker_subsys;
+
+static void unregister_sysfs_files(void);
+
+static ssize_t stacker_attr_store(struct kobject *kobj,
+ struct attribute *attr, const char *buf, size_t len)
+{
+ struct stacker_kobj *obj = container_of(kobj,
+ struct stacker_kobj, kobj);
+ struct stacker_attribute *attribute = container_of(attr,
+ struct stacker_attribute, attr);
+
+ return attribute->store ? attribute->store(obj, buf, len) : 0;
+}
+
+static ssize_t stacker_attr_show(struct kobject *kobj,
+ struct attribute *attr, char *buf)
+{
+ struct stacker_kobj *obj = container_of(kobj,
+ struct stacker_kobj, kobj);
+ struct stacker_attribute *attribute = container_of(attr,
+ struct stacker_attribute, attr);
+
+ return attribute->show ? attribute->show(obj, buf) : 0;
+}
+
+static struct sysfs_ops stacker_sysfs_ops = {
+ .show = stacker_attr_show,
+ .store = stacker_attr_store,
+};
+
+static struct kobj_type stacker_ktype = {
+ .sysfs_ops = &stacker_sysfs_ops
+};
+
+static decl_subsys(stacker, &stacker_ktype, NULL);
+
+/* Set lockdown */
+static ssize_t lockdown_read (struct stacker_kobj *obj, char *buff)
+{
+ return sprintf(buff, "%d", forbid_stacker_register);
+}
+
+static ssize_t lockdown_write (struct stacker_kobj *obj, const char *buff, size_t count)
+{
+ if (count>0)
+ forbid_stacker_register = 1;
+
+ return count;
+}
+
+static struct stacker_attribute stacker_attr_lockdown = {
+ .attr = {.name = "lockdown", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+ .show = lockdown_read,
+ .store = lockdown_write
+};
+
+/* list modules */
+static ssize_t listmodules_read (struct stacker_kobj *obj, char *buff)
+{
+ ssize_t len = 0;
+ struct module_entry *m;
+
+ rcu_read_lock();
+ stack_for_each_entry(m, &stacked_modules, lsm_list) {
+ len += snprintf(buff+len, PAGE_SIZE - len, "%s\n",
+ m->module_name);
+ }
+ rcu_read_unlock();
+
+ return len;
+}
+
+static struct stacker_attribute stacker_attr_listmodules = {
+ .attr = {.name = "list_modules", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+ .show = listmodules_read,
+};
+
+/* respond to a request to unload a module */
+static ssize_t stacker_unload_write (struct stacker_kobj *obj, const char *name,
+ size_t count)
+{
+ struct module_entry *m;
+ int len = strnlen(name, MAX_MODULE_NAME_LEN);
+ int ret = count;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (count <= 0)
+ return -EINVAL;
+
+ spin_lock(&stacker_lock);
+ m = find_active_lsm(name, len);
+
+ if (!m) {
+ printk(KERN_INFO "%s: could not find module %s.\n",
+ __FUNCTION__, name);
+ ret = -ENOENT;
+ goto out;
+ }
+
+ if (strcmp(m->module_name, "selinux") == 0)
+ selinux_module = NULL;
+ list_del_rcu(&m->lsm_list);
+
+out:
+ spin_unlock(&stacker_lock);
+
+ return ret;
+}
+
+static struct stacker_attribute stacker_attr_unload = {
+ .attr = {.name = "unload", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+ .store = stacker_unload_write,
+};
+
+
+/* stop responding to sysfs */
+static ssize_t stop_responding_write (struct stacker_kobj *obj,
+ const char *buff, size_t count)
+{
+ if (count>0)
+ unregister_sysfs_files();
+ return count;
+}
+
+static struct stacker_attribute stacker_attr_stop_responding = {
+ .attr = {.name = "stop_responding", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+ .store = stop_responding_write
+};
+
+static void unregister_sysfs_files(void)
+{
+ struct kobject *kobj;
+
+ if (!sysfsfiles_registered)
+ return;
+
+ kobj = &stacker_subsys.kset.kobj;
+ sysfs_remove_file(kobj, &stacker_attr_lockdown.attr);
+ sysfs_remove_file(kobj, &stacker_attr_listmodules.attr);
+ sysfs_remove_file(kobj, &stacker_attr_stop_responding.attr);
+ sysfs_remove_file(kobj, &stacker_attr_unload.attr);
+
+ sysfsfiles_registered = 0;
+}
+
+static int register_sysfs_files(void)
+{
+ int result;
+
+ result = subsystem_register(&stacker_subsys);
+ if (result) {
+ printk(KERN_WARNING
+ "Error (%d) registering stacker sysfs subsystem\n",
+ result);
+ return result;
+ }
+
+ sysfs_create_file(&stacker_subsys.kset.kobj,
+ &stacker_attr_lockdown.attr);
+ sysfs_create_file(&stacker_subsys.kset.kobj,
+ &stacker_attr_listmodules.attr);
+ sysfs_create_file(&stacker_subsys.kset.kobj,
+ &stacker_attr_unload.attr);
+ sysfsfiles_registered = 1;
+ stacker_dbg("sysfs files registered\n");
+ return 0;
+}
+
+module_init(register_sysfs_files);
+
+static int __init stacker_init (void)
+{
+ forbid_stacker_register = 0;
+ INIT_LIST_HEAD(&stacked_modules);
+ INIT_LIST_HEAD(&all_modules);
+ sysfsfiles_registered = 0;
+ spin_lock_init(&stacker_lock);
+
+ if (register_security (&stacker_ops)) {
+ /*
+ * stacking stacker is just a stupid idea, so don't ask
+ * the current module to load us.
+ */
+ printk (KERN_WARNING "Failure registering stacker module "
+ "as primary security module.\n");
+ return -EINVAL;
+ }
+
+ printk(KERN_NOTICE "LSM stacker registered as the primary "
+ "security module\n");
+ return 0;
+}
+
+static void __exit stacker_exit (void)
+{
+ /*
+ * Since we have no return value, we can't just say no.
+ * Should probably force all child modules to exit somehow...
+ */
+
+ unregister_sysfs_files();
+ if (unregister_security (&stacker_ops))
+ printk(KERN_WARNING "Error unregistering LSM stacker.\n");
+ else
+ printk(KERN_WARNING "LSM stacker removed.\n");
+}
+
+security_initcall (stacker_init);
+module_exit (stacker_exit);
+
+MODULE_DESCRIPTION("LSM stacker - supports multiple simultaneous LSM modules");
+MODULE_AUTHOR("David A. Wheeler, Serge Hallyn");
+MODULE_LICENSE("GPL");
-
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