diff --git a/Documentation/x86/zero-page.txt b/Documentation/x86/zero-page.txt
index 95a4d34af3fdd7..b8527c6b76461c 100644
--- a/Documentation/x86/zero-page.txt
+++ b/Documentation/x86/zero-page.txt
@@ -31,6 +31,8 @@ Offset	Proto	Name		Meaning
 1E9/001	ALL	eddbuf_entries	Number of entries in eddbuf (below)
 1EA/001	ALL	edd_mbr_sig_buf_entries	Number of entries in edd_mbr_sig_buffer
 				(below)
+1EB/001	ALL     kbd_status      Numlock is enabled
+1EC/001	ALL     secure_boot	Secure boot is enabled in the firmware
 1EF/001	ALL	sentinel	Used to detect broken bootloaders
 290/040	ALL	edd_mbr_sig_buffer EDD MBR signatures
 2D0/A00	ALL	e820_map	E820 memory map table
diff --git a/Makefile b/Makefile
index 66da9a38b13b77..4d55d3834bf0d0 100644
--- a/Makefile
+++ b/Makefile
@@ -147,7 +147,8 @@ $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
 	@:
 
 sub-make:
-	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
+	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) \
+	KBUILD_SRC=$(shell realpath --relative-to=$(KBUILD_OUTPUT) $(CURDIR)) \
 	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
 
 # Leave processing to above invocation of make
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d9a94da0c29fd7..5b8b8c30670e31 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1776,6 +1776,17 @@ config EFI_MIXED
 
 	   If unsure, say N.
 
+config EFI_SECURE_BOOT_SIG_ENFORCE
+	def_bool n
+	depends on EFI
+	prompt "Force module signing when UEFI Secure Boot is enabled"
+	---help---
+	  UEFI Secure Boot provides a mechanism for ensuring that the
+	  firmware will only load signed bootloaders and kernels. Certain
+	  use cases may also require that all kernel modules also be signed.
+	  Say Y here to automatically enable module signature enforcement
+	  when a system boots with UEFI Secure Boot enabled.
+
 config SECCOMP
 	def_bool y
 	prompt "Enable seccomp to safely compute untrusted bytecode"
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 52fef606bc5425..faa223b000fa82 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -12,6 +12,7 @@
 #include <asm/efi.h>
 #include <asm/setup.h>
 #include <asm/desc.h>
+#include <asm/bootparam_utils.h>
 
 #include "../string.h"
 #include "eboot.h"
@@ -571,6 +572,36 @@ static void setup_efi_pci(struct boot_params *params)
 	efi_call_early(free_pool, pci_handle);
 }
 
+static int get_secure_boot(void)
+{
+	u8 sb, setup;
+	unsigned long datasize = sizeof(sb);
+	efi_guid_t var_guid = EFI_GLOBAL_VARIABLE_GUID;
+	efi_status_t status;
+
+	status = efi_early->call((unsigned long)sys_table->runtime->get_variable,
+				L"SecureBoot", &var_guid, NULL, &datasize, &sb);
+
+	if (status != EFI_SUCCESS)
+		return 0;
+
+	if (sb == 0)
+		return 0;
+
+
+	status = efi_early->call((unsigned long)sys_table->runtime->get_variable,
+				L"SetupMode", &var_guid, NULL, &datasize,
+				&setup);
+
+	if (status != EFI_SUCCESS)
+		return 0;
+
+	if (setup == 1)
+		return 0;
+
+	return 1;
+}
+
 static efi_status_t
 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
 {
@@ -1126,6 +1157,10 @@ struct boot_params *efi_main(struct efi_config *c,
 	else
 		setup_boot_services32(efi_early);
 
+	sanitize_boot_params(boot_params);
+
+	boot_params->secure_boot = get_secure_boot();
+
 	setup_graphics(boot_params);
 
 	setup_efi_pci(boot_params);
diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h
index c18ce67495fadf..2b3e5427097b4f 100644
--- a/arch/x86/include/uapi/asm/bootparam.h
+++ b/arch/x86/include/uapi/asm/bootparam.h
@@ -134,7 +134,8 @@ struct boot_params {
 	__u8  eddbuf_entries;				/* 0x1e9 */
 	__u8  edd_mbr_sig_buf_entries;			/* 0x1ea */
 	__u8  kbd_status;				/* 0x1eb */
-	__u8  _pad5[3];					/* 0x1ec */
+	__u8  secure_boot;				/* 0x1ec */
+	__u8  _pad5[2];					/* 0x1ed */
 	/*
 	 * The sentinel is set to a nonzero value (0xff) in header.S.
 	 *
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 589b3193f1020b..ab8372443efbf0 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -15,6 +15,7 @@
 #include <linux/thread_info.h>
 #include <linux/syscalls.h>
 #include <linux/bitmap.h>
+#include <linux/module.h>
 #include <asm/syscalls.h>
 
 /*
@@ -28,7 +29,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
 
 	if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
 		return -EINVAL;
-	if (turn_on && !capable(CAP_SYS_RAWIO))
+	if (turn_on && (!capable(CAP_SYS_RAWIO) || secure_modules()))
 		return -EPERM;
 
 	/*
@@ -108,7 +109,7 @@ SYSCALL_DEFINE1(iopl, unsigned int, level)
 		return -EINVAL;
 	/* Trying to gain more privileges? */
 	if (level > old) {
-		if (!capable(CAP_SYS_RAWIO))
+		if (!capable(CAP_SYS_RAWIO) || secure_modules())
 			return -EPERM;
 	}
 	regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) |
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 7f3550acde1b8c..963ba40119234a 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -83,6 +83,9 @@ static ssize_t msr_write(struct file *file, const char __user *buf,
 	int err = 0;
 	ssize_t bytes = 0;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (count % 8)
 		return -EINVAL;	/* Invalid chunk size */
 
@@ -130,6 +133,10 @@ static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg)
 			err = -EBADF;
 			break;
 		}
+		if (secure_modules()) {
+			err = -EPERM;
+			break;
+		}
 		if (copy_from_user(&regs, uregs, sizeof regs)) {
 			err = -EFAULT;
 			break;
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c4e7b3991b60d4..a666b6c29c777a 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -1152,6 +1152,14 @@ void __init setup_arch(char **cmdline_p)
 
 	io_delay_init();
 
+#ifdef CONFIG_EFI_SECURE_BOOT_SIG_ENFORCE
+	if (boot_params.secure_boot) {
+		set_bit(EFI_SECURE_BOOT, &efi.flags);
+		enforce_signed_modules();
+		pr_info("Secure boot enabled\n");
+	}
+#endif
+
 	/*
 	 * Parse the ACPI tables for possible boot-time SMP configuration.
 	 */
diff --git a/drivers/acpi/custom_method.c b/drivers/acpi/custom_method.c
index c68e72414a67a9..4277938af700d1 100644
--- a/drivers/acpi/custom_method.c
+++ b/drivers/acpi/custom_method.c
@@ -29,6 +29,9 @@ static ssize_t cm_write(struct file *file, const char __user * user_buf,
 	struct acpi_table_header table;
 	acpi_status status;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (!(*ppos)) {
 		/* parse the table header to get the table length */
 		if (count <= sizeof(struct acpi_table_header))
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index b108f1358a32b5..158de7d81bfd8a 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -40,6 +40,7 @@
 #include <linux/list.h>
 #include <linux/jiffies.h>
 #include <linux/semaphore.h>
+#include <linux/module.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -184,7 +185,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
 acpi_physical_address __init acpi_os_get_root_pointer(void)
 {
 #ifdef CONFIG_KEXEC
-	if (acpi_rsdp)
+	if (acpi_rsdp && !secure_modules())
 		return acpi_rsdp;
 #endif
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 71025c2f6bbb07..3264735e3596be 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -27,6 +27,7 @@
 #include <linux/export.h>
 #include <linux/io.h>
 #include <linux/uio.h>
+#include <linux/module.h>
 
 #include <linux/uaccess.h>
 
@@ -166,6 +167,9 @@ static ssize_t write_mem(struct file *file, const char __user *buf,
 	if (p != *ppos)
 		return -EFBIG;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (!valid_phys_addr_range(p, count))
 		return -EFAULT;
 
@@ -512,6 +516,9 @@ static ssize_t write_kmem(struct file *file, const char __user *buf,
 	char *kbuf; /* k-addr because vwrite() takes vmlist_lock rwlock */
 	int err = 0;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (p < (unsigned long) high_memory) {
 		unsigned long to_write = min_t(unsigned long, count,
 					       (unsigned long)high_memory - p);
@@ -577,6 +584,9 @@ static ssize_t write_port(struct file *file, const char __user *buf,
 	unsigned long i = *ppos;
 	const char __user *tmp = buf;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (!access_ok(VERIFY_READ, buf, count))
 		return -EFAULT;
 	while (count-- > 0 && i < 65536) {
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index d319a9ca9b7bf9..6b1884d1beb6e6 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -30,6 +30,7 @@
 #include <linux/vgaarb.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
+#include <linux/module.h>
 #include "pci.h"
 
 static int sysfs_initialized;	/* = 0 */
@@ -711,6 +712,9 @@ static ssize_t pci_write_config(struct file *filp, struct kobject *kobj,
 	loff_t init_off = off;
 	u8 *data = (u8 *) buf;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (off > dev->cfg_size)
 		return 0;
 	if (off + count > dev->cfg_size) {
@@ -1002,6 +1006,9 @@ static int pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 	resource_size_t start, end;
 	int i;
 
+	if (secure_modules())
+		return -EPERM;
+
 	for (i = 0; i < PCI_ROM_RESOURCE; i++)
 		if (res == &pdev->resource[i])
 			break;
@@ -1101,6 +1108,9 @@ static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj,
 				     struct bin_attribute *attr, char *buf,
 				     loff_t off, size_t count)
 {
+	if (secure_modules())
+		return -EPERM;
+
 	return pci_resource_io(filp, kobj, attr, buf, off, count, true);
 }
 
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 3f155e78513fd4..4265ea07e3b066 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -116,6 +116,9 @@ static ssize_t proc_bus_pci_write(struct file *file, const char __user *buf,
 	int size = dev->cfg_size;
 	int cnt;
 
+	if (secure_modules())
+		return -EPERM;
+
 	if (pos >= size)
 		return 0;
 	if (nbytes >= size)
@@ -195,6 +198,9 @@ static long proc_bus_pci_ioctl(struct file *file, unsigned int cmd,
 #endif /* HAVE_PCI_MMAP */
 	int ret = 0;
 
+	if (secure_modules())
+		return -EPERM;
+
 	switch (cmd) {
 	case PCIIOC_CONTROLLER:
 		ret = pci_domain_nr(dev->bus);
@@ -233,7 +239,7 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 	struct pci_filp_private *fpriv = file->private_data;
 	int i, ret;
 
-	if (!capable(CAP_SYS_RAWIO))
+	if (!capable(CAP_SYS_RAWIO) || secure_modules())
 		return -EPERM;
 
 	/* Make sure the caller is mapping a real resource for this device */
diff --git a/drivers/pci/syscall.c b/drivers/pci/syscall.c
index b91c4da6836574..98f5637304d1ba 100644
--- a/drivers/pci/syscall.c
+++ b/drivers/pci/syscall.c
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <linux/pci.h>
 #include <linux/syscalls.h>
+#include <linux/module.h>
 #include <asm/uaccess.h>
 #include "pci.h"
 
@@ -92,7 +93,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
 	u32 dword;
 	int err = 0;
 
-	if (!capable(CAP_SYS_ADMIN))
+	if (!capable(CAP_SYS_ADMIN) || secure_modules())
 		return -EPERM;
 
 	dev = pci_get_bus_and_slot(bus, dfn);
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index a26dca3640ea75..6ec9cabf5dfa75 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1872,6 +1872,9 @@ static int show_dsts(struct seq_file *m, void *data)
 	int err;
 	u32 retval = -1;
 
+	if (secure_modules())
+		return -EPERM;
+
 	err = asus_wmi_get_devstate(asus, asus->debug.dev_id, &retval);
 
 	if (err < 0)
@@ -1888,6 +1891,9 @@ static int show_devs(struct seq_file *m, void *data)
 	int err;
 	u32 retval = -1;
 
+	if (secure_modules())
+		return -EPERM;
+
 	err = asus_wmi_set_devstate(asus->debug.dev_id, asus->debug.ctrl_param,
 				    &retval);
 
@@ -1912,6 +1918,9 @@ static int show_call(struct seq_file *m, void *data)
 	union acpi_object *obj;
 	acpi_status status;
 
+	if (secure_modules())
+		return -EPERM;
+
 	status = wmi_evaluate_method(ASUS_WMI_MGMT_GUID,
 				     1, asus->debug.method_id,
 				     &input, &output);
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 80aa6f1eb33699..c7ba7b26588b0e 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -102,6 +102,14 @@ int ovl_copy_xattr(struct dentry *old, struct dentry *new)
 			value_size = size;
 			goto retry;
 		}
+		error = security_inode_copy_up_xattr(old, new,
+						     name, value, &size);
+		if (error < 0)
+			break;
+		if (error == 1) {
+			error = 0;
+			continue; /* Discard */
+		}
 
 		error = vfs_setxattr(new, name, value, size, 0);
 		if (error)
@@ -265,6 +273,10 @@ static int ovl_copy_up_locked(struct dentry *workdir, struct dentry *upperdir,
 	if (err)
 		goto out2;
 
+	err = security_inode_copy_up(lowerpath->dentry, newdentry);
+	if (err < 0)
+		goto out_cleanup;
+
 	if (S_ISREG(stat->mode)) {
 		struct path upperpath;
 
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index d1cdc60dd68fa2..a5b149833b444b 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -189,6 +189,9 @@ int ovl_permission(struct inode *inode, int mask)
 			goto out_dput;
 	}
 
+	if (!is_upper)
+		mask |= MAY_OPEN_LOWER;
+
 	err = __inode_permission(realinode, mask);
 out_dput:
 	dput(alias);
diff --git a/include/linux/efi.h b/include/linux/efi.h
index f196dd0b0f2f6c..3b3909fd6531da 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -1062,6 +1062,7 @@ extern int __init efi_setup_pcdp_console(char *);
 #define EFI_ARCH_1		7	/* First arch-specific bit */
 #define EFI_DBG			8	/* Print additional debug info at runtime */
 #define EFI_NX_PE_DATA		9	/* Can runtime data regions be mapped non-executable? */
+#define EFI_SECURE_BOOT		10	/* Are we in Secure Boot mode? */
 
 #ifdef CONFIG_EFI
 /*
diff --git a/include/linux/fs.h b/include/linux/fs.h
index dd288148a6b15f..59889963bbeb96 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -84,6 +84,7 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset,
 #define MAY_CHDIR		0x00000040
 /* called from RCU mode, don't block */
 #define MAY_NOT_BLOCK		0x00000080
+#define MAY_OPEN_LOWER		0x00000100
 
 /*
  * flags in file.f_mode.  Note that FMODE_READ and FMODE_WRITE must correspond
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 7ae397669d8b62..b585466f065ff3 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -401,6 +401,24 @@
  *	@inode contains a pointer to the inode.
  *	@secid contains a pointer to the location where result will be saved.
  *	In case of failure, @secid will be set to zero.
+ * @inode_copy_up:
+ *	Appropriately label the destination inode when a unioned file is copied
+ *	up from a lower layer to the union/overlay layer.
+ *	@src indicates the file that is being copied up.
+ *	@dst indicates the file that has being created by the copy up.
+ *	Returns 0 on success or a negative error code on error.
+ * @inode_copy_up_xattr:
+ *	Filter/modify the xattrs being copied up when a unioned file is copied
+ *	up from a lower layer to the union/overlay layer.
+ *	@src indicates the file that is being copied up.
+ *	@dst indicates the file that has being created by the copy up.
+ *	@name indicates the name of the xattr.
+ *	@value, *@size indicate the payload of the xattr.
+ *	Returns 0 to accept the xattr, 1 to discard the xattr or a negative
+ *	error code to abort the copy up.  The xattr buffer must be at least
+ *	XATTR_SIZE_MAX in capacity and the contents may be modified and *@size
+ *	changed appropriately.  Note that the caller is responsible for reading
+ *	and writing the xattrs as this hook is merely a filter.
  *
  * Security hooks for file operations
  *
@@ -1425,6 +1443,9 @@ union security_list_options {
 	int (*inode_listsecurity)(struct inode *inode, char *buffer,
 					size_t buffer_size);
 	void (*inode_getsecid)(struct inode *inode, u32 *secid);
+	int (*inode_copy_up) (struct dentry *src, struct dentry *dst);
+	int (*inode_copy_up_xattr) (struct dentry *src, struct dentry *dst,
+				    const char *name, void *value, size_t *size);
 
 	int (*file_permission)(struct file *file, int mask);
 	int (*file_alloc_security)(struct file *file);
@@ -1696,6 +1717,8 @@ struct security_hook_heads {
 	struct list_head inode_setsecurity;
 	struct list_head inode_listsecurity;
 	struct list_head inode_getsecid;
+	struct list_head inode_copy_up;
+	struct list_head inode_copy_up_xattr;
 	struct list_head file_permission;
 	struct list_head file_alloc_security;
 	struct list_head file_free_security;
diff --git a/include/linux/module.h b/include/linux/module.h
index 3daf2b3a09d29b..fe5c49d6b8573f 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -273,6 +273,12 @@ const struct exception_table_entry *search_exception_tables(unsigned long add);
 
 struct notifier_block;
 
+#ifdef CONFIG_MODULE_SIG
+extern void enforce_signed_modules(void);
+#else
+static inline void enforce_signed_modules(void) {};
+#endif
+
 #ifdef CONFIG_MODULES
 
 extern int modules_disabled; /* for sysctl */
@@ -643,6 +649,8 @@ static inline bool module_requested_async_probing(struct module *module)
 	return module && module->async_probe_requested;
 }
 
+extern bool secure_modules(void);
+
 #ifdef CONFIG_LIVEPATCH
 static inline bool is_livepatch_module(struct module *mod)
 {
@@ -771,6 +779,10 @@ static inline bool module_requested_async_probing(struct module *module)
 	return false;
 }
 
+static inline bool secure_modules(void)
+{
+	return false;
+}
 #endif /* CONFIG_MODULES */
 
 #ifdef CONFIG_SYSFS
diff --git a/include/linux/security.h b/include/linux/security.h
index 14df373ff2caf4..986265b2f5c94f 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -282,6 +282,10 @@ int security_inode_getsecurity(struct inode *inode, const char *name, void **buf
 int security_inode_setsecurity(struct inode *inode, const char *name, const void *value, size_t size, int flags);
 int security_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size);
 void security_inode_getsecid(struct inode *inode, u32 *secid);
+int security_inode_copy_up(struct dentry *src, struct dentry *dst);
+int security_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
+				 const char *name, void *value, size_t *size);
+
 int security_file_permission(struct file *file, int mask);
 int security_file_alloc(struct file *file);
 void security_file_free(struct file *file);
@@ -758,6 +762,16 @@ static inline void security_inode_getsecid(struct inode *inode, u32 *secid)
 	*secid = 0;
 }
 
+static inline int security_inode_copy_up(struct dentry *src, struct dentry *dst)
+{
+	return 0;
+}
+static inline int security_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
+					       const char *name, const void *value, size_t *size)
+{
+	return 0;
+}
+
 static inline int security_file_permission(struct file *file, int mask)
 {
 	return 0;
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 4384672d324516..08767837da781a 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -17,6 +17,7 @@
 #include <linux/syscalls.h>
 #include <linux/vmalloc.h>
 #include <linux/slab.h>
+#include <linux/module.h>
 
 #include "kexec_internal.h"
 
@@ -189,7 +190,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
 	int result;
 
 	/* We only trust the superuser with rebooting the system. */
-	if (!capable(CAP_SYS_BOOT) || kexec_load_disabled)
+	if (!capable(CAP_SYS_BOOT) || kexec_load_disabled || secure_modules())
 		return -EPERM;
 
 	/*
diff --git a/kernel/module.c b/kernel/module.c
index 5f71aa63ed2a55..ea484f3a35b2b8 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4199,3 +4199,20 @@ void module_layout(struct module *mod,
 }
 EXPORT_SYMBOL(module_layout);
 #endif
+
+#ifdef CONFIG_MODULE_SIG
+void enforce_signed_modules(void)
+{
+	sig_enforce = true;
+}
+#endif
+
+bool secure_modules(void)
+{
+#ifdef CONFIG_MODULE_SIG
+	return (sig_enforce || modules_disabled);
+#else
+	return modules_disabled;
+#endif
+}
+EXPORT_SYMBOL(secure_modules);
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index fca9254280ee4f..ffd8644078b2f1 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -29,6 +29,7 @@
 #include <linux/ctype.h>
 #include <linux/genhd.h>
 #include <linux/ktime.h>
+#include <linux/module.h>
 #include <trace/events/power.h>
 
 #include "power.h"
@@ -66,7 +67,7 @@ static const struct platform_hibernation_ops *hibernation_ops;
 
 bool hibernation_available(void)
 {
-	return (nohibernate == 0);
+	return ((nohibernate == 0) && !secure_modules());
 }
 
 /**
diff --git a/security/security.c b/security/security.c
index 709569305d329c..77ec85b4bebae2 100644
--- a/security/security.c
+++ b/security/security.c
@@ -727,6 +727,19 @@ void security_inode_getsecid(struct inode *inode, u32 *secid)
 	call_void_hook(inode_getsecid, inode, secid);
 }
 
+int security_inode_copy_up(struct dentry *src, struct dentry *dst)
+{
+	return call_int_hook(inode_copy_up, 0, src, dst);
+}
+EXPORT_SYMBOL(security_inode_copy_up);
+
+int security_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
+				 const char *name, void *value, size_t *size)
+{
+	return call_int_hook(inode_copy_up_xattr, 0, src, dst, name, value, size);
+}
+EXPORT_SYMBOL(security_inode_copy_up_xattr);
+
 int security_file_permission(struct file *file, int mask)
 {
 	int ret;
@@ -1663,6 +1676,10 @@ struct security_hook_heads security_hook_heads = {
 		LIST_HEAD_INIT(security_hook_heads.inode_listsecurity),
 	.inode_getsecid =
 		LIST_HEAD_INIT(security_hook_heads.inode_getsecid),
+	.inode_copy_up =
+		LIST_HEAD_INIT(security_hook_heads.inode_copy_up),
+	.inode_copy_up_xattr =
+		LIST_HEAD_INIT(security_hook_heads.inode_copy_up_xattr),
 	.file_permission =
 		LIST_HEAD_INIT(security_hook_heads.file_permission),
 	.file_alloc_security =
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a86d537eb79b14..10081f74460326 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1755,6 +1755,7 @@ static int file_has_perm(const struct cred *cred,
 			 struct file *file,
 			 u32 av)
 {
+	struct inode_security_struct *isec;
 	struct file_security_struct *fsec = file->f_security;
 	struct inode *inode = file_inode(file);
 	struct common_audit_data ad;
@@ -1775,8 +1776,15 @@ static int file_has_perm(const struct cred *cred,
 
 	/* av is zero if only checking access to the descriptor. */
 	rc = 0;
-	if (av)
-		rc = inode_has_perm(cred, inode, av, &ad);
+	if (av && likely(!IS_PRIVATE(inode))) {
+		if (fsec->union_isid) {
+			isec = inode->i_security;
+			rc = avc_has_perm(sid, fsec->union_isid, isec->sclass,
+					  av, &ad);
+		}
+		if (!rc)
+			rc = inode_has_perm(cred, inode, av, &ad);
+	}
 
 out:
 	return rc;
@@ -2973,6 +2981,15 @@ static int selinux_inode_permission(struct inode *inode, int mask)
 	u32 audited, denied;
 
 	from_access = mask & MAY_ACCESS;
+
+	/*
+	 * If we're trying to open the lower layer of an overlay mount, don't
+	 * worry about write or append permissions - these will be verified
+	 * against the upper context
+	 */
+	if (mask & MAY_OPEN_LOWER)
+		mask &= ~(MAY_WRITE|MAY_APPEND);
+
 	mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
 
 	/* No permission to check.  Existence test. */
@@ -3270,6 +3287,24 @@ static void selinux_inode_getsecid(struct inode *inode, u32 *secid)
 	*secid = isec->sid;
 }
 
+static int selinux_inode_copy_up(struct dentry *src, struct dentry *dst)
+{
+	return 0;
+}
+
+static int selinux_inode_copy_up_xattr(struct dentry *src, struct dentry *dst,
+				       const char *name, void *value,
+				       size_t *size)
+{
+	/* The copy_up hook above sets the initial context on an inode, but we
+	 * don't then want to overwrite it by blindly copying all the lower
+	 * xattrs up.  Instead, we have to filter out SELinux-related xattrs.
+	 */
+	if (strcmp(name, XATTR_NAME_SELINUX) == 0)
+		return 1; /* Discard */
+	return 0;
+}
+
 /* file security operations */
 
 static int selinux_revalidate_file_permission(struct file *file, int mask)
@@ -3585,10 +3620,72 @@ static int selinux_file_receive(struct file *file)
 	return file_has_perm(cred, file, file_to_av(file));
 }
 
+/*
+ * We have a file opened on a unioned file system that falls through to a file
+ * on a lower layer.  If there is a union inode, we try to get the label from
+ * that, otherwise we need to get it from the superblock.
+ *
+ * file->f_path points to the union layer and file->f_inode points to the lower
+ * layer.
+ */
+static int selinux_file_open_union(struct file *file,
+				   struct file_security_struct *fsec,
+				   const struct cred *cred)
+{
+	const struct superblock_security_struct *sbsec;
+	const struct inode_security_struct *isec, *dsec, *fisec;
+	const struct task_security_struct *tsec = current_security();
+	struct common_audit_data ad;
+	struct dentry *union_dentry = file->f_path.dentry;
+	const struct inode *union_inode = d_inode(union_dentry);
+	const struct inode *lower_inode = file_inode(file);
+	struct dentry *dir;
+	int rc;
+
+	sbsec = union_dentry->d_sb->s_security;
+
+	if (union_inode) {
+		isec = union_inode->i_security;
+		fsec->union_isid = isec->sid;
+	} else if ((sbsec->flags & SE_SBINITIALIZED) &&
+		   (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) {
+		fsec->union_isid = sbsec->mntpoint_sid;
+	} else {
+		dir = dget_parent(union_dentry);
+		dsec = d_inode(dir)->i_security;
+
+		rc = security_transition_sid(
+			tsec->sid, dsec->sid,
+			inode_mode_to_security_class(lower_inode->i_mode),
+			&union_dentry->d_name,
+			&fsec->union_isid);
+		dput(dir);
+		if (rc) {
+			pr_warn("%s:  security_transition_sid failed, rc=%d (name=%pD)\n",
+				__func__, -rc, file);
+			return rc;
+		}
+	}
+
+	/* We need to check that the union file is allowed to be opened as well
+	 * as checking that the lower file is allowed to be opened.
+	 */
+	if (unlikely(IS_PRIVATE(lower_inode)))
+		return 0;
+
+	ad.type = LSM_AUDIT_DATA_PATH;
+	ad.u.path = file->f_path;
+
+	fisec = lower_inode->i_security;
+	return avc_has_perm(cred_sid(cred), fsec->union_isid, fisec->sclass,
+			    open_file_to_av(file), &ad);
+}
+
 static int selinux_file_open(struct file *file, const struct cred *cred)
 {
 	struct file_security_struct *fsec;
 	struct inode_security_struct *isec;
+	int rc;
 
 	fsec = file->f_security;
 	isec = inode_security(file_inode(file));
@@ -3609,6 +3706,13 @@ static int selinux_file_open(struct file *file, const struct cred *cred)
 	 * new inode label or new policy.
 	 * This check is not redundant - do not remove.
 	 */
+
+	if (d_inode(file->f_path.dentry) != file->f_inode) {
+		rc = selinux_file_open_union(file, fsec, cred);
+		if (rc < 0)
+			return rc;
+	}
+
 	return file_path_has_perm(cred, file, open_file_to_av(file));
 }
 
@@ -6056,6 +6160,8 @@ static struct security_hook_list selinux_hooks[] = {
 	LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity),
 	LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity),
 	LSM_HOOK_INIT(inode_getsecid, selinux_inode_getsecid),
+	LSM_HOOK_INIT(inode_copy_up, selinux_inode_copy_up),
+	LSM_HOOK_INIT(inode_copy_up_xattr, selinux_inode_copy_up_xattr),
 
 	LSM_HOOK_INIT(file_permission, selinux_file_permission),
 	LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security),
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index c21e135460a5e9..1c23b90d21559f 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -59,6 +59,7 @@ struct file_security_struct {
 	u32 sid;		/* SID of open file description */
 	u32 fown_sid;		/* SID of file owner (for SIGIO) */
 	u32 isid;		/* SID of inode at the time of file open */
+	u32 union_isid;		/* SID of would-be inodes in union top (or 0) */
 	u32 pseqno;		/* Policy seqno at the time of file open */
 };