Merge branch 'for-next/gcc-plugin/randstruct' into for-next/kspp

64 files changed, 1290 insertions, 134 deletions

diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 77b92221f951..e10a484629e4 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -207,6 +207,8 @@ r200_reg_safe.h
 r300_reg_safe.h
 r420_reg_safe.h
 r600_reg_safe.h
+randomize_layout_hash.h
+randomize_layout_seed.h
 recordmcount
 relocs
 rlim_names.h
diff --git a/arch/Kconfig b/arch/Kconfig
index e0dced4da4bf..3eac97a4c7b3 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -443,6 +443,45 @@ config GCC_PLUGIN_STRUCTLEAK_VERBOSE
 	  initialized. Since not all existing initializers are detected
 	  by the plugin, this can produce false positive warnings.
 
+config GCC_PLUGIN_RANDSTRUCT
+	bool "Randomize layout of sensitive kernel structures"
+	depends on GCC_PLUGINS
+	select MODVERSIONS if MODULES
+	help
+	  If you say Y here, the layouts of structures explicitly
+	  marked by __randomize_layout will be randomized at
+	  compile-time.  This can introduce the requirement of an
+	  additional information exposure vulnerability for exploits
+	  targeting these structure types.
+
+	  Enabling this feature will introduce some performance impact,
+	  slightly increase memory usage, and prevent the use of forensic
+	  tools like Volatility against the system (unless the kernel
+	  source tree isn't cleaned after kernel installation).
+
+	  The seed used for compilation is located at
+	  scripts/gcc-plgins/randomize_layout_seed.h.  It remains after
+	  a make clean to allow for external modules to be compiled with
+	  the existing seed and will be removed by a make mrproper or
+	  make distclean.
+
+	  Note that the implementation requires gcc 4.7 or newer.
+
+	  This plugin was ported from grsecurity/PaX. More information at:
+	   * https://grsecurity.net/
+	   * https://pax.grsecurity.net/
+
+config GCC_PLUGIN_RANDSTRUCT_PERFORMANCE
+	bool "Use cacheline-aware structure randomization"
+	depends on GCC_PLUGIN_RANDSTRUCT
+	depends on !COMPILE_TEST
+	help
+	  If you say Y here, the RANDSTRUCT randomization will make a
+	  best effort at restricting randomization to cacheline-sized
+	  groups of elements.  It will further not randomize bitfields
+	  in structures.  This reduces the performance hit of RANDSTRUCT
+	  at the cost of weakened randomization.
+
 config HAVE_CC_STACKPROTECTOR
 	bool
 	help
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 68b06f9c65de..ad301f107dd2 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -87,6 +87,8 @@
 #define CALGN(code...)
 #endif
 
+#define IMM12_MASK 0xfff
+
 /*
  * Enable and disable interrupts
  */
diff --git a/arch/arm/include/asm/cacheflush.h b/arch/arm/include/asm/cacheflush.h
index d69bebf697e7..74504b154256 100644
--- a/arch/arm/include/asm/cacheflush.h
+++ b/arch/arm/include/asm/cacheflush.h
@@ -116,7 +116,7 @@ struct cpu_cache_fns {
 	void (*dma_unmap_area)(const void *, size_t, int);
 
 	void (*dma_flush_range)(const void *, const void *);
-};
+} __no_randomize_layout;
 
 /*
  * Select the calling method
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S
index 9f157e7c51e7..c731f0d2b2af 100644
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@@ -797,7 +797,10 @@ ENTRY(__switch_to)
 #if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
 	ldr	r7, [r2, #TI_TASK]
 	ldr	r8, =__stack_chk_guard
-	ldr	r7, [r7, #TSK_STACK_CANARY]
+	.if (TSK_STACK_CANARY > IMM12_MASK)
+	add	r7, r7, #TSK_STACK_CANARY & ~IMM12_MASK
+	.endif
+	ldr	r7, [r7, #TSK_STACK_CANARY & IMM12_MASK]
 #endif
 #ifdef CONFIG_CPU_USE_DOMAINS
 	mcr	p15, 0, r6, c3, c0, 0		@ Set domain register
diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
index 0d40c285bd86..f944836da8a2 100644
--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -25,11 +25,6 @@
 	ldr	\rd, [\rn, #VMA_VM_FLAGS]
 	.endm
 
-	.macro	tsk_mm, rd, rn
-	ldr	\rd, [\rn, #TI_TASK]
-	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
-	.endm
-
 /*
  * act_mm - get current->active_mm
  */
@@ -37,7 +32,10 @@
 	bic	\rd, sp, #8128
 	bic	\rd, \rd, #63
 	ldr	\rd, [\rd, #TI_TASK]
-	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
+	.if (TSK_ACTIVE_MM > IMM12_MASK)
+	add	\rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
+	.endif
+	ldr	\rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
 	.endm
 
 /*
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 7465d6fe336f..96c7e3cf43fa 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -83,7 +83,7 @@ struct pv_init_ops {
 	 */
 	unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
 			  unsigned long addr, unsigned len);
-};
+} __no_randomize_layout;
 
 
 struct pv_lazy_ops {
@@ -91,12 +91,12 @@ struct pv_lazy_ops {
 	void (*enter)(void);
 	void (*leave)(void);
 	void (*flush)(void);
-};
+} __no_randomize_layout;
 
 struct pv_time_ops {
 	unsigned long long (*sched_clock)(void);
 	unsigned long long (*steal_clock)(int cpu);
-};
+} __no_randomize_layout;
 
 struct pv_cpu_ops {
 	/* hooks for various privileged instructions */
@@ -175,7 +175,7 @@ struct pv_cpu_ops {
 
 	void (*start_context_switch)(struct task_struct *prev);
 	void (*end_context_switch)(struct task_struct *next);
-};
+} __no_randomize_layout;
 
 struct pv_irq_ops {
 	/*
@@ -198,7 +198,7 @@ struct pv_irq_ops {
 #ifdef CONFIG_X86_64
 	void (*adjust_exception_frame)(void);
 #endif
-};
+} __no_randomize_layout;
 
 struct pv_mmu_ops {
 	unsigned long (*read_cr2)(void);
@@ -306,7 +306,7 @@ struct pv_mmu_ops {
 	   an mfn.  We can tell which is which from the index. */
 	void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
 			   phys_addr_t phys, pgprot_t flags);
-};
+} __no_randomize_layout;
 
 struct arch_spinlock;
 #ifdef CONFIG_SMP
@@ -323,7 +323,7 @@ struct pv_lock_ops {
 	void (*kick)(int cpu);
 
 	struct paravirt_callee_save vcpu_is_preempted;
-};
+} __no_randomize_layout;
 
 /* This contains all the paravirt structures: we get a convenient
  * number for each function using the offset which we use to indicate
@@ -335,7 +335,7 @@ struct paravirt_patch_template {
 	struct pv_irq_ops pv_irq_ops;
 	struct pv_mmu_ops pv_mmu_ops;
 	struct pv_lock_ops pv_lock_ops;
-};
+} __no_randomize_layout;
 
 extern struct pv_info pv_info;
 extern struct pv_init_ops pv_init_ops;
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 3cada998a402..e2335edb9fc5 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -129,7 +129,7 @@ struct cpuinfo_x86 {
 	/* Index into per_cpu list: */
 	u16			cpu_index;
 	u32			microcode;
-};
+} __randomize_layout;
 
 struct cpuid_regs {
 	u32 eax, ebx, ecx, edx;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index a4831fe0223b..a2c59a08b2bd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -220,9 +220,9 @@ static void amdgpu_vram_mgr_debug(struct ttm_mem_type_manager *man,
 }
 
 const struct ttm_mem_type_manager_func amdgpu_vram_mgr_func = {
-	amdgpu_vram_mgr_init,
-	amdgpu_vram_mgr_fini,
-	amdgpu_vram_mgr_new,
-	amdgpu_vram_mgr_del,
-	amdgpu_vram_mgr_debug
+	.init		= amdgpu_vram_mgr_init,
+	.takedown	= amdgpu_vram_mgr_fini,
+	.get_node	= amdgpu_vram_mgr_new,
+	.put_node	= amdgpu_vram_mgr_del,
+	.debug		= amdgpu_vram_mgr_debug
 };
diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
index d5f53d04fa08..83e40fe51b62 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_thermal.c
@@ -709,17 +709,17 @@ static int tf_vega10_thermal_disable_alert(struct pp_hwmgr *hwmgr,
 
 static struct phm_master_table_item
 vega10_thermal_start_thermal_controller_master_list[] = {
-	{NULL, tf_vega10_thermal_initialize},
-	{NULL, tf_vega10_thermal_set_temperature_range},
-	{NULL, tf_vega10_thermal_enable_alert},
+	{ .tableFunction = tf_vega10_thermal_initialize },
+	{ .tableFunction = tf_vega10_thermal_set_temperature_range },
+	{ .tableFunction = tf_vega10_thermal_enable_alert },
 /* We should restrict performance levels to low before we halt the SMC.
  * On the other hand we are still in boot state when we do this
  * so it would be pointless.
  * If this assumption changes we have to revisit this table.
  */
-	{NULL, tf_vega10_thermal_setup_fan_table},
-	{NULL, tf_vega10_thermal_start_smc_fan_control},
-	{NULL, NULL}
+	{ .tableFunction = tf_vega10_thermal_setup_fan_table },
+	{ .tableFunction = tf_vega10_thermal_start_smc_fan_control },
+	{ }
 };
 
 static struct phm_master_table_header
@@ -731,10 +731,10 @@ vega10_thermal_start_thermal_controller_master = {
 
 static struct phm_master_table_item
 vega10_thermal_set_temperature_range_master_list[] = {
-	{NULL, tf_vega10_thermal_disable_alert},
-	{NULL, tf_vega10_thermal_set_temperature_range},
-	{NULL, tf_vega10_thermal_enable_alert},
-	{NULL, NULL}
+	{ .tableFunction = tf_vega10_thermal_disable_alert },
+	{ .tableFunction = tf_vega10_thermal_set_temperature_range },
+	{ .tableFunction = tf_vega10_thermal_enable_alert },
+	{ }
 };
 
 struct phm_master_table_header
diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_if.c
index 57a842ff3097..b7731b18ecae 100644
--- a/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_if.c
+++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_h264_if.c
@@ -493,10 +493,10 @@ static int vdec_h264_get_param(unsigned long h_vdec,
 }
 
 static struct vdec_common_if vdec_h264_if = {
-	vdec_h264_init,
-	vdec_h264_decode,
-	vdec_h264_get_param,
-	vdec_h264_deinit,
+	.init		= vdec_h264_init,
+	.decode		= vdec_h264_decode,
+	.get_param	= vdec_h264_get_param,
+	.deinit		= vdec_h264_deinit,
 };
 
 struct vdec_common_if *get_h264_dec_comm_if(void);
diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp8_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp8_if.c
index 6e7a62ae0842..b9fad6a48879 100644
--- a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp8_if.c
+++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp8_if.c
@@ -620,10 +620,10 @@ static void vdec_vp8_deinit(unsigned long h_vdec)
 }
 
 static struct vdec_common_if vdec_vp8_if = {
-	vdec_vp8_init,
-	vdec_vp8_decode,
-	vdec_vp8_get_param,
-	vdec_vp8_deinit,
+	.init		= vdec_vp8_init,
+	.decode		= vdec_vp8_decode,
+	.get_param	= vdec_vp8_get_param,
+	.deinit		= vdec_vp8_deinit,
 };
 
 struct vdec_common_if *get_vp8_dec_comm_if(void);
diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
index 5539b1853f16..1daee1207469 100644
--- a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
@@ -979,10 +979,10 @@ static int vdec_vp9_get_param(unsigned long h_vdec,
 }
 
 static struct vdec_common_if vdec_vp9_if = {
-	vdec_vp9_init,
-	vdec_vp9_decode,
-	vdec_vp9_get_param,
-	vdec_vp9_deinit,
+	.init		= vdec_vp9_init,
+	.decode		= vdec_vp9_decode,
+	.get_param	= vdec_vp9_get_param,
+	.deinit		= vdec_vp9_deinit,
 };
 
 struct vdec_common_if *get_vp9_dec_comm_if(void);
diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h
index c862cd4583cc..b8069eec18cb 100644
--- a/drivers/misc/sgi-xp/xp.h
+++ b/drivers/misc/sgi-xp/xp.h
@@ -309,6 +309,9 @@ static inline enum xp_retval
 xpc_send(short partid, int ch_number, u32 flags, void *payload,
 	 u16 payload_size)
 {
+	if (!xpc_interface.send)
+		return xpNotLoaded;
+
 	return xpc_interface.send(partid, ch_number, flags, payload,
 				  payload_size);
 }
@@ -317,6 +320,9 @@ static inline enum xp_retval
 xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
 		u16 payload_size, xpc_notify_func func, void *key)
 {
+	if (!xpc_interface.send_notify)
+		return xpNotLoaded;
+
 	return xpc_interface.send_notify(partid, ch_number, flags, payload,
 					 payload_size, func, key);
 }
@@ -324,12 +330,16 @@ xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
 static inline void
 xpc_received(short partid, int ch_number, void *payload)
 {
-	return xpc_interface.received(partid, ch_number, payload);
+	if (xpc_interface.received)
+		xpc_interface.received(partid, ch_number, payload);
 }
 
 static inline enum xp_retval
 xpc_partid_to_nasids(short partid, void *nasids)
 {
+	if (!xpc_interface.partid_to_nasids)
+		return xpNotLoaded;
+
 	return xpc_interface.partid_to_nasids(partid, nasids);
 }
 
diff --git a/drivers/misc/sgi-xp/xp_main.c b/drivers/misc/sgi-xp/xp_main.c
index 01be66d02ca8..6d7f557fd1c1 100644
--- a/drivers/misc/sgi-xp/xp_main.c
+++ b/drivers/misc/sgi-xp/xp_main.c
@@ -69,23 +69,9 @@ struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS];
 EXPORT_SYMBOL_GPL(xpc_registrations);
 
 /*
- * Initialize the XPC interface to indicate that XPC isn't loaded.
+ * Initialize the XPC interface to NULL to indicate that XPC isn't loaded.
  */
-static enum xp_retval
-xpc_notloaded(void)
-{
-	return xpNotLoaded;
-}
-
-struct xpc_interface xpc_interface = {
-	(void (*)(int))xpc_notloaded,
-	(void (*)(int))xpc_notloaded,
-	(enum xp_retval(*)(short, int, u32, void *, u16))xpc_notloaded,
-	(enum xp_retval(*)(short, int, u32, void *, u16, xpc_notify_func,
-			   void *))xpc_notloaded,
-	(void (*)(short, int, void *))xpc_notloaded,
-	(enum xp_retval(*)(short, void *))xpc_notloaded
-};
+struct xpc_interface xpc_interface = { };
 EXPORT_SYMBOL_GPL(xpc_interface);
 
 /*
@@ -115,17 +101,7 @@ EXPORT_SYMBOL_GPL(xpc_set_interface);
 void
 xpc_clear_interface(void)
 {
-	xpc_interface.connect = (void (*)(int))xpc_notloaded;
-	xpc_interface.disconnect = (void (*)(int))xpc_notloaded;
-	xpc_interface.send = (enum xp_retval(*)(short, int, u32, void *, u16))
-	    xpc_notloaded;
-	xpc_interface.send_notify = (enum xp_retval(*)(short, int, u32, void *,
-						       u16, xpc_notify_func,
-						       void *))xpc_notloaded;
-	xpc_interface.received = (void (*)(short, int, void *))
-	    xpc_notloaded;
-	xpc_interface.partid_to_nasids = (enum xp_retval(*)(short, void *))
-	    xpc_notloaded;
+	memset(&xpc_interface, 0, sizeof(xpc_interface));
 }
 EXPORT_SYMBOL_GPL(xpc_clear_interface);
 
@@ -188,7 +164,8 @@ xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
 
 	mutex_unlock(&registration->mutex);
 
-	xpc_interface.connect(ch_number);
+	if (xpc_interface.connect)
+		xpc_interface.connect(ch_number);
 
 	return xpSuccess;
 }
@@ -237,7 +214,8 @@ xpc_disconnect(int ch_number)
 	registration->assigned_limit = 0;
 	registration->idle_limit = 0;
 
-	xpc_interface.disconnect(ch_number);
+	if (xpc_interface.disconnect)
+		xpc_interface.disconnect(ch_number);
 
 	mutex_unlock(&registration->mutex);
 
diff --git a/fs/mount.h b/fs/mount.h
index bf1fda6eed8f..e406b286fba1 100644
--- a/fs/mount.h
+++ b/fs/mount.h
@@ -16,7 +16,7 @@ struct mnt_namespace {
 	u64 event;
 	unsigned int		mounts; /* # of mounts in the namespace */
 	unsigned int		pending_mounts;
-};
+} __randomize_layout;
 
 struct mnt_pcp {
 	int mnt_count;
@@ -68,7 +68,7 @@ struct mount {
 	struct hlist_head mnt_pins;
 	struct fs_pin mnt_umount;
 	struct dentry *mnt_ex_mountpoint;
-};
+} __randomize_layout;
 
 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
 
diff --git a/fs/namei.c b/fs/namei.c
index 6571a5f5112e..1764620ac383 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -524,7 +524,7 @@ struct nameidata {
 	struct inode	*link_inode;
 	unsigned	root_seq;
 	int		dfd;
-};
+} __randomize_layout;
 
 static void set_nameidata(struct nameidata *p, int dfd, struct filename *name)
 {
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 1a224a33a6c2..e5686be67be8 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -246,7 +246,7 @@ struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
 
 	devname = nfs_devname(dentry, page, PAGE_SIZE);
 	if (IS_ERR(devname))
-		mnt = (struct vfsmount *)devname;
+		mnt = ERR_CAST(devname);
 	else
 		mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), devname, &mountdata);
 
diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 358258364616..4690cd75d8d7 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -159,7 +159,7 @@ static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
 					PTR_ERR(dent_inode));
 		kfree(name);
 		/* Return the error code. */
-		return (struct dentry *)dent_inode;
+		return ERR_CAST(dent_inode);
 	}
 	/* It is guaranteed that @name is no longer allocated at this point. */
 	if (MREF_ERR(mref) == -ENOENT) {
diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 827fc9809bc2..9f88188060db 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -119,7 +119,7 @@ check_err:
 
 	if (IS_ERR(inode)) {
 		mlog_errno(PTR_ERR(inode));
-		result = (void *)inode;
+		result = ERR_CAST(inode);
 		goto bail;
 	}
 
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index c5ae09b6c726..07b16318223f 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -51,7 +51,7 @@ struct proc_dir_entry {
 	spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
 	u8 namelen;
 	char name[];
-};
+} __randomize_layout;
 
 union proc_op {
 	int (*proc_get_link)(struct dentry *, struct path *);
@@ -70,7 +70,7 @@ struct proc_inode {
 	struct list_head sysctl_inodes;
 	const struct proc_ns_operations *ns_ops;
 	struct inode vfs_inode;
-};
+} __randomize_layout;
 
 /*
  * General functions
@@ -279,7 +279,7 @@ struct proc_maps_private {
 #ifdef CONFIG_NUMA
 	struct mempolicy *task_mempolicy;
 #endif
-};
+} __randomize_layout;
 
 struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
 
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 05488da3aee9..3ae9013eeaaa 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -46,7 +46,7 @@ struct linux_binprm {
 	unsigned interp_flags;
 	unsigned interp_data;
 	unsigned long loader, exec;
-};
+} __randomize_layout;
 
 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
@@ -81,7 +81,7 @@ struct linux_binfmt {
 	int (*load_shlib)(struct file *);
 	int (*core_dump)(struct coredump_params *cprm);
 	unsigned long min_coredump;	/* minimal dump size */
-};
+} __randomize_layout;
 
 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
 
diff --git a/include/linux/cdev.h b/include/linux/cdev.h
index 408bc09ce497..cb28eb21e3ca 100644
--- a/include/linux/cdev.h
+++ b/include/linux/cdev.h
@@ -17,7 +17,7 @@ struct cdev {
 	struct list_head list;
 	dev_t dev;
 	unsigned int count;
-};
+} __randomize_layout;
 
 void cdev_init(struct cdev *, const struct file_operations *);
 
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 0efef9cf014f..c4a66c036692 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -223,9 +223,15 @@
 /* Mark a function definition as prohibited from being cloned. */
 #define __noclone	__attribute__((__noclone__, __optimize__("no-tracer")))
 
+#ifdef RANDSTRUCT_PLUGIN
+#define __randomize_layout __attribute__((randomize_layout))
+#define __no_randomize_layout __attribute__((no_randomize_layout))
+#endif
+
 #endif /* GCC_VERSION >= 40500 */
 
 #if GCC_VERSION >= 40600
+
 /*
  * When used with Link Time Optimization, gcc can optimize away C functions or
  * variables which are referenced only from assembly code.  __visible tells the
@@ -233,7 +239,17 @@
  * this.
  */
 #define __visible	__attribute__((externally_visible))
-#endif
+
+/*
+ * RANDSTRUCT_PLUGIN wants to use an anonymous struct, but it is only
+ * possible since GCC 4.6. To provide as much build testing coverage
+ * as possible, this is used for all GCC 4.6+ builds, and not just on
+ * RANDSTRUCT_PLUGIN builds.
+ */
+#define randomized_struct_fields_start	struct {
+#define randomized_struct_fields_end	} __randomize_layout;
+
+#endif /* GCC_VERSION >= 40600 */
 
 
 #if GCC_VERSION >= 40900 && !defined(__CHECKER__)
@@ -294,6 +310,14 @@
 #define __no_sanitize_address __attribute__((no_sanitize_address))
 #endif
 
+#if GCC_VERSION >= 50100
+/*
+ * Mark structures as requiring designated initializers.
+ * https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
+ */
+#define __designated_init __attribute__((designated_init))
+#endif
+
 #endif	/* gcc version >= 40000 specific checks */
 
 #if !defined(__noclone)
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index f8110051188f..0b4ac3e8c63e 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -440,10 +440,27 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
 # define __attribute_const__	/* unimplemented */
 #endif
 
+#ifndef __designated_init
+# define __designated_init
+#endif
+
 #ifndef __latent_entropy
 # define __latent_entropy
 #endif
 
+#ifndef __randomize_layout
+# define __randomize_layout __designated_init
+#endif
+
+#ifndef __no_randomize_layout
+# define __no_randomize_layout
+#endif
+
+#ifndef randomized_struct_fields_start
+# define randomized_struct_fields_start
+# define randomized_struct_fields_end
+#endif
+
 /*
  * Tell gcc if a function is cold. The compiler will assume any path
  * directly leading to the call is unlikely.
diff --git a/include/linux/cred.h b/include/linux/cred.h
index b03e7d049a64..82c8a9e1aabb 100644
--- a/include/linux/cred.h
+++ b/include/linux/cred.h
@@ -31,7 +31,7 @@ struct group_info {
 	atomic_t	usage;
 	int		ngroups;
 	kgid_t		gid[0];
-};
+} __randomize_layout;
 
 /**
  * get_group_info - Get a reference to a group info structure
@@ -145,7 +145,7 @@ struct cred {
 	struct user_namespace *user_ns; /* user_ns the caps and keyrings are relative to. */
 	struct group_info *group_info;	/* supplementary groups for euid/fsgid */
 	struct rcu_head	rcu;		/* RCU deletion hook */
-};
+} __randomize_layout;
 
 extern void __put_cred(struct cred *);
 extern void exit_creds(struct task_struct *);
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index d2e38dc6172c..7eb262e13d3c 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -113,7 +113,7 @@ struct dentry {
 		struct hlist_bl_node d_in_lookup_hash;	/* only for in-lookup ones */
 	 	struct rcu_head d_rcu;
 	} d_u;
-};
+} __randomize_layout;
 
 /*
  * dentry->d_lock spinlock nesting subclasses:
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 803e5a9b2654..8f28143486c4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -275,7 +275,7 @@ struct kiocb {
 	void (*ki_complete)(struct kiocb *iocb, long ret, long ret2);
 	void			*private;
 	int			ki_flags;
-};
+} __randomize_layout;
 
 static inline bool is_sync_kiocb(struct kiocb *kiocb)
 {
@@ -392,7 +392,7 @@ struct address_space {
 	gfp_t			gfp_mask;	/* implicit gfp mask for allocations */
 	struct list_head	private_list;	/* ditto */
 	void			*private_data;	/* ditto */
-} __attribute__((aligned(sizeof(long))));
+} __attribute__((aligned(sizeof(long)))) __randomize_layout;
 	/*
 	 * On most architectures that alignment is already the case; but
 	 * must be enforced here for CRIS, to let the least significant bit
@@ -435,7 +435,7 @@ struct block_device {
 	int			bd_fsfreeze_count;
 	/* Mutex for freeze */
 	struct mutex		bd_fsfreeze_mutex;
-};
+} __randomize_layout;
 
 /*
  * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
@@ -653,7 +653,7 @@ struct inode {
 #endif
 
 	void			*i_private; /* fs or device private pointer */
-};
+} __randomize_layout;
 
 static inline unsigned int i_blocksize(const struct inode *node)
 {
@@ -868,7 +868,8 @@ struct file {
 	struct list_head	f_tfile_llink;
 #endif /* #ifdef CONFIG_EPOLL */
 	struct address_space	*f_mapping;
-} __attribute__((aligned(4)));	/* lest something weird decides that 2 is OK */
+} __randomize_layout
+  __attribute__((aligned(4)));	/* lest something weird decides that 2 is OK */
 
 struct file_handle {
 	__u32 handle_bytes;
@@ -1005,7 +1006,7 @@ struct file_lock {
 			int state;		/* state of grant or error if -ve */
 		} afs;
 	} fl_u;
-};
+} __randomize_layout;
 
 struct file_lock_context {
 	spinlock_t		flc_lock;
@@ -1404,7 +1405,7 @@ struct super_block {
 
 	spinlock_t		s_inode_wblist_lock;
 	struct list_head	s_inodes_wb;	/* writeback inodes */
-};
+} __randomize_layout;
 
 /* Helper functions so that in most cases filesystems will
  * not need to deal directly with kuid_t and kgid_t and can
@@ -1690,7 +1691,7 @@ struct file_operations {
 			u64);
 	ssize_t (*dedupe_file_range)(struct file *, u64, u64, struct file *,
 			u64);
-};
+} __randomize_layout;
 
 struct inode_operations {
 	struct dentry * (*lookup) (struct inode *,struct dentry *, unsigned int);
diff --git a/include/linux/fs_struct.h b/include/linux/fs_struct.h
index 0efc3e62843a..7a026240cbb1 100644
--- a/include/linux/fs_struct.h
+++ b/include/linux/fs_struct.h
@@ -12,7 +12,7 @@ struct fs_struct {
 	int umask;
 	int in_exec;
 	struct path root, pwd;
-};
+} __randomize_layout;
 
 extern struct kmem_cache *fs_cachep;
 
diff --git a/include/linux/ipc.h b/include/linux/ipc.h
index 71fd92d81b26..ea0eb0b5f98c 100644
--- a/include/linux/ipc.h
+++ b/include/linux/ipc.h
@@ -20,6 +20,6 @@ struct kern_ipc_perm {
 	umode_t		mode;
 	unsigned long	seq;
 	void		*security;
-} ____cacheline_aligned_in_smp;
+} ____cacheline_aligned_in_smp __randomize_layout;
 
 #endif /* _LINUX_IPC_H */
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index 848e5796400e..65327ee0936b 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -61,7 +61,7 @@ struct ipc_namespace {
 	struct ucounts *ucounts;
 
 	struct ns_common ns;
-};
+} __randomize_layout;
 
 extern struct ipc_namespace init_ipc_ns;
 extern spinlock_t mq_lock;
diff --git a/include/linux/key-type.h b/include/linux/key-type.h
index 8496cf64575c..9520fc3c3b9a 100644
--- a/include/linux/key-type.h
+++ b/include/linux/key-type.h
@@ -45,7 +45,7 @@ struct key_preparsed_payload {
 	size_t		datalen;	/* Raw datalen */
 	size_t		quotalen;	/* Quota length for proposed payload */
 	time_t		expiry;		/* Expiry time of key */
-};
+} __randomize_layout;
 
 typedef int (*request_key_actor_t)(struct key_construction *key,
 				   const char *op, void *aux);
@@ -158,7 +158,7 @@ struct key_type {
 	/* internal fields */
 	struct list_head	link;		/* link in types list */
 	struct lock_class_key	lock_class;	/* key->sem lock class */
-};
+} __randomize_layout;
 
 extern struct key_type key_type_keyring;
 
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index c4e441e00db5..655082c88fd9 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -64,7 +64,7 @@ struct subprocess_info {
 	int (*init)(struct subprocess_info *info, struct cred *new);
 	void (*cleanup)(struct subprocess_info *info);
 	void *data;
-};
+} __randomize_layout;
 
 extern int
 call_usermodehelper(const char *path, char **argv, char **envp, int wait);
diff --git a/include/linux/kobject.h b/include/linux/kobject.h
index ca85cb80e99a..084513350317 100644
--- a/include/linux/kobject.h
+++ b/include/linux/kobject.h
@@ -172,7 +172,7 @@ struct kset {
 	spinlock_t list_lock;
 	struct kobject kobj;
 	const struct kset_uevent_ops *uevent_ops;
-};
+} __randomize_layout;
 
 extern void kset_init(struct kset *kset);
 extern int __must_check kset_register(struct kset *kset);
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 080f34e66017..565163fc9ad4 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1876,7 +1876,7 @@ struct security_hook_heads {
 	struct list_head audit_rule_match;
 	struct list_head audit_rule_free;
 #endif /* CONFIG_AUDIT */
-};
+} __randomize_layout;
 
 /*
  * Security module hook list structure.
@@ -1887,7 +1887,7 @@ struct security_hook_list {
 	struct list_head		*head;
 	union security_list_options	hook;
 	char				*lsm;
-};
+} __randomize_layout;
 
 /*
  * Initializing a security_hook_list structure takes
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 45cdb27791a3..ff151814a02d 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -342,7 +342,7 @@ struct vm_area_struct {
 	struct mempolicy *vm_policy;	/* NUMA policy for the VMA */
 #endif
 	struct vm_userfaultfd_ctx vm_userfaultfd_ctx;
-};
+} __randomize_layout;
 
 struct core_thread {
 	struct task_struct *task;
@@ -500,7 +500,7 @@ struct mm_struct {
 	atomic_long_t hugetlb_usage;
 #endif
 	struct work_struct async_put_work;
-};
+} __randomize_layout;
 
 extern struct mm_struct init_mm;
 
diff --git a/include/linux/module.h b/include/linux/module.h
index 21f56393602f..d93111d7def6 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -45,7 +45,7 @@ struct module_kobject {
 	struct kobject *drivers_dir;
 	struct module_param_attrs *mp;
 	struct completion *kobj_completion;
-};
+} __randomize_layout;
 
 struct module_attribute {
 	struct attribute attr;
@@ -475,7 +475,7 @@ struct module {
 	ctor_fn_t *ctors;
 	unsigned int num_ctors;
 #endif
-} ____cacheline_aligned;
+} ____cacheline_aligned __randomize_layout;
 #ifndef MODULE_ARCH_INIT
 #define MODULE_ARCH_INIT {}
 #endif
diff --git a/include/linux/mount.h b/include/linux/mount.h
index 8e0352af06b7..1ce85e6fd95f 100644
--- a/include/linux/mount.h
+++ b/include/linux/mount.h
@@ -67,7 +67,7 @@ struct vfsmount {
 	struct dentry *mnt_root;	/* root of the mounted tree */
 	struct super_block *mnt_sb;	/* pointer to superblock */
 	int mnt_flags;
-};
+} __randomize_layout;
 
 struct file; /* forward dec */
 struct path;
diff --git a/include/linux/msg.h b/include/linux/msg.h
index f3f302f9c197..a001305f5a79 100644
--- a/include/linux/msg.h
+++ b/include/linux/msg.h
@@ -29,7 +29,7 @@ struct msg_queue {
 	struct list_head q_messages;
 	struct list_head q_receivers;
 	struct list_head q_senders;
-};
+} __randomize_layout;
 
 /* Helper routines for sys_msgsnd and sys_msgrcv */
 extern long do_msgsnd(int msqid, long mtype, void __user *mtext,
diff --git a/include/linux/path.h b/include/linux/path.h
index d1372186f431..cde895cc4af4 100644
--- a/include/linux/path.h
+++ b/include/linux/path.h
@@ -7,7 +7,7 @@ struct vfsmount;
 struct path {
 	struct vfsmount *mnt;
 	struct dentry *dentry;
-};
+} __randomize_layout;
 
 extern void path_get(const struct path *);
 extern void path_put(const struct path *);
diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index c2a989dee876..b09136f88cf4 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -52,7 +52,7 @@ struct pid_namespace {
 	int hide_pid;
 	int reboot;	/* group exit code if this pidns was rebooted */
 	struct ns_common ns;
-};
+} __randomize_layout;
 
 extern struct pid_namespace init_pid_ns;
 
diff --git a/include/linux/proc_ns.h b/include/linux/proc_ns.h
index 58ab28d81fc2..06844b54dfc1 100644
--- a/include/linux/proc_ns.h
+++ b/include/linux/proc_ns.h
@@ -21,7 +21,7 @@ struct proc_ns_operations {
 	int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
 	struct user_namespace *(*owner)(struct ns_common *ns);
 	struct ns_common *(*get_parent)(struct ns_common *ns);
-};
+} __randomize_layout;
 
 extern const struct proc_ns_operations netns_operations;
 extern const struct proc_ns_operations utsns_operations;
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2b69fc650201..e2ad3531e7fe 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -408,7 +408,7 @@ struct sched_rt_entity {
 	/* rq "owned" by this entity/group: */
 	struct rt_rq			*my_q;
 #endif
-};
+} __randomize_layout;
 
 struct sched_dl_entity {
 	struct rb_node			rb_node;
@@ -490,6 +490,13 @@ struct task_struct {
 #endif
 	/* -1 unrunnable, 0 runnable, >0 stopped: */
 	volatile long			state;
+
+	/*
+	 * This begins the randomizable portion of task_struct. Only
+	 * scheduling-critical items should be added above here.
+	 */
+	randomized_struct_fields_start
+
 	void				*stack;
 	atomic_t			usage;
 	/* Per task flags (PF_*), defined further below: */
@@ -1051,6 +1058,13 @@ struct task_struct {
 	/* Used by LSM modules for access restriction: */
 	void				*security;
 #endif
+
+	/*
+	 * New fields for task_struct should be added above here, so that
+	 * they are included in the randomized portion of task_struct.
+	 */
+	randomized_struct_fields_end
+
 	/* CPU-specific state of this task: */
 	struct thread_struct		thread;
 
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index c06d63b3a583..2a0dd40b15db 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -222,7 +222,7 @@ struct signal_struct {
 	struct mutex cred_guard_mutex;	/* guard against foreign influences on
 					 * credential calculations
 					 * (notably. ptrace) */
-};
+} __randomize_layout;
 
 /*
  * Bits in flags field of signal_struct.
diff --git a/include/linux/sem.h b/include/linux/sem.h
index 9edec926e9d9..23bcbdfad4a6 100644
--- a/include/linux/sem.h
+++ b/include/linux/sem.h
@@ -21,7 +21,7 @@ struct sem_array {
 	int			sem_nsems;	/* no. of semaphores in array */
 	int			complex_count;	/* pending complex operations */
 	unsigned int		use_global_lock;/* >0: global lock required */
-};
+} __randomize_layout;
 
 #ifdef CONFIG_SYSVIPC
 
diff --git a/include/linux/shm.h b/include/linux/shm.h
index 04e881829625..0fb7061ec54c 100644
--- a/include/linux/shm.h
+++ b/include/linux/shm.h
@@ -22,7 +22,7 @@ struct shmid_kernel /* private to the kernel */
 	/* The task created the shm object.  NULL if the task is dead. */
 	struct task_struct	*shm_creator;
 	struct list_head	shm_clist;	/* list by creator */
-};
+} __randomize_layout;
 
 /* shm_mode upper byte flags */
 #define	SHM_DEST	01000	/* segment will be destroyed on last detach */
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 80d07816def0..9ddeef2c03e2 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -117,7 +117,7 @@ struct ctl_table
 	struct ctl_table_poll *poll;
 	void *extra1;
 	void *extra2;
-};
+} __randomize_layout;
 
 struct ctl_node {
 	struct rb_node node;
diff --git a/include/linux/tty.h b/include/linux/tty.h
index d07cd2105a6c..73f8d0977bb0 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -333,7 +333,7 @@ struct tty_struct {
 	/* If the tty has a pending do_SAK, queue it here - akpm */
 	struct work_struct SAK_work;
 	struct tty_port *port;
-};
+} __randomize_layout;
 
 /* Each of a tty's open files has private_data pointing to tty_file_private */
 struct tty_file_private {
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index b742b5e47cc2..00b2213f6a35 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -291,7 +291,7 @@ struct tty_operations {
 	void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
 #endif
 	const struct file_operations *proc_fops;
-};
+} __randomize_layout;
 
 struct tty_driver {
 	int	magic;		/* magic number for this structure */
@@ -325,7 +325,7 @@ struct tty_driver {
 
 	const struct tty_operations *ops;
 	struct list_head tty_drivers;
-};
+} __randomize_layout;
 
 extern struct list_head tty_drivers;
 
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h
index 32354b4b4b2b..b3575ce29148 100644
--- a/include/linux/user_namespace.h
+++ b/include/linux/user_namespace.h
@@ -66,7 +66,7 @@ struct user_namespace {
 #endif
 	struct ucounts		*ucounts;
 	int ucount_max[UCOUNT_COUNTS];
-};
+} __randomize_layout;
 
 struct ucounts {
 	struct hlist_node node;
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 60f0bb83b313..da826ed059cf 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -26,7 +26,7 @@ struct uts_namespace {
 	struct user_namespace *user_ns;
 	struct ucounts *ucounts;
 	struct ns_common ns;
-};
+} __randomize_layout;
 extern struct uts_namespace init_uts_ns;
 
 #ifdef CONFIG_UTS_NS
diff --git a/include/linux/vermagic.h b/include/linux/vermagic.h
index 6f8fbcf10dfb..af6c03f7f986 100644
--- a/include/linux/vermagic.h
+++ b/include/linux/vermagic.h
@@ -24,10 +24,17 @@
 #ifndef MODULE_ARCH_VERMAGIC
 #define MODULE_ARCH_VERMAGIC ""
 #endif
+#ifdef RANDSTRUCT_PLUGIN
+#include <generated/randomize_layout_hash.h>
+#define MODULE_RANDSTRUCT_PLUGIN "RANDSTRUCT_PLUGIN_" RANDSTRUCT_HASHED_SEED
+#else
+#define MODULE_RANDSTRUCT_PLUGIN
+#endif
 
 #define VERMAGIC_STRING 						\
 	UTS_RELEASE " "							\
 	MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT 			\
 	MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS	\
-	MODULE_ARCH_VERMAGIC
+	MODULE_ARCH_VERMAGIC						\
+	MODULE_RANDSTRUCT_PLUGIN
 
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index fd60eccb59a6..64e2a1e24a2c 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -36,7 +36,7 @@ struct unix_skb_parms {
 	u32			secid;		/* Security ID		*/
 #endif
 	u32			consumed;
-};
+} __randomize_layout;
 
 #define UNIXCB(skb) 	(*(struct unix_skb_parms *)&((skb)->cb))
 
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index e4dd3a214034..a62959d2b3f7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -155,7 +155,7 @@ struct neighbour {
 	struct rcu_head		rcu;
 	struct net_device	*dev;
 	u8			primary_key[0];
-};
+} __randomize_layout;
 
 struct neigh_ops {
 	int			family;
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index fe80bb48ab1f..a224196d16ac 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -147,7 +147,7 @@ struct net {
 #endif
 	struct sock		*diag_nlsk;
 	atomic_t		fnhe_genid;
-};
+} __randomize_layout;
 
 #include <linux/seq_file_net.h>
 
diff --git a/include/net/sock.h b/include/net/sock.h
index f33e3d134e0b..d349297db9e9 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1113,7 +1113,7 @@ struct proto {
 	atomic_t		socks;
 #endif
 	int			(*diag_destroy)(struct sock *sk, int err);
-};
+} __randomize_layout;
 
 int proto_register(struct proto *prot, int alloc_slab);
 void proto_unregister(struct proto *prot);
diff --git a/kernel/futex.c b/kernel/futex.c
index 357348a6cf6b..5616511abf39 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -212,7 +212,7 @@ struct futex_pi_state {
 	atomic_t refcount;
 
 	union futex_key key;
-};
+} __randomize_layout;
 
 /**
  * struct futex_q - The hashed futex queue entry, one per waiting task
@@ -246,7 +246,7 @@ struct futex_q {
 	struct rt_mutex_waiter *rt_waiter;
 	union futex_key *requeue_pi_key;
 	u32 bitset;
-};
+} __randomize_layout;
 
 static const struct futex_q futex_q_init = {
 	/* list gets initialized in queue_me()*/
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index 82335533620e..2e0e2eaa397f 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -29,6 +29,10 @@ ifdef CONFIG_GCC_PLUGINS
   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK_VERBOSE)	+= -fplugin-arg-structleak_plugin-verbose
   gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_STRUCTLEAK)	+= -DSTRUCTLEAK_PLUGIN
 
+  gcc-plugin-$(CONFIG_GCC_PLUGIN_RANDSTRUCT)	+= randomize_layout_plugin.so
+  gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT)	+= -DRANDSTRUCT_PLUGIN
+  gcc-plugin-cflags-$(CONFIG_GCC_PLUGIN_RANDSTRUCT_PERFORMANCE)	+= -fplugin-arg-randomize_layout_plugin-performance-mode
+
   GCC_PLUGINS_CFLAGS := $(strip $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y)) $(gcc-plugin-cflags-y))
 
   export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN GCC_PLUGIN_SUBDIR
diff --git a/scripts/gcc-plugins/.gitignore b/scripts/gcc-plugins/.gitignore
new file mode 100644
index 000000000000..de92ed9e3d83
--- /dev/null
+++ b/scripts/gcc-plugins/.gitignore
@@ -0,0 +1 @@
+randomize_layout_seed.h
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index 8b29dc17c73c..214eb2335c31 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -18,6 +18,14 @@ endif
 
 export HOSTLIBS
 
+$(obj)/randomize_layout_plugin.o: $(objtree)/$(obj)/randomize_layout_seed.h
+quiet_cmd_create_randomize_layout_seed = GENSEED $@
+cmd_create_randomize_layout_seed = \
+  $(CONFIG_SHELL) $(srctree)/$(src)/gen-random-seed.sh $@ $(objtree)/include/generated/randomize_layout_hash.h
+$(objtree)/$(obj)/randomize_layout_seed.h: FORCE
+	$(call if_changed,create_randomize_layout_seed)
+targets = randomize_layout_seed.h randomize_layout_hash.h
+
 $(HOSTLIBS)-y := $(foreach p,$(GCC_PLUGIN),$(if $(findstring /,$(p)),,$(p)))
 always := $($(HOSTLIBS)-y)
 
diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h
index b232ab15624c..6948898b3cdf 100644
--- a/scripts/gcc-plugins/gcc-common.h
+++ b/scripts/gcc-plugins/gcc-common.h
@@ -63,6 +63,13 @@
 #endif
 
 #if BUILDING_GCC_VERSION >= 4006
+/*
+ * The c-family headers were moved into a subdirectory in GCC version
+ * 4.7, but most plugin-building users of GCC 4.6 are using the Debian
+ * or Ubuntu package, which has an out-of-tree patch to move this to the
+ * same location as found in 4.7 and later:
+ * https://sources.debian.net/src/gcc-4.6/4.6.3-14/debian/patches/pr45078.diff/
+ */
 #include "c-family/c-common.h"
 #else
 #include "c-common.h"
@@ -946,4 +953,9 @@ static inline void debug_gimple_stmt(const_gimple s)
 	get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, preversep, pvolatilep)
 #endif
 
+#if BUILDING_GCC_VERSION < 7000
+#define SET_DECL_ALIGN(decl, align)	DECL_ALIGN(decl) = (align)
+#define SET_DECL_MODE(decl, mode)	DECL_MODE(decl) = (mode)
+#endif
+
 #endif
diff --git a/scripts/gcc-plugins/gen-random-seed.sh b/scripts/gcc-plugins/gen-random-seed.sh
new file mode 100644
index 000000000000..7514850f4815
--- /dev/null
+++ b/scripts/gcc-plugins/gen-random-seed.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+if [ ! -f "$1" ]; then
+	SEED=`od -A n -t x8 -N 32 /dev/urandom | tr -d ' \n'`
+	echo "const char *randstruct_seed = \"$SEED\";" > "$1"
+	HASH=`echo -n "$SEED" | sha256sum | cut -d" " -f1 | tr -d ' \n'`
+	echo "#define RANDSTRUCT_HASHED_SEED \"$HASH\"" > "$2"
+fi
diff --git a/scripts/gcc-plugins/randomize_layout_plugin.c b/scripts/gcc-plugins/randomize_layout_plugin.c
new file mode 100644
index 000000000000..cdaac8c66734
--- /dev/null
+++ b/scripts/gcc-plugins/randomize_layout_plugin.c
@@ -0,0 +1,1028 @@
+/*
+ * Copyright 2014-2016 by Open Source Security, Inc., Brad Spengler <spender@grsecurity.net>
+ *                   and PaX Team <pageexec@freemail.hu>
+ * Licensed under the GPL v2
+ *
+ * Note: the choice of the license means that the compilation process is
+ *       NOT 'eligible' as defined by gcc's library exception to the GPL v3,
+ *       but for the kernel it doesn't matter since it doesn't link against
+ *       any of the gcc libraries
+ *
+ * Usage:
+ * $ # for 4.5/4.6/C based 4.7
+ * $ gcc -I`gcc -print-file-name=plugin`/include -I`gcc -print-file-name=plugin`/include/c-family -fPIC -shared -O2 -o randomize_layout_plugin.so randomize_layout_plugin.c
+ * $ # for C++ based 4.7/4.8+
+ * $ g++ -I`g++ -print-file-name=plugin`/include -I`g++ -print-file-name=plugin`/include/c-family -fPIC -shared -O2 -o randomize_layout_plugin.so randomize_layout_plugin.c
+ * $ gcc -fplugin=./randomize_layout_plugin.so test.c -O2
+ */
+
+#include "gcc-common.h"
+#include "randomize_layout_seed.h"
+
+#if BUILDING_GCC_MAJOR < 4 || (BUILDING_GCC_MAJOR == 4 && BUILDING_GCC_MINOR < 7)
+#error "The RANDSTRUCT plugin requires GCC 4.7 or newer."
+#endif
+
+#define ORIG_TYPE_NAME(node) \
+	(TYPE_NAME(TYPE_MAIN_VARIANT(node)) != NULL_TREE ? ((const unsigned char *)IDENTIFIER_POINTER(TYPE_NAME(TYPE_MAIN_VARIANT(node)))) : (const unsigned char *)"anonymous")
+
+#define INFORM(loc, msg, ...)	inform(loc, "randstruct: " msg, ##__VA_ARGS__)
+#define MISMATCH(loc, how, ...)	INFORM(loc, "casting between randomized structure pointer types (" how "): %qT and %qT\n", __VA_ARGS__)
+
+__visible int plugin_is_GPL_compatible;
+
+static int performance_mode;
+
+static struct plugin_info randomize_layout_plugin_info = {
+	.version	= "201402201816vanilla",
+	.help		= "disable\t\t\tdo not activate plugin\n"
+			  "performance-mode\tenable cacheline-aware layout randomization\n"
+};
+
+struct whitelist_entry {
+	const char *pathname;
+	const char *lhs;
+	const char *rhs;
+};
+
+static const struct whitelist_entry whitelist[] = {
+	/* NIU overloads mapping with page struct */
+	{ "drivers/net/ethernet/sun/niu.c", "page", "address_space" },
+	/* unix_skb_parms via UNIXCB() buffer */
+	{ "net/unix/af_unix.c", "unix_skb_parms", "char" },
+	/* big_key payload.data struct splashing */
+	{ "security/keys/big_key.c", "path", "void *" },
+	/* walk struct security_hook_heads as an array of struct list_head */
+	{ "security/security.c", "list_head", "security_hook_heads" },
+	{ }
+};
+
+/* from old Linux dcache.h */
+static inline unsigned long
+partial_name_hash(unsigned long c, unsigned long prevhash)
+{
+	return (prevhash + (c << 4) + (c >> 4)) * 11;
+}
+static inline unsigned int
+name_hash(const unsigned char *name)
+{
+	unsigned long hash = 0;
+	unsigned int len = strlen((const char *)name);
+	while (len--)
+		hash = partial_name_hash(*name++, hash);
+	return (unsigned int)hash;
+}
+
+static tree handle_randomize_layout_attr(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
+{
+	tree type;
+
+	*no_add_attrs = true;
+	if (TREE_CODE(*node) == FUNCTION_DECL) {
+		error("%qE attribute does not apply to functions (%qF)", name, *node);
+		return NULL_TREE;
+	}
+
+	if (TREE_CODE(*node) == PARM_DECL) {
+		error("%qE attribute does not apply to function parameters (%qD)", name, *node);
+		return NULL_TREE;
+	}
+
+	if (TREE_CODE(*node) == VAR_DECL) {
+		error("%qE attribute does not apply to variables (%qD)", name, *node);
+		return NULL_TREE;
+	}
+
+	if (TYPE_P(*node)) {
+		type = *node;
+	} else {
+		gcc_assert(TREE_CODE(*node) == TYPE_DECL);
+		type = TREE_TYPE(*node);
+	}
+
+	if (TREE_CODE(type) != RECORD_TYPE) {
+		error("%qE attribute used on %qT applies to struct types only", name, type);
+		return NULL_TREE;
+	}
+
+	if (lookup_attribute(IDENTIFIER_POINTER(name), TYPE_ATTRIBUTES(type))) {
+		error("%qE attribute is already applied to the type %qT", name, type);
+		return NULL_TREE;
+	}
+
+	*no_add_attrs = false;
+
+	return NULL_TREE;
+}
+
+/* set on complete types that we don't need to inspect further at all */
+static tree handle_randomize_considered_attr(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
+{
+	*no_add_attrs = false;
+	return NULL_TREE;
+}
+
+/*
+ * set on types that we've performed a shuffle on, to prevent re-shuffling
+ * this does not preclude us from inspecting its fields for potential shuffles
+ */
+static tree handle_randomize_performed_attr(tree *node, tree name, tree args, int flags, bool *no_add_attrs)
+{
+	*no_add_attrs = false;
+	return NULL_TREE;
+}
+
+/*
+ * 64bit variant of Bob Jenkins' public domain PRNG
+ * 256 bits of internal state
+ */
+
+typedef unsigned long long u64;
+
+typedef struct ranctx { u64 a; u64 b; u64 c; u64 d; } ranctx;
+
+#define rot(x,k) (((x)<<(k))|((x)>>(64-(k))))
+static u64 ranval(ranctx *x) {
+	u64 e = x->a - rot(x->b, 7);
+	x->a = x->b ^ rot(x->c, 13);
+	x->b = x->c + rot(x->d, 37);
+	x->c = x->d + e;
+	x->d = e + x->a;
+	return x->d;
+}
+
+static void raninit(ranctx *x, u64 *seed) {
+	int i;
+
+	x->a = seed[0];
+	x->b = seed[1];
+	x->c = seed[2];
+	x->d = seed[3];
+
+	for (i=0; i < 30; ++i)
+		(void)ranval(x);
+}
+
+static u64 shuffle_seed[4];
+
+struct partition_group {
+	tree tree_start;
+	unsigned long start;
+	unsigned long length;
+};
+
+static void partition_struct(tree *fields, unsigned long length, struct partition_group *size_groups, unsigned long *num_groups)
+{
+	unsigned long i;
+	unsigned long accum_size = 0;
+	unsigned long accum_length = 0;
+	unsigned long group_idx = 0;
+
+	gcc_assert(length < INT_MAX);
+
+	memset(size_groups, 0, sizeof(struct partition_group) * length);
+
+	for (i = 0; i < length; i++) {
+		if (size_groups[group_idx].tree_start == NULL_TREE) {
+			size_groups[group_idx].tree_start = fields[i];
+			size_groups[group_idx].start = i;
+			accum_length = 0;
+			accum_size = 0;
+		}
+		accum_size += (unsigned long)int_size_in_bytes(TREE_TYPE(fields[i]));
+		accum_length++;
+		if (accum_size >= 64) {
+			size_groups[group_idx].length = accum_length;
+			accum_length = 0;
+			group_idx++;
+		}
+	}
+
+	if (size_groups[group_idx].tree_start != NULL_TREE &&
+	    !size_groups[group_idx].length) {
+		size_groups[group_idx].length = accum_length;
+		group_idx++;
+	}
+
+	*num_groups = group_idx;
+}
+
+static void performance_shuffle(tree *newtree, unsigned long length, ranctx *prng_state)
+{
+	unsigned long i, x;
+	struct partition_group size_group[length];
+	unsigned long num_groups = 0;
+	unsigned long randnum;
+
+	partition_struct(newtree, length, (struct partition_group *)&size_group, &num_groups);
+	for (i = num_groups - 1; i > 0; i--) {
+		struct partition_group tmp;
+		randnum = ranval(prng_state) % (i + 1);
+		tmp = size_group[i];
+		size_group[i] = size_group[randnum];
+		size_group[randnum] = tmp;
+	}
+
+	for (x = 0; x < num_groups; x++) {
+		for (i = size_group[x].start + size_group[x].length - 1; i > size_group[x].start; i--) {
+			tree tmp;
+			if (DECL_BIT_FIELD_TYPE(newtree[i]))
+				continue;
+			randnum = ranval(prng_state) % (i + 1);
+			// we could handle this case differently if desired
+			if (DECL_BIT_FIELD_TYPE(newtree[randnum]))
+				continue;
+			tmp = newtree[i];
+			newtree[i] = newtree[randnum];
+			newtree[randnum] = tmp;
+		}
+	}
+}
+
+static void full_shuffle(tree *newtree, unsigned long length, ranctx *prng_state)
+{
+	unsigned long i, randnum;
+
+	for (i = length - 1; i > 0; i--) {
+		tree tmp;
+		randnum = ranval(prng_state) % (i + 1);
+		tmp = newtree[i];
+		newtree[i] = newtree[randnum];
+		newtree[randnum] = tmp;
+	}
+}
+
+/* modern in-place Fisher-Yates shuffle */
+static void shuffle(const_tree type, tree *newtree, unsigned long length)
+{
+	unsigned long i;
+	u64 seed[4];
+	ranctx prng_state;
+	const unsigned char *structname;
+
+	if (length == 0)
+		return;
+
+	gcc_assert(TREE_CODE(type) == RECORD_TYPE);
+
+	structname = ORIG_TYPE_NAME(type);
+
+#ifdef __DEBUG_PLUGIN
+	fprintf(stderr, "Shuffling struct %s %p\n", (const char *)structname, type);
+#ifdef __DEBUG_VERBOSE
+	debug_tree((tree)type);
+#endif
+#endif
+
+	for (i = 0; i < 4; i++) {
+		seed[i] = shuffle_seed[i];
+		seed[i] ^= name_hash(structname);
+	}
+
+	raninit(&prng_state, (u64 *)&seed);
+
+	if (performance_mode)
+		performance_shuffle(newtree, length, &prng_state);
+	else
+		full_shuffle(newtree, length, &prng_state);
+}
+
+static bool is_flexible_array(const_tree field)
+{
+	const_tree fieldtype;
+	const_tree typesize;
+	const_tree elemtype;
+	const_tree elemsize;
+
+	fieldtype = TREE_TYPE(field);
+	typesize = TYPE_SIZE(fieldtype);
+
+	if (TREE_CODE(fieldtype) != ARRAY_TYPE)
+		return false;
+
+	elemtype = TREE_TYPE(fieldtype);
+	elemsize = TYPE_SIZE(elemtype);
+
+	/* size of type is represented in bits */
+
+	if (typesize == NULL_TREE && TYPE_DOMAIN(fieldtype) != NULL_TREE &&
+	    TYPE_MAX_VALUE(TYPE_DOMAIN(fieldtype)) == NULL_TREE)
+		return true;
+
+	if (typesize != NULL_TREE &&
+	    (TREE_CONSTANT(typesize) && (!tree_to_uhwi(typesize) ||
+	     tree_to_uhwi(typesize) == tree_to_uhwi(elemsize))))
+		return true;
+
+	return false;
+}
+
+static int relayout_struct(tree type)
+{
+	unsigned long num_fields = (unsigned long)list_length(TYPE_FIELDS(type));
+	unsigned long shuffle_length = num_fields;
+	tree field;
+	tree newtree[num_fields];
+	unsigned long i;
+	tree list;
+	tree variant;
+	tree main_variant;
+	expanded_location xloc;
+	bool has_flexarray = false;
+
+	if (TYPE_FIELDS(type) == NULL_TREE)
+		return 0;
+
+	if (num_fields < 2)
+		return 0;
+
+	gcc_assert(TREE_CODE(type) == RECORD_TYPE);
+
+	gcc_assert(num_fields < INT_MAX);
+
+	if (lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(type)) ||
+	    lookup_attribute("no_randomize_layout", TYPE_ATTRIBUTES(TYPE_MAIN_VARIANT(type))))
+		return 0;
+
+	/* Workaround for 3rd-party VirtualBox source that we can't modify ourselves */
+	if (!strcmp((const char *)ORIG_TYPE_NAME(type), "INTNETTRUNKFACTORY") ||
+	    !strcmp((const char *)ORIG_TYPE_NAME(type), "RAWPCIFACTORY"))
+		return 0;
+
+	/* throw out any structs in uapi */
+	xloc = expand_location(DECL_SOURCE_LOCATION(TYPE_FIELDS(type)));
+
+	if (strstr(xloc.file, "/uapi/"))
+		error(G_("attempted to randomize userland API struct %s"), ORIG_TYPE_NAME(type));
+
+	for (field = TYPE_FIELDS(type), i = 0; field; field = TREE_CHAIN(field), i++) {
+		gcc_assert(TREE_CODE(field) == FIELD_DECL);
+		newtree[i] = field;
+	}
+
+	/*
+	 * enforce that we don't randomize the layout of the last
+	 * element of a struct if it's a 0 or 1-length array
+	 * or a proper flexible array
+	 */
+	if (is_flexible_array(newtree[num_fields - 1])) {
+		has_flexarray = true;
+		shuffle_length--;
+	}
+
+	shuffle(type, (tree *)newtree, shuffle_length);
+
+	/*
+	 * set up a bogus anonymous struct field designed to error out on unnamed struct initializers
+	 * as gcc provides no other way to detect such code
+	 */
+	list = make_node(FIELD_DECL);
+	TREE_CHAIN(list) = newtree[0];
+	TREE_TYPE(list) = void_type_node;
+	DECL_SIZE(list) = bitsize_zero_node;
+	DECL_NONADDRESSABLE_P(list) = 1;
+	DECL_FIELD_BIT_OFFSET(list) = bitsize_zero_node;
+	DECL_SIZE_UNIT(list) = size_zero_node;
+	DECL_FIELD_OFFSET(list) = size_zero_node;
+	DECL_CONTEXT(list) = type;
+	// to satisfy the constify plugin
+	TREE_READONLY(list) = 1;
+
+	for (i = 0; i < num_fields - 1; i++)
+		TREE_CHAIN(newtree[i]) = newtree[i+1];
+	TREE_CHAIN(newtree[num_fields - 1]) = NULL_TREE;
+
+	main_variant = TYPE_MAIN_VARIANT(type);
+	for (variant = main_variant; variant; variant = TYPE_NEXT_VARIANT(variant)) {
+		TYPE_FIELDS(variant) = list;
+		TYPE_ATTRIBUTES(variant) = copy_list(TYPE_ATTRIBUTES(variant));
+		TYPE_ATTRIBUTES(variant) = tree_cons(get_identifier("randomize_performed"), NULL_TREE, TYPE_ATTRIBUTES(variant));
+		TYPE_ATTRIBUTES(variant) = tree_cons(get_identifier("designated_init"), NULL_TREE, TYPE_ATTRIBUTES(variant));
+		if (has_flexarray)
+			TYPE_ATTRIBUTES(type) = tree_cons(get_identifier("has_flexarray"), NULL_TREE, TYPE_ATTRIBUTES(type));
+	}
+
+	/*
+	 * force a re-layout of the main variant
+	 * the TYPE_SIZE for all variants will be recomputed
+	 * by finalize_type_size()
+	 */
+	TYPE_SIZE(main_variant) = NULL_TREE;
+	layout_type(main_variant);
+	gcc_assert(TYPE_SIZE(main_variant) != NULL_TREE);
+
+	return 1;
+}
+
+/* from constify plugin */
+static const_tree get_field_type(const_tree field)
+{
+	return strip_array_types(TREE_TYPE(field));
+}
+
+/* from constify plugin */
+static bool is_fptr(const_tree fieldtype)
+{
+	if (TREE_CODE(fieldtype) != POINTER_TYPE)
+		return false;
+
+	return TREE_CODE(TREE_TYPE(fieldtype)) == FUNCTION_TYPE;
+}
+
+/* derived from constify plugin */
+static int is_pure_ops_struct(const_tree node)
+{
+	const_tree field;
+
+	gcc_assert(TREE_CODE(node) == RECORD_TYPE || TREE_CODE(node) == UNION_TYPE);
+
+	/* XXX: Do not apply randomization to all-ftpr structs yet. */
+	return 0;
+
+	for (field = TYPE_FIELDS(node); field; field = TREE_CHAIN(field)) {
+		const_tree fieldtype = get_field_type(field);
+		enum tree_code code = TREE_CODE(fieldtype);
+
+		if (node == fieldtype)
+			continue;
+
+		if (!is_fptr(fieldtype))
+			return 0;
+
+		if (code != RECORD_TYPE && code != UNION_TYPE)
+			continue;
+
+		if (!is_pure_ops_struct(fieldtype))
+			return 0;
+	}
+
+	return 1;
+}
+
+static void randomize_type(tree type)
+{
+	tree variant;
+
+	gcc_assert(TREE_CODE(type) == RECORD_TYPE);
+
+	if (lookup_attribute("randomize_considered", TYPE_ATTRIBUTES(type)))
+		return;
+
+	if (lookup_attribute("randomize_layout", TYPE_ATTRIBUTES(TYPE_MAIN_VARIANT(type))) || is_pure_ops_struct(type))
+		relayout_struct(type);
+
+	for (variant = TYPE_MAIN_VARIANT(type); variant; variant = TYPE_NEXT_VARIANT(variant)) {
+		TYPE_ATTRIBUTES(type) = copy_list(TYPE_ATTRIBUTES(type));
+		TYPE_ATTRIBUTES(type) = tree_cons(get_identifier("randomize_considered"), NULL_TREE, TYPE_ATTRIBUTES(type));
+	}
+#ifdef __DEBUG_PLUGIN
+	fprintf(stderr, "Marking randomize_considered on struct %s\n", ORIG_TYPE_NAME(type));
+#ifdef __DEBUG_VERBOSE
+	debug_tree(type);
+#endif
+#endif
+}
+
+static void update_decl_size(tree decl)
+{
+	tree lastval, lastidx, field, init, type, flexsize;
+	unsigned HOST_WIDE_INT len;
+
+	type = TREE_TYPE(decl);
+
+	if (!lookup_attribute("has_flexarray", TYPE_ATTRIBUTES(type)))
+		return;
+
+	init = DECL_INITIAL(decl);
+	if (init == NULL_TREE || init == error_mark_node)
+		return;
+
+	if (TREE_CODE(init) != CONSTRUCTOR)
+		return;
+
+	len = CONSTRUCTOR_NELTS(init);
+        if (!len)
+		return;
+
+	lastval = CONSTRUCTOR_ELT(init, CONSTRUCTOR_NELTS(init) - 1)->value;
+	lastidx = CONSTRUCTOR_ELT(init, CONSTRUCTOR_NELTS(init) - 1)->index;
+
+	for (field = TYPE_FIELDS(TREE_TYPE(decl)); TREE_CHAIN(field); field = TREE_CHAIN(field))
+		;
+
+	if (lastidx != field)
+		return;
+
+	if (TREE_CODE(lastval) != STRING_CST) {
+		error("Only string constants are supported as initializers "
+		      "for randomized structures with flexible arrays");
+		return;
+	}
+
+	flexsize = bitsize_int(TREE_STRING_LENGTH(lastval) *
+		tree_to_uhwi(TYPE_SIZE(TREE_TYPE(TREE_TYPE(lastval)))));
+
+	DECL_SIZE(decl) = size_binop(PLUS_EXPR, TYPE_SIZE(type), flexsize);
+
+	return;
+}
+
+
+static void randomize_layout_finish_decl(void *event_data, void *data)
+{
+	tree decl = (tree)event_data;
+	tree type;
+
+	if (decl == NULL_TREE || decl == error_mark_node)
+		return;
+
+	type = TREE_TYPE(decl);
+
+	if (TREE_CODE(decl) != VAR_DECL)
+		return;
+
+	if (TREE_CODE(type) != RECORD_TYPE && TREE_CODE(type) != UNION_TYPE)
+		return;
+
+	if (!lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(type)))
+		return;
+
+	DECL_SIZE(decl) = 0;
+	DECL_SIZE_UNIT(decl) = 0;
+	SET_DECL_ALIGN(decl, 0);
+	SET_DECL_MODE (decl, VOIDmode);
+	SET_DECL_RTL(decl, 0);
+	update_decl_size(decl);
+	layout_decl(decl, 0);
+}
+
+static void finish_type(void *event_data, void *data)
+{
+	tree type = (tree)event_data;
+
+	if (type == NULL_TREE || type == error_mark_node)
+		return;
+
+	if (TREE_CODE(type) != RECORD_TYPE)
+		return;
+
+	if (TYPE_FIELDS(type) == NULL_TREE)
+		return;
+
+	if (lookup_attribute("randomize_considered", TYPE_ATTRIBUTES(type)))
+		return;
+
+#ifdef __DEBUG_PLUGIN
+	fprintf(stderr, "Calling randomize_type on %s\n", ORIG_TYPE_NAME(type));
+#endif
+#ifdef __DEBUG_VERBOSE
+	debug_tree(type);
+#endif
+	randomize_type(type);
+
+	return;
+}
+
+static struct attribute_spec randomize_layout_attr = {
+	.name		= "randomize_layout",
+	// related to args
+	.min_length	= 0,
+	.max_length	= 0,
+	.decl_required	= false,
+	// need type declaration
+	.type_required	= true,
+	.function_type_required = false,
+	.handler		= handle_randomize_layout_attr,
+#if BUILDING_GCC_VERSION >= 4007
+	.affects_type_identity  = true
+#endif
+};
+
+static struct attribute_spec no_randomize_layout_attr = {
+	.name		= "no_randomize_layout",
+	// related to args
+	.min_length	= 0,
+	.max_length	= 0,
+	.decl_required	= false,
+	// need type declaration
+	.type_required	= true,
+	.function_type_required = false,
+	.handler		= handle_randomize_layout_attr,
+#if BUILDING_GCC_VERSION >= 4007
+	.affects_type_identity  = true
+#endif
+};
+
+static struct attribute_spec randomize_considered_attr = {
+	.name		= "randomize_considered",
+	// related to args
+	.min_length	= 0,
+	.max_length	= 0,
+	.decl_required	= false,
+	// need type declaration
+	.type_required	= true,
+	.function_type_required = false,
+	.handler		= handle_randomize_considered_attr,
+#if BUILDING_GCC_VERSION >= 4007
+	.affects_type_identity  = false
+#endif
+};
+
+static struct attribute_spec randomize_performed_attr = {
+	.name		= "randomize_performed",
+	// related to args
+	.min_length	= 0,
+	.max_length	= 0,
+	.decl_required	= false,
+	// need type declaration
+	.type_required	= true,
+	.function_type_required = false,
+	.handler		= handle_randomize_performed_attr,
+#if BUILDING_GCC_VERSION >= 4007
+	.affects_type_identity  = false
+#endif
+};
+
+static void register_attributes(void *event_data, void *data)
+{
+	register_attribute(&randomize_layout_attr);
+	register_attribute(&no_randomize_layout_attr);
+	register_attribute(&randomize_considered_attr);
+	register_attribute(&randomize_performed_attr);
+}
+
+static void check_bad_casts_in_constructor(tree var, tree init)
+{
+	unsigned HOST_WIDE_INT idx;
+	tree field, val;
+	tree field_type, val_type;
+
+	FOR_EACH_CONSTRUCTOR_ELT(CONSTRUCTOR_ELTS(init), idx, field, val) {
+		if (TREE_CODE(val) == CONSTRUCTOR) {
+			check_bad_casts_in_constructor(var, val);
+			continue;
+		}
+
+		/* pipacs' plugin creates franken-arrays that differ from those produced by
+		   normal code which all have valid 'field' trees. work around this */
+		if (field == NULL_TREE)
+			continue;
+		field_type = TREE_TYPE(field);
+		val_type = TREE_TYPE(val);
+
+		if (TREE_CODE(field_type) != POINTER_TYPE || TREE_CODE(val_type) != POINTER_TYPE)
+			continue;
+
+		if (field_type == val_type)
+			continue;
+
+		field_type = TYPE_MAIN_VARIANT(strip_array_types(TYPE_MAIN_VARIANT(TREE_TYPE(field_type))));
+		val_type = TYPE_MAIN_VARIANT(strip_array_types(TYPE_MAIN_VARIANT(TREE_TYPE(val_type))));
+
+		if (field_type == void_type_node)
+			continue;
+		if (field_type == val_type)
+			continue;
+		if (TREE_CODE(val_type) != RECORD_TYPE)
+			continue;
+
+		if (!lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(val_type)))
+			continue;
+		MISMATCH(DECL_SOURCE_LOCATION(var), "constructor\n", TYPE_MAIN_VARIANT(field_type), TYPE_MAIN_VARIANT(val_type));
+	}
+}
+
+/* derived from the constify plugin */
+static void check_global_variables(void *event_data, void *data)
+{
+	struct varpool_node *node;
+	tree init;
+
+	FOR_EACH_VARIABLE(node) {
+		tree var = NODE_DECL(node);
+		init = DECL_INITIAL(var);
+		if (init == NULL_TREE)
+			continue;
+
+		if (TREE_CODE(init) != CONSTRUCTOR)
+			continue;
+
+		check_bad_casts_in_constructor(var, init);
+	}
+}
+
+static bool dominated_by_is_err(const_tree rhs, basic_block bb)
+{
+	basic_block dom;
+	gimple dom_stmt;
+	gimple call_stmt;
+	const_tree dom_lhs;
+	const_tree poss_is_err_cond;
+	const_tree poss_is_err_func;
+	const_tree is_err_arg;
+
+	dom = get_immediate_dominator(CDI_DOMINATORS, bb);
+	if (!dom)
+		return false;
+
+	dom_stmt = last_stmt(dom);
+	if (!dom_stmt)
+		return false;
+
+	if (gimple_code(dom_stmt) != GIMPLE_COND)
+		return false;
+
+	if (gimple_cond_code(dom_stmt) != NE_EXPR)
+		return false;
+
+	if (!integer_zerop(gimple_cond_rhs(dom_stmt)))
+		return false;
+
+	poss_is_err_cond = gimple_cond_lhs(dom_stmt);
+
+	if (TREE_CODE(poss_is_err_cond) != SSA_NAME)
+		return false;
+
+	call_stmt = SSA_NAME_DEF_STMT(poss_is_err_cond);
+
+	if (gimple_code(call_stmt) != GIMPLE_CALL)
+		return false;
+
+	dom_lhs = gimple_get_lhs(call_stmt);
+	poss_is_err_func = gimple_call_fndecl(call_stmt);
+	if (!poss_is_err_func)
+		return false;
+	if (dom_lhs != poss_is_err_cond)
+		return false;
+	if (strcmp(DECL_NAME_POINTER(poss_is_err_func), "IS_ERR"))
+		return false;
+
+	is_err_arg = gimple_call_arg(call_stmt, 0);
+	if (!is_err_arg)
+		return false;
+
+	if (is_err_arg != rhs)
+		return false;
+
+	return true;
+}
+
+static void handle_local_var_initializers(void)
+{
+	tree var;
+	unsigned int i;
+
+	FOR_EACH_LOCAL_DECL(cfun, i, var) {
+		tree init = DECL_INITIAL(var);
+		if (!init)
+			continue;
+		if (TREE_CODE(init) != CONSTRUCTOR)
+			continue;
+		check_bad_casts_in_constructor(var, init);
+	}
+}
+
+static bool type_name_eq(gimple stmt, const_tree type_tree, const char *wanted_name)
+{
+	const char *type_name;
+
+	if (type_tree == NULL_TREE)
+		return false;
+
+	switch (TREE_CODE(type_tree)) {
+	case RECORD_TYPE:
+		type_name = TYPE_NAME_POINTER(type_tree);
+		break;
+	case INTEGER_TYPE:
+		if (TYPE_PRECISION(type_tree) == CHAR_TYPE_SIZE)
+			type_name = "char";
+		else {
+			INFORM(gimple_location(stmt), "found non-char INTEGER_TYPE cast comparison: %qT\n", type_tree);
+			debug_tree(type_tree);
+			return false;
+		}
+		break;
+	case POINTER_TYPE:
+		if (TREE_CODE(TREE_TYPE(type_tree)) == VOID_TYPE) {
+			type_name = "void *";
+			break;
+		} else {
+			INFORM(gimple_location(stmt), "found non-void POINTER_TYPE cast comparison %qT\n", type_tree);
+			debug_tree(type_tree);
+			return false;
+		}
+	default:
+		INFORM(gimple_location(stmt), "unhandled cast comparison: %qT\n", type_tree);
+		debug_tree(type_tree);
+		return false;
+	}
+
+	return strcmp(type_name, wanted_name) == 0;
+}
+
+static bool whitelisted_cast(gimple stmt, const_tree lhs_tree, const_tree rhs_tree)
+{
+	const struct whitelist_entry *entry;
+	expanded_location xloc = expand_location(gimple_location(stmt));
+
+	for (entry = whitelist; entry->pathname; entry++) {
+		if (!strstr(xloc.file, entry->pathname))
+			continue;
+
+		if (type_name_eq(stmt, lhs_tree, entry->lhs) && type_name_eq(stmt, rhs_tree, entry->rhs))
+			return true;
+	}
+
+	return false;
+}
+
+/*
+ * iterate over all statements to find "bad" casts:
+ * those where the address of the start of a structure is cast
+ * to a pointer of a structure of a different type, or a
+ * structure pointer type is cast to a different structure pointer type
+ */
+static unsigned int find_bad_casts_execute(void)
+{
+	basic_block bb;
+
+	handle_local_var_initializers();
+
+	FOR_EACH_BB_FN(bb, cfun) {
+		gimple_stmt_iterator gsi;
+
+		for (gsi = gsi_start_bb(bb); !gsi_end_p(gsi); gsi_next(&gsi)) {
+			gimple stmt;
+			const_tree lhs;
+			const_tree lhs_type;
+			const_tree rhs1;
+			const_tree rhs_type;
+			const_tree ptr_lhs_type;
+			const_tree ptr_rhs_type;
+			const_tree op0;
+			const_tree op0_type;
+			enum tree_code rhs_code;
+
+			stmt = gsi_stmt(gsi);
+
+#ifdef __DEBUG_PLUGIN
+#ifdef __DEBUG_VERBOSE
+			debug_gimple_stmt(stmt);
+			debug_tree(gimple_get_lhs(stmt));
+#endif
+#endif
+
+			if (gimple_code(stmt) != GIMPLE_ASSIGN)
+				continue;
+
+#ifdef __DEBUG_PLUGIN
+#ifdef __DEBUG_VERBOSE
+			debug_tree(gimple_assign_rhs1(stmt));
+#endif
+#endif
+
+
+			rhs_code = gimple_assign_rhs_code(stmt);
+
+			if (rhs_code != ADDR_EXPR && rhs_code != SSA_NAME)
+				continue;
+
+			lhs = gimple_get_lhs(stmt);
+			lhs_type = TREE_TYPE(lhs);
+			rhs1 = gimple_assign_rhs1(stmt);
+			rhs_type = TREE_TYPE(rhs1);
+
+			if (TREE_CODE(rhs_type) != POINTER_TYPE ||
+			    TREE_CODE(lhs_type) != POINTER_TYPE)
+				continue;
+
+			ptr_lhs_type = TYPE_MAIN_VARIANT(strip_array_types(TYPE_MAIN_VARIANT(TREE_TYPE(lhs_type))));
+			ptr_rhs_type = TYPE_MAIN_VARIANT(strip_array_types(TYPE_MAIN_VARIANT(TREE_TYPE(rhs_type))));
+
+			if (ptr_rhs_type == void_type_node)
+				continue;
+
+			if (ptr_lhs_type == void_type_node)
+				continue;
+
+			if (dominated_by_is_err(rhs1, bb))
+				continue;
+
+			if (TREE_CODE(ptr_rhs_type) != RECORD_TYPE) {
+#ifndef __DEBUG_PLUGIN
+				if (lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(ptr_lhs_type)))
+#endif
+				{
+					if (!whitelisted_cast(stmt, ptr_lhs_type, ptr_rhs_type))
+						MISMATCH(gimple_location(stmt), "rhs", ptr_lhs_type, ptr_rhs_type);
+				}
+				continue;
+			}
+
+			if (rhs_code == SSA_NAME && ptr_lhs_type == ptr_rhs_type)
+				continue;
+
+			if (rhs_code == ADDR_EXPR) {
+				op0 = TREE_OPERAND(rhs1, 0);
+
+				if (op0 == NULL_TREE)
+					continue;
+
+				if (TREE_CODE(op0) != VAR_DECL)
+					continue;
+
+				op0_type = TYPE_MAIN_VARIANT(strip_array_types(TYPE_MAIN_VARIANT(TREE_TYPE(op0))));
+				if (op0_type == ptr_lhs_type)
+					continue;
+
+#ifndef __DEBUG_PLUGIN
+				if (lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(op0_type)))
+#endif
+				{
+					if (!whitelisted_cast(stmt, ptr_lhs_type, op0_type))
+						MISMATCH(gimple_location(stmt), "op0", ptr_lhs_type, op0_type);
+				}
+			} else {
+				const_tree ssa_name_var = SSA_NAME_VAR(rhs1);
+				/* skip bogus type casts introduced by container_of */
+				if (ssa_name_var != NULL_TREE && DECL_NAME(ssa_name_var) && 
+				    !strcmp((const char *)DECL_NAME_POINTER(ssa_name_var), "__mptr"))
+					continue;
+#ifndef __DEBUG_PLUGIN
+				if (lookup_attribute("randomize_performed", TYPE_ATTRIBUTES(ptr_rhs_type)))
+#endif
+				{
+					if (!whitelisted_cast(stmt, ptr_lhs_type, ptr_rhs_type))
+						MISMATCH(gimple_location(stmt), "ssa", ptr_lhs_type, ptr_rhs_type);
+				}
+			}
+
+		}
+	}
+	return 0;
+}
+
+#define PASS_NAME find_bad_casts
+#define NO_GATE
+#define TODO_FLAGS_FINISH TODO_dump_func
+#include "gcc-generate-gimple-pass.h"
+
+__visible int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+{
+	int i;
+	const char * const plugin_name = plugin_info->base_name;
+	const int argc = plugin_info->argc;
+	const struct plugin_argument * const argv = plugin_info->argv;
+	bool enable = true;
+	int obtained_seed = 0;
+	struct register_pass_info find_bad_casts_pass_info;
+
+	find_bad_casts_pass_info.pass			= make_find_bad_casts_pass();
+	find_bad_casts_pass_info.reference_pass_name	= "ssa";
+	find_bad_casts_pass_info.ref_pass_instance_number	= 1;
+	find_bad_casts_pass_info.pos_op			= PASS_POS_INSERT_AFTER;
+
+	if (!plugin_default_version_check(version, &gcc_version)) {
+		error(G_("incompatible gcc/plugin versions"));
+		return 1;
+	}
+
+	if (strncmp(lang_hooks.name, "GNU C", 5) && !strncmp(lang_hooks.name, "GNU C+", 6)) {
+		inform(UNKNOWN_LOCATION, G_("%s supports C only, not %s"), plugin_name, lang_hooks.name);
+		enable = false;
+	}
+
+	for (i = 0; i < argc; ++i) {
+		if (!strcmp(argv[i].key, "disable")) {
+			enable = false;
+			continue;
+		}
+		if (!strcmp(argv[i].key, "performance-mode")) {
+			performance_mode = 1;
+			continue;
+		}
+		error(G_("unknown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
+	}
+
+	if (strlen(randstruct_seed) != 64) {
+		error(G_("invalid seed value supplied for %s plugin"), plugin_name);
+		return 1;
+	}
+	obtained_seed = sscanf(randstruct_seed, "%016llx%016llx%016llx%016llx",
+		&shuffle_seed[0], &shuffle_seed[1], &shuffle_seed[2], &shuffle_seed[3]);
+	if (obtained_seed != 4) {
+		error(G_("Invalid seed supplied for %s plugin"), plugin_name);
+		return 1;
+	}
+
+	register_callback(plugin_name, PLUGIN_INFO, NULL, &randomize_layout_plugin_info);
+	if (enable) {
+		register_callback(plugin_name, PLUGIN_ALL_IPA_PASSES_START, check_global_variables, NULL);
+		register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &find_bad_casts_pass_info);
+		register_callback(plugin_name, PLUGIN_FINISH_TYPE, finish_type, NULL);
+		register_callback(plugin_name, PLUGIN_FINISH_DECL, randomize_layout_finish_decl, NULL);
+	}
+	register_callback(plugin_name, PLUGIN_ATTRIBUTES, register_attributes, NULL);
+
+	return 0;
+}
diff --git a/security/keys/internal.h b/security/keys/internal.h
index c0f8682eba69..6494954e9980 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -197,7 +197,7 @@ struct request_key_auth {
 	void			*callout_info;
 	size_t			callout_len;
 	pid_t			pid;
-};
+} __randomize_layout;
 
 extern struct key_type key_type_request_key_auth;
 extern struct key *request_key_auth_new(struct key *target,