Merge tag 'usercopy-v4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardened usercopy whitelisting from Kees Cook:
 "Currently, hardened usercopy performs dynamic bounds checking on slab
  cache objects. This is good, but still leaves a lot of kernel memory
  available to be copied to/from userspace in the face of bugs.

  To further restrict what memory is available for copying, this creates
  a way to whitelist specific areas of a given slab cache object for
  copying to/from userspace, allowing much finer granularity of access
  control.

  Slab caches that are never exposed to userspace can declare no
  whitelist for their objects, thereby keeping them unavailable to
  userspace via dynamic copy operations. (Note, an implicit form of
  whitelisting is the use of constant sizes in usercopy operations and
  get_user()/put_user(); these bypass all hardened usercopy checks since
  these sizes cannot change at runtime.)

  This new check is WARN-by-default, so any mistakes can be found over
  the next several releases without breaking anyone's system.

  The series has roughly the following sections:
   - remove %p and improve reporting with offset
   - prepare infrastructure and whitelist kmalloc
   - update VFS subsystem with whitelists
   - update SCSI subsystem with whitelists
   - update network subsystem with whitelists
   - update process memory with whitelists
   - update per-architecture thread_struct with whitelists
   - update KVM with whitelists and fix ioctl bug
   - mark all other allocations as not whitelisted
   - update lkdtm for more sensible test overage"

* tag 'usercopy-v4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: (38 commits)
  lkdtm: Update usercopy tests for whitelisting
  usercopy: Restrict non-usercopy caches to size 0
  kvm: x86: fix KVM_XEN_HVM_CONFIG ioctl
  kvm: whitelist struct kvm_vcpu_arch
  arm: Implement thread_struct whitelist for hardened usercopy
  arm64: Implement thread_struct whitelist for hardened usercopy
  x86: Implement thread_struct whitelist for hardened usercopy
  fork: Provide usercopy whitelisting for task_struct
  fork: Define usercopy region in thread_stack slab caches
  fork: Define usercopy region in mm_struct slab caches
  net: Restrict unwhitelisted proto caches to size 0
  sctp: Copy struct sctp_sock.autoclose to userspace using put_user()
  sctp: Define usercopy region in SCTP proto slab cache
  caif: Define usercopy region in caif proto slab cache
  ip: Define usercopy region in IP proto slab cache
  net: Define usercopy region in struct proto slab cache
  scsi: Define usercopy region in scsi_sense_cache slab cache
  cifs: Define usercopy region in cifs_request slab cache
  vxfs: Define usercopy region in vxfs_inode slab cache
  ufs: Define usercopy region in ufs_inode_cache slab cache
  ...

45 files changed, 515 insertions, 215 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index d007b2a15b22..467dfa35bf96 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -245,6 +245,17 @@ config ARCH_TASK_STRUCT_ON_STACK
 config ARCH_TASK_STRUCT_ALLOCATOR
 	bool
 
+config HAVE_ARCH_THREAD_STRUCT_WHITELIST
+	bool
+	depends on !ARCH_TASK_STRUCT_ALLOCATOR
+	help
+	  An architecture should select this to provide hardened usercopy
+	  knowledge about what region of the thread_struct should be
+	  whitelisted for copying to userspace. Normally this is only the
+	  FPU registers. Specifically, arch_thread_struct_whitelist()
+	  should be implemented. Without this, the entire thread_struct
+	  field in task_struct will be left whitelisted.
+
 # Select if arch has its private alloc_thread_stack() function
 config ARCH_THREAD_STACK_ALLOCATOR
 	bool
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4daddc53e7bc..7e3d53575486 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -51,6 +51,7 @@ config ARM
 	select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
 	select HAVE_ARCH_MMAP_RND_BITS if MMU
 	select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
+	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARM_SMCCC if CPU_V7
 	select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32
diff --git a/arch/arm/include/asm/processor.h b/arch/arm/include/asm/processor.h
index 338cbe0a18ef..1bf65b47808a 100644
--- a/arch/arm/include/asm/processor.h
+++ b/arch/arm/include/asm/processor.h
@@ -45,6 +45,16 @@ struct thread_struct {
 	struct debug_info	debug;
 };
 
+/*
+ * Everything usercopied to/from thread_struct is statically-sized, so
+ * no hardened usercopy whitelist is needed.
+ */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+						unsigned long *size)
+{
+	*offset = *size = 0;
+}
+
 #define INIT_THREAD  {	}
 
 #define start_thread(regs,pc,sp)					\
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index b2b95f79c746..53612879fe56 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -91,6 +91,7 @@ config ARM64
 	select HAVE_ARCH_MMAP_RND_BITS
 	select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT
 	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_VMAP_STACK
diff --git a/arch/arm64/include/asm/processor.h b/arch/arm64/include/asm/processor.h
index cee4ae25a5d1..6db43ebd648d 100644
--- a/arch/arm64/include/asm/processor.h
+++ b/arch/arm64/include/asm/processor.h
@@ -113,6 +113,16 @@ struct thread_struct {
 	struct debug_info	debug;		/* debugging */
 };
 
+/*
+ * Everything usercopied to/from thread_struct is statically-sized, so
+ * no hardened usercopy whitelist is needed.
+ */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+						unsigned long *size)
+{
+	*offset = *size = 0;
+}
+
 #ifdef CONFIG_COMPAT
 #define task_user_tls(t)						\
 ({									\
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 72d5149bcaa1..b0771ceabb4b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -116,6 +116,7 @@ config X86
 	select HAVE_ARCH_MMAP_RND_COMPAT_BITS	if MMU && COMPAT
 	select HAVE_ARCH_COMPAT_MMAP_BASES	if MMU && COMPAT
 	select HAVE_ARCH_SECCOMP_FILTER
+	select HAVE_ARCH_THREAD_STRUCT_WHITELIST
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index efbde088a718..6207f2f740b6 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -507,6 +507,14 @@ struct thread_struct {
 	 */
 };
 
+/* Whitelist the FPU state from the task_struct for hardened usercopy. */
+static inline void arch_thread_struct_whitelist(unsigned long *offset,
+						unsigned long *size)
+{
+	*offset = offsetof(struct thread_struct, fpu.state);
+	*size = fpu_kernel_xstate_size;
+}
+
 /*
  * Thread-synchronous status.
  *
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c53298dfbf50..5040ff9de6ab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4237,13 +4237,14 @@ set_identity_unlock:
 		mutex_unlock(&kvm->lock);
 		break;
 	case KVM_XEN_HVM_CONFIG: {
+		struct kvm_xen_hvm_config xhc;
 		r = -EFAULT;
-		if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
-				   sizeof(struct kvm_xen_hvm_config)))
+		if (copy_from_user(&xhc, argp, sizeof(xhc)))
 			goto out;
 		r = -EINVAL;
-		if (kvm->arch.xen_hvm_config.flags)
+		if (xhc.flags)
 			goto out;
+		memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc));
 		r = 0;
 		break;
 	}
diff --git a/drivers/misc/lkdtm.h b/drivers/misc/lkdtm.h
index 687a0dbbe199..9e513dcfd809 100644
--- a/drivers/misc/lkdtm.h
+++ b/drivers/misc/lkdtm.h
@@ -76,8 +76,8 @@ void __init lkdtm_usercopy_init(void);
 void __exit lkdtm_usercopy_exit(void);
 void lkdtm_USERCOPY_HEAP_SIZE_TO(void);
 void lkdtm_USERCOPY_HEAP_SIZE_FROM(void);
-void lkdtm_USERCOPY_HEAP_FLAG_TO(void);
-void lkdtm_USERCOPY_HEAP_FLAG_FROM(void);
+void lkdtm_USERCOPY_HEAP_WHITELIST_TO(void);
+void lkdtm_USERCOPY_HEAP_WHITELIST_FROM(void);
 void lkdtm_USERCOPY_STACK_FRAME_TO(void);
 void lkdtm_USERCOPY_STACK_FRAME_FROM(void);
 void lkdtm_USERCOPY_STACK_BEYOND(void);
diff --git a/drivers/misc/lkdtm_core.c b/drivers/misc/lkdtm_core.c
index 4942da93d066..2154d1bfd18b 100644
--- a/drivers/misc/lkdtm_core.c
+++ b/drivers/misc/lkdtm_core.c
@@ -177,8 +177,8 @@ static const struct crashtype crashtypes[] = {
 	CRASHTYPE(ATOMIC_TIMING),
 	CRASHTYPE(USERCOPY_HEAP_SIZE_TO),
 	CRASHTYPE(USERCOPY_HEAP_SIZE_FROM),
-	CRASHTYPE(USERCOPY_HEAP_FLAG_TO),
-	CRASHTYPE(USERCOPY_HEAP_FLAG_FROM),
+	CRASHTYPE(USERCOPY_HEAP_WHITELIST_TO),
+	CRASHTYPE(USERCOPY_HEAP_WHITELIST_FROM),
 	CRASHTYPE(USERCOPY_STACK_FRAME_TO),
 	CRASHTYPE(USERCOPY_STACK_FRAME_FROM),
 	CRASHTYPE(USERCOPY_STACK_BEYOND),
diff --git a/drivers/misc/lkdtm_usercopy.c b/drivers/misc/lkdtm_usercopy.c
index a64372cc148d..9725aed305bb 100644
--- a/drivers/misc/lkdtm_usercopy.c
+++ b/drivers/misc/lkdtm_usercopy.c
@@ -20,7 +20,7 @@
  */
 static volatile size_t unconst = 0;
 static volatile size_t cache_size = 1024;
-static struct kmem_cache *bad_cache;
+static struct kmem_cache *whitelist_cache;
 
 static const unsigned char test_text[] = "This is a test.\n";
 
@@ -115,10 +115,16 @@ free_user:
 	vm_munmap(user_addr, PAGE_SIZE);
 }
 
+/*
+ * This checks for whole-object size validation with hardened usercopy,
+ * with or without usercopy whitelisting.
+ */
 static void do_usercopy_heap_size(bool to_user)
 {
 	unsigned long user_addr;
 	unsigned char *one, *two;
+	void __user *test_user_addr;
+	void *test_kern_addr;
 	size_t size = unconst + 1024;
 
 	one = kmalloc(size, GFP_KERNEL);
@@ -139,27 +145,30 @@ static void do_usercopy_heap_size(bool to_user)
 	memset(one, 'A', size);
 	memset(two, 'B', size);
 
+	test_user_addr = (void __user *)(user_addr + 16);
+	test_kern_addr = one + 16;
+
 	if (to_user) {
 		pr_info("attempting good copy_to_user of correct size\n");
-		if (copy_to_user((void __user *)user_addr, one, size)) {
+		if (copy_to_user(test_user_addr, test_kern_addr, size / 2)) {
 			pr_warn("copy_to_user failed unexpectedly?!\n");
 			goto free_user;
 		}
 
 		pr_info("attempting bad copy_to_user of too large size\n");
-		if (copy_to_user((void __user *)user_addr, one, 2 * size)) {
+		if (copy_to_user(test_user_addr, test_kern_addr, size)) {
 			pr_warn("copy_to_user failed, but lacked Oops\n");
 			goto free_user;
 		}
 	} else {
 		pr_info("attempting good copy_from_user of correct size\n");
-		if (copy_from_user(one, (void __user *)user_addr, size)) {
+		if (copy_from_user(test_kern_addr, test_user_addr, size / 2)) {
 			pr_warn("copy_from_user failed unexpectedly?!\n");
 			goto free_user;
 		}
 
 		pr_info("attempting bad copy_from_user of too large size\n");
-		if (copy_from_user(one, (void __user *)user_addr, 2 * size)) {
+		if (copy_from_user(test_kern_addr, test_user_addr, size)) {
 			pr_warn("copy_from_user failed, but lacked Oops\n");
 			goto free_user;
 		}
@@ -172,77 +181,79 @@ free_kernel:
 	kfree(two);
 }
 
-static void do_usercopy_heap_flag(bool to_user)
+/*
+ * This checks for the specific whitelist window within an object. If this
+ * test passes, then do_usercopy_heap_size() tests will pass too.
+ */
+static void do_usercopy_heap_whitelist(bool to_user)
 {
-	unsigned long user_addr;
-	unsigned char *good_buf = NULL;
-	unsigned char *bad_buf = NULL;
+	unsigned long user_alloc;
+	unsigned char *buf = NULL;
+	unsigned char __user *user_addr;
+	size_t offset, size;
 
 	/* Make sure cache was prepared. */
-	if (!bad_cache) {
+	if (!whitelist_cache) {
 		pr_warn("Failed to allocate kernel cache\n");
 		return;
 	}
 
 	/*
-	 * Allocate one buffer from each cache (kmalloc will have the
-	 * SLAB_USERCOPY flag already, but "bad_cache" won't).
+	 * Allocate a buffer with a whitelisted window in the buffer.
 	 */
-	good_buf = kmalloc(cache_size, GFP_KERNEL);
-	bad_buf = kmem_cache_alloc(bad_cache, GFP_KERNEL);
-	if (!good_buf || !bad_buf) {
-		pr_warn("Failed to allocate buffers from caches\n");
+	buf = kmem_cache_alloc(whitelist_cache, GFP_KERNEL);
+	if (!buf) {
+		pr_warn("Failed to allocate buffer from whitelist cache\n");
 		goto free_alloc;
 	}
 
 	/* Allocate user memory we'll poke at. */
-	user_addr = vm_mmap(NULL, 0, PAGE_SIZE,
+	user_alloc = vm_mmap(NULL, 0, PAGE_SIZE,
 			    PROT_READ | PROT_WRITE | PROT_EXEC,
 			    MAP_ANONYMOUS | MAP_PRIVATE, 0);
-	if (user_addr >= TASK_SIZE) {
+	if (user_alloc >= TASK_SIZE) {
 		pr_warn("Failed to allocate user memory\n");
 		goto free_alloc;
 	}
+	user_addr = (void __user *)user_alloc;
 
-	memset(good_buf, 'A', cache_size);
-	memset(bad_buf, 'B', cache_size);
+	memset(buf, 'B', cache_size);
+
+	/* Whitelisted window in buffer, from kmem_cache_create_usercopy. */
+	offset = (cache_size / 4) + unconst;
+	size = (cache_size / 16) + unconst;
 
 	if (to_user) {
-		pr_info("attempting good copy_to_user with SLAB_USERCOPY\n");
-		if (copy_to_user((void __user *)user_addr, good_buf,
-				 cache_size)) {
+		pr_info("attempting good copy_to_user inside whitelist\n");
+		if (copy_to_user(user_addr, buf + offset, size)) {
 			pr_warn("copy_to_user failed unexpectedly?!\n");
 			goto free_user;
 		}
 
-		pr_info("attempting bad copy_to_user w/o SLAB_USERCOPY\n");
-		if (copy_to_user((void __user *)user_addr, bad_buf,
-				 cache_size)) {
+		pr_info("attempting bad copy_to_user outside whitelist\n");
+		if (copy_to_user(user_addr, buf + offset - 1, size)) {
 			pr_warn("copy_to_user failed, but lacked Oops\n");
 			goto free_user;
 		}
 	} else {
-		pr_info("attempting good copy_from_user with SLAB_USERCOPY\n");
-		if (copy_from_user(good_buf, (void __user *)user_addr,
-				   cache_size)) {
+		pr_info("attempting good copy_from_user inside whitelist\n");
+		if (copy_from_user(buf + offset, user_addr, size)) {
 			pr_warn("copy_from_user failed unexpectedly?!\n");
 			goto free_user;
 		}
 
-		pr_info("attempting bad copy_from_user w/o SLAB_USERCOPY\n");
-		if (copy_from_user(bad_buf, (void __user *)user_addr,
-				   cache_size)) {
+		pr_info("attempting bad copy_from_user outside whitelist\n");
+		if (copy_from_user(buf + offset - 1, user_addr, size)) {
 			pr_warn("copy_from_user failed, but lacked Oops\n");
 			goto free_user;
 		}
 	}
 
 free_user:
-	vm_munmap(user_addr, PAGE_SIZE);
+	vm_munmap(user_alloc, PAGE_SIZE);
 free_alloc:
-	if (bad_buf)
-		kmem_cache_free(bad_cache, bad_buf);
-	kfree(good_buf);
+	if (buf)
+		kmem_cache_free(whitelist_cache, buf);
 }
 
 /* Callable tests. */
@@ -256,14 +267,14 @@ void lkdtm_USERCOPY_HEAP_SIZE_FROM(void)
 	do_usercopy_heap_size(false);
 }
 
-void lkdtm_USERCOPY_HEAP_FLAG_TO(void)
+void lkdtm_USERCOPY_HEAP_WHITELIST_TO(void)
 {
-	do_usercopy_heap_flag(true);
+	do_usercopy_heap_whitelist(true);
 }
 
-void lkdtm_USERCOPY_HEAP_FLAG_FROM(void)
+void lkdtm_USERCOPY_HEAP_WHITELIST_FROM(void)
 {
-	do_usercopy_heap_flag(false);
+	do_usercopy_heap_whitelist(false);
 }
 
 void lkdtm_USERCOPY_STACK_FRAME_TO(void)
@@ -314,11 +325,15 @@ free_user:
 void __init lkdtm_usercopy_init(void)
 {
 	/* Prepare cache that lacks SLAB_USERCOPY flag. */
-	bad_cache = kmem_cache_create("lkdtm-no-usercopy", cache_size, 0,
-				      0, NULL);
+	whitelist_cache =
+		kmem_cache_create_usercopy("lkdtm-usercopy", cache_size,
+					   0, 0,
+					   cache_size / 4,
+					   cache_size / 16,
+					   NULL);
 }
 
 void __exit lkdtm_usercopy_exit(void)
 {
-	kmem_cache_destroy(bad_cache);
+	kmem_cache_destroy(whitelist_cache);
 }
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 976c936029cb..8efe4731ed89 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -79,14 +79,15 @@ int scsi_init_sense_cache(struct Scsi_Host *shost)
 	if (shost->unchecked_isa_dma) {
 		scsi_sense_isadma_cache =
 			kmem_cache_create("scsi_sense_cache(DMA)",
-			SCSI_SENSE_BUFFERSIZE, 0,
-			SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA, NULL);
+				SCSI_SENSE_BUFFERSIZE, 0,
+				SLAB_HWCACHE_ALIGN | SLAB_CACHE_DMA, NULL);
 		if (!scsi_sense_isadma_cache)
 			ret = -ENOMEM;
 	} else {
 		scsi_sense_cache =
-			kmem_cache_create("scsi_sense_cache",
-			SCSI_SENSE_BUFFERSIZE, 0, SLAB_HWCACHE_ALIGN, NULL);
+			kmem_cache_create_usercopy("scsi_sense_cache",
+				SCSI_SENSE_BUFFERSIZE, 0, SLAB_HWCACHE_ALIGN,
+				0, SCSI_SENSE_BUFFERSIZE, NULL);
 		if (!scsi_sense_cache)
 			ret = -ENOMEM;
 	}
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index ee236231cafa..af2832aaeec5 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -444,11 +444,15 @@ unacquire_none:
 static int __init
 befs_init_inodecache(void)
 {
-	befs_inode_cachep = kmem_cache_create("befs_inode_cache",
-					      sizeof (struct befs_inode_info),
-					      0, (SLAB_RECLAIM_ACCOUNT|
-						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
-					      init_once);
+	befs_inode_cachep = kmem_cache_create_usercopy("befs_inode_cache",
+				sizeof(struct befs_inode_info), 0,
+				(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
+					SLAB_ACCOUNT),
+				offsetof(struct befs_inode_info,
+					i_data.symlink),
+				sizeof_field(struct befs_inode_info,
+					i_data.symlink),
+				init_once);
 	if (befs_inode_cachep == NULL)
 		return -ENOMEM;
 
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index a7be591d8e18..32cdea67bbfd 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1239,9 +1239,11 @@ cifs_init_request_bufs(void)
 	cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
 		 CIFSMaxBufSize, CIFSMaxBufSize);
 */
-	cifs_req_cachep = kmem_cache_create("cifs_request",
+	cifs_req_cachep = kmem_cache_create_usercopy("cifs_request",
 					    CIFSMaxBufSize + max_hdr_size, 0,
-					    SLAB_HWCACHE_ALIGN, NULL);
+					    SLAB_HWCACHE_ALIGN, 0,
+					    CIFSMaxBufSize + max_hdr_size,
+					    NULL);
 	if (cifs_req_cachep == NULL)
 		return -ENOMEM;
 
@@ -1267,9 +1269,9 @@ cifs_init_request_bufs(void)
 	more SMBs to use small buffer alloc and is still much more
 	efficient to alloc 1 per page off the slab compared to 17K (5page)
 	alloc of large cifs buffers even when page debugging is on */
-	cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
+	cifs_sm_req_cachep = kmem_cache_create_usercopy("cifs_small_rq",
 			MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
-			NULL);
+			0, MAX_CIFS_SMALL_BUFFER_SIZE, NULL);
 	if (cifs_sm_req_cachep == NULL) {
 		mempool_destroy(cifs_req_poolp);
 		kmem_cache_destroy(cifs_req_cachep);
diff --git a/fs/dcache.c b/fs/dcache.c
index 5b207e0de459..cca2b377ff0a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3602,8 +3602,9 @@ static void __init dcache_init(void)
 	 * but it is probably not worth it because of the cache nature
 	 * of the dcache.
 	 */
-	dentry_cache = KMEM_CACHE(dentry,
-		SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD|SLAB_ACCOUNT);
+	dentry_cache = KMEM_CACHE_USERCOPY(dentry,
+		SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
+		d_iname);
 
 	/* Hash may have been set up in dcache_init_early */
 	if (!hashdist)
@@ -3641,8 +3642,8 @@ void __init vfs_caches_init_early(void)
 
 void __init vfs_caches_init(void)
 {
-	names_cachep = kmem_cache_create("names_cache", PATH_MAX, 0,
-			SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
+	names_cachep = kmem_cache_create_usercopy("names_cache", PATH_MAX, 0,
+			SLAB_HWCACHE_ALIGN|SLAB_PANIC, 0, PATH_MAX, NULL);
 
 	dcache_init();
 	inode_init();
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index 7e244093c0e5..179cd5c2f52a 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -193,10 +193,13 @@ static void exofs_init_once(void *foo)
  */
 static int init_inodecache(void)
 {
-	exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
+	exofs_inode_cachep = kmem_cache_create_usercopy("exofs_inode_cache",
 				sizeof(struct exofs_i_info), 0,
 				SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
-				SLAB_ACCOUNT, exofs_init_once);
+				SLAB_ACCOUNT,
+				offsetof(struct exofs_i_info, i_data),
+				sizeof_field(struct exofs_i_info, i_data),
+				exofs_init_once);
 	if (exofs_inode_cachep == NULL)
 		return -ENOMEM;
 	return 0;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 554c98b8a93a..db5f9daa7780 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -221,11 +221,13 @@ static void init_once(void *foo)
 
 static int __init init_inodecache(void)
 {
-	ext2_inode_cachep = kmem_cache_create("ext2_inode_cache",
-					     sizeof(struct ext2_inode_info),
-					     0, (SLAB_RECLAIM_ACCOUNT|
-						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
-					     init_once);
+	ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache",
+				sizeof(struct ext2_inode_info), 0,
+				(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
+					SLAB_ACCOUNT),
+				offsetof(struct ext2_inode_info, i_data),
+				sizeof_field(struct ext2_inode_info, i_data),
+				init_once);
 	if (ext2_inode_cachep == NULL)
 		return -ENOMEM;
 	return 0;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 82eead1c8b84..899e6faf3381 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1038,11 +1038,13 @@ static void init_once(void *foo)
 
 static int __init init_inodecache(void)
 {
-	ext4_inode_cachep = kmem_cache_create("ext4_inode_cache",
-					     sizeof(struct ext4_inode_info),
-					     0, (SLAB_RECLAIM_ACCOUNT|
-						SLAB_MEM_SPREAD|SLAB_ACCOUNT),
-					     init_once);
+	ext4_inode_cachep = kmem_cache_create_usercopy("ext4_inode_cache",
+				sizeof(struct ext4_inode_info), 0,
+				(SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
+					SLAB_ACCOUNT),
+				offsetof(struct ext4_inode_info, i_data),
+				sizeof_field(struct ext4_inode_info, i_data),
+				init_once);
 	if (ext4_inode_cachep == NULL)
 		return -ENOMEM;
 	return 0;
diff --git a/fs/fhandle.c b/fs/fhandle.c
index 0ace128f5d23..0ee727485615 100644
--- a/fs/fhandle.c
+++ b/fs/fhandle.c
@@ -69,8 +69,7 @@ static long do_sys_name_to_handle(struct path *path,
 	} else
 		retval = 0;
 	/* copy the mount id */
-	if (copy_to_user(mnt_id, &real_mount(path->mnt)->mnt_id,
-			 sizeof(*mnt_id)) ||
+	if (put_user(real_mount(path->mnt)->mnt_id, mnt_id) ||
 	    copy_to_user(ufh, handle,
 			 sizeof(struct file_handle) + handle_bytes))
 		retval = -EFAULT;
diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c
index f989efa051a0..48b24bb50d02 100644
--- a/fs/freevxfs/vxfs_super.c
+++ b/fs/freevxfs/vxfs_super.c
@@ -332,9 +332,13 @@ vxfs_init(void)
 {
 	int rv;
 
-	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
+	vxfs_inode_cachep = kmem_cache_create_usercopy("vxfs_inode",
 			sizeof(struct vxfs_inode_info), 0,
-			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
+			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
+			offsetof(struct vxfs_inode_info, vii_immed.vi_immed),
+			sizeof_field(struct vxfs_inode_info,
+				vii_immed.vi_immed),
+			NULL);
 	if (!vxfs_inode_cachep)
 		return -ENOMEM;
 	rv = register_filesystem(&vxfs_fs_type);
diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 90373aebfdca..1b9264fd54b6 100644
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -965,9 +965,11 @@ static int __init init_jfs_fs(void)
 	int rc;
 
 	jfs_inode_cachep =
-	    kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0,
-			    SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
-			    init_once);
+	    kmem_cache_create_usercopy("jfs_ip", sizeof(struct jfs_inode_info),
+			0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_ACCOUNT,
+			offsetof(struct jfs_inode_info, i_inline),
+			sizeof_field(struct jfs_inode_info, i_inline),
+			init_once);
 	if (jfs_inode_cachep == NULL)
 		return -ENOMEM;
 
diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
index 36f1390b5ed7..62d49e53061c 100644
--- a/fs/orangefs/super.c
+++ b/