x86/mpx: remove MPX from arch/x86

From: Dave Hansen <dave.hansen@linux.intel.com>

MPX is being removed from the kernel due to a lack of support
in the toolchain going forward (gcc).

This removes all the remaining (dead at this point) MPX handling
code remaining in the tree.  The only remaining code is the XSAVE
support for MPX state which is currently needd for KVM to handle
VMs which might use MPX.

Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: x86@kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>

3 files changed, 0 insertions, 945 deletions

diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index fab095362c50..5bfd5aef5378 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -19,7 +19,6 @@
 #include <asm/tlbflush.h>
 #include <asm/pgalloc.h>
 #include <asm/elf.h>
-#include <asm/mpx.h>
 
 #if 0	/* This is just for testing */
 struct page *
@@ -151,10 +150,6 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 	if (len & ~huge_page_mask(h))
 		return -EINVAL;
 
-	addr = mpx_unmapped_area_check(addr, len, flags);
-	if (IS_ERR_VALUE(addr))
-		return addr;
-
 	if (len > TASK_SIZE)
 		return -ENOMEM;
 
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index aae9a933dfd4..cb91eccc4960 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -163,8 +163,6 @@ unsigned long get_mmap_base(int is_legacy)
 
 const char *arch_vma_name(struct vm_area_struct *vma)
 {
-	if (vma->vm_flags & VM_MPX)
-		return "[mpx]";
 	return NULL;
 }
 
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
deleted file mode 100644
index 895fb7a9294d..000000000000
--- a/arch/x86/mm/mpx.c
+++ /dev/null
@@ -1,938 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * mpx.c - Memory Protection eXtensions
- *
- * Copyright (c) 2014, Intel Corporation.
- * Qiaowei Ren <qiaowei.ren@intel.com>
- * Dave Hansen <dave.hansen@intel.com>
- */
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/mm_types.h>
-#include <linux/mman.h>
-#include <linux/syscalls.h>
-#include <linux/sched/sysctl.h>
-
-#include <asm/insn.h>
-#include <asm/insn-eval.h>
-#include <asm/mmu_context.h>
-#include <asm/mpx.h>
-#include <asm/processor.h>
-#include <asm/fpu/internal.h>
-
-#define CREATE_TRACE_POINTS
-#include <asm/trace/mpx.h>
-
-static inline unsigned long mpx_bd_size_bytes(struct mm_struct *mm)
-{
-	if (is_64bit_mm(mm))
-		return MPX_BD_SIZE_BYTES_64;
-	else
-		return MPX_BD_SIZE_BYTES_32;
-}
-
-static inline unsigned long mpx_bt_size_bytes(struct mm_struct *mm)
-{
-	if (is_64bit_mm(mm))
-		return MPX_BT_SIZE_BYTES_64;
-	else
-		return MPX_BT_SIZE_BYTES_32;
-}
-
-/*
- * This is really a simplified "vm_mmap". it only handles MPX
- * bounds tables (the bounds directory is user-allocated).
- */
-static unsigned long mpx_mmap(unsigned long len)
-{
-	struct mm_struct *mm = current->mm;
-	unsigned long addr, populate;
-
-	/* Only bounds table can be allocated here */
-	if (len != mpx_bt_size_bytes(mm))
-		return -EINVAL;
-
-	down_write(&mm->mmap_sem);
-	addr = do_mmap(NULL, 0, len, PROT_READ | PROT_WRITE,
-		       MAP_ANONYMOUS | MAP_PRIVATE, VM_MPX, 0, &populate, NULL);
-	up_write(&mm->mmap_sem);
-	if (populate)
-		mm_populate(addr, populate);
-
-	return addr;
-}
-
-static int mpx_insn_decode(struct insn *insn,
-			   struct pt_regs *regs)
-{
-	unsigned char buf[MAX_INSN_SIZE];
-	int x86_64 = !test_thread_flag(TIF_IA32);
-	int not_copied;
-	int nr_copied;
-
-	not_copied = copy_from_user(buf, (void __user *)regs->ip, sizeof(buf));
-	nr_copied = sizeof(buf) - not_copied;
-	/*
-	 * The decoder _should_ fail nicely if we pass it a short buffer.
-	 * But, let's not depend on that implementation detail.  If we
-	 * did not get anything, just error out now.
-	 */
-	if (!nr_copied)
-		return -EFAULT;
-	insn_init(insn, buf, nr_copied, x86_64);
-	insn_get_length(insn);
-	/*
-	 * copy_from_user() tries to get as many bytes as we could see in
-	 * the largest possible instruction.  If the instruction we are
-	 * after is shorter than that _and_ we attempt to copy from
-	 * something unreadable, we might get a short read.  This is OK
-	 * as long as the read did not stop in the middle of the
-	 * instruction.  Check to see if we got a partial instruction.
-	 */
-	if (nr_copied < insn->length)
-		return -EFAULT;
-
-	insn_get_opcode(insn);
-	/*
-	 * We only _really_ need to decode bndcl/bndcn/bndcu
-	 * Error out on anything else.
-	 */
-	if (insn->opcode.bytes[0] != 0x0f)
-		goto bad_opcode;
-	if ((insn->opcode.bytes[1] != 0x1a) &&
-	    (insn->opcode.bytes[1] != 0x1b))
-		goto bad_opcode;
-
-	return 0;
-bad_opcode:
-	return -EINVAL;
-}
-
-/*
- * If a bounds overflow occurs then a #BR is generated. This
- * function decodes MPX instructions to get violation address
- * and set this address into extended struct siginfo.
- *
- * Note that this is not a super precise way of doing this.
- * Userspace could have, by the time we get here, written
- * anything it wants in to the instructions.  We can not
- * trust anything about it.  They might not be valid
- * instructions or might encode invalid registers, etc...
- */
-int mpx_fault_info(struct mpx_fault_info *info, struct pt_regs *regs)
-{
-	const struct mpx_bndreg_state *bndregs;
-	const struct mpx_bndreg *bndreg;
-	struct insn insn;
-	uint8_t bndregno;
-	int err;
-
-	err = mpx_insn_decode(&insn, regs);
-	if (err)
-		goto err_out;
-
-	/*
-	 * We know at this point that we are only dealing with
-	 * MPX instructions.
-	 */
-	insn_get_modrm(&insn);
-	bndregno = X86_MODRM_REG(insn.modrm.value);
-	if (bndregno > 3) {
-		err = -EINVAL;
-		goto err_out;
-	}
-	/* get bndregs field from current task's xsave area */
-	bndregs = get_xsave_field_ptr(XFEATURE_BNDREGS);
-	if (!bndregs) {
-		err = -EINVAL;
-		goto err_out;
-	}
-	/* now go select the individual register in the set of 4 */
-	bndreg = &bndregs->bndreg[bndregno];
-
-	/*
-	 * The registers are always 64-bit, but the upper 32
-	 * bits are ignored in 32-bit mode.  Also, note that the
-	 * upper bounds are architecturally represented in 1's
-	 * complement form.
-	 *
-	 * The 'unsigned long' cast is because the compiler
-	 * complains when casting from integers to different-size
-	 * pointers.
-	 */
-	info->lower = (void __user *)(unsigned long)bndreg->lower_bound;
-	info->upper = (void __user *)(unsigned long)~bndreg->upper_bound;
-	info->addr  = insn_get_addr_ref(&insn, regs);
-
-	/*
-	 * We were not able to extract an address from the instruction,
-	 * probably because there was something invalid in it.
-	 */
-	if (info->addr == (void __user *)-1) {
-		err = -EINVAL;
-		goto err_out;
-	}
-	trace_mpx_bounds_register_exception(info->addr, bndreg);
-	return 0;
-err_out:
-	/* info might be NULL, but kfree() handles that */
-	return err;
-}
-
-static __user void *mpx_get_bounds_dir(void)
-{
-	const struct mpx_bndcsr *bndcsr;
-
-	if (!cpu_feature_enabled(X86_FEATURE_MPX))
-		return MPX_INVALID_BOUNDS_DIR;
-
-	/*
-	 * The bounds directory pointer is stored in a register
-	 * only accessible if we first do an xsave.
-	 */
-	bndcsr = get_xsave_field_ptr(XFEATURE_BNDCSR);
-	if (!bndcsr)
-		return MPX_INVALID_BOUNDS_DIR;
-
-	/*
-	 * Make sure the register looks valid by checking the
-	 * enable bit.
-	 */
-	if (!(bndcsr->bndcfgu & MPX_BNDCFG_ENABLE_FLAG))
-		return MPX_INVALID_BOUNDS_DIR;
-
-	/*
-	 * Lastly, mask off the low bits used for configuration
-	 * flags, and return the address of the bounds table.
-	 */
-	return (void __user *)(unsigned long)
-		(bndcsr->bndcfgu & MPX_BNDCFG_ADDR_MASK);
-}
-
-int mpx_enable_management(void)
-{
-	void __user *bd_base = MPX_INVALID_BOUNDS_DIR;
-	struct mm_struct *mm = current->mm;
-	int ret = 0;
-
-	/*
-	 * runtime in the userspace will be responsible for allocation of
-	 * the bounds directory. Then, it will save the base of the bounds
-	 * directory into XSAVE/XRSTOR Save Area and enable MPX through
-	 * XRSTOR instruction.
-	 *
-	 * The copy_xregs_to_kernel() beneath get_xsave_field_ptr() is
-	 * expected to be relatively expensive. Storing the bounds
-	 * directory here means that we do not have to do xsave in the
-	 * unmap path; we can just use mm->context.bd_addr instead.
-	 */
-	bd_base = mpx_get_bounds_dir();
-	down_write(&mm->mmap_sem);
-
-	/* MPX doesn't support addresses above 47 bits yet. */
-	if (find_vma(mm, DEFAULT_MAP_WINDOW)) {
-		pr_warn_once("%s (%d): MPX cannot handle addresses "
-				"above 47-bits. Disabling.",
-				current->comm, current->pid);
-		ret = -ENXIO;
-		goto out;
-	}
-	mm->context.bd_addr = bd_base;
-	if (mm->context.bd_addr == MPX_INVALID_BOUNDS_DIR)
-		ret = -ENXIO;
-out:
-	up_write(&mm->mmap_sem);
-	return ret;
-}
-
-int mpx_disable_management(void)
-{
-	struct mm_struct *mm = current->mm;
-
-	if (!cpu_feature_enabled(X86_FEATURE_MPX))
-		return -ENXIO;
-
-	down_write(&mm->mmap_sem);
-	mm->context.bd_addr = MPX_INVALID_BOUNDS_DIR;
-	up_write(&mm->mmap_sem);
-	return 0;
-}
-
-static int mpx_cmpxchg_bd_entry(struct mm_struct *mm,
-		unsigned long *curval,
-		unsigned long __user *addr,
-		unsigned long old_val, unsigned long new_val)
-{
-	int ret;
-	/*
-	 * user_atomic_cmpxchg_inatomic() actually uses sizeof()
-	 * the pointer that we pass to it to figure out how much
-	 * data to cmpxchg.  We have to be careful here not to
-	 * pass a pointer to a 64-bit data type when we only want
-	 * a 32-bit copy.
-	 */
-	if (is_64bit_mm(mm)) {
-		ret = user_atomic_cmpxchg_inatomic(curval,
-				addr, old_val, new_val);
-	} else {
-		u32 uninitialized_var(curval_32);
-		u32 old_val_32 = old_val;
-		u32 new_val_32 = new_val;
-		u32 __user *addr_32 = (u32 __user *)addr;
-
-		ret = user_atomic_cmpxchg_inatomic(&curval_32,
-				addr_32, old_val_32, new_val_32);
-		*curval = curval_32;
-	}
-	return ret;
-}
-
-/*
- * With 32-bit mode, a bounds directory is 4MB, and the size of each
- * bounds table is 16KB. With 64-bit mode, a bounds directory is 2GB,
- * and the size of each bounds table is 4MB.
- */
-static int allocate_bt(struct mm_struct *mm, long __user *bd_entry)
-{
-	unsigned long expected_old_val = 0;
-	unsigned long actual_old_val = 0;
-	unsigned long bt_addr;
-	unsigned long bd_new_entry;
-	int ret = 0;
-
-	/*
-	 * Carve the virtual space out of userspace for the new
-	 * bounds table:
-	 */
-	bt_addr = mpx_mmap(mpx_bt_size_bytes(mm));
-	if (IS_ERR((void *)bt_addr))
-		return PTR_ERR((void *)bt_addr);
-	/*
-	 * Set the valid flag (kinda like _PAGE_PRESENT in a pte)
-	 */
-	bd_new_entry = bt_addr | MPX_BD_ENTRY_VALID_FLAG;
-
-	/*
-	 * Go poke the address of the new bounds table in to the
-	 * bounds directory entry out in userspace memory.  Note:
-	 * we may race with another CPU instantiating the same table.
-	 * In that case the cmpxchg will see an unexpected
-	 * 'actual_old_val'.
-	 *
-	 * This can fault, but that's OK because we do not hold
-	 * mmap_sem at this point, unlike some of the other part
-	 * of the MPX code that have to pagefault_disable().
-	 */
-	ret = mpx_cmpxchg_bd_entry(mm, &actual_old_val,	bd_entry,
-				   expected_old_val, bd_new_entry);
-	if (ret)
-		goto out_unmap;
-
-	/*
-	 * The user_atomic_cmpxchg_inatomic() will only return nonzero
-	 * for faults, *not* if the cmpxchg itself fails.  Now we must
-	 * verify that the cmpxchg itself completed successfully.
-	 */
-	/*
-	 * We expected an empty 'expected_old_val', but instead found
-	 * an apparently valid entry.  Assume we raced with another
-	 * thread to instantiate this table and desclare succecss.
-	 */
-	if (actual_old_val & MPX_BD_ENTRY_VALID_FLAG) {
-		ret = 0;
-		goto out_unmap;
-	}
-	/*
-	 * We found a non-empty bd_entry but it did not have the
-	 * VALID_FLAG set.  Return an error which will result in
-	 * a SEGV since this probably means that somebody scribbled
-	 * some invalid data in to a bounds table.
-	 */
-	if (expected_old_val != actual_old_val) {
-		ret = -EINVAL;
-		goto out_unmap;
-	}
-	trace_mpx_new_bounds_table(bt_addr);
-	return 0;
-out_unmap:
-	vm_munmap(bt_addr, mpx_bt_size_bytes(mm));
-	return ret;
-}
-
-/*
- * When a BNDSTX instruction attempts to save bounds to a bounds
- * table, it will first attempt to look up the table in the
- * first-level bounds directory.  If it does not find a table in
- * the directory, a #BR is generated and we get here in order to
- * allocate a new table.
- *
- * With 32-bit mode, the size of BD is 4MB, and the size of each
- * bound table is 16KB. With 64-bit mode, the size of BD is 2GB,
- * and the size of each bound table is 4MB.
- */
-static int do_mpx_bt_fault(void)
-{
-	unsigned long bd_entry, bd_base;
-	const struct mpx_bndcsr *bndcsr;
-	struct mm_struct *mm = current->mm;
-
-	bndcsr = get_xsave_field_ptr(XFEATURE_BNDCSR);
-	if (!bndcsr)
-		return -EINVAL;
-	/*
-	 * Mask off the preserve and enable bits
-	 */
-	bd_base = bndcsr->bndcfgu & MPX_BNDCFG_ADDR_MASK;
-	/*
-	 * The hardware provides the address of the missing or invalid
-	 * entry via BNDSTATUS, so we don't have to go look it up.
-	 */
-	bd_entry = bndcsr->bndstatus & MPX_BNDSTA_ADDR_MASK;
-	/*
-	 * Make sure the directory entry is within where we think
-	 * the directory is.
-	 */
-	if ((bd_entry < bd_base) ||
-	    (bd_entry >= bd_base + mpx_bd_size_bytes(mm)))
-		return -EINVAL;
-
-	return allocate_bt(mm, (long __user *)bd_entry);
-}
-
-int mpx_handle_bd_fault(void)
-{
-	/*
-	 * Userspace never asked us to manage the bounds tables,
-	 * so refuse to help.
-	 */
-	if (!kernel_managing_mpx_tables(current->mm))
-		return -EINVAL;
-
-	return do_mpx_bt_fault();
-}
-
-/*
- * A thin wrapper around get_user_pages().  Returns 0 if the
- * fault was resolved or -errno if not.
- */
-static int mpx_resolve_fault(long __user *addr, int write)
-{
-	long gup_ret;
-	int nr_pages = 1;
-
-	gup_ret = get_user_pages((unsigned long)addr, nr_pages,
-			write ? FOLL_WRITE : 0,	NULL, NULL);
-	/*
-	 * get_user_pages() returns number of pages gotten.
-	 * 0 means we failed to fault in and get anything,
-	 * probably because 'addr' is bad.
-	 */
-	if (!gup_ret)
-		return -EFAULT;
-	/* Other error, return it */
-	if (gup_ret < 0)
-		return gup_ret;
-	/* must have gup'd a page and gup_ret>0, success */
-	return 0;
-}
-
-static unsigned long mpx_bd_entry_to_bt_addr(struct mm_struct *mm,
-					     unsigned long bd_entry)
-{
-	unsigned long bt_addr = bd_entry;
-	int align_to_bytes;
-	/*
-	 * Bit 0 in a bt_entry is always the valid bit.
-	 */
-	bt_addr &= ~MPX_BD_ENTRY_VALID_FLAG;
-	/*
-	 * Tables are naturally aligned at 8-byte boundaries
-	 * on 64-bit and 4-byte boundaries on 32-bit.  The
-	 * documentation makes it appear that the low bits
-	 * are ignored by the hardware, so we do the same.
-	 */
-	if (is_64bit_mm(mm))
-		align_to_bytes = 8;
-	else
-		align_to_bytes = 4;
-	bt_addr &= ~(align_to_bytes-1);
-	return bt_addr;
-}
-
-/*
- * We only want to do a 4-byte get_user() on 32-bit.  Otherwise,
- * we might run off the end of the bounds table if we are on
- * a 64-bit kernel and try to get 8 bytes.
- */
-static int get_user_bd_entry(struct mm_struct *mm, unsigned long *bd_entry_ret,
-		long __user *bd_entry_ptr)
-{
-	u32 bd_entry_32;
-	int ret;
-
-	if (is_64bit_mm(mm))
-		return get_user(*bd_entry_ret, bd_entry_ptr);
-
-	/*
-	 * Note that get_user() uses the type of the *pointer* to
-	 * establish the size of the get, not the destination.
-	 */
-	ret = get_user(bd_entry_32, (u32 __user *)bd_entry_ptr);
-	*bd_entry_ret = bd_entry_32;
-	return ret;
-}
-
-/*
- * Get the base of bounds tables pointed by specific bounds
- * directory entry.
- */
-static int get_bt_addr(struct mm_struct *mm,
-			long __user *bd_entry_ptr,
-			unsigned long *bt_addr_result)
-{
-	int ret;
-	int valid_bit;
-	unsigned long bd_entry;
-	unsigned long bt_addr;
-
-	if (!access_ok((bd_entry_ptr), sizeof(*bd_entry_ptr)))
-		return -EFAULT;
-
-	while (1) {
-		int need_write = 0;
-
-		pagefault_disable();
-		ret = get_user_bd_entry(mm, &bd_entry, bd_entry_ptr);
-		pagefault_enable();
-		if (!ret)
-			break;
-		if (ret == -EFAULT)
-			ret = mpx_resolve_fault(bd_entry_ptr, need_write);
-		/*
-		 * If we could not resolve the fault, consider it
-		 * userspace's fault and error out.
-		 */
-		if (ret)
-			return ret;
-	}
-
-	valid_bit = bd_entry & MPX_BD_ENTRY_VALID_FLAG;
-	bt_addr = mpx_bd_entry_to_bt_addr(mm, bd_entry);
-
-	/*
-	 * When the kernel is managing bounds tables, a bounds directory
-	 * entry will either have a valid address (plus the valid bit)
-	 * *OR* be completely empty. If we see a !valid entry *and* some
-	 * data in the address field, we know something is wrong. This
-	 * -EINVAL return will cause a SIGSEGV.
-	 */
-	if (!valid_bit && bt_addr)
-		return -EINVAL;
-	/*
-	 * Do we have an completely zeroed bt entry?  That is OK.  It
-	 * just means there was no bounds table for this memory.  Make
-	 * sure to distinguish this from -EINVAL, which will cause
-	 * a SEGV.
-	 */
-	if (!valid_bit)
-		return -ENOENT;
-
-	*bt_addr_result = bt_addr;
-	return 0;
-}
-
-static inline int bt_entry_size_bytes(struct mm_struct *mm)
-{
-	if (is_64bit_mm(mm))
-		return MPX_BT_ENTRY_BYTES_64;
-	else
-		return MPX_BT_ENTRY_BYTES_32;
-}
-
-/*
- * Take a virtual address and turns it in to the offset in bytes
- * inside of the bounds table where the bounds table entry
- * controlling 'addr' can be found.
- */
-static unsigned long mpx_get_bt_entry_offset_bytes(struct mm_struct *mm,
-		unsigned long addr)
-{
-	unsigned long bt_table_nr_entries;
-	unsigned long offset = addr;
-
-	if (is_64bit_mm(mm)) {
-		/* Bottom 3 bits are ignored on 64-bit */
-		offset >>= 3;
-		bt_table_nr_entries = MPX_BT_NR_ENTRIES_64;
-	} else {
-		/* Bottom 2 bits are ignored on 32-bit */
-		offset >>= 2;
-		bt_table_nr_entries = MPX_BT_NR_ENTRIES_32;
-	}
-	/*
-	 * We know the size of the table in to which we are
-	 * indexing, and we have eliminated all the low bits
-	 * which are ignored for indexing.
-	 *
-	 * Mask out all the high bits which we do not need
-	 * to index in to the table.  Note that the tables
-	 * are always powers of two so this gives us a proper
-	 * mask.
-	 */
-	offset &= (bt_table_nr_entries-1);
-	/*
-	 * We now have an entry offset in terms of *entries* in
-	 * the table.  We need to scale it back up to bytes.
-	 */
-	offset *= bt_entry_size_bytes(mm);
-	return offset;
-}
-
-/*
- * How much virtual address space does a single bounds
- * directory entry cover?
- *
- * Note, we need a long long because 4GB doesn't fit in
- * to a long on 32-bit.
- */
-static inline unsigned long bd_entry_virt_space(struct mm_struct *mm)
-{
-	unsigned long long virt_space;
-	unsigned long long GB = (1ULL << 30);
-
-	/*
-	 * This covers 32-bit emulation as well as 32-bit kernels
-	 * running on 64-bit hardware.
-	 */
-	if (!is_64bit_mm(mm))
-		return (4ULL * GB) / MPX_BD_NR_ENTRIES_32;
-
-	/*
-	 * 'x86_virt_bits' returns what the hardware is capable
-	 * of, and returns the full >32-bit address space when
-	 * running 32-bit kernels on 64-bit hardware.
-	 */
-	virt_space = (1ULL << boot_cpu_data.x86_virt_bits);
-	return virt_space / MPX_BD_NR_ENTRIES_64;
-}
-
-/*
- * Free the backing physical pages of bounds table 'bt_addr'.
- * Assume start...end is within that bounds table.
- */
-static noinline int zap_bt_entries_mapping(struct mm_struct *mm,
-		unsigned long bt_addr,
-		unsigned long start_mapping, unsigned long end_mapping)
-{
-	struct vm_area_struct *vma;
-	unsigned long addr, len;
-	unsigned long start;
-	unsigned long end;
-
-	/*
-	 * if we 'end' on a boundary, the offset will be 0 which
-	 * is not what we want.  Back it up a byte to get the
-	 * last bt entry.  Then once we have the entry itself,
-	 * move 'end' back up by the table entry size.
-	 */
-	start = bt_addr + mpx_get_bt_entry_offset_bytes(mm, start_mapping);
-	end   = bt_addr + mpx_get_bt_entry_offset_bytes(mm, end_mapping - 1);
-	/*
-	 * Move end back up by one entry.  Among other things
-	 * this ensures that it remains page-aligned and does
-	 * not screw up zap_page_range()
-	 */
-	end += bt_entry_size_bytes(mm);
-
-	/*
-	 * Find the first overlapping vma. If vma->vm_start > start, there
-	 * will be a hole in the bounds table. This -EINVAL return will
-	 * cause a SIGSEGV.
-	 */
-	vma = find_vma(mm, start);
-	if (!vma || vma->vm_start > start)
-		return -EINVAL;
-
-	/*
-	 * A NUMA policy on a VM_MPX VMA could cause this bounds table to
-	 * be split. So we need to look across the entire 'start -> end'
-	 * range of this bounds table, find all of the VM_MPX VMAs, and
-	 * zap only those.
-	 */
-	addr = start;
-	while (vma && vma->vm_start < end) {
-		/*
-		 * We followed a bounds directory entry down
-		 * here.  If we find a non-MPX VMA, that's bad,
-		 * so stop immediately and return an error.  This
-		 * probably results in a SIGSEGV.
-		 */
-		if (!(vma->vm_flags & VM_MPX))
-			return -EINVAL;
-
-		len = min(vma->vm_end, end) - addr;
-		zap_page_range(vma, addr, len);
-		trace_mpx_unmap_zap(addr, addr+len);
-
-		vma = vma->vm_next;
-		addr = vma->vm_start;
-	}
-	return 0;
-}
-
-static unsigned long mpx_get_bd_entry_offset(struct mm_struct *mm,
-		unsigned long addr)
-{
-	/*
-	 * There are several ways to derive the bd offsets.  We
-	 * use the following approach here:
-	 * 1. We know the size of the virtual address space
-	 * 2. We know the number of entries in a bounds table
-	 * 3. We know that each entry covers a fixed amount of
-	 *    virtual address space.
-	 * So, we can just divide the virtual address by the
-	 * virtual space used by one entry to determine which
-	 * entry "controls" the given virtual address.
-	 */
-	if (is_64bit_mm(mm)) {
-		int bd_entry_size = 8; /* 64-bit pointer */
-		/*
-		 * Take the 64-bit addressing hole in to account.
-		 */
-		addr &= ((1UL << boot_cpu_data.x86_virt_bits) - 1);
-		return (addr / bd_entry_virt_space(mm)) * bd_entry_size;
-	} else {
-		int bd_entry_size = 4; /* 32-bit pointer */
-		/*
-		 * 32-bit has no hole so this case needs no mask
-		 */
-		return (addr / bd_entry_virt_space(mm)) * bd_entry_size;
-	}
-	/*
-	 * The two return calls above are exact copies.  If we
-	 * pull out a single copy and put it in here, gcc won't
-	 * realize that we're doing a power-of-2 divide and use
-	 * shifts.  It uses a real divide.  If we put them up
-	 * there, it manages to figure it out (gcc 4.8.3).
-	 */
-}
-
-static int unmap_entire_bt(struct mm_struct *mm,
-		long __user *bd_entry, unsigned long bt_addr)
-{
-	unsigned long expected_old_val = bt_addr | MPX_BD_ENTRY_VALID_FLAG;
-	unsigned long uninitialized_var(actual_old_val);
-	int ret;
-
-	while (1) {
-		int need_write = 1;
-		unsigned long cleared_bd_entry = 0;
-
-		pagefault_disable();
-		ret = mpx_cmpxchg_bd_entry(mm, &actual_old_val,
-				bd_entry, expected_old_val, cleared_bd_entry);
-		pagefault_enable();
-		if (!ret)
-			break;
-		if (ret == -EFAULT)
-			ret = mpx_resolve_fault(bd_entry, need_write);
-		/*
-		 * If we could not resolve the fault, consider it
-		 * userspace's fault and error out.
-		 */
-		if (ret)
-			return ret;
-	}
-	/*
-	 * The cmpxchg was performed, check the results.
-	 */
-	if (actual_old_val != expected_old_val) {
-		/*
-		 * Someone else raced with us to unmap the table.
-		 * That is OK, since we were both trying to do
-		 * the same thing.  Declare success.
-		 */
-		if (!actual_old_val)
-			return 0;
-		/*
-		 * Something messed with the bounds directory
-		 * entry.  We hold mmap_sem for read or write
-		 * here, so it could not be a _new_ bounds table
-		 * that someone just allocated.  Something is
-		 * wrong, so pass up the error and SIGSEGV.
-		 */
-		return -EINVAL;
-	}
-	/*
-	 * Note, we are likely being called under do_munmap() already. To
-	 * avoid recursion, do_munmap() will check whether it comes
-	 * from one bounds table through VM_MPX flag.
-	 */
-	return do_munmap(mm, bt_addr, mpx_bt_size_bytes(mm), NULL);
-}
-
-static int try_unmap_single_bt(struct mm_struct *mm,
-	       unsigned long start, unsigned long end)
-{
-	struct vm_area_struct *next;
-	struct vm_area_struct *prev;
-	/*
-	 * "bta" == Bounds Table Area: the area controlled by the
-	 * bounds table that we are unmapping.
-	 */
-	unsigned long bta_start_vaddr = start & ~(bd_entry_virt_space(mm)-1);
-	unsigned long bta_end_vaddr = bta_start_vaddr + bd_entry_virt_space(mm);
-	unsigned long uninitialized_var(bt_addr);
-	void __user *bde_vaddr;
-	int ret;
-	/*
-	 * We already unlinked the VMAs from the mm's rbtree so 'start'
-	 * is guaranteed to be in a hole. This gets us the first VMA
-	 * before the hole in to 'prev' and the next VMA after the hole
-	 * in to 'next'.
-	 */
-	next = find_vma_prev(mm, start, &prev);
-	/*
-	 * Do not count other MPX bounds table VMAs as neighbors.
-	 * Although theoretically possible, we do not allow bounds
-	 * tables for bounds tables so our heads do not explode.
-	 * If we count them as neighbors here, we may end up with
-	 * lots of tables even though we have no actual table
-	 * entries in use.
-	 */
-	while (next && (next->vm_flags & VM_MPX))
-		next = next->vm_next;
-	while (prev && (prev->vm_flags & VM_MPX))
-		prev = prev->vm_prev;
-	/*
-	 * We know 'start' and 'end' lie within an area controlled
-	 * by a single bounds table.  See if there are any other
-	 * VMAs controlled by that bounds table.  If there are not
-	 * then we can "expand" the are we are unmapping to possibly
-	 * cover the entire table.
-	 */
-	next = find_vma_prev(mm, start, &prev);
-	if ((!prev || prev->vm_end <= bta_start_vaddr) &&
-	    (!next || next->vm_start >= bta_end_vaddr)) {
-		/*
-		 * No neighbor VMAs controlled by same bounds
-		 * table.  Try to unmap the whole thing
-		 */
-		start = bta_start_vaddr;
-		end = bta_end_vaddr;
-	}
-
-	bde_vaddr = mm->context.bd_addr + mpx_get_bd_entry_offset(mm, start);
-	ret = get_bt_addr(mm, bde_vaddr, &bt_addr);
-	/*
-	 * No bounds table there, so nothing to unmap.
-	 */
-	if (ret == -ENOENT) {
-		ret = 0;
-		return 0;
-	}
-	if (ret)
-		return ret;
-	/*
-	 * We are unmapping an entire table.  Either because the
-	 * unmap that started this whole process was large enough
-	 * to cover an entire table, or that the unmap was small
-	 * but was the area covered by a bounds table.
-	 */
-	if ((start == bta_start_vaddr) &&
-	    (end == bta_end_vaddr))
-		return unmap_entire_bt(mm, bde_vaddr, bt_addr);
-	return zap_bt_entries_mapping(mm, bt_addr, start, end);
-}
-
-static int mpx_unmap_tables(struct mm_struct *mm,
-		unsigned long start, unsigned long end)
-{
-	unsigned long one_unmap_start;
-	trace_mpx_unmap_search(start, end);
-
-	one_unmap_start = start;
-	while (one_unmap_start < end) {
-		int ret;
-		unsigned long next_unmap_start = ALIGN(one_unmap_start+1,
-						       bd_entry_virt_space(mm));
-		unsigned long one_unmap_end = end;
-		/*
-		 * if the end is beyond the current bounds table,
-		 * move it back so we only deal with a single one
-		 * at a time
-		 */
-		if (one_unmap_end > next_unmap_start)
-			one_unmap_end = next_unmap_start;
-		ret = try_unmap_single_bt(mm, one_unmap_start, one_unmap_end);
-		if (ret)
-			return ret;
-
-		one_unmap_start = next_unmap_start;
-	}
-	return 0;
-}
-
-/*
- * Free unused bounds tables covered in a virtual address region being
- * munmap()ed. Assume end > start.
- *
- * This function will be called by do_munmap(), and the VMAs covering
- * the virtual address region start...end have already been split if
- * necessary, and the 'vma' is the first vma in this range (start -> end).
- */
-void mpx_notify_unmap(struct mm_struct *mm, unsigned long start,
-		      unsigned long end)
-{
-	struct vm_area_struct *vma;
-	int ret;
-
-	/*
-	 * Refuse to do anything unless userspace has asked
-	 * the kernel to help manage the bounds tables,
-	 */
-	if (!kernel_managing_mpx_tables(current->mm))
-		return;
-	/*
-	 * This will look across the entire 'start -> end' range,
-	 * and find all of the non-VM_MPX VMAs.
-	 *
-	 * To avoid recursion, if a VM_MPX vma is found in the range
-	 * (start->end), we will not continue follow-up work. This
-	 * recursion represents having bounds tables for bounds tables,
-	 * which should not occur normally. Being strict about it here
-	 * helps ensure that we do not have an exploitable stack overflow.
-	 */
-	vma = find_vma(mm, start);
-	while (vma && vma->vm_start < end) {
-		if (vma->vm_flags & VM_MPX)
-			return;
-		vma = vma->vm_next;
-	}
-
-	ret = mpx_unmap_tables(mm, start, end);
-	if (ret)
-		force_sig(SIGSEGV);
-}
-
-/* MPX cannot handle addresses above 47 bits yet. */
-unsigned long mpx_unmapped_area_check(unsigned long addr, unsigned long len,
-		unsigned long flags)
-{
-	if (!kernel_managing_mpx_tables(current->mm))
-		return addr;
-	if (addr + len <= DEFAULT_MAP_WINDOW)
-		return addr;
-	if (flags & MAP_FIXED)
-		return -ENOMEM;
-
-	/*
-	 * Requested len is larger than the whole area we're allowed to map in.
-	 * Resetting hinting address wouldn't do much good -- fail early.
-	 */
-	if (len > DEFAULT_MAP_WINDOW)
-		return -ENOMEM;
-
-	/* Look for unmap area within DEFAULT_MAP_WINDOW */
-	return 0;
-}