[S390] Add dynamic size check for usercopy functions.
authorGerald Schaefer <geraldsc@de.ibm.com>
Mon, 4 Dec 2006 14:40:45 +0000 (15:40 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Mon, 4 Dec 2006 14:40:45 +0000 (15:40 +0100)
Use a wrapper for copy_to/from_user to chose the best usercopy method.
The mvcos instruction is better for sizes greater than 256 bytes, if
mvcos is not available a page table walk is better for sizes greater
than 1024 bytes. Also removed the redundant copy_to/from_user_std_small
functions.

Signed-off-by: Gerald Schaefer <geraldsc@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/lib/Makefile
arch/s390/lib/uaccess_mvcos.c
arch/s390/lib/uaccess_pt.c [new file with mode: 0644]
arch/s390/lib/uaccess_std.c

index b0cfa6c4883d57e7a848970beca6657c3907b0b5..b5f94cf3bde8d190d09c66fec8bfcc289d5f3292 100644 (file)
@@ -4,7 +4,7 @@
 
 EXTRA_AFLAGS := -traditional
 
-lib-y += delay.o string.o uaccess_std.o
+lib-y += delay.o string.o uaccess_std.o uaccess_pt.o
 lib-$(CONFIG_32BIT) += div64.o
 lib-$(CONFIG_64BIT) += uaccess_mvcos.o
 lib-$(CONFIG_SMP) += spinlock.o
index 121b2935a422a2e724ce97cd9dd49aaa61cc26a7..f9a23d57eb79fa63713a7ac87e85f1991c30280f 100644 (file)
@@ -27,6 +27,9 @@
 #define SLR    "slgr"
 #endif
 
+extern size_t copy_from_user_std(size_t, const void __user *, void *);
+extern size_t copy_to_user_std(size_t, void __user *, const void *);
+
 size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
 {
        register unsigned long reg0 asm("0") = 0x81UL;
@@ -66,6 +69,13 @@ size_t copy_from_user_mvcos(size_t size, const void __user *ptr, void *x)
        return size;
 }
 
+size_t copy_from_user_mvcos_check(size_t size, const void __user *ptr, void *x)
+{
+       if (size <= 256)
+               return copy_from_user_std(size, ptr, x);
+       return copy_from_user_mvcos(size, ptr, x);
+}
+
 size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
 {
        register unsigned long reg0 asm("0") = 0x810000UL;
@@ -95,6 +105,13 @@ size_t copy_to_user_mvcos(size_t size, void __user *ptr, const void *x)
        return size;
 }
 
+size_t copy_to_user_mvcos_check(size_t size, void __user *ptr, const void *x)
+{
+       if (size <= 256)
+               return copy_to_user_std(size, ptr, x);
+       return copy_to_user_mvcos(size, ptr, x);
+}
+
 size_t copy_in_user_mvcos(size_t size, void __user *to, const void __user *from)
 {
        register unsigned long reg0 asm("0") = 0x810081UL;
@@ -145,18 +162,16 @@ size_t clear_user_mvcos(size_t size, void __user *to)
        return size;
 }
 
-extern size_t copy_from_user_std_small(size_t, const void __user *, void *);
-extern size_t copy_to_user_std_small(size_t, void __user *, const void *);
 extern size_t strnlen_user_std(size_t, const char __user *);
 extern size_t strncpy_from_user_std(size_t, const char __user *, char *);
 extern int futex_atomic_op(int, int __user *, int, int *);
 extern int futex_atomic_cmpxchg(int __user *, int, int);
 
 struct uaccess_ops uaccess_mvcos = {
-       .copy_from_user = copy_from_user_mvcos,
-       .copy_from_user_small = copy_from_user_std_small,
-       .copy_to_user = copy_to_user_mvcos,
-       .copy_to_user_small = copy_to_user_std_small,
+       .copy_from_user = copy_from_user_mvcos_check,
+       .copy_from_user_small = copy_from_user_std,
+       .copy_to_user = copy_to_user_mvcos_check,
+       .copy_to_user_small = copy_to_user_std,
        .copy_in_user = copy_in_user_mvcos,
        .clear_user = clear_user_mvcos,
        .strnlen_user = strnlen_user_std,
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
new file mode 100644 (file)
index 0000000..8741bdc
--- /dev/null
@@ -0,0 +1,153 @@
+/*
+ *  arch/s390/lib/uaccess_pt.c
+ *
+ *  User access functions based on page table walks.
+ *
+ *    Copyright IBM Corp. 2006
+ *    Author(s): Gerald Schaefer (gerald.schaefer@de.ibm.com)
+ */
+
+#include <linux/errno.h>
+#include <asm/uaccess.h>
+#include <linux/mm.h>
+#include <asm/futex.h>
+
+static inline int __handle_fault(struct mm_struct *mm, unsigned long address,
+                                int write_access)
+{
+       struct vm_area_struct *vma;
+       int ret = -EFAULT;
+
+       down_read(&mm->mmap_sem);
+       vma = find_vma(mm, address);
+       if (unlikely(!vma))
+               goto out;
+       if (unlikely(vma->vm_start > address)) {
+               if (!(vma->vm_flags & VM_GROWSDOWN))
+                       goto out;
+               if (expand_stack(vma, address))
+                       goto out;
+       }
+
+       if (!write_access) {
+               /* page not present, check vm flags */
+               if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
+                       goto out;
+       } else {
+               if (!(vma->vm_flags & VM_WRITE))
+                       goto out;
+       }
+
+survive:
+       switch (handle_mm_fault(mm, vma, address, write_access)) {
+       case VM_FAULT_MINOR:
+               current->min_flt++;
+               break;
+       case VM_FAULT_MAJOR:
+               current->maj_flt++;
+               break;
+       case VM_FAULT_SIGBUS:
+               goto out_sigbus;
+       case VM_FAULT_OOM:
+               goto out_of_memory;
+       default:
+               BUG();
+       }
+       ret = 0;
+out:
+       up_read(&mm->mmap_sem);
+       return ret;
+
+out_of_memory:
+       up_read(&mm->mmap_sem);
+       if (current->pid == 1) {
+               yield();
+               goto survive;
+       }
+       printk("VM: killing process %s\n", current->comm);
+       return ret;
+
+out_sigbus:
+       up_read(&mm->mmap_sem);
+       current->thread.prot_addr = address;
+       current->thread.trap_no = 0x11;
+       force_sig(SIGBUS, current);
+       return ret;
+}
+
+static inline size_t __user_copy_pt(unsigned long uaddr, void *kptr,
+                                   size_t n, int write_user)
+{
+       struct mm_struct *mm = current->mm;
+       unsigned long offset, pfn, done, size;
+       pgd_t *pgd;
+       pmd_t *pmd;
+       pte_t *pte;
+       void *from, *to;
+
+       done = 0;
+retry:
+       spin_lock(&mm->page_table_lock);
+       do {
+               pgd = pgd_offset(mm, uaddr);
+               if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
+                       goto fault;
+
+               pmd = pmd_offset(pgd, uaddr);
+               if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
+                       goto fault;
+
+               pte = pte_offset_map(pmd, uaddr);
+               if (!pte || !pte_present(*pte) ||
+                   (write_user && !pte_write(*pte)))
+                       goto fault;
+
+               pfn = pte_pfn(*pte);
+               if (!pfn_valid(pfn))
+                       goto out;
+
+               offset = uaddr & (PAGE_SIZE - 1);
+               size = min(n - done, PAGE_SIZE - offset);
+               if (write_user) {
+                       to = (void *)((pfn << PAGE_SHIFT) + offset);
+                       from = kptr + done;
+               } else {
+                       from = (void *)((pfn << PAGE_SHIFT) + offset);
+                       to = kptr + done;
+               }
+               memcpy(to, from, size);
+               done += size;
+               uaddr += size;
+       } while (done < n);
+out:
+       spin_unlock(&mm->page_table_lock);
+       return n - done;
+fault:
+       spin_unlock(&mm->page_table_lock);
+       if (__handle_fault(mm, uaddr, write_user))
+               return n - done;
+       goto retry;
+}
+
+size_t copy_from_user_pt(size_t n, const void __user *from, void *to)
+{
+       size_t rc;
+
+       if (segment_eq(get_fs(), KERNEL_DS)) {
+               memcpy(to, (void __kernel __force *) from, n);
+               return 0;
+       }
+       rc = __user_copy_pt((unsigned long) from, to, n, 0);
+       if (unlikely(rc))
+               memset(to + n - rc, 0, rc);
+       return rc;
+}
+
+size_t copy_to_user_pt(size_t n, void __user *to, const void *from)
+{
+       if (segment_eq(get_fs(), KERNEL_DS)) {
+               memcpy((void __kernel __force *) to, from, n);
+               return 0;
+       }
+       return __user_copy_pt((unsigned long) to, (void *) from, n, 1);
+}
index f44f0078b354538d86908b949e4d6f4a4cee8d7e..2d549ed2e11399dfe17975fcae72aa512b9f52fe 100644 (file)
@@ -28,6 +28,9 @@
 #define SLR    "slgr"
 #endif
 
+extern size_t copy_from_user_pt(size_t n, const void __user *from, void *to);
+extern size_t copy_to_user_pt(size_t n, void __user *to, const void *from);
+
 size_t copy_from_user_std(size_t size, const void __user *ptr, void *x)
 {
        unsigned long tmp1, tmp2;
@@ -69,34 +72,11 @@ size_t copy_from_user_std(size_t size, const void __user *ptr, void *x)
        return size;
 }
 
-size_t copy_from_user_std_small(size_t size, const void __user *ptr, void *x)
+size_t copy_from_user_std_check(size_t size, const void __user *ptr, void *x)
 {
-       unsigned long tmp1, tmp2;
-
-       tmp1 = 0UL;
-       asm volatile(
-               "0: mvcp  0(%0,%2),0(%1),%3\n"
-               "  "SLR"  %0,%0\n"
-               "   j     5f\n"
-               "1: la    %4,255(%1)\n" /* %4 = ptr + 255 */
-               "  "LHI"  %3,-4096\n"
-               "   nr    %4,%3\n"      /* %4 = (ptr + 255) & -4096 */
-               "  "SLR"  %4,%1\n"
-               "  "CLR"  %0,%4\n"      /* copy crosses next page boundary? */
-               "   jnh   5f\n"
-               "2: mvcp  0(%4,%2),0(%1),%3\n"
-               "  "SLR"  %0,%4\n"
-               "  "ALR"  %2,%4\n"
-               "3:"LHI"  %4,-1\n"
-               "  "ALR"  %4,%0\n"      /* copy remaining size, subtract 1 */
-               "   bras  %3,4f\n"
-               "   xc    0(1,%2),0(%2)\n"
-               "4: ex    %4,0(%3)\n"
-               "5:\n"
-               EX_TABLE(0b,1b) EX_TABLE(2b,3b)
-               : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
-               : : "cc", "memory");
-       return size;
+       if (size <= 1024)
+               return copy_from_user_std(size, ptr, x);
+       return copy_from_user_pt(size, ptr, x);
 }
 
 size_t copy_to_user_std(size_t size, void __user *ptr, const void *x)
@@ -130,28 +110,11 @@ size_t copy_to_user_std(size_t size, void __user *ptr, const void *x)
        return size;
 }
 
-size_t copy_to_user_std_small(size_t size, void __user *ptr, const void *x)
+size_t copy_to_user_std_check(size_t size, void __user *ptr, const void *x)
 {
-       unsigned long tmp1, tmp2;
-
-       tmp1 = 0UL;
-       asm volatile(
-               "0: mvcs  0(%0,%1),0(%2),%3\n"
-               "  "SLR"  %0,%0\n"
-               "   j     3f\n"
-               "1: la    %4,255(%1)\n" /* ptr + 255 */
-               "  "LHI"  %3,-4096\n"
-               "   nr    %4,%3\n"      /* (ptr + 255) & -4096UL */
-               "  "SLR"  %4,%1\n"
-               "  "CLR"  %0,%4\n"      /* copy crosses next page boundary? */
-               "   jnh   3f\n"
-               "2: mvcs  0(%4,%1),0(%2),%3\n"
-               "  "SLR"  %0,%4\n"
-               "3:\n"
-               EX_TABLE(0b,1b) EX_TABLE(2b,3b)
-               : "+a" (size), "+a" (ptr), "+a" (x), "+a" (tmp1), "=a" (tmp2)
-               : : "cc", "memory");
-       return size;
+       if (size <= 1024)
+               return copy_to_user_std(size, ptr, x);
+       return copy_to_user_pt(size, ptr, x);
 }
 
 size_t copy_in_user_std(size_t size, void __user *to, const void __user *from)
@@ -343,10 +306,10 @@ int futex_atomic_cmpxchg(int __user *uaddr, int oldval, int newval)
 }
 
 struct uaccess_ops uaccess_std = {
-       .copy_from_user = copy_from_user_std,
-       .copy_from_user_small = copy_from_user_std_small,
-       .copy_to_user = copy_to_user_std,
-       .copy_to_user_small = copy_to_user_std_small,
+       .copy_from_user = copy_from_user_std_check,
+       .copy_from_user_small = copy_from_user_std,
+       .copy_to_user = copy_to_user_std_check,
+       .copy_to_user_small = copy_to_user_std,
        .copy_in_user = copy_in_user_std,
        .clear_user = clear_user_std,
        .strnlen_user = strnlen_user_std,