#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
-#include <linux/ptrace.h>
+#include <linux/tracehook.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/mount.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
+#include "internal.h"
+
void *high_memory;
struct page *mem_map;
unsigned long max_mapnr;
i_size_write(inode, offset);
out_truncate:
- if (inode->i_op && inode->i_op->truncate)
+ if (inode->i_op->truncate)
inode->i_op->truncate(inode);
return 0;
out_sig:
unsigned int kobjsize(const void *objp)
{
struct page *page;
- int order = 0;
/*
* If the object we have should not have ksize performed on it,
* return size of 0
*/
- if (!objp)
- return 0;
-
- if ((unsigned long)objp >= memory_end)
+ if (!objp || !virt_addr_valid(objp))
return 0;
page = virt_to_head_page(objp);
- if (!page)
- return 0;
/*
* If the allocator sets PageSlab, we know the pointer came from
/*
* The ksize() function is only guaranteed to work for pointers
- * returned by kmalloc(). So handle arbitrary pointers, that we expect
- * always to be compound pages, here.
- */
- if (PageCompound(page))
- order = compound_order(page);
-
- /*
- * Finally, handle arbitrary pointers that don't set PageSlab.
- * Default to 0-order in the case when we're unable to ksize()
- * the object.
+ * returned by kmalloc(). So handle arbitrary pointers here.
*/
- return PAGE_SIZE << order;
+ return PAGE_SIZE << compound_order(page);
}
-/*
- * get a list of pages in an address range belonging to the specified process
- * and indicate the VMA that covers each page
- * - this is potentially dodgy as we may end incrementing the page count of a
- * slab page or a secondary page from a compound page
- * - don't permit access to VMAs that don't support it, such as I/O mappings
- */
-int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long start, int len, int write, int force,
- struct page **pages, struct vm_area_struct **vmas)
+int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, int len, int flags,
+ struct page **pages, struct vm_area_struct **vmas)
{
struct vm_area_struct *vma;
unsigned long vm_flags;
int i;
+ int write = !!(flags & GUP_FLAGS_WRITE);
+ int force = !!(flags & GUP_FLAGS_FORCE);
+ int ignore = !!(flags & GUP_FLAGS_IGNORE_VMA_PERMISSIONS);
/* calculate required read or write permissions.
* - if 'force' is set, we only require the "MAY" flags.
/* protect what we can, including chardevs */
if (vma->vm_flags & (VM_IO | VM_PFNMAP) ||
- !(vm_flags & vma->vm_flags))
+ (!ignore && !(vm_flags & vma->vm_flags)))
goto finish_or_fault;
if (pages) {
finish_or_fault:
return i ? : -EFAULT;
}
+
+
+/*
+ * get a list of pages in an address range belonging to the specified process
+ * and indicate the VMA that covers each page
+ * - this is potentially dodgy as we may end incrementing the page count of a
+ * slab page or a secondary page from a compound page
+ * - don't permit access to VMAs that don't support it, such as I/O mappings
+ */
+int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, int len, int write, int force,
+ struct page **pages, struct vm_area_struct **vmas)
+{
+ int flags = 0;
+
+ if (write)
+ flags |= GUP_FLAGS_WRITE;
+ if (force)
+ flags |= GUP_FLAGS_FORCE;
+
+ return __get_user_pages(tsk, mm,
+ start, len, flags,
+ pages, vmas);
+}
EXPORT_SYMBOL(get_user_pages);
DEFINE_RWLOCK(vmlist_lock);
}
EXPORT_SYMBOL(vmalloc_node);
+#ifndef PAGE_KERNEL_EXEC
+# define PAGE_KERNEL_EXEC PAGE_KERNEL
+#endif
+
+/**
+ * vmalloc_exec - allocate virtually contiguous, executable memory
+ * @size: allocation size
+ *
+ * Kernel-internal function to allocate enough pages to cover @size
+ * the page level allocator and map them into contiguous and
+ * executable kernel virtual space.
+ *
+ * For tight control over page level allocator and protection flags
+ * use __vmalloc() instead.
+ */
+
+void *vmalloc_exec(unsigned long size)
+{
+ return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC);
+}
+
/**
* vmalloc_32 - allocate virtually contiguous memory (32bit addressable)
* @size: allocation size
* it's being traced - otherwise breakpoints set in it may interfere
* with another untraced process
*/
- if ((flags & MAP_PRIVATE) && (current->ptrace & PT_PTRACED))
+ if ((flags & MAP_PRIVATE) && tracehook_expect_breakpoints(current))
vm_flags &= ~VM_MAYSHARE;
return vm_flags;
/* Don't let a single process grow too big:
leave 3% of the size of this process for other processes */
- allowed -= current->mm->total_vm / 32;
+ if (mm)
+ allowed -= mm->total_vm / 32;
/*
* cast `allowed' as a signed long because vm_committed_space
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff