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Code Issues Releases Wiki Activity

Take arch_mmap_check() into get_unmapped_area() 

Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-12-03 15:23:11 -05:00
parent 8c7b49b3ec
commit 9206de95b1
2 changed files with 12 additions and 17 deletions
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14
mm/mmap.c
View File

@ -931,13 +931,9 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
if (!(flags & MAP_FIXED))
addr = round_hint_to_min(addr);
error = arch_mmap_check(addr, len, flags);
if (error)
return error;
/* Careful about overflows.. */
len = PAGE_ALIGN(len);
if (!len || len > TASK_SIZE)
if (!len)
return -ENOMEM;
/* offset overflow? */
@ -1437,6 +1433,14 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long (*get_area)(struct file *, unsigned long,
unsigned long, unsigned long, unsigned long);
unsigned long error = arch_mmap_check(addr, len, flags);
if (error)
return error;
/* Careful about overflows.. */
if (len > TASK_SIZE)
return -ENOMEM;
get_area = current->mm->get_unmapped_area;
if (file && file->f_op && file->f_op->get_unmapped_area)
get_area = file->f_op->get_unmapped_area;

15
mm/mremap.c
View File

@ -27,10 +27,6 @@
#include "internal.h"
#ifndef arch_mmap_check
#define arch_mmap_check(addr, len, flags) (0)
#endif
static pmd_t *get_old_pmd(struct mm_struct *mm, unsigned long addr)
{
pgd_t *pgd;
@ -366,9 +362,7 @@ static unsigned long mremap_to(unsigned long addr,
map_flags = MAP_FIXED;
if (vma->vm_flags & VM_MAYSHARE)
map_flags |= MAP_SHARED;
ret = arch_mmap_check(new_addr, new_len, map_flags);
if (ret)
goto out1;
ret = get_unmapped_area(vma->vm_file, new_addr, new_len, vma->vm_pgoff +
((addr - vma->vm_start) >> PAGE_SHIFT),
map_flags);
@ -388,12 +382,9 @@ out:
static int vma_expandable(struct vm_area_struct *vma, unsigned long delta)
{
unsigned long end = vma->vm_end + delta;
unsigned long max_addr = TASK_SIZE;
if (vma->vm_next)
max_addr = vma->vm_next->vm_start;
if (max_addr < end || end < vma->vm_end)
if (end < vma->vm_end) /* overflow */
return 0;
if (arch_mmap_check(vma->vm_start, end - vma->vm_start, MAP_FIXED))
if (vma->vm_next && vma->vm_next->vm_start < end) /* intersection */
return 0;
if (get_unmapped_area(NULL, vma->vm_start, end - vma->vm_start,
0, MAP_FIXED) & ~PAGE_MASK)