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Fix get_unmapped_area sanity tests

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As noted by Chris Wright, we need to do the full range of tests regardless
of whether MAP_FIXED is set or not, so re-organize get_unmapped_area()
slightly to do the sanity checks unconditionally.
This commit is contained in:
Linus Torvalds
2005-05-19 22:43:37 -07:00
parent 66e60f9251
commit 07ab67c8d0
2 changed files with 34 additions and 29 deletions
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59
mm/mmap.c
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@@ -1302,37 +1302,40 @@ unsigned long
get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
if (flags & MAP_FIXED) {
unsigned long ret;
unsigned long ret;
if (addr > TASK_SIZE - len)
return -ENOMEM;
if (addr & ~PAGE_MASK)
return -EINVAL;
if (file && is_file_hugepages(file)) {
/*
* Check if the given range is hugepage aligned, and
* can be made suitable for hugepages.
*/
ret = prepare_hugepage_range(addr, len);
} else {
/*
* Ensure that a normal request is not falling in a
* reserved hugepage range. For some archs like IA-64,
* there is a separate region for hugepages.
*/
ret = is_hugepage_only_range(current->mm, addr, len);
}
if (ret)
return -EINVAL;
return addr;
if (!(flags & MAP_FIXED)) {
unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
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;
addr = get_area(file, addr, len, pgoff, flags);
if (IS_ERR_VALUE(addr))
return addr;
}
if (file && file->f_op && file->f_op->get_unmapped_area)
return file->f_op->get_unmapped_area(file, addr, len,
pgoff, flags);
return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
if (addr > TASK_SIZE - len)
return -ENOMEM;
if (addr & ~PAGE_MASK)
return -EINVAL;
if (file && is_file_hugepages(file)) {
/*
* Check if the given range is hugepage aligned, and
* can be made suitable for hugepages.
*/
ret = prepare_hugepage_range(addr, len);
} else {
/*
* Ensure that a normal request is not falling in a
* reserved hugepage range. For some archs like IA-64,
* there is a separate region for hugepages.
*/
ret = is_hugepage_only_range(current->mm, addr, len);
}
if (ret)
return -EINVAL;
return addr;
}
EXPORT_SYMBOL(get_unmapped_area);