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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-19 22:43:37 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-19 22:43:37 -0700
commit07ab67c8d0d7c1021343b7d5c045033d6bf7be69 (patch)
tree5857098ebbb760afc8b0d722f119e06b3d1f6511 /mm
parent66e60f92518268f4d2a702a1c4ffbe1caacd6290 (diff)
downloadop-kernel-dev-07ab67c8d0d7c1021343b7d5c045033d6bf7be69.zip
op-kernel-dev-07ab67c8d0d7c1021343b7d5c045033d6bf7be69.tar.gz
Fix get_unmapped_area sanity tests
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.
Diffstat (limited to 'mm')
-rw-r--r--mm/mmap.c59
1 files changed, 31 insertions, 28 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 63df2d6..de54acd 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -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);
- if (file && file->f_op && file->f_op->get_unmapped_area)
- return file->f_op->get_unmapped_area(file, addr, len,
- pgoff, flags);
+ 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;
+ }
- 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);
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