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-rw-r--r--mm/madvise.c26
1 files changed, 23 insertions, 3 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index b9ce574827c..76eb4193acd 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -123,8 +123,7 @@ static long madvise_willneed(struct vm_area_struct * vma,
end = vma->vm_end;
end = ((end - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
- force_page_cache_readahead(file->f_mapping,
- file, start, max_sane_readahead(end - start));
+ force_page_cache_readahead(file->f_mapping, file, start, end - start);
return 0;
}
@@ -239,12 +238,30 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
break;
default:
- error = -EINVAL;
+ BUG();
break;
}
return error;
}
+static int
+madvise_behavior_valid(int behavior)
+{
+ switch (behavior) {
+ case MADV_DOFORK:
+ case MADV_DONTFORK:
+ case MADV_NORMAL:
+ case MADV_SEQUENTIAL:
+ case MADV_RANDOM:
+ case MADV_REMOVE:
+ case MADV_WILLNEED:
+ case MADV_DONTNEED:
+ return 1;
+
+ default:
+ return 0;
+ }
+}
/*
* The madvise(2) system call.
*
@@ -290,6 +307,9 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
int write;
size_t len;
+ if (!madvise_behavior_valid(behavior))
+ return error;
+
write = madvise_need_mmap_write(behavior);
if (write)
down_write(&current->mm->mmap_sem);