The access should fail, but it shouldn't oops.
Reported-by: Sasha Levin <[email protected]>
Signed-off-by: Andy Lutomirski <[email protected]>
---
This applies to tip/x86/vdso and should be applied to unbreak Trinity
on linux-next.
arch/x86/vdso/vma.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c
index e915eae..d02131e 100644
--- a/arch/x86/vdso/vma.c
+++ b/arch/x86/vdso/vma.c
@@ -84,6 +84,8 @@ static unsigned long vdso_addr(unsigned long start, unsigned
len)
return addr;
}
+static struct page *no_pages[] = {NULL};
+
static int map_vdso(const struct vdso_image *image, bool calculate_addr)
{
struct mm_struct *mm = current->mm;
@@ -125,7 +127,7 @@ static int map_vdso(const struct vdso_image *image, bool
calculate_addr)
addr + image->size,
image->sym_end_mapping - image->size,
VM_READ,
- NULL);
+ no_pages);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
--
1.9.0
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