The patch titled
Subject: mm/gup_benchmark.c: prevent integer overflow in ioctl
has been removed from the -mm tree. Its filename was
mm-gup_benchmark-prevent-integer-overflow-in-ioctl.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Subject: mm/gup_benchmark.c: prevent integer overflow in ioctl
The concern here is that "gup->size" is a u64 and "nr_pages" is unsigned
long. On 32 bit systems we could trick the kernel into allocating fewer
pages than expected.
Link: http://lkml.kernel.org/r/20181025061546.hnhkv33diogf2uis@kili.mountain
Fixes: 64c349f4ae78 ("mm: add infrastructure for get_user_pages_fast() benchmarking")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Keith Busch <keith.busch@xxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: YueHaibing <yuehaibing@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup_benchmark.c | 3 +++
1 file changed, 3 insertions(+)
--- a/mm/gup_benchmark.c~mm-gup_benchmark-prevent-integer-overflow-in-ioctl
+++ a/mm/gup_benchmark.c
@@ -27,6 +27,9 @@ static int __gup_benchmark_ioctl(unsigne
int nr;
struct page **pages;
+ if (gup->size > ULONG_MAX)
+ return -EINVAL;
+
nr_pages = gup->size / PAGE_SIZE;
pages = kvcalloc(nr_pages, sizeof(void *), GFP_KERNEL);
if (!pages)
_
Patches currently in -mm which might be from dan.carpenter@xxxxxxxxxx are
