The patch titled
Subject: mm/vmalloc.c:__vmalloc_area_node(): avoid 32-bit overflow
has been removed from the -mm tree. Its filename was
mm-vmallocc-__vmalloc_area_node-avoid-32-bit-overflow.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Subject: mm/vmalloc.c:__vmalloc_area_node(): avoid 32-bit overflow
With a machine with 3 TB (more than 2 TB memory). If you use vmalloc to
allocate > 2 TB memory, the array_size below will be overflowed.
The array_size is an unsigned int and can only be used to allocate less
than 2 TB memory. If you pass 2*1028*1028*1024*1024 = 2 * 2^40 in the
argument of vmalloc. The array_size will become 2*2^31 = 2^32. The 2^32
cannot be store with a 32 bit integer.
The fix is to change the type of array_size to unsigned long.
[akpm@xxxxxxxxxxxxxxxxxxxx: rework for current mainline]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=210023
Reported-by: <hsinhuiwu@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/mm/vmalloc.c~mm-vmallocc-__vmalloc_area_node-avoid-32-bit-overflow
+++ a/mm/vmalloc.c
@@ -2461,9 +2461,11 @@ static void *__vmalloc_area_node(struct
{
const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
unsigned int nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
- unsigned int array_size = nr_pages * sizeof(struct page *), i;
+ unsigned long array_size;
+ unsigned int i;
struct page **pages;
+ array_size = (unsigned long)nr_pages * sizeof(struct page *);
gfp_mask |= __GFP_NOWARN;
if (!(gfp_mask & (GFP_DMA | GFP_DMA32)))
gfp_mask |= __GFP_HIGHMEM;
_
Patches currently in -mm which might be from akpm@xxxxxxxxxxxxxxxxxxxx are
mm.patch
mm-fix-initialization-of-struct-page-for-holes-in-memory-layout-checkpatch-fixes.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings-fix-2.patch
lib-cmdline_kunit-add-a-new-test-suite-for-cmdline-api-fix.patch
ilog2-improve-ilog2-for-constant-arguments-checkpatch-fixes.patch
lib-test_bitmapc-add-for_each_set_clump-test-cases-checkpatch-fixes.patch
checkpatch-fix-typo_spelling-check-for-words-with-apostrophe-fix.patch
resource-fix-kernel-doc-markups-checkpatch-fixes.patch
lib-ubsanc-mark-type_check_kinds-with-static-keyword-fix.patch
linux-next-rejects.patch
kmap-stupid-hacks-to-make-it-compile.patch
epoll-wire-up-syscall-epoll_pwait2-fix.patch
set_memory-allow-set_direct_map__noflush-for-multiple-pages-fix.patch
arch-mm-wire-up-memfd_secret-system-call-were-relevant-fix.patch
kernel-forkc-export-kernel_thread-to-modules.patch
