The patch titled
Subject: mm/memremap.c: add a bounds check in devm_memremap_pages()
has been added to the -mm tree. Its filename is
mm-add-a-bounds-check-in-devm_memremap_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-a-bounds-check-in-devm_memremap_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-a-bounds-check-in-devm_memremap_pages.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alastair D'Silva <alastair@xxxxxxxxxxx>
Subject: mm/memremap.c: add a bounds check in devm_memremap_pages()
The call to check_hotplug_memory_addressable() validates that the memory
is fully addressable.
Without this call, it is possible that we may remap pages that is not
physically addressable, resulting in bogus section numbers being returned
from __section_nr().
Link: http://lkml.kernel.org/r/20190917010752.28395-3-alastair@xxxxxxxxxxx
Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxxx>
Cc: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Wei Yang <richard.weiyang@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memremap.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/mm/memremap.c~mm-add-a-bounds-check-in-devm_memremap_pages
+++ a/mm/memremap.c
@@ -195,6 +195,11 @@ void *devm_memremap_pages(struct device
int error, nid, is_ram;
bool need_devmap_managed = true;
+ error = check_hotplug_memory_addressable(res->start,
+ resource_size(res));
+ if (error)
+ return ERR_PTR(error);
+
switch (pgmap->type) {
case MEMORY_DEVICE_PRIVATE:
if (!IS_ENABLED(CONFIG_DEVICE_PRIVATE)) {
_
Patches currently in -mm which might be from alastair@xxxxxxxxxxx are
memory_hotplug-add-a-bounds-check-to-check_hotplug_memory_range.patch
mm-add-a-bounds-check-in-devm_memremap_pages.patch
mm-dont-manually-decrement-num_poisoned_pages.patch
mm-remove-null-check-in-clear_hwpoisoned_pages.patch
