The patch titled
Subject: mm/vmalloc: fix size check for remap_vmalloc_range_partial()
has been added to the -mm tree. Its filename is
mm-vmalloc-fix-size-check-for-remap_vmalloc_range_partial.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmalloc-fix-size-check-for-remap_vmalloc_range_partial.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmalloc-fix-size-check-for-remap_vmalloc_range_partial.patch
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------------------------------------------------------
From: Roman Penyaev <rpenyaev@xxxxxxx>
Subject: mm/vmalloc: fix size check for remap_vmalloc_range_partial()
area->size can include adjacent guard page but get_vm_area_size() returns
actual size of the area.
This fixes possible kernel crash when userspace tries to map area on 1
page bigger: size check passes but the following vmalloc_to_page() returns
NULL on last guard (non-existing) page.
Link: http://lkml.kernel.org/r/20190103145954.16942-2-rpenyaev@xxxxxxx
Signed-off-by: Roman Penyaev <rpenyaev@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/vmalloc.c~mm-vmalloc-fix-size-check-for-remap_vmalloc_range_partial
+++ a/mm/vmalloc.c
@@ -2248,7 +2248,7 @@ int remap_vmalloc_range_partial(struct v
if (!(area->flags & VM_USERMAP))
return -EINVAL;
- if (kaddr + size > area->addr + area->size)
+ if (kaddr + size > area->addr + get_vm_area_size(area))
return -EINVAL;
do {
_
Patches currently in -mm which might be from rpenyaev@xxxxxxx are
epoll-make-sure-all-elements-in-ready-list-are-in-fifo-order.patch
epoll-loosen-irq-safety-in-ep_poll_callback.patch
epoll-unify-awaking-of-wakeup-source-on-ep_poll_callback-path.patch
epoll-use-rwlock-in-order-to-reduce-ep_poll_callback-contention.patch
mm-vmalloc-fix-size-check-for-remap_vmalloc_range_partial.patch
mm-vmalloc-do-not-call-kmemleak_free-on-not-yet-accounted-memory.patch
mm-vmalloc-pass-vm_usermap-flags-directly-to-__vmalloc_node_range.patch
