From: Roman Penyaev <rpenyaev@suse.de>
To: unlisted-recipients:; (no To-header on input)
Cc: Roman Penyaev <rpenyaev@suse.de>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@suse.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Joe Perches <joe@perches.com>,
"Luis R. Rodriguez" <mcgrof@kernel.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org
Subject: [PATCH 1/3] mm/vmalloc: fix size check for remap_vmalloc_range_partial()
Date: Thu, 3 Jan 2019 15:59:52 +0100 [thread overview]
Message-ID: <20190103145954.16942-2-rpenyaev@suse.de> (raw)
In-Reply-To: <20190103145954.16942-1-rpenyaev@suse.de>
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.
Signed-off-by: Roman Penyaev <rpenyaev@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Joe Perches <joe@perches.com>
Cc: "Luis R. Rodriguez" <mcgrof@kernel.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
---
mm/vmalloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 871e41c55e23..2cd24186ba84 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2248,7 +2248,7 @@ int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
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 {
--
2.19.1
next prev parent reply other threads:[~2019-01-03 15:00 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-03 14:59 [PATCH 0/3] mm/vmalloc: fix size check and few cleanups Roman Penyaev
2019-01-03 14:59 ` Roman Penyaev [this message]
2019-01-03 15:13 ` [PATCH 1/3] mm/vmalloc: fix size check for remap_vmalloc_range_partial() Michal Hocko
2019-01-03 19:27 ` Roman Penyaev
2019-01-03 19:40 ` Michal Hocko
2019-01-03 20:31 ` Roman Penyaev
2019-01-04 9:38 ` Michal Hocko
2019-01-04 10:21 ` Roman Penyaev
2019-01-04 10:28 ` Michal Hocko
2019-01-03 19:59 ` Michal Hocko
2019-01-04 11:06 ` Roman Penyaev
2019-01-11 19:19 ` Andrey Ryabinin
2019-01-03 14:59 ` [PATCH 2/3] mm/vmalloc: do not call kmemleak_free() on not yet accounted memory Roman Penyaev
2019-01-11 19:26 ` Andrey Ryabinin
2019-01-12 17:19 ` Roman Penyaev
2019-01-03 14:59 ` [PATCH 3/3] mm/vmalloc: pass VM_USERMAP flags directly to __vmalloc_node_range() Roman Penyaev
2019-01-03 15:23 ` Michal Hocko
2019-01-11 19:19 ` Andrey Ryabinin
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