Messages in this thread Patch in this message | | | From | Matthew Wilcox <> | Subject | [PATCH] mm: Prevent mapping slab pages to userspace | Date | Fri, 25 Jan 2019 09:38:27 -0800 |
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It's never appropriate to map a page allocated by SLAB into userspace. A buggy device driver might try this, or an attacker might be able to find a way to make it happen.
Signed-off-by: Matthew Wilcox <willy@infradead.org> --- mm/memory.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/memory.c b/mm/memory.c index e11ca9dd823f..ce8c90b752be 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1451,7 +1451,7 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr, spinlock_t *ptl; retval = -EINVAL; - if (PageAnon(page)) + if (PageAnon(page) || PageSlab(page)) goto out; retval = -ENOMEM; flush_dcache_page(page); -- 2.20.1
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