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mm/memory.c: prevent mapping typed pages to userspace

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Pages which use page_type must never be mapped to userspace as it would
destroy their page type.  Add an explicit check for this instead of
assuming that kernel drivers always get this right.

Link: http://lkml.kernel.org/r/20190129053830.3749-1-willy@infradead.org
Signed-off-by: Matthew Wilcox <willy@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2019-03-05 15:46:06 -08:00 committed by Linus Torvalds
parent 2d432cb709
commit 0ee930e6ca
1 changed files with 1 additions and 1 deletions
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mm/memory.c
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@ -1452,7 +1452,7 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
spinlock_t *ptl;
retval = -EINVAL;
if (PageAnon(page) || PageSlab(page))
if (PageAnon(page) || PageSlab(page) || page_has_type(page))
goto out;
retval = -ENOMEM;
flush_dcache_page(page);