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s390/uv: fully validate the VMA before calling follow_page()
[ Upstream commit46c22ffd27
] We should not walk/touch page tables outside of VMA boundaries when holding only the mmap sem in read mode. Evil user space can modify the VMA layout just before this function runs and e.g., trigger races with page table removal code since commitdd2283f260
("mm: mmap: zap pages with read mmap_sem in munmap"). find_vma() does not check if the address is >= the VMA start address; use vma_lookup() instead. Fixes:214d9bbcd3
("s390/mm: provide memory management functions for protected KVM guests") Signed-off-by: David Hildenbrand <david@redhat.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com> Link: https://lore.kernel.org/r/20210909162248.14969-6-david@redhat.com Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -212,7 +212,7 @@ int gmap_make_secure(struct gmap *gmap, unsigned long gaddr, void *uvcb)
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uaddr = __gmap_translate(gmap, gaddr);
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if (IS_ERR_VALUE(uaddr))
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goto out;
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vma = find_vma(gmap->mm, uaddr);
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vma = vma_lookup(gmap->mm, uaddr);
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if (!vma)
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goto out;
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/*
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