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Change History

In the Linux kernel, the following vulnerability has been resolved:

arm64: mte: Do not warn if the page is already tagged in copy_highpage()

The arm64 copy_highpage() assumes that the destination page is newly
allocated and not MTE-tagged (PG_mte_tagged unset) and warns
accordingly. However, following commit 060913999d7a ("mm: migrate:
support poisoned recover from migrate folio"), folio_mc_copy() is called
before __folio_migrate_mapping(). If the latter fails (-EAGAIN), the
copy will be done again to the same destination page. Since
copy_highpage() already set the PG_mte_tagged flag, this second copy
will warn.

Replace the WARN_ON_ONCE(page already tagged) in the arm64
copy_highpage() with a comment.

https://git.kernel.org/stable/c/0bbf3fc6e9211fce9889fe8efbb89c220504d617

https://git.kernel.org/stable/c/5ff5765a1fc526f07d3bbaedb061d970eb13bcf4

https://git.kernel.org/stable/c/b98c94eed4a975e0c80b7e90a649a46967376f58