Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:[EOL][EOL]arm64: mte: Do not warn if the page is already tagged in copy_highpage()[EOL][EOL]The arm64 copy_highpage() assumes that the destination page is newly[EOL]allocated and not MTE-tagged (PG_mte_tagged unset) and warns[EOL]accordingly. However, following commit 060913999d7a ("mm: migrate:[EOL]support poisoned recover from migrate folio"), folio_mc_copy() is called[EOL]before __folio_migrate_mapping(). If the latter fails (-EAGAIN), the[EOL]copy will be done again to the same destination page. Since[EOL]copy_highpage() already set the PG_mte_tagged flag, this second copy[EOL]will warn.[EOL][EOL]Replace the WARN_ON_ONCE(page already tagged) in the arm64[EOL]copy_highpage() with a comment.