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When converted to (u64) for page calculations, a negative offset can produce extremely large page indices. This may lead to issues in certain advice modes (excessive readahead or cache invalidation). Reject negative offsets with -EINVAL for consistent argument validation and to avoid silent misbehavior. POSIX and the man page do not clearly define behavior for negative offset/len. FreeBSD rejects negative offsets as well, so failing with -EINVAL is consistent with existing practice. The man page can be updated separately to document the Linux behavior. Link: https://lkml.kernel.org/r/20260208135738.18992-1-klourencodev@gmail.com Link: https://lkml.kernel.org/r/20251222141817.13335-1-klourencodev@gmail.com Signed-off-by: Kevin Lourenco <k.lourenco@criteo.com> Acked-by: David Hildenbrand (Arm) <david@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: "Liam R. Howlett" <Liam.Howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
224 lines
5.5 KiB
224 lines
5.5 KiB