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[ Upstream commit bf6ab33d8487f5e2a0998ce75286eae65bb0a6d6 ] When called with a 'from' that is not 4-byte-aligned, string_memcpy_fromio() calls the movs() macro to copy the first few bytes, so that 'from' becomes 4-byte-aligned before calling rep_movs(). This movs() macro modifies 'to', and the subsequent line modifies 'n'. As a result, on unaligned accesses, kmsan_unpoison_memory() uses the updated (aligned) values of 'to' and 'n'. Hence, it does not unpoison the entire region. Save the original values of 'to' and 'n', and pass those to kmsan_unpoison_memory(), so that the entire region is unpoisoned. Signed-off-by: Brian Johannesmeyer <bjohannesmeyer@gmail.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Alexander Potapenko <glider@google.com> Link: https://lore.kernel.org/r/20240523215029.4160518-1-bjohannesmeyer@gmail.com Signed-off-by: Sasha Levin <sashal@kernel.org>