On Wed, Mar 25, 2020 at 05:12:45PM +0100, glider@xxxxxxxxxx wrote: > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index a8560052a915f..63dc1a594964a 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -367,6 +367,7 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, > &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); > return DMA_MAPPING_ERROR; > } > + kmsan_handle_dma(page_address(page) + offset, size, dir); This needs to go into dma_map_page so that it also covers IOMMUs. dma_map_sg_atttrs will also need similar treatment. Also the page doesn't have to be mapped into kernel address space, you probably want to pass the page to kmsan_handle_dma and throw in a highmem check there.
