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virtio: kmsan: check/unpoison scatterlist in vring_map_one_sg()
If vring doesn't use the DMA API, KMSAN is unable to tell whether the memory is initialized by hardware. Explicitly call kmsan_handle_dma() from vring_map_one_sg() in this case to prevent false positives. Link: https://lkml.kernel.org/r/20220915150417.722975-23-glider@google.com Signed-off-by: Alexander Potapenko <glider@google.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Andrey Konovalov <andreyknvl@google.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Eric Biggers <ebiggers@google.com> Cc: Eric Biggers <ebiggers@kernel.org> Cc: Eric Dumazet <edumazet@google.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Kees Cook <keescook@chromium.org> Cc: Marco Elver <elver@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Pekka Enberg <penberg@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vegard Nossum <vegard.nossum@oracle.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -11,6 +11,7 @@
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#include <linux/module.h>
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#include <linux/hrtimer.h>
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#include <linux/dma-mapping.h>
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#include <linux/kmsan.h>
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#include <linux/spinlock.h>
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#include <xen/xen.h>
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@ -352,8 +353,15 @@ static dma_addr_t vring_map_one_sg(const struct vring_virtqueue *vq,
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struct scatterlist *sg,
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enum dma_data_direction direction)
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{
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if (!vq->use_dma_api)
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if (!vq->use_dma_api) {
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/*
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* If DMA is not used, KMSAN doesn't know that the scatterlist
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* is initialized by the hardware. Explicitly check/unpoison it
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* depending on the direction.
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*/
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kmsan_handle_dma(sg_page(sg), sg->offset, sg->length, direction);
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return (dma_addr_t)sg_phys(sg);
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}
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/*
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* We can't use dma_map_sg, because we don't use scatterlists in
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