kmsan: handle memory sent to/from USB

Depending on the value of is_out kmsan_handle_urb() KMSAN either marks the
data copied to the kernel from a USB device as initialized, or checks the
data sent to the device for being initialized.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Alexander Potapenko <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Andrey Konovalov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vasily Gorbik <[email protected]>
Cc: Vegard Nossum <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/kmsan.h b/include/linux/kmsan.h
index dac296da45c5..c473e0e21683 100644
--- a/include/linux/kmsan.h
+++ b/include/linux/kmsan.h
@@ -18,6 +18,7 @@ struct page;
 struct kmem_cache;
 struct task_struct;
 struct scatterlist;
+struct urb;
 
 #ifdef CONFIG_KMSAN
 
@@ -203,6 +204,16 @@ void kmsan_handle_dma(struct page *page, size_t offset, size_t size,
 void kmsan_handle_dma_sg(struct scatterlist *sg, int nents,
 			 enum dma_data_direction dir);
 
+/**
+ * kmsan_handle_urb() - Handle a USB data transfer.
+ * @urb:    struct urb pointer.
+ * @is_out: data transfer direction (true means output to hardware).
+ *
+ * If @is_out is true, KMSAN checks the transfer buffer of @urb. Otherwise,
+ * KMSAN initializes the transfer buffer.
+ */
+void kmsan_handle_urb(const struct urb *urb, bool is_out);
+
 #else
 
 static inline void kmsan_init_shadow(void)
@@ -295,6 +306,10 @@ static inline void kmsan_handle_dma_sg(struct scatterlist *sg, int nents,
 {
 }
 
+static inline void kmsan_handle_urb(const struct urb *urb, bool is_out)
+{
+}
+
 #endif
 
 #endif /* _LINUX_KMSAN_H */