+ usb-core-kcov-collect-coverage-from-usb-complete-callback.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: usb: core: kcov: collect coverage from usb complete callback
has been added to the -mm tree.  Its filename is
     usb-core-kcov-collect-coverage-from-usb-complete-callback.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/usb-core-kcov-collect-coverage-from-usb-complete-callback.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/usb-core-kcov-collect-coverage-from-usb-complete-callback.patch

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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: usb: core: kcov: collect coverage from usb complete callback

This patch adds kcov_remote_start/stop() callbacks around the urb
complete() callback that is executed in softirq context when dummy_hcd is
in use.  As the result, kcov can be used to collect coverage from those
callbacks, which is used to facilitate coverage-guided fuzzing with
syzkaller.

Link: http://lkml.kernel.org/r/2821d497ac1cdc0efb5e00df30271e4a67fc8009.1584655448.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/usb/core/hcd.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/usb/core/hcd.c~usb-core-kcov-collect-coverage-from-usb-complete-callback
+++ a/drivers/usb/core/hcd.c
@@ -31,6 +31,7 @@
 #include <linux/types.h>
 #include <linux/genalloc.h>
 #include <linux/io.h>
+#include <linux/kcov.h>
 
 #include <linux/phy/phy.h>
 #include <linux/usb.h>
@@ -1645,7 +1646,9 @@ static void __usb_hcd_giveback_urb(struc
 
 	/* pass ownership to the completion handler */
 	urb->status = status;
+	kcov_remote_start_usb((u64)urb->dev->bus->busnum);
 	urb->complete(urb);
+	kcov_remote_stop();
 
 	usb_anchor_resume_wakeups(anchor);
 	atomic_dec(&urb->use_count);
_

Patches currently in -mm which might be from andreyknvl@google.com are

kcov-cleanup-debug-messages.patch
kcov-collect-coverage-from-interrupts.patch
usb-core-kcov-collect-coverage-from-usb-complete-callback.patch