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@xxxxxxxxxx>
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
those callbacks, which is used to facilitate coverage-guided fuzzing with
syzkaller.
Link: http://lkml.kernel.org/r/32bce32c8b88c2f88cd0a8acfcdb5d3a6e894632.1583778264.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
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@xxxxxxxxxx are
kcov-cleanup-debug-messages.patch
kcov-collect-coverage-from-interrupts.patch
usb-core-kcov-collect-coverage-from-usb-complete-callback.patch
