[PATCH v4 7/7] usb: core: kcov: collect coverage from usb complete callback
From: Andrey Konovalov <hidden>
Date: 2020-03-26 14:44:45
Also in:
lkml
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
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. Signed-off-by: Andrey Konovalov <redacted> --- drivers/usb/core/hcd.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index aa45840d8273..de624c47e190 100644
--- a/drivers/usb/core/hcd.c
+++ b/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(struct urb *urb) /* 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);
--
2.26.0.rc2.310.g2932bb562d-goog