From 76e278d6b50534092038d4117d7a2687af034107 Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Thu, 4 Jun 2020 16:46:08 -0700 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. Signed-off-by: Andrey Konovalov Signed-off-by: Andrew Morton Reviewed-by: Dmitry Vyukov Cc: Alan Stern Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Greg Kroah-Hartman Cc: Marco Elver Link: http://lkml.kernel.org/r/4520671eeb604adbc2432c248b0c07fbaa5519ef.1585233617.git.andreyknvl@google.com Link: http://lkml.kernel.org/r/2821d497ac1cdc0efb5e00df30271e4a67fc8009.1584655448.git.andreyknvl@google.com Signed-off-by: Linus Torvalds --- drivers/usb/core/hcd.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'drivers/usb/core/hcd.c') 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 #include #include +#include #include #include @@ -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); -- cgit