The patch titled
Subject: kcov: properly check for softirq context
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
kcov-properly-check-for-softirq-context.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/kcov-properly-check-for-softirq-context.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Subject: kcov: properly check for softirq context
Date: Mon, 29 Jul 2024 04:21:58 +0200
When collecting coverage from softirqs, KCOV uses in_serving_softirq() to
check whether the code is running in the softirq context. Unfortunately,
in_serving_softirq() is > 0 even when the code is running in the hardirq
or NMI context for hardirqs and NMIs that happened during a softirq.
As a result, if a softirq handler contains a remote coverage collection
section and a hardirq with another remote coverage collection section
happens during handling the softirq, KCOV incorrectly detects a nested
softirq coverate collection section and prints a WARNING, as reported by
syzbot.
This issue was exposed by commit a7f3813e589f ("usb: gadget: dummy_hcd:
Switch to hrtimer transfer scheduler"), which switched dummy_hcd to using
hrtimer and made the timer's callback be executed in the hardirq context.
Change the related checks in KCOV to account for this behavior of
in_serving_softirq() and make KCOV ignore remote coverage collection
sections in the hardirq and NMI contexts.
This prevents the WARNING printed by syzbot but does not fix the inability
of KCOV to collect coverage from the __usb_hcd_giveback_urb when dummy_hcd
is in use (caused by a7f3813e589f); a separate patch is required for that.
Link: https://lkml.kernel.org/r/20240729022158.92059-1-andrey.konovalov@xxxxxxxxx
Fixes: 5ff3b30ab57d ("kcov: collect coverage from interrupts")
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxx>
Reported-by: syzbot+2388cdaeb6b10f0c13ac@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=2388cdaeb6b10f0c13ac
Acked-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Aleksandr Nogikh <nogikh@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Marcello Sylvester Bauer <sylv@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/kcov.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
--- a/kernel/kcov.c~kcov-properly-check-for-softirq-context
+++ a/kernel/kcov.c
@@ -161,6 +161,15 @@ static void kcov_remote_area_put(struct
kmsan_unpoison_memory(&area->list, sizeof(area->list));
}
+/*
+ * Unlike in_serving_softirq(), this function returns false when called during
+ * a hardirq or an NMI that happened in the softirq context.
+ */
+static inline bool in_softirq_really(void)
+{
+ return in_serving_softirq() && !in_hardirq() && !in_nmi();
+}
+
static notrace bool check_kcov_mode(enum kcov_mode needed_mode, struct task_struct *t)
{
unsigned int mode;
@@ -170,7 +179,7 @@ static notrace bool check_kcov_mode(enum
* so we ignore code executed in interrupts, unless we are in a remote
* coverage collection section in a softirq.
*/
- if (!in_task() && !(in_serving_softirq() && t->kcov_softirq))
+ if (!in_task() && !(in_softirq_really() && t->kcov_softirq))
return false;
mode = READ_ONCE(t->kcov_mode);
/*
@@ -849,7 +858,7 @@ void kcov_remote_start(u64 handle)
if (WARN_ON(!kcov_check_handle(handle, true, true, true)))
return;
- if (!in_task() && !in_serving_softirq())
+ if (!in_task() && !in_softirq_really())
return;
local_lock_irqsave(&kcov_percpu_data.lock, flags);
@@ -991,7 +1000,7 @@ void kcov_remote_stop(void)
int sequence;
unsigned long flags;
- if (!in_task() && !in_serving_softirq())
+ if (!in_task() && !in_softirq_really())
return;
local_lock_irqsave(&kcov_percpu_data.lock, flags);
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxx are
kcov-properly-check-for-softirq-context.patch
kcov-dont-instrument-lib-find_bitc.patch
