[merged mm-nonmm-stable] kcov-use-write_once-for-selftest-mode-stores.patch removed from -mm tree

[merged mm-nonmm-stable] kcov-use-write_once-for-selftest-mode-stores.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: kcov: use WRITE_ONCE() for selftest mode stores
has been removed from the -mm tree.  Its filename was
     kcov-use-write_once-for-selftest-mode-stores.patch

This patch was dropped because it was merged into the mm-nonmm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Karl Mehltretter <kmehltretter@gmail.com>
Subject: kcov: use WRITE_ONCE() for selftest mode stores
Date: Tue, 26 May 2026 13:47:15 +0200

The KCOV selftest enables coverage by setting current->kcov_mode to
KCOV_MODE_TRACE_PC without installing a coverage area.  If an interrupt
records coverage in that window, the access should fault and expose the
bug.

When building for QEMU raspi0 (Raspberry Pi Zero, ARMv6, CONFIG_CPU_V6K=y,
CONFIG_CURRENT_POINTER_IN_TPIDRURO=y) with GCC 13.3.0, the store that
enables the mode is removed.  The generated kcov_init() code only stores
zero after the wait loop:

  mrc	15, 0, r3, cr13, cr0, {3}
  str	r4, [r3, #2028]

where r4 is zero.  There is no store of KCOV_MODE_TRACE_PC before the
loop, so the selftest reports success without exercising coverage.

Use WRITE_ONCE() for the temporary mode stores.  With the same compiler
and config, kcov_init() contains the intended mode store:

  mov	r3, #2
  mrc	15, 0, r2, cr13, cr0, {3}
  str	r3, [r2, #2028]

Now that the KCOV selftest is actually executed, it may expose KCOV
instrumentation issues depending on the kernel config.  That is expected
for a selftest that was intended to catch coverage from interrupt paths.

Link: https://lore.kernel.org/20260526114715.38280-1-kmehltretter@gmail.com
Fixes: 6cd0dd934b03 ("kcov: Add interrupt handling self test")
Assisted-by: Codex:gpt-5
Signed-off-by: Karl Mehltretter <kmehltretter@gmail.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Kees Cook <kees@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/kcov.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/kcov.c~kcov-use-write_once-for-selftest-mode-stores
+++ a/kernel/kcov.c
@@ -1119,10 +1119,10 @@ static void __init selftest(void)
 	 * potentially traced functions in this region.
 	 */
 	start = jiffies;
-	current->kcov_mode = KCOV_MODE_TRACE_PC;
+	WRITE_ONCE(current->kcov_mode, KCOV_MODE_TRACE_PC);
 	while ((jiffies - start) * MSEC_PER_SEC / HZ < 300)
 		;
-	current->kcov_mode = 0;
+	WRITE_ONCE(current->kcov_mode, 0);
 	pr_err("done running self test\n");
 }
 #endif
_

Patches currently in -mm which might be from kmehltretter@gmail.com are