linux-kernel - [PATCH mm 1/2] kasan: don't use read-only static keys

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Date:   Wed,  9 Dec 2020 19:24:15 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH mm 1/2] kasan: don't use read-only static keys

__ro_after_init static keys are incompatible with usage in loadable kernel
modules and cause crashes. Don't use those, use normal static keys.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

---

This fix can be squashed into
"kasan: add and integrate kasan boot parameters".

---
 mm/kasan/hw_tags.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
index c91f2c06ecb5..55bd6f09c70f 100644
--- a/mm/kasan/hw_tags.c
+++ b/mm/kasan/hw_tags.c
@@ -43,11 +43,11 @@ static enum kasan_arg_stacktrace kasan_arg_stacktrace __ro_after_init;
 static enum kasan_arg_fault kasan_arg_fault __ro_after_init;
 
 /* Whether KASAN is enabled at all. */
-DEFINE_STATIC_KEY_FALSE_RO(kasan_flag_enabled);
+DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled);
 EXPORT_SYMBOL(kasan_flag_enabled);
 
 /* Whether to collect alloc/free stack traces. */
-DEFINE_STATIC_KEY_FALSE_RO(kasan_flag_stacktrace);
+DEFINE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
 
 /* Whether panic or disable tag checking on fault. */
 bool kasan_flag_panic __ro_after_init;
-- 
2.29.2.576.ga3fc446d84-goog