From nobody Wed Dec 24 01:54:30 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A07565BA7; Mon, 29 Jan 2024 14:16:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706537775; cv=none; b=szYmyWjnoX6mnH66i78LPa270Z6hho4t2nHRDyyJAQvqUBwwhJTqfrfVhZ5Ux794HmuYQKdwsOWxbGPyskgUKmsaDROCxGMjms3NrnjQS6lT8xlNwEO2yXLweK3w/+wN8NByeZuaEkDM+fpK+GoVvM+pYkXem+vrvCIBucsC53A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706537775; c=relaxed/simple; bh=GrmuLwJa+BiBDhS1HgVuwxQ+fKStrHIgXIe12Tm1gcU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=IGUz6Yzcx117YTMmdGY/zDTUkqhjqPzkuKE6eYJ0phg6x1Om/EXdc8MMy2FEg7WF/wyMYalOZ5Fv0ShC8Qdvn9R2Qypo01DWsNY0odWPfJ8wSkUAEO2axwBtVwF0c+85skKE/6TfjI4haiWsTSzDQi9IOIt9xCseL3MJBruYbGo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 42891C433C7; Mon, 29 Jan 2024 14:16:11 +0000 (UTC) From: Huacai Chen To: Huacai Chen , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko Cc: loongarch@lists.linux.dev, Xuerui Wang , Jiaxun Yang , Dmitry Vyukov , Vincenzo Frascino , Qing Zhang , kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, loongson-kernel@lists.loongnix.cn, Huacai Chen Subject: [PATCH] LoongArch: Fix earlycon parameter if KASAN enabled Date: Mon, 29 Jan 2024 22:15:50 +0800 Message-Id: <20240129141550.3284498-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.39.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The earlycon parameter is based on fixmap, and fixmap addresses are not supposed to be shadowed by KASAN. So return the kasan_early_shadow_page in kasan_mem_to_shadow() if the input address is above FIXADDR_START. Otherwise earlycon cannot work after kasan_init(). Signed-off-by: Huacai Chen --- arch/loongarch/mm/kasan_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c index cc3e81fe0186..c608adc99845 100644 --- a/arch/loongarch/mm/kasan_init.c +++ b/arch/loongarch/mm/kasan_init.c @@ -44,6 +44,9 @@ void *kasan_mem_to_shadow(const void *addr) unsigned long xrange =3D (maddr >> XRANGE_SHIFT) & 0xffff; unsigned long offset =3D 0; =20 + if (maddr >=3D FIXADDR_START) + return (void *)(kasan_early_shadow_page); + maddr &=3D XRANGE_SHADOW_MASK; switch (xrange) { case XKPRANGE_CC_SEG: --=20 2.39.3