From nobody Mon Jun 15 09:44:43 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 405813803CF; Thu, 9 Apr 2026 12:24:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=114.242.206.163 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775737461; cv=none; b=vC0EnfUkM7EyggCMnJLYQl4lR5fmysXVcsj8oV6t2hVRp1Dsm5Rw6IiK/cquNgk4NhCnG1kKBAPY3OxIVFTCXbo/QCLXz3H2Yge9Rb2hQmqowfHifQV3dSQGpAaz/CYLYjvVmPA76nBCyuzc58KGZqtv9GWVKf0q5sgifa8G9gw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775737461; c=relaxed/simple; bh=HNKw14P66FJvMNLzibCqRaymfR78xd/McgonVN6rCLM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=BoaKWYDZLCNtSwymjz2Mp5gI4BCD8x4tZkp7/4TnDO1Mc4LkR/783NAxT8xQtWoYt1ZuDirvRzlHPZjr9B7vCX7mpdKRSXO3OylLK7DRk5T1UBrJZi+6Od7BK6Cjf4F8oqATMZDMP+S+xKQo6LglTimr6m9aXRnUwW8SAxf987k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn; spf=pass smtp.mailfrom=loongson.cn; arc=none smtp.client-ip=114.242.206.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=loongson.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=loongson.cn Received: from loongson.cn (unknown [223.64.68.17]) by gateway (Coremail) with SMTP id _____8DxL6pnmtdp_osjAA--.39574S3; Thu, 09 Apr 2026 20:24:07 +0800 (CST) Received: from kernelserver (unknown [223.64.68.17]) by front1 (Coremail) with SMTP id qMiowJBxxuJdmtdpXX9pAA--.46632S2; Thu, 09 Apr 2026 20:24:03 +0800 (CST) From: Huacai Chen To: Huacai Chen Cc: loongarch@lists.linux.dev, Xuefeng Li , Guo Ren , Xuerui Wang , Jiaxun Yang , linux-kernel@vger.kernel.org, Huacai Chen , stable@vger.kernel.org Subject: [PATCH] LoongArch: Show CPU vulnerabilites correctly Date: Thu, 9 Apr 2026 20:23:48 +0800 Message-ID: <20260409122348.2438400-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.52.0 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 X-CM-TRANSID: qMiowJBxxuJdmtdpXX9pAA--.46632S2 X-CM-SenderInfo: hfkh0x5xdftxo6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj9xXoWrKryrZr4DWry7Ary3Cw13ZFc_yoWkCFb_u3 ZIqrW5Gr4xA3Wqq3Z0vrsYqrnIyw48KF9Y9r92yw47Aw17J34UXr4S9w15Arn3KF10grZx J34vqa1qvF13tosvyTuYvTs0mTUanT9S1TB71UUUUUDqnTZGkaVYY2UrUUUUj1kv1TuYvT s0mT0YCTnIWjqI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUI cSsGvfJTRUUUb7AYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20x vaj40_Wr0E3s1l1IIY67AEw4v_Jrv_JF1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWUCVW8JwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8JVWxJwA2z4x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6r4UJVWxJr1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqjxCEc2xF0cIa020Ex4CE44I27w Aqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E2Ix0cI8IcVAFwI0_Jrv_JF1lYx0Ex4A2jsIE 14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwCF04k20xvY0x 0EwIxGrwCFx2IqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E 7480Y4vE14v26r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcV C0I7IYx2IY67AKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Jr0_Gr1lIxAIcVCF 04k26cxKx2IYs7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7 CjxVAFwI0_Jr0_GrUvcSsGvfC2KfnxnUUI43ZEXa7IU8zwZ7UUUUU== Content-Type: text/plain; charset="utf-8" Most LoongArch processors are vulnerable to Spectre-V1 Proof-of-Concept (PoC). And the generic mechanism, __user pointer sanitization, can be used as a mitigation. This means to use array_index_nospec() to prevent out of boundry access in syscall and other critical paths. Implement the arch-specific cpu_show_spectre_v1() to show CPU Spectre-V1 vulnerabilites correctly. Cc: stable@vger.kernel.org Link: https://cc-sw.com/chinese-loongarch-architecture-evaluation-part-3-of= -3/ Signed-off-by: Huacai Chen --- arch/loongarch/kernel/cpu-probe.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-= probe.c index 8654a1eff834..c8947c798195 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -402,3 +402,9 @@ void cpu_probe(void) =20 cpu_report(); } + +ssize_t cpu_show_spectre_v1(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "Mitigation: __user pointer sanitization\n"); +} --=20 2.52.0