From nobody Mon Jun 15 09:41:32 2026 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 592FD247291; Sat, 11 Apr 2026 02:05:42 +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=1775873146; cv=none; b=tgfkodaU1LRfb5dQF68zIYKoswemmBTVOmXndwCv0cEdwKpQ6mV56H+syw5fwza/F0s2WlfXr5VLkdqpP2zWZ94/B1+5nfuv4yYReeFV4kl61rmGoqlEuz34bTfjuaCQU+5ghePSmgqd0ZMzYGE2xHmYHpxtUh40BGugjjIBMJc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775873146; c=relaxed/simple; bh=A8T+0KyOzB5wMeVORzGGrHba9n+in8xjS4BOAhubVXk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Bg9T/5yd5r4fk22kc1nRgYtcmTAJyGy4kYDjCQuGyoWsZ+ts7+fEFSRQdQn3+fKNn6NFtBBlYrKCiH9dPeNmnv4arItvilwsHd6e/PrThIXdbsgCGoqF5LZWMiEPKAsG1MGmy2+rsbMQ7JOydG44h3fsDciFVKwmMJV1L4HtjIE= 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 _____8Cx_6pwrNlpLTYkAA--.1788S3; Sat, 11 Apr 2026 10:05:36 +0800 (CST) Received: from kernelserver (unknown [223.64.68.17]) by front1 (Coremail) with SMTP id qMiowJDxhcBprNlpZ8FqAA--.37055S2; Sat, 11 Apr 2026 10:05:32 +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 V2] LoongArch: Show CPU vulnerabilites correctly Date: Sat, 11 Apr 2026 10:05:22 +0800 Message-ID: <20260411020522.2779250-1-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: qMiowJDxhcBprNlpZ8FqAA--.37055S2 X-CM-SenderInfo: hfkh0x5xdftxo6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj93XoWxJr15JF1kZr1DCr1xAF4fZwc_yoW8WrWkpF Wqywn5Xr4rCF1DtasFvF129ryDX3WkGw13Wa4akFykAF12vr1DXr1v93yDXF1jvw47KayF gF98G3s3KFW7Z3cCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUvEb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Jr0_JF4l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Jr0_Gr1l84ACjcxK6I8E87Iv67AKxVWUJVW8JwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ Gr0_Gr1UM2kKe7AKxVWUXVWUAwAS0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYI kI8VC2zVCFFI0UMc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUXVWU AwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI4 8JMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E14v26r1Y 6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4CE17CEb7 AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r1j6r1xMIIF0xvE 2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20xvaj40_Jr0_JF4lIxAIcV C2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVWUJVW8JbIYCTnIWIevJa73 UjIFyTuYvjxU2MKZDUUUU 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 --- V2: Fix build warnings. 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 diff --git a/arch/loongarch/kernel/cpu-probe.c b/arch/loongarch/kernel/cpu-= probe.c index c8947c798195..52f36ef19897 100644 --- a/arch/loongarch/kernel/cpu-probe.c +++ b/arch/loongarch/kernel/cpu-probe.c @@ -7,6 +7,7 @@ #include #include #include +#include #include #include #include