From nobody Sun Jun 14 14:34:18 2026 Received: from cstnet.cn (smtp81.cstnet.cn [159.226.251.81]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F08AD2D781E for ; Fri, 3 Apr 2026 05:50:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.81 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775195407; cv=none; b=Praun7SEpSojzoOcPccxY3yUpS5MAY9bPh/xDUpBUDrpNdYTq71UUuzRS4VdLVreGpIQAfjb6EbJQWPvC149Ow0MUHeZnIRAflg8Yn6Fea9WobGAV3kHxjKD8hsfLbc2UyyTVVwW9Ww5AftaRbAUTOi+hRWXjGi6TZLPSHZUNK8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775195407; c=relaxed/simple; bh=tfdmF4PBsuMNE2dbjqB+tkzF7aHaEOp/iUp+3Ur6LoU=; h=From:Date:Message-ID:To:Cc:Subject; b=f5z+vmiNSgEL3A0Sr1Lh3gP+W2w9KSPZIjMs36SuShcdXTvljZjuMquQV9eFUSaTAyuKjFCelwfAxTSxirsqejdVJT1VpHeeuQRwJcnAcnEOvKyYsWBrU+Pwch6rHjd0ZVOsD3+3MyUeNvwP5FlvstXIi/zEcKWBe5/SEUYu8Xg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from 0002-arc.eml (unknown [111.196.245.197]) by APP-03 (Coremail) with SMTP id rQCowAA3WuELVc9pL4m7DA--.13684S2; Fri, 03 Apr 2026 13:50:03 +0800 (CST) From: Pengpeng Hou Date: Fri, 3 Apr 2026 13:41:47 +0800 Message-ID: <20260403161002.2-arc-dt-cpumap-pengpeng@iscas.ac.cn> To: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org, linux-kernel@vger.kernel.org, pengpeng@iscas.ac.cn Subject: [PATCH] arc: validate DT CPU map strings before parsing them X-CM-TRANSID: rQCowAA3WuELVc9pL4m7DA--.13684S2 X-Coremail-Antispam: 1UD129KBjvJXoW7AFy3uryUtF1xWF47Cw1xZrb_yoW8Gr13pF Z09FyqqrZ0v3s7A34qyr1kua4Ykw1kJr129FWrGw47Zw47tryDXrZa9F1v9r1xArW09a4F kFZ8uF4qyr4UJaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUya14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s 0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xII jxv20xvE14v26r106r15McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr 1lF7xvr2IY64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxAIw28IcxkI7VAKI48JMxC2 0s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI 0_JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE 14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20x vaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Gr0_Cr1lIxAIcVC2z280aVCY1x0267AKxVW8 JVW8JrUvcSsGvfC2KfnxnUUI43ZEXa7VUbnmRUUUUUU== X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" arc_get_cpu_map() fetches the possible-cpus or present-cpus property from the flat DT and immediately passes the raw pointer to cpulist_parse(). That parser expects a NUL-terminated text buffer, but this path does not prove that the DT property is terminated within its declared bounds. Reject unterminated CPU-map properties before handing them to cpulist_parse(). Signed-off-by: Pengpeng Hou --- arch/arc/kernel/smp.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c index b2f2c59279a6..e0f8218e9172 100644 --- a/arch/arc/kernel/smp.c +++ b/arch/arc/kernel/smp.c @@ -22,6 +22,7 @@ #include #include #include +#include =20 #include #include @@ -43,11 +44,15 @@ static int __init arc_get_cpu_map(const char *name, str= uct cpumask *cpumask) { unsigned long dt_root =3D of_get_flat_dt_root(); const char *buf; + int len; =20 - buf =3D of_get_flat_dt_prop(dt_root, name, NULL); + buf =3D of_get_flat_dt_prop(dt_root, name, &len); if (!buf) return -EINVAL; =20 + if (!memchr(buf, '\0', len)) + return -EINVAL; + if (cpulist_parse(buf, cpumask)) return -EINVAL; =20 --=20 2.50.1 (Apple Git-155)