From nobody Sun Jun 14 14:31:21 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (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 6C6DF18DB01 for ; Fri, 3 Apr 2026 04:07:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775189235; cv=none; b=k3XFu9rT9VgQJ3a2Fkb8SAZtYD42HPac/psrBLnmJpr45oYjYVrG+7rCd/2aKD9dB9fM8kh7vkWvLazfLtMw4YRrBO1NpVWde2lagNed8EM+OZ0cST15BINne4cPGYof4509yz6v24VqKSsJJ8FbqIFg4NMoIKwgK3W4ehFPvD8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775189235; c=relaxed/simple; bh=3JhiPDwldW0WsrXzZHM+bR8hU4tBSwqmUE7kwoHnoM0=; h=From:Date:Message-ID:To:Cc:Subject; b=gJk4S8MnUgffvn7RunI1Dqpgj6c+9Yut68Uq7LFDTLaEtxGcEaiTHVkf6RT6pMyTcj1xSZJ3tY6P+MGFAYLDesXWq6CeSj/GXTI7lv2yTtolHYELimY9Yu/Wi9Yf1KfwrB9PfMducHQ7tvnEtk+w29H3SrTgokxc5UqWiINjuX8= 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=159.226.251.25 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-arm-compressed.eml (unknown [111.196.245.197]) by APP-05 (Coremail) with SMTP id zQCowAC3Sw_tPM9pFk1XDA--.12296S2; Fri, 03 Apr 2026 12:07:09 +0800 (CST) From: Pengpeng Hou Date: Fri, 3 Apr 2026 11:55:40 +0800 Message-ID: <20260403143002.2-arm-compressed-memtype-pengpeng@iscas.ac.cn> To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, pengpeng@iscas.ac.cn Subject: [PATCH] ARM: compressed: validate memory node device_type strings X-CM-TRANSID: zQCowAC3Sw_tPM9pFk1XDA--.12296S2 X-Coremail-Antispam: 1UD129KBjvJXoWxJr4rZr43CFWrXF4UKw4xXrb_yoW8Gryrpr WUGr9Iqa18Wr1Iv3y7Wrn8W348twsYkrW5Jr90kF1UK3Wag34FqFWftFy3Jw1DC3yrC3sx AF1rXFyDW3WfKaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUya14x267AKxVWUJVW8JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s 0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xII jxv20xvE14v26r106r15McIj6I8E87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr 1lF7xvr2IY64vIr41lF7I21c0EjII2zVCS5cI20VAGYxC7MxAIw28IcxkI7VAKI48JMxC2 0s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI 0_JrI_JrWlx4CE17CEb7AF67AKxVWUXVWUAwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE 14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20x vaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8 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" fdt_check_mem_start() walks memory nodes in the compressed-kernel early FDT and fetches device_type directly with fdt_getprop() before immediately comparing it with strcmp(). Raw FDT properties are external boot input, and this path does not prove that device_type is NUL-terminated within its declared bounds. Use fdt_stringlist_get() so malformed unterminated device_type properties are rejected before they are used as C strings. Signed-off-by: Pengpeng Hou --- arch/arm/boot/compressed/fdt_check_mem_start.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/compressed/fdt_check_mem_start.c b/arch/arm/boot= /compressed/fdt_check_mem_start.c index aa856567fd33..7c433ef33bcb 100644 --- a/arch/arm/boot/compressed/fdt_check_mem_start.c +++ b/arch/arm/boot/compressed/fdt_check_mem_start.c @@ -106,7 +106,7 @@ uint32_t fdt_check_mem_start(uint32_t mem_start, const = void *fdt) /* Walk all memory nodes and regions */ for (offset =3D fdt_next_node(fdt, -1, NULL); offset >=3D 0; offset =3D fdt_next_node(fdt, offset, NULL)) { - type =3D fdt_getprop(fdt, offset, "device_type", NULL); + type =3D fdt_stringlist_get(fdt, offset, "device_type", 0, NULL); if (!type || strcmp(type, "memory")) continue; =20 --=20 2.50.1 (Apple Git-155)