From nobody Tue Oct 7 08:38:16 2025 Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id CDB931F4282; Fri, 11 Jul 2025 10:25:31 +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=1752229536; cv=none; b=AHe/+zzphUeJsm70ckq8h6QNCa952gBj+rS3Ubxezg78aOfD4rR1F3QcXr0oz6RSP8c/bw87y8vdkq6TOua8M3Za13N4ny2t8XRm2P2Hq1L0FbeTrBbjuGloKpzvgr0vxm8uuLfgtWmZ79WlAjKoeYmKtUCVqZZeaA7gP+t8BYY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752229536; c=relaxed/simple; bh=vKJvOURhUE13DR5vB8HI3FuVcBQKiAi/1A/TkD7JfWI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=JZmiEFZanf7heAb7WQRgDvXDUOOFAz1XyX4fXWTtVWsdq0EkXmeR1K+++6vu/jD8iG9SEl9ifNDzp7YVJQw8QR2M6VRvULbFS0Evnfd/+AMh3oMGgY5TJehBlvQQsidA+TmcM/nqj9mLAEJUZ8YBsTGDuLtOQjUcmxSLpDpXUQM= 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 [223.64.68.193]) by gateway (Coremail) with SMTP id _____8Bx22qT5nBosysnAQ--.48018S3; Fri, 11 Jul 2025 18:25:23 +0800 (CST) Received: from localhost.localdomain (unknown [223.64.68.193]) by front1 (Coremail) with SMTP id qMiowJDxscKH5nBoupkSAA--.12437S2; Fri, 11 Jul 2025 18:25:21 +0800 (CST) From: Huacai Chen To: Huacai Chen , Andrew Morton Cc: linux-mm@kvack.org, Alexander Viro , Christian Brauner , Jan Kara , linux-kernel@vger.kernel.org, Huacai Chen , stable@vger.kernel.org Subject: [PATCH] init: Handle bootloader head in kernel parameters Date: Fri, 11 Jul 2025 18:24:55 +0800 Message-ID: <20250711102455.3673865-1-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.47.1 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: qMiowJDxscKH5nBoupkSAA--.12437S2 X-CM-SenderInfo: hfkh0x5xdftxo6or00hjvr0hdfq/ X-Coremail-Antispam: 1Uk129KBj93XoW7Kr1xCrWxCF48ZF1DuFy3Awc_yoW8XF4DpF 4qvry3X3s7Jr4Svw48ZrWvg34fuwnxWa12kanruan8JF15Wry0qas5CFZxW3Zxtr4fKF4j qF1kXF10k3W7AFXCm3ZEXasCq-sJn29KB7ZKAUJUUUUr529EdanIXcx71UUUUU7KY7ZEXa sCq-sGcSsGvfJ3Ic02F40EFcxC0VAKzVAqx4xG6I80ebIjqfuFe4nvWSU5nxnvy29KBjDU 0xBIdaVrnRJUUUvKb4IE77IF4wAFF20E14v26r1j6r4UM7CY07I20VC2zVCF04k26cxKx2 IYs7xG6rWj6s0DM7CIcVAFz4kK6r1Y6r17M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48v e4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI 0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_ GcCE3s1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEncxIr21l57IF6xkI12xvs2 x26I8E6xACxx1l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1Y6r17 McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr4 1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1l4IxYO2xFxVAFwI0_Jrv_ JF1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17 CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0 I7IYx2IY6xkF7I0E14v26r1j6r4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I 8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r1j6r4UYxBIdaVFxhVjvjDU 0xZFpf9x07jepB-UUUUU= Content-Type: text/plain; charset="utf-8" BootLoader may pass a head such as "BOOT_IMAGE=3D/boot/vmlinuz-x.y.z" to kernel parameters. But this head is not recognized by the kernel so will be passed to user space. However, user space init program also doesn't recognized it. KEXEC may also pass a head such as "kexec" on some architectures. So the the best way is handle it by the kernel itself, which can avoid such boot warnings: Kernel command line: BOOT_IMAGE=3D(hd0,1)/vmlinuz-6.x root=3D/dev/sda3 ro c= onsole=3Dtty Unknown kernel command line parameters "BOOT_IMAGE=3D(hd0,1)/vmlinuz-6.x", = will be passed to user space. Cc: stable@vger.kernel.org Signed-off-by: Huacai Chen --- init/main.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/init/main.c b/init/main.c index 225a58279acd..9e0a7e8913c0 100644 --- a/init/main.c +++ b/init/main.c @@ -545,6 +545,7 @@ static int __init unknown_bootoption(char *param, char = *val, const char *unused, void *arg) { size_t len =3D strlen(param); + const char *bootloader[] =3D { "BOOT_IMAGE", "kexec", NULL }; =20 /* Handle params aliased to sysctls */ if (sysctl_is_alias(param)) @@ -552,6 +553,12 @@ static int __init unknown_bootoption(char *param, char= *val, =20 repair_env_string(param, val); =20 + /* Handle bootloader head */ + for (int i =3D 0; bootloader[i]; i++) { + if (!strncmp(param, bootloader[i], strlen(bootloader[i]))) + return 0; + } + /* Handle obsolete-style parameters */ if (obsolete_checksetup(param)) return 0; --=20 2.47.1