From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AE1013E898 for ; Thu, 26 Jun 2025 02:49:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750906153; cv=none; b=Pyj9bGwBnq9chq9yz3LH1Ajz+waM5zvoX6VpU7sy2kXR2X8BUMo1hBDhKw8Dm+vpLLdQCWBV65VY/kHALSZsiEL+KopsluXK1qfAzFna8pJ8MbNDRT81Bo9JLbDd6kGvf/Lc6LyjyDUJn+WHEw/djTY5Hgk1xYOl1IECHlxCuVg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750906153; c=relaxed/simple; bh=sAot5RFGE+3bsQ7+ya5wx8AdzVCdPYrxYWRz8ze1kZE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=hXXQ47IvjgOEDIsuD5CkgUw4KfpdvWrFfuIu5yuUTRFLJ0J5kjKzSqtDTud1w3pEe8zYLkhwO+fU9a3rb360aaCvh1XGnoTtZjzoyjTjygsIGdh5OWp3DWAqMsFmbTeM/sVkslamc+jl0V1CB2WzFe/GpStSJpoO/ChwJpGSl/s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f200.google.com with SMTP id e9e14a558f8ab-3ddd03db21cso7591885ab.1 for ; Wed, 25 Jun 2025 19:49:10 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750906149; x=1751510949; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=yMeeKMzugMr6rAfraHsP1/mGrgQjCmrbV88/rg/kWgY=; b=dC6OvFZOqZKHqKMfQFOddrhmqIhjmL0k2tgN0N4uJgwXoG0YEf4POcJQ/dq5Vp7RTx CV6cjrrmiV/1C/qOUwtH4fsVX9+6WMJqR9F6KfmtcI67+9Um8XKs+VWIZqfFPXgeT1DR L5z/01YiPSOiXcFssolGizx9/ytsh3ipPLOI+3p3yJIbhh0B+YO4mQwhdOJbWeMis1E/ Gx7npvy/ubapG5jQvyA6TgQyW4w5DW2CveedTrqUx/tzuqG5GX691klTl2VS0bB1Ge3R eMeoe/Dn2jw5aHP0GUTXj9tWfPjk0IZvpHDYII7MCJ8Gg6ulEF5jptjn7ofN+6rtNH3F RzHg== X-Gm-Message-State: AOJu0YyR4hGMrJbi+3eQ7l/lOPI/mHzPwhGAttIMAbc87RznuBCyxByp ZgnkjHUwz1MzHpXusYFS2ZKCQ2HZ9TyOfXHI8jwuSNF5F24VWKcG52mEnDLPcClD6KweR/P3Ap8 jtAgs9mZEQip3WT4O8Tn+7jbZIpwoz3K4fgkQsVEfyFlxmlWAuE5Z/2H1alU= X-Google-Smtp-Source: AGHT+IGHRDhY0n97IhOZUCUG7ARaUOHMeL09bUf8UYYbgykpPJYzmS2zRSZ64NezxSWpqtDhUkB3AQU3ajeuCGMloXLjmjWm0ybS Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:248a:b0:3dd:ce9b:aa17 with SMTP id e9e14a558f8ab-3df3292bebfmr76374115ab.20.1750906149592; Wed, 25 Jun 2025 19:49:09 -0700 (PDT) Date: Wed, 25 Jun 2025 19:49:09 -0700 In-Reply-To: <6854a3e6.a00a0220.137b3.0022.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <685cb525.050a0220.2303ee.0101.GAE@google.com> Subject: Re: [syzbot] Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3) From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [kernel?] KMSAN: kernel-infoleak in vmci_host_unlocked_ioctl (3) Author: lizhi.xu@windriver.com #syz test diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c index b64944367ac5..2d7a828749d0 100644 --- a/drivers/misc/vmw_vmci/vmci_host.c +++ b/drivers/misc/vmw_vmci/vmci_host.c @@ -91,7 +91,7 @@ struct vmci_host_dev { static struct vmci_ctx *host_context; static bool vmci_host_device_initialized; static atomic_t vmci_host_active_users = ATOMIC_INIT(0); - +static atomic_t vmci_host_dev_open = ATOMIC_INIT(0); /* * Determines whether the VMCI host personality is * available. Since the core functionality of the host driver is @@ -120,6 +120,11 @@ static int vmci_host_open(struct inode *inode, struct file *filp) { struct vmci_host_dev *vmci_host_dev; + if (atomic_inc_return(&vmci_host_dev_open) > 1) { + atomic_dec(&vmci_host_dev_open); + return -EBUSY; + } + vmci_host_dev = kzalloc(sizeof(struct vmci_host_dev), GFP_KERNEL); if (vmci_host_dev == NULL) return -ENOMEM; @@ -155,6 +160,7 @@ static int vmci_host_close(struct inode *inode, struct file *filp) kfree(vmci_host_dev); filp->private_data = NULL; + atomic_dec(&vmci_host_dev_open); return 0; }