Received: by 2002:a25:6193:0:0:0:0:0 with SMTP id v141csp774273ybb; Sat, 28 Mar 2020 09:45:11 -0700 (PDT) X-Google-Smtp-Source: ADFU+vtWP2a5ZUq+odfSx1qgHNWUze4elzPg95uJABIfHxDCbRk/BB4pr1vxh3Xp+qUTzP0QeEUS X-Received: by 2002:a9d:4b98:: with SMTP id k24mr3141494otf.26.1585413911227; Sat, 28 Mar 2020 09:45:11 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1585413911; cv=none; d=google.com; s=arc-20160816; b=WzIxYfM7JekSZD22HiYDR6aWRRMcox5mK7oKwyJp39aA4I7ArNCKTXqGC8zUd/gYYu rCnDZAsip2wnC23r8LEOQa0rgXyJJm/EMBefU+TXFXcWP8yx9FRu40gV+42+vNteodGW K42AJn75dLlcZTrOqeMSOimxvG/oLYYyfQZihbdsV5g8HAwD0OvghPRgfTUjGADvGjUM tKmx73ySE/0V+qRRryZd46MDEnWhcNg7lfX/+TT4uXoT+Z2MHclzL8kgYH5Eh4Ns58ko MdKATXEV1iRjhKQREA87mzEEOJXxxy7SFEz1Zp9cLqo4+prA+0M7+jQ1fh4hg2jk45Tr Hwzg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:subject:date:from:message-id; bh=9h4f3RjbYgDLqsICUDAfz1o9QnJBFt9QJTFbquFW63o=; b=wuRIQt6RQknOhYdJ1gfKC6Y22940moDMzQMnZbOCUe/emsQWBHr0yfByhFRbOLSJHY U+mNZuVYoAanhBwLtULEET0OahlwF4VmBqDutXikun2EJRmlixNPK8bf8HYlzrwtyixD pWYsNU/lc3rB9W8m2K2tzkeJ3Ks0p7glN5eJsFU+XdpGr/3ctChcmVQdaYyREPicn13m wJLbBHHv9DBXgfV4glcvYSgK8AV0rUQuQM2BmDBGyyw6vriO7lhwZSGpD4tlGNi0+m2e i+slO2zJ89it4NDzmGBZzlM6Xfh6eQuJlDRQmOnEoUmoFfiaABhlZEUhycJSiEhnnSpO dcvg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h59si3829154oth.233.2020.03.28.09.44.58; Sat, 28 Mar 2020 09:45:11 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728004AbgC1QoR (ORCPT + 99 others); Sat, 28 Mar 2020 12:44:17 -0400 Received: from mx.sdf.org ([205.166.94.20]:49799 "EHLO mx.sdf.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728002AbgC1QoR (ORCPT ); Sat, 28 Mar 2020 12:44:17 -0400 Received: from sdf.org (IDENT:lkml@sdf.lonestar.org [205.166.94.16]) by mx.sdf.org (8.15.2/8.14.5) with ESMTPS id 02SGhGqn011685 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits) verified NO); Sat, 28 Mar 2020 16:43:17 GMT Received: (from lkml@localhost) by sdf.org (8.15.2/8.12.8/Submit) id 02SGhG7f004946; Sat, 28 Mar 2020 16:43:16 GMT Message-Id: <202003281643.02SGhG7f004946@sdf.org> From: George Spelvin Date: Wed, 27 Mar 2019 08:27:16 -0400 Subject: [RFC PATCH v1 25/50] HID: hid-lg: We only need pseudorandom bytes for the address To: linux-kernel@vger.kernel.org, lkml@sdf.org Cc: Simon Wood , Hans de Goede , Jiri Kosina , Benjamin Tissoires Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's just to reduce collisions among cooperating USB HID devices; it's not intended to be secure against a malicious attacker (and it would need to be a lot larger than 16 bits if it were). Signed-off-by: George Spelvin Cc: Simon Wood Cc: Hans de Goede Cc: Jiri Kosina Cc: Benjamin Tissoires --- drivers/hid/hid-lg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c index 0dc7cdfc56f77..b6b6ed9834c7c 100644 --- a/drivers/hid/hid-lg.c +++ b/drivers/hid/hid-lg.c @@ -832,7 +832,7 @@ static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id) /* Select random Address */ buf[1] = 0xB2; - get_random_bytes(&buf[2], 2); + prandom_bytes(buf+2, 2); ret = hid_hw_raw_request(hdev, buf[0], buf, sizeof(cbuf), HID_FEATURE_REPORT, HID_REQ_SET_REPORT); -- 2.26.0