From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/W9yesrhsncTPWp1i9RJF79EN97HystO+ThSnONm71WEZRu8VsDBOTtS5zKwDZUvSbFLbv ARC-Seal: i=1; a=rsa-sha256; t=1523021783; cv=none; d=google.com; s=arc-20160816; b=DWL64VKsrPXYNxhIL7sOJqT3Sr6lx1Vu6xVTznz8KF8C76IptsvOnyrU7kwm/cAaeh qC2MnT+5tz6sc+b2yZH5n5VbMlOzZCZXLhITQ5+izwm0R+6hNijgFFFDq+EDBG7eLMCF IqFJIDVT2JRCEAPfruNeKyDbb0oaOVsBqXAHX9Av5kyy1VpY0pg52QDdsv2PNKxjUkP5 +MGTiKR8TrP7ZNtP3KcT5W2EwEK0mq+l7s3faNz/91+DyWwm1/THAVgDKIoU42Qj7vsr gqTI7y/YohJPNQkGiUvEmVoRpPS6+OtB46Z2DadgVghNlcjYAAwN6p6H2TVzf51hwSsM 2BYg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=w1iYVj1Etf62Gi8gea55iBIu5UtUytzLwWWhlJ9+RVM=; b=URWDmUIlYMpb+4WfQBCqc84wTyjc5cFW8V/PUWHgRMxKZPZjU18a8qZtInnWtORvFh rle2H1KsaXQAetE8E7aQpDP5bA2ACuDLGwUWUPEd7zpjg+ctTOHSXGn4x+wiJ36TD9nP lO5pOXOk2PXpy8s4f/xnnUzXQiv3+2yAAX0GzRcHmeAFp8CnOgz98FbTKdN1T1zKi3Iz nLstPCmmzZmmos08TdWuZNzWYMaZ6xqevQSFcCp3ZStbZKOcnAUfFGNjIk+/TeSFRcMm sOeKvbdYx7Yxanm9yQcx4juq4+Vz3VKNq7FqJfnZngQCB1zmHGHxq16z20sjyTMBscZ/ aEIQ== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Frysinger Subject: [PATCH 4.9 089/102] vt: change SGR 21 to follow the standards Date: Fri, 6 Apr 2018 15:24:10 +0200 Message-Id: <20180406084344.041369255@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180406084331.507038179@linuxfoundation.org> References: <20180406084331.507038179@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1597003632944142177?= X-GMAIL-MSGID: =?utf-8?q?1597004089253003348?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mike Frysinger commit 65d9982d7e523a1a8e7c9af012da0d166f72fc56 upstream. ECMA-48 [1] (aka ISO 6429) has defined SGR 21 as "doubly underlined" since at least March 1984. The Linux kernel has treated it as SGR 22 "normal intensity" since it was added in Linux-0.96b in June 1992. Before that, it was simply ignored. Other terminal emulators have either ignored it, or treat it as double underline now. xterm for example added support in its 304 release (May 2014) [2] where it was previously ignoring it. Changing this behavior shouldn't be an issue: - It isn't a named capability in ncurses's terminfo database, so no script is using libtinfo/libcurses to look this up, or using tput to query & output the right sequence. - Any script assuming SGR 21 will reset intensity in all terminals already do not work correctly on non-Linux VTs (including running under screen/tmux/etc...). - If someone has written a script that only runs in the Linux VT, and they're using SGR 21 (instead of SGR 22), the output should still be readable. imo it's important to change this as the Linux VT's non-conformance is sometimes used as an argument for other terminal emulators to not implement SGR 21 at all, or do so incorrectly. [1]: https://www.ecma-international.org/publications/standards/Ecma-048.htm [2]: https://github.com/ThomasDickey/xterm-snapshots/commit/2fd29cb98d214cb536bcafbee00bc73b3f1eeb9d Signed-off-by: Mike Frysinger Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1354,6 +1354,11 @@ static void csi_m(struct vc_data *vc) case 3: vc->vc_italic = 1; break; + case 21: + /* + * No console drivers support double underline, so + * convert it to a single underline. + */ case 4: vc->vc_underline = 1; break; @@ -1389,7 +1394,6 @@ static void csi_m(struct vc_data *vc) vc->vc_disp_ctrl = 1; vc->vc_toggle_meta = 1; break; - case 21: case 22: vc->vc_intensity = 1; break;