From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 274D212C558; Sun, 28 Jan 2024 16:15:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706458537; cv=none; b=d8vaFxwNtBuKL/CkedtNFg30hvGVfVhR3Kf1cKYfw6MF/fNBp5fjYClrZUTspdoL9o41wESyp2FI+IRMJuBliqzkY8d5z/NtuxnFK2YJgECaKzLAqqDpNKxqRQjt62pIVpAn2aOkV+NXlTPLlax+AxShtB7B+i4UABg+sqE9inI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706458537; c=relaxed/simple; bh=OGli1iqfWIparKcCK3HzdR9pfjfzODT0novBM1V+ryw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bHaeI+Wyn/XDQjnSioOKv5W2DGsctDSuyxqaf3BnV6CbtRQJUjaEsZlcmEAV5ODzY7q+vgFf9L6fwDD8zQCPAbX7dxeUGITZLjw5Fpn+mp1MLtUkKbehkMRbCqghHB1Jtj+Y70K5kWEiTgmMfbcMDyokO6sUjR51V952BzAuoJo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EOn56Mal; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EOn56Mal" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0856AC43399; Sun, 28 Jan 2024 16:15:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706458537; bh=OGli1iqfWIparKcCK3HzdR9pfjfzODT0novBM1V+ryw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EOn56Mal+C0lzcMr5hRF3x4/3BTRdxY0IPY0BEeSaCfWUKZioUUN4bViNTkBExwBR JhQOmP1r4ZpFhwcSY9mVJXKOfmMfW5UiHd6No+fL1dfZHyivqplUjE+5MTLlPFLq2l 0MwhZLRk7n/m58loTY2YWV297Dn52e9FHhx4ZuWkjO3Ml7jn/o8XfwjTewPSmoAkFb 72/G7itPa51I1JHVR2JZUZZVdx2gk2qE6NI0hrqS/wefXWMNtdlXAjxs4Z04WxgZB9 uYabEkqlfNTnxu2Rvapswhp+bq8mR21oVtrIWF+YWqkAUzk5HkDdKHfPkvhGFUmY6+ 5WTepYM6kunSg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Adrian Reber , Christian Brauner , Andrei Vagin , Greg Kroah-Hartman , Sasha Levin , jirislaby@kernel.org, linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 07/19] tty: allow TIOCSLCKTRMIOS with CAP_CHECKPOINT_RESTORE Date: Sun, 28 Jan 2024 11:15:04 -0500 Message-ID: <20240128161524.204182-7-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240128161524.204182-1-sashal@kernel.org> References: <20240128161524.204182-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.148 Content-Transfer-Encoding: 8bit From: Adrian Reber [ Upstream commit e0f25b8992345aa5f113da2815f5add98738c611 ] The capability CAP_CHECKPOINT_RESTORE was introduced to allow non-root users to checkpoint and restore processes as non-root with CRIU. This change extends CAP_CHECKPOINT_RESTORE to enable the CRIU option '--shell-job' as non-root. CRIU's man-page describes the '--shell-job' option like this: Allow one to dump shell jobs. This implies the restored task will inherit session and process group ID from the criu itself. This option also allows to migrate a single external tty connection, to migrate applications like top. TIOCSLCKTRMIOS can only be done if the process has CAP_SYS_ADMIN and this change extends it to CAP_SYS_ADMIN or CAP_CHECKPOINT_RESTORE. With this change it is possible to checkpoint and restore processes which have a tty connection as non-root if CAP_CHECKPOINT_RESTORE is set. Acked-by: Christian Brauner Signed-off-by: Adrian Reber Acked-by: Andrei Vagin Link: https://lore.kernel.org/r/20231208143656.1019-1-areber@redhat.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/tty_ioctl.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c index 1736130f9c39..1c7c3a37099d 100644 --- a/drivers/tty/tty_ioctl.c +++ b/drivers/tty/tty_ioctl.c @@ -786,7 +786,7 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file, ret = -EFAULT; return ret; case TIOCSLCKTRMIOS: - if (!capable(CAP_SYS_ADMIN)) + if (!checkpoint_restore_ns_capable(&init_user_ns)) return -EPERM; copy_termios_locked(real_tty, &kterm); if (user_termios_to_kernel_termios(&kterm, @@ -803,7 +803,7 @@ int tty_mode_ioctl(struct tty_struct *tty, struct file *file, ret = -EFAULT; return ret; case TIOCSLCKTRMIOS: - if (!capable(CAP_SYS_ADMIN)) + if (!checkpoint_restore_ns_capable(&init_user_ns)) return -EPERM; copy_termios_locked(real_tty, &kterm); if (user_termios_to_kernel_termios_1(&kterm, -- 2.43.0