70b02a42b7
will return success when the kernel is built without support of the capability mode. It is important to note, that I'm taking a more conservative approach with these changes and it will be done in small steps. Reviewed by: jhb MFC after: 6 weeks Differential Revision: https://reviews.freebsd.org/D18744
177 lines
3.8 KiB
C
177 lines
3.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#ifndef WITHOUT_CAPSICUM
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#include <sys/capsicum.h>
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#endif
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#include <sys/select.h>
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#ifndef WITHOUT_CAPSICUM
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#include <capsicum_helpers.h>
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#endif
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <termios.h>
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#include <unistd.h>
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#include <stdbool.h>
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#include <sysexits.h>
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#include "inout.h"
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#include "pci_lpc.h"
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#define BVM_CONSOLE_PORT 0x220
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#define BVM_CONS_SIG ('b' << 8 | 'v')
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static struct termios tio_orig, tio_new;
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static void
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ttyclose(void)
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{
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tcsetattr(STDIN_FILENO, TCSANOW, &tio_orig);
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}
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static void
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ttyopen(void)
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{
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tcgetattr(STDIN_FILENO, &tio_orig);
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cfmakeraw(&tio_new);
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tcsetattr(STDIN_FILENO, TCSANOW, &tio_new);
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atexit(ttyclose);
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}
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static bool
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tty_char_available(void)
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{
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fd_set rfds;
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struct timeval tv;
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FD_ZERO(&rfds);
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FD_SET(STDIN_FILENO, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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if (select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv) > 0) {
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return (true);
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} else {
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return (false);
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}
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}
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static int
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ttyread(void)
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{
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char rb;
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if (tty_char_available()) {
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read(STDIN_FILENO, &rb, 1);
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return (rb & 0xff);
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} else {
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return (-1);
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}
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}
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static void
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ttywrite(unsigned char wb)
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{
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(void) write(STDOUT_FILENO, &wb, 1);
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}
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static int
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console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
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uint32_t *eax, void *arg)
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{
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static int opened;
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#ifndef WITHOUT_CAPSICUM
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cap_rights_t rights;
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cap_ioctl_t cmds[] = { TIOCGETA, TIOCSETA, TIOCGWINSZ };
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#endif
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if (bytes == 2 && in) {
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*eax = BVM_CONS_SIG;
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return (0);
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}
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/*
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* Guests might probe this port to look for old ISA devices
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* using single-byte reads. Return 0xff for those.
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*/
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if (bytes == 1 && in) {
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*eax = 0xff;
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return (0);
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}
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if (bytes != 4)
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return (-1);
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if (!opened) {
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#ifndef WITHOUT_CAPSICUM
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cap_rights_init(&rights, CAP_EVENT, CAP_IOCTL, CAP_READ,
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CAP_WRITE);
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if (caph_rights_limit(STDIN_FILENO, &rights) == -1)
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errx(EX_OSERR, "Unable to apply rights for sandbox");
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if (caph_ioctls_limit(STDIN_FILENO, cmds, nitems(cmds)) == -1)
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errx(EX_OSERR, "Unable to apply rights for sandbox");
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#endif
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ttyopen();
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opened = 1;
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}
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if (in)
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*eax = ttyread();
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else
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ttywrite(*eax);
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return (0);
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}
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SYSRES_IO(BVM_CONSOLE_PORT, 4);
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static struct inout_port consport = {
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"bvmcons",
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BVM_CONSOLE_PORT,
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1,
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IOPORT_F_INOUT,
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console_handler
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};
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void
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init_bvmcons(void)
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{
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register_inout(&consport);
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}
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