5ee385e2eb
There is a comment in drivers/input/evdev.c which says: /* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */ That is, EVIOCGBIT(0, ...) should return a bit mask with supported event types instead of SYN_* event codes. * defs.h (evdev_ev): New prototype. * evdev.c: Include "xlat/evdev_ev.h" and remove "xlat/evdev_sync.h". (bit_ioctl) <case EV_SYN>: Replace EV_SYN with 0, use evdev_ev with XT_SORTED in decode_bitset invocation instead. * ioctl.c: Do not include "xlat/evdev_ev.h". (evdev_decode_number): Print nr == 0x20 as "0" instead of "EV_SYN". * tests/ioctl_evdev.c (main): Use 0 instead of EV_SYN in EVIOCGBIT output. * xlat/evdev_sync.in: Remove. Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org> Fixes: v4.10~89 "Add decoding for evdev ioctls"
381 lines
9.9 KiB
C
381 lines
9.9 KiB
C
/*
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* Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
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* Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
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* Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
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* Copyright (c) 1996-2001 Wichert Akkerman <wichert@cistron.nl>
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* Copyright (c) 1999-2018 The strace developers.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include <linux/ioctl.h>
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#include "xlat/ioctl_dirs.h"
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static int
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compare(const void *a, const void *b)
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{
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const unsigned int code1 = (const uintptr_t) a;
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const unsigned int code2 = ((struct_ioctlent *) b)->code;
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return (code1 > code2) ? 1 : (code1 < code2) ? -1 : 0;
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}
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static const struct_ioctlent *
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ioctl_lookup(const unsigned int code)
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{
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struct_ioctlent *iop;
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iop = bsearch((const void *) (const uintptr_t) code, ioctlent,
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nioctlents, sizeof(ioctlent[0]), compare);
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while (iop > ioctlent) {
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iop--;
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if (iop->code != code) {
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iop++;
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break;
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}
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}
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return iop;
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}
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static const struct_ioctlent *
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ioctl_next_match(const struct_ioctlent *iop)
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{
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const unsigned int code = iop->code;
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iop++;
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if (iop < ioctlent + nioctlents && iop->code == code)
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return iop;
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return NULL;
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}
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static void
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ioctl_print_code(const unsigned int code)
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{
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tprints("_IOC(");
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printflags(ioctl_dirs, _IOC_DIR(code), "_IOC_???");
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tprintf(", %#x, %#x, %#x)",
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_IOC_TYPE(code), _IOC_NR(code), _IOC_SIZE(code));
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}
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static int
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evdev_decode_number(const unsigned int code)
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{
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const unsigned int nr = _IOC_NR(code);
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if (_IOC_DIR(code) == _IOC_WRITE) {
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if (nr >= 0xc0 && nr <= 0xc0 + 0x3f) {
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tprints("EVIOCSABS(");
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printxval_indexn(evdev_abs, evdev_abs_size, nr - 0xc0,
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"ABS_???");
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tprints(")");
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return 1;
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}
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}
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if (_IOC_DIR(code) != _IOC_READ)
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return 0;
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if (nr >= 0x20 && nr <= 0x20 + 0x1f) {
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tprints("EVIOCGBIT(");
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if (nr == 0x20)
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tprintf("0");
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else
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printxval(evdev_ev, nr - 0x20, "EV_???");
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tprintf(", %u)", _IOC_SIZE(code));
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return 1;
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} else if (nr >= 0x40 && nr <= 0x40 + 0x3f) {
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tprints("EVIOCGABS(");
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printxval_indexn(evdev_abs, evdev_abs_size, nr - 0x40,
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"ABS_???");
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tprints(")");
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return 1;
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}
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switch (_IOC_NR(nr)) {
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case 0x06:
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tprintf("EVIOCGNAME(%u)", _IOC_SIZE(code));
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return 1;
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case 0x07:
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tprintf("EVIOCGPHYS(%u)", _IOC_SIZE(code));
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return 1;
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case 0x08:
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tprintf("EVIOCGUNIQ(%u)", _IOC_SIZE(code));
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return 1;
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case 0x09:
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tprintf("EVIOCGPROP(%u)", _IOC_SIZE(code));
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return 1;
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case 0x0a:
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tprintf("EVIOCGMTSLOTS(%u)", _IOC_SIZE(code));
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return 1;
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case 0x18:
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tprintf("EVIOCGKEY(%u)", _IOC_SIZE(code));
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return 1;
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case 0x19:
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tprintf("EVIOCGLED(%u)", _IOC_SIZE(code));
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return 1;
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case 0x1a:
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tprintf("EVIOCGSND(%u)", _IOC_SIZE(code));
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return 1;
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case 0x1b:
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tprintf("EVIOCGSW(%u)", _IOC_SIZE(code));
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return 1;
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default:
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return 0;
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}
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}
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static int
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hiddev_decode_number(const unsigned int code)
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{
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if (_IOC_DIR(code) == _IOC_READ) {
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switch (_IOC_NR(code)) {
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case 0x04:
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tprintf("HIDIOCGRAWNAME(%u)", _IOC_SIZE(code));
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return 1;
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case 0x05:
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tprintf("HIDIOCGRAWPHYS(%u)", _IOC_SIZE(code));
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return 1;
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case 0x06:
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tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
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return 1;
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case 0x12:
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tprintf("HIDIOCGPHYS(%u)", _IOC_SIZE(code));
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return 1;
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default:
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return 0;
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}
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} else if (_IOC_DIR(code) == (_IOC_READ | _IOC_WRITE)) {
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switch (_IOC_NR(code)) {
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case 0x06:
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tprintf("HIDIOCSFEATURE(%u)", _IOC_SIZE(code));
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return 1;
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case 0x07:
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tprintf("HIDIOCGFEATURE(%u)", _IOC_SIZE(code));
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return 1;
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default:
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return 0;
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}
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}
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return 0;
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}
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static int
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ioctl_decode_command_number(struct tcb *tcp)
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{
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const unsigned int code = tcp->u_arg[1];
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switch (_IOC_TYPE(code)) {
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case 'E':
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return evdev_decode_number(code);
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case 'H':
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return hiddev_decode_number(code);
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case 'M':
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if (_IOC_DIR(code) == _IOC_WRITE) {
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tprintf("MIXER_WRITE(%u)", _IOC_NR(code));
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return 1;
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} else if (_IOC_DIR(code) == _IOC_READ) {
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tprintf("MIXER_READ(%u)", _IOC_NR(code));
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return 1;
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}
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return 0;
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case 'U':
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if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x2c) {
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tprintf("UI_GET_SYSNAME(%u)", _IOC_SIZE(code));
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return 1;
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}
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return 0;
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case 'j':
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if (_IOC_DIR(code) == _IOC_READ && _IOC_NR(code) == 0x13) {
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tprintf("JSIOCGNAME(%u)", _IOC_SIZE(code));
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return 1;
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}
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return 0;
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case 'k':
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if (_IOC_DIR(code) == _IOC_WRITE && _IOC_NR(code) == 0) {
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tprintf("SPI_IOC_MESSAGE(%u)", _IOC_SIZE(code));
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return 1;
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}
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return 0;
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default:
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return 0;
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}
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}
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/**
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* Decode arg parameter of the ioctl call.
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*
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* @return There are two flags of the return value important for the purposes of
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* processing by SYS_FUNC(ioctl):
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* - RVAL_IOCTL_DECODED: indicates that ioctl decoder code
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* has printed arg parameter;
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* - RVAL_DECODED: indicates that decoding is done.
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* As a result, the following behaviour is expected:
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* - on entering:
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* - 0: decoding should be continued on exiting;
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* - RVAL_IOCTL_DECODED: decoding on exiting is not needed
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* and decoder has printed arg value;
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* - RVAL_DECODED: decoding on exiting is not needed
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* and generic handler should print arg value.
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* - on exiting:
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* - 0: generic handler should print arg value;
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* - RVAL_IOCTL_DECODED: decoder has printed arg value.
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*
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* Note that it makes no sense to return just RVAL_DECODED on exiting,
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* but, of course, it is not prohibited (for example, it may be useful
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* in cases where the return path is common on entering and on exiting
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* the syscall).
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*
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* SYS_FUNC(ioctl) converts RVAL_IOCTL_DECODED flag to RVAL_DECODED,
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* and passes all other bits of ioctl_decode return value unchanged.
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*/
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static int
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ioctl_decode(struct tcb *tcp)
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{
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const unsigned int code = tcp->u_arg[1];
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const kernel_ulong_t arg = tcp->u_arg[2];
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switch (_IOC_TYPE(code)) {
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case '$':
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return perf_ioctl(tcp, code, arg);
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#if defined(ALPHA) || defined(POWERPC)
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case 'f': {
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int ret = file_ioctl(tcp, code, arg);
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if (ret != RVAL_DECODED)
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return ret;
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ATTRIBUTE_FALLTHROUGH;
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}
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case 't':
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case 'T':
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return term_ioctl(tcp, code, arg);
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#else /* !ALPHA */
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case 'f':
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return file_ioctl(tcp, code, arg);
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case 0x54:
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#endif /* !ALPHA */
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return term_ioctl(tcp, code, arg);
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case 0x89:
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return sock_ioctl(tcp, code, arg);
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case 'p':
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return rtc_ioctl(tcp, code, arg);
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case 0x03:
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return hdio_ioctl(tcp, code, arg);
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case 0x12:
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return block_ioctl(tcp, code, arg);
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case 'X':
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return fs_x_ioctl(tcp, code, arg);
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case 0x22:
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return scsi_ioctl(tcp, code, arg);
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case 'L':
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return loop_ioctl(tcp, code, arg);
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#ifdef HAVE_STRUCT_MTD_WRITE_REQ
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case 'M':
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return mtd_ioctl(tcp, code, arg);
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#endif
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#ifdef HAVE_STRUCT_UBI_ATTACH_REQ_MAX_BEB_PER1024
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case 'o':
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case 'O':
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return ubi_ioctl(tcp, code, arg);
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#endif
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case 'V':
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return v4l2_ioctl(tcp, code, arg);
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#ifdef HAVE_STRUCT_PTP_SYS_OFFSET
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case '=':
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return ptp_ioctl(tcp, code, arg);
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#endif
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#ifdef HAVE_LINUX_INPUT_H
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case 'E':
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return evdev_ioctl(tcp, code, arg);
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#endif
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#ifdef HAVE_LINUX_USERFAULTFD_H
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case 0xaa:
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return uffdio_ioctl(tcp, code, arg);
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#endif
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#ifdef HAVE_LINUX_BTRFS_H
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case 0x94:
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return btrfs_ioctl(tcp, code, arg);
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#endif
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case 0xb7:
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return nsfs_ioctl(tcp, code, arg);
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#ifdef HAVE_LINUX_DM_IOCTL_H
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case 0xfd:
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return dm_ioctl(tcp, code, arg);
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#endif
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#ifdef HAVE_LINUX_KVM_H
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case 0xae:
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return kvm_ioctl(tcp, code, arg);
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#endif
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case 'I':
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return inotify_ioctl(tcp, code, arg);
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default:
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break;
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}
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return 0;
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}
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SYS_FUNC(ioctl)
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{
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const struct_ioctlent *iop;
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int ret;
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if (entering(tcp)) {
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printfd(tcp, tcp->u_arg[0]);
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tprints(", ");
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if (xlat_verbosity != XLAT_STYLE_ABBREV)
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tprintf("%#x", (unsigned int) tcp->u_arg[1]);
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if (xlat_verbosity == XLAT_STYLE_VERBOSE)
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tprints(" /* ");
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if (xlat_verbosity != XLAT_STYLE_RAW) {
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ret = ioctl_decode_command_number(tcp);
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if (!(ret & IOCTL_NUMBER_STOP_LOOKUP)) {
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iop = ioctl_lookup(tcp->u_arg[1]);
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if (iop) {
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if (ret)
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tprints(" or ");
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tprints(iop->symbol);
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while ((iop = ioctl_next_match(iop)))
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tprintf(" or %s", iop->symbol);
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} else if (!ret) {
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ioctl_print_code(tcp->u_arg[1]);
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}
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}
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}
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if (xlat_verbosity == XLAT_STYLE_VERBOSE)
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tprints(" */");
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ret = ioctl_decode(tcp);
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} else {
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ret = ioctl_decode(tcp) | RVAL_DECODED;
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}
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if (ret & RVAL_IOCTL_DECODED) {
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ret &= ~RVAL_IOCTL_DECODED;
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ret |= RVAL_DECODED;
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} else if (ret & RVAL_DECODED) {
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tprintf(", %#" PRI_klx, tcp->u_arg[2]);
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}
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return ret;
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}
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