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strace/evdev.c
Zhibin Li 5ee385e2eb evdev: fix decoding of EVIOCGBIT(0, ...) 
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"
2018-08-19 10:26:18 +00:00

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/*
* Copyright (c) 2015 Etienne Gemsa <etienne.gemsa@lse.epita.fr>
* Copyright (c) 2015-2016 Dmitry V. Levin <ldv@altlinux.org>
* Copyright (c) 2015-2018 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#include "xlat/evdev_abs.h"
#include "xlat/evdev_ev.h"
#ifdef HAVE_LINUX_INPUT_H
# include <linux/ioctl.h>
# include <linux/input.h>
# include "xlat/evdev_autorepeat.h"
# include "xlat/evdev_ff_status.h"
# include "xlat/evdev_ff_types.h"
# include "xlat/evdev_keycode.h"
# include "xlat/evdev_leds.h"
# include "xlat/evdev_misc.h"
# include "xlat/evdev_mtslots.h"
# include "xlat/evdev_prop.h"
# include "xlat/evdev_relative_axes.h"
# include "xlat/evdev_snd.h"
# include "xlat/evdev_switch.h"
# ifndef SYN_MAX
# define SYN_MAX 0xf
# endif
const size_t evdev_abs_size = ARRAY_SIZE(evdev_abs) - 1;
static int
abs_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
{
tprints(", ");
struct input_absinfo absinfo;
if (!umove_or_printaddr(tcp, arg, &absinfo)) {
tprintf("{value=%u"
", minimum=%u, ",
absinfo.value,
absinfo.minimum);
if (!abbrev(tcp)) {
tprintf("maximum=%u"
", fuzz=%u"
", flat=%u",
absinfo.maximum,
absinfo.fuzz,
absinfo.flat);
# ifdef HAVE_STRUCT_INPUT_ABSINFO_RESOLUTION
tprintf(", resolution=%u",
absinfo.resolution);
# endif
} else {
tprints("...");
}
tprints("}");
}
return RVAL_IOCTL_DECODED;
}
static int
keycode_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
{
tprints(", ");
unsigned int keycode[2];
if (!umove_or_printaddr(tcp, arg, &keycode)) {
tprintf("[%u, ", keycode[0]);
printxval_index(evdev_keycode, keycode[1], "KEY_???");
tprints("]");
}
return RVAL_IOCTL_DECODED;
}
# ifdef EVIOCGKEYCODE_V2
static int
keycode_V2_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
{
tprints(", ");
struct input_keymap_entry ike;
if (umove_or_printaddr(tcp, arg, &ike))
return RVAL_IOCTL_DECODED;
tprintf("{flags=%" PRIu8
", len=%" PRIu8 ", ",
ike.flags,
ike.len);
if (!abbrev(tcp)) {
unsigned int i;
tprintf("index=%" PRIu16 ", keycode=", ike.index);
printxval_index(evdev_keycode, ike.keycode, "KEY_???");
tprints(", scancode=[");
for (i = 0; i < ARRAY_SIZE(ike.scancode); i++) {
if (i > 0)
tprints(", ");
tprintf("%" PRIx8, ike.scancode[i]);
}
tprints("]");
} else {
tprints("...");
}
tprints("}");
return RVAL_IOCTL_DECODED;
}
# endif /* EVIOCGKEYCODE_V2 */
static int
getid_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
{
tprints(", ");
struct input_id id;
if (!umove_or_printaddr(tcp, arg, &id))
tprintf("{ID_BUS=%" PRIu16
", ID_VENDOR=%" PRIu16
", ID_PRODUCT=%" PRIu16
", ID_VERSION=%" PRIu16 "}",
id.bustype,
id.vendor,
id.product,
id.version);
return RVAL_IOCTL_DECODED;
}
static int
decode_bitset_(struct tcb *const tcp, const kernel_ulong_t arg,
const struct xlat decode_nr[], const unsigned int max_nr,
const char *const dflt, size_t decode_nr_size, enum xlat_type xt)
{
tprints(", ");
unsigned int size;
if ((kernel_ulong_t) tcp->u_rval > max_nr / 8)
size = max_nr;
else
size = tcp->u_rval * 8;
char decoded_arg[size];
if (umove_or_printaddr(tcp, arg, &decoded_arg))
return RVAL_IOCTL_DECODED;
tprints("[");
int bit_displayed = 0;
int i = next_set_bit(decoded_arg, 0, size);
if (i < 0) {
tprints(" 0 ");
} else {
printxval_dispatch(decode_nr, decode_nr_size, i, dflt, xt);
while ((i = next_set_bit(decoded_arg, i + 1, size)) > 0) {
if (abbrev(tcp) && bit_displayed >= 3) {
tprints(", ...");
break;
}
tprints(", ");
printxval_dispatch(decode_nr, decode_nr_size, i, dflt,
xt);
bit_displayed++;
}
}
tprints("]");
return RVAL_IOCTL_DECODED;
}
#define decode_bitset(tcp_, arg_, decode_nr_, max_nr_, dflt_, xt_) \
decode_bitset_((tcp_), (arg_), (decode_nr_), (max_nr_), \
(dflt_), ARRAY_SIZE(decode_nr_), (xt_))
# ifdef EVIOCGMTSLOTS
static int
mtslots_ioctl(struct tcb *const tcp, const unsigned int code,
const kernel_ulong_t arg)
{
tprints(", ");
const size_t size = _IOC_SIZE(code) / sizeof(int);
if (!size) {
printaddr(arg);
return RVAL_IOCTL_DECODED;
}
int buffer[size];
if (umove_or_printaddr(tcp, arg, &buffer))
return RVAL_IOCTL_DECODED;
tprints("{code=");
printxval(evdev_mtslots, buffer[0], "ABS_MT_???");
tprints(", values=[");
unsigned int i;
for (i = 1; i < ARRAY_SIZE(buffer); i++)
tprintf("%s%d", i > 1 ? ", " : "", buffer[i]);
tprints("]}");
return RVAL_IOCTL_DECODED;
}
# endif /* EVIOCGMTSLOTS */
# if defined EVIOCGREP || defined EVIOCSREP
static int
repeat_ioctl(struct tcb *const tcp, const kernel_ulong_t arg)
{
tprints(", ");
printpair_int(tcp, arg, "%u");
return RVAL_IOCTL_DECODED;
}
# endif /* EVIOCGREP || EVIOCSREP */
static int
bit_ioctl(struct tcb *const tcp, const unsigned int ev_nr,
const kernel_ulong_t arg)
{
switch (ev_nr) {
case 0:
return decode_bitset(tcp, arg, evdev_ev,
EV_MAX, "EV_???", XT_SORTED);
case EV_KEY:
return decode_bitset(tcp, arg, evdev_keycode,
KEY_MAX, "KEY_???", XT_INDEXED);
case EV_REL:
return decode_bitset(tcp, arg, evdev_relative_axes,
REL_MAX, "REL_???", XT_INDEXED);
case EV_ABS:
return decode_bitset(tcp, arg, evdev_abs,
ABS_MAX, "ABS_???", XT_INDEXED);
case EV_MSC:
return decode_bitset(tcp, arg, evdev_misc,
MSC_MAX, "MSC_???", XT_INDEXED);
case EV_SW:
return decode_bitset(tcp, arg, evdev_switch,
SW_MAX, "SW_???", XT_INDEXED);
case EV_LED:
return decode_bitset(tcp, arg, evdev_leds,
LED_MAX, "LED_???", XT_INDEXED);
case EV_SND:
return decode_bitset(tcp, arg, evdev_snd,
SND_MAX, "SND_???", XT_INDEXED);
case EV_REP:
return decode_bitset(tcp, arg, evdev_autorepeat,
REP_MAX, "REP_???", XT_INDEXED);
case EV_FF:
return decode_bitset(tcp, arg, evdev_ff_types,
FF_MAX, "FF_???", XT_SORTED);
case EV_PWR:
tprints(", ");
printnum_int(tcp, arg, "%d");
return RVAL_IOCTL_DECODED;
case EV_FF_STATUS:
return decode_bitset(tcp, arg, evdev_ff_status,
FF_STATUS_MAX, "FF_STATUS_???",
XT_INDEXED);
default:
tprints(", ");
printaddr(arg);
return RVAL_IOCTL_DECODED;
}
}
static int
evdev_read_ioctl(struct tcb *const tcp, const unsigned int code,
const kernel_ulong_t arg)
{
/* fixed-number fixed-length commands */
switch (code) {
case EVIOCGVERSION:
tprints(", ");
printnum_int(tcp, arg, "%#x");
return RVAL_IOCTL_DECODED;
case EVIOCGEFFECTS:
tprints(", ");
printnum_int(tcp, arg, "%u");
return RVAL_IOCTL_DECODED;
case EVIOCGID:
return getid_ioctl(tcp, arg);
# ifdef EVIOCGREP
case EVIOCGREP:
return repeat_ioctl(tcp, arg);
# endif
case EVIOCGKEYCODE:
return keycode_ioctl(tcp, arg);
# ifdef EVIOCGKEYCODE_V2
case EVIOCGKEYCODE_V2:
return keycode_V2_ioctl(tcp, arg);
# endif
}
/* fixed-number variable-length commands */
switch (_IOC_NR(code)) {
# ifdef EVIOCGMTSLOTS
case _IOC_NR(EVIOCGMTSLOTS(0)):
return mtslots_ioctl(tcp, code, arg);
# endif
case _IOC_NR(EVIOCGNAME(0)):
case _IOC_NR(EVIOCGPHYS(0)):
case _IOC_NR(EVIOCGUNIQ(0)):
tprints(", ");
if (syserror(tcp))
printaddr(arg);
else
printstrn(tcp, arg, tcp->u_rval);
return RVAL_IOCTL_DECODED;
# ifdef EVIOCGPROP
case _IOC_NR(EVIOCGPROP(0)):
return decode_bitset(tcp, arg, evdev_prop,
INPUT_PROP_MAX, "PROP_???",
XT_INDEXED);
# endif
case _IOC_NR(EVIOCGSND(0)):
return decode_bitset(tcp, arg, evdev_snd,
SND_MAX, "SND_???", XT_INDEXED);
# ifdef EVIOCGSW
case _IOC_NR(EVIOCGSW(0)):
return decode_bitset(tcp, arg, evdev_switch,
SW_MAX, "SW_???", XT_INDEXED);
# endif
case _IOC_NR(EVIOCGKEY(0)):
return decode_bitset(tcp, arg, evdev_keycode,
KEY_MAX, "KEY_???", XT_INDEXED);
case _IOC_NR(EVIOCGLED(0)):
return decode_bitset(tcp, arg, evdev_leds,
LED_MAX, "LED_???", XT_INDEXED);
}
/* multi-number fixed-length commands */
if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0)))
return abs_ioctl(tcp, arg);
/* multi-number variable-length commands */
if ((_IOC_NR(code) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
return bit_ioctl(tcp, _IOC_NR(code) & EV_MAX, arg);
return 0;
}
static int
evdev_write_ioctl(struct tcb *const tcp, const unsigned int code,
const kernel_ulong_t arg)
{
/* fixed-number fixed-length commands */
switch (code) {
# ifdef EVIOCSREP
case EVIOCSREP:
return repeat_ioctl(tcp, arg);
# endif
case EVIOCSKEYCODE:
return keycode_ioctl(tcp, arg);
# ifdef EVIOCSKEYCODE_V2
case EVIOCSKEYCODE_V2:
return keycode_V2_ioctl(tcp, arg);
# endif
case EVIOCRMFF:
tprintf(", %d", (int) arg);
return RVAL_IOCTL_DECODED;
case EVIOCGRAB:
# ifdef EVIOCREVOKE
case EVIOCREVOKE:
# endif
tprintf(", %" PRI_klu, arg);
return RVAL_IOCTL_DECODED;
# ifdef EVIOCSCLOCKID
case EVIOCSCLOCKID:
tprints(", ");
printnum_int(tcp, arg, "%u");
return RVAL_IOCTL_DECODED;
# endif
default: {
int rc = evdev_write_ioctl_mpers(tcp, code, arg);
if (rc != RVAL_DECODED)
return rc;
}
}
/* multi-number fixed-length commands */
if ((_IOC_NR(code) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0)))
return abs_ioctl(tcp, arg);
return 0;
}
void
print_evdev_ff_type(const kernel_ulong_t val)
{
printxval(evdev_ff_types, val, "FF_???");
}
int
evdev_ioctl(struct tcb *const tcp,
const unsigned int code, const kernel_ulong_t arg)
{
switch (_IOC_DIR(code)) {
case _IOC_READ:
if (entering(tcp))
return 0;
return evdev_read_ioctl(tcp, code, arg);
case _IOC_WRITE:
return evdev_write_ioctl(tcp, code, arg) | RVAL_DECODED;
default:
return RVAL_DECODED;
}
}
#endif /* HAVE_LINUX_INPUT_H */
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