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/*
* Check decoding of EPIOC* commands of ioctl syscall.
*
* Copyright (c) 2022-2024 Eugene Syromyatnikov <evgsyr@gmail.com>.
* Copyright (c) 2021-2024 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <linux/ioctl.h>
#include <linux/eventpoll.h>
/* A hack for handling different types of _IOC() on various platforms */
#if XLAT_RAW
# define XLAT_ARGS_U(a_) (unsigned int) (a_)
#elif XLAT_VERBOSE
# define XLAT_ARGS_U(a_) (unsigned int) (a_), #a_
#else
# define XLAT_ARGS_U(a_) #a_
#endif
#ifdef INJECT_RETVAL
# define INJSTR " (INJECTED)"
#else
# define INJSTR ""
#endif
static const char *errstr;
static long
sys_ioctl(kernel_long_t fd, kernel_ulong_t cmd, kernel_ulong_t arg)
{
const long rc = syscall(__NR_ioctl, fd, cmd, arg);
errstr = sprintrc(rc);
return rc;
}
int
main(int argc, char *argv[])
{
#ifdef INJECT_RETVAL
unsigned long num_skip;
bool locked = false;
if (argc < 2)
error_msg_and_fail("Usage: %s NUM_SKIP", argv[0]);
num_skip = strtoul(argv[1], NULL, 0);
for (unsigned int i = 0; i < num_skip; i++) {
long rc = sys_ioctl(-1, EPIOCSPARAMS, 0);
printf("ioctl(-1, %s, NULL) = %s%s\n",
XLAT_STR(EPIOCSPARAMS), sprintrc(rc),
rc == 42 ? " (INJECTED)" : "");
if (rc != 42)
continue;
locked = true;
break;
}
if (!locked) {
error_msg_and_fail("Have not locked on ioctl(-1"
", EPIOCSPARAMS, NULL) returning 42");
}
#endif /* INJECT_RETVAL */
static const struct strval32 dirs[] = {
{ ARG_STR(_IOC_NONE) },
{ ARG_STR(_IOC_READ) },
{ ARG_STR(_IOC_WRITE) },
{ ARG_STR(_IOC_READ|_IOC_WRITE) },
};
static const kernel_ulong_t magic =
(kernel_ulong_t) 0xdeadbeefbadc0dedULL;
/* Unknown epoll ioctl */
for (size_t i = 0; i < ARRAY_SIZE(dirs); i++) {
for (unsigned int j = 0; j < 8; j += 1) {
for (unsigned int k = 0; k < 32; k += 4) {
if ((j == 1 || j == 2) && k == 8)
continue;
sys_ioctl(-1, _IOC(dirs[i].val, 0x8a, k, j),
magic);
printf("ioctl(-1, "
XLAT_KNOWN(%#x,
"_IOC(%s, 0x8a, %#x, %#x)")
", %#lx) = %s" INJSTR "\n",
#if XLAT_RAW || XLAT_VERBOSE
(unsigned int) _IOC(dirs[i].val, 0x8a,
k, j),
#endif
#if !XLAT_RAW
dirs[i].str, k, j,
#endif
(unsigned long) magic, errstr);
}
}
}
/* EPIOCSPARAMS/EPIOCGPARAMS */
static struct strval32 epcmds[] = {
{ ARG_STR(EPIOCSPARAMS) },
{ ARG_STR(EPIOCGPARAMS) },
};
static const struct {
struct epoll_params val;
const char *str;
} params[] = {
{ { 0 },
"{busy_poll_usecs=0, busy_poll_budget=0, prefer_busy_poll=0}"
},
{ { 1, 2, 3 },
"{busy_poll_usecs=1" NRAW(" /* 0.000001 s */")
", busy_poll_budget=2, prefer_busy_poll=0x3}"
},
{ { 123456, 789, 234, 56 },
"{busy_poll_usecs=123456" NRAW(" /* 0.123456 s */")
", busy_poll_budget=789, prefer_busy_poll=0xea, __pad=0x38}"
},
{ { 0xfffefdfc, 0xfbfa, 0xf9, 0xf8 },
"{busy_poll_usecs=4294901244" NRAW(" /* 4294.901244 s */")
", busy_poll_budget=64506, prefer_busy_poll=0xf9, __pad=0xf8}"
},
};
TAIL_ALLOC_OBJECT_CONST_PTR(struct epoll_params, ep);
for (size_t i = 0; i < ARRAY_SIZE(epcmds); i++) {
sys_ioctl(-1, epcmds[i].val, 0);
printf("ioctl(-1, %s, NULL) = %s" INJSTR "\n",
sprintxlat(epcmds[i].str, epcmds[i].val, NULL), errstr);
sys_ioctl(-1, epcmds[i].val, (uintptr_t) ep + 1);
printf("ioctl(-1, %s, %p) = %s" INJSTR "\n",
sprintxlat(epcmds[i].str, epcmds[i].val, NULL),
(char *) ep + 1, errstr);
for (size_t j = 0; j < ARRAY_SIZE(params); j++) {
memcpy(ep, ¶ms[j].val, sizeof(params[j].val));
sys_ioctl(-1, epcmds[i].val, (uintptr_t) ep);
printf("ioctl(-1, %s, ",
sprintxlat(epcmds[i].str, epcmds[i].val, NULL));
#ifndef INJECT_RETVAL
if (epcmds[i].val == EPIOCGPARAMS) {
printf("%p", ep);
} else
#endif
{
fputs(params[j].str, stdout);
}
printf(") = %s" INJSTR "\n", errstr);
}
}
puts("+++ exited with 0 +++");
return 0;
}
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