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/*
* This file is part of pselect6* strace tests.
*
* Copyright (c) 2015-2021 Dmitry V. Levin <ldv@strace.io>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* Based on test by Dr. David Alan Gilbert <dave@treblig.org>
*/
#include "nsig.h"
#include <assert.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/time.h>
#include "kernel_timespec.h"
static const char *errstr;
static long
pselect6(const unsigned int nfds,
void *const rfds,
void *const wfds,
void *const efds,
void *const timeout,
void *const sigmask)
{
static const kernel_ulong_t fill =
(kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t arg1 = nfds | fill;
const kernel_ulong_t arg2 = f8ill_ptr_to_kulong(rfds);
const kernel_ulong_t arg3 = f8ill_ptr_to_kulong(wfds);
const kernel_ulong_t arg4 = f8ill_ptr_to_kulong(efds);
const kernel_ulong_t arg5 = f8ill_ptr_to_kulong(timeout);
const kernel_ulong_t arg6 = f8ill_ptr_to_kulong(sigmask);
const long rc = syscall(SYSCALL_NR, arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
static fd_set set[3][0x1000000 / sizeof(fd_set)];
static void
handler(int signo)
{
}
struct sigset_argpack {
kernel_ulong_t p, size;
};
int main(int ac, char **av)
{
static const pselect6_timespec_t ts_in = {
.tv_sec = 0xc0de1, .tv_nsec = 0xc0de2
};
pselect6_timespec_t *const ts = tail_memdup(&ts_in, sizeof(ts_in));
sigset_t mask;
sigemptyset(&mask);
sigaddset(&mask, SIGHUP);
sigaddset(&mask, SIGCHLD);
TAIL_ALLOC_OBJECT_CONST_PTR(struct sigset_argpack, sigmask_arg);
sigmask_arg->p = (uintptr_t) &mask;
sigmask_arg->size = NSIG_BYTES;
TAIL_ALLOC_OBJECT_CONST_PTR(struct sigset_argpack, nullmask_arg);
nullmask_arg->p = 0;
nullmask_arg->size = NSIG_BYTES;
int fds[2];
if (pipe(fds))
perror_msg_and_fail("pipe");
/*
* Start with a nice simple pselect6.
*/
FD_SET(fds[0], set[0]);
FD_SET(fds[1], set[0]);
FD_SET(fds[0], set[1]);
FD_SET(fds[1], set[1]);
FD_SET(1, set[2]);
FD_SET(2, set[2]);
int rc = pselect6(fds[1] + 1, set[0], set[1], set[2], NULL, nullmask_arg);
if (rc < 0)
perror_msg_and_skip("pselect6");
assert(rc == 1);
printf("%s(%d, [%d %d], [%d %d], [1 2], NULL"
", {sigmask=NULL, sigsetsize=%u}) = 1 (out [%d])\n",
SYSCALL_NAME, fds[1] + 1, fds[0], fds[1],
fds[0], fds[1],
NSIG_BYTES, fds[1]);
/*
* Another simple one, with a timeout.
*/
FD_SET(1, set[1]);
FD_SET(2, set[1]);
FD_SET(fds[0], set[1]);
FD_SET(fds[1], set[1]);
assert(pselect6(fds[1] + 1, NULL, set[1], NULL, ts, NULL) == 3);
printf("%s(%d, NULL, [1 2 %d %d], NULL"
", {tv_sec=%lld, tv_nsec=%llu}, NULL) = 3 (out [1 2 %d]"
", left {tv_sec=%lld, tv_nsec=%llu})\n",
SYSCALL_NAME,
fds[1] + 1, fds[0], fds[1], (long long) ts_in.tv_sec,
zero_extend_signed_to_ull(ts_in.tv_nsec),
fds[1], (long long) ts->tv_sec,
zero_extend_signed_to_ull(ts->tv_nsec));
/*
* Now the crash case that trinity found, negative nfds
* but with a pointer to a large chunk of valid memory.
*/
FD_ZERO(set[0]);
FD_SET(fds[1], set[0]);
assert(pselect6(-1, NULL, set[0], NULL, NULL, sigmask_arg) == -1);
printf("%s(-1, NULL, %p, NULL, NULL"
", {sigmask=[HUP CHLD], sigsetsize=%u}) = %s\n",
SYSCALL_NAME, set[0], NSIG_BYTES, errstr);
/*
* Another variant, with nfds exceeding FD_SETSIZE limit.
*/
FD_ZERO(set[0]);
FD_SET(fds[0], set[0]);
FD_ZERO(set[1]);
ts->tv_sec = 0;
ts->tv_nsec = 123;
assert(pselect6(FD_SETSIZE + 1, set[0], set[1], NULL, ts, sigmask_arg) == 0);
printf("%s(%d, [%d], [], NULL, {tv_sec=0, tv_nsec=123}"
", {sigmask=[HUP CHLD], sigsetsize=%u}) = 0 (Timeout)\n",
SYSCALL_NAME, FD_SETSIZE + 1, fds[0], NSIG_BYTES);
/*
* See how timeouts are decoded.
*/
ts->tv_sec = 0xdeadbeefU;
ts->tv_nsec = 0xfacefeedU;
assert(pselect6(0, NULL, NULL, NULL, ts, nullmask_arg) == -1);
printf("%s(0, NULL, NULL, NULL, {tv_sec=%lld, tv_nsec=%llu}"
", {sigmask=NULL, sigsetsize=%u}) = %s\n",
SYSCALL_NAME, (long long) ts->tv_sec,
zero_extend_signed_to_ull(ts->tv_nsec),
NSIG_BYTES, errstr);
ts->tv_sec = (typeof(ts->tv_sec)) 0xcafef00ddeadbeefLL;
ts->tv_nsec = (typeof(ts->tv_nsec)) 0xbadc0dedfacefeedLL;
assert(pselect6(0, NULL, NULL, NULL, ts, nullmask_arg) == -1);
printf("%s(0, NULL, NULL, NULL, {tv_sec=%lld, tv_nsec=%llu}"
", {sigmask=NULL, sigsetsize=%u}) = %s\n",
SYSCALL_NAME, (long long) ts->tv_sec,
zero_extend_signed_to_ull(ts->tv_nsec),
NSIG_BYTES, errstr);
const struct sigaction act = { .sa_handler = handler };
if (sigaction(SIGALRM, &act, NULL))
perror_msg_and_fail("sigaction SIGALRM");
const struct itimerval itv = { .it_value.tv_usec = 111111 };
if (setitimer(ITIMER_REAL, &itv, NULL))
perror_msg_and_fail("setitimer ITIMER_REAL");
ts->tv_sec = 0;
ts->tv_nsec = 222222222;
assert(pselect6(0, NULL, NULL, NULL, ts, sigmask_arg) == -1);
printf("%s(0, NULL, NULL, NULL, {tv_sec=0, tv_nsec=222222222}"
", {sigmask=[HUP CHLD], sigsetsize=%u})"
" = ? ERESTARTNOHAND (To be restarted if no handler)\n",
SYSCALL_NAME, NSIG_BYTES);
puts("--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---");
puts("+++ exited with 0 +++");
return 0;
}
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