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/*
* Check decoding of select/_newselect syscalls.
*
* Copyright (c) 2015-2018 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* Based on test by Dr. David Alan Gilbert <dave@treblig.org>
*/
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/select.h>
static const char *errstr;
static long
xselect(const kernel_ulong_t nfds,
const kernel_ulong_t rs,
const kernel_ulong_t ws,
const kernel_ulong_t es,
const kernel_ulong_t tv)
#ifndef xselect
{
long rc = syscall(TEST_SYSCALL_NR,
F8ILL_KULONG_MASK | nfds, rs, ws, es, tv);
errstr = sprintrc(rc);
return rc;
}
#else
;
#endif
#define XSELECT(expected_, ...) \
do { \
long rc = xselect(__VA_ARGS__); \
if (rc != (expected_)) \
perror_msg_and_fail(TEST_SYSCALL_STR \
": expected %d" \
", returned %ld", \
(expected_), rc); \
} while (0) \
/* End of XSELECT definition. */
int
main(void)
{
#ifdef PATH_TRACING_FD
skip_if_unavailable("/proc/self/fd/");
#endif
for (int i = 3; i < FD_SETSIZE; ++i) {
#ifdef PATH_TRACING_FD
if (i == PATH_TRACING_FD)
continue;
#endif
(void) close(i);
}
int fds[2];
if (pipe(fds))
perror_msg_and_fail("pipe");
static const int smallset_size = sizeof(kernel_ulong_t) * 8;
const int nfds = fds[1] + 1;
if (nfds > smallset_size)
error_msg_and_fail("nfds[%d] > smallset_size[%d]\n",
nfds, smallset_size);
struct timeval tv_in = { 0, 123 };
struct timeval *const tv = tail_memdup(&tv_in, sizeof(tv_in));
const uintptr_t a_tv = (uintptr_t) tv;
TAIL_ALLOC_OBJECT_VAR_PTR(kernel_ulong_t, l_rs);
fd_set *const rs = (void *) l_rs;
const uintptr_t a_rs = (uintptr_t) rs;
TAIL_ALLOC_OBJECT_VAR_PTR(kernel_ulong_t, l_ws);
fd_set *const ws = (void *) l_ws;
const uintptr_t a_ws = (uintptr_t) ws;
TAIL_ALLOC_OBJECT_VAR_PTR(kernel_ulong_t, l_es);
fd_set *const es = (void *) l_es;
const uintptr_t a_es = (uintptr_t) es;
long rc;
/*
* An equivalent of nanosleep.
*/
if (xselect(0, 0, 0, 0, a_tv)) {
if (errno == ENOSYS)
perror_msg_and_skip(TEST_SYSCALL_STR);
else
perror_msg_and_fail(TEST_SYSCALL_STR);
}
#ifndef PATH_TRACING_FD
printf("%s(0, NULL, NULL, NULL, {tv_sec=%lld, tv_usec=%llu})"
" = 0 (Timeout)\n",
TEST_SYSCALL_STR, (long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec));
#endif
/* EFAULT on tv argument */
XSELECT(-1, 0, 0, 0, 0, a_tv + 1);
#ifndef PATH_TRACING_FD
printf("%s(0, NULL, NULL, NULL, %#lx) = %s\n",
TEST_SYSCALL_STR, (unsigned long) a_tv + 1, errstr);
#endif
/*
* Start with a nice simple select with the same set.
*/
for (int i = nfds; i <= smallset_size; ++i) {
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
XSELECT(1, i, a_rs, a_rs, a_rs, 0);
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], [%d %d], NULL) = 1 ()\n",
TEST_SYSCALL_STR, i, fds[0], fds[1],
fds[0], fds[1], fds[0], fds[1]);
#else
*l_rs = (1UL << fds[0]) | (1UL << fds[1]) |
(1UL << PATH_TRACING_FD);
XSELECT(i > PATH_TRACING_FD ? 3 : 1, i, a_rs, a_rs, a_rs, 0);
if (i > PATH_TRACING_FD) {
printf("%s(%d, [%d %d %d], [%d %d %d], [%d %d %d]"
", NULL) = 3 ()\n",
TEST_SYSCALL_STR, i,
fds[0], fds[1], PATH_TRACING_FD,
fds[0], fds[1], PATH_TRACING_FD,
fds[0], fds[1], PATH_TRACING_FD);
}
#endif
}
/*
* Odd timeout.
*/
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
tv_in.tv_sec = 0xdeadbeefU;
tv_in.tv_usec = 0xfacefeedU;
memcpy(tv, &tv_in, sizeof(tv_in));
rc = xselect(nfds, a_rs, a_rs, a_rs, a_tv);
if (rc < 0) {
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], [%d %d]"
", {tv_sec=%lld, tv_usec=%llu}) = %s\n",
TEST_SYSCALL_STR, nfds, fds[0], fds[1],
fds[0], fds[1], fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
errstr);
#endif /* !PATH_TRACING_FD */
} else {
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], [%d %d]"
", {tv_sec=%lld, tv_usec=%llu}) = %ld"
" (left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, nfds, fds[0], fds[1],
fds[0], fds[1], fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
rc, (long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
#endif /* !PATH_TRACING_FD */
}
/*
* Very odd timeout.
*/
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
tv_in.tv_sec = (time_t) 0xcafef00ddeadbeefLL;
tv_in.tv_usec = (suseconds_t) 0xbadc0dedfacefeedLL;
memcpy(tv, &tv_in, sizeof(tv_in));
rc = xselect(nfds, a_rs, a_rs, a_rs, a_tv);
if (rc < 0) {
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], [%d %d]"
", {tv_sec=%lld, tv_usec=%llu}) = %s\n",
TEST_SYSCALL_STR, nfds, fds[0], fds[1],
fds[0], fds[1], fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
errstr);
#endif /* PATH_TRACING_FD */
} else {
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], [%d %d]"
", {tv_sec=%lld, tv_usec=%llu}) = %ld"
" (left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, nfds, fds[0], fds[1],
fds[0], fds[1], fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
rc, (long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
#endif /* PATH_TRACING_FD */
}
/*
* Another simple one, with a timeout.
*/
for (int i = nfds; i <= smallset_size; ++i) {
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
*l_ws = (1UL << 1) | (1UL << 2) |
(1UL << fds[0]) | (1UL << fds[1]);
*l_es = 0;
tv_in.tv_sec = 0xc0de1;
tv_in.tv_usec = 0xc0de2;
memcpy(tv, &tv_in, sizeof(tv_in));
XSELECT(3, i, a_rs, a_ws, a_es, a_tv);
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d %d %d], []"
", {tv_sec=%lld, tv_usec=%llu}) = 3 (out [1 2 %d]"
", left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, i, fds[0], fds[1],
1, 2, fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
fds[1],
(long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
#else
*l_rs = (1UL << fds[0]) | (1UL << fds[1]) |
(1UL << PATH_TRACING_FD);
*l_ws = (1UL << 1) | (1UL << 2) |
(1UL << fds[0]) | (1UL << fds[1]);
tv_in.tv_sec = 0xc0de1;
tv_in.tv_usec = 0xc0de2;
memcpy(tv, &tv_in, sizeof(tv_in));
XSELECT(3 + (i > PATH_TRACING_FD), i, a_rs, a_ws, a_es, a_tv);
if (i > PATH_TRACING_FD) {
printf("%s(%d, [%d %d %d], [%d %d %d %d], []"
", {tv_sec=%lld, tv_usec=%llu})"
" = 4 (in [%d], out [1 2 %d]"
", left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, i,
fds[0], fds[1], PATH_TRACING_FD,
1, 2, fds[0], fds[1],
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
PATH_TRACING_FD, fds[1],
(long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
}
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
*l_ws = (1UL << 1) | (1UL << 2) |
(1UL << fds[0]) | (1UL << fds[1]) |
(1UL << PATH_TRACING_FD);
tv_in.tv_sec = 0xc0de1;
tv_in.tv_usec = 0xc0de2;
memcpy(tv, &tv_in, sizeof(tv_in));
XSELECT(3 + (i > PATH_TRACING_FD), i, a_rs, a_ws, a_es, a_tv);
if (i > PATH_TRACING_FD) {
printf("%s(%d, [%d %d], [%d %d %d %d %d], []"
", {tv_sec=%lld, tv_usec=%llu})"
" = 4 (out [1 2 %d %d]"
", left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, i,
fds[0], fds[1],
1, 2, fds[0], fds[1], PATH_TRACING_FD,
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
fds[1], PATH_TRACING_FD,
(long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
}
*l_rs = (1UL << fds[0]) | (1UL << fds[1]);
*l_ws = (1UL << 1) | (1UL << 2) |
(1UL << fds[0]) | (1UL << fds[1]);
*l_es = (1UL << PATH_TRACING_FD);
tv_in.tv_sec = 0xc0de1;
tv_in.tv_usec = 0xc0de2;
memcpy(tv, &tv_in, sizeof(tv_in));
XSELECT(3, i, a_rs, a_ws, a_es, a_tv);
if (i > PATH_TRACING_FD) {
printf("%s(%d, [%d %d], [%d %d %d %d], [%d]"
", {tv_sec=%lld, tv_usec=%llu}) = 3 (out [1 2 %d]"
", left {tv_sec=%lld, tv_usec=%llu})\n",
TEST_SYSCALL_STR, i,
fds[0], fds[1],
1, 2, fds[0], fds[1], PATH_TRACING_FD,
(long long) tv_in.tv_sec,
zero_extend_signed_to_ull(tv_in.tv_usec),
fds[1],
(long long) tv->tv_sec,
zero_extend_signed_to_ull(tv->tv_usec));
}
#endif /* PATH_TRACING_FD */
}
/*
* Now the crash case that trinity found, negative nfds
* but with a pointer to a large chunk of valid memory.
*/
static fd_set set[0x1000000 / sizeof(fd_set)];
FD_SET(fds[1], set);
XSELECT(-1, -1U, 0, (uintptr_t) set, 0, 0);
#ifndef PATH_TRACING_FD
printf("%s(-1, NULL, %p, NULL, NULL) = %s\n",
TEST_SYSCALL_STR, set, errstr);
#endif
/*
* Big sets, nfds exceeds FD_SETSIZE limit.
*/
const size_t big_size = sizeof(fd_set) + sizeof(long);
fd_set *const big_rs = tail_alloc(big_size);
const uintptr_t a_big_rs = (uintptr_t) big_rs;
fd_set *const big_ws = tail_alloc(big_size);
const uintptr_t a_big_ws = (uintptr_t) big_ws;
for (unsigned int i = FD_SETSIZE; i <= big_size * 8; ++i) {
memset(big_rs, 0, big_size);
memset(big_ws, 0, big_size);
FD_SET(fds[0], big_rs);
tv->tv_sec = 0;
tv->tv_usec = 10 + (i - FD_SETSIZE);
XSELECT(0, i, a_big_rs, a_big_ws, 0, a_tv);
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d], [], NULL, {tv_sec=0, tv_usec=%d})"
" = 0 (Timeout)\n",
TEST_SYSCALL_STR, i, fds[0], 10 + (i - FD_SETSIZE));
#else
FD_SET(fds[0], big_rs);
FD_SET(PATH_TRACING_FD, big_rs);
tv->tv_sec = 0;
tv->tv_usec = 10 + (i - FD_SETSIZE);
XSELECT(1, i, a_big_rs, a_big_ws, 0, a_tv);
printf("%s(%d, [%d %d], [], NULL, {tv_sec=0, tv_usec=%d})"
" = 1 (in [%d], left {tv_sec=0, tv_usec=%llu})\n",
TEST_SYSCALL_STR, i, fds[0], PATH_TRACING_FD,
10 + (i - FD_SETSIZE), PATH_TRACING_FD,
zero_extend_signed_to_ull(tv->tv_usec));
#endif /* PATH_TRACING_FD */
}
/*
* Huge sets, nfds equals to INT_MAX.
*/
FD_SET(fds[0], set);
FD_SET(fds[1], set);
tv->tv_sec = 0;
tv->tv_usec = 123;
XSELECT(0, INT_MAX, (uintptr_t) set, (uintptr_t) &set[1],
(uintptr_t) &set[2], a_tv);
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [], [], {tv_sec=0, tv_usec=123})"
" = 0 (Timeout)\n",
TEST_SYSCALL_STR, INT_MAX, fds[0], fds[1]);
#else
FD_SET(fds[0], set);
FD_SET(fds[1], set);
FD_SET(PATH_TRACING_FD, set);
tv->tv_sec = 0;
tv->tv_usec = 123;
XSELECT(1, INT_MAX, (uintptr_t) set, (uintptr_t) &set[1],
(uintptr_t) &set[2], a_tv);
printf("%s(%d, [%d %d %d], [], [], {tv_sec=0, tv_usec=123})"
" = 1 (in [%d], left {tv_sec=0, tv_usec=%llu})\n",
TEST_SYSCALL_STR, INT_MAX, fds[0], fds[1], PATH_TRACING_FD,
PATH_TRACING_FD, zero_extend_signed_to_ull(tv->tv_usec));
#endif /* PATH_TRACING_FD */
/*
* Small sets, nfds exceeds FD_SETSIZE limit.
* The kernel seems to be fine with it but strace cannot follow.
*/
*l_rs = (1UL << fds[0]) | (1UL << fds[1])
#ifdef PATH_TRACING_FD
| (1UL << PATH_TRACING_FD)
#endif
;
*l_ws = (1UL << fds[0]);
*l_es = (1UL << fds[0]) | (1UL << fds[1])
#ifdef PATH_TRACING_FD
| (1UL << PATH_TRACING_FD)
#endif
;
tv->tv_sec = 0;
tv->tv_usec = 123;
rc = xselect(FD_SETSIZE + 1, a_rs, a_ws, a_es, a_tv);
if (rc < 0) {
#ifndef PATH_TRACING_FD
printf("%s(%d, %p, %p, %p, {tv_sec=0, tv_usec=123}) = %s\n",
TEST_SYSCALL_STR, FD_SETSIZE + 1, rs, ws, es, errstr);
#endif
} else {
#ifndef PATH_TRACING_FD
printf("%s(%d, %p, %p, %p, {tv_sec=0, tv_usec=123})"
" = 0 (Timeout)\n",
TEST_SYSCALL_STR, FD_SETSIZE + 1, rs, ws, es);
#endif
}
/*
* Small sets, one of allocated descriptors exceeds smallset_size.
*/
if (dup2(fds[1], smallset_size) != smallset_size)
perror_msg_and_fail("dup2");
#ifdef PATH_TRACING_FD
FD_SET(PATH_TRACING_FD, rs);
FD_SET(PATH_TRACING_FD, ws);
FD_SET(PATH_TRACING_FD, es);
#endif
XSELECT(-1, smallset_size + 1, a_rs, a_ws, a_es, 0);
#ifndef PATH_TRACING_FD
printf("%s(%d, %p, %p, %p, NULL) = %s\n",
TEST_SYSCALL_STR, smallset_size + 1, rs, ws, es, errstr);
#endif
/*
* Small and big sets,
* one of allocated descriptors exceeds smallset_size.
*/
memset(big_rs, 0, big_size);
FD_SET(fds[0], big_rs);
FD_SET(smallset_size, big_rs);
memset(big_ws, 0, big_size);
FD_SET(fds[1], big_ws);
FD_SET(smallset_size, big_ws);
XSELECT(-1, smallset_size + 1, a_big_rs, a_big_ws, a_es, 0);
#ifndef PATH_TRACING_FD
printf("%s(%d, [%d %d], [%d %d], %p, NULL) = %s\n",
TEST_SYSCALL_STR, smallset_size + 1,
fds[0], smallset_size,
fds[1], smallset_size,
es, errstr);
#endif /* !PATH_TRACING_FD */
XSELECT(-1, smallset_size + 1, a_es, a_big_ws, a_big_rs, 0);
#ifndef PATH_TRACING_FD
printf("%s(%d, %p, [%d %d], [%d %d], NULL) = %s\n",
TEST_SYSCALL_STR, smallset_size + 1,
es,
fds[1], smallset_size,
fds[0], smallset_size,
errstr);
#endif /* !PATH_TRACING_FD */
puts("+++ exited with 0 +++");
return 0;
}
|
