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/*
* Check decoding of pread64 and pwrite64 syscalls.
*
* Copyright (c) 2016 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2016-2023 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void
dump_str(const char *str, const unsigned int len)
{
static const char dots[16] = "................";
for (unsigned int i = 0; i < len; i += 16) {
unsigned int n = len - i > 16 ? 16 : len - i;
const char *dump = hexdump_memdup(str + i, n);
tprintf(" | %05x %-49s %-16.*s |\n",
i, dump, n, dots);
free((void *) dump);
}
}
static void
print_hex(const char *str, const unsigned int len)
{
const unsigned char *ustr = (const unsigned char *) str;
for (unsigned int i = 0; i < len; ++i) {
unsigned int c = ustr[i];
switch (c) {
case '\t':
tprintf("\\t"); break;
case '\n':
tprintf("\\n"); break;
case '\v':
tprintf("\\v"); break;
case '\f':
tprintf("\\f"); break;
case '\r':
tprintf("\\r"); break;
default:
tprintf("\\%o", ustr[i]);
}
}
}
static void
test_dump(const unsigned int len)
{
static char *buf;
if (buf) {
size_t ps1 = get_page_size() - 1;
buf = (void *) (((size_t) buf + ps1) & ~ps1) - len;
} else {
buf = tail_alloc(len);
}
const off_t offset = 0xdefaceddeadbeefLL + len;
long rc = pread(0, buf, len, offset);
if (rc != (int) len)
perror_msg_and_fail("pread64: expected %d, returned %ld",
len, rc);
tprintf("%s(%d, \"", "pread64", 0);
print_hex(buf, len);
tprintf("\", %d, %lld) = %ld\n", len, (long long) offset, rc);
dump_str(buf, len);
for (unsigned int i = 0; i < len; ++i)
buf[i] = i;
rc = pwrite(1, buf, len, offset);
if (rc != (int) len)
perror_msg_and_fail("pwrite64: expected %d, returned %ld",
len, rc);
tprintf("%s(%d, \"", "pwrite64", 1);
print_hex(buf, len);
tprintf("\", %d, %lld) = %ld\n", len, (long long) offset, rc);
dump_str(buf, len);
if (!len)
buf = 0;
}
int
main(void)
{
tprintf("%s", "");
skip_if_unavailable("/proc/self/fd/");
static const char tmp[] = "pread64-pwrite64-tmpfile";
if (open(tmp, O_CREAT|O_RDONLY|O_TRUNC, 0600) != 0)
perror_msg_and_fail("creat: %s", tmp);
if (open(tmp, O_WRONLY) != 1)
perror_msg_and_fail("open: %s", tmp);
char *nil = tail_alloc(1);
*nil = '\0';
static const char w_c[] = "0123456789abcde";
const unsigned int w_len = LENGTH_OF(w_c);
const char *w_d = hexdump_strdup(w_c);
const void *w = tail_memdup(w_c, w_len);
static const char r0_c[] = "01234567";
const char *r0_d = hexdump_strdup(r0_c);
const unsigned int r0_len = (w_len + 1) / 2;
void *r0 = tail_alloc(r0_len);
static const char r1_c[] = "89abcde";
const char *r1_d = hexdump_strdup(r1_c);
const unsigned int r1_len = w_len - r0_len;
void *r1 = tail_alloc(w_len);
void *efault = r1 - get_page_size();
long rc;
rc = pwrite(1, w, 0, 0);
if (rc)
perror_msg_and_fail("pwrite64: expected 0, returned %ld", rc);
tprintf("pwrite64(1, \"\", 0, 0) = 0\n");
rc = pwrite(1, efault, 1, 0);
if (rc != -1)
perror_msg_and_fail("pwrite64: expected -1 EFAULT"
", returned %ld", rc);
tprintf("pwrite64(1, %p, 1, 0)" RVAL_EFAULT, efault);
rc = pwrite(1, nil, 1, -3);
if (rc != -1)
perror_msg_and_fail("pwrite64: expected -1, returned %ld", rc);
tprintf("pwrite64(1, \"\\0\", 1, -3)" RVAL_EINVAL);
dump_str(nil, 1);
rc = pwrite(1, w, w_len, 0);
if (rc != (int) w_len)
perror_msg_and_fail("pwrite64: expected %u, returned %ld",
w_len, rc);
tprintf("pwrite64(1, \"%s\", %u, 0) = %ld\n"
" | 00000 %-49s %-16s |\n",
w_c, w_len, rc, w_d, w_c);
close(1);
rc = pread(0, r0, 0, 0);
if (rc)
perror_msg_and_fail("pread64: expected 0, returned %ld", rc);
tprintf("pread64(0, \"\", 0, 0) = 0\n");
rc = pread(0, efault, 1, 0);
if (rc != -1)
perror_msg_and_fail("pread64: expected -1, returned %ld", rc);
tprintf("pread64(0, %p, 1, 0)" RVAL_EFAULT, efault);
rc = pread(0, efault, 2, -7);
if (rc != -1)
perror_msg_and_fail("pread64: expected -1, returned %ld", rc);
tprintf("pread64(0, %p, 2, -7)" RVAL_EINVAL, efault);
rc = pread(0, r0, r0_len, 0);
if (rc != (int) r0_len)
perror_msg_and_fail("pread64: expected %u, returned %ld",
r0_len, rc);
tprintf("pread64(0, \"%s\", %u, 0) = %ld\n"
" | 00000 %-49s %-16s |\n",
r0_c, r0_len, rc, r0_d, r0_c);
rc = pread(0, r1, w_len, r0_len);
if (rc != (int) r1_len)
perror_msg_and_fail("pread64: expected %u, returned %ld",
r1_len, rc);
tprintf("pread64(0, \"%s\", %u, %u) = %ld\n"
" | 00000 %-49s %-16s |\n",
r1_c, w_len, r0_len, rc, r1_d, r1_c);
close(0);
if (open("/dev/zero", O_RDONLY))
perror_msg_and_fail("open");
if (open("/dev/null", O_WRONLY) != 1)
perror_msg_and_fail("open");
for (unsigned int i = 0; i <= 32; ++i)
test_dump(i);
tprintf("+++ exited with 0 +++\n");
return 0;
}
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