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/*
* Check decoding of syslog syscall.
*
* Copyright (c) 2016-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <stdio.h>
#include <unistd.h>
#ifdef RETVAL_INJECTED
# define RET_SFX " (INJECTED)"
#else
# define RET_SFX ""
#endif
static bool
valid_cmd(int cmd)
{
return cmd >= 0 && cmd <= 10;
}
static void
printstr(const char *s, int cmd, long size)
{
if (size < 0 || !valid_cmd(cmd))
printf("%p", s);
else if (size == 0)
printf("\"\"");
else if (size <= DEFAULT_STRLEN)
print_quoted_memory(s, size);
else {
print_quoted_memory(s, DEFAULT_STRLEN);
printf("...");
}
}
int
main(void)
{
static const struct cmd_str {
unsigned int cmd;
const char *str;
} no_args[] = {
{ 0, "0 /* SYSLOG_ACTION_CLOSE */" },
{ 1, "1 /* SYSLOG_ACTION_OPEN */" },
#ifdef RETVAL_INJECTED
/* Avoid commands with side effects without syscall injection */
{ 5, "5 /* SYSLOG_ACTION_CLEAR */" },
{ 6, "6 /* SYSLOG_ACTION_CONSOLE_OFF */" },
{ 7, "7 /* SYSLOG_ACTION_CONSOLE_ON */" },
#endif
{ 9, "9 /* SYSLOG_ACTION_SIZE_UNREAD */" },
{ 10, "10 /* SYSLOG_ACTION_SIZE_BUFFER */" },
};
static const struct cmd_str two_args[] = {
{ 0xfeedbeef, "-17973521 /* SYSLOG_ACTION_??? */" },
{ -1U, "-1 /* SYSLOG_ACTION_??? */" },
#ifdef RETVAL_INJECTED
/* Avoid commands with side effects without syscall injection */
{ 2, "2 /* SYSLOG_ACTION_READ */" },
{ 3, "3 /* SYSLOG_ACTION_READ_ALL */" },
{ 4, "4 /* SYSLOG_ACTION_READ_CLEAR */" },
#endif
{ 11, "11 /* SYSLOG_ACTION_??? */" },
{ (1U << 31) - 1, "2147483647 /* SYSLOG_ACTION_??? */" },
};
static const struct cmd_str levels[] = {
{ 0xfeedbeef, "-17973521 /* LOGLEVEL_??? */" },
{ -1U, "-1 /* LOGLEVEL_??? */" },
{ 0, "0 /* LOGLEVEL_EMERG */" },
{ 7, "7 /* LOGLEVEL_DEBUG */" },
{ 8, "8 /* LOGLEVEL_DEBUG+1 */" },
{ 9, "9 /* LOGLEVEL_??? */" },
{ (1U << 31) - 1, "2147483647 /* LOGLEVEL_??? */" },
};
static const kernel_ulong_t high =
(kernel_ulong_t) 0xbadc0ded00000000ULL;
static const size_t buf_size = 64;
const kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
int rc;
char *buf = tail_alloc(buf_size);
fill_memory(buf, buf_size);
for (size_t i = 0; i < ARRAY_SIZE(no_args); i++) {
rc = syscall(__NR_syslog, high | no_args[i].cmd, addr, -1);
printf("syslog(%s) = %s" RET_SFX "\n",
no_args[i].str, sprintrc(rc));
}
for (size_t i = 0; i < ARRAY_SIZE(two_args); i++) {
rc = syscall(__NR_syslog, high | two_args[i].cmd, NULL, -1);
printf("syslog(%s, NULL, -1) = %s" RET_SFX "\n",
two_args[i].str, sprintrc(rc));
#ifdef RETVAL_INJECTED
/* Avoid valid commands with a bogus address */
if (!valid_cmd(two_args[i].cmd))
#endif
{
rc = syscall(__NR_syslog, high | two_args[i].cmd, addr,
-1);
printf("syslog(%s, %#llx, -1) = %s" RET_SFX "\n",
two_args[i].str, (unsigned long long) addr,
sprintrc(rc));
rc = syscall(__NR_syslog, two_args[i].cmd, addr, 0);
printf("syslog(%s, %s, 0) = %s" RET_SFX "\n",
two_args[i].str,
!rc && valid_cmd(two_args[i].cmd)
&& (sizeof(kernel_ulong_t) == sizeof(void *))
? "\"\""
: (sizeof(addr) == 8)
? "0xfacefeeddeadbeef" : "0xdeadbeef",
sprintrc(rc));
}
rc = syscall(__NR_syslog, two_args[i].cmd, buf, buf_size);
const char *errstr = sprintrc(rc);
printf("syslog(%s, ", two_args[i].str);
if (rc >= 0 && valid_cmd(two_args[i].cmd))
printstr(buf, two_args[i].cmd, rc);
else
printf("%p", buf);
printf(", %zu) = %s" RET_SFX "\n", buf_size, errstr);
}
for (size_t i = 0; i < ARRAY_SIZE(levels); i++) {
rc = syscall(__NR_syslog, high | 8, addr, levels[i].cmd);
printf("syslog(8 /* SYSLOG_ACTION_CONSOLE_LEVEL */, %#llx, %s)"
" = %s" RET_SFX "\n",
(unsigned long long) addr, levels[i].str, sprintrc(rc));
}
puts("+++ exited with 0 +++");
return 0;
}
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