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/* Determine whether the current process is running under QEMU.
Copyright (C) 2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2021. */
#include <stdbool.h>
#ifdef __linux__
# include <fcntl.h>
# include <string.h>
# include <unistd.h>
#endif
/* This function determines whether the current process is running under QEMU
(user-mode).
It does so by looking at parts of the environment that QEMU does not emulate
100% perfectly well.
For comparison, the techniques given in the paper
Thomas Raffetseder, Christopher Kruegel, Engin Kirda
"Detecting System Emulators"
2007
https://publik.tuwien.ac.at/files/pub-inf_5317.pdf
apply to both the QEMU system mode and QEMU user mode. */
static bool
is_running_under_qemu_user (void)
{
#ifdef __linux__
char buf[4096 + 1];
int fd;
# if defined __m68k__
fd = open ("/proc/hardware", O_RDONLY);
if (fd >= 0)
{
int n = read (fd, buf, sizeof (buf) - 1);
close (fd);
if (n > 0)
{
buf[n] = '\0';
if (strstr (buf, "qemu") != NULL)
return true;
}
}
# endif
fd = open ("/proc/cpuinfo", O_RDONLY);
if (fd >= 0)
{
int n = read (fd, buf, sizeof (buf) - 1);
close (fd);
if (n > 0)
{
buf[n] = '\0';
# if defined __hppa__
if (strstr (buf, "QEMU") != NULL)
return true;
# endif
# if !(defined __i386__ || defined __x86_64__)
if (strstr (buf, "AuthenticAMD") != NULL
|| strstr (buf, "GenuineIntel") != NULL)
return true;
# endif
# if !(defined __arm__ || defined __aarch64__)
if (strstr (buf, "ARM") != NULL
|| strcasestr (buf, "aarch64") != NULL)
return true;
# endif
# if !defined __sparc__
if (strcasestr (buf, "SPARC") != NULL)
return true;
# endif
# if !defined __powerpc__
if (strstr (buf, "POWER") != NULL)
return true;
# endif
}
}
/* If you need more heuristics, look at system calls that are not perfectly
well emulated in qemu/linux-user/syscall.c. */
#endif
return false;
}
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