1 files changed, 98 insertions, 0 deletions
diff --git a/tests/qemu.h b/tests/qemu.h
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+/* Determine whether the current process is running under QEMU.
+   Copyright (C) 2021-2024 Free Software Foundation, Inc.
+
+   This file is free software: you can redistribute it and/or modify
+   it under the terms of the GNU Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2021.  */
+
+#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;
+}