{ "KVMKVMKVM", VIRTUALIZATION_KVM },
/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
{ "VMwareVMware", VIRTUALIZATION_VMWARE },
- /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
+ /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
/* https://wiki.freebsd.org/bhyve */
{ "bhyve bhyve ", VIRTUALIZATION_BHYVE },
/* Returns a short identifier for the various VM implementations */
int detect_vm(void) {
static thread_local int cached_found = _VIRTUALIZATION_INVALID;
- int r;
+ int r, dmi;
if (cached_found >= 0)
return cached_found;
/* We have to use the correct order here:
- * Some virtualization technologies do use KVM hypervisor but are
- * expected to be detected as something else. So detect DMI first.
*
- * An example is Virtualbox since version 5.0, which uses KVM backend.
- * Detection via DMI works corretly, the CPU ID would find KVM
- * only. */
- r = detect_vm_dmi();
+ * -> First try to detect Oracle Virtualbox, even if it uses KVM.
+ * -> Second try to detect from cpuid, this will report KVM for
+ * whatever software is used even if info in dmi is overwritten.
+ * -> Third try to detect from dmi. */
+
+ dmi = detect_vm_dmi();
+ if (dmi == VIRTUALIZATION_ORACLE) {
+ r = dmi;
+ goto finish;
+ }
+
+ r = detect_vm_cpuid();
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)
goto finish;
- r = detect_vm_cpuid();
+ r = dmi;
if (r < 0)
return r;
if (r != VIRTUALIZATION_NONE)
if (cached_found >= 0)
return cached_found;
- /* /proc/vz exists in container and outside of the container,
- * /proc/bc only outside of the container. */
+ /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */
if (access("/proc/vz", F_OK) >= 0 &&
access("/proc/bc", F_OK) < 0) {
r = VIRTUALIZATION_OPENVZ;
}
if (getpid() == 1) {
- /* If we are PID 1 we can just check our own
- * environment variable */
+ /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */
e = getenv("container");
if (isempty(e)) {
r = VIRTUALIZATION_NONE;
goto finish;
}
- } else {
-
- /* Otherwise, PID 1 dropped this information into a
- * file in /run. This is better than accessing
- * /proc/1/environ, since we don't need CAP_SYS_PTRACE
- * for that. */
-
- r = read_one_line_file("/run/systemd/container", &m);
- if (r == -ENOENT) {
-
- /* Fallback for cases where PID 1 was not
- * systemd (for example, cases where
- * init=/bin/sh is used. */
-
- r = getenv_for_pid(1, "container", &m);
- if (r <= 0) {
-
- /* If that didn't work, give up,
- * assume no container manager.
- *
- * Note: This means we still cannot
- * detect containers if init=/bin/sh
- * is passed but privileges dropped,
- * as /proc/1/environ is only readable
- * with privileges. */
-
- r = VIRTUALIZATION_NONE;
- goto finish;
- }
- }
- if (r < 0)
- return r;
+ goto translate_name;
+ }
+
+ /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing
+ * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */
+ r = read_one_line_file("/run/systemd/container", &m);
+ if (r >= 0) {
+ e = m;
+ goto translate_name;
+ }
+ if (r != -ENOENT)
+ return log_debug_errno(r, "Failed to read /run/systemd/container: %m");
+
+ /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */
+ r = getenv_for_pid(1, "container", &m);
+ if (r > 0) {
e = m;
+ goto translate_name;
}
+ if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */
+ log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m");
+
+ /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown
+ * there is not 1, we know we are in a PID namespace. and hence a container. */
+ r = read_one_line_file("/proc/1/sched", &m);
+ if (r >= 0) {
+ const char *t;
+
+ t = strrchr(m, '(');
+ if (!t)
+ return -EIO;
+ if (!startswith(t, "(1,")) {
+ r = VIRTUALIZATION_CONTAINER_OTHER;
+ goto finish;
+ }
+ } else if (r != -ENOENT)
+ return r;
+
+ /* If that didn't work, give up, assume no container manager. */
+ r = VIRTUALIZATION_NONE;
+ goto finish;
+
+translate_name:
for (j = 0; j < ELEMENTSOF(value_table); j++)
if (streq(e, value_table[j].value)) {
r = value_table[j].id;
r = VIRTUALIZATION_CONTAINER_OTHER;
finish:
- log_debug("Found container virtualization %s", virtualization_to_string(r));
+ log_debug("Found container virtualization %s.", virtualization_to_string(r));
cached_found = r;
return r;
}
f = fopen(name, "re");
if (!f) {
log_debug_errno(errno, "Failed to open %s: %m", name);
- return errno == -ENOENT ? false : -errno;
+ return errno == ENOENT ? false : -errno;
}
n = getline(&buf, &n_allocated, f);
#endif // 0
int running_in_chroot(void) {
- int ret;
+ _cleanup_free_ char *self_mnt = NULL, *pid1_mnt = NULL;
+ int r;
+
+ /* Try to detect whether we are running in a chroot() environment. Specifically, check whether we have a
+ * different root directory than PID 1, even though we live in the same mount namespace as it. */
#if 0 /// elogind does not allow to ignore chroots, we are never init!
if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
return 0;
#endif // 0
- ret = files_same("/proc/1/root", "/");
- if (ret < 0)
- return ret;
+ r = files_same("/proc/1/root", "/");
+ if (r < 0)
+ return r;
+ if (r > 0)
+ return 0;
+
+ r = readlink_malloc("/proc/self/ns/mnt", &self_mnt);
+ if (r < 0)
+ return r;
+
+ r = readlink_malloc("/proc/1/ns/mnt", &pid1_mnt);
+ if (r < 0)
+ return r;
- return ret == 0;
+ return streq(self_mnt, pid1_mnt); /* Only if we live in the same namespace! */
}
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
~ianmdlvl / elogind.git / blobdiff