| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #if defined(__i386__) || defined(__x86_64__) |
| #include <cpuid.h> |
| #endif |
| #include <errno.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "cgroup-util.h" |
| #include "dirent-util.h" |
| #include "env-util.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "macro.h" |
| #include "process-util.h" |
| #include "stat-util.h" |
| #include "string-table.h" |
| #include "string-util.h" |
| #include "virt.h" |
| |
| enum { |
| SMBIOS_VM_BIT_SET, |
| SMBIOS_VM_BIT_UNSET, |
| SMBIOS_VM_BIT_UNKNOWN, |
| }; |
| |
| #if defined(__i386__) || defined(__x86_64__) |
| static const char *const vm_table[_VIRTUALIZATION_MAX] = { |
| [VIRTUALIZATION_XEN] = "XenVMMXenVMM", |
| [VIRTUALIZATION_KVM] = "KVMKVMKVM", |
| [VIRTUALIZATION_QEMU] = "TCGTCGTCGTCG", |
| /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
| [VIRTUALIZATION_VMWARE] = "VMwareVMware", |
| /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ |
| [VIRTUALIZATION_MICROSOFT] = "Microsoft Hv", |
| /* https://wiki.freebsd.org/bhyve */ |
| [VIRTUALIZATION_BHYVE] = "bhyve bhyve ", |
| [VIRTUALIZATION_QNX] = "QNXQVMBSQG", |
| /* https://projectacrn.org */ |
| [VIRTUALIZATION_ACRN] = "ACRNACRNACRN", |
| }; |
| |
| DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(vm, int); |
| #endif |
| |
| static int detect_vm_cpuid(void) { |
| |
| /* CPUID is an x86 specific interface. */ |
| #if defined(__i386__) || defined(__x86_64__) |
| |
| uint32_t eax, ebx, ecx, edx; |
| bool hypervisor; |
| |
| /* http://lwn.net/Articles/301888/ */ |
| |
| /* First detect whether there is a hypervisor */ |
| if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0) |
| return VIRTUALIZATION_NONE; |
| |
| hypervisor = ecx & 0x80000000U; |
| |
| if (hypervisor) { |
| union { |
| uint32_t sig32[3]; |
| char text[13]; |
| } sig = {}; |
| int v; |
| |
| /* There is a hypervisor, see what it is */ |
| __cpuid(0x40000000U, eax, ebx, ecx, edx); |
| |
| sig.sig32[0] = ebx; |
| sig.sig32[1] = ecx; |
| sig.sig32[2] = edx; |
| |
| log_debug("Virtualization found, CPUID=%s", sig.text); |
| |
| v = vm_from_string(sig.text); |
| if (v < 0) |
| return VIRTUALIZATION_VM_OTHER; |
| |
| return v; |
| } |
| #endif |
| log_debug("No virtualization found in CPUID"); |
| |
| return VIRTUALIZATION_NONE; |
| } |
| |
| static int detect_vm_device_tree(void) { |
| #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
| _cleanup_free_ char *hvtype = NULL; |
| int r; |
| |
| r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
| if (r == -ENOENT) { |
| _cleanup_closedir_ DIR *dir = NULL; |
| struct dirent *dent; |
| |
| if (access("/proc/device-tree/ibm,partition-name", F_OK) == 0 && |
| access("/proc/device-tree/hmc-managed?", F_OK) == 0 && |
| access("/proc/device-tree/chosen/qemu,graphic-width", F_OK) != 0) |
| return VIRTUALIZATION_POWERVM; |
| |
| dir = opendir("/proc/device-tree"); |
| if (!dir) { |
| if (errno == ENOENT) { |
| log_debug_errno(errno, "/proc/device-tree: %m"); |
| return VIRTUALIZATION_NONE; |
| } |
| return -errno; |
| } |
| |
| FOREACH_DIRENT(dent, dir, return -errno) |
| if (strstr(dent->d_name, "fw-cfg")) { |
| log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); |
| return VIRTUALIZATION_QEMU; |
| } |
| |
| log_debug("No virtualization found in /proc/device-tree/*"); |
| return VIRTUALIZATION_NONE; |
| } else if (r < 0) |
| return r; |
| |
| log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
| if (streq(hvtype, "linux,kvm")) |
| return VIRTUALIZATION_KVM; |
| else if (strstr(hvtype, "xen")) |
| return VIRTUALIZATION_XEN; |
| else if (strstr(hvtype, "vmware")) |
| return VIRTUALIZATION_VMWARE; |
| else |
| return VIRTUALIZATION_VM_OTHER; |
| #else |
| log_debug("This platform does not support /proc/device-tree"); |
| return VIRTUALIZATION_NONE; |
| #endif |
| } |
| |
| #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
| static int detect_vm_dmi_vendor(void) { |
| static const char *const dmi_vendors[] = { |
| "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
| "/sys/class/dmi/id/sys_vendor", |
| "/sys/class/dmi/id/board_vendor", |
| "/sys/class/dmi/id/bios_vendor", |
| "/sys/class/dmi/id/product_version" /* For Hyper-V VMs test */ |
| }; |
| |
| static const struct { |
| const char *vendor; |
| int id; |
| } dmi_vendor_table[] = { |
| { "KVM", VIRTUALIZATION_KVM }, |
| { "Amazon EC2", VIRTUALIZATION_AMAZON }, |
| { "QEMU", VIRTUALIZATION_QEMU }, |
| { "VMware", VIRTUALIZATION_VMWARE }, /* https://kb.vmware.com/s/article/1009458 */ |
| { "VMW", VIRTUALIZATION_VMWARE }, |
| { "innotek GmbH", VIRTUALIZATION_ORACLE }, |
| { "VirtualBox", VIRTUALIZATION_ORACLE }, |
| { "Xen", VIRTUALIZATION_XEN }, |
| { "Bochs", VIRTUALIZATION_BOCHS }, |
| { "Parallels", VIRTUALIZATION_PARALLELS }, |
| /* https://wiki.freebsd.org/bhyve */ |
| { "BHYVE", VIRTUALIZATION_BHYVE }, |
| { "Hyper-V", VIRTUALIZATION_MICROSOFT }, |
| }; |
| int r; |
| |
| for (size_t i = 0; i < ELEMENTSOF(dmi_vendors); i++) { |
| _cleanup_free_ char *s = NULL; |
| unsigned j; |
| |
| r = read_one_line_file(dmi_vendors[i], &s); |
| if (r < 0) { |
| if (r == -ENOENT) |
| continue; |
| |
| return r; |
| } |
| |
| for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
| if (startswith(s, dmi_vendor_table[j].vendor)) { |
| log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); |
| return dmi_vendor_table[j].id; |
| } |
| } |
| log_debug("No virtualization found in DMI vendor table."); |
| return VIRTUALIZATION_NONE; |
| } |
| |
| static int detect_vm_smbios(void) { |
| /* The SMBIOS BIOS Charateristics Extension Byte 2 (Section 2.1.2.2 of |
| * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.4.0.pdf), specifies that |
| * the 4th bit being set indicates a VM. The BIOS Characteristics table is exposed via the kernel in |
| * /sys/firmware/dmi/entries/0-0. Note that in the general case, this bit being unset should not |
| * imply that the system is running on bare-metal. For example, QEMU 3.1.0 (with or without KVM) |
| * with SeaBIOS does not set this bit. */ |
| _cleanup_free_ char *s = NULL; |
| size_t readsize; |
| int r; |
| |
| r = read_full_virtual_file("/sys/firmware/dmi/entries/0-0/raw", &s, &readsize); |
| if (r < 0) { |
| log_debug_errno(r, "Unable to read /sys/firmware/dmi/entries/0-0/raw, " |
| "using the virtualization information found in DMI vendor table, ignoring: %m"); |
| return SMBIOS_VM_BIT_UNKNOWN; |
| } |
| if (readsize < 20 || s[1] < 20) { |
| /* The spec indicates that byte 1 contains the size of the table, 0x12 + the number of |
| * extension bytes. The data we're interested in is in extension byte 2, which would be at |
| * 0x13. If we didn't read that much data, or if the BIOS indicates that we don't have that |
| * much data, we don't infer anything from the SMBIOS. */ |
| log_debug("Only read %zu bytes from /sys/firmware/dmi/entries/0-0/raw (expected 20). " |
| "Using the virtualization information found in DMI vendor table.", readsize); |
| return SMBIOS_VM_BIT_UNKNOWN; |
| } |
| |
| uint8_t byte = (uint8_t) s[19]; |
| if (byte & (1U<<4)) { |
| log_debug("DMI BIOS Extension table indicates virtualization."); |
| return SMBIOS_VM_BIT_SET; |
| } |
| log_debug("DMI BIOS Extension table does not indicate virtualization."); |
| return SMBIOS_VM_BIT_UNSET; |
| } |
| #endif /* defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) */ |
| |
| static int detect_vm_dmi(void) { |
| #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
| |
| int r; |
| r = detect_vm_dmi_vendor(); |
| |
| /* The DMI vendor tables in /sys/class/dmi/id don't help us distinguish between Amazon EC2 |
| * virtual machines and bare-metal instances, so we need to look at SMBIOS. */ |
| if (r == VIRTUALIZATION_AMAZON) { |
| switch (detect_vm_smbios()) { |
| case SMBIOS_VM_BIT_SET: |
| return VIRTUALIZATION_AMAZON; |
| case SMBIOS_VM_BIT_UNSET: |
| return VIRTUALIZATION_NONE; |
| case SMBIOS_VM_BIT_UNKNOWN: { |
| /* The DMI information we are after is only accessible to the root user, |
| * so we fallback to using the product name which is less restricted |
| * to distinguish metal systems from virtualized instances */ |
| _cleanup_free_ char *s = NULL; |
| |
| r = read_full_virtual_file("/sys/class/dmi/id/product_name", &s, NULL); |
| /* In EC2, virtualized is much more common than metal, so if for some reason |
| * we fail to read the DMI data, assume we are virtualized. */ |
| if (r < 0) { |
| log_debug_errno(r, "Can't read /sys/class/dmi/id/product_name," |
| " assuming virtualized: %m"); |
| return VIRTUALIZATION_AMAZON; |
| } |
| if (endswith(truncate_nl(s), ".metal")) { |
| log_debug("DMI product name ends with '.metal', assuming no virtualization"); |
| return VIRTUALIZATION_NONE; |
| } else |
| return VIRTUALIZATION_AMAZON; |
| } |
| default: |
| assert_not_reached("Bad virtualization value"); |
| } |
| } |
| |
| /* If we haven't identified a VM, but the firmware indicates that there is one, indicate as much. We |
| * have no further information about what it is. */ |
| if (r == VIRTUALIZATION_NONE && detect_vm_smbios() == SMBIOS_VM_BIT_SET) |
| return VIRTUALIZATION_VM_OTHER; |
| return r; |
| #else |
| return VIRTUALIZATION_NONE; |
| #endif |
| } |
| |
| static int detect_vm_xen(void) { |
| |
| /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
| The presence of /proc/xen indicates some form of a Xen domain */ |
| if (access("/proc/xen", F_OK) < 0) { |
| log_debug("Virtualization XEN not found, /proc/xen does not exist"); |
| return VIRTUALIZATION_NONE; |
| } |
| |
| log_debug("Virtualization XEN found (/proc/xen exists)"); |
| return VIRTUALIZATION_XEN; |
| } |
| |
| #define XENFEAT_dom0 11 /* xen/include/public/features.h */ |
| #define PATH_FEATURES "/sys/hypervisor/properties/features" |
| /* Returns -errno, or 0 for domU, or 1 for dom0 */ |
| static int detect_vm_xen_dom0(void) { |
| _cleanup_free_ char *domcap = NULL; |
| int r; |
| |
| r = read_one_line_file(PATH_FEATURES, &domcap); |
| if (r < 0 && r != -ENOENT) |
| return r; |
| if (r >= 0) { |
| unsigned long features; |
| |
| /* Here, we need to use sscanf() instead of safe_atoul() |
| * as the string lacks the leading "0x". */ |
| r = sscanf(domcap, "%lx", &features); |
| if (r == 1) { |
| r = !!(features & (1U << XENFEAT_dom0)); |
| log_debug("Virtualization XEN, found %s with value %08lx, " |
| "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.", |
| PATH_FEATURES, features, r ? "" : " not"); |
| return r; |
| } |
| log_debug("Virtualization XEN, found %s, unhandled content '%s'", |
| PATH_FEATURES, domcap); |
| } |
| |
| r = read_one_line_file("/proc/xen/capabilities", &domcap); |
| if (r == -ENOENT) { |
| log_debug("Virtualization XEN because /proc/xen/capabilities does not exist"); |
| return 0; |
| } |
| if (r < 0) |
| return r; |
| |
| for (const char *i = domcap;;) { |
| _cleanup_free_ char *cap = NULL; |
| |
| r = extract_first_word(&i, &cap, ",", 0); |
| if (r < 0) |
| return r; |
| if (r == 0) { |
| log_debug("Virtualization XEN DomU found (/proc/xen/capabilities)"); |
| return 0; |
| } |
| |
| if (streq(cap, "control_d")) { |
| log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); |
| return 1; |
| } |
| } |
| } |
| |
| static int detect_vm_hypervisor(void) { |
| _cleanup_free_ char *hvtype = NULL; |
| int r; |
| |
| r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
| if (r == -ENOENT) |
| return VIRTUALIZATION_NONE; |
| if (r < 0) |
| return r; |
| |
| log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
| |
| if (streq(hvtype, "xen")) |
| return VIRTUALIZATION_XEN; |
| else |
| return VIRTUALIZATION_VM_OTHER; |
| } |
| |
| static int detect_vm_uml(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| int r; |
| |
| /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
| f = fopen("/proc/cpuinfo", "re"); |
| if (!f) { |
| if (errno == ENOENT) { |
| log_debug("/proc/cpuinfo not found, assuming no UML virtualization."); |
| return VIRTUALIZATION_NONE; |
| } |
| return -errno; |
| } |
| |
| for (;;) { |
| _cleanup_free_ char *line = NULL; |
| const char *t; |
| |
| r = read_line(f, LONG_LINE_MAX, &line); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| |
| t = startswith(line, "vendor_id\t: "); |
| if (t) { |
| if (startswith(t, "User Mode Linux")) { |
| log_debug("UML virtualization found in /proc/cpuinfo"); |
| return VIRTUALIZATION_UML; |
| } |
| |
| break; |
| } |
| } |
| |
| log_debug("UML virtualization not found in /proc/cpuinfo."); |
| return VIRTUALIZATION_NONE; |
| } |
| |
| static int detect_vm_zvm(void) { |
| |
| #if defined(__s390__) |
| _cleanup_free_ char *t = NULL; |
| int r; |
| |
| r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
| if (r == -ENOENT) |
| return VIRTUALIZATION_NONE; |
| if (r < 0) |
| return r; |
| |
| log_debug("Virtualization %s found in /proc/sysinfo", t); |
| if (streq(t, "z/VM")) |
| return VIRTUALIZATION_ZVM; |
| else |
| return VIRTUALIZATION_KVM; |
| #else |
| log_debug("This platform does not support /proc/sysinfo"); |
| return VIRTUALIZATION_NONE; |
| #endif |
| } |
| |
| /* Returns a short identifier for the various VM implementations */ |
| int detect_vm(void) { |
| static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
| bool other = false; |
| int r, dmi; |
| |
| if (cached_found >= 0) |
| return cached_found; |
| |
| /* We have to use the correct order here: |
| * |
| * → First, try to detect Oracle Virtualbox and Amazon EC2 Nitro, even if they use KVM, as well as Xen even if |
| * it cloaks as Microsoft Hyper-V. Attempt to detect uml at this stage also since it runs as a user-process |
| * nested inside other VMs. |
| * |
| * → 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 (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN, VIRTUALIZATION_AMAZON)) { |
| r = dmi; |
| goto finish; |
| } |
| |
| /* Detect UML */ |
| r = detect_vm_uml(); |
| if (r < 0) |
| return r; |
| if (r == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (r != VIRTUALIZATION_NONE) |
| goto finish; |
| |
| /* Detect from CPUID */ |
| r = detect_vm_cpuid(); |
| if (r < 0) |
| return r; |
| if (r == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (r != VIRTUALIZATION_NONE) |
| goto finish; |
| |
| /* Now, let's get back to DMI */ |
| if (dmi < 0) |
| return dmi; |
| if (dmi == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (dmi != VIRTUALIZATION_NONE) { |
| r = dmi; |
| goto finish; |
| } |
| |
| /* x86 xen will most likely be detected by cpuid. If not (most likely |
| * because we're not an x86 guest), then we should try the /proc/xen |
| * directory next. If that's not found, then we check for the high-level |
| * hypervisor sysfs file. |
| */ |
| |
| r = detect_vm_xen(); |
| if (r < 0) |
| return r; |
| if (r == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (r != VIRTUALIZATION_NONE) |
| goto finish; |
| |
| r = detect_vm_hypervisor(); |
| if (r < 0) |
| return r; |
| if (r == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (r != VIRTUALIZATION_NONE) |
| goto finish; |
| |
| r = detect_vm_device_tree(); |
| if (r < 0) |
| return r; |
| if (r == VIRTUALIZATION_VM_OTHER) |
| other = true; |
| else if (r != VIRTUALIZATION_NONE) |
| goto finish; |
| |
| r = detect_vm_zvm(); |
| if (r < 0) |
| return r; |
| |
| finish: |
| /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
| * In order to detect the Dom0 as not virtualization we need to |
| * double-check it */ |
| if (r == VIRTUALIZATION_XEN) { |
| int dom0; |
| |
| dom0 = detect_vm_xen_dom0(); |
| if (dom0 < 0) |
| return dom0; |
| if (dom0 > 0) |
| r = VIRTUALIZATION_NONE; |
| } else if (r == VIRTUALIZATION_NONE && other) |
| r = VIRTUALIZATION_VM_OTHER; |
| |
| cached_found = r; |
| log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
| return r; |
| } |
| |
| static const char *const container_table[_VIRTUALIZATION_MAX] = { |
| [VIRTUALIZATION_LXC] = "lxc", |
| [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", |
| [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", |
| [VIRTUALIZATION_DOCKER] = "docker", |
| [VIRTUALIZATION_PODMAN] = "podman", |
| [VIRTUALIZATION_RKT] = "rkt", |
| [VIRTUALIZATION_WSL] = "wsl", |
| [VIRTUALIZATION_PROOT] = "proot", |
| [VIRTUALIZATION_POUCH] = "pouch", |
| }; |
| |
| DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(container, int); |
| |
| static int running_in_cgroupns(void) { |
| int r; |
| |
| if (!cg_ns_supported()) |
| return false; |
| |
| r = cg_all_unified(); |
| if (r < 0) |
| return r; |
| |
| if (r) { |
| /* cgroup v2 */ |
| |
| r = access("/sys/fs/cgroup/cgroup.events", F_OK); |
| if (r < 0) { |
| if (errno != ENOENT) |
| return -errno; |
| /* All kernel versions have cgroup.events in nested cgroups. */ |
| return false; |
| } |
| |
| /* There's no cgroup.type in the root cgroup, and future kernel versions |
| * are unlikely to add it since cgroup.type is something that makes no sense |
| * whatsoever in the root cgroup. */ |
| r = access("/sys/fs/cgroup/cgroup.type", F_OK); |
| if (r == 0) |
| return true; |
| if (r < 0 && errno != ENOENT) |
| return -errno; |
| |
| /* On older kernel versions, there's no cgroup.type */ |
| r = access("/sys/kernel/cgroup/features", F_OK); |
| if (r < 0) { |
| if (errno != ENOENT) |
| return -errno; |
| /* This is an old kernel that we know for sure has cgroup.events |
| * only in nested cgroups. */ |
| return true; |
| } |
| |
| /* This is a recent kernel, and cgroup.type doesn't exist, so we must be |
| * in the root cgroup. */ |
| return false; |
| } else { |
| /* cgroup v1 */ |
| |
| /* If systemd controller is not mounted, do not even bother. */ |
| r = access("/sys/fs/cgroup/systemd", F_OK); |
| if (r < 0) { |
| if (errno != ENOENT) |
| return -errno; |
| return false; |
| } |
| |
| /* release_agent only exists in the root cgroup. */ |
| r = access("/sys/fs/cgroup/systemd/release_agent", F_OK); |
| if (r < 0) { |
| if (errno != ENOENT) |
| return -errno; |
| return true; |
| } |
| |
| return false; |
| } |
| } |
| |
| static int detect_container_files(void) { |
| unsigned i; |
| |
| static const struct { |
| const char *file_path; |
| int id; |
| } container_file_table[] = { |
| /* https://github.com/containers/podman/issues/6192 */ |
| /* https://github.com/containers/podman/issues/3586#issuecomment-661918679 */ |
| { "/run/.containerenv", VIRTUALIZATION_PODMAN }, |
| /* https://github.com/moby/moby/issues/18355 */ |
| /* Docker must be the last in this table, see below. */ |
| { "/.dockerenv", VIRTUALIZATION_DOCKER }, |
| }; |
| |
| for (i = 0; i < ELEMENTSOF(container_file_table); i++) { |
| if (access(container_file_table[i].file_path, F_OK) >= 0) |
| return container_file_table[i].id; |
| |
| if (errno != ENOENT) |
| log_debug_errno(errno, |
| "Checking if %s exists failed, ignoring: %m", |
| container_file_table[i].file_path); |
| } |
| |
| return VIRTUALIZATION_NONE; |
| } |
| |
| int detect_container(void) { |
| static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
| _cleanup_free_ char *m = NULL, *o = NULL, *p = NULL; |
| const char *e = NULL; |
| int r; |
| |
| if (cached_found >= 0) |
| return cached_found; |
| |
| /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
| if (access("/proc/vz", F_OK) < 0) { |
| if (errno != ENOENT) |
| log_debug_errno(errno, "Failed to check if /proc/vz exists, ignoring: %m"); |
| } else if (access("/proc/bc", F_OK) < 0) { |
| if (errno == ENOENT) { |
| r = VIRTUALIZATION_OPENVZ; |
| goto finish; |
| } |
| |
| log_debug_errno(errno, "Failed to check if /proc/bc exists, ignoring: %m"); |
| } |
| |
| /* "Official" way of detecting WSL https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364 */ |
| r = read_one_line_file("/proc/sys/kernel/osrelease", &o); |
| if (r < 0) |
| log_debug_errno(r, "Failed to read /proc/sys/kernel/osrelease, ignoring: %m"); |
| else if (strstr(o, "Microsoft") || strstr(o, "WSL")) { |
| r = VIRTUALIZATION_WSL; |
| goto finish; |
| } |
| |
| /* proot doesn't use PID namespacing, so we can just check if we have a matching tracer for this |
| * invocation without worrying about it being elsewhere. |
| */ |
| r = get_proc_field("/proc/self/status", "TracerPid", WHITESPACE, &p); |
| if (r < 0) |
| log_debug_errno(r, "Failed to read our own trace PID, ignoring: %m"); |
| else if (!streq(p, "0")) { |
| pid_t ptrace_pid; |
| |
| r = parse_pid(p, &ptrace_pid); |
| if (r < 0) |
| log_debug_errno(r, "Failed to parse our own tracer PID, ignoring: %m"); |
| else { |
| _cleanup_free_ char *ptrace_comm = NULL; |
| const char *pf; |
| |
| pf = procfs_file_alloca(ptrace_pid, "comm"); |
| r = read_one_line_file(pf, &ptrace_comm); |
| if (r < 0) |
| log_debug_errno(r, "Failed to read %s, ignoring: %m", pf); |
| else if (startswith(ptrace_comm, "proot")) { |
| r = VIRTUALIZATION_PROOT; |
| goto finish; |
| } |
| } |
| } |
| |
| /* The container manager might have placed this in the /run/host/ hierarchy for us, which is best |
| * because we can be consumed just like that, without special privileges. */ |
| r = read_one_line_file("/run/host/container-manager", &m); |
| if (r > 0) { |
| e = m; |
| goto translate_name; |
| } |
| if (!IN_SET(r, -ENOENT, 0)) |
| return log_debug_errno(r, "Failed to read /run/host/container-manager: %m"); |
| |
| if (getpid_cached() == 1) { |
| /* If we are PID 1 we can just check our own environment variable, and that's authoritative. |
| * We distinguish three cases: |
| * - the variable is not defined → we jump to other checks |
| * - the variable is defined to an empty value → we are not in a container |
| * - anything else → some container, either one of the known ones or "container-other" |
| */ |
| e = getenv("container"); |
| if (!e) |
| goto check_files; |
| if (isempty(e)) { |
| r = VIRTUALIZATION_NONE; |
| goto finish; |
| } |
| |
| 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 (!IN_SET(r, -ENOENT, 0)) |
| 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"); |
| |
| check_files: |
| /* Check for existence of some well-known files. We only do this after checking |
| * for other specific container managers, otherwise we risk mistaking another |
| * container manager for Docker: the /.dockerenv file could inadvertently end up |
| * in a file system image. */ |
| r = detect_container_files(); |
| if (r) |
| goto finish; |
| |
| r = running_in_cgroupns(); |
| if (r > 0) { |
| r = VIRTUALIZATION_CONTAINER_OTHER; |
| goto finish; |
| } |
| if (r < 0) |
| log_debug_errno(r, "Failed to detect cgroup namespace: %m"); |
| |
| /* If none of that worked, give up, assume no container manager. */ |
| r = VIRTUALIZATION_NONE; |
| goto finish; |
| |
| translate_name: |
| if (streq(e, "oci")) { |
| /* Some images hardcode container=oci, but OCI is not a specific container manager. |
| * Try to detect one based on well-known files. */ |
| r = detect_container_files(); |
| if (!r) |
| r = VIRTUALIZATION_CONTAINER_OTHER; |
| goto finish; |
| } |
| r = container_from_string(e); |
| if (r < 0) |
| r = VIRTUALIZATION_CONTAINER_OTHER; |
| |
| finish: |
| log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
| cached_found = r; |
| return r; |
| } |
| |
| int detect_virtualization(void) { |
| int r; |
| |
| r = detect_container(); |
| if (r == 0) |
| r = detect_vm(); |
| |
| return r; |
| } |
| |
| static int userns_has_mapping(const char *name) { |
| _cleanup_fclose_ FILE *f = NULL; |
| _cleanup_free_ char *buf = NULL; |
| size_t n_allocated = 0; |
| ssize_t n; |
| uint32_t a, b, c; |
| int r; |
| |
| f = fopen(name, "re"); |
| if (!f) { |
| log_debug_errno(errno, "Failed to open %s: %m", name); |
| return errno == ENOENT ? false : -errno; |
| } |
| |
| n = getline(&buf, &n_allocated, f); |
| if (n < 0) { |
| if (feof(f)) { |
| log_debug("%s is empty, we're in an uninitialized user namespace", name); |
| return true; |
| } |
| |
| return log_debug_errno(errno, "Failed to read %s: %m", name); |
| } |
| |
| r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); |
| if (r < 3) |
| return log_debug_errno(errno, "Failed to parse %s: %m", name); |
| |
| if (a == 0 && b == 0 && c == UINT32_MAX) { |
| /* The kernel calls mappings_overlap() and does not allow overlaps */ |
| log_debug("%s has a full 1:1 mapping", name); |
| return false; |
| } |
| |
| /* Anything else implies that we are in a user namespace */ |
| log_debug("Mapping found in %s, we're in a user namespace", name); |
| return true; |
| } |
| |
| int running_in_userns(void) { |
| _cleanup_free_ char *line = NULL; |
| int r; |
| |
| r = userns_has_mapping("/proc/self/uid_map"); |
| if (r != 0) |
| return r; |
| |
| r = userns_has_mapping("/proc/self/gid_map"); |
| if (r != 0) |
| return r; |
| |
| /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also |
| * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" |
| * also does not exist. We cannot distinguish those two cases, so assume that |
| * we're running on a stripped-down recent kernel, rather than on an old one, |
| * and if the file is not found, return false. |
| */ |
| r = read_one_line_file("/proc/self/setgroups", &line); |
| if (r < 0) { |
| log_debug_errno(r, "/proc/self/setgroups: %m"); |
| return r == -ENOENT ? false : r; |
| } |
| |
| truncate_nl(line); |
| r = streq(line, "deny"); |
| /* See user_namespaces(7) for a description of this "setgroups" contents. */ |
| log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); |
| return r; |
| } |
| |
| int running_in_chroot(void) { |
| int r; |
| |
| if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
| return 0; |
| |
| r = files_same("/proc/1/root", "/", 0); |
| if (r < 0) |
| return r; |
| |
| return r == 0; |
| } |
| |
| #if defined(__i386__) || defined(__x86_64__) |
| struct cpuid_table_entry { |
| uint32_t flag_bit; |
| const char *name; |
| }; |
| |
| static const struct cpuid_table_entry leaf1_edx[] = { |
| { 0, "fpu" }, |
| { 1, "vme" }, |
| { 2, "de" }, |
| { 3, "pse" }, |
| { 4, "tsc" }, |
| { 5, "msr" }, |
| { 6, "pae" }, |
| { 7, "mce" }, |
| { 8, "cx8" }, |
| { 9, "apic" }, |
| { 11, "sep" }, |
| { 12, "mtrr" }, |
| { 13, "pge" }, |
| { 14, "mca" }, |
| { 15, "cmov" }, |
| { 16, "pat" }, |
| { 17, "pse36" }, |
| { 19, "clflush" }, |
| { 23, "mmx" }, |
| { 24, "fxsr" }, |
| { 25, "sse" }, |
| { 26, "sse2" }, |
| { 28, "ht" }, |
| }; |
| |
| static const struct cpuid_table_entry leaf1_ecx[] = { |
| { 0, "pni" }, |
| { 1, "pclmul" }, |
| { 3, "monitor" }, |
| { 9, "ssse3" }, |
| { 12, "fma3" }, |
| { 13, "cx16" }, |
| { 19, "sse4_1" }, |
| { 20, "sse4_2" }, |
| { 22, "movbe" }, |
| { 23, "popcnt" }, |
| { 25, "aes" }, |
| { 26, "xsave" }, |
| { 27, "osxsave" }, |
| { 28, "avx" }, |
| { 29, "f16c" }, |
| { 30, "rdrand" }, |
| }; |
| |
| static const struct cpuid_table_entry leaf7_ebx[] = { |
| { 3, "bmi1" }, |
| { 5, "avx2" }, |
| { 8, "bmi2" }, |
| { 18, "rdseed" }, |
| { 19, "adx" }, |
| { 29, "sha_ni" }, |
| }; |
| |
| static const struct cpuid_table_entry leaf81_edx[] = { |
| { 11, "syscall" }, |
| { 27, "rdtscp" }, |
| { 29, "lm" }, |
| }; |
| |
| static const struct cpuid_table_entry leaf81_ecx[] = { |
| { 0, "lahf_lm" }, |
| { 5, "abm" }, |
| }; |
| |
| static const struct cpuid_table_entry leaf87_edx[] = { |
| { 8, "constant_tsc" }, |
| }; |
| |
| static bool given_flag_in_set(const char *flag, const struct cpuid_table_entry *set, size_t set_size, uint32_t val) { |
| for (size_t i = 0; i < set_size; i++) { |
| if ((UINT32_C(1) << set[i].flag_bit) & val && |
| streq(flag, set[i].name)) |
| return true; |
| } |
| return false; |
| } |
| |
| static bool real_has_cpu_with_flag(const char *flag) { |
| uint32_t eax, ebx, ecx, edx; |
| |
| if (__get_cpuid(1, &eax, &ebx, &ecx, &edx)) { |
| if (given_flag_in_set(flag, leaf1_ecx, ELEMENTSOF(leaf1_ecx), ecx)) |
| return true; |
| |
| if (given_flag_in_set(flag, leaf1_edx, ELEMENTSOF(leaf1_edx), edx)) |
| return true; |
| } |
| |
| if (__get_cpuid(7, &eax, &ebx, &ecx, &edx)) { |
| if (given_flag_in_set(flag, leaf7_ebx, ELEMENTSOF(leaf7_ebx), ebx)) |
| return true; |
| } |
| |
| if (__get_cpuid(0x80000001U, &eax, &ebx, &ecx, &edx)) { |
| if (given_flag_in_set(flag, leaf81_ecx, ELEMENTSOF(leaf81_ecx), ecx)) |
| return true; |
| |
| if (given_flag_in_set(flag, leaf81_edx, ELEMENTSOF(leaf81_edx), edx)) |
| return true; |
| } |
| |
| if (__get_cpuid(0x80000007U, &eax, &ebx, &ecx, &edx)) |
| if (given_flag_in_set(flag, leaf87_edx, ELEMENTSOF(leaf87_edx), edx)) |
| return true; |
| |
| return false; |
| } |
| #endif |
| |
| bool has_cpu_with_flag(const char *flag) { |
| /* CPUID is an x86 specific interface. Assume on all others that no CPUs have those flags. */ |
| #if defined(__i386__) || defined(__x86_64__) |
| return real_has_cpu_with_flag(flag); |
| #else |
| return false; |
| #endif |
| } |
| |
| static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
| [VIRTUALIZATION_NONE] = "none", |
| [VIRTUALIZATION_KVM] = "kvm", |
| [VIRTUALIZATION_AMAZON] = "amazon", |
| [VIRTUALIZATION_QEMU] = "qemu", |
| [VIRTUALIZATION_BOCHS] = "bochs", |
| [VIRTUALIZATION_XEN] = "xen", |
| [VIRTUALIZATION_UML] = "uml", |
| [VIRTUALIZATION_VMWARE] = "vmware", |
| [VIRTUALIZATION_ORACLE] = "oracle", |
| [VIRTUALIZATION_MICROSOFT] = "microsoft", |
| [VIRTUALIZATION_ZVM] = "zvm", |
| [VIRTUALIZATION_PARALLELS] = "parallels", |
| [VIRTUALIZATION_BHYVE] = "bhyve", |
| [VIRTUALIZATION_QNX] = "qnx", |
| [VIRTUALIZATION_ACRN] = "acrn", |
| [VIRTUALIZATION_POWERVM] = "powervm", |
| [VIRTUALIZATION_VM_OTHER] = "vm-other", |
| |
| [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", |
| [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", |
| [VIRTUALIZATION_LXC] = "lxc", |
| [VIRTUALIZATION_OPENVZ] = "openvz", |
| [VIRTUALIZATION_DOCKER] = "docker", |
| [VIRTUALIZATION_PODMAN] = "podman", |
| [VIRTUALIZATION_RKT] = "rkt", |
| [VIRTUALIZATION_WSL] = "wsl", |
| [VIRTUALIZATION_PROOT] = "proot", |
| [VIRTUALIZATION_POUCH] = "pouch", |
| [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
| }; |
| |
| DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |
