LCOV - code coverage report
Current view: top level - basic - virt.c (source / functions) Hit Total Coverage
Test: systemd_full.info Lines: 142 280 50.7 %
Date: 2019-08-23 13:36:53 Functions: 14 16 87.5 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 95 254 37.4 %

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: LGPL-2.1+ */
       2                 :            : 
       3                 :            : #if defined(__i386__) || defined(__x86_64__)
       4                 :            : #include <cpuid.h>
       5                 :            : #endif
       6                 :            : #include <errno.h>
       7                 :            : #include <stdint.h>
       8                 :            : #include <stdlib.h>
       9                 :            : #include <string.h>
      10                 :            : #include <unistd.h>
      11                 :            : 
      12                 :            : #include "alloc-util.h"
      13                 :            : #include "dirent-util.h"
      14                 :            : #include "env-util.h"
      15                 :            : #include "fd-util.h"
      16                 :            : #include "fileio.h"
      17                 :            : #include "macro.h"
      18                 :            : #include "process-util.h"
      19                 :            : #include "stat-util.h"
      20                 :            : #include "string-table.h"
      21                 :            : #include "string-util.h"
      22                 :            : #include "virt.h"
      23                 :            : 
      24                 :         16 : static int detect_vm_cpuid(void) {
      25                 :            : 
      26                 :            :         /* CPUID is an x86 specific interface. */
      27                 :            : #if defined(__i386__) || defined(__x86_64__)
      28                 :            : 
      29                 :            :         static const struct {
      30                 :            :                 const char *cpuid;
      31                 :            :                 int id;
      32                 :            :         } cpuid_vendor_table[] = {
      33                 :            :                 { "XenVMMXenVMM", VIRTUALIZATION_XEN       },
      34                 :            :                 { "KVMKVMKVM",    VIRTUALIZATION_KVM       },
      35                 :            :                 { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU      },
      36                 :            :                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
      37                 :            :                 { "VMwareVMware", VIRTUALIZATION_VMWARE    },
      38                 :            :                 /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
      39                 :            :                 { "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
      40                 :            :                 /* https://wiki.freebsd.org/bhyve */
      41                 :            :                 { "bhyve bhyve ", VIRTUALIZATION_BHYVE     },
      42                 :            :                 { "QNXQVMBSQG",   VIRTUALIZATION_QNX       },
      43                 :            :                 /* https://projectacrn.org */
      44                 :            :                 { "ACRNACRNACRN", VIRTUALIZATION_ACRN      },
      45                 :            :         };
      46                 :            : 
      47                 :            :         uint32_t eax, ebx, ecx, edx;
      48                 :            :         bool hypervisor;
      49                 :            : 
      50                 :            :         /* http://lwn.net/Articles/301888/ */
      51                 :            : 
      52                 :            :         /* First detect whether there is a hypervisor */
      53         [ -  + ]:         16 :         if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
      54                 :          0 :                 return VIRTUALIZATION_NONE;
      55                 :            : 
      56                 :         16 :         hypervisor = ecx & 0x80000000U;
      57                 :            : 
      58         [ -  + ]:         16 :         if (hypervisor) {
      59                 :            :                 union {
      60                 :            :                         uint32_t sig32[3];
      61                 :            :                         char text[13];
      62                 :          0 :                 } sig = {};
      63                 :            :                 unsigned j;
      64                 :            : 
      65                 :            :                 /* There is a hypervisor, see what it is */
      66                 :          0 :                 __cpuid(0x40000000U, eax, ebx, ecx, edx);
      67                 :            : 
      68                 :          0 :                 sig.sig32[0] = ebx;
      69                 :          0 :                 sig.sig32[1] = ecx;
      70                 :          0 :                 sig.sig32[2] = edx;
      71                 :            : 
      72         [ #  # ]:          0 :                 log_debug("Virtualization found, CPUID=%s", sig.text);
      73                 :            : 
      74         [ #  # ]:          0 :                 for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
      75         [ #  # ]:          0 :                         if (streq(sig.text, cpuid_vendor_table[j].cpuid))
      76                 :          0 :                                 return cpuid_vendor_table[j].id;
      77                 :            : 
      78                 :          0 :                 return VIRTUALIZATION_VM_OTHER;
      79                 :            :         }
      80                 :            : #endif
      81         [ +  + ]:         16 :         log_debug("No virtualization found in CPUID");
      82                 :            : 
      83                 :         16 :         return VIRTUALIZATION_NONE;
      84                 :            : }
      85                 :            : 
      86                 :         16 : static int detect_vm_device_tree(void) {
      87                 :            : #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
      88                 :            :         _cleanup_free_ char *hvtype = NULL;
      89                 :            :         int r;
      90                 :            : 
      91                 :            :         r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
      92                 :            :         if (r == -ENOENT) {
      93                 :            :                 _cleanup_closedir_ DIR *dir = NULL;
      94                 :            :                 struct dirent *dent;
      95                 :            : 
      96                 :            :                 dir = opendir("/proc/device-tree");
      97                 :            :                 if (!dir) {
      98                 :            :                         if (errno == ENOENT) {
      99                 :            :                                 log_debug_errno(errno, "/proc/device-tree: %m");
     100                 :            :                                 return VIRTUALIZATION_NONE;
     101                 :            :                         }
     102                 :            :                         return -errno;
     103                 :            :                 }
     104                 :            : 
     105                 :            :                 FOREACH_DIRENT(dent, dir, return -errno)
     106                 :            :                         if (strstr(dent->d_name, "fw-cfg")) {
     107                 :            :                                 log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name);
     108                 :            :                                 return VIRTUALIZATION_QEMU;
     109                 :            :                         }
     110                 :            : 
     111                 :            :                 log_debug("No virtualization found in /proc/device-tree/*");
     112                 :            :                 return VIRTUALIZATION_NONE;
     113                 :            :         } else if (r < 0)
     114                 :            :                 return r;
     115                 :            : 
     116                 :            :         log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype);
     117                 :            :         if (streq(hvtype, "linux,kvm"))
     118                 :            :                 return VIRTUALIZATION_KVM;
     119                 :            :         else if (strstr(hvtype, "xen"))
     120                 :            :                 return VIRTUALIZATION_XEN;
     121                 :            :         else
     122                 :            :                 return VIRTUALIZATION_VM_OTHER;
     123                 :            : #else
     124         [ +  + ]:         16 :         log_debug("This platform does not support /proc/device-tree");
     125                 :         16 :         return VIRTUALIZATION_NONE;
     126                 :            : #endif
     127                 :            : }
     128                 :            : 
     129                 :         16 : static int detect_vm_dmi(void) {
     130                 :            : #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
     131                 :            : 
     132                 :            :         static const char *const dmi_vendors[] = {
     133                 :            :                 "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
     134                 :            :                 "/sys/class/dmi/id/sys_vendor",
     135                 :            :                 "/sys/class/dmi/id/board_vendor",
     136                 :            :                 "/sys/class/dmi/id/bios_vendor"
     137                 :            :         };
     138                 :            : 
     139                 :            :         static const struct {
     140                 :            :                 const char *vendor;
     141                 :            :                 int id;
     142                 :            :         } dmi_vendor_table[] = {
     143                 :            :                 { "KVM",           VIRTUALIZATION_KVM       },
     144                 :            :                 { "QEMU",          VIRTUALIZATION_QEMU      },
     145                 :            :                 /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
     146                 :            :                 { "VMware",        VIRTUALIZATION_VMWARE    },
     147                 :            :                 { "VMW",           VIRTUALIZATION_VMWARE    },
     148                 :            :                 { "innotek GmbH",  VIRTUALIZATION_ORACLE    },
     149                 :            :                 { "Xen",           VIRTUALIZATION_XEN       },
     150                 :            :                 { "Bochs",         VIRTUALIZATION_BOCHS     },
     151                 :            :                 { "Parallels",     VIRTUALIZATION_PARALLELS },
     152                 :            :                 /* https://wiki.freebsd.org/bhyve */
     153                 :            :                 { "BHYVE",         VIRTUALIZATION_BHYVE     },
     154                 :            :         };
     155                 :            :         unsigned i;
     156                 :            :         int r;
     157                 :            : 
     158         [ +  + ]:         80 :         for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
     159      [ +  -  - ]:         64 :                 _cleanup_free_ char *s = NULL;
     160                 :            :                 unsigned j;
     161                 :            : 
     162                 :         64 :                 r = read_one_line_file(dmi_vendors[i], &s);
     163         [ -  + ]:         64 :                 if (r < 0) {
     164         [ #  # ]:          0 :                         if (r == -ENOENT)
     165                 :          0 :                                 continue;
     166                 :            : 
     167                 :          0 :                         return r;
     168                 :            :                 }
     169                 :            : 
     170         [ +  + ]:        640 :                 for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
     171         [ -  + ]:        576 :                         if (startswith(s, dmi_vendor_table[j].vendor)) {
     172         [ #  # ]:          0 :                                 log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]);
     173                 :          0 :                                 return dmi_vendor_table[j].id;
     174                 :            :                         }
     175                 :            :         }
     176                 :            : #endif
     177                 :            : 
     178         [ +  + ]:         16 :         log_debug("No virtualization found in DMI");
     179                 :            : 
     180                 :         16 :         return VIRTUALIZATION_NONE;
     181                 :            : }
     182                 :            : 
     183                 :         16 : static int detect_vm_xen(void) {
     184                 :            : 
     185                 :            :         /* Check for Dom0 will be executed later in detect_vm_xen_dom0
     186                 :            :            The presence of /proc/xen indicates some form of a Xen domain */
     187         [ +  - ]:         16 :         if (access("/proc/xen", F_OK) < 0) {
     188         [ +  + ]:         16 :                 log_debug("Virtualization XEN not found, /proc/xen does not exist");
     189                 :         16 :                 return VIRTUALIZATION_NONE;
     190                 :            :         }
     191                 :            : 
     192         [ #  # ]:          0 :         log_debug("Virtualization XEN found (/proc/xen exists)");
     193                 :          0 :         return VIRTUALIZATION_XEN;
     194                 :            : }
     195                 :            : 
     196                 :            : #define XENFEAT_dom0 11 /* xen/include/public/features.h */
     197                 :            : #define PATH_FEATURES "/sys/hypervisor/properties/features"
     198                 :            : /* Returns -errno, or 0 for domU, or 1 for dom0 */
     199                 :          0 : static int detect_vm_xen_dom0(void) {
     200                 :          0 :         _cleanup_free_ char *domcap = NULL;
     201                 :            :         int r;
     202                 :            : 
     203                 :          0 :         r = read_one_line_file(PATH_FEATURES, &domcap);
     204   [ #  #  #  # ]:          0 :         if (r < 0 && r != -ENOENT)
     205                 :          0 :                 return r;
     206         [ #  # ]:          0 :         if (r >= 0) {
     207                 :            :                 unsigned long features;
     208                 :            : 
     209                 :            :                 /* Here, we need to use sscanf() instead of safe_atoul()
     210                 :            :                  * as the string lacks the leading "0x". */
     211                 :          0 :                 r = sscanf(domcap, "%lx", &features);
     212         [ #  # ]:          0 :                 if (r == 1) {
     213                 :          0 :                         r = !!(features & (1U << XENFEAT_dom0));
     214   [ #  #  #  # ]:          0 :                         log_debug("Virtualization XEN, found %s with value %08lx, "
     215                 :            :                                   "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.",
     216                 :            :                                   PATH_FEATURES, features, r ? "" : " not");
     217                 :          0 :                         return r;
     218                 :            :                 }
     219         [ #  # ]:          0 :                 log_debug("Virtualization XEN, found %s, unhandled content '%s'",
     220                 :            :                           PATH_FEATURES, domcap);
     221                 :            :         }
     222                 :            : 
     223                 :          0 :         r = read_one_line_file("/proc/xen/capabilities", &domcap);
     224         [ #  # ]:          0 :         if (r == -ENOENT) {
     225         [ #  # ]:          0 :                 log_debug("Virtualization XEN because /proc/xen/capabilities does not exist");
     226                 :          0 :                 return 0;
     227                 :            :         }
     228         [ #  # ]:          0 :         if (r < 0)
     229                 :          0 :                 return r;
     230                 :            : 
     231                 :          0 :         for (const char *i = domcap;;) {
     232         [ #  # ]:          0 :                 _cleanup_free_ char *cap = NULL;
     233                 :            : 
     234                 :          0 :                 r = extract_first_word(&i, &cap, ",", 0);
     235         [ #  # ]:          0 :                 if (r < 0)
     236                 :          0 :                         return r;
     237         [ #  # ]:          0 :                 if (r == 0) {
     238         [ #  # ]:          0 :                         log_debug("Virtualization XEN DomU found (/proc/xen/capabilities)");
     239                 :          0 :                         return 0;
     240                 :            :                 }
     241                 :            : 
     242         [ #  # ]:          0 :                 if (streq(cap, "control_d")) {
     243         [ #  # ]:          0 :                         log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)");
     244                 :          0 :                         return 1;
     245                 :            :                 }
     246                 :            :         }
     247                 :            : }
     248                 :            : 
     249                 :         16 : static int detect_vm_hypervisor(void) {
     250                 :         16 :         _cleanup_free_ char *hvtype = NULL;
     251                 :            :         int r;
     252                 :            : 
     253                 :         16 :         r = read_one_line_file("/sys/hypervisor/type", &hvtype);
     254         [ +  - ]:         16 :         if (r == -ENOENT)
     255                 :         16 :                 return VIRTUALIZATION_NONE;
     256         [ #  # ]:          0 :         if (r < 0)
     257                 :          0 :                 return r;
     258                 :            : 
     259         [ #  # ]:          0 :         log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype);
     260                 :            : 
     261         [ #  # ]:          0 :         if (streq(hvtype, "xen"))
     262                 :          0 :                 return VIRTUALIZATION_XEN;
     263                 :            :         else
     264                 :          0 :                 return VIRTUALIZATION_VM_OTHER;
     265                 :            : }
     266                 :            : 
     267                 :         16 : static int detect_vm_uml(void) {
     268                 :         16 :         _cleanup_fclose_ FILE *f = NULL;
     269                 :            :         int r;
     270                 :            : 
     271                 :            :         /* Detect User-Mode Linux by reading /proc/cpuinfo */
     272                 :         16 :         f = fopen("/proc/cpuinfo", "re");
     273         [ -  + ]:         16 :         if (!f) {
     274         [ #  # ]:          0 :                 if (errno == ENOENT) {
     275         [ #  # ]:          0 :                         log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
     276                 :          0 :                         return VIRTUALIZATION_NONE;
     277                 :            :                 }
     278                 :          0 :                 return -errno;
     279                 :            :         }
     280                 :            : 
     281                 :         16 :         for (;;) {
     282      [ +  -  + ]:         32 :                 _cleanup_free_ char *line = NULL;
     283                 :            :                 const char *t;
     284                 :            : 
     285                 :         32 :                 r = read_line(f, LONG_LINE_MAX, &line);
     286         [ -  + ]:         32 :                 if (r < 0)
     287                 :          0 :                         return r;
     288         [ -  + ]:         32 :                 if (r == 0)
     289                 :          0 :                         break;
     290                 :            : 
     291                 :         32 :                 t = startswith(line, "vendor_id\t: ");
     292         [ +  + ]:         32 :                 if (t) {
     293         [ -  + ]:         16 :                         if (startswith(t, "User Mode Linux")) {
     294         [ #  # ]:          0 :                                 log_debug("UML virtualization found in /proc/cpuinfo");
     295                 :          0 :                                 return VIRTUALIZATION_UML;
     296                 :            :                         }
     297                 :            : 
     298                 :         16 :                         break;
     299                 :            :                 }
     300                 :            :         }
     301                 :            : 
     302         [ +  + ]:         16 :         log_debug("UML virtualization not found in /proc/cpuinfo.");
     303                 :         16 :         return VIRTUALIZATION_NONE;
     304                 :            : }
     305                 :            : 
     306                 :         16 : static int detect_vm_zvm(void) {
     307                 :            : 
     308                 :            : #if defined(__s390__)
     309                 :            :         _cleanup_free_ char *t = NULL;
     310                 :            :         int r;
     311                 :            : 
     312                 :            :         r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
     313                 :            :         if (r == -ENOENT)
     314                 :            :                 return VIRTUALIZATION_NONE;
     315                 :            :         if (r < 0)
     316                 :            :                 return r;
     317                 :            : 
     318                 :            :         log_debug("Virtualization %s found in /proc/sysinfo", t);
     319                 :            :         if (streq(t, "z/VM"))
     320                 :            :                 return VIRTUALIZATION_ZVM;
     321                 :            :         else
     322                 :            :                 return VIRTUALIZATION_KVM;
     323                 :            : #else
     324         [ +  + ]:         16 :         log_debug("This platform does not support /proc/sysinfo");
     325                 :         16 :         return VIRTUALIZATION_NONE;
     326                 :            : #endif
     327                 :            : }
     328                 :            : 
     329                 :            : /* Returns a short identifier for the various VM implementations */
     330                 :         76 : int detect_vm(void) {
     331                 :            :         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
     332                 :         76 :         bool other = false;
     333                 :            :         int r, dmi;
     334                 :            : 
     335         [ +  + ]:         76 :         if (cached_found >= 0)
     336                 :         60 :                 return cached_found;
     337                 :            : 
     338                 :            :         /* We have to use the correct order here:
     339                 :            :          *
     340                 :            :          * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft
     341                 :            :          *   Hyper-V.
     342                 :            :          *
     343                 :            :          * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is
     344                 :            :          *   overwritten.
     345                 :            :          *
     346                 :            :          * → Third, try to detect from DMI. */
     347                 :            : 
     348                 :         16 :         dmi = detect_vm_dmi();
     349   [ -  +  -  + ]:         16 :         if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) {
     350                 :          0 :                 r = dmi;
     351                 :          0 :                 goto finish;
     352                 :            :         }
     353                 :            : 
     354                 :         16 :         r = detect_vm_cpuid();
     355         [ -  + ]:         16 :         if (r < 0)
     356                 :          0 :                 return r;
     357         [ -  + ]:         16 :         if (r == VIRTUALIZATION_VM_OTHER)
     358                 :          0 :                 other = true;
     359         [ -  + ]:         16 :         else if (r != VIRTUALIZATION_NONE)
     360                 :          0 :                 goto finish;
     361                 :            : 
     362                 :            :         /* Now, let's get back to DMI */
     363         [ -  + ]:         16 :         if (dmi < 0)
     364                 :          0 :                 return dmi;
     365         [ -  + ]:         16 :         if (dmi == VIRTUALIZATION_VM_OTHER)
     366                 :          0 :                 other = true;
     367         [ -  + ]:         16 :         else if (dmi != VIRTUALIZATION_NONE) {
     368                 :          0 :                 r = dmi;
     369                 :          0 :                 goto finish;
     370                 :            :         }
     371                 :            : 
     372                 :            :         /* x86 xen will most likely be detected by cpuid. If not (most likely
     373                 :            :          * because we're not an x86 guest), then we should try the /proc/xen
     374                 :            :          * directory next. If that's not found, then we check for the high-level
     375                 :            :          * hypervisor sysfs file.
     376                 :            :          */
     377                 :            : 
     378                 :         16 :         r = detect_vm_xen();
     379         [ -  + ]:         16 :         if (r < 0)
     380                 :          0 :                 return r;
     381         [ -  + ]:         16 :         if (r == VIRTUALIZATION_VM_OTHER)
     382                 :          0 :                 other = true;
     383         [ -  + ]:         16 :         else if (r != VIRTUALIZATION_NONE)
     384                 :          0 :                 goto finish;
     385                 :            : 
     386                 :         16 :         r = detect_vm_hypervisor();
     387         [ -  + ]:         16 :         if (r < 0)
     388                 :          0 :                 return r;
     389         [ -  + ]:         16 :         if (r == VIRTUALIZATION_VM_OTHER)
     390                 :          0 :                 other = true;
     391         [ -  + ]:         16 :         else if (r != VIRTUALIZATION_NONE)
     392                 :          0 :                 goto finish;
     393                 :            : 
     394                 :         16 :         r = detect_vm_device_tree();
     395         [ -  + ]:         16 :         if (r < 0)
     396                 :          0 :                 return r;
     397         [ -  + ]:         16 :         if (r == VIRTUALIZATION_VM_OTHER)
     398                 :          0 :                 other = true;
     399         [ -  + ]:         16 :         else if (r != VIRTUALIZATION_NONE)
     400                 :          0 :                 goto finish;
     401                 :            : 
     402                 :         16 :         r = detect_vm_uml();
     403         [ -  + ]:         16 :         if (r < 0)
     404                 :          0 :                 return r;
     405         [ -  + ]:         16 :         if (r == VIRTUALIZATION_VM_OTHER)
     406                 :          0 :                 other = true;
     407         [ -  + ]:         16 :         else if (r != VIRTUALIZATION_NONE)
     408                 :          0 :                 goto finish;
     409                 :            : 
     410                 :         16 :         r = detect_vm_zvm();
     411         [ -  + ]:         16 :         if (r < 0)
     412                 :          0 :                 return r;
     413                 :            : 
     414                 :         16 : finish:
     415                 :            :         /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others.
     416                 :            :          * In order to detect the Dom0 as not virtualization we need to
     417                 :            :          * double-check it */
     418         [ -  + ]:         16 :         if (r == VIRTUALIZATION_XEN) {
     419                 :            :                 int dom0;
     420                 :            : 
     421                 :          0 :                 dom0 = detect_vm_xen_dom0();
     422         [ #  # ]:          0 :                 if (dom0 < 0)
     423                 :          0 :                         return dom0;
     424         [ #  # ]:          0 :                 if (dom0 > 0)
     425                 :          0 :                         r = VIRTUALIZATION_NONE;
     426   [ +  -  -  + ]:         16 :         } else if (r == VIRTUALIZATION_NONE && other)
     427                 :          0 :                 r = VIRTUALIZATION_VM_OTHER;
     428                 :            : 
     429                 :         16 :         cached_found = r;
     430         [ +  + ]:         16 :         log_debug("Found VM virtualization %s", virtualization_to_string(r));
     431                 :         16 :         return r;
     432                 :            : }
     433                 :            : 
     434                 :       1954 : int detect_container(void) {
     435                 :            :         static const struct {
     436                 :            :                 const char *value;
     437                 :            :                 int id;
     438                 :            :         } value_table[] = {
     439                 :            :                 { "lxc",            VIRTUALIZATION_LXC            },
     440                 :            :                 { "lxc-libvirt",    VIRTUALIZATION_LXC_LIBVIRT    },
     441                 :            :                 { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
     442                 :            :                 { "docker",         VIRTUALIZATION_DOCKER         },
     443                 :            :                 { "podman",         VIRTUALIZATION_PODMAN         },
     444                 :            :                 { "rkt",            VIRTUALIZATION_RKT            },
     445                 :            :                 { "wsl",            VIRTUALIZATION_WSL            },
     446                 :            :         };
     447                 :            : 
     448                 :            :         static thread_local int cached_found = _VIRTUALIZATION_INVALID;
     449                 :       1954 :         _cleanup_free_ char *m = NULL;
     450                 :       1954 :         _cleanup_free_ char *o = NULL;
     451                 :       1954 :         const char *e = NULL;
     452                 :            :         unsigned j;
     453                 :            :         int r;
     454                 :            : 
     455         [ +  + ]:       1954 :         if (cached_found >= 0)
     456                 :        384 :                 return cached_found;
     457                 :            : 
     458                 :            :         /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */
     459   [ -  +  #  # ]:       1570 :         if (access("/proc/vz", F_OK) >= 0 &&
     460                 :          0 :             access("/proc/bc", F_OK) < 0) {
     461                 :          0 :                 r = VIRTUALIZATION_OPENVZ;
     462                 :          0 :                 goto finish;
     463                 :            :         }
     464                 :            : 
     465                 :            :         /* "Official" way of detecting WSL https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364 */
     466                 :       1570 :         r = read_one_line_file("/proc/sys/kernel/osrelease", &o);
     467         [ +  - ]:       1570 :         if (r >= 0) {
     468   [ +  -  -  + ]:       1570 :                 if (strstr(o, "Microsoft") || strstr(o, "WSL")) {
     469                 :          0 :                         r = VIRTUALIZATION_WSL;
     470                 :          0 :                         goto finish;
     471                 :            :                 }
     472                 :            :         }
     473                 :            : 
     474         [ -  + ]:       1570 :         if (getpid_cached() == 1) {
     475                 :            :                 /* If we are PID 1 we can just check our own environment variable, and that's authoritative.
     476                 :            :                  * We distinguish three cases:
     477                 :            :                  * - the variable is not defined → we jump to other checks
     478                 :            :                  * - the variable is defined to an empty value → we are not in a container
     479                 :            :                  * - anything else → some container, either one of the known ones or "container-other"
     480                 :            :                  */
     481                 :          0 :                 e = getenv("container");
     482         [ #  # ]:          0 :                 if (!e)
     483                 :          0 :                         goto check_sched;
     484         [ #  # ]:          0 :                 if (isempty(e)) {
     485                 :          0 :                         r = VIRTUALIZATION_NONE;
     486                 :          0 :                         goto finish;
     487                 :            :                 }
     488                 :            : 
     489                 :          0 :                 goto translate_name;
     490                 :            :         }
     491                 :            : 
     492                 :            :         /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing
     493                 :            :          * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */
     494                 :       1570 :         r = read_one_line_file("/run/systemd/container", &m);
     495         [ -  + ]:       1570 :         if (r > 0) {
     496                 :          0 :                 e = m;
     497                 :          0 :                 goto translate_name;
     498                 :            :         }
     499   [ +  -  -  + ]:       1570 :         if (!IN_SET(r, -ENOENT, 0))
     500         [ #  # ]:          0 :                 return log_debug_errno(r, "Failed to read /run/systemd/container: %m");
     501                 :            : 
     502                 :            :         /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */
     503                 :       1570 :         r = getenv_for_pid(1, "container", &m);
     504         [ -  + ]:       1570 :         if (r > 0) {
     505                 :          0 :                 e = m;
     506                 :          0 :                 goto translate_name;
     507                 :            :         }
     508         [ -  + ]:       1570 :         if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */
     509         [ +  + ]:       1570 :                 log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m");
     510                 :            : 
     511                 :            :         /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. If the PID
     512                 :            :          * shown there is not 1, we know we are in a PID namespace and hence a container. */
     513                 :          0 :  check_sched:
     514                 :       1570 :         r = read_one_line_file("/proc/1/sched", &m);
     515         [ +  - ]:       1570 :         if (r >= 0) {
     516                 :            :                 const char *t;
     517                 :            : 
     518                 :       1570 :                 t = strrchr(m, '(');
     519         [ -  + ]:       1570 :                 if (!t)
     520                 :          0 :                         return -EIO;
     521                 :            : 
     522         [ -  + ]:       1570 :                 if (!startswith(t, "(1,")) {
     523                 :          0 :                         r = VIRTUALIZATION_CONTAINER_OTHER;
     524                 :          0 :                         goto finish;
     525                 :            :                 }
     526         [ #  # ]:          0 :         } else if (r != -ENOENT)
     527                 :          0 :                 return r;
     528                 :            : 
     529                 :            :         /* If that didn't work, give up, assume no container manager. */
     530                 :       1570 :         r = VIRTUALIZATION_NONE;
     531                 :       1570 :         goto finish;
     532                 :            : 
     533                 :          0 : translate_name:
     534         [ #  # ]:          0 :         for (j = 0; j < ELEMENTSOF(value_table); j++)
     535         [ #  # ]:          0 :                 if (streq(e, value_table[j].value)) {
     536                 :          0 :                         r = value_table[j].id;
     537                 :          0 :                         goto finish;
     538                 :            :                 }
     539                 :            : 
     540                 :          0 :         r = VIRTUALIZATION_CONTAINER_OTHER;
     541                 :            : 
     542                 :       1570 : finish:
     543         [ +  + ]:       1570 :         log_debug("Found container virtualization %s.", virtualization_to_string(r));
     544                 :       1570 :         cached_found = r;
     545                 :       1570 :         return r;
     546                 :            : }
     547                 :            : 
     548                 :         72 : int detect_virtualization(void) {
     549                 :            :         int r;
     550                 :            : 
     551                 :         72 :         r = detect_container();
     552         [ +  - ]:         72 :         if (r == 0)
     553                 :         72 :                 r = detect_vm();
     554                 :            : 
     555                 :         72 :         return r;
     556                 :            : }
     557                 :            : 
     558                 :         16 : static int userns_has_mapping(const char *name) {
     559                 :         16 :         _cleanup_fclose_ FILE *f = NULL;
     560                 :         16 :         _cleanup_free_ char *buf = NULL;
     561                 :         16 :         size_t n_allocated = 0;
     562                 :            :         ssize_t n;
     563                 :            :         uint32_t a, b, c;
     564                 :            :         int r;
     565                 :            : 
     566                 :         16 :         f = fopen(name, "re");
     567         [ -  + ]:         16 :         if (!f) {
     568         [ #  # ]:          0 :                 log_debug_errno(errno, "Failed to open %s: %m", name);
     569         [ #  # ]:          0 :                 return errno == ENOENT ? false : -errno;
     570                 :            :         }
     571                 :            : 
     572                 :         16 :         n = getline(&buf, &n_allocated, f);
     573         [ -  + ]:         16 :         if (n < 0) {
     574         [ #  # ]:          0 :                 if (feof(f)) {
     575         [ #  # ]:          0 :                         log_debug("%s is empty, we're in an uninitialized user namespace", name);
     576                 :          0 :                         return true;
     577                 :            :                 }
     578                 :            : 
     579         [ #  # ]:          0 :                 return log_debug_errno(errno, "Failed to read %s: %m", name);
     580                 :            :         }
     581                 :            : 
     582                 :         16 :         r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c);
     583         [ -  + ]:         16 :         if (r < 3)
     584         [ #  # ]:          0 :                 return log_debug_errno(errno, "Failed to parse %s: %m", name);
     585                 :            : 
     586   [ +  -  +  -  :         16 :         if (a == 0 && b == 0 && c == UINT32_MAX) {
                   +  - ]
     587                 :            :                 /* The kernel calls mappings_overlap() and does not allow overlaps */
     588         [ +  - ]:         16 :                 log_debug("%s has a full 1:1 mapping", name);
     589                 :         16 :                 return false;
     590                 :            :         }
     591                 :            : 
     592                 :            :         /* Anything else implies that we are in a user namespace */
     593         [ #  # ]:          0 :         log_debug("Mapping found in %s, we're in a user namespace", name);
     594                 :          0 :         return true;
     595                 :            : }
     596                 :            : 
     597                 :          8 : int running_in_userns(void) {
     598                 :          8 :         _cleanup_free_ char *line = NULL;
     599                 :            :         int r;
     600                 :            : 
     601                 :          8 :         r = userns_has_mapping("/proc/self/uid_map");
     602         [ -  + ]:          8 :         if (r != 0)
     603                 :          0 :                 return r;
     604                 :            : 
     605                 :          8 :         r = userns_has_mapping("/proc/self/gid_map");
     606         [ -  + ]:          8 :         if (r != 0)
     607                 :          0 :                 return r;
     608                 :            : 
     609                 :            :         /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also
     610                 :            :          * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups"
     611                 :            :          * also does not exist. We cannot distinguish those two cases, so assume that
     612                 :            :          * we're running on a stripped-down recent kernel, rather than on an old one,
     613                 :            :          * and if the file is not found, return false.
     614                 :            :          */
     615                 :          8 :         r = read_one_line_file("/proc/self/setgroups", &line);
     616         [ -  + ]:          8 :         if (r < 0) {
     617         [ #  # ]:          0 :                 log_debug_errno(r, "/proc/self/setgroups: %m");
     618         [ #  # ]:          0 :                 return r == -ENOENT ? false : r;
     619                 :            :         }
     620                 :            : 
     621                 :          8 :         truncate_nl(line);
     622                 :          8 :         r = streq(line, "deny");
     623                 :            :         /* See user_namespaces(7) for a description of this "setgroups" contents. */
     624   [ +  -  -  + ]:          8 :         log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in");
     625                 :          8 :         return r;
     626                 :            : }
     627                 :            : 
     628                 :          0 : int running_in_chroot(void) {
     629                 :            :         int r;
     630                 :            : 
     631         [ #  # ]:          0 :         if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
     632                 :          0 :                 return 0;
     633                 :            : 
     634                 :          0 :         r = files_same("/proc/1/root", "/", 0);
     635         [ #  # ]:          0 :         if (r < 0)
     636                 :          0 :                 return r;
     637                 :            : 
     638                 :          0 :         return r == 0;
     639                 :            : }
     640                 :            : 
     641                 :            : static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
     642                 :            :         [VIRTUALIZATION_NONE] = "none",
     643                 :            :         [VIRTUALIZATION_KVM] = "kvm",
     644                 :            :         [VIRTUALIZATION_QEMU] = "qemu",
     645                 :            :         [VIRTUALIZATION_BOCHS] = "bochs",
     646                 :            :         [VIRTUALIZATION_XEN] = "xen",
     647                 :            :         [VIRTUALIZATION_UML] = "uml",
     648                 :            :         [VIRTUALIZATION_VMWARE] = "vmware",
     649                 :            :         [VIRTUALIZATION_ORACLE] = "oracle",
     650                 :            :         [VIRTUALIZATION_MICROSOFT] = "microsoft",
     651                 :            :         [VIRTUALIZATION_ZVM] = "zvm",
     652                 :            :         [VIRTUALIZATION_PARALLELS] = "parallels",
     653                 :            :         [VIRTUALIZATION_BHYVE] = "bhyve",
     654                 :            :         [VIRTUALIZATION_QNX] = "qnx",
     655                 :            :         [VIRTUALIZATION_ACRN] = "acrn",
     656                 :            :         [VIRTUALIZATION_VM_OTHER] = "vm-other",
     657                 :            : 
     658                 :            :         [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
     659                 :            :         [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
     660                 :            :         [VIRTUALIZATION_LXC] = "lxc",
     661                 :            :         [VIRTUALIZATION_OPENVZ] = "openvz",
     662                 :            :         [VIRTUALIZATION_DOCKER] = "docker",
     663                 :            :         [VIRTUALIZATION_PODMAN] = "podman",
     664                 :            :         [VIRTUALIZATION_RKT] = "rkt",
     665                 :            :         [VIRTUALIZATION_WSL] = "wsl",
     666                 :            :         [VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
     667                 :            : };
     668                 :            : 
     669   [ +  +  +  + ]:        512 : DEFINE_STRING_TABLE_LOOKUP(virtualization, int);

Generated by: LCOV version 1.14