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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b52aae1d | 2 | |
d31b0033 MG |
3 | #if defined(__i386__) || defined(__x86_64__) |
4 | #include <cpuid.h> | |
5 | #endif | |
b52aae1d | 6 | #include <errno.h> |
11c3a366 TA |
7 | #include <stdint.h> |
8 | #include <stdlib.h> | |
b52aae1d LP |
9 | #include <unistd.h> |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
ade61d3b | 12 | #include "dirent-util.h" |
295ee984 | 13 | #include "env-util.h" |
ade61d3b | 14 | #include "fd-util.h" |
07630cea | 15 | #include "fileio.h" |
11c3a366 | 16 | #include "macro.h" |
93cc7779 | 17 | #include "process-util.h" |
b5efdb8a | 18 | #include "stat-util.h" |
8b43440b | 19 | #include "string-table.h" |
07630cea | 20 | #include "string-util.h" |
b52aae1d LP |
21 | #include "virt.h" |
22 | ||
680120bb | 23 | #if defined(__i386__) || defined(__x86_64__) |
735ea55f YW |
24 | static const char *const vm_table[_VIRTUALIZATION_MAX] = { |
25 | [VIRTUALIZATION_XEN] = "XenVMMXenVMM", | |
26 | [VIRTUALIZATION_KVM] = "KVMKVMKVM", | |
27 | [VIRTUALIZATION_QEMU] = "TCGTCGTCGTCG", | |
28 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ | |
29 | [VIRTUALIZATION_VMWARE] = "VMwareVMware", | |
30 | /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ | |
31 | [VIRTUALIZATION_MICROSOFT] = "Microsoft Hv", | |
32 | /* https://wiki.freebsd.org/bhyve */ | |
33 | [VIRTUALIZATION_BHYVE] = "bhyve bhyve ", | |
34 | [VIRTUALIZATION_QNX] = "QNXQVMBSQG", | |
35 | /* https://projectacrn.org */ | |
36 | [VIRTUALIZATION_ACRN] = "ACRNACRNACRN", | |
37 | }; | |
38 | ||
39 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(vm, int); | |
680120bb | 40 | #endif |
735ea55f | 41 | |
75f86906 | 42 | static int detect_vm_cpuid(void) { |
b52aae1d | 43 | |
2ef8a4c4 | 44 | /* CPUID is an x86 specific interface. */ |
bdb628ee | 45 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 46 | |
d31b0033 | 47 | uint32_t eax, ebx, ecx, edx; |
b52aae1d LP |
48 | bool hypervisor; |
49 | ||
50 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d | 51 | |
b52aae1d | 52 | /* First detect whether there is a hypervisor */ |
d31b0033 MG |
53 | if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0) |
54 | return VIRTUALIZATION_NONE; | |
b52aae1d | 55 | |
5d904a6a | 56 | hypervisor = ecx & 0x80000000U; |
b52aae1d LP |
57 | |
58 | if (hypervisor) { | |
75f86906 LP |
59 | union { |
60 | uint32_t sig32[3]; | |
61 | char text[13]; | |
62 | } sig = {}; | |
735ea55f | 63 | int v; |
b52aae1d LP |
64 | |
65 | /* There is a hypervisor, see what it is */ | |
8481e3e7 | 66 | __cpuid(0x40000000U, eax, ebx, ecx, edx); |
d31b0033 MG |
67 | |
68 | sig.sig32[0] = ebx; | |
69 | sig.sig32[1] = ecx; | |
70 | sig.sig32[2] = edx; | |
b52aae1d | 71 | |
9f63a08d SS |
72 | log_debug("Virtualization found, CPUID=%s", sig.text); |
73 | ||
735ea55f YW |
74 | v = vm_from_string(sig.text); |
75 | if (v < 0) | |
76 | return VIRTUALIZATION_VM_OTHER; | |
bdb628ee | 77 | |
735ea55f | 78 | return v; |
b52aae1d | 79 | } |
bdb628ee | 80 | #endif |
9f63a08d | 81 | log_debug("No virtualization found in CPUID"); |
bdb628ee | 82 | |
75f86906 | 83 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
84 | } |
85 | ||
75f86906 | 86 | static int detect_vm_device_tree(void) { |
db6a8689 | 87 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
88 | _cleanup_free_ char *hvtype = NULL; |
89 | int r; | |
90 | ||
b8f1df82 | 91 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 92 | if (r == -ENOENT) { |
ce09c71d AJ |
93 | _cleanup_closedir_ DIR *dir = NULL; |
94 | struct dirent *dent; | |
95 | ||
96 | dir = opendir("/proc/device-tree"); | |
97 | if (!dir) { | |
9f63a08d SS |
98 | if (errno == ENOENT) { |
99 | log_debug_errno(errno, "/proc/device-tree: %m"); | |
75f86906 | 100 | return VIRTUALIZATION_NONE; |
9f63a08d | 101 | } |
ce09c71d AJ |
102 | return -errno; |
103 | } | |
104 | ||
75f86906 | 105 | FOREACH_DIRENT(dent, dir, return -errno) |
9f63a08d SS |
106 | if (strstr(dent->d_name, "fw-cfg")) { |
107 | log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); | |
75f86906 | 108 | return VIRTUALIZATION_QEMU; |
9f63a08d | 109 | } |
75f86906 | 110 | |
9f63a08d | 111 | log_debug("No virtualization found in /proc/device-tree/*"); |
75f86906 LP |
112 | return VIRTUALIZATION_NONE; |
113 | } else if (r < 0) | |
114 | return r; | |
115 | ||
9f63a08d | 116 | log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
75f86906 LP |
117 | if (streq(hvtype, "linux,kvm")) |
118 | return VIRTUALIZATION_KVM; | |
119 | else if (strstr(hvtype, "xen")) | |
120 | return VIRTUALIZATION_XEN; | |
4d4ac92c CL |
121 | else if (strstr(hvtype, "vmware")) |
122 | return VIRTUALIZATION_VMWARE; | |
75f86906 LP |
123 | else |
124 | return VIRTUALIZATION_VM_OTHER; | |
125 | #else | |
9f63a08d | 126 | log_debug("This platform does not support /proc/device-tree"); |
75f86906 | 127 | return VIRTUALIZATION_NONE; |
d831deb5 | 128 | #endif |
d831deb5 CA |
129 | } |
130 | ||
75f86906 | 131 | static int detect_vm_dmi(void) { |
2ef8a4c4 | 132 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
bdb628ee ZJS |
133 | |
134 | static const char *const dmi_vendors[] = { | |
3728dcde | 135 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
bdb628ee ZJS |
136 | "/sys/class/dmi/id/sys_vendor", |
137 | "/sys/class/dmi/id/board_vendor", | |
138 | "/sys/class/dmi/id/bios_vendor" | |
139 | }; | |
140 | ||
75f86906 LP |
141 | static const struct { |
142 | const char *vendor; | |
143 | int id; | |
144 | } dmi_vendor_table[] = { | |
87bc4b40 | 145 | { "KVM", VIRTUALIZATION_KVM }, |
25454a0c | 146 | { "QEMU", VIRTUALIZATION_QEMU }, |
a86cbb0f | 147 | { "VMware", VIRTUALIZATION_VMWARE }, /* https://kb.vmware.com/s/article/1009458 */ |
87bc4b40 JL |
148 | { "VMW", VIRTUALIZATION_VMWARE }, |
149 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
150 | { "Oracle Corporation", VIRTUALIZATION_ORACLE }, | |
151 | { "Xen", VIRTUALIZATION_XEN }, | |
152 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
153 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
aa0c3427 | 154 | /* https://wiki.freebsd.org/bhyve */ |
87bc4b40 | 155 | { "BHYVE", VIRTUALIZATION_BHYVE }, |
75f86906 | 156 | }; |
bdb628ee | 157 | unsigned i; |
75f86906 | 158 | int r; |
b52aae1d LP |
159 | |
160 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 161 | _cleanup_free_ char *s = NULL; |
75f86906 | 162 | unsigned j; |
b52aae1d | 163 | |
b1b8e816 LP |
164 | r = read_one_line_file(dmi_vendors[i], &s); |
165 | if (r < 0) { | |
75f86906 LP |
166 | if (r == -ENOENT) |
167 | continue; | |
b52aae1d | 168 | |
75f86906 | 169 | return r; |
b52aae1d LP |
170 | } |
171 | ||
75f86906 | 172 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
9f63a08d SS |
173 | if (startswith(s, dmi_vendor_table[j].vendor)) { |
174 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
75f86906 | 175 | return dmi_vendor_table[j].id; |
9f63a08d | 176 | } |
b52aae1d | 177 | } |
bdb628ee ZJS |
178 | #endif |
179 | ||
9f63a08d SS |
180 | log_debug("No virtualization found in DMI"); |
181 | ||
75f86906 | 182 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
183 | } |
184 | ||
75f86906 | 185 | static int detect_vm_xen(void) { |
45e1c7d5 | 186 | |
3f61278b | 187 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
87dc723a OH |
188 | The presence of /proc/xen indicates some form of a Xen domain */ |
189 | if (access("/proc/xen", F_OK) < 0) { | |
190 | log_debug("Virtualization XEN not found, /proc/xen does not exist"); | |
3f61278b SS |
191 | return VIRTUALIZATION_NONE; |
192 | } | |
193 | ||
87dc723a | 194 | log_debug("Virtualization XEN found (/proc/xen exists)"); |
45e1c7d5 | 195 | return VIRTUALIZATION_XEN; |
3f61278b SS |
196 | } |
197 | ||
575e6588 OH |
198 | #define XENFEAT_dom0 11 /* xen/include/public/features.h */ |
199 | #define PATH_FEATURES "/sys/hypervisor/properties/features" | |
1a8e4148 OH |
200 | /* Returns -errno, or 0 for domU, or 1 for dom0 */ |
201 | static int detect_vm_xen_dom0(void) { | |
75f86906 | 202 | _cleanup_free_ char *domcap = NULL; |
bdb628ee | 203 | int r; |
b52aae1d | 204 | |
575e6588 OH |
205 | r = read_one_line_file(PATH_FEATURES, &domcap); |
206 | if (r < 0 && r != -ENOENT) | |
207 | return r; | |
d6062e3b | 208 | if (r >= 0) { |
575e6588 OH |
209 | unsigned long features; |
210 | ||
47dbb99a YW |
211 | /* Here, we need to use sscanf() instead of safe_atoul() |
212 | * as the string lacks the leading "0x". */ | |
13e0f9fe OH |
213 | r = sscanf(domcap, "%lx", &features); |
214 | if (r == 1) { | |
575e6588 OH |
215 | r = !!(features & (1U << XENFEAT_dom0)); |
216 | log_debug("Virtualization XEN, found %s with value %08lx, " | |
217 | "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.", | |
218 | PATH_FEATURES, features, r ? "" : " not"); | |
219 | return r; | |
220 | } | |
221 | log_debug("Virtualization XEN, found %s, unhandled content '%s'", | |
222 | PATH_FEATURES, domcap); | |
223 | } | |
224 | ||
75f86906 | 225 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
9f63a08d | 226 | if (r == -ENOENT) { |
1a8e4148 OH |
227 | log_debug("Virtualization XEN because /proc/xen/capabilities does not exist"); |
228 | return 0; | |
9f63a08d | 229 | } |
d5b687e7 LP |
230 | if (r < 0) |
231 | return r; | |
bdb628ee | 232 | |
31a9be23 YW |
233 | for (const char *i = domcap;;) { |
234 | _cleanup_free_ char *cap = NULL; | |
9f63a08d | 235 | |
31a9be23 YW |
236 | r = extract_first_word(&i, &cap, ",", 0); |
237 | if (r < 0) | |
238 | return r; | |
239 | if (r == 0) { | |
240 | log_debug("Virtualization XEN DomU found (/proc/xen/capabilities)"); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | if (streq(cap, "control_d")) { | |
245 | log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); | |
246 | return 1; | |
247 | } | |
248 | } | |
75f86906 | 249 | } |
37287585 | 250 | |
75f86906 LP |
251 | static int detect_vm_hypervisor(void) { |
252 | _cleanup_free_ char *hvtype = NULL; | |
253 | int r; | |
37287585 | 254 | |
75f86906 LP |
255 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
256 | if (r == -ENOENT) | |
257 | return VIRTUALIZATION_NONE; | |
258 | if (r < 0) | |
259 | return r; | |
37287585 | 260 | |
9f63a08d SS |
261 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
262 | ||
75f86906 LP |
263 | if (streq(hvtype, "xen")) |
264 | return VIRTUALIZATION_XEN; | |
265 | else | |
266 | return VIRTUALIZATION_VM_OTHER; | |
267 | } | |
37287585 | 268 | |
75f86906 | 269 | static int detect_vm_uml(void) { |
6058516a | 270 | _cleanup_fclose_ FILE *f = NULL; |
75f86906 | 271 | int r; |
37287585 | 272 | |
75f86906 | 273 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
6058516a ZJS |
274 | f = fopen("/proc/cpuinfo", "re"); |
275 | if (!f) { | |
276 | if (errno == ENOENT) { | |
277 | log_debug("/proc/cpuinfo not found, assuming no UML virtualization."); | |
278 | return VIRTUALIZATION_NONE; | |
279 | } | |
280 | return -errno; | |
ef2a48aa | 281 | } |
9f63a08d | 282 | |
6058516a ZJS |
283 | for (;;) { |
284 | _cleanup_free_ char *line = NULL; | |
285 | const char *t; | |
286 | ||
287 | r = read_line(f, LONG_LINE_MAX, &line); | |
288 | if (r < 0) | |
289 | return r; | |
290 | if (r == 0) | |
291 | break; | |
292 | ||
293 | t = startswith(line, "vendor_id\t: "); | |
294 | if (t) { | |
295 | if (startswith(t, "User Mode Linux")) { | |
296 | log_debug("UML virtualization found in /proc/cpuinfo"); | |
297 | return VIRTUALIZATION_UML; | |
298 | } | |
299 | ||
300 | break; | |
301 | } | |
9f63a08d | 302 | } |
bdb628ee | 303 | |
ef2a48aa | 304 | log_debug("UML virtualization not found in /proc/cpuinfo."); |
75f86906 LP |
305 | return VIRTUALIZATION_NONE; |
306 | } | |
e32886e0 | 307 | |
75f86906 | 308 | static int detect_vm_zvm(void) { |
bdb628ee | 309 | |
75f86906 LP |
310 | #if defined(__s390__) |
311 | _cleanup_free_ char *t = NULL; | |
312 | int r; | |
e32886e0 | 313 | |
c4cd1d4d | 314 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
315 | if (r == -ENOENT) |
316 | return VIRTUALIZATION_NONE; | |
317 | if (r < 0) | |
318 | return r; | |
e32886e0 | 319 | |
9f63a08d | 320 | log_debug("Virtualization %s found in /proc/sysinfo", t); |
75f86906 LP |
321 | if (streq(t, "z/VM")) |
322 | return VIRTUALIZATION_ZVM; | |
323 | else | |
324 | return VIRTUALIZATION_KVM; | |
325 | #else | |
9f63a08d | 326 | log_debug("This platform does not support /proc/sysinfo"); |
75f86906 LP |
327 | return VIRTUALIZATION_NONE; |
328 | #endif | |
329 | } | |
e32886e0 | 330 | |
75f86906 LP |
331 | /* Returns a short identifier for the various VM implementations */ |
332 | int detect_vm(void) { | |
333 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
530c1c30 | 334 | bool other = false; |
c2b19b3c | 335 | int r, dmi; |
e32886e0 | 336 | |
75f86906 LP |
337 | if (cached_found >= 0) |
338 | return cached_found; | |
bdb628ee | 339 | |
f6875b0a | 340 | /* We have to use the correct order here: |
f6875b0a | 341 | * |
f2fe2865 LP |
342 | * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft |
343 | * Hyper-V. | |
344 | * | |
345 | * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is | |
346 | * overwritten. | |
347 | * | |
348 | * → Third, try to detect from DMI. */ | |
5f1c788c | 349 | |
28b1a3ea | 350 | dmi = detect_vm_dmi(); |
f2fe2865 | 351 | if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) { |
2f8e375d BR |
352 | r = dmi; |
353 | goto finish; | |
354 | } | |
5f1c788c | 355 | |
28b1a3ea | 356 | r = detect_vm_cpuid(); |
75f86906 LP |
357 | if (r < 0) |
358 | return r; | |
c2b19b3c LP |
359 | if (r == VIRTUALIZATION_VM_OTHER) |
360 | other = true; | |
361 | else if (r != VIRTUALIZATION_NONE) | |
362 | goto finish; | |
d831deb5 | 363 | |
c2b19b3c LP |
364 | /* Now, let's get back to DMI */ |
365 | if (dmi < 0) | |
366 | return dmi; | |
367 | if (dmi == VIRTUALIZATION_VM_OTHER) | |
368 | other = true; | |
369 | else if (dmi != VIRTUALIZATION_NONE) { | |
370 | r = dmi; | |
371 | goto finish; | |
530c1c30 | 372 | } |
b52aae1d | 373 | |
42685451 | 374 | /* x86 xen will most likely be detected by cpuid. If not (most likely |
87dc723a OH |
375 | * because we're not an x86 guest), then we should try the /proc/xen |
376 | * directory next. If that's not found, then we check for the high-level | |
377 | * hypervisor sysfs file. | |
2f5fa62b | 378 | */ |
42685451 AJ |
379 | |
380 | r = detect_vm_xen(); | |
7080ea16 RR |
381 | if (r < 0) |
382 | return r; | |
c2b19b3c LP |
383 | if (r == VIRTUALIZATION_VM_OTHER) |
384 | other = true; | |
385 | else if (r != VIRTUALIZATION_NONE) | |
386 | goto finish; | |
7080ea16 | 387 | |
75f86906 LP |
388 | r = detect_vm_hypervisor(); |
389 | if (r < 0) | |
390 | return r; | |
c2b19b3c LP |
391 | if (r == VIRTUALIZATION_VM_OTHER) |
392 | other = true; | |
393 | else if (r != VIRTUALIZATION_NONE) | |
394 | goto finish; | |
f41925b4 | 395 | |
75f86906 LP |
396 | r = detect_vm_device_tree(); |
397 | if (r < 0) | |
398 | return r; | |
c2b19b3c LP |
399 | if (r == VIRTUALIZATION_VM_OTHER) |
400 | other = true; | |
401 | else if (r != VIRTUALIZATION_NONE) | |
402 | goto finish; | |
f41925b4 | 403 | |
75f86906 LP |
404 | r = detect_vm_uml(); |
405 | if (r < 0) | |
406 | return r; | |
c2b19b3c LP |
407 | if (r == VIRTUALIZATION_VM_OTHER) |
408 | other = true; | |
409 | else if (r != VIRTUALIZATION_NONE) | |
410 | goto finish; | |
f41925b4 | 411 | |
75f86906 LP |
412 | r = detect_vm_zvm(); |
413 | if (r < 0) | |
414 | return r; | |
0fb533a5 LP |
415 | |
416 | finish: | |
3f61278b SS |
417 | /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
418 | * In order to detect the Dom0 as not virtualization we need to | |
419 | * double-check it */ | |
1a8e4148 | 420 | if (r == VIRTUALIZATION_XEN) { |
c2b19b3c LP |
421 | int dom0; |
422 | ||
423 | dom0 = detect_vm_xen_dom0(); | |
424 | if (dom0 < 0) | |
425 | return dom0; | |
426 | if (dom0 > 0) | |
1a8e4148 OH |
427 | r = VIRTUALIZATION_NONE; |
428 | } else if (r == VIRTUALIZATION_NONE && other) | |
530c1c30 | 429 | r = VIRTUALIZATION_VM_OTHER; |
3f61278b | 430 | |
0fb533a5 | 431 | cached_found = r; |
9f63a08d | 432 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
0fb533a5 | 433 | return r; |
b52aae1d LP |
434 | } |
435 | ||
735ea55f YW |
436 | static const char *const container_table[_VIRTUALIZATION_MAX] = { |
437 | [VIRTUALIZATION_LXC] = "lxc", | |
438 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
439 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
440 | [VIRTUALIZATION_DOCKER] = "docker", | |
441 | [VIRTUALIZATION_PODMAN] = "podman", | |
442 | [VIRTUALIZATION_RKT] = "rkt", | |
443 | [VIRTUALIZATION_WSL] = "wsl", | |
444 | }; | |
0fb533a5 | 445 | |
735ea55f YW |
446 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(container, int); |
447 | ||
448 | int detect_container(void) { | |
75f86906 | 449 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 450 | _cleanup_free_ char *m = NULL; |
6c8a2c67 | 451 | _cleanup_free_ char *o = NULL; |
75f86906 | 452 | const char *e = NULL; |
ab94af92 | 453 | int r; |
b52aae1d | 454 | |
75f86906 | 455 | if (cached_found >= 0) |
0fb533a5 | 456 | return cached_found; |
0fb533a5 | 457 | |
8d6e8034 | 458 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
b52aae1d LP |
459 | if (access("/proc/vz", F_OK) >= 0 && |
460 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 461 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 462 | goto finish; |
b52aae1d LP |
463 | } |
464 | ||
a2f838d5 ZJS |
465 | /* "Official" way of detecting WSL https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364, |
466 | * ... and a working one, since the official one doesn't actually work ;( | |
467 | */ | |
6c8a2c67 | 468 | r = read_one_line_file("/proc/sys/kernel/osrelease", &o); |
a2f838d5 ZJS |
469 | if (r >= 0 && |
470 | (strstr(o, "Microsoft") || strstr(o, "microsoft") || strstr(o, "WSL"))) { | |
471 | r = VIRTUALIZATION_WSL; | |
472 | goto finish; | |
6c8a2c67 BR |
473 | } |
474 | ||
df0ff127 | 475 | if (getpid_cached() == 1) { |
342bed02 ZJS |
476 | /* If we are PID 1 we can just check our own environment variable, and that's authoritative. |
477 | * We distinguish three cases: | |
478 | * - the variable is not defined → we jump to other checks | |
479 | * - the variable is defined to an empty value → we are not in a container | |
480 | * - anything else → some container, either one of the known ones or "container-other" | |
481 | */ | |
fdd25311 | 482 | e = getenv("container"); |
342bed02 ZJS |
483 | if (!e) |
484 | goto check_sched; | |
fdd25311 | 485 | if (isempty(e)) { |
75f86906 | 486 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
487 | goto finish; |
488 | } | |
fdd25311 | 489 | |
8d6e8034 LP |
490 | goto translate_name; |
491 | } | |
492 | ||
493 | /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing | |
494 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */ | |
495 | r = read_one_line_file("/run/systemd/container", &m); | |
a2176045 | 496 | if (r > 0) { |
8d6e8034 LP |
497 | e = m; |
498 | goto translate_name; | |
499 | } | |
a2176045 | 500 | if (!IN_SET(r, -ENOENT, 0)) |
8d6e8034 LP |
501 | return log_debug_errno(r, "Failed to read /run/systemd/container: %m"); |
502 | ||
503 | /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */ | |
504 | r = getenv_for_pid(1, "container", &m); | |
505 | if (r > 0) { | |
fdd25311 | 506 | e = m; |
8d6e8034 | 507 | goto translate_name; |
fdd25311 | 508 | } |
8d6e8034 LP |
509 | if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */ |
510 | log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m"); | |
511 | ||
342bed02 ZJS |
512 | /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. If the PID |
513 | * shown there is not 1, we know we are in a PID namespace and hence a container. */ | |
514 | check_sched: | |
8d6e8034 LP |
515 | r = read_one_line_file("/proc/1/sched", &m); |
516 | if (r >= 0) { | |
517 | const char *t; | |
518 | ||
519 | t = strrchr(m, '('); | |
520 | if (!t) | |
521 | return -EIO; | |
522 | ||
523 | if (!startswith(t, "(1,")) { | |
524 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
525 | goto finish; | |
526 | } | |
527 | } else if (r != -ENOENT) | |
528 | return r; | |
529 | ||
530 | /* If that didn't work, give up, assume no container manager. */ | |
531 | r = VIRTUALIZATION_NONE; | |
532 | goto finish; | |
b52aae1d | 533 | |
8d6e8034 | 534 | translate_name: |
735ea55f YW |
535 | r = container_from_string(e); |
536 | if (r < 0) | |
537 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
fdd25311 | 538 | |
0fb533a5 | 539 | finish: |
8d6e8034 | 540 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
0fb533a5 | 541 | cached_found = r; |
ab94af92 | 542 | return r; |
b52aae1d LP |
543 | } |
544 | ||
75f86906 | 545 | int detect_virtualization(void) { |
b52aae1d | 546 | int r; |
b52aae1d | 547 | |
75f86906 | 548 | r = detect_container(); |
9f63a08d SS |
549 | if (r == 0) |
550 | r = detect_vm(); | |
b52aae1d | 551 | |
9f63a08d | 552 | return r; |
b52aae1d | 553 | } |
75f86906 | 554 | |
299a34c1 ZJS |
555 | static int userns_has_mapping(const char *name) { |
556 | _cleanup_fclose_ FILE *f = NULL; | |
557 | _cleanup_free_ char *buf = NULL; | |
558 | size_t n_allocated = 0; | |
559 | ssize_t n; | |
560 | uint32_t a, b, c; | |
561 | int r; | |
562 | ||
563 | f = fopen(name, "re"); | |
564 | if (!f) { | |
565 | log_debug_errno(errno, "Failed to open %s: %m", name); | |
abd67ce7 | 566 | return errno == ENOENT ? false : -errno; |
299a34c1 ZJS |
567 | } |
568 | ||
569 | n = getline(&buf, &n_allocated, f); | |
570 | if (n < 0) { | |
571 | if (feof(f)) { | |
572 | log_debug("%s is empty, we're in an uninitialized user namespace", name); | |
573 | return true; | |
574 | } | |
575 | ||
576 | return log_debug_errno(errno, "Failed to read %s: %m", name); | |
577 | } | |
578 | ||
579 | r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); | |
580 | if (r < 3) | |
581 | return log_debug_errno(errno, "Failed to parse %s: %m", name); | |
582 | ||
583 | if (a == 0 && b == 0 && c == UINT32_MAX) { | |
584 | /* The kernel calls mappings_overlap() and does not allow overlaps */ | |
585 | log_debug("%s has a full 1:1 mapping", name); | |
586 | return false; | |
587 | } | |
588 | ||
589 | /* Anything else implies that we are in a user namespace */ | |
590 | log_debug("Mapping found in %s, we're in a user namespace", name); | |
591 | return true; | |
592 | } | |
593 | ||
594 | int running_in_userns(void) { | |
595 | _cleanup_free_ char *line = NULL; | |
596 | int r; | |
597 | ||
598 | r = userns_has_mapping("/proc/self/uid_map"); | |
599 | if (r != 0) | |
600 | return r; | |
601 | ||
602 | r = userns_has_mapping("/proc/self/gid_map"); | |
603 | if (r != 0) | |
604 | return r; | |
605 | ||
606 | /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also | |
607 | * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" | |
608 | * also does not exist. We cannot distinguish those two cases, so assume that | |
609 | * we're running on a stripped-down recent kernel, rather than on an old one, | |
610 | * and if the file is not found, return false. | |
611 | */ | |
612 | r = read_one_line_file("/proc/self/setgroups", &line); | |
613 | if (r < 0) { | |
614 | log_debug_errno(r, "/proc/self/setgroups: %m"); | |
615 | return r == -ENOENT ? false : r; | |
616 | } | |
617 | ||
618 | truncate_nl(line); | |
619 | r = streq(line, "deny"); | |
620 | /* See user_namespaces(7) for a description of this "setgroups" contents. */ | |
621 | log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); | |
622 | return r; | |
623 | } | |
624 | ||
7f4b3c5e | 625 | int running_in_chroot(void) { |
ef2a48aa | 626 | int r; |
7f4b3c5e | 627 | |
08a28eec LN |
628 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
629 | return 0; | |
630 | ||
ef2a48aa ZJS |
631 | r = files_same("/proc/1/root", "/", 0); |
632 | if (r < 0) | |
633 | return r; | |
7f4b3c5e | 634 | |
ef2a48aa | 635 | return r == 0; |
7f4b3c5e LP |
636 | } |
637 | ||
75f86906 LP |
638 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
639 | [VIRTUALIZATION_NONE] = "none", | |
640 | [VIRTUALIZATION_KVM] = "kvm", | |
641 | [VIRTUALIZATION_QEMU] = "qemu", | |
642 | [VIRTUALIZATION_BOCHS] = "bochs", | |
643 | [VIRTUALIZATION_XEN] = "xen", | |
644 | [VIRTUALIZATION_UML] = "uml", | |
645 | [VIRTUALIZATION_VMWARE] = "vmware", | |
646 | [VIRTUALIZATION_ORACLE] = "oracle", | |
647 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
648 | [VIRTUALIZATION_ZVM] = "zvm", | |
649 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
aa0c3427 | 650 | [VIRTUALIZATION_BHYVE] = "bhyve", |
1fdf07f5 | 651 | [VIRTUALIZATION_QNX] = "qnx", |
095b9cf4 | 652 | [VIRTUALIZATION_ACRN] = "acrn", |
75f86906 LP |
653 | [VIRTUALIZATION_VM_OTHER] = "vm-other", |
654 | ||
655 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
656 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
657 | [VIRTUALIZATION_LXC] = "lxc", | |
658 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
659 | [VIRTUALIZATION_DOCKER] = "docker", | |
90fb1f09 | 660 | [VIRTUALIZATION_PODMAN] = "podman", |
9fb16425 | 661 | [VIRTUALIZATION_RKT] = "rkt", |
6c8a2c67 | 662 | [VIRTUALIZATION_WSL] = "wsl", |
75f86906 LP |
663 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
664 | }; | |
665 | ||
666 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |