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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 <unistd.h> | |
10 | ||
11 | #include "alloc-util.h" | |
12 | #include "dirent-util.h" | |
13 | #include "env-util.h" | |
14 | #include "fd-util.h" | |
15 | #include "fileio.h" | |
16 | #include "macro.h" | |
17 | #include "process-util.h" | |
18 | #include "stat-util.h" | |
19 | #include "string-table.h" | |
20 | #include "string-util.h" | |
21 | #include "virt.h" | |
22 | ||
23 | #if defined(__i386__) || defined(__x86_64__) | |
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); | |
40 | #endif | |
41 | ||
42 | static int detect_vm_cpuid(void) { | |
43 | ||
44 | /* CPUID is an x86 specific interface. */ | |
45 | #if defined(__i386__) || defined(__x86_64__) | |
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 | if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0) | |
54 | return VIRTUALIZATION_NONE; | |
55 | ||
56 | hypervisor = ecx & 0x80000000U; | |
57 | ||
58 | if (hypervisor) { | |
59 | union { | |
60 | uint32_t sig32[3]; | |
61 | char text[13]; | |
62 | } sig = {}; | |
63 | int v; | |
64 | ||
65 | /* There is a hypervisor, see what it is */ | |
66 | __cpuid(0x40000000U, eax, ebx, ecx, edx); | |
67 | ||
68 | sig.sig32[0] = ebx; | |
69 | sig.sig32[1] = ecx; | |
70 | sig.sig32[2] = edx; | |
71 | ||
72 | log_debug("Virtualization found, CPUID=%s", sig.text); | |
73 | ||
74 | v = vm_from_string(sig.text); | |
75 | if (v < 0) | |
76 | return VIRTUALIZATION_VM_OTHER; | |
77 | ||
78 | return v; | |
79 | } | |
80 | #endif | |
81 | log_debug("No virtualization found in CPUID"); | |
82 | ||
83 | return VIRTUALIZATION_NONE; | |
84 | } | |
85 | ||
86 | 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 if (strstr(hvtype, "vmware")) | |
122 | return VIRTUALIZATION_VMWARE; | |
123 | else | |
124 | return VIRTUALIZATION_VM_OTHER; | |
125 | #else | |
126 | log_debug("This platform does not support /proc/device-tree"); | |
127 | return VIRTUALIZATION_NONE; | |
128 | #endif | |
129 | } | |
130 | ||
131 | static int detect_vm_dmi(void) { | |
132 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) | |
133 | ||
134 | static const char *const dmi_vendors[] = { | |
135 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ | |
136 | "/sys/class/dmi/id/sys_vendor", | |
137 | "/sys/class/dmi/id/board_vendor", | |
138 | "/sys/class/dmi/id/bios_vendor" | |
139 | }; | |
140 | ||
141 | static const struct { | |
142 | const char *vendor; | |
143 | int id; | |
144 | } dmi_vendor_table[] = { | |
145 | { "KVM", VIRTUALIZATION_KVM }, | |
146 | { "QEMU", VIRTUALIZATION_QEMU }, | |
147 | { "VMware", VIRTUALIZATION_VMWARE }, /* https://kb.vmware.com/s/article/1009458 */ | |
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 }, | |
154 | /* https://wiki.freebsd.org/bhyve */ | |
155 | { "BHYVE", VIRTUALIZATION_BHYVE }, | |
156 | }; | |
157 | unsigned i; | |
158 | int r; | |
159 | ||
160 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
161 | _cleanup_free_ char *s = NULL; | |
162 | unsigned j; | |
163 | ||
164 | r = read_one_line_file(dmi_vendors[i], &s); | |
165 | if (r < 0) { | |
166 | if (r == -ENOENT) | |
167 | continue; | |
168 | ||
169 | return r; | |
170 | } | |
171 | ||
172 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) | |
173 | if (startswith(s, dmi_vendor_table[j].vendor)) { | |
174 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
175 | return dmi_vendor_table[j].id; | |
176 | } | |
177 | } | |
178 | #endif | |
179 | ||
180 | log_debug("No virtualization found in DMI"); | |
181 | ||
182 | return VIRTUALIZATION_NONE; | |
183 | } | |
184 | ||
185 | static int detect_vm_xen(void) { | |
186 | ||
187 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 | |
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"); | |
191 | return VIRTUALIZATION_NONE; | |
192 | } | |
193 | ||
194 | log_debug("Virtualization XEN found (/proc/xen exists)"); | |
195 | return VIRTUALIZATION_XEN; | |
196 | } | |
197 | ||
198 | #define XENFEAT_dom0 11 /* xen/include/public/features.h */ | |
199 | #define PATH_FEATURES "/sys/hypervisor/properties/features" | |
200 | /* Returns -errno, or 0 for domU, or 1 for dom0 */ | |
201 | static int detect_vm_xen_dom0(void) { | |
202 | _cleanup_free_ char *domcap = NULL; | |
203 | int r; | |
204 | ||
205 | r = read_one_line_file(PATH_FEATURES, &domcap); | |
206 | if (r < 0 && r != -ENOENT) | |
207 | return r; | |
208 | if (r >= 0) { | |
209 | unsigned long features; | |
210 | ||
211 | /* Here, we need to use sscanf() instead of safe_atoul() | |
212 | * as the string lacks the leading "0x". */ | |
213 | r = sscanf(domcap, "%lx", &features); | |
214 | if (r == 1) { | |
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 | ||
225 | r = read_one_line_file("/proc/xen/capabilities", &domcap); | |
226 | if (r == -ENOENT) { | |
227 | log_debug("Virtualization XEN because /proc/xen/capabilities does not exist"); | |
228 | return 0; | |
229 | } | |
230 | if (r < 0) | |
231 | return r; | |
232 | ||
233 | for (const char *i = domcap;;) { | |
234 | _cleanup_free_ char *cap = NULL; | |
235 | ||
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 | } | |
249 | } | |
250 | ||
251 | static int detect_vm_hypervisor(void) { | |
252 | _cleanup_free_ char *hvtype = NULL; | |
253 | int r; | |
254 | ||
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; | |
260 | ||
261 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); | |
262 | ||
263 | if (streq(hvtype, "xen")) | |
264 | return VIRTUALIZATION_XEN; | |
265 | else | |
266 | return VIRTUALIZATION_VM_OTHER; | |
267 | } | |
268 | ||
269 | static int detect_vm_uml(void) { | |
270 | _cleanup_fclose_ FILE *f = NULL; | |
271 | int r; | |
272 | ||
273 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ | |
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; | |
281 | } | |
282 | ||
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 | } | |
302 | } | |
303 | ||
304 | log_debug("UML virtualization not found in /proc/cpuinfo."); | |
305 | return VIRTUALIZATION_NONE; | |
306 | } | |
307 | ||
308 | static int detect_vm_zvm(void) { | |
309 | ||
310 | #if defined(__s390__) | |
311 | _cleanup_free_ char *t = NULL; | |
312 | int r; | |
313 | ||
314 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); | |
315 | if (r == -ENOENT) | |
316 | return VIRTUALIZATION_NONE; | |
317 | if (r < 0) | |
318 | return r; | |
319 | ||
320 | log_debug("Virtualization %s found in /proc/sysinfo", t); | |
321 | if (streq(t, "z/VM")) | |
322 | return VIRTUALIZATION_ZVM; | |
323 | else | |
324 | return VIRTUALIZATION_KVM; | |
325 | #else | |
326 | log_debug("This platform does not support /proc/sysinfo"); | |
327 | return VIRTUALIZATION_NONE; | |
328 | #endif | |
329 | } | |
330 | ||
331 | /* Returns a short identifier for the various VM implementations */ | |
332 | int detect_vm(void) { | |
333 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
334 | bool other = false; | |
335 | int r, dmi; | |
336 | ||
337 | if (cached_found >= 0) | |
338 | return cached_found; | |
339 | ||
340 | /* We have to use the correct order here: | |
341 | * | |
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. */ | |
349 | ||
350 | dmi = detect_vm_dmi(); | |
351 | if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) { | |
352 | r = dmi; | |
353 | goto finish; | |
354 | } | |
355 | ||
356 | r = detect_vm_cpuid(); | |
357 | if (r < 0) | |
358 | return r; | |
359 | if (r == VIRTUALIZATION_VM_OTHER) | |
360 | other = true; | |
361 | else if (r != VIRTUALIZATION_NONE) | |
362 | goto finish; | |
363 | ||
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; | |
372 | } | |
373 | ||
374 | /* x86 xen will most likely be detected by cpuid. If not (most likely | |
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. | |
378 | */ | |
379 | ||
380 | r = detect_vm_xen(); | |
381 | if (r < 0) | |
382 | return r; | |
383 | if (r == VIRTUALIZATION_VM_OTHER) | |
384 | other = true; | |
385 | else if (r != VIRTUALIZATION_NONE) | |
386 | goto finish; | |
387 | ||
388 | r = detect_vm_hypervisor(); | |
389 | if (r < 0) | |
390 | return r; | |
391 | if (r == VIRTUALIZATION_VM_OTHER) | |
392 | other = true; | |
393 | else if (r != VIRTUALIZATION_NONE) | |
394 | goto finish; | |
395 | ||
396 | r = detect_vm_device_tree(); | |
397 | if (r < 0) | |
398 | return r; | |
399 | if (r == VIRTUALIZATION_VM_OTHER) | |
400 | other = true; | |
401 | else if (r != VIRTUALIZATION_NONE) | |
402 | goto finish; | |
403 | ||
404 | r = detect_vm_uml(); | |
405 | if (r < 0) | |
406 | return r; | |
407 | if (r == VIRTUALIZATION_VM_OTHER) | |
408 | other = true; | |
409 | else if (r != VIRTUALIZATION_NONE) | |
410 | goto finish; | |
411 | ||
412 | r = detect_vm_zvm(); | |
413 | if (r < 0) | |
414 | return r; | |
415 | ||
416 | finish: | |
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 */ | |
420 | if (r == VIRTUALIZATION_XEN) { | |
421 | int dom0; | |
422 | ||
423 | dom0 = detect_vm_xen_dom0(); | |
424 | if (dom0 < 0) | |
425 | return dom0; | |
426 | if (dom0 > 0) | |
427 | r = VIRTUALIZATION_NONE; | |
428 | } else if (r == VIRTUALIZATION_NONE && other) | |
429 | r = VIRTUALIZATION_VM_OTHER; | |
430 | ||
431 | cached_found = r; | |
432 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); | |
433 | return r; | |
434 | } | |
435 | ||
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 | }; | |
445 | ||
446 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_FROM_STRING(container, int); | |
447 | ||
448 | int detect_container(void) { | |
449 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
450 | _cleanup_free_ char *m = NULL; | |
451 | _cleanup_free_ char *o = NULL; | |
452 | const char *e = NULL; | |
453 | int r; | |
454 | ||
455 | if (cached_found >= 0) | |
456 | return cached_found; | |
457 | ||
458 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ | |
459 | if (access("/proc/vz", F_OK) >= 0 && | |
460 | access("/proc/bc", F_OK) < 0) { | |
461 | r = VIRTUALIZATION_OPENVZ; | |
462 | goto finish; | |
463 | } | |
464 | ||
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 | */ | |
468 | r = read_one_line_file("/proc/sys/kernel/osrelease", &o); | |
469 | if (r >= 0 && | |
470 | (strstr(o, "Microsoft") || strstr(o, "microsoft") || strstr(o, "WSL"))) { | |
471 | r = VIRTUALIZATION_WSL; | |
472 | goto finish; | |
473 | } | |
474 | ||
475 | if (getpid_cached() == 1) { | |
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 | */ | |
482 | e = getenv("container"); | |
483 | if (!e) | |
484 | goto check_sched; | |
485 | if (isempty(e)) { | |
486 | r = VIRTUALIZATION_NONE; | |
487 | goto finish; | |
488 | } | |
489 | ||
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); | |
496 | if (r > 0) { | |
497 | e = m; | |
498 | goto translate_name; | |
499 | } | |
500 | if (!IN_SET(r, -ENOENT, 0)) | |
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) { | |
506 | e = m; | |
507 | goto translate_name; | |
508 | } | |
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 | ||
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: | |
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; | |
533 | ||
534 | translate_name: | |
535 | r = container_from_string(e); | |
536 | if (r < 0) | |
537 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
538 | ||
539 | finish: | |
540 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); | |
541 | cached_found = r; | |
542 | return r; | |
543 | } | |
544 | ||
545 | int detect_virtualization(void) { | |
546 | int r; | |
547 | ||
548 | r = detect_container(); | |
549 | if (r == 0) | |
550 | r = detect_vm(); | |
551 | ||
552 | return r; | |
553 | } | |
554 | ||
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); | |
566 | return errno == ENOENT ? false : -errno; | |
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 | ||
625 | int running_in_chroot(void) { | |
626 | int r; | |
627 | ||
628 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) | |
629 | return 0; | |
630 | ||
631 | r = files_same("/proc/1/root", "/", 0); | |
632 | if (r < 0) | |
633 | return r; | |
634 | ||
635 | return r == 0; | |
636 | } | |
637 | ||
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", | |
650 | [VIRTUALIZATION_BHYVE] = "bhyve", | |
651 | [VIRTUALIZATION_QNX] = "qnx", | |
652 | [VIRTUALIZATION_ACRN] = "acrn", | |
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", | |
660 | [VIRTUALIZATION_PODMAN] = "podman", | |
661 | [VIRTUALIZATION_RKT] = "rkt", | |
662 | [VIRTUALIZATION_WSL] = "wsl", | |
663 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", | |
664 | }; | |
665 | ||
666 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |