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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b52aae1d LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2011 Lennart Poettering | |
b52aae1d LP |
6 | ***/ |
7 | ||
d31b0033 MG |
8 | #if defined(__i386__) || defined(__x86_64__) |
9 | #include <cpuid.h> | |
10 | #endif | |
b52aae1d | 11 | #include <errno.h> |
11c3a366 TA |
12 | #include <stdint.h> |
13 | #include <stdlib.h> | |
07630cea | 14 | #include <string.h> |
b52aae1d LP |
15 | #include <unistd.h> |
16 | ||
b5efdb8a | 17 | #include "alloc-util.h" |
ade61d3b | 18 | #include "dirent-util.h" |
295ee984 | 19 | #include "env-util.h" |
ade61d3b | 20 | #include "fd-util.h" |
07630cea | 21 | #include "fileio.h" |
11c3a366 | 22 | #include "macro.h" |
93cc7779 | 23 | #include "process-util.h" |
b5efdb8a | 24 | #include "stat-util.h" |
8b43440b | 25 | #include "string-table.h" |
07630cea | 26 | #include "string-util.h" |
b52aae1d LP |
27 | #include "virt.h" |
28 | ||
75f86906 | 29 | static int detect_vm_cpuid(void) { |
b52aae1d | 30 | |
2ef8a4c4 | 31 | /* CPUID is an x86 specific interface. */ |
bdb628ee | 32 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 33 | |
75f86906 LP |
34 | static const struct { |
35 | const char *cpuid; | |
36 | int id; | |
37 | } cpuid_vendor_table[] = { | |
38 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
39 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
5588612e | 40 | { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU }, |
b52aae1d | 41 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 42 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
ff85f271 | 43 | /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ |
75f86906 | 44 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
aa0c3427 LBS |
45 | /* https://wiki.freebsd.org/bhyve */ |
46 | { "bhyve bhyve ", VIRTUALIZATION_BHYVE }, | |
1fdf07f5 | 47 | { "QNXQVMBSQG", VIRTUALIZATION_QNX }, |
75f86906 | 48 | }; |
b52aae1d | 49 | |
d31b0033 | 50 | uint32_t eax, ebx, ecx, edx; |
b52aae1d LP |
51 | bool hypervisor; |
52 | ||
53 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d | 54 | |
b52aae1d | 55 | /* First detect whether there is a hypervisor */ |
d31b0033 MG |
56 | if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0) |
57 | return VIRTUALIZATION_NONE; | |
b52aae1d LP |
58 | |
59 | hypervisor = !!(ecx & 0x80000000U); | |
60 | ||
61 | if (hypervisor) { | |
75f86906 LP |
62 | union { |
63 | uint32_t sig32[3]; | |
64 | char text[13]; | |
65 | } sig = {}; | |
66 | unsigned j; | |
b52aae1d LP |
67 | |
68 | /* There is a hypervisor, see what it is */ | |
8481e3e7 | 69 | __cpuid(0x40000000U, eax, ebx, ecx, edx); |
d31b0033 MG |
70 | |
71 | sig.sig32[0] = ebx; | |
72 | sig.sig32[1] = ecx; | |
73 | sig.sig32[2] = edx; | |
b52aae1d | 74 | |
9f63a08d SS |
75 | log_debug("Virtualization found, CPUID=%s", sig.text); |
76 | ||
75f86906 LP |
77 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
78 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
79 | return cpuid_vendor_table[j].id; | |
bdb628ee | 80 | |
75f86906 | 81 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 82 | } |
bdb628ee | 83 | #endif |
9f63a08d | 84 | log_debug("No virtualization found in CPUID"); |
bdb628ee | 85 | |
75f86906 | 86 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
87 | } |
88 | ||
75f86906 | 89 | static int detect_vm_device_tree(void) { |
db6a8689 | 90 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
91 | _cleanup_free_ char *hvtype = NULL; |
92 | int r; | |
93 | ||
b8f1df82 | 94 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 95 | if (r == -ENOENT) { |
ce09c71d AJ |
96 | _cleanup_closedir_ DIR *dir = NULL; |
97 | struct dirent *dent; | |
98 | ||
99 | dir = opendir("/proc/device-tree"); | |
100 | if (!dir) { | |
9f63a08d SS |
101 | if (errno == ENOENT) { |
102 | log_debug_errno(errno, "/proc/device-tree: %m"); | |
75f86906 | 103 | return VIRTUALIZATION_NONE; |
9f63a08d | 104 | } |
ce09c71d AJ |
105 | return -errno; |
106 | } | |
107 | ||
75f86906 | 108 | FOREACH_DIRENT(dent, dir, return -errno) |
9f63a08d SS |
109 | if (strstr(dent->d_name, "fw-cfg")) { |
110 | log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); | |
75f86906 | 111 | return VIRTUALIZATION_QEMU; |
9f63a08d | 112 | } |
75f86906 | 113 | |
9f63a08d | 114 | log_debug("No virtualization found in /proc/device-tree/*"); |
75f86906 LP |
115 | return VIRTUALIZATION_NONE; |
116 | } else if (r < 0) | |
117 | return r; | |
118 | ||
9f63a08d | 119 | log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
75f86906 LP |
120 | if (streq(hvtype, "linux,kvm")) |
121 | return VIRTUALIZATION_KVM; | |
122 | else if (strstr(hvtype, "xen")) | |
123 | return VIRTUALIZATION_XEN; | |
124 | else | |
125 | return VIRTUALIZATION_VM_OTHER; | |
126 | #else | |
9f63a08d | 127 | log_debug("This platform does not support /proc/device-tree"); |
75f86906 | 128 | return VIRTUALIZATION_NONE; |
d831deb5 | 129 | #endif |
d831deb5 CA |
130 | } |
131 | ||
75f86906 | 132 | static int detect_vm_dmi(void) { |
2ef8a4c4 | 133 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
bdb628ee ZJS |
134 | |
135 | static const char *const dmi_vendors[] = { | |
3728dcde | 136 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
bdb628ee ZJS |
137 | "/sys/class/dmi/id/sys_vendor", |
138 | "/sys/class/dmi/id/board_vendor", | |
139 | "/sys/class/dmi/id/bios_vendor" | |
140 | }; | |
141 | ||
75f86906 LP |
142 | static const struct { |
143 | const char *vendor; | |
144 | int id; | |
145 | } dmi_vendor_table[] = { | |
3728dcde | 146 | { "KVM", VIRTUALIZATION_KVM }, |
75f86906 | 147 | { "QEMU", VIRTUALIZATION_QEMU }, |
bdb628ee | 148 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
149 | { "VMware", VIRTUALIZATION_VMWARE }, |
150 | { "VMW", VIRTUALIZATION_VMWARE }, | |
151 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
152 | { "Xen", VIRTUALIZATION_XEN }, | |
153 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
154 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
aa0c3427 LBS |
155 | /* https://wiki.freebsd.org/bhyve */ |
156 | { "BHYVE", VIRTUALIZATION_BHYVE }, | |
75f86906 | 157 | }; |
bdb628ee | 158 | unsigned i; |
75f86906 | 159 | int r; |
b52aae1d LP |
160 | |
161 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 162 | _cleanup_free_ char *s = NULL; |
75f86906 | 163 | unsigned j; |
b52aae1d | 164 | |
b1b8e816 LP |
165 | r = read_one_line_file(dmi_vendors[i], &s); |
166 | if (r < 0) { | |
75f86906 LP |
167 | if (r == -ENOENT) |
168 | continue; | |
b52aae1d | 169 | |
75f86906 | 170 | return r; |
b52aae1d LP |
171 | } |
172 | ||
75f86906 | 173 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
9f63a08d SS |
174 | if (startswith(s, dmi_vendor_table[j].vendor)) { |
175 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
75f86906 | 176 | return dmi_vendor_table[j].id; |
9f63a08d | 177 | } |
b52aae1d | 178 | } |
bdb628ee ZJS |
179 | #endif |
180 | ||
9f63a08d SS |
181 | log_debug("No virtualization found in DMI"); |
182 | ||
75f86906 | 183 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
184 | } |
185 | ||
75f86906 | 186 | static int detect_vm_xen(void) { |
45e1c7d5 | 187 | |
3f61278b | 188 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
87dc723a OH |
189 | The presence of /proc/xen indicates some form of a Xen domain */ |
190 | if (access("/proc/xen", F_OK) < 0) { | |
191 | log_debug("Virtualization XEN not found, /proc/xen does not exist"); | |
3f61278b SS |
192 | return VIRTUALIZATION_NONE; |
193 | } | |
194 | ||
87dc723a | 195 | log_debug("Virtualization XEN found (/proc/xen exists)"); |
45e1c7d5 | 196 | return VIRTUALIZATION_XEN; |
3f61278b SS |
197 | } |
198 | ||
575e6588 OH |
199 | #define XENFEAT_dom0 11 /* xen/include/public/features.h */ |
200 | #define PATH_FEATURES "/sys/hypervisor/properties/features" | |
1a8e4148 OH |
201 | /* Returns -errno, or 0 for domU, or 1 for dom0 */ |
202 | static int detect_vm_xen_dom0(void) { | |
75f86906 LP |
203 | _cleanup_free_ char *domcap = NULL; |
204 | char *cap, *i; | |
bdb628ee | 205 | int r; |
b52aae1d | 206 | |
575e6588 OH |
207 | r = read_one_line_file(PATH_FEATURES, &domcap); |
208 | if (r < 0 && r != -ENOENT) | |
209 | return r; | |
210 | if (r == 0) { | |
211 | unsigned long features; | |
212 | ||
47dbb99a YW |
213 | /* Here, we need to use sscanf() instead of safe_atoul() |
214 | * as the string lacks the leading "0x". */ | |
13e0f9fe OH |
215 | r = sscanf(domcap, "%lx", &features); |
216 | if (r == 1) { | |
575e6588 OH |
217 | r = !!(features & (1U << XENFEAT_dom0)); |
218 | log_debug("Virtualization XEN, found %s with value %08lx, " | |
219 | "XENFEAT_dom0 (indicating the 'hardware domain') is%s set.", | |
220 | PATH_FEATURES, features, r ? "" : " not"); | |
221 | return r; | |
222 | } | |
223 | log_debug("Virtualization XEN, found %s, unhandled content '%s'", | |
224 | PATH_FEATURES, domcap); | |
225 | } | |
226 | ||
75f86906 | 227 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
9f63a08d | 228 | if (r == -ENOENT) { |
1a8e4148 OH |
229 | log_debug("Virtualization XEN because /proc/xen/capabilities does not exist"); |
230 | return 0; | |
9f63a08d | 231 | } |
d5b687e7 LP |
232 | if (r < 0) |
233 | return r; | |
bdb628ee | 234 | |
75f86906 LP |
235 | i = domcap; |
236 | while ((cap = strsep(&i, ","))) | |
237 | if (streq(cap, "control_d")) | |
238 | break; | |
9f63a08d SS |
239 | if (!cap) { |
240 | log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)"); | |
1a8e4148 | 241 | return 0; |
9f63a08d SS |
242 | } |
243 | ||
244 | log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); | |
1a8e4148 | 245 | return 1; |
75f86906 | 246 | } |
37287585 | 247 | |
75f86906 LP |
248 | static int detect_vm_hypervisor(void) { |
249 | _cleanup_free_ char *hvtype = NULL; | |
250 | int r; | |
37287585 | 251 | |
75f86906 LP |
252 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
253 | if (r == -ENOENT) | |
254 | return VIRTUALIZATION_NONE; | |
255 | if (r < 0) | |
256 | return r; | |
37287585 | 257 | |
9f63a08d SS |
258 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
259 | ||
75f86906 LP |
260 | if (streq(hvtype, "xen")) |
261 | return VIRTUALIZATION_XEN; | |
262 | else | |
263 | return VIRTUALIZATION_VM_OTHER; | |
264 | } | |
37287585 | 265 | |
75f86906 LP |
266 | static int detect_vm_uml(void) { |
267 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
268 | int r; | |
37287585 | 269 | |
75f86906 LP |
270 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
271 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
ef2a48aa ZJS |
272 | if (r == -ENOENT) { |
273 | log_debug("/proc/cpuinfo not found, assuming no UML virtualization."); | |
274 | return VIRTUALIZATION_NONE; | |
275 | } | |
75f86906 | 276 | if (r < 0) |
bdb628ee | 277 | return r; |
9f63a08d SS |
278 | |
279 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) { | |
280 | log_debug("UML virtualization found in /proc/cpuinfo"); | |
75f86906 | 281 | return VIRTUALIZATION_UML; |
9f63a08d | 282 | } |
bdb628ee | 283 | |
ef2a48aa | 284 | log_debug("UML virtualization not found in /proc/cpuinfo."); |
75f86906 LP |
285 | return VIRTUALIZATION_NONE; |
286 | } | |
e32886e0 | 287 | |
75f86906 | 288 | static int detect_vm_zvm(void) { |
bdb628ee | 289 | |
75f86906 LP |
290 | #if defined(__s390__) |
291 | _cleanup_free_ char *t = NULL; | |
292 | int r; | |
e32886e0 | 293 | |
c4cd1d4d | 294 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
295 | if (r == -ENOENT) |
296 | return VIRTUALIZATION_NONE; | |
297 | if (r < 0) | |
298 | return r; | |
e32886e0 | 299 | |
9f63a08d | 300 | log_debug("Virtualization %s found in /proc/sysinfo", t); |
75f86906 LP |
301 | if (streq(t, "z/VM")) |
302 | return VIRTUALIZATION_ZVM; | |
303 | else | |
304 | return VIRTUALIZATION_KVM; | |
305 | #else | |
9f63a08d | 306 | log_debug("This platform does not support /proc/sysinfo"); |
75f86906 LP |
307 | return VIRTUALIZATION_NONE; |
308 | #endif | |
309 | } | |
e32886e0 | 310 | |
75f86906 LP |
311 | /* Returns a short identifier for the various VM implementations */ |
312 | int detect_vm(void) { | |
313 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
28b1a3ea | 314 | int r, dmi; |
530c1c30 | 315 | bool other = false; |
e32886e0 | 316 | |
75f86906 LP |
317 | if (cached_found >= 0) |
318 | return cached_found; | |
bdb628ee | 319 | |
f6875b0a | 320 | /* We have to use the correct order here: |
f6875b0a | 321 | * |
f2fe2865 LP |
322 | * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft |
323 | * Hyper-V. | |
324 | * | |
325 | * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is | |
326 | * overwritten. | |
327 | * | |
328 | * → Third, try to detect from DMI. */ | |
5f1c788c | 329 | |
28b1a3ea | 330 | dmi = detect_vm_dmi(); |
f2fe2865 | 331 | if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) { |
2f8e375d BR |
332 | r = dmi; |
333 | goto finish; | |
334 | } | |
5f1c788c | 335 | |
28b1a3ea | 336 | r = detect_vm_cpuid(); |
75f86906 LP |
337 | if (r < 0) |
338 | return r; | |
530c1c30 RC |
339 | if (r != VIRTUALIZATION_NONE) { |
340 | if (r == VIRTUALIZATION_VM_OTHER) | |
341 | other = true; | |
342 | else | |
343 | goto finish; | |
344 | } | |
d831deb5 | 345 | |
28b1a3ea | 346 | r = dmi; |
75f86906 LP |
347 | if (r < 0) |
348 | return r; | |
530c1c30 RC |
349 | if (r != VIRTUALIZATION_NONE) { |
350 | if (r == VIRTUALIZATION_VM_OTHER) | |
351 | other = true; | |
352 | else | |
353 | goto finish; | |
354 | } | |
b52aae1d | 355 | |
42685451 | 356 | /* x86 xen will most likely be detected by cpuid. If not (most likely |
87dc723a OH |
357 | * because we're not an x86 guest), then we should try the /proc/xen |
358 | * directory next. If that's not found, then we check for the high-level | |
359 | * hypervisor sysfs file. | |
2f5fa62b | 360 | */ |
42685451 AJ |
361 | |
362 | r = detect_vm_xen(); | |
7080ea16 RR |
363 | if (r < 0) |
364 | return r; | |
530c1c30 RC |
365 | if (r != VIRTUALIZATION_NONE) { |
366 | if (r == VIRTUALIZATION_VM_OTHER) | |
367 | other = true; | |
368 | else | |
369 | goto finish; | |
370 | } | |
7080ea16 | 371 | |
75f86906 LP |
372 | r = detect_vm_hypervisor(); |
373 | if (r < 0) | |
374 | return r; | |
530c1c30 RC |
375 | if (r != VIRTUALIZATION_NONE) { |
376 | if (r == VIRTUALIZATION_VM_OTHER) | |
377 | other = true; | |
378 | else | |
379 | goto finish; | |
380 | } | |
f41925b4 | 381 | |
75f86906 LP |
382 | r = detect_vm_device_tree(); |
383 | if (r < 0) | |
384 | return r; | |
530c1c30 RC |
385 | if (r != VIRTUALIZATION_NONE) { |
386 | if (r == VIRTUALIZATION_VM_OTHER) | |
387 | other = true; | |
388 | else | |
389 | goto finish; | |
390 | } | |
f41925b4 | 391 | |
75f86906 LP |
392 | r = detect_vm_uml(); |
393 | if (r < 0) | |
394 | return r; | |
530c1c30 RC |
395 | if (r != VIRTUALIZATION_NONE) { |
396 | if (r == VIRTUALIZATION_VM_OTHER) | |
397 | other = true; | |
398 | else | |
399 | goto finish; | |
400 | } | |
f41925b4 | 401 | |
75f86906 LP |
402 | r = detect_vm_zvm(); |
403 | if (r < 0) | |
404 | return r; | |
0fb533a5 LP |
405 | |
406 | finish: | |
3f61278b SS |
407 | /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
408 | * In order to detect the Dom0 as not virtualization we need to | |
409 | * double-check it */ | |
1a8e4148 OH |
410 | if (r == VIRTUALIZATION_XEN) { |
411 | int ret = detect_vm_xen_dom0(); | |
412 | if (ret < 0) | |
413 | return ret; | |
414 | if (ret > 0) | |
415 | r = VIRTUALIZATION_NONE; | |
416 | } else if (r == VIRTUALIZATION_NONE && other) | |
530c1c30 | 417 | r = VIRTUALIZATION_VM_OTHER; |
3f61278b | 418 | |
0fb533a5 | 419 | cached_found = r; |
9f63a08d | 420 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
0fb533a5 | 421 | return r; |
b52aae1d LP |
422 | } |
423 | ||
75f86906 | 424 | int detect_container(void) { |
0fb533a5 | 425 | |
75f86906 LP |
426 | static const struct { |
427 | const char *value; | |
428 | int id; | |
429 | } value_table[] = { | |
430 | { "lxc", VIRTUALIZATION_LXC }, | |
431 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
432 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
433 | { "docker", VIRTUALIZATION_DOCKER }, | |
9fb16425 | 434 | { "rkt", VIRTUALIZATION_RKT }, |
75f86906 | 435 | }; |
0fb533a5 | 436 | |
75f86906 | 437 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 438 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
439 | const char *e = NULL; |
440 | unsigned j; | |
ab94af92 | 441 | int r; |
b52aae1d | 442 | |
75f86906 | 443 | if (cached_found >= 0) |
0fb533a5 | 444 | return cached_found; |
0fb533a5 | 445 | |
8d6e8034 | 446 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
b52aae1d LP |
447 | if (access("/proc/vz", F_OK) >= 0 && |
448 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 449 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 450 | goto finish; |
b52aae1d LP |
451 | } |
452 | ||
df0ff127 | 453 | if (getpid_cached() == 1) { |
8d6e8034 | 454 | /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */ |
fdd25311 LP |
455 | |
456 | e = getenv("container"); | |
457 | if (isempty(e)) { | |
75f86906 | 458 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
459 | goto finish; |
460 | } | |
fdd25311 | 461 | |
8d6e8034 LP |
462 | goto translate_name; |
463 | } | |
464 | ||
465 | /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing | |
466 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */ | |
467 | r = read_one_line_file("/run/systemd/container", &m); | |
468 | if (r >= 0) { | |
469 | e = m; | |
470 | goto translate_name; | |
471 | } | |
472 | if (r != -ENOENT) | |
473 | return log_debug_errno(r, "Failed to read /run/systemd/container: %m"); | |
474 | ||
475 | /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */ | |
476 | r = getenv_for_pid(1, "container", &m); | |
477 | if (r > 0) { | |
fdd25311 | 478 | e = m; |
8d6e8034 | 479 | goto translate_name; |
fdd25311 | 480 | } |
8d6e8034 LP |
481 | if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */ |
482 | log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m"); | |
483 | ||
484 | /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown | |
485 | * there is not 1, we know we are in a PID namespace. and hence a container. */ | |
486 | r = read_one_line_file("/proc/1/sched", &m); | |
487 | if (r >= 0) { | |
488 | const char *t; | |
489 | ||
490 | t = strrchr(m, '('); | |
491 | if (!t) | |
492 | return -EIO; | |
493 | ||
494 | if (!startswith(t, "(1,")) { | |
495 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
496 | goto finish; | |
497 | } | |
498 | } else if (r != -ENOENT) | |
499 | return r; | |
500 | ||
501 | /* If that didn't work, give up, assume no container manager. */ | |
502 | r = VIRTUALIZATION_NONE; | |
503 | goto finish; | |
b52aae1d | 504 | |
8d6e8034 | 505 | translate_name: |
75f86906 LP |
506 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
507 | if (streq(e, value_table[j].value)) { | |
508 | r = value_table[j].id; | |
509 | goto finish; | |
510 | } | |
0fb533a5 | 511 | |
f499daf4 | 512 | r = VIRTUALIZATION_CONTAINER_OTHER; |
fdd25311 | 513 | |
0fb533a5 | 514 | finish: |
8d6e8034 | 515 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
0fb533a5 | 516 | cached_found = r; |
ab94af92 | 517 | return r; |
b52aae1d LP |
518 | } |
519 | ||
75f86906 | 520 | int detect_virtualization(void) { |
b52aae1d | 521 | int r; |
b52aae1d | 522 | |
75f86906 | 523 | r = detect_container(); |
9f63a08d SS |
524 | if (r == 0) |
525 | r = detect_vm(); | |
b52aae1d | 526 | |
9f63a08d | 527 | return r; |
b52aae1d | 528 | } |
75f86906 | 529 | |
299a34c1 ZJS |
530 | static int userns_has_mapping(const char *name) { |
531 | _cleanup_fclose_ FILE *f = NULL; | |
532 | _cleanup_free_ char *buf = NULL; | |
533 | size_t n_allocated = 0; | |
534 | ssize_t n; | |
535 | uint32_t a, b, c; | |
536 | int r; | |
537 | ||
538 | f = fopen(name, "re"); | |
539 | if (!f) { | |
540 | log_debug_errno(errno, "Failed to open %s: %m", name); | |
abd67ce7 | 541 | return errno == ENOENT ? false : -errno; |
299a34c1 ZJS |
542 | } |
543 | ||
544 | n = getline(&buf, &n_allocated, f); | |
545 | if (n < 0) { | |
546 | if (feof(f)) { | |
547 | log_debug("%s is empty, we're in an uninitialized user namespace", name); | |
548 | return true; | |
549 | } | |
550 | ||
551 | return log_debug_errno(errno, "Failed to read %s: %m", name); | |
552 | } | |
553 | ||
554 | r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); | |
555 | if (r < 3) | |
556 | return log_debug_errno(errno, "Failed to parse %s: %m", name); | |
557 | ||
558 | if (a == 0 && b == 0 && c == UINT32_MAX) { | |
559 | /* The kernel calls mappings_overlap() and does not allow overlaps */ | |
560 | log_debug("%s has a full 1:1 mapping", name); | |
561 | return false; | |
562 | } | |
563 | ||
564 | /* Anything else implies that we are in a user namespace */ | |
565 | log_debug("Mapping found in %s, we're in a user namespace", name); | |
566 | return true; | |
567 | } | |
568 | ||
569 | int running_in_userns(void) { | |
570 | _cleanup_free_ char *line = NULL; | |
571 | int r; | |
572 | ||
573 | r = userns_has_mapping("/proc/self/uid_map"); | |
574 | if (r != 0) | |
575 | return r; | |
576 | ||
577 | r = userns_has_mapping("/proc/self/gid_map"); | |
578 | if (r != 0) | |
579 | return r; | |
580 | ||
581 | /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also | |
582 | * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" | |
583 | * also does not exist. We cannot distinguish those two cases, so assume that | |
584 | * we're running on a stripped-down recent kernel, rather than on an old one, | |
585 | * and if the file is not found, return false. | |
586 | */ | |
587 | r = read_one_line_file("/proc/self/setgroups", &line); | |
588 | if (r < 0) { | |
589 | log_debug_errno(r, "/proc/self/setgroups: %m"); | |
590 | return r == -ENOENT ? false : r; | |
591 | } | |
592 | ||
593 | truncate_nl(line); | |
594 | r = streq(line, "deny"); | |
595 | /* See user_namespaces(7) for a description of this "setgroups" contents. */ | |
596 | log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); | |
597 | return r; | |
598 | } | |
599 | ||
7f4b3c5e | 600 | int running_in_chroot(void) { |
ef2a48aa | 601 | int r; |
7f4b3c5e | 602 | |
08a28eec LN |
603 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
604 | return 0; | |
605 | ||
ef2a48aa ZJS |
606 | r = files_same("/proc/1/root", "/", 0); |
607 | if (r < 0) | |
608 | return r; | |
7f4b3c5e | 609 | |
ef2a48aa | 610 | return r == 0; |
7f4b3c5e LP |
611 | } |
612 | ||
75f86906 LP |
613 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
614 | [VIRTUALIZATION_NONE] = "none", | |
615 | [VIRTUALIZATION_KVM] = "kvm", | |
616 | [VIRTUALIZATION_QEMU] = "qemu", | |
617 | [VIRTUALIZATION_BOCHS] = "bochs", | |
618 | [VIRTUALIZATION_XEN] = "xen", | |
619 | [VIRTUALIZATION_UML] = "uml", | |
620 | [VIRTUALIZATION_VMWARE] = "vmware", | |
621 | [VIRTUALIZATION_ORACLE] = "oracle", | |
622 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
623 | [VIRTUALIZATION_ZVM] = "zvm", | |
624 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
aa0c3427 | 625 | [VIRTUALIZATION_BHYVE] = "bhyve", |
1fdf07f5 | 626 | [VIRTUALIZATION_QNX] = "qnx", |
75f86906 LP |
627 | [VIRTUALIZATION_VM_OTHER] = "vm-other", |
628 | ||
629 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
630 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
631 | [VIRTUALIZATION_LXC] = "lxc", | |
632 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
633 | [VIRTUALIZATION_DOCKER] = "docker", | |
9fb16425 | 634 | [VIRTUALIZATION_RKT] = "rkt", |
75f86906 LP |
635 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
636 | }; | |
637 | ||
638 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |