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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
b52aae1d | 2 | /*** |
b52aae1d | 3 | Copyright 2011 Lennart Poettering |
b52aae1d LP |
4 | ***/ |
5 | ||
d31b0033 MG |
6 | #if defined(__i386__) || defined(__x86_64__) |
7 | #include <cpuid.h> | |
8 | #endif | |
b52aae1d | 9 | #include <errno.h> |
11c3a366 TA |
10 | #include <stdint.h> |
11 | #include <stdlib.h> | |
07630cea | 12 | #include <string.h> |
b52aae1d LP |
13 | #include <unistd.h> |
14 | ||
b5efdb8a | 15 | #include "alloc-util.h" |
ade61d3b | 16 | #include "dirent-util.h" |
295ee984 | 17 | #include "env-util.h" |
ade61d3b | 18 | #include "fd-util.h" |
07630cea | 19 | #include "fileio.h" |
11c3a366 | 20 | #include "macro.h" |
93cc7779 | 21 | #include "process-util.h" |
b5efdb8a | 22 | #include "stat-util.h" |
8b43440b | 23 | #include "string-table.h" |
07630cea | 24 | #include "string-util.h" |
b52aae1d LP |
25 | #include "virt.h" |
26 | ||
75f86906 | 27 | static int detect_vm_cpuid(void) { |
b52aae1d | 28 | |
2ef8a4c4 | 29 | /* CPUID is an x86 specific interface. */ |
bdb628ee | 30 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 31 | |
75f86906 LP |
32 | static const struct { |
33 | const char *cpuid; | |
34 | int id; | |
35 | } cpuid_vendor_table[] = { | |
36 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
37 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
5588612e | 38 | { "TCGTCGTCGTCG", VIRTUALIZATION_QEMU }, |
b52aae1d | 39 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 40 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
ff85f271 | 41 | /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ |
75f86906 | 42 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
aa0c3427 LBS |
43 | /* https://wiki.freebsd.org/bhyve */ |
44 | { "bhyve bhyve ", VIRTUALIZATION_BHYVE }, | |
1fdf07f5 | 45 | { "QNXQVMBSQG", VIRTUALIZATION_QNX }, |
75f86906 | 46 | }; |
b52aae1d | 47 | |
d31b0033 | 48 | uint32_t eax, ebx, ecx, edx; |
b52aae1d LP |
49 | bool hypervisor; |
50 | ||
51 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d | 52 | |
b52aae1d | 53 | /* First detect whether there is a hypervisor */ |
d31b0033 MG |
54 | if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0) |
55 | return VIRTUALIZATION_NONE; | |
b52aae1d | 56 | |
5d904a6a | 57 | hypervisor = ecx & 0x80000000U; |
b52aae1d LP |
58 | |
59 | if (hypervisor) { | |
75f86906 LP |
60 | union { |
61 | uint32_t sig32[3]; | |
62 | char text[13]; | |
63 | } sig = {}; | |
64 | unsigned j; | |
b52aae1d LP |
65 | |
66 | /* There is a hypervisor, see what it is */ | |
8481e3e7 | 67 | __cpuid(0x40000000U, eax, ebx, ecx, edx); |
d31b0033 MG |
68 | |
69 | sig.sig32[0] = ebx; | |
70 | sig.sig32[1] = ecx; | |
71 | sig.sig32[2] = edx; | |
b52aae1d | 72 | |
9f63a08d SS |
73 | log_debug("Virtualization found, CPUID=%s", sig.text); |
74 | ||
75f86906 LP |
75 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
76 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
77 | return cpuid_vendor_table[j].id; | |
bdb628ee | 78 | |
75f86906 | 79 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 80 | } |
bdb628ee | 81 | #endif |
9f63a08d | 82 | log_debug("No virtualization found in CPUID"); |
bdb628ee | 83 | |
75f86906 | 84 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
85 | } |
86 | ||
75f86906 | 87 | static int detect_vm_device_tree(void) { |
db6a8689 | 88 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
89 | _cleanup_free_ char *hvtype = NULL; |
90 | int r; | |
91 | ||
b8f1df82 | 92 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 93 | if (r == -ENOENT) { |
ce09c71d AJ |
94 | _cleanup_closedir_ DIR *dir = NULL; |
95 | struct dirent *dent; | |
96 | ||
97 | dir = opendir("/proc/device-tree"); | |
98 | if (!dir) { | |
9f63a08d SS |
99 | if (errno == ENOENT) { |
100 | log_debug_errno(errno, "/proc/device-tree: %m"); | |
75f86906 | 101 | return VIRTUALIZATION_NONE; |
9f63a08d | 102 | } |
ce09c71d AJ |
103 | return -errno; |
104 | } | |
105 | ||
75f86906 | 106 | FOREACH_DIRENT(dent, dir, return -errno) |
9f63a08d SS |
107 | if (strstr(dent->d_name, "fw-cfg")) { |
108 | log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); | |
75f86906 | 109 | return VIRTUALIZATION_QEMU; |
9f63a08d | 110 | } |
75f86906 | 111 | |
9f63a08d | 112 | log_debug("No virtualization found in /proc/device-tree/*"); |
75f86906 LP |
113 | return VIRTUALIZATION_NONE; |
114 | } else if (r < 0) | |
115 | return r; | |
116 | ||
9f63a08d | 117 | log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
75f86906 LP |
118 | if (streq(hvtype, "linux,kvm")) |
119 | return VIRTUALIZATION_KVM; | |
120 | else if (strstr(hvtype, "xen")) | |
121 | return VIRTUALIZATION_XEN; | |
122 | else | |
123 | return VIRTUALIZATION_VM_OTHER; | |
124 | #else | |
9f63a08d | 125 | log_debug("This platform does not support /proc/device-tree"); |
75f86906 | 126 | return VIRTUALIZATION_NONE; |
d831deb5 | 127 | #endif |
d831deb5 CA |
128 | } |
129 | ||
75f86906 | 130 | static int detect_vm_dmi(void) { |
2ef8a4c4 | 131 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
bdb628ee ZJS |
132 | |
133 | static const char *const dmi_vendors[] = { | |
3728dcde | 134 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
bdb628ee ZJS |
135 | "/sys/class/dmi/id/sys_vendor", |
136 | "/sys/class/dmi/id/board_vendor", | |
137 | "/sys/class/dmi/id/bios_vendor" | |
138 | }; | |
139 | ||
75f86906 LP |
140 | static const struct { |
141 | const char *vendor; | |
142 | int id; | |
143 | } dmi_vendor_table[] = { | |
3728dcde | 144 | { "KVM", VIRTUALIZATION_KVM }, |
75f86906 | 145 | { "QEMU", VIRTUALIZATION_QEMU }, |
bdb628ee | 146 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
147 | { "VMware", VIRTUALIZATION_VMWARE }, |
148 | { "VMW", VIRTUALIZATION_VMWARE }, | |
149 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
150 | { "Xen", VIRTUALIZATION_XEN }, | |
151 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
152 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
aa0c3427 LBS |
153 | /* https://wiki.freebsd.org/bhyve */ |
154 | { "BHYVE", VIRTUALIZATION_BHYVE }, | |
75f86906 | 155 | }; |
bdb628ee | 156 | unsigned i; |
75f86906 | 157 | int r; |
b52aae1d LP |
158 | |
159 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 160 | _cleanup_free_ char *s = NULL; |
75f86906 | 161 | unsigned j; |
b52aae1d | 162 | |
b1b8e816 LP |
163 | r = read_one_line_file(dmi_vendors[i], &s); |
164 | if (r < 0) { | |
75f86906 LP |
165 | if (r == -ENOENT) |
166 | continue; | |
b52aae1d | 167 | |
75f86906 | 168 | return r; |
b52aae1d LP |
169 | } |
170 | ||
75f86906 | 171 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
9f63a08d SS |
172 | if (startswith(s, dmi_vendor_table[j].vendor)) { |
173 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
75f86906 | 174 | return dmi_vendor_table[j].id; |
9f63a08d | 175 | } |
b52aae1d | 176 | } |
bdb628ee ZJS |
177 | #endif |
178 | ||
9f63a08d SS |
179 | log_debug("No virtualization found in DMI"); |
180 | ||
75f86906 | 181 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
182 | } |
183 | ||
75f86906 | 184 | static int detect_vm_xen(void) { |
45e1c7d5 | 185 | |
3f61278b | 186 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
87dc723a OH |
187 | The presence of /proc/xen indicates some form of a Xen domain */ |
188 | if (access("/proc/xen", F_OK) < 0) { | |
189 | log_debug("Virtualization XEN not found, /proc/xen does not exist"); | |
3f61278b SS |
190 | return VIRTUALIZATION_NONE; |
191 | } | |
192 | ||
87dc723a | 193 | log_debug("Virtualization XEN found (/proc/xen exists)"); |
45e1c7d5 | 194 | return VIRTUALIZATION_XEN; |
3f61278b SS |
195 | } |
196 | ||
575e6588 OH |
197 | #define XENFEAT_dom0 11 /* xen/include/public/features.h */ |
198 | #define PATH_FEATURES "/sys/hypervisor/properties/features" | |
1a8e4148 OH |
199 | /* Returns -errno, or 0 for domU, or 1 for dom0 */ |
200 | static int detect_vm_xen_dom0(void) { | |
75f86906 LP |
201 | _cleanup_free_ char *domcap = NULL; |
202 | char *cap, *i; | |
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; | |
208 | if (r == 0) { | |
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 | |
75f86906 LP |
233 | i = domcap; |
234 | while ((cap = strsep(&i, ","))) | |
235 | if (streq(cap, "control_d")) | |
236 | break; | |
9f63a08d SS |
237 | if (!cap) { |
238 | log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)"); | |
1a8e4148 | 239 | return 0; |
9f63a08d SS |
240 | } |
241 | ||
242 | log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); | |
1a8e4148 | 243 | return 1; |
75f86906 | 244 | } |
37287585 | 245 | |
75f86906 LP |
246 | static int detect_vm_hypervisor(void) { |
247 | _cleanup_free_ char *hvtype = NULL; | |
248 | int r; | |
37287585 | 249 | |
75f86906 LP |
250 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
251 | if (r == -ENOENT) | |
252 | return VIRTUALIZATION_NONE; | |
253 | if (r < 0) | |
254 | return r; | |
37287585 | 255 | |
9f63a08d SS |
256 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
257 | ||
75f86906 LP |
258 | if (streq(hvtype, "xen")) |
259 | return VIRTUALIZATION_XEN; | |
260 | else | |
261 | return VIRTUALIZATION_VM_OTHER; | |
262 | } | |
37287585 | 263 | |
75f86906 LP |
264 | static int detect_vm_uml(void) { |
265 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
266 | int r; | |
37287585 | 267 | |
75f86906 LP |
268 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
269 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
ef2a48aa ZJS |
270 | if (r == -ENOENT) { |
271 | log_debug("/proc/cpuinfo not found, assuming no UML virtualization."); | |
272 | return VIRTUALIZATION_NONE; | |
273 | } | |
75f86906 | 274 | if (r < 0) |
bdb628ee | 275 | return r; |
9f63a08d SS |
276 | |
277 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) { | |
278 | log_debug("UML virtualization found in /proc/cpuinfo"); | |
75f86906 | 279 | return VIRTUALIZATION_UML; |
9f63a08d | 280 | } |
bdb628ee | 281 | |
ef2a48aa | 282 | log_debug("UML virtualization not found in /proc/cpuinfo."); |
75f86906 LP |
283 | return VIRTUALIZATION_NONE; |
284 | } | |
e32886e0 | 285 | |
75f86906 | 286 | static int detect_vm_zvm(void) { |
bdb628ee | 287 | |
75f86906 LP |
288 | #if defined(__s390__) |
289 | _cleanup_free_ char *t = NULL; | |
290 | int r; | |
e32886e0 | 291 | |
c4cd1d4d | 292 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
293 | if (r == -ENOENT) |
294 | return VIRTUALIZATION_NONE; | |
295 | if (r < 0) | |
296 | return r; | |
e32886e0 | 297 | |
9f63a08d | 298 | log_debug("Virtualization %s found in /proc/sysinfo", t); |
75f86906 LP |
299 | if (streq(t, "z/VM")) |
300 | return VIRTUALIZATION_ZVM; | |
301 | else | |
302 | return VIRTUALIZATION_KVM; | |
303 | #else | |
9f63a08d | 304 | log_debug("This platform does not support /proc/sysinfo"); |
75f86906 LP |
305 | return VIRTUALIZATION_NONE; |
306 | #endif | |
307 | } | |
e32886e0 | 308 | |
75f86906 LP |
309 | /* Returns a short identifier for the various VM implementations */ |
310 | int detect_vm(void) { | |
311 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
530c1c30 | 312 | bool other = false; |
c2b19b3c | 313 | int r, dmi; |
e32886e0 | 314 | |
75f86906 LP |
315 | if (cached_found >= 0) |
316 | return cached_found; | |
bdb628ee | 317 | |
f6875b0a | 318 | /* We have to use the correct order here: |
f6875b0a | 319 | * |
f2fe2865 LP |
320 | * → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft |
321 | * Hyper-V. | |
322 | * | |
323 | * → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is | |
324 | * overwritten. | |
325 | * | |
326 | * → Third, try to detect from DMI. */ | |
5f1c788c | 327 | |
28b1a3ea | 328 | dmi = detect_vm_dmi(); |
f2fe2865 | 329 | if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) { |
2f8e375d BR |
330 | r = dmi; |
331 | goto finish; | |
332 | } | |
5f1c788c | 333 | |
28b1a3ea | 334 | r = detect_vm_cpuid(); |
75f86906 LP |
335 | if (r < 0) |
336 | return r; | |
c2b19b3c LP |
337 | if (r == VIRTUALIZATION_VM_OTHER) |
338 | other = true; | |
339 | else if (r != VIRTUALIZATION_NONE) | |
340 | goto finish; | |
d831deb5 | 341 | |
c2b19b3c LP |
342 | /* Now, let's get back to DMI */ |
343 | if (dmi < 0) | |
344 | return dmi; | |
345 | if (dmi == VIRTUALIZATION_VM_OTHER) | |
346 | other = true; | |
347 | else if (dmi != VIRTUALIZATION_NONE) { | |
348 | r = dmi; | |
349 | goto finish; | |
530c1c30 | 350 | } |
b52aae1d | 351 | |
42685451 | 352 | /* x86 xen will most likely be detected by cpuid. If not (most likely |
87dc723a OH |
353 | * because we're not an x86 guest), then we should try the /proc/xen |
354 | * directory next. If that's not found, then we check for the high-level | |
355 | * hypervisor sysfs file. | |
2f5fa62b | 356 | */ |
42685451 AJ |
357 | |
358 | r = detect_vm_xen(); | |
7080ea16 RR |
359 | if (r < 0) |
360 | return r; | |
c2b19b3c LP |
361 | if (r == VIRTUALIZATION_VM_OTHER) |
362 | other = true; | |
363 | else if (r != VIRTUALIZATION_NONE) | |
364 | goto finish; | |
7080ea16 | 365 | |
75f86906 LP |
366 | r = detect_vm_hypervisor(); |
367 | if (r < 0) | |
368 | return r; | |
c2b19b3c LP |
369 | if (r == VIRTUALIZATION_VM_OTHER) |
370 | other = true; | |
371 | else if (r != VIRTUALIZATION_NONE) | |
372 | goto finish; | |
f41925b4 | 373 | |
75f86906 LP |
374 | r = detect_vm_device_tree(); |
375 | if (r < 0) | |
376 | return r; | |
c2b19b3c LP |
377 | if (r == VIRTUALIZATION_VM_OTHER) |
378 | other = true; | |
379 | else if (r != VIRTUALIZATION_NONE) | |
380 | goto finish; | |
f41925b4 | 381 | |
75f86906 LP |
382 | r = detect_vm_uml(); |
383 | if (r < 0) | |
384 | return r; | |
c2b19b3c LP |
385 | if (r == VIRTUALIZATION_VM_OTHER) |
386 | other = true; | |
387 | else if (r != VIRTUALIZATION_NONE) | |
388 | goto finish; | |
f41925b4 | 389 | |
75f86906 LP |
390 | r = detect_vm_zvm(); |
391 | if (r < 0) | |
392 | return r; | |
0fb533a5 LP |
393 | |
394 | finish: | |
3f61278b SS |
395 | /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
396 | * In order to detect the Dom0 as not virtualization we need to | |
397 | * double-check it */ | |
1a8e4148 | 398 | if (r == VIRTUALIZATION_XEN) { |
c2b19b3c LP |
399 | int dom0; |
400 | ||
401 | dom0 = detect_vm_xen_dom0(); | |
402 | if (dom0 < 0) | |
403 | return dom0; | |
404 | if (dom0 > 0) | |
1a8e4148 OH |
405 | r = VIRTUALIZATION_NONE; |
406 | } else if (r == VIRTUALIZATION_NONE && other) | |
530c1c30 | 407 | r = VIRTUALIZATION_VM_OTHER; |
3f61278b | 408 | |
0fb533a5 | 409 | cached_found = r; |
9f63a08d | 410 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
0fb533a5 | 411 | return r; |
b52aae1d LP |
412 | } |
413 | ||
75f86906 | 414 | int detect_container(void) { |
0fb533a5 | 415 | |
75f86906 LP |
416 | static const struct { |
417 | const char *value; | |
418 | int id; | |
419 | } value_table[] = { | |
420 | { "lxc", VIRTUALIZATION_LXC }, | |
421 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
422 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
423 | { "docker", VIRTUALIZATION_DOCKER }, | |
9fb16425 | 424 | { "rkt", VIRTUALIZATION_RKT }, |
75f86906 | 425 | }; |
0fb533a5 | 426 | |
75f86906 | 427 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 428 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
429 | const char *e = NULL; |
430 | unsigned j; | |
ab94af92 | 431 | int r; |
b52aae1d | 432 | |
75f86906 | 433 | if (cached_found >= 0) |
0fb533a5 | 434 | return cached_found; |
0fb533a5 | 435 | |
8d6e8034 | 436 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
b52aae1d LP |
437 | if (access("/proc/vz", F_OK) >= 0 && |
438 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 439 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 440 | goto finish; |
b52aae1d LP |
441 | } |
442 | ||
df0ff127 | 443 | if (getpid_cached() == 1) { |
8d6e8034 | 444 | /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */ |
fdd25311 LP |
445 | |
446 | e = getenv("container"); | |
447 | if (isempty(e)) { | |
75f86906 | 448 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
449 | goto finish; |
450 | } | |
fdd25311 | 451 | |
8d6e8034 LP |
452 | goto translate_name; |
453 | } | |
454 | ||
455 | /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing | |
456 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */ | |
457 | r = read_one_line_file("/run/systemd/container", &m); | |
458 | if (r >= 0) { | |
459 | e = m; | |
460 | goto translate_name; | |
461 | } | |
462 | if (r != -ENOENT) | |
463 | return log_debug_errno(r, "Failed to read /run/systemd/container: %m"); | |
464 | ||
465 | /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */ | |
466 | r = getenv_for_pid(1, "container", &m); | |
467 | if (r > 0) { | |
fdd25311 | 468 | e = m; |
8d6e8034 | 469 | goto translate_name; |
fdd25311 | 470 | } |
8d6e8034 LP |
471 | if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */ |
472 | log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m"); | |
473 | ||
474 | /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown | |
475 | * there is not 1, we know we are in a PID namespace. and hence a container. */ | |
476 | r = read_one_line_file("/proc/1/sched", &m); | |
477 | if (r >= 0) { | |
478 | const char *t; | |
479 | ||
480 | t = strrchr(m, '('); | |
481 | if (!t) | |
482 | return -EIO; | |
483 | ||
484 | if (!startswith(t, "(1,")) { | |
485 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
486 | goto finish; | |
487 | } | |
488 | } else if (r != -ENOENT) | |
489 | return r; | |
490 | ||
491 | /* If that didn't work, give up, assume no container manager. */ | |
492 | r = VIRTUALIZATION_NONE; | |
493 | goto finish; | |
b52aae1d | 494 | |
8d6e8034 | 495 | translate_name: |
75f86906 LP |
496 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
497 | if (streq(e, value_table[j].value)) { | |
498 | r = value_table[j].id; | |
499 | goto finish; | |
500 | } | |
0fb533a5 | 501 | |
f499daf4 | 502 | r = VIRTUALIZATION_CONTAINER_OTHER; |
fdd25311 | 503 | |
0fb533a5 | 504 | finish: |
8d6e8034 | 505 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
0fb533a5 | 506 | cached_found = r; |
ab94af92 | 507 | return r; |
b52aae1d LP |
508 | } |
509 | ||
75f86906 | 510 | int detect_virtualization(void) { |
b52aae1d | 511 | int r; |
b52aae1d | 512 | |
75f86906 | 513 | r = detect_container(); |
9f63a08d SS |
514 | if (r == 0) |
515 | r = detect_vm(); | |
b52aae1d | 516 | |
9f63a08d | 517 | return r; |
b52aae1d | 518 | } |
75f86906 | 519 | |
299a34c1 ZJS |
520 | static int userns_has_mapping(const char *name) { |
521 | _cleanup_fclose_ FILE *f = NULL; | |
522 | _cleanup_free_ char *buf = NULL; | |
523 | size_t n_allocated = 0; | |
524 | ssize_t n; | |
525 | uint32_t a, b, c; | |
526 | int r; | |
527 | ||
528 | f = fopen(name, "re"); | |
529 | if (!f) { | |
530 | log_debug_errno(errno, "Failed to open %s: %m", name); | |
abd67ce7 | 531 | return errno == ENOENT ? false : -errno; |
299a34c1 ZJS |
532 | } |
533 | ||
534 | n = getline(&buf, &n_allocated, f); | |
535 | if (n < 0) { | |
536 | if (feof(f)) { | |
537 | log_debug("%s is empty, we're in an uninitialized user namespace", name); | |
538 | return true; | |
539 | } | |
540 | ||
541 | return log_debug_errno(errno, "Failed to read %s: %m", name); | |
542 | } | |
543 | ||
544 | r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); | |
545 | if (r < 3) | |
546 | return log_debug_errno(errno, "Failed to parse %s: %m", name); | |
547 | ||
548 | if (a == 0 && b == 0 && c == UINT32_MAX) { | |
549 | /* The kernel calls mappings_overlap() and does not allow overlaps */ | |
550 | log_debug("%s has a full 1:1 mapping", name); | |
551 | return false; | |
552 | } | |
553 | ||
554 | /* Anything else implies that we are in a user namespace */ | |
555 | log_debug("Mapping found in %s, we're in a user namespace", name); | |
556 | return true; | |
557 | } | |
558 | ||
559 | int running_in_userns(void) { | |
560 | _cleanup_free_ char *line = NULL; | |
561 | int r; | |
562 | ||
563 | r = userns_has_mapping("/proc/self/uid_map"); | |
564 | if (r != 0) | |
565 | return r; | |
566 | ||
567 | r = userns_has_mapping("/proc/self/gid_map"); | |
568 | if (r != 0) | |
569 | return r; | |
570 | ||
571 | /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also | |
572 | * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" | |
573 | * also does not exist. We cannot distinguish those two cases, so assume that | |
574 | * we're running on a stripped-down recent kernel, rather than on an old one, | |
575 | * and if the file is not found, return false. | |
576 | */ | |
577 | r = read_one_line_file("/proc/self/setgroups", &line); | |
578 | if (r < 0) { | |
579 | log_debug_errno(r, "/proc/self/setgroups: %m"); | |
580 | return r == -ENOENT ? false : r; | |
581 | } | |
582 | ||
583 | truncate_nl(line); | |
584 | r = streq(line, "deny"); | |
585 | /* See user_namespaces(7) for a description of this "setgroups" contents. */ | |
586 | log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); | |
587 | return r; | |
588 | } | |
589 | ||
7f4b3c5e | 590 | int running_in_chroot(void) { |
ef2a48aa | 591 | int r; |
7f4b3c5e | 592 | |
08a28eec LN |
593 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
594 | return 0; | |
595 | ||
ef2a48aa ZJS |
596 | r = files_same("/proc/1/root", "/", 0); |
597 | if (r < 0) | |
598 | return r; | |
7f4b3c5e | 599 | |
ef2a48aa | 600 | return r == 0; |
7f4b3c5e LP |
601 | } |
602 | ||
75f86906 LP |
603 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
604 | [VIRTUALIZATION_NONE] = "none", | |
605 | [VIRTUALIZATION_KVM] = "kvm", | |
606 | [VIRTUALIZATION_QEMU] = "qemu", | |
607 | [VIRTUALIZATION_BOCHS] = "bochs", | |
608 | [VIRTUALIZATION_XEN] = "xen", | |
609 | [VIRTUALIZATION_UML] = "uml", | |
610 | [VIRTUALIZATION_VMWARE] = "vmware", | |
611 | [VIRTUALIZATION_ORACLE] = "oracle", | |
612 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
613 | [VIRTUALIZATION_ZVM] = "zvm", | |
614 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
aa0c3427 | 615 | [VIRTUALIZATION_BHYVE] = "bhyve", |
1fdf07f5 | 616 | [VIRTUALIZATION_QNX] = "qnx", |
75f86906 LP |
617 | [VIRTUALIZATION_VM_OTHER] = "vm-other", |
618 | ||
619 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
620 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
621 | [VIRTUALIZATION_LXC] = "lxc", | |
622 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
623 | [VIRTUALIZATION_DOCKER] = "docker", | |
9fb16425 | 624 | [VIRTUALIZATION_RKT] = "rkt", |
75f86906 LP |
625 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
626 | }; | |
627 | ||
628 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |