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Commit | Line | Data |
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b52aae1d LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2011 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
7 | under the terms of the GNU Lesser General Public License as published by |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
b52aae1d LP |
9 | (at your option) any later version. |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 14 | Lesser General Public License for more details. |
b52aae1d | 15 | |
5430f7f2 | 16 | You should have received a copy of the GNU Lesser General Public License |
b52aae1d LP |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
18 | ***/ | |
19 | ||
b52aae1d | 20 | #include <errno.h> |
11c3a366 TA |
21 | #include <stdint.h> |
22 | #include <stdlib.h> | |
07630cea | 23 | #include <string.h> |
b52aae1d LP |
24 | #include <unistd.h> |
25 | ||
b5efdb8a | 26 | #include "alloc-util.h" |
ade61d3b | 27 | #include "dirent-util.h" |
295ee984 | 28 | #include "env-util.h" |
ade61d3b | 29 | #include "fd-util.h" |
07630cea | 30 | #include "fileio.h" |
11c3a366 | 31 | #include "macro.h" |
93cc7779 | 32 | #include "process-util.h" |
b5efdb8a | 33 | #include "stat-util.h" |
8b43440b | 34 | #include "string-table.h" |
07630cea | 35 | #include "string-util.h" |
b52aae1d LP |
36 | #include "virt.h" |
37 | ||
75f86906 | 38 | static int detect_vm_cpuid(void) { |
b52aae1d | 39 | |
2ef8a4c4 | 40 | /* CPUID is an x86 specific interface. */ |
bdb628ee | 41 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 42 | |
75f86906 LP |
43 | static const struct { |
44 | const char *cpuid; | |
45 | int id; | |
46 | } cpuid_vendor_table[] = { | |
47 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
48 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
b52aae1d | 49 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 50 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
ff85f271 | 51 | /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ |
75f86906 | 52 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
aa0c3427 LBS |
53 | /* https://wiki.freebsd.org/bhyve */ |
54 | { "bhyve bhyve ", VIRTUALIZATION_BHYVE }, | |
75f86906 | 55 | }; |
b52aae1d LP |
56 | |
57 | uint32_t eax, ecx; | |
b52aae1d LP |
58 | bool hypervisor; |
59 | ||
60 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d LP |
61 | |
62 | #if defined (__i386__) | |
63 | #define REG_a "eax" | |
64 | #define REG_b "ebx" | |
65 | #elif defined (__amd64__) | |
66 | #define REG_a "rax" | |
67 | #define REG_b "rbx" | |
68 | #endif | |
69 | ||
70 | /* First detect whether there is a hypervisor */ | |
71 | eax = 1; | |
72 | __asm__ __volatile__ ( | |
73 | /* ebx/rbx is being used for PIC! */ | |
74 | " push %%"REG_b" \n\t" | |
75 | " cpuid \n\t" | |
76 | " pop %%"REG_b" \n\t" | |
77 | ||
78 | : "=a" (eax), "=c" (ecx) | |
79 | : "0" (eax) | |
80 | ); | |
81 | ||
82 | hypervisor = !!(ecx & 0x80000000U); | |
83 | ||
84 | if (hypervisor) { | |
75f86906 LP |
85 | union { |
86 | uint32_t sig32[3]; | |
87 | char text[13]; | |
88 | } sig = {}; | |
89 | unsigned j; | |
b52aae1d LP |
90 | |
91 | /* There is a hypervisor, see what it is */ | |
92 | eax = 0x40000000U; | |
93 | __asm__ __volatile__ ( | |
94 | /* ebx/rbx is being used for PIC! */ | |
95 | " push %%"REG_b" \n\t" | |
96 | " cpuid \n\t" | |
97 | " mov %%ebx, %1 \n\t" | |
98 | " pop %%"REG_b" \n\t" | |
99 | ||
100 | : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2]) | |
101 | : "0" (eax) | |
102 | ); | |
103 | ||
9f63a08d SS |
104 | log_debug("Virtualization found, CPUID=%s", sig.text); |
105 | ||
75f86906 LP |
106 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
107 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
108 | return cpuid_vendor_table[j].id; | |
bdb628ee | 109 | |
75f86906 | 110 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 111 | } |
bdb628ee | 112 | #endif |
9f63a08d | 113 | log_debug("No virtualization found in CPUID"); |
bdb628ee | 114 | |
75f86906 | 115 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
116 | } |
117 | ||
75f86906 | 118 | static int detect_vm_device_tree(void) { |
db6a8689 | 119 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
120 | _cleanup_free_ char *hvtype = NULL; |
121 | int r; | |
122 | ||
b8f1df82 | 123 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 124 | if (r == -ENOENT) { |
ce09c71d AJ |
125 | _cleanup_closedir_ DIR *dir = NULL; |
126 | struct dirent *dent; | |
127 | ||
128 | dir = opendir("/proc/device-tree"); | |
129 | if (!dir) { | |
9f63a08d SS |
130 | if (errno == ENOENT) { |
131 | log_debug_errno(errno, "/proc/device-tree: %m"); | |
75f86906 | 132 | return VIRTUALIZATION_NONE; |
9f63a08d | 133 | } |
ce09c71d AJ |
134 | return -errno; |
135 | } | |
136 | ||
75f86906 | 137 | FOREACH_DIRENT(dent, dir, return -errno) |
9f63a08d SS |
138 | if (strstr(dent->d_name, "fw-cfg")) { |
139 | log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); | |
75f86906 | 140 | return VIRTUALIZATION_QEMU; |
9f63a08d | 141 | } |
75f86906 | 142 | |
9f63a08d | 143 | log_debug("No virtualization found in /proc/device-tree/*"); |
75f86906 LP |
144 | return VIRTUALIZATION_NONE; |
145 | } else if (r < 0) | |
146 | return r; | |
147 | ||
9f63a08d | 148 | log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
75f86906 LP |
149 | if (streq(hvtype, "linux,kvm")) |
150 | return VIRTUALIZATION_KVM; | |
151 | else if (strstr(hvtype, "xen")) | |
152 | return VIRTUALIZATION_XEN; | |
153 | else | |
154 | return VIRTUALIZATION_VM_OTHER; | |
155 | #else | |
9f63a08d | 156 | log_debug("This platform does not support /proc/device-tree"); |
75f86906 | 157 | return VIRTUALIZATION_NONE; |
d831deb5 | 158 | #endif |
d831deb5 CA |
159 | } |
160 | ||
75f86906 | 161 | static int detect_vm_dmi(void) { |
2ef8a4c4 | 162 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
bdb628ee ZJS |
163 | |
164 | static const char *const dmi_vendors[] = { | |
3728dcde | 165 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
bdb628ee ZJS |
166 | "/sys/class/dmi/id/sys_vendor", |
167 | "/sys/class/dmi/id/board_vendor", | |
168 | "/sys/class/dmi/id/bios_vendor" | |
169 | }; | |
170 | ||
75f86906 LP |
171 | static const struct { |
172 | const char *vendor; | |
173 | int id; | |
174 | } dmi_vendor_table[] = { | |
3728dcde | 175 | { "KVM", VIRTUALIZATION_KVM }, |
75f86906 | 176 | { "QEMU", VIRTUALIZATION_QEMU }, |
bdb628ee | 177 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
178 | { "VMware", VIRTUALIZATION_VMWARE }, |
179 | { "VMW", VIRTUALIZATION_VMWARE }, | |
180 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
181 | { "Xen", VIRTUALIZATION_XEN }, | |
182 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
183 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
aa0c3427 LBS |
184 | /* https://wiki.freebsd.org/bhyve */ |
185 | { "BHYVE", VIRTUALIZATION_BHYVE }, | |
75f86906 | 186 | }; |
bdb628ee | 187 | unsigned i; |
75f86906 | 188 | int r; |
b52aae1d LP |
189 | |
190 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 191 | _cleanup_free_ char *s = NULL; |
75f86906 | 192 | unsigned j; |
b52aae1d | 193 | |
b1b8e816 LP |
194 | r = read_one_line_file(dmi_vendors[i], &s); |
195 | if (r < 0) { | |
75f86906 LP |
196 | if (r == -ENOENT) |
197 | continue; | |
b52aae1d | 198 | |
75f86906 | 199 | return r; |
b52aae1d LP |
200 | } |
201 | ||
9f63a08d SS |
202 | |
203 | ||
75f86906 | 204 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
9f63a08d SS |
205 | if (startswith(s, dmi_vendor_table[j].vendor)) { |
206 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
75f86906 | 207 | return dmi_vendor_table[j].id; |
9f63a08d | 208 | } |
b52aae1d | 209 | } |
bdb628ee ZJS |
210 | #endif |
211 | ||
9f63a08d SS |
212 | log_debug("No virtualization found in DMI"); |
213 | ||
75f86906 | 214 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
215 | } |
216 | ||
75f86906 | 217 | static int detect_vm_xen(void) { |
3f61278b SS |
218 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
219 | Thats why we dont check the content of /proc/xen/capabilities here. */ | |
220 | if (access("/proc/xen/capabilities", F_OK) < 0) { | |
221 | log_debug("Virtualization XEN not found, /proc/xen/capabilities does not exist"); | |
222 | return VIRTUALIZATION_NONE; | |
223 | } | |
224 | ||
225 | log_debug("Virtualization XEN found (/proc/xen/capabilities exists)"); | |
226 | return VIRTUALIZATION_XEN; | |
227 | ||
228 | } | |
229 | ||
230 | static bool detect_vm_xen_dom0(void) { | |
75f86906 LP |
231 | _cleanup_free_ char *domcap = NULL; |
232 | char *cap, *i; | |
bdb628ee | 233 | int r; |
b52aae1d | 234 | |
75f86906 | 235 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
9f63a08d SS |
236 | if (r == -ENOENT) { |
237 | log_debug("Virtualization XEN not found, /proc/xen/capabilities does not exist"); | |
3f61278b | 238 | return false; |
9f63a08d | 239 | } |
d5b687e7 LP |
240 | if (r < 0) |
241 | return r; | |
bdb628ee | 242 | |
75f86906 LP |
243 | i = domcap; |
244 | while ((cap = strsep(&i, ","))) | |
245 | if (streq(cap, "control_d")) | |
246 | break; | |
9f63a08d SS |
247 | if (!cap) { |
248 | log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)"); | |
3f61278b | 249 | return false; |
9f63a08d SS |
250 | } |
251 | ||
252 | log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); | |
3f61278b | 253 | return true; |
75f86906 | 254 | } |
37287585 | 255 | |
75f86906 LP |
256 | static int detect_vm_hypervisor(void) { |
257 | _cleanup_free_ char *hvtype = NULL; | |
258 | int r; | |
37287585 | 259 | |
75f86906 LP |
260 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
261 | if (r == -ENOENT) | |
262 | return VIRTUALIZATION_NONE; | |
263 | if (r < 0) | |
264 | return r; | |
37287585 | 265 | |
9f63a08d SS |
266 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
267 | ||
75f86906 LP |
268 | if (streq(hvtype, "xen")) |
269 | return VIRTUALIZATION_XEN; | |
270 | else | |
271 | return VIRTUALIZATION_VM_OTHER; | |
272 | } | |
37287585 | 273 | |
75f86906 LP |
274 | static int detect_vm_uml(void) { |
275 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
276 | int r; | |
37287585 | 277 | |
75f86906 LP |
278 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
279 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
280 | if (r < 0) | |
bdb628ee | 281 | return r; |
9f63a08d SS |
282 | |
283 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) { | |
284 | log_debug("UML virtualization found in /proc/cpuinfo"); | |
75f86906 | 285 | return VIRTUALIZATION_UML; |
9f63a08d | 286 | } |
bdb628ee | 287 | |
82f8bae2 | 288 | log_debug("No virtualization found in /proc/cpuinfo."); |
75f86906 LP |
289 | return VIRTUALIZATION_NONE; |
290 | } | |
e32886e0 | 291 | |
75f86906 | 292 | static int detect_vm_zvm(void) { |
bdb628ee | 293 | |
75f86906 LP |
294 | #if defined(__s390__) |
295 | _cleanup_free_ char *t = NULL; | |
296 | int r; | |
e32886e0 | 297 | |
c4cd1d4d | 298 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
299 | if (r == -ENOENT) |
300 | return VIRTUALIZATION_NONE; | |
301 | if (r < 0) | |
302 | return r; | |
e32886e0 | 303 | |
9f63a08d | 304 | log_debug("Virtualization %s found in /proc/sysinfo", t); |
75f86906 LP |
305 | if (streq(t, "z/VM")) |
306 | return VIRTUALIZATION_ZVM; | |
307 | else | |
308 | return VIRTUALIZATION_KVM; | |
309 | #else | |
9f63a08d | 310 | log_debug("This platform does not support /proc/sysinfo"); |
75f86906 LP |
311 | return VIRTUALIZATION_NONE; |
312 | #endif | |
313 | } | |
e32886e0 | 314 | |
75f86906 LP |
315 | /* Returns a short identifier for the various VM implementations */ |
316 | int detect_vm(void) { | |
317 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
28b1a3ea | 318 | int r, dmi; |
e32886e0 | 319 | |
75f86906 LP |
320 | if (cached_found >= 0) |
321 | return cached_found; | |
bdb628ee | 322 | |
f6875b0a | 323 | /* We have to use the correct order here: |
f6875b0a | 324 | * |
28b1a3ea CH |
325 | * -> First try to detect Oracle Virtualbox, even if it uses KVM. |
326 | * -> Second try to detect from cpuid, this will report KVM for | |
327 | * whatever software is used even if info in dmi is overwritten. | |
328 | * -> Third try to detect from dmi. */ | |
5f1c788c | 329 | |
28b1a3ea | 330 | dmi = detect_vm_dmi(); |
2f8e375d BR |
331 | if (dmi == VIRTUALIZATION_ORACLE) { |
332 | r = dmi; | |
333 | goto finish; | |
334 | } | |
5f1c788c | 335 | |
28b1a3ea | 336 | r = detect_vm_cpuid(); |
75f86906 LP |
337 | if (r < 0) |
338 | return r; | |
339 | if (r != VIRTUALIZATION_NONE) | |
d831deb5 CA |
340 | goto finish; |
341 | ||
28b1a3ea | 342 | r = dmi; |
75f86906 LP |
343 | if (r < 0) |
344 | return r; | |
345 | if (r != VIRTUALIZATION_NONE) | |
0fb533a5 | 346 | goto finish; |
b52aae1d | 347 | |
42685451 AJ |
348 | /* x86 xen will most likely be detected by cpuid. If not (most likely |
349 | * because we're not an x86 guest), then we should try the xen capabilities | |
350 | * file next. If that's not found, then we check for the high-level | |
351 | * hypervisor sysfs file: | |
352 | * | |
353 | * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */ | |
354 | ||
355 | r = detect_vm_xen(); | |
7080ea16 RR |
356 | if (r < 0) |
357 | return r; | |
75f86906 | 358 | if (r != VIRTUALIZATION_NONE) |
0fb533a5 | 359 | goto finish; |
7080ea16 | 360 | |
75f86906 LP |
361 | r = detect_vm_hypervisor(); |
362 | if (r < 0) | |
363 | return r; | |
364 | if (r != VIRTUALIZATION_NONE) | |
365 | goto finish; | |
f41925b4 | 366 | |
75f86906 LP |
367 | r = detect_vm_device_tree(); |
368 | if (r < 0) | |
369 | return r; | |
370 | if (r != VIRTUALIZATION_NONE) | |
371 | goto finish; | |
f41925b4 | 372 | |
75f86906 LP |
373 | r = detect_vm_uml(); |
374 | if (r < 0) | |
375 | return r; | |
376 | if (r != VIRTUALIZATION_NONE) | |
377 | goto finish; | |
f41925b4 | 378 | |
75f86906 LP |
379 | r = detect_vm_zvm(); |
380 | if (r < 0) | |
381 | return r; | |
0fb533a5 LP |
382 | |
383 | finish: | |
3f61278b SS |
384 | /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
385 | * In order to detect the Dom0 as not virtualization we need to | |
386 | * double-check it */ | |
387 | if (r == VIRTUALIZATION_XEN && detect_vm_xen_dom0()) | |
388 | r = VIRTUALIZATION_NONE; | |
389 | ||
0fb533a5 | 390 | cached_found = r; |
9f63a08d | 391 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
0fb533a5 | 392 | return r; |
b52aae1d LP |
393 | } |
394 | ||
75f86906 | 395 | int detect_container(void) { |
0fb533a5 | 396 | |
75f86906 LP |
397 | static const struct { |
398 | const char *value; | |
399 | int id; | |
400 | } value_table[] = { | |
401 | { "lxc", VIRTUALIZATION_LXC }, | |
402 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
403 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
404 | { "docker", VIRTUALIZATION_DOCKER }, | |
9fb16425 | 405 | { "rkt", VIRTUALIZATION_RKT }, |
75f86906 | 406 | }; |
0fb533a5 | 407 | |
75f86906 | 408 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 409 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
410 | const char *e = NULL; |
411 | unsigned j; | |
ab94af92 | 412 | int r; |
b52aae1d | 413 | |
75f86906 | 414 | if (cached_found >= 0) |
0fb533a5 | 415 | return cached_found; |
0fb533a5 | 416 | |
8d6e8034 | 417 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
b52aae1d LP |
418 | if (access("/proc/vz", F_OK) >= 0 && |
419 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 420 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 421 | goto finish; |
b52aae1d LP |
422 | } |
423 | ||
fdd25311 | 424 | if (getpid() == 1) { |
8d6e8034 | 425 | /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */ |
fdd25311 LP |
426 | |
427 | e = getenv("container"); | |
428 | if (isempty(e)) { | |
75f86906 | 429 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
430 | goto finish; |
431 | } | |
fdd25311 | 432 | |
8d6e8034 LP |
433 | goto translate_name; |
434 | } | |
435 | ||
436 | /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing | |
437 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */ | |
438 | r = read_one_line_file("/run/systemd/container", &m); | |
439 | if (r >= 0) { | |
440 | e = m; | |
441 | goto translate_name; | |
442 | } | |
443 | if (r != -ENOENT) | |
444 | return log_debug_errno(r, "Failed to read /run/systemd/container: %m"); | |
445 | ||
446 | /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */ | |
447 | r = getenv_for_pid(1, "container", &m); | |
448 | if (r > 0) { | |
fdd25311 | 449 | e = m; |
8d6e8034 | 450 | goto translate_name; |
fdd25311 | 451 | } |
8d6e8034 LP |
452 | if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */ |
453 | log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m"); | |
454 | ||
455 | /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown | |
456 | * there is not 1, we know we are in a PID namespace. and hence a container. */ | |
457 | r = read_one_line_file("/proc/1/sched", &m); | |
458 | if (r >= 0) { | |
459 | const char *t; | |
460 | ||
461 | t = strrchr(m, '('); | |
462 | if (!t) | |
463 | return -EIO; | |
464 | ||
465 | if (!startswith(t, "(1,")) { | |
466 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
467 | goto finish; | |
468 | } | |
469 | } else if (r != -ENOENT) | |
470 | return r; | |
471 | ||
472 | /* If that didn't work, give up, assume no container manager. */ | |
473 | r = VIRTUALIZATION_NONE; | |
474 | goto finish; | |
b52aae1d | 475 | |
8d6e8034 | 476 | translate_name: |
75f86906 LP |
477 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
478 | if (streq(e, value_table[j].value)) { | |
479 | r = value_table[j].id; | |
480 | goto finish; | |
481 | } | |
0fb533a5 | 482 | |
f499daf4 | 483 | r = VIRTUALIZATION_CONTAINER_OTHER; |
fdd25311 | 484 | |
0fb533a5 | 485 | finish: |
8d6e8034 | 486 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
0fb533a5 | 487 | cached_found = r; |
ab94af92 | 488 | return r; |
b52aae1d LP |
489 | } |
490 | ||
75f86906 | 491 | int detect_virtualization(void) { |
b52aae1d | 492 | int r; |
b52aae1d | 493 | |
75f86906 | 494 | r = detect_container(); |
9f63a08d SS |
495 | if (r == 0) |
496 | r = detect_vm(); | |
b52aae1d | 497 | |
9f63a08d | 498 | return r; |
b52aae1d | 499 | } |
75f86906 | 500 | |
299a34c1 ZJS |
501 | static int userns_has_mapping(const char *name) { |
502 | _cleanup_fclose_ FILE *f = NULL; | |
503 | _cleanup_free_ char *buf = NULL; | |
504 | size_t n_allocated = 0; | |
505 | ssize_t n; | |
506 | uint32_t a, b, c; | |
507 | int r; | |
508 | ||
509 | f = fopen(name, "re"); | |
510 | if (!f) { | |
511 | log_debug_errno(errno, "Failed to open %s: %m", name); | |
abd67ce7 | 512 | return errno == ENOENT ? false : -errno; |
299a34c1 ZJS |
513 | } |
514 | ||
515 | n = getline(&buf, &n_allocated, f); | |
516 | if (n < 0) { | |
517 | if (feof(f)) { | |
518 | log_debug("%s is empty, we're in an uninitialized user namespace", name); | |
519 | return true; | |
520 | } | |
521 | ||
522 | return log_debug_errno(errno, "Failed to read %s: %m", name); | |
523 | } | |
524 | ||
525 | r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); | |
526 | if (r < 3) | |
527 | return log_debug_errno(errno, "Failed to parse %s: %m", name); | |
528 | ||
529 | if (a == 0 && b == 0 && c == UINT32_MAX) { | |
530 | /* The kernel calls mappings_overlap() and does not allow overlaps */ | |
531 | log_debug("%s has a full 1:1 mapping", name); | |
532 | return false; | |
533 | } | |
534 | ||
535 | /* Anything else implies that we are in a user namespace */ | |
536 | log_debug("Mapping found in %s, we're in a user namespace", name); | |
537 | return true; | |
538 | } | |
539 | ||
540 | int running_in_userns(void) { | |
541 | _cleanup_free_ char *line = NULL; | |
542 | int r; | |
543 | ||
544 | r = userns_has_mapping("/proc/self/uid_map"); | |
545 | if (r != 0) | |
546 | return r; | |
547 | ||
548 | r = userns_has_mapping("/proc/self/gid_map"); | |
549 | if (r != 0) | |
550 | return r; | |
551 | ||
552 | /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also | |
553 | * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" | |
554 | * also does not exist. We cannot distinguish those two cases, so assume that | |
555 | * we're running on a stripped-down recent kernel, rather than on an old one, | |
556 | * and if the file is not found, return false. | |
557 | */ | |
558 | r = read_one_line_file("/proc/self/setgroups", &line); | |
559 | if (r < 0) { | |
560 | log_debug_errno(r, "/proc/self/setgroups: %m"); | |
561 | return r == -ENOENT ? false : r; | |
562 | } | |
563 | ||
564 | truncate_nl(line); | |
565 | r = streq(line, "deny"); | |
566 | /* See user_namespaces(7) for a description of this "setgroups" contents. */ | |
567 | log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); | |
568 | return r; | |
569 | } | |
570 | ||
7f4b3c5e | 571 | int running_in_chroot(void) { |
d6d0473d | 572 | int ret; |
7f4b3c5e | 573 | |
08a28eec LN |
574 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
575 | return 0; | |
576 | ||
e3f791a2 | 577 | ret = files_same("/proc/1/root", "/", 0); |
d6d0473d LP |
578 | if (ret < 0) |
579 | return ret; | |
7f4b3c5e | 580 | |
d6d0473d | 581 | return ret == 0; |
7f4b3c5e LP |
582 | } |
583 | ||
75f86906 LP |
584 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
585 | [VIRTUALIZATION_NONE] = "none", | |
586 | [VIRTUALIZATION_KVM] = "kvm", | |
587 | [VIRTUALIZATION_QEMU] = "qemu", | |
588 | [VIRTUALIZATION_BOCHS] = "bochs", | |
589 | [VIRTUALIZATION_XEN] = "xen", | |
590 | [VIRTUALIZATION_UML] = "uml", | |
591 | [VIRTUALIZATION_VMWARE] = "vmware", | |
592 | [VIRTUALIZATION_ORACLE] = "oracle", | |
593 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
594 | [VIRTUALIZATION_ZVM] = "zvm", | |
595 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
aa0c3427 | 596 | [VIRTUALIZATION_BHYVE] = "bhyve", |
75f86906 LP |
597 | [VIRTUALIZATION_VM_OTHER] = "vm-other", |
598 | ||
599 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
600 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
601 | [VIRTUALIZATION_LXC] = "lxc", | |
602 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
603 | [VIRTUALIZATION_DOCKER] = "docker", | |
9fb16425 | 604 | [VIRTUALIZATION_RKT] = "rkt", |
75f86906 LP |
605 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
606 | }; | |
607 | ||
608 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |