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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" |
295ee984 | 31 | #include "fs-util.h" |
11c3a366 | 32 | #include "macro.h" |
93cc7779 | 33 | #include "process-util.h" |
b5efdb8a | 34 | #include "stat-util.h" |
8b43440b | 35 | #include "string-table.h" |
07630cea | 36 | #include "string-util.h" |
b52aae1d LP |
37 | #include "virt.h" |
38 | ||
75f86906 | 39 | static int detect_vm_cpuid(void) { |
b52aae1d | 40 | |
2ef8a4c4 | 41 | /* CPUID is an x86 specific interface. */ |
bdb628ee | 42 | #if defined(__i386__) || defined(__x86_64__) |
b52aae1d | 43 | |
75f86906 LP |
44 | static const struct { |
45 | const char *cpuid; | |
46 | int id; | |
47 | } cpuid_vendor_table[] = { | |
48 | { "XenVMMXenVMM", VIRTUALIZATION_XEN }, | |
49 | { "KVMKVMKVM", VIRTUALIZATION_KVM }, | |
b52aae1d | 50 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 | 51 | { "VMwareVMware", VIRTUALIZATION_VMWARE }, |
ff85f271 | 52 | /* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */ |
75f86906 | 53 | { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, |
aa0c3427 LBS |
54 | /* https://wiki.freebsd.org/bhyve */ |
55 | { "bhyve bhyve ", VIRTUALIZATION_BHYVE }, | |
75f86906 | 56 | }; |
b52aae1d LP |
57 | |
58 | uint32_t eax, ecx; | |
b52aae1d LP |
59 | bool hypervisor; |
60 | ||
61 | /* http://lwn.net/Articles/301888/ */ | |
b52aae1d LP |
62 | |
63 | #if defined (__i386__) | |
64 | #define REG_a "eax" | |
65 | #define REG_b "ebx" | |
66 | #elif defined (__amd64__) | |
67 | #define REG_a "rax" | |
68 | #define REG_b "rbx" | |
69 | #endif | |
70 | ||
71 | /* First detect whether there is a hypervisor */ | |
72 | eax = 1; | |
73 | __asm__ __volatile__ ( | |
74 | /* ebx/rbx is being used for PIC! */ | |
75 | " push %%"REG_b" \n\t" | |
76 | " cpuid \n\t" | |
77 | " pop %%"REG_b" \n\t" | |
78 | ||
79 | : "=a" (eax), "=c" (ecx) | |
80 | : "0" (eax) | |
81 | ); | |
82 | ||
83 | hypervisor = !!(ecx & 0x80000000U); | |
84 | ||
85 | if (hypervisor) { | |
75f86906 LP |
86 | union { |
87 | uint32_t sig32[3]; | |
88 | char text[13]; | |
89 | } sig = {}; | |
90 | unsigned j; | |
b52aae1d LP |
91 | |
92 | /* There is a hypervisor, see what it is */ | |
93 | eax = 0x40000000U; | |
94 | __asm__ __volatile__ ( | |
95 | /* ebx/rbx is being used for PIC! */ | |
96 | " push %%"REG_b" \n\t" | |
97 | " cpuid \n\t" | |
98 | " mov %%ebx, %1 \n\t" | |
99 | " pop %%"REG_b" \n\t" | |
100 | ||
101 | : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2]) | |
102 | : "0" (eax) | |
103 | ); | |
104 | ||
9f63a08d SS |
105 | log_debug("Virtualization found, CPUID=%s", sig.text); |
106 | ||
75f86906 LP |
107 | for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++) |
108 | if (streq(sig.text, cpuid_vendor_table[j].cpuid)) | |
109 | return cpuid_vendor_table[j].id; | |
bdb628ee | 110 | |
75f86906 | 111 | return VIRTUALIZATION_VM_OTHER; |
b52aae1d | 112 | } |
bdb628ee | 113 | #endif |
9f63a08d | 114 | log_debug("No virtualization found in CPUID"); |
bdb628ee | 115 | |
75f86906 | 116 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
117 | } |
118 | ||
75f86906 | 119 | static int detect_vm_device_tree(void) { |
db6a8689 | 120 | #if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__) |
d831deb5 CA |
121 | _cleanup_free_ char *hvtype = NULL; |
122 | int r; | |
123 | ||
b8f1df82 | 124 | r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype); |
75f86906 | 125 | if (r == -ENOENT) { |
ce09c71d AJ |
126 | _cleanup_closedir_ DIR *dir = NULL; |
127 | struct dirent *dent; | |
128 | ||
129 | dir = opendir("/proc/device-tree"); | |
130 | if (!dir) { | |
9f63a08d SS |
131 | if (errno == ENOENT) { |
132 | log_debug_errno(errno, "/proc/device-tree: %m"); | |
75f86906 | 133 | return VIRTUALIZATION_NONE; |
9f63a08d | 134 | } |
ce09c71d AJ |
135 | return -errno; |
136 | } | |
137 | ||
75f86906 | 138 | FOREACH_DIRENT(dent, dir, return -errno) |
9f63a08d SS |
139 | if (strstr(dent->d_name, "fw-cfg")) { |
140 | log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name); | |
75f86906 | 141 | return VIRTUALIZATION_QEMU; |
9f63a08d | 142 | } |
75f86906 | 143 | |
9f63a08d | 144 | log_debug("No virtualization found in /proc/device-tree/*"); |
75f86906 LP |
145 | return VIRTUALIZATION_NONE; |
146 | } else if (r < 0) | |
147 | return r; | |
148 | ||
9f63a08d | 149 | log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype); |
75f86906 LP |
150 | if (streq(hvtype, "linux,kvm")) |
151 | return VIRTUALIZATION_KVM; | |
152 | else if (strstr(hvtype, "xen")) | |
153 | return VIRTUALIZATION_XEN; | |
154 | else | |
155 | return VIRTUALIZATION_VM_OTHER; | |
156 | #else | |
9f63a08d | 157 | log_debug("This platform does not support /proc/device-tree"); |
75f86906 | 158 | return VIRTUALIZATION_NONE; |
d831deb5 | 159 | #endif |
d831deb5 CA |
160 | } |
161 | ||
75f86906 | 162 | static int detect_vm_dmi(void) { |
2ef8a4c4 | 163 | #if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__) |
bdb628ee ZJS |
164 | |
165 | static const char *const dmi_vendors[] = { | |
3728dcde | 166 | "/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */ |
bdb628ee ZJS |
167 | "/sys/class/dmi/id/sys_vendor", |
168 | "/sys/class/dmi/id/board_vendor", | |
169 | "/sys/class/dmi/id/bios_vendor" | |
170 | }; | |
171 | ||
75f86906 LP |
172 | static const struct { |
173 | const char *vendor; | |
174 | int id; | |
175 | } dmi_vendor_table[] = { | |
3728dcde | 176 | { "KVM", VIRTUALIZATION_KVM }, |
75f86906 | 177 | { "QEMU", VIRTUALIZATION_QEMU }, |
bdb628ee | 178 | /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */ |
75f86906 LP |
179 | { "VMware", VIRTUALIZATION_VMWARE }, |
180 | { "VMW", VIRTUALIZATION_VMWARE }, | |
181 | { "innotek GmbH", VIRTUALIZATION_ORACLE }, | |
182 | { "Xen", VIRTUALIZATION_XEN }, | |
183 | { "Bochs", VIRTUALIZATION_BOCHS }, | |
184 | { "Parallels", VIRTUALIZATION_PARALLELS }, | |
aa0c3427 LBS |
185 | /* https://wiki.freebsd.org/bhyve */ |
186 | { "BHYVE", VIRTUALIZATION_BHYVE }, | |
75f86906 | 187 | }; |
bdb628ee | 188 | unsigned i; |
75f86906 | 189 | int r; |
b52aae1d LP |
190 | |
191 | for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) { | |
b1b8e816 | 192 | _cleanup_free_ char *s = NULL; |
75f86906 | 193 | unsigned j; |
b52aae1d | 194 | |
b1b8e816 LP |
195 | r = read_one_line_file(dmi_vendors[i], &s); |
196 | if (r < 0) { | |
75f86906 LP |
197 | if (r == -ENOENT) |
198 | continue; | |
b52aae1d | 199 | |
75f86906 | 200 | return r; |
b52aae1d LP |
201 | } |
202 | ||
9f63a08d SS |
203 | |
204 | ||
75f86906 | 205 | for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++) |
9f63a08d SS |
206 | if (startswith(s, dmi_vendor_table[j].vendor)) { |
207 | log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]); | |
75f86906 | 208 | return dmi_vendor_table[j].id; |
9f63a08d | 209 | } |
b52aae1d | 210 | } |
bdb628ee ZJS |
211 | #endif |
212 | ||
9f63a08d SS |
213 | log_debug("No virtualization found in DMI"); |
214 | ||
75f86906 | 215 | return VIRTUALIZATION_NONE; |
bdb628ee ZJS |
216 | } |
217 | ||
75f86906 | 218 | static int detect_vm_xen(void) { |
3f61278b SS |
219 | /* Check for Dom0 will be executed later in detect_vm_xen_dom0 |
220 | Thats why we dont check the content of /proc/xen/capabilities here. */ | |
221 | if (access("/proc/xen/capabilities", F_OK) < 0) { | |
222 | log_debug("Virtualization XEN not found, /proc/xen/capabilities does not exist"); | |
223 | return VIRTUALIZATION_NONE; | |
224 | } | |
225 | ||
226 | log_debug("Virtualization XEN found (/proc/xen/capabilities exists)"); | |
227 | return VIRTUALIZATION_XEN; | |
228 | ||
229 | } | |
230 | ||
231 | static bool detect_vm_xen_dom0(void) { | |
75f86906 LP |
232 | _cleanup_free_ char *domcap = NULL; |
233 | char *cap, *i; | |
bdb628ee | 234 | int r; |
b52aae1d | 235 | |
75f86906 | 236 | r = read_one_line_file("/proc/xen/capabilities", &domcap); |
9f63a08d SS |
237 | if (r == -ENOENT) { |
238 | log_debug("Virtualization XEN not found, /proc/xen/capabilities does not exist"); | |
3f61278b | 239 | return false; |
9f63a08d | 240 | } |
d5b687e7 LP |
241 | if (r < 0) |
242 | return r; | |
bdb628ee | 243 | |
75f86906 LP |
244 | i = domcap; |
245 | while ((cap = strsep(&i, ","))) | |
246 | if (streq(cap, "control_d")) | |
247 | break; | |
9f63a08d SS |
248 | if (!cap) { |
249 | log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)"); | |
3f61278b | 250 | return false; |
9f63a08d SS |
251 | } |
252 | ||
253 | log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)"); | |
3f61278b | 254 | return true; |
75f86906 | 255 | } |
37287585 | 256 | |
75f86906 LP |
257 | static int detect_vm_hypervisor(void) { |
258 | _cleanup_free_ char *hvtype = NULL; | |
259 | int r; | |
37287585 | 260 | |
75f86906 LP |
261 | r = read_one_line_file("/sys/hypervisor/type", &hvtype); |
262 | if (r == -ENOENT) | |
263 | return VIRTUALIZATION_NONE; | |
264 | if (r < 0) | |
265 | return r; | |
37287585 | 266 | |
9f63a08d SS |
267 | log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype); |
268 | ||
75f86906 LP |
269 | if (streq(hvtype, "xen")) |
270 | return VIRTUALIZATION_XEN; | |
271 | else | |
272 | return VIRTUALIZATION_VM_OTHER; | |
273 | } | |
37287585 | 274 | |
75f86906 LP |
275 | static int detect_vm_uml(void) { |
276 | _cleanup_free_ char *cpuinfo_contents = NULL; | |
277 | int r; | |
37287585 | 278 | |
75f86906 LP |
279 | /* Detect User-Mode Linux by reading /proc/cpuinfo */ |
280 | r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL); | |
281 | if (r < 0) | |
bdb628ee | 282 | return r; |
9f63a08d SS |
283 | |
284 | if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) { | |
285 | log_debug("UML virtualization found in /proc/cpuinfo"); | |
75f86906 | 286 | return VIRTUALIZATION_UML; |
9f63a08d | 287 | } |
bdb628ee | 288 | |
82f8bae2 | 289 | log_debug("No virtualization found in /proc/cpuinfo."); |
75f86906 LP |
290 | return VIRTUALIZATION_NONE; |
291 | } | |
e32886e0 | 292 | |
75f86906 | 293 | static int detect_vm_zvm(void) { |
bdb628ee | 294 | |
75f86906 LP |
295 | #if defined(__s390__) |
296 | _cleanup_free_ char *t = NULL; | |
297 | int r; | |
e32886e0 | 298 | |
c4cd1d4d | 299 | r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t); |
75f86906 LP |
300 | if (r == -ENOENT) |
301 | return VIRTUALIZATION_NONE; | |
302 | if (r < 0) | |
303 | return r; | |
e32886e0 | 304 | |
9f63a08d | 305 | log_debug("Virtualization %s found in /proc/sysinfo", t); |
75f86906 LP |
306 | if (streq(t, "z/VM")) |
307 | return VIRTUALIZATION_ZVM; | |
308 | else | |
309 | return VIRTUALIZATION_KVM; | |
310 | #else | |
9f63a08d | 311 | log_debug("This platform does not support /proc/sysinfo"); |
75f86906 LP |
312 | return VIRTUALIZATION_NONE; |
313 | #endif | |
314 | } | |
e32886e0 | 315 | |
75f86906 LP |
316 | /* Returns a short identifier for the various VM implementations */ |
317 | int detect_vm(void) { | |
318 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; | |
5f1c788c | 319 | int r, cpuid; |
e32886e0 | 320 | |
75f86906 LP |
321 | if (cached_found >= 0) |
322 | return cached_found; | |
bdb628ee | 323 | |
f6875b0a | 324 | /* We have to use the correct order here: |
f6875b0a | 325 | * |
5f1c788c CH |
326 | * -> First try to detect qemu/kvm and return 'kvm'. |
327 | * -> Some virtualization technologies do use KVM hypervisor but are | |
328 | * expected to be detected as something else. Virtualbox since | |
329 | * version 5.0 is an example. So detect DMI next. | |
330 | * -> Get infos from CPUID third. */ | |
331 | ||
332 | cpuid = detect_vm_cpuid(); | |
050e65ad | 333 | r = detect_vm_dmi(); |
5f1c788c CH |
334 | |
335 | if (r == VIRTUALIZATION_QEMU && cpuid == VIRTUALIZATION_KVM) | |
336 | return cpuid; | |
337 | ||
75f86906 LP |
338 | if (r < 0) |
339 | return r; | |
340 | if (r != VIRTUALIZATION_NONE) | |
d831deb5 CA |
341 | goto finish; |
342 | ||
5f1c788c | 343 | r = cpuid; |
75f86906 LP |
344 | if (r < 0) |
345 | return r; | |
346 | if (r != VIRTUALIZATION_NONE) | |
0fb533a5 | 347 | goto finish; |
b52aae1d | 348 | |
42685451 AJ |
349 | /* x86 xen will most likely be detected by cpuid. If not (most likely |
350 | * because we're not an x86 guest), then we should try the xen capabilities | |
351 | * file next. If that's not found, then we check for the high-level | |
352 | * hypervisor sysfs file: | |
353 | * | |
354 | * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */ | |
355 | ||
356 | r = detect_vm_xen(); | |
7080ea16 RR |
357 | if (r < 0) |
358 | return r; | |
75f86906 | 359 | if (r != VIRTUALIZATION_NONE) |
0fb533a5 | 360 | goto finish; |
7080ea16 | 361 | |
75f86906 LP |
362 | r = detect_vm_hypervisor(); |
363 | if (r < 0) | |
364 | return r; | |
365 | if (r != VIRTUALIZATION_NONE) | |
366 | goto finish; | |
f41925b4 | 367 | |
75f86906 LP |
368 | r = detect_vm_device_tree(); |
369 | if (r < 0) | |
370 | return r; | |
371 | if (r != VIRTUALIZATION_NONE) | |
372 | goto finish; | |
f41925b4 | 373 | |
75f86906 LP |
374 | r = detect_vm_uml(); |
375 | if (r < 0) | |
376 | return r; | |
377 | if (r != VIRTUALIZATION_NONE) | |
378 | goto finish; | |
f41925b4 | 379 | |
75f86906 LP |
380 | r = detect_vm_zvm(); |
381 | if (r < 0) | |
382 | return r; | |
0fb533a5 LP |
383 | |
384 | finish: | |
3f61278b SS |
385 | /* x86 xen Dom0 is detected as XEN in hypervisor and maybe others. |
386 | * In order to detect the Dom0 as not virtualization we need to | |
387 | * double-check it */ | |
388 | if (r == VIRTUALIZATION_XEN && detect_vm_xen_dom0()) | |
389 | r = VIRTUALIZATION_NONE; | |
390 | ||
0fb533a5 | 391 | cached_found = r; |
9f63a08d | 392 | log_debug("Found VM virtualization %s", virtualization_to_string(r)); |
0fb533a5 | 393 | return r; |
b52aae1d LP |
394 | } |
395 | ||
75f86906 | 396 | int detect_container(void) { |
0fb533a5 | 397 | |
75f86906 LP |
398 | static const struct { |
399 | const char *value; | |
400 | int id; | |
401 | } value_table[] = { | |
402 | { "lxc", VIRTUALIZATION_LXC }, | |
403 | { "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT }, | |
404 | { "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN }, | |
405 | { "docker", VIRTUALIZATION_DOCKER }, | |
9fb16425 | 406 | { "rkt", VIRTUALIZATION_RKT }, |
75f86906 | 407 | }; |
0fb533a5 | 408 | |
75f86906 | 409 | static thread_local int cached_found = _VIRTUALIZATION_INVALID; |
fdd25311 | 410 | _cleanup_free_ char *m = NULL; |
75f86906 LP |
411 | const char *e = NULL; |
412 | unsigned j; | |
ab94af92 | 413 | int r; |
b52aae1d | 414 | |
75f86906 | 415 | if (cached_found >= 0) |
0fb533a5 | 416 | return cached_found; |
0fb533a5 | 417 | |
8d6e8034 | 418 | /* /proc/vz exists in container and outside of the container, /proc/bc only outside of the container. */ |
b52aae1d LP |
419 | if (access("/proc/vz", F_OK) >= 0 && |
420 | access("/proc/bc", F_OK) < 0) { | |
75f86906 | 421 | r = VIRTUALIZATION_OPENVZ; |
0fb533a5 | 422 | goto finish; |
b52aae1d LP |
423 | } |
424 | ||
fdd25311 | 425 | if (getpid() == 1) { |
8d6e8034 | 426 | /* If we are PID 1 we can just check our own environment variable, and that's authoritative. */ |
fdd25311 LP |
427 | |
428 | e = getenv("container"); | |
429 | if (isempty(e)) { | |
75f86906 | 430 | r = VIRTUALIZATION_NONE; |
fdd25311 LP |
431 | goto finish; |
432 | } | |
fdd25311 | 433 | |
8d6e8034 LP |
434 | goto translate_name; |
435 | } | |
436 | ||
437 | /* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing | |
438 | * /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */ | |
439 | r = read_one_line_file("/run/systemd/container", &m); | |
440 | if (r >= 0) { | |
441 | e = m; | |
442 | goto translate_name; | |
443 | } | |
444 | if (r != -ENOENT) | |
445 | return log_debug_errno(r, "Failed to read /run/systemd/container: %m"); | |
446 | ||
447 | /* Fallback for cases where PID 1 was not systemd (for example, cases where init=/bin/sh is used. */ | |
448 | r = getenv_for_pid(1, "container", &m); | |
449 | if (r > 0) { | |
fdd25311 | 450 | e = m; |
8d6e8034 | 451 | goto translate_name; |
fdd25311 | 452 | } |
8d6e8034 LP |
453 | if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */ |
454 | log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m"); | |
455 | ||
456 | /* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown | |
457 | * there is not 1, we know we are in a PID namespace. and hence a container. */ | |
458 | r = read_one_line_file("/proc/1/sched", &m); | |
459 | if (r >= 0) { | |
460 | const char *t; | |
461 | ||
462 | t = strrchr(m, '('); | |
463 | if (!t) | |
464 | return -EIO; | |
465 | ||
466 | if (!startswith(t, "(1,")) { | |
467 | r = VIRTUALIZATION_CONTAINER_OTHER; | |
468 | goto finish; | |
469 | } | |
470 | } else if (r != -ENOENT) | |
471 | return r; | |
472 | ||
473 | /* If that didn't work, give up, assume no container manager. */ | |
474 | r = VIRTUALIZATION_NONE; | |
475 | goto finish; | |
b52aae1d | 476 | |
8d6e8034 | 477 | translate_name: |
75f86906 LP |
478 | for (j = 0; j < ELEMENTSOF(value_table); j++) |
479 | if (streq(e, value_table[j].value)) { | |
480 | r = value_table[j].id; | |
481 | goto finish; | |
482 | } | |
0fb533a5 | 483 | |
f499daf4 | 484 | r = VIRTUALIZATION_CONTAINER_OTHER; |
fdd25311 | 485 | |
0fb533a5 | 486 | finish: |
8d6e8034 | 487 | log_debug("Found container virtualization %s.", virtualization_to_string(r)); |
0fb533a5 | 488 | cached_found = r; |
ab94af92 | 489 | return r; |
b52aae1d LP |
490 | } |
491 | ||
75f86906 | 492 | int detect_virtualization(void) { |
b52aae1d | 493 | int r; |
b52aae1d | 494 | |
75f86906 | 495 | r = detect_container(); |
9f63a08d SS |
496 | if (r == 0) |
497 | r = detect_vm(); | |
b52aae1d | 498 | |
9f63a08d | 499 | return r; |
b52aae1d | 500 | } |
75f86906 | 501 | |
299a34c1 ZJS |
502 | static int userns_has_mapping(const char *name) { |
503 | _cleanup_fclose_ FILE *f = NULL; | |
504 | _cleanup_free_ char *buf = NULL; | |
505 | size_t n_allocated = 0; | |
506 | ssize_t n; | |
507 | uint32_t a, b, c; | |
508 | int r; | |
509 | ||
510 | f = fopen(name, "re"); | |
511 | if (!f) { | |
512 | log_debug_errno(errno, "Failed to open %s: %m", name); | |
abd67ce7 | 513 | return errno == ENOENT ? false : -errno; |
299a34c1 ZJS |
514 | } |
515 | ||
516 | n = getline(&buf, &n_allocated, f); | |
517 | if (n < 0) { | |
518 | if (feof(f)) { | |
519 | log_debug("%s is empty, we're in an uninitialized user namespace", name); | |
520 | return true; | |
521 | } | |
522 | ||
523 | return log_debug_errno(errno, "Failed to read %s: %m", name); | |
524 | } | |
525 | ||
526 | r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); | |
527 | if (r < 3) | |
528 | return log_debug_errno(errno, "Failed to parse %s: %m", name); | |
529 | ||
530 | if (a == 0 && b == 0 && c == UINT32_MAX) { | |
531 | /* The kernel calls mappings_overlap() and does not allow overlaps */ | |
532 | log_debug("%s has a full 1:1 mapping", name); | |
533 | return false; | |
534 | } | |
535 | ||
536 | /* Anything else implies that we are in a user namespace */ | |
537 | log_debug("Mapping found in %s, we're in a user namespace", name); | |
538 | return true; | |
539 | } | |
540 | ||
541 | int running_in_userns(void) { | |
542 | _cleanup_free_ char *line = NULL; | |
543 | int r; | |
544 | ||
545 | r = userns_has_mapping("/proc/self/uid_map"); | |
546 | if (r != 0) | |
547 | return r; | |
548 | ||
549 | r = userns_has_mapping("/proc/self/gid_map"); | |
550 | if (r != 0) | |
551 | return r; | |
552 | ||
553 | /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also | |
554 | * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" | |
555 | * also does not exist. We cannot distinguish those two cases, so assume that | |
556 | * we're running on a stripped-down recent kernel, rather than on an old one, | |
557 | * and if the file is not found, return false. | |
558 | */ | |
559 | r = read_one_line_file("/proc/self/setgroups", &line); | |
560 | if (r < 0) { | |
561 | log_debug_errno(r, "/proc/self/setgroups: %m"); | |
562 | return r == -ENOENT ? false : r; | |
563 | } | |
564 | ||
565 | truncate_nl(line); | |
566 | r = streq(line, "deny"); | |
567 | /* See user_namespaces(7) for a description of this "setgroups" contents. */ | |
568 | log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); | |
569 | return r; | |
570 | } | |
571 | ||
7f4b3c5e | 572 | int running_in_chroot(void) { |
295ee984 LP |
573 | _cleanup_free_ char *self_mnt = NULL, *pid1_mnt = NULL; |
574 | int r; | |
575 | ||
576 | /* Try to detect whether we are running in a chroot() environment. Specifically, check whether we have a | |
577 | * different root directory than PID 1, even though we live in the same mount namespace as it. */ | |
7f4b3c5e | 578 | |
08a28eec LN |
579 | if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) |
580 | return 0; | |
581 | ||
295ee984 LP |
582 | r = files_same("/proc/1/root", "/"); |
583 | if (r < 0) | |
584 | return r; | |
585 | if (r > 0) | |
586 | return 0; | |
587 | ||
588 | r = readlink_malloc("/proc/self/ns/mnt", &self_mnt); | |
589 | if (r < 0) | |
590 | return r; | |
591 | ||
592 | r = readlink_malloc("/proc/1/ns/mnt", &pid1_mnt); | |
593 | if (r < 0) | |
594 | return r; | |
7f4b3c5e | 595 | |
295ee984 | 596 | return streq(self_mnt, pid1_mnt); /* Only if we live in the same namespace! */ |
7f4b3c5e LP |
597 | } |
598 | ||
75f86906 LP |
599 | static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { |
600 | [VIRTUALIZATION_NONE] = "none", | |
601 | [VIRTUALIZATION_KVM] = "kvm", | |
602 | [VIRTUALIZATION_QEMU] = "qemu", | |
603 | [VIRTUALIZATION_BOCHS] = "bochs", | |
604 | [VIRTUALIZATION_XEN] = "xen", | |
605 | [VIRTUALIZATION_UML] = "uml", | |
606 | [VIRTUALIZATION_VMWARE] = "vmware", | |
607 | [VIRTUALIZATION_ORACLE] = "oracle", | |
608 | [VIRTUALIZATION_MICROSOFT] = "microsoft", | |
609 | [VIRTUALIZATION_ZVM] = "zvm", | |
610 | [VIRTUALIZATION_PARALLELS] = "parallels", | |
aa0c3427 | 611 | [VIRTUALIZATION_BHYVE] = "bhyve", |
75f86906 LP |
612 | [VIRTUALIZATION_VM_OTHER] = "vm-other", |
613 | ||
614 | [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", | |
615 | [VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt", | |
616 | [VIRTUALIZATION_LXC] = "lxc", | |
617 | [VIRTUALIZATION_OPENVZ] = "openvz", | |
618 | [VIRTUALIZATION_DOCKER] = "docker", | |
9fb16425 | 619 | [VIRTUALIZATION_RKT] = "rkt", |
75f86906 LP |
620 | [VIRTUALIZATION_CONTAINER_OTHER] = "container-other", |
621 | }; | |
622 | ||
623 | DEFINE_STRING_TABLE_LOOKUP(virtualization, int); |