diff options
Diffstat (limited to 'src/basic/virt.c')
| -rw-r--r-- | src/basic/virt.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/basic/virt.c b/src/basic/virt.c index dace1f4328..d8d57381ad 100644 --- a/src/basic/virt.c +++ b/src/basic/virt.c @@ -33,6 +33,7 @@ #include "string-table.h" #include "string-util.h" #include "virt.h" +#include "env-util.h" static int detect_vm_cpuid(void) { @@ -49,6 +50,8 @@ static int detect_vm_cpuid(void) { { "VMwareVMware", VIRTUALIZATION_VMWARE }, /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */ { "Microsoft Hv", VIRTUALIZATION_MICROSOFT }, + /* https://wiki.freebsd.org/bhyve */ + { "bhyve bhyve ", VIRTUALIZATION_BHYVE }, }; uint32_t eax, ecx; @@ -178,6 +181,8 @@ static int detect_vm_dmi(void) { { "Xen", VIRTUALIZATION_XEN }, { "Bochs", VIRTUALIZATION_BOCHS }, { "Parallels", VIRTUALIZATION_PARALLELS }, + /* https://wiki.freebsd.org/bhyve */ + { "BHYVE", VIRTUALIZATION_BHYVE }, }; unsigned i; int r; @@ -480,9 +485,82 @@ int detect_virtualization(void) { return r; } +static int userns_has_mapping(const char *name) { + _cleanup_fclose_ FILE *f = NULL; + _cleanup_free_ char *buf = NULL; + size_t n_allocated = 0; + ssize_t n; + uint32_t a, b, c; + int r; + + f = fopen(name, "re"); + if (!f) { + log_debug_errno(errno, "Failed to open %s: %m", name); + return errno == ENOENT ? false : -errno; + } + + n = getline(&buf, &n_allocated, f); + if (n < 0) { + if (feof(f)) { + log_debug("%s is empty, we're in an uninitialized user namespace", name); + return true; + } + + return log_debug_errno(errno, "Failed to read %s: %m", name); + } + + r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c); + if (r < 3) + return log_debug_errno(errno, "Failed to parse %s: %m", name); + + if (a == 0 && b == 0 && c == UINT32_MAX) { + /* The kernel calls mappings_overlap() and does not allow overlaps */ + log_debug("%s has a full 1:1 mapping", name); + return false; + } + + /* Anything else implies that we are in a user namespace */ + log_debug("Mapping found in %s, we're in a user namespace", name); + return true; +} + +int running_in_userns(void) { + _cleanup_free_ char *line = NULL; + int r; + + r = userns_has_mapping("/proc/self/uid_map"); + if (r != 0) + return r; + + r = userns_has_mapping("/proc/self/gid_map"); + if (r != 0) + return r; + + /* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also + * possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups" + * also does not exist. We cannot distinguish those two cases, so assume that + * we're running on a stripped-down recent kernel, rather than on an old one, + * and if the file is not found, return false. + */ + r = read_one_line_file("/proc/self/setgroups", &line); + if (r < 0) { + log_debug_errno(r, "/proc/self/setgroups: %m"); + return r == -ENOENT ? false : r; + } + + truncate_nl(line); + r = streq(line, "deny"); + /* See user_namespaces(7) for a description of this "setgroups" contents. */ + log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in"); + return r; +} + int running_in_chroot(void) { int ret; + if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0) + return 0; + ret = files_same("/proc/1/root", "/"); if (ret < 0) return ret; @@ -502,6 +580,7 @@ static const char *const virtualization_table[_VIRTUALIZATION_MAX] = { [VIRTUALIZATION_MICROSOFT] = "microsoft", [VIRTUALIZATION_ZVM] = "zvm", [VIRTUALIZATION_PARALLELS] = "parallels", + [VIRTUALIZATION_BHYVE] = "bhyve", [VIRTUALIZATION_VM_OTHER] = "vm-other", [VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn", |