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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <unistd.h> | |
23 | #include <fcntl.h> | |
24 | ||
25 | #include "util.h" | |
26 | #include "utf8.h" | |
27 | #include "efivars.h" | |
28 | ||
29 | #define EFI_VENDOR_LOADER SD_ID128_MAKE(4a,67,b0,82,0a,4c,41,cf,b6,c7,44,0b,29,bb,8c,4f) | |
30 | ||
34e5a31e LP |
31 | bool is_efiboot(void) { |
32 | return access("/sys/firmware/efi", F_OK) >= 0; | |
33 | } | |
34 | ||
2e3d0692 LP |
35 | int efi_get_variable(sd_id128_t vendor, const char *name, uint32_t *attribute, void **value, size_t *size) { |
36 | _cleanup_close_ int fd = -1; | |
37 | _cleanup_free_ char *p = NULL; | |
38 | uint32_t a; | |
39 | ssize_t n; | |
40 | struct stat st; | |
41 | void *r; | |
42 | ||
43 | assert(name); | |
44 | assert(value); | |
45 | assert(size); | |
46 | ||
47 | if (asprintf(&p, | |
48 | "/sys/firmware/efi/efivars/%s-%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
49 | name, SD_ID128_FORMAT_VAL(vendor)) < 0) | |
50 | return -ENOMEM; | |
51 | ||
52 | fd = open(p, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
53 | if (fd < 0) | |
54 | return -errno; | |
55 | ||
56 | if (fstat(fd, &st) < 0) | |
57 | return -errno; | |
58 | if (st.st_size < 4) | |
59 | return -EIO; | |
60 | if (st.st_size > 4*1024*1024 + 4) | |
61 | return -E2BIG; | |
62 | ||
63 | n = read(fd, &a, sizeof(a)); | |
64 | if (n < 0) | |
65 | return (int) n; | |
66 | if (n != sizeof(a)) | |
67 | return -EIO; | |
68 | ||
69 | r = malloc(st.st_size - 4 + 2); | |
70 | if (!r) | |
71 | return -ENOMEM; | |
72 | ||
73 | n = read(fd, r, (size_t) st.st_size - 4); | |
74 | if (n < 0) { | |
75 | free(r); | |
76 | return (int) -n; | |
77 | } | |
78 | if (n != (ssize_t) st.st_size - 4) { | |
79 | free(r); | |
80 | return -EIO; | |
81 | } | |
82 | ||
83 | /* Always NUL terminate (2 bytes, to protect UTF-16) */ | |
84 | ((char*) r)[st.st_size - 4] = 0; | |
85 | ((char*) r)[st.st_size - 4 + 1] = 0; | |
86 | ||
87 | *value = r; | |
88 | *size = (size_t) st.st_size; | |
89 | ||
90 | if (attribute) | |
91 | *attribute = a; | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
5dbe9f53 | 96 | static int read_usec(sd_id128_t vendor, const char *name, usec_t *u) { |
2e3d0692 LP |
97 | _cleanup_free_ void *i = NULL; |
98 | _cleanup_free_ char *j = NULL; | |
99 | size_t is; | |
100 | int r; | |
101 | uint64_t x; | |
102 | ||
103 | assert(name); | |
104 | assert(u); | |
105 | ||
106 | r = efi_get_variable(EFI_VENDOR_LOADER, name, NULL, &i, &is); | |
107 | if (r < 0) | |
108 | return r; | |
109 | ||
110 | j = utf16_to_utf8(i, is); | |
111 | if (!j) | |
112 | return -ENOMEM; | |
113 | ||
114 | r = safe_atou64(j, &x); | |
115 | if (r < 0) | |
116 | return r; | |
117 | ||
5dbe9f53 | 118 | *u = x; |
2e3d0692 LP |
119 | return 0; |
120 | } | |
121 | ||
122 | static int get_boot_usec(usec_t *firmware, usec_t *loader) { | |
123 | uint64_t x, y; | |
124 | int r; | |
2e3d0692 LP |
125 | |
126 | assert(firmware); | |
127 | assert(loader); | |
128 | ||
e9cea16d | 129 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeInitUSec", &x); |
2e3d0692 LP |
130 | if (r < 0) |
131 | return r; | |
132 | ||
e9cea16d | 133 | r = read_usec(EFI_VENDOR_LOADER, "LoaderTimeExecUSec", &y); |
2e3d0692 LP |
134 | if (r < 0) |
135 | return r; | |
136 | ||
137 | if (y == 0 || y < x) | |
138 | return -EIO; | |
139 | ||
140 | if (y > USEC_PER_HOUR) | |
141 | return -EIO; | |
142 | ||
143 | *firmware = x; | |
144 | *loader = y; | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | int efi_get_boot_timestamps(const dual_timestamp *n, dual_timestamp *firmware, dual_timestamp *loader) { | |
150 | usec_t x, y, a; | |
151 | int r; | |
152 | dual_timestamp _n; | |
153 | ||
154 | assert(firmware); | |
155 | assert(loader); | |
156 | ||
157 | if (!n) { | |
158 | dual_timestamp_get(&_n); | |
159 | n = &_n; | |
160 | } | |
161 | ||
162 | r = get_boot_usec(&x, &y); | |
163 | if (r < 0) | |
164 | return r; | |
165 | ||
166 | /* Let's convert this to timestamps where the firmware | |
167 | * began/loader began working. To make this more confusing: | |
168 | * since usec_t is unsigned and the kernel's monotonic clock | |
169 | * begins at kernel initialization we'll actually initialize | |
170 | * the monotonic timestamps here as negative of the actual | |
171 | * value. */ | |
172 | ||
173 | firmware->monotonic = y; | |
174 | loader->monotonic = y - x; | |
175 | ||
176 | a = n->monotonic + firmware->monotonic; | |
177 | firmware->realtime = n->realtime > a ? n->realtime - a : 0; | |
178 | ||
179 | a = n->monotonic + loader->monotonic; | |
180 | loader->realtime = n->realtime > a ? n->realtime - a : 0; | |
181 | ||
182 | return 0; | |
183 | } | |
f4ce2b3e LP |
184 | |
185 | int efi_get_loader_device_part_uuid(sd_id128_t *u) { | |
186 | _cleanup_free_ void *s = NULL; | |
187 | _cleanup_free_ char *p = NULL; | |
188 | size_t ss; | |
189 | int r, parsed[16]; | |
190 | unsigned i; | |
191 | ||
192 | assert(u); | |
193 | ||
194 | r = efi_get_variable(EFI_VENDOR_LOADER, "LoaderDevicePartUUID", NULL, &s, &ss); | |
195 | if (r < 0) | |
196 | return r; | |
197 | ||
198 | p = utf16_to_utf8(s, ss); | |
199 | if (!p) | |
200 | return -ENOMEM; | |
201 | ||
202 | if (sscanf(p, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x", | |
203 | &parsed[0], &parsed[1], &parsed[2], &parsed[3], | |
204 | &parsed[4], &parsed[5], &parsed[6], &parsed[7], | |
205 | &parsed[8], &parsed[9], &parsed[10], &parsed[11], | |
206 | &parsed[12], &parsed[13], &parsed[14], &parsed[15]) != 16) | |
207 | return -EIO; | |
208 | ||
209 | for (i = 0; i < ELEMENTSOF(parsed); i++) | |
210 | u->bytes[i] = parsed[i]; | |
211 | ||
212 | return 0; | |
213 | } |