This source file includes following definitions.
- pubek_show
- pcrs_show
- enabled_show
- active_show
- owned_show
- temp_deactivated_show
- caps_show
- cancel_store
- durations_show
- timeouts_show
- tpm_sysfs_add_device
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15 #include <linux/device.h>
16 #include "tpm.h"
17
18 struct tpm_readpubek_out {
19 u8 algorithm[4];
20 u8 encscheme[2];
21 u8 sigscheme[2];
22 __be32 paramsize;
23 u8 parameters[12];
24 __be32 keysize;
25 u8 modulus[256];
26 u8 checksum[20];
27 } __packed;
28
29 #define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)
30 #define TPM_ORD_READPUBEK 124
31
32 static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,
33 char *buf)
34 {
35 struct tpm_buf tpm_buf;
36 struct tpm_readpubek_out *out;
37 int i;
38 char *str = buf;
39 struct tpm_chip *chip = to_tpm_chip(dev);
40 char anti_replay[20];
41
42 memset(&anti_replay, 0, sizeof(anti_replay));
43
44 if (tpm_try_get_ops(chip))
45 return 0;
46
47 if (tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK))
48 goto out_ops;
49
50 tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));
51
52 if (tpm_transmit_cmd(chip, &tpm_buf, READ_PUBEK_RESULT_MIN_BODY_SIZE,
53 "attempting to read the PUBEK"))
54 goto out_buf;
55
56 out = (struct tpm_readpubek_out *)&tpm_buf.data[10];
57 str +=
58 sprintf(str,
59 "Algorithm: %02X %02X %02X %02X\n"
60 "Encscheme: %02X %02X\n"
61 "Sigscheme: %02X %02X\n"
62 "Parameters: %02X %02X %02X %02X "
63 "%02X %02X %02X %02X "
64 "%02X %02X %02X %02X\n"
65 "Modulus length: %d\n"
66 "Modulus:\n",
67 out->algorithm[0], out->algorithm[1], out->algorithm[2],
68 out->algorithm[3],
69 out->encscheme[0], out->encscheme[1],
70 out->sigscheme[0], out->sigscheme[1],
71 out->parameters[0], out->parameters[1],
72 out->parameters[2], out->parameters[3],
73 out->parameters[4], out->parameters[5],
74 out->parameters[6], out->parameters[7],
75 out->parameters[8], out->parameters[9],
76 out->parameters[10], out->parameters[11],
77 be32_to_cpu(out->keysize));
78
79 for (i = 0; i < 256; i++) {
80 str += sprintf(str, "%02X ", out->modulus[i]);
81 if ((i + 1) % 16 == 0)
82 str += sprintf(str, "\n");
83 }
84
85 out_buf:
86 tpm_buf_destroy(&tpm_buf);
87 out_ops:
88 tpm_put_ops(chip);
89 return str - buf;
90 }
91 static DEVICE_ATTR_RO(pubek);
92
93 static ssize_t pcrs_show(struct device *dev, struct device_attribute *attr,
94 char *buf)
95 {
96 cap_t cap;
97 u8 digest[TPM_DIGEST_SIZE];
98 u32 i, j, num_pcrs;
99 char *str = buf;
100 struct tpm_chip *chip = to_tpm_chip(dev);
101
102 if (tpm_try_get_ops(chip))
103 return 0;
104
105 if (tpm1_getcap(chip, TPM_CAP_PROP_PCR, &cap,
106 "attempting to determine the number of PCRS",
107 sizeof(cap.num_pcrs))) {
108 tpm_put_ops(chip);
109 return 0;
110 }
111
112 num_pcrs = be32_to_cpu(cap.num_pcrs);
113 for (i = 0; i < num_pcrs; i++) {
114 if (tpm1_pcr_read(chip, i, digest)) {
115 str = buf;
116 break;
117 }
118 str += sprintf(str, "PCR-%02d: ", i);
119 for (j = 0; j < TPM_DIGEST_SIZE; j++)
120 str += sprintf(str, "%02X ", digest[j]);
121 str += sprintf(str, "\n");
122 }
123 tpm_put_ops(chip);
124 return str - buf;
125 }
126 static DEVICE_ATTR_RO(pcrs);
127
128 static ssize_t enabled_show(struct device *dev, struct device_attribute *attr,
129 char *buf)
130 {
131 struct tpm_chip *chip = to_tpm_chip(dev);
132 ssize_t rc = 0;
133 cap_t cap;
134
135 if (tpm_try_get_ops(chip))
136 return 0;
137
138 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
139 "attempting to determine the permanent enabled state",
140 sizeof(cap.perm_flags)))
141 goto out_ops;
142
143 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
144 out_ops:
145 tpm_put_ops(chip);
146 return rc;
147 }
148 static DEVICE_ATTR_RO(enabled);
149
150 static ssize_t active_show(struct device *dev, struct device_attribute *attr,
151 char *buf)
152 {
153 struct tpm_chip *chip = to_tpm_chip(dev);
154 ssize_t rc = 0;
155 cap_t cap;
156
157 if (tpm_try_get_ops(chip))
158 return 0;
159
160 if (tpm1_getcap(chip, TPM_CAP_FLAG_PERM, &cap,
161 "attempting to determine the permanent active state",
162 sizeof(cap.perm_flags)))
163 goto out_ops;
164
165 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
166 out_ops:
167 tpm_put_ops(chip);
168 return rc;
169 }
170 static DEVICE_ATTR_RO(active);
171
172 static ssize_t owned_show(struct device *dev, struct device_attribute *attr,
173 char *buf)
174 {
175 struct tpm_chip *chip = to_tpm_chip(dev);
176 ssize_t rc = 0;
177 cap_t cap;
178
179 if (tpm_try_get_ops(chip))
180 return 0;
181
182 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_PROP_OWNER, &cap,
183 "attempting to determine the owner state",
184 sizeof(cap.owned)))
185 goto out_ops;
186
187 rc = sprintf(buf, "%d\n", cap.owned);
188 out_ops:
189 tpm_put_ops(chip);
190 return rc;
191 }
192 static DEVICE_ATTR_RO(owned);
193
194 static ssize_t temp_deactivated_show(struct device *dev,
195 struct device_attribute *attr, char *buf)
196 {
197 struct tpm_chip *chip = to_tpm_chip(dev);
198 ssize_t rc = 0;
199 cap_t cap;
200
201 if (tpm_try_get_ops(chip))
202 return 0;
203
204 if (tpm1_getcap(to_tpm_chip(dev), TPM_CAP_FLAG_VOL, &cap,
205 "attempting to determine the temporary state",
206 sizeof(cap.stclear_flags)))
207 goto out_ops;
208
209 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
210 out_ops:
211 tpm_put_ops(chip);
212 return rc;
213 }
214 static DEVICE_ATTR_RO(temp_deactivated);
215
216 static ssize_t caps_show(struct device *dev, struct device_attribute *attr,
217 char *buf)
218 {
219 struct tpm_chip *chip = to_tpm_chip(dev);
220 ssize_t rc = 0;
221 char *str = buf;
222 cap_t cap;
223
224 if (tpm_try_get_ops(chip))
225 return 0;
226
227 if (tpm1_getcap(chip, TPM_CAP_PROP_MANUFACTURER, &cap,
228 "attempting to determine the manufacturer",
229 sizeof(cap.manufacturer_id)))
230 goto out_ops;
231
232 str += sprintf(str, "Manufacturer: 0x%x\n",
233 be32_to_cpu(cap.manufacturer_id));
234
235
236 rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
237 "attempting to determine the 1.2 version",
238 sizeof(cap.tpm_version_1_2));
239 if (!rc) {
240 str += sprintf(str,
241 "TCG version: %d.%d\nFirmware version: %d.%d\n",
242 cap.tpm_version_1_2.Major,
243 cap.tpm_version_1_2.Minor,
244 cap.tpm_version_1_2.revMajor,
245 cap.tpm_version_1_2.revMinor);
246 } else {
247
248 if (tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
249 "attempting to determine the 1.1 version",
250 sizeof(cap.tpm_version)))
251 goto out_ops;
252 str += sprintf(str,
253 "TCG version: %d.%d\nFirmware version: %d.%d\n",
254 cap.tpm_version.Major,
255 cap.tpm_version.Minor,
256 cap.tpm_version.revMajor,
257 cap.tpm_version.revMinor);
258 }
259 rc = str - buf;
260 out_ops:
261 tpm_put_ops(chip);
262 return rc;
263 }
264 static DEVICE_ATTR_RO(caps);
265
266 static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
268 {
269 struct tpm_chip *chip = to_tpm_chip(dev);
270
271 if (tpm_try_get_ops(chip))
272 return 0;
273
274 chip->ops->cancel(chip);
275 tpm_put_ops(chip);
276 return count;
277 }
278 static DEVICE_ATTR_WO(cancel);
279
280 static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
281 char *buf)
282 {
283 struct tpm_chip *chip = to_tpm_chip(dev);
284
285 if (chip->duration[TPM_LONG] == 0)
286 return 0;
287
288 return sprintf(buf, "%d %d %d [%s]\n",
289 jiffies_to_usecs(chip->duration[TPM_SHORT]),
290 jiffies_to_usecs(chip->duration[TPM_MEDIUM]),
291 jiffies_to_usecs(chip->duration[TPM_LONG]),
292 chip->duration_adjusted
293 ? "adjusted" : "original");
294 }
295 static DEVICE_ATTR_RO(durations);
296
297 static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
298 char *buf)
299 {
300 struct tpm_chip *chip = to_tpm_chip(dev);
301
302 return sprintf(buf, "%d %d %d %d [%s]\n",
303 jiffies_to_usecs(chip->timeout_a),
304 jiffies_to_usecs(chip->timeout_b),
305 jiffies_to_usecs(chip->timeout_c),
306 jiffies_to_usecs(chip->timeout_d),
307 chip->timeout_adjusted
308 ? "adjusted" : "original");
309 }
310 static DEVICE_ATTR_RO(timeouts);
311
312 static struct attribute *tpm_dev_attrs[] = {
313 &dev_attr_pubek.attr,
314 &dev_attr_pcrs.attr,
315 &dev_attr_enabled.attr,
316 &dev_attr_active.attr,
317 &dev_attr_owned.attr,
318 &dev_attr_temp_deactivated.attr,
319 &dev_attr_caps.attr,
320 &dev_attr_cancel.attr,
321 &dev_attr_durations.attr,
322 &dev_attr_timeouts.attr,
323 NULL,
324 };
325
326 static const struct attribute_group tpm_dev_group = {
327 .attrs = tpm_dev_attrs,
328 };
329
330 void tpm_sysfs_add_device(struct tpm_chip *chip)
331 {
332 if (chip->flags & TPM_CHIP_FLAG_TPM2)
333 return;
334
335 WARN_ON(chip->groups_cnt != 0);
336 chip->groups[chip->groups_cnt++] = &tpm_dev_group;
337 }