1 /* Print contents of object file note.
2 Copyright (C) 2002, 2007, 2009, 2011, 2015, 2016, 2018 Red Hat, Inc.
3 This file is part of elfutils.
4 Written by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 This file is free software; you can redistribute it and/or modify
7 it under the terms of either
8
9 * the GNU Lesser General Public License as published by the Free
10 Software Foundation; either version 3 of the License, or (at
11 your option) any later version
12
13 or
14
15 * the GNU General Public License as published by the Free
16 Software Foundation; either version 2 of the License, or (at
17 your option) any later version
18
19 or both in parallel, as here.
20
21 elfutils is distributed in the hope that it will be useful, but
22 WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 General Public License for more details.
25
26 You should have received copies of the GNU General Public License and
27 the GNU Lesser General Public License along with this program. If
28 not, see <http://www.gnu.org/licenses/>. */
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #include <inttypes.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <libeblP.h>
39
40 #include "common.h"
41 #include "libelfP.h"
42 #include "libdwP.h"
43 #include "memory-access.h"
44
45
46 void
ebl_object_note(Ebl * ebl,uint32_t namesz,const char * name,uint32_t type,uint32_t descsz,const char * desc)47 ebl_object_note (Ebl *ebl, uint32_t namesz, const char *name, uint32_t type,
48 uint32_t descsz, const char *desc)
49 {
50 if (! ebl->object_note (name, type, descsz, desc))
51 {
52 /* The machine specific function did not know this type. */
53
54 if (strcmp ("stapsdt", name) == 0)
55 {
56 if (type != 3)
57 {
58 printf (_("unknown SDT version %u\n"), type);
59 return;
60 }
61
62 /* Descriptor starts with three addresses, pc, base ref and
63 semaphore. Then three zero terminated strings provider,
64 name and arguments. */
65
66 union
67 {
68 Elf64_Addr a64[3];
69 Elf32_Addr a32[3];
70 } addrs;
71
72 size_t addrs_size = gelf_fsize (ebl->elf, ELF_T_ADDR, 3, EV_CURRENT);
73 if (descsz < addrs_size + 3)
74 {
75 invalid_sdt:
76 printf (_("invalid SDT probe descriptor\n"));
77 return;
78 }
79
80 Elf_Data src =
81 {
82 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
83 .d_buf = (void *) desc, .d_size = addrs_size
84 };
85
86 Elf_Data dst =
87 {
88 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
89 .d_buf = &addrs, .d_size = addrs_size
90 };
91
92 if (gelf_xlatetom (ebl->elf, &dst, &src,
93 elf_getident (ebl->elf, NULL)[EI_DATA]) == NULL)
94 {
95 printf ("%s\n", elf_errmsg (-1));
96 return;
97 }
98
99 const char *provider = desc + addrs_size;
100 const char *pname = memchr (provider, '\0', desc + descsz - provider);
101 if (pname == NULL)
102 goto invalid_sdt;
103
104 ++pname;
105 const char *args = memchr (pname, '\0', desc + descsz - pname);
106 if (args == NULL ||
107 memchr (++args, '\0', desc + descsz - pname) != desc + descsz - 1)
108 goto invalid_sdt;
109
110 GElf_Addr pc;
111 GElf_Addr base;
112 GElf_Addr sem;
113 if (gelf_getclass (ebl->elf) == ELFCLASS32)
114 {
115 pc = addrs.a32[0];
116 base = addrs.a32[1];
117 sem = addrs.a32[2];
118 }
119 else
120 {
121 pc = addrs.a64[0];
122 base = addrs.a64[1];
123 sem = addrs.a64[2];
124 }
125
126 printf (_(" PC: "));
127 printf ("%#" PRIx64 ",", pc);
128 printf (_(" Base: "));
129 printf ("%#" PRIx64 ",", base);
130 printf (_(" Semaphore: "));
131 printf ("%#" PRIx64 "\n", sem);
132 printf (_(" Provider: "));
133 printf ("%s,", provider);
134 printf (_(" Name: "));
135 printf ("%s,", pname);
136 printf (_(" Args: "));
137 printf ("'%s'\n", args);
138 return;
139 }
140
141 if (strncmp (name, ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX,
142 strlen (ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX)) == 0
143 && (type == NT_GNU_BUILD_ATTRIBUTE_OPEN
144 || type == NT_GNU_BUILD_ATTRIBUTE_FUNC))
145 {
146 /* There might or might not be a pair of addresses in the desc. */
147 if (descsz > 0)
148 {
149 printf (" Address Range: ");
150
151 union
152 {
153 Elf64_Addr a64[2];
154 Elf32_Addr a32[2];
155 } addrs;
156
157 size_t addr_size = gelf_fsize (ebl->elf, ELF_T_ADDR,
158 2, EV_CURRENT);
159 if (descsz != addr_size)
160 printf ("<unknown data>\n");
161 else
162 {
163 Elf_Data src =
164 {
165 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
166 .d_buf = (void *) desc, .d_size = descsz
167 };
168
169 Elf_Data dst =
170 {
171 .d_type = ELF_T_ADDR, .d_version = EV_CURRENT,
172 .d_buf = &addrs, .d_size = descsz
173 };
174
175 if (gelf_xlatetom (ebl->elf, &dst, &src,
176 elf_getident (ebl->elf,
177 NULL)[EI_DATA]) == NULL)
178 printf ("%s\n", elf_errmsg (-1));
179 else
180 {
181 if (addr_size == 4)
182 printf ("%#" PRIx32 " - %#" PRIx32 "\n",
183 addrs.a32[0], addrs.a32[1]);
184 else
185 printf ("%#" PRIx64 " - %#" PRIx64 "\n",
186 addrs.a64[0], addrs.a64[1]);
187 }
188 }
189 }
190
191 /* Most data actually is inside the name.
192 https://fedoraproject.org/wiki/Toolchain/Watermark */
193
194 /* We need at least 2 chars of data to describe the
195 attribute and value encodings. */
196 const char *data = (name
197 + strlen (ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX));
198 if (namesz < 2)
199 {
200 printf ("<insufficient data>\n");
201 return;
202 }
203
204 printf (" ");
205
206 /* In most cases the value comes right after the encoding bytes. */
207 const char *value = &data[2];
208 switch (data[1])
209 {
210 case GNU_BUILD_ATTRIBUTE_VERSION:
211 printf ("VERSION: ");
212 break;
213 case GNU_BUILD_ATTRIBUTE_STACK_PROT:
214 printf ("STACK_PROT: ");
215 break;
216 case GNU_BUILD_ATTRIBUTE_RELRO:
217 printf ("RELRO: ");
218 break;
219 case GNU_BUILD_ATTRIBUTE_STACK_SIZE:
220 printf ("STACK_SIZE: ");
221 break;
222 case GNU_BUILD_ATTRIBUTE_TOOL:
223 printf ("TOOL: ");
224 break;
225 case GNU_BUILD_ATTRIBUTE_ABI:
226 printf ("ABI: ");
227 break;
228 case GNU_BUILD_ATTRIBUTE_PIC:
229 printf ("PIC: ");
230 break;
231 case GNU_BUILD_ATTRIBUTE_SHORT_ENUM:
232 printf ("SHORT_ENUM: ");
233 break;
234 case 32 ... 126:
235 printf ("\"%s\": ", &data[1]);
236 value += strlen (&data[1]) + 1;
237 break;
238 default:
239 printf ("<unknown>: ");
240 break;
241 }
242
243 switch (data[0])
244 {
245 case GNU_BUILD_ATTRIBUTE_TYPE_NUMERIC:
246 {
247 /* Any numbers are always in (unsigned) little endian. */
248 static const Dwarf dbg
249 = { .other_byte_order = MY_ELFDATA != ELFDATA2LSB };
250 size_t bytes = namesz - (value - name);
251 uint64_t val;
252 if (bytes == 1)
253 val = *(unsigned char *) value;
254 else if (bytes == 2)
255 val = read_2ubyte_unaligned (&dbg, value);
256 else if (bytes == 4)
257 val = read_4ubyte_unaligned (&dbg, value);
258 else if (bytes == 8)
259 val = read_8ubyte_unaligned (&dbg, value);
260 else
261 goto unknown;
262 printf ("%" PRIx64, val);
263 }
264 break;
265 case GNU_BUILD_ATTRIBUTE_TYPE_STRING:
266 printf ("\"%s\"", value);
267 break;
268 case GNU_BUILD_ATTRIBUTE_TYPE_BOOL_TRUE:
269 printf ("TRUE");
270 break;
271 case GNU_BUILD_ATTRIBUTE_TYPE_BOOL_FALSE:
272 printf ("FALSE");
273 break;
274 default:
275 {
276 unknown:
277 printf ("<unknown>");
278 }
279 break;
280 }
281
282 printf ("\n");
283
284 return;
285 }
286
287 /* NT_VERSION doesn't have any info. All data is in the name. */
288 if (descsz == 0 && type == NT_VERSION)
289 return;
290
291 /* Everything else should have the "GNU" owner name. */
292 if (strcmp ("GNU", name) != 0)
293 return;
294
295 switch (type)
296 {
297 case NT_GNU_BUILD_ID:
298 if (strcmp (name, "GNU") == 0 && descsz > 0)
299 {
300 printf (_(" Build ID: "));
301 uint_fast32_t i;
302 for (i = 0; i < descsz - 1; ++i)
303 printf ("%02" PRIx8, (uint8_t) desc[i]);
304 printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
305 }
306 break;
307
308 case NT_GNU_GOLD_VERSION:
309 if (strcmp (name, "GNU") == 0 && descsz > 0)
310 /* A non-null terminated version string. */
311 printf (_(" Linker version: %.*s\n"),
312 (int) descsz, desc);
313 break;
314
315 case NT_GNU_PROPERTY_TYPE_0:
316 if (strcmp (name, "GNU") == 0 && descsz > 0)
317 {
318 /* There are at least 2 words. type and datasz. */
319 while (descsz >= 8)
320 {
321 struct pr_prop
322 {
323 GElf_Word pr_type;
324 GElf_Word pr_datasz;
325 } prop;
326
327 Elf_Data in =
328 {
329 .d_version = EV_CURRENT,
330 .d_type = ELF_T_WORD,
331 .d_size = 8,
332 .d_buf = (void *) desc
333 };
334 Elf_Data out =
335 {
336 .d_version = EV_CURRENT,
337 .d_type = ELF_T_WORD,
338 .d_size = descsz,
339 .d_buf = (void *) &prop
340 };
341
342 if (gelf_xlatetom (ebl->elf, &out, &in,
343 elf_getident (ebl->elf,
344 NULL)[EI_DATA]) == NULL)
345 {
346 printf ("%s\n", elf_errmsg (-1));
347 return;
348 }
349
350 desc += 8;
351 descsz -= 8;
352
353 if (prop.pr_datasz > descsz)
354 {
355 printf ("BAD property datasz: %" PRId32 "\n",
356 prop.pr_datasz);
357 return;
358 }
359
360 int elfclass = gelf_getclass (ebl->elf);
361 char *elfident = elf_getident (ebl->elf, NULL);
362 GElf_Ehdr ehdr;
363 gelf_getehdr (ebl->elf, &ehdr);
364
365 /* Prefix. */
366 printf (" ");
367 if (prop.pr_type == GNU_PROPERTY_STACK_SIZE)
368 {
369 printf ("STACK_SIZE ");
370 union
371 {
372 Elf64_Addr a64;
373 Elf32_Addr a32;
374 } addr;
375 if ((elfclass == ELFCLASS32 && prop.pr_datasz == 4)
376 || (elfclass == ELFCLASS64 && prop.pr_datasz == 8))
377 {
378 in.d_type = ELF_T_ADDR;
379 out.d_type = ELF_T_ADDR;
380 in.d_size = prop.pr_datasz;
381 out.d_size = prop.pr_datasz;
382 in.d_buf = (void *) desc;
383 out.d_buf = (elfclass == ELFCLASS32
384 ? (void *) &addr.a32
385 : (void *) &addr.a64);
386
387 if (gelf_xlatetom (ebl->elf, &out, &in,
388 elfident[EI_DATA]) == NULL)
389 {
390 printf ("%s\n", elf_errmsg (-1));
391 return;
392 }
393 if (elfclass == ELFCLASS32)
394 printf ("%#" PRIx32 "\n", addr.a32);
395 else
396 printf ("%#" PRIx64 "\n", addr.a64);
397 }
398 else
399 printf (" (garbage datasz: %" PRIx32 ")\n",
400 prop.pr_datasz);
401 }
402 else if (prop.pr_type == GNU_PROPERTY_NO_COPY_ON_PROTECTED)
403 {
404 printf ("NO_COPY_ON_PROTECTION");
405 if (prop.pr_datasz == 0)
406 printf ("\n");
407 else
408 printf (" (garbage datasz: %" PRIx32 ")\n",
409 prop.pr_datasz);
410 }
411 else if (prop.pr_type >= GNU_PROPERTY_LOPROC
412 && prop.pr_type <= GNU_PROPERTY_HIPROC
413 && (ehdr.e_machine == EM_386
414 || ehdr.e_machine == EM_X86_64))
415 {
416 printf ("X86 ");
417 if (prop.pr_type == GNU_PROPERTY_X86_FEATURE_1_AND)
418 {
419 printf ("FEATURE_1_AND: ");
420
421 if (prop.pr_datasz == 4)
422 {
423 GElf_Word data;
424 in.d_type = ELF_T_WORD;
425 out.d_type = ELF_T_WORD;
426 in.d_size = 4;
427 out.d_size = 4;
428 in.d_buf = (void *) desc;
429 out.d_buf = (void *) &data;
430
431 if (gelf_xlatetom (ebl->elf, &out, &in,
432 elfident[EI_DATA]) == NULL)
433 {
434 printf ("%s\n", elf_errmsg (-1));
435 return;
436 }
437 printf ("%08" PRIx32 " ", data);
438
439 if ((data & GNU_PROPERTY_X86_FEATURE_1_IBT)
440 != 0)
441 {
442 printf ("IBT");
443 data &= ~GNU_PROPERTY_X86_FEATURE_1_IBT;
444 if (data != 0)
445 printf (" ");
446 }
447
448 if ((data & GNU_PROPERTY_X86_FEATURE_1_SHSTK)
449 != 0)
450 {
451 printf ("SHSTK");
452 data &= ~GNU_PROPERTY_X86_FEATURE_1_SHSTK;
453 if (data != 0)
454 printf (" ");
455 }
456
457 if (data != 0)
458 printf ("UNKNOWN");
459 }
460 else
461 printf ("<bad datasz: %" PRId32 ">",
462 prop.pr_datasz);
463
464 printf ("\n");
465 }
466 else
467 {
468 printf ("%#" PRIx32, prop.pr_type);
469 if (prop.pr_datasz > 0)
470 {
471 printf (" data: ");
472 size_t i;
473 for (i = 0; i < prop.pr_datasz - 1; i++)
474 printf ("%02" PRIx8 " ", (uint8_t) desc[i]);
475 printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
476 }
477 }
478 }
479 else if (prop.pr_type >= GNU_PROPERTY_LOPROC
480 && prop.pr_type <= GNU_PROPERTY_HIPROC
481 && ehdr.e_machine == EM_AARCH64)
482 {
483 printf ("AARCH64 ");
484 if (prop.pr_type == GNU_PROPERTY_AARCH64_FEATURE_1_AND)
485 {
486 printf ("FEATURE_1_AND: ");
487
488 if (prop.pr_datasz == 4)
489 {
490 GElf_Word data;
491 in.d_type = ELF_T_WORD;
492 out.d_type = ELF_T_WORD;
493 in.d_size = 4;
494 out.d_size = 4;
495 in.d_buf = (void *) desc;
496 out.d_buf = (void *) &data;
497
498 if (gelf_xlatetom (ebl->elf, &out, &in,
499 elfident[EI_DATA]) == NULL)
500 {
501 printf ("%s\n", elf_errmsg (-1));
502 return;
503 }
504 printf ("%08" PRIx32 " ", data);
505
506 if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_BTI)
507 != 0)
508 {
509 printf ("BTI");
510 data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_BTI;
511 if (data != 0)
512 printf (" ");
513 }
514
515 if ((data & GNU_PROPERTY_AARCH64_FEATURE_1_PAC)
516 != 0)
517 {
518 printf ("PAC");
519 data &= ~GNU_PROPERTY_AARCH64_FEATURE_1_PAC;
520 if (data != 0)
521 printf (" ");
522 }
523
524 if (data != 0)
525 printf ("UNKNOWN");
526 }
527 else
528 printf ("<bad datasz: %" PRId32 ">",
529 prop.pr_datasz);
530
531 printf ("\n");
532 }
533 else
534 {
535 printf ("%#" PRIx32, prop.pr_type);
536 if (prop.pr_datasz > 0)
537 {
538 printf (" data: ");
539 size_t i;
540 for (i = 0; i < prop.pr_datasz - 1; i++)
541 printf ("%02" PRIx8 " ", (uint8_t) desc[i]);
542 printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
543 }
544 }
545 }
546 else
547 {
548 if (prop.pr_type >= GNU_PROPERTY_LOPROC
549 && prop.pr_type <= GNU_PROPERTY_HIPROC)
550 printf ("proc_type %#" PRIx32, prop.pr_type);
551 else if (prop.pr_type >= GNU_PROPERTY_LOUSER
552 && prop.pr_type <= GNU_PROPERTY_HIUSER)
553 printf ("app_type %#" PRIx32, prop.pr_type);
554 else
555 printf ("unknown_type %#" PRIx32, prop.pr_type);
556
557 if (prop.pr_datasz > 0)
558 {
559 printf (" data: ");
560 size_t i;
561 for (i = 0; i < prop.pr_datasz - 1; i++)
562 printf ("%02" PRIx8 " ", (uint8_t) desc[i]);
563 printf ("%02" PRIx8 "\n", (uint8_t) desc[i]);
564 }
565 }
566
567 if (elfclass == ELFCLASS32)
568 prop.pr_datasz = NOTE_ALIGN4 (prop.pr_datasz);
569 else
570 prop.pr_datasz = NOTE_ALIGN8 (prop.pr_datasz);
571
572 desc += prop.pr_datasz;
573 if (descsz > prop.pr_datasz)
574 descsz -= prop.pr_datasz;
575 else
576 descsz = 0;
577 }
578 }
579 break;
580
581 case NT_GNU_ABI_TAG:
582 if (descsz >= 8 && descsz % 4 == 0)
583 {
584 Elf_Data in =
585 {
586 .d_version = EV_CURRENT,
587 .d_type = ELF_T_WORD,
588 .d_size = descsz,
589 .d_buf = (void *) desc
590 };
591 /* Normally NT_GNU_ABI_TAG is just 4 words (16 bytes). If it
592 is much (4*) larger dynamically allocate memory to convert. */
593 #define FIXED_TAG_BYTES 16
594 uint32_t sbuf[FIXED_TAG_BYTES];
595 uint32_t *buf;
596 if (unlikely (descsz / 4 > FIXED_TAG_BYTES))
597 {
598 buf = malloc (descsz);
599 if (unlikely (buf == NULL))
600 return;
601 }
602 else
603 buf = sbuf;
604 Elf_Data out =
605 {
606 .d_version = EV_CURRENT,
607 .d_type = ELF_T_WORD,
608 .d_size = descsz,
609 .d_buf = buf
610 };
611
612 if (elf32_xlatetom (&out, &in, ebl->data) != NULL)
613 {
614 const char *os;
615 switch (buf[0])
616 {
617 case ELF_NOTE_OS_LINUX:
618 os = "Linux";
619 break;
620
621 case ELF_NOTE_OS_GNU:
622 os = "GNU";
623 break;
624
625 case ELF_NOTE_OS_SOLARIS2:
626 os = "Solaris";
627 break;
628
629 case ELF_NOTE_OS_FREEBSD:
630 os = "FreeBSD";
631 break;
632
633 default:
634 os = "???";
635 break;
636 }
637
638 printf (_(" OS: %s, ABI: "), os);
639 for (size_t cnt = 1; cnt < descsz / 4; ++cnt)
640 {
641 if (cnt > 1)
642 putchar_unlocked ('.');
643 printf ("%" PRIu32, buf[cnt]);
644 }
645 putchar_unlocked ('\n');
646 }
647 if (descsz / 4 > FIXED_TAG_BYTES)
648 free (buf);
649 break;
650 }
651 FALLTHROUGH;
652
653 default:
654 /* Unknown type. */
655 break;
656 }
657 }
658 }
659