1#include "symbol.h"
  2#include "util.h"
  3
 
  4#include <stdio.h>
  5#include <fcntl.h>
  6#include <string.h>
  7#include <byteswap.h>
  8#include <sys/stat.h>
  9
 10
 11static bool check_need_swap(int file_endian)
 12{
 13	const int data = 1;
 14	u8 *check = (u8 *)&data;
 15	int host_endian;
 16
 17	if (check[0] == 1)
 18		host_endian = ELFDATA2LSB;
 19	else
 20		host_endian = ELFDATA2MSB;
 21
 22	return host_endian != file_endian;
 23}
 24
 25#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
 26
 27#define NT_GNU_BUILD_ID	3
 28
 29static int read_build_id(void *note_data, size_t note_len, void *bf,
 30			 size_t size, bool need_swap)
 31{
 32	struct {
 33		u32 n_namesz;
 34		u32 n_descsz;
 35		u32 n_type;
 36	} *nhdr;
 37	void *ptr;
 38
 39	ptr = note_data;
 40	while (ptr < (note_data + note_len)) {
 41		const char *name;
 42		size_t namesz, descsz;
 43
 44		nhdr = ptr;
 45		if (need_swap) {
 46			nhdr->n_namesz = bswap_32(nhdr->n_namesz);
 47			nhdr->n_descsz = bswap_32(nhdr->n_descsz);
 48			nhdr->n_type = bswap_32(nhdr->n_type);
 49		}
 50
 51		namesz = NOTE_ALIGN(nhdr->n_namesz);
 52		descsz = NOTE_ALIGN(nhdr->n_descsz);
 53
 54		ptr += sizeof(*nhdr);
 55		name = ptr;
 56		ptr += namesz;
 57		if (nhdr->n_type == NT_GNU_BUILD_ID &&
 58		    nhdr->n_namesz == sizeof("GNU")) {
 59			if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
 60				size_t sz = min(size, descsz);
 61				memcpy(bf, ptr, sz);
 62				memset(bf + sz, 0, size - sz);
 63				return 0;
 64			}
 65		}
 66		ptr += descsz;
 67	}
 68
 69	return -1;
 70}
 71
 72int filename__read_debuglink(const char *filename __maybe_unused,
 73			     char *debuglink __maybe_unused,
 74			     size_t size __maybe_unused)
 75{
 76	return -1;
 77}
 78
 79/*
 80 * Just try PT_NOTE header otherwise fails
 81 */
 82int filename__read_build_id(const char *filename, void *bf, size_t size)
 83{
 84	FILE *fp;
 85	int ret = -1;
 86	bool need_swap = false;
 87	u8 e_ident[EI_NIDENT];
 88	size_t buf_size;
 89	void *buf;
 90	int i;
 91
 92	fp = fopen(filename, "r");
 93	if (fp == NULL)
 94		return -1;
 95
 96	if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
 97		goto out;
 98
 99	if (memcmp(e_ident, ELFMAG, SELFMAG) ||
100	    e_ident[EI_VERSION] != EV_CURRENT)
101		goto out;
102
103	need_swap = check_need_swap(e_ident[EI_DATA]);
104
105	/* for simplicity */
106	fseek(fp, 0, SEEK_SET);
107
108	if (e_ident[EI_CLASS] == ELFCLASS32) {
109		Elf32_Ehdr ehdr;
110		Elf32_Phdr *phdr;
111
112		if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
113			goto out;
114
115		if (need_swap) {
116			ehdr.e_phoff = bswap_32(ehdr.e_phoff);
117			ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
118			ehdr.e_phnum = bswap_16(ehdr.e_phnum);
119		}
120
121		buf_size = ehdr.e_phentsize * ehdr.e_phnum;
122		buf = malloc(buf_size);
123		if (buf == NULL)
124			goto out;
125
126		fseek(fp, ehdr.e_phoff, SEEK_SET);
127		if (fread(buf, buf_size, 1, fp) != 1)
128			goto out_free;
129
130		for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
131			void *tmp;
132			long offset;
133
134			if (need_swap) {
135				phdr->p_type = bswap_32(phdr->p_type);
136				phdr->p_offset = bswap_32(phdr->p_offset);
137				phdr->p_filesz = bswap_32(phdr->p_filesz);
138			}
139
140			if (phdr->p_type != PT_NOTE)
141				continue;
142
143			buf_size = phdr->p_filesz;
144			offset = phdr->p_offset;
145			tmp = realloc(buf, buf_size);
146			if (tmp == NULL)
147				goto out_free;
148
149			buf = tmp;
150			fseek(fp, offset, SEEK_SET);
151			if (fread(buf, buf_size, 1, fp) != 1)
152				goto out_free;
153
154			ret = read_build_id(buf, buf_size, bf, size, need_swap);
155			if (ret == 0)
156				ret = size;
157			break;
158		}
159	} else {
160		Elf64_Ehdr ehdr;
161		Elf64_Phdr *phdr;
162
163		if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
164			goto out;
165
166		if (need_swap) {
167			ehdr.e_phoff = bswap_64(ehdr.e_phoff);
168			ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
169			ehdr.e_phnum = bswap_16(ehdr.e_phnum);
170		}
171
172		buf_size = ehdr.e_phentsize * ehdr.e_phnum;
173		buf = malloc(buf_size);
174		if (buf == NULL)
175			goto out;
176
177		fseek(fp, ehdr.e_phoff, SEEK_SET);
178		if (fread(buf, buf_size, 1, fp) != 1)
179			goto out_free;
180
181		for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
182			void *tmp;
183			long offset;
184
185			if (need_swap) {
186				phdr->p_type = bswap_32(phdr->p_type);
187				phdr->p_offset = bswap_64(phdr->p_offset);
188				phdr->p_filesz = bswap_64(phdr->p_filesz);
189			}
190
191			if (phdr->p_type != PT_NOTE)
192				continue;
193
194			buf_size = phdr->p_filesz;
195			offset = phdr->p_offset;
196			tmp = realloc(buf, buf_size);
197			if (tmp == NULL)
198				goto out_free;
199
200			buf = tmp;
201			fseek(fp, offset, SEEK_SET);
202			if (fread(buf, buf_size, 1, fp) != 1)
203				goto out_free;
204
205			ret = read_build_id(buf, buf_size, bf, size, need_swap);
206			if (ret == 0)
207				ret = size;
208			break;
209		}
210	}
211out_free:
212	free(buf);
213out:
214	fclose(fp);
215	return ret;
216}
217
218int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
219{
220	int fd;
221	int ret = -1;
222	struct stat stbuf;
223	size_t buf_size;
224	void *buf;
225
226	fd = open(filename, O_RDONLY);
227	if (fd < 0)
228		return -1;
229
230	if (fstat(fd, &stbuf) < 0)
231		goto out;
232
233	buf_size = stbuf.st_size;
234	buf = malloc(buf_size);
235	if (buf == NULL)
236		goto out;
237
238	if (read(fd, buf, buf_size) != (ssize_t) buf_size)
239		goto out_free;
240
241	ret = read_build_id(buf, buf_size, build_id, size, false);
242out_free:
243	free(buf);
244out:
245	close(fd);
246	return ret;
247}
248
249int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
250	         enum dso_binary_type type)
251{
252	int fd = open(name, O_RDONLY);
253	if (fd < 0)
254		goto out_errno;
255
256	ss->name = strdup(name);
257	if (!ss->name)
258		goto out_close;
259
260	ss->fd = fd;
261	ss->type = type;
262
263	return 0;
264out_close:
265	close(fd);
266out_errno:
267	dso->load_errno = errno;
268	return -1;
269}
270
271bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
272{
273	/* Assume all sym sources could be a runtime image. */
274	return true;
275}
276
277bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
278{
279	return false;
280}
281
282void symsrc__destroy(struct symsrc *ss)
283{
284	zfree(&ss->name);
285	close(ss->fd);
286}
287
288int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
289				struct symsrc *ss __maybe_unused,
290				struct map *map __maybe_unused,
291				symbol_filter_t filter __maybe_unused)
292{
293	return 0;
294}
295
296static int fd__is_64_bit(int fd)
297{
298	u8 e_ident[EI_NIDENT];
299
300	if (lseek(fd, 0, SEEK_SET))
301		return -1;
302
303	if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
304		return -1;
305
306	if (memcmp(e_ident, ELFMAG, SELFMAG) ||
307	    e_ident[EI_VERSION] != EV_CURRENT)
308		return -1;
309
310	return e_ident[EI_CLASS] == ELFCLASS64;
311}
312
313enum dso_type dso__type_fd(int fd)
314{
315	Elf64_Ehdr ehdr;
316	int ret;
317
318	ret = fd__is_64_bit(fd);
319	if (ret < 0)
320		return DSO__TYPE_UNKNOWN;
321
322	if (ret)
323		return DSO__TYPE_64BIT;
324
325	if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
326		return DSO__TYPE_UNKNOWN;
327
328	if (ehdr.e_machine == EM_X86_64)
329		return DSO__TYPE_X32BIT;
330
331	return DSO__TYPE_32BIT;
332}
333
334int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
335		  struct symsrc *ss,
336		  struct symsrc *runtime_ss __maybe_unused,
337		  symbol_filter_t filter __maybe_unused,
338		  int kmodule __maybe_unused)
339{
340	unsigned char build_id[BUILD_ID_SIZE];
341	int ret;
342
343	ret = fd__is_64_bit(ss->fd);
344	if (ret >= 0)
345		dso->is_64_bit = ret;
346
347	if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
348		dso__set_build_id(dso, build_id);
349	}
350	return 0;
351}
352
353int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
354		    mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
355		    bool *is_64_bit __maybe_unused)
356{
357	return -1;
358}
359
360int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
361{
362	return -1;
363}
364
365void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
366{
367}
368
369int kcore_copy(const char *from_dir __maybe_unused,
370	       const char *to_dir __maybe_unused)
371{
372	return -1;
373}
374
375void symbol__elf_init(void)
376{
 
 
 
 
 
 
 
377}

  1// SPDX-License-Identifier: GPL-2.0
  2#include "symbol.h"
  3#include "util.h"
  4
  5#include <errno.h>
  6#include <stdio.h>
  7#include <fcntl.h>
  8#include <string.h>
  9#include <byteswap.h>
 10#include <sys/stat.h>
 11
 12
 13static bool check_need_swap(int file_endian)
 14{
 15	const int data = 1;
 16	u8 *check = (u8 *)&data;
 17	int host_endian;
 18
 19	if (check[0] == 1)
 20		host_endian = ELFDATA2LSB;
 21	else
 22		host_endian = ELFDATA2MSB;
 23
 24	return host_endian != file_endian;
 25}
 26
 27#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
 28
 29#define NT_GNU_BUILD_ID	3
 30
 31static int read_build_id(void *note_data, size_t note_len, void *bf,
 32			 size_t size, bool need_swap)
 33{
 34	struct {
 35		u32 n_namesz;
 36		u32 n_descsz;
 37		u32 n_type;
 38	} *nhdr;
 39	void *ptr;
 40
 41	ptr = note_data;
 42	while (ptr < (note_data + note_len)) {
 43		const char *name;
 44		size_t namesz, descsz;
 45
 46		nhdr = ptr;
 47		if (need_swap) {
 48			nhdr->n_namesz = bswap_32(nhdr->n_namesz);
 49			nhdr->n_descsz = bswap_32(nhdr->n_descsz);
 50			nhdr->n_type = bswap_32(nhdr->n_type);
 51		}
 52
 53		namesz = NOTE_ALIGN(nhdr->n_namesz);
 54		descsz = NOTE_ALIGN(nhdr->n_descsz);
 55
 56		ptr += sizeof(*nhdr);
 57		name = ptr;
 58		ptr += namesz;
 59		if (nhdr->n_type == NT_GNU_BUILD_ID &&
 60		    nhdr->n_namesz == sizeof("GNU")) {
 61			if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
 62				size_t sz = min(size, descsz);
 63				memcpy(bf, ptr, sz);
 64				memset(bf + sz, 0, size - sz);
 65				return 0;
 66			}
 67		}
 68		ptr += descsz;
 69	}
 70
 71	return -1;
 72}
 73
 74int filename__read_debuglink(const char *filename __maybe_unused,
 75			     char *debuglink __maybe_unused,
 76			     size_t size __maybe_unused)
 77{
 78	return -1;
 79}
 80
 81/*
 82 * Just try PT_NOTE header otherwise fails
 83 */
 84int filename__read_build_id(const char *filename, void *bf, size_t size)
 85{
 86	FILE *fp;
 87	int ret = -1;
 88	bool need_swap = false;
 89	u8 e_ident[EI_NIDENT];
 90	size_t buf_size;
 91	void *buf;
 92	int i;
 93
 94	fp = fopen(filename, "r");
 95	if (fp == NULL)
 96		return -1;
 97
 98	if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
 99		goto out;
100
101	if (memcmp(e_ident, ELFMAG, SELFMAG) ||
102	    e_ident[EI_VERSION] != EV_CURRENT)
103		goto out;
104
105	need_swap = check_need_swap(e_ident[EI_DATA]);
106
107	/* for simplicity */
108	fseek(fp, 0, SEEK_SET);
109
110	if (e_ident[EI_CLASS] == ELFCLASS32) {
111		Elf32_Ehdr ehdr;
112		Elf32_Phdr *phdr;
113
114		if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
115			goto out;
116
117		if (need_swap) {
118			ehdr.e_phoff = bswap_32(ehdr.e_phoff);
119			ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
120			ehdr.e_phnum = bswap_16(ehdr.e_phnum);
121		}
122
123		buf_size = ehdr.e_phentsize * ehdr.e_phnum;
124		buf = malloc(buf_size);
125		if (buf == NULL)
126			goto out;
127
128		fseek(fp, ehdr.e_phoff, SEEK_SET);
129		if (fread(buf, buf_size, 1, fp) != 1)
130			goto out_free;
131
132		for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
133			void *tmp;
134			long offset;
135
136			if (need_swap) {
137				phdr->p_type = bswap_32(phdr->p_type);
138				phdr->p_offset = bswap_32(phdr->p_offset);
139				phdr->p_filesz = bswap_32(phdr->p_filesz);
140			}
141
142			if (phdr->p_type != PT_NOTE)
143				continue;
144
145			buf_size = phdr->p_filesz;
146			offset = phdr->p_offset;
147			tmp = realloc(buf, buf_size);
148			if (tmp == NULL)
149				goto out_free;
150
151			buf = tmp;
152			fseek(fp, offset, SEEK_SET);
153			if (fread(buf, buf_size, 1, fp) != 1)
154				goto out_free;
155
156			ret = read_build_id(buf, buf_size, bf, size, need_swap);
157			if (ret == 0)
158				ret = size;
159			break;
160		}
161	} else {
162		Elf64_Ehdr ehdr;
163		Elf64_Phdr *phdr;
164
165		if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
166			goto out;
167
168		if (need_swap) {
169			ehdr.e_phoff = bswap_64(ehdr.e_phoff);
170			ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
171			ehdr.e_phnum = bswap_16(ehdr.e_phnum);
172		}
173
174		buf_size = ehdr.e_phentsize * ehdr.e_phnum;
175		buf = malloc(buf_size);
176		if (buf == NULL)
177			goto out;
178
179		fseek(fp, ehdr.e_phoff, SEEK_SET);
180		if (fread(buf, buf_size, 1, fp) != 1)
181			goto out_free;
182
183		for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
184			void *tmp;
185			long offset;
186
187			if (need_swap) {
188				phdr->p_type = bswap_32(phdr->p_type);
189				phdr->p_offset = bswap_64(phdr->p_offset);
190				phdr->p_filesz = bswap_64(phdr->p_filesz);
191			}
192
193			if (phdr->p_type != PT_NOTE)
194				continue;
195
196			buf_size = phdr->p_filesz;
197			offset = phdr->p_offset;
198			tmp = realloc(buf, buf_size);
199			if (tmp == NULL)
200				goto out_free;
201
202			buf = tmp;
203			fseek(fp, offset, SEEK_SET);
204			if (fread(buf, buf_size, 1, fp) != 1)
205				goto out_free;
206
207			ret = read_build_id(buf, buf_size, bf, size, need_swap);
208			if (ret == 0)
209				ret = size;
210			break;
211		}
212	}
213out_free:
214	free(buf);
215out:
216	fclose(fp);
217	return ret;
218}
219
220int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
221{
222	int fd;
223	int ret = -1;
224	struct stat stbuf;
225	size_t buf_size;
226	void *buf;
227
228	fd = open(filename, O_RDONLY);
229	if (fd < 0)
230		return -1;
231
232	if (fstat(fd, &stbuf) < 0)
233		goto out;
234
235	buf_size = stbuf.st_size;
236	buf = malloc(buf_size);
237	if (buf == NULL)
238		goto out;
239
240	if (read(fd, buf, buf_size) != (ssize_t) buf_size)
241		goto out_free;
242
243	ret = read_build_id(buf, buf_size, build_id, size, false);
244out_free:
245	free(buf);
246out:
247	close(fd);
248	return ret;
249}
250
251int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
252	         enum dso_binary_type type)
253{
254	int fd = open(name, O_RDONLY);
255	if (fd < 0)
256		goto out_errno;
257
258	ss->name = strdup(name);
259	if (!ss->name)
260		goto out_close;
261
262	ss->fd = fd;
263	ss->type = type;
264
265	return 0;
266out_close:
267	close(fd);
268out_errno:
269	dso->load_errno = errno;
270	return -1;
271}
272
273bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
274{
275	/* Assume all sym sources could be a runtime image. */
276	return true;
277}
278
279bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
280{
281	return false;
282}
283
284void symsrc__destroy(struct symsrc *ss)
285{
286	zfree(&ss->name);
287	close(ss->fd);
288}
289
290int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
291				struct symsrc *ss __maybe_unused,
292				struct map *map __maybe_unused)
 
293{
294	return 0;
295}
296
297static int fd__is_64_bit(int fd)
298{
299	u8 e_ident[EI_NIDENT];
300
301	if (lseek(fd, 0, SEEK_SET))
302		return -1;
303
304	if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
305		return -1;
306
307	if (memcmp(e_ident, ELFMAG, SELFMAG) ||
308	    e_ident[EI_VERSION] != EV_CURRENT)
309		return -1;
310
311	return e_ident[EI_CLASS] == ELFCLASS64;
312}
313
314enum dso_type dso__type_fd(int fd)
315{
316	Elf64_Ehdr ehdr;
317	int ret;
318
319	ret = fd__is_64_bit(fd);
320	if (ret < 0)
321		return DSO__TYPE_UNKNOWN;
322
323	if (ret)
324		return DSO__TYPE_64BIT;
325
326	if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
327		return DSO__TYPE_UNKNOWN;
328
329	if (ehdr.e_machine == EM_X86_64)
330		return DSO__TYPE_X32BIT;
331
332	return DSO__TYPE_32BIT;
333}
334
335int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
336		  struct symsrc *ss,
337		  struct symsrc *runtime_ss __maybe_unused,
 
338		  int kmodule __maybe_unused)
339{
340	unsigned char build_id[BUILD_ID_SIZE];
341	int ret;
342
343	ret = fd__is_64_bit(ss->fd);
344	if (ret >= 0)
345		dso->is_64_bit = ret;
346
347	if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
348		dso__set_build_id(dso, build_id);
349	}
350	return 0;
351}
352
353int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
354		    mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
355		    bool *is_64_bit __maybe_unused)
356{
357	return -1;
358}
359
360int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
361{
362	return -1;
363}
364
365void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
366{
367}
368
369int kcore_copy(const char *from_dir __maybe_unused,
370	       const char *to_dir __maybe_unused)
371{
372	return -1;
373}
374
375void symbol__elf_init(void)
376{
377}
378
379char *dso__demangle_sym(struct dso *dso __maybe_unused,
380			int kmodule __maybe_unused,
381			const char *elf_name __maybe_unused)
382{
383	return NULL;
384}