Bug Summary

File:ldso/dynlink.c
Location:line 388, column 9
Description:Access to field 'st_info' results in a dereference of a null pointer (loaded from variable 'sym')

Annotated Source Code

1#define _GNU_SOURCE
2#include <stdio.h>
3#include <stdlib.h>
4#include <stdarg.h>
5#include <stddef.h>
6#include <string.h>
7#include <unistd.h>
8#include <stdint.h>
9#include <elf.h>
10#include <sys/mman.h>
11#include <limits.h>
12#include <fcntl.h>
13#include <sys/stat.h>
14#include <errno(*__errno_location()).h>
15#include <link.h>
16#include <setjmpsetjmp.h>
17#include <pthread__pthread.h>
18#include <ctype.h>
19#include <dlfcn.h>
20#include "pthread_impl.h"
21#include "libc.h"
22#include "dynlink.h"
23
24static void error(const char *, ...);
25
26#ifdef SHARED1
27
28#define MAXP2(a,b)(-(-(a)&-(b))) (-(-(a)&-(b)))
29#define ALIGN(x,y)((x)+(y)-1 & -(y)) ((x)+(y)-1 & -(y))
30
31struct debug {
32 int ver;
33 void *head;
34 void (*bp)(void);
35 int state;
36 void *base;
37};
38
39struct td_index {
40 size_t args[2];
41 struct td_index *next;
42};
43
44struct dso {
45#if DL_FDPIC0
46 struct fdpic_loadmap *loadmap;
47#else
48 unsigned char *base;
49#endif
50 char *name;
51 size_t *dynv;
52 struct dso *next, *prev;
53
54 Phdr *phdr;
55 int phnum;
56 size_t phentsize;
57 int refcnt;
58 Sym *syms;
59 uint32_t *hashtab;
60 uint32_t *ghashtab;
61 int16_t *versym;
62 char *strings;
63 unsigned char *map;
64 size_t map_len;
65 dev_t dev;
66 ino_t ino;
67 signed char global;
68 char relocated;
69 char constructed;
70 char kernel_mapped;
71 struct dso **deps, *needed_by;
72 char *rpath_orig, *rpath;
73 void *tls_image;
74 size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
75 size_t relro_start, relro_end;
76 void **new_dtv;
77 unsigned char *new_tls;
78 volatile int new_dtv_idx, new_tls_idx;
79 struct td_index *td_index;
80 struct dso *fini_next;
81 char *shortname;
82#if DL_FDPIC0
83 unsigned char *base;
84#else
85 struct fdpic_loadmap *loadmap;
86#endif
87 struct funcdesc {
88 void *addr;
89 size_t *got;
90 } *funcdescs;
91 size_t *got;
92 char buf[];
93};
94
95struct symdef {
96 Sym *sym;
97 struct dso *dso;
98};
99
100int __init_tp(void *);
101void __init_libc(char **, char *);
102
103const char *__libc_get_version(void);
104
105static struct builtin_tls {
106 char c;
107 struct pthread__pthread pt;
108 void *space[16];
109} builtin_tls[1];
110#define MIN_TLS_ALIGN__builtin_offsetof(struct builtin_tls, pt) offsetof(struct builtin_tls, pt)__builtin_offsetof(struct builtin_tls, pt)
111
112#define ADDEND_LIMIT4096 4096
113static size_t *saved_addends, *apply_addends_to;
114
115static struct dso ldso;
116static struct dso *head, *tail, *fini_head;
117static char *env_path, *sys_path;
118static unsigned long long gencnt;
119static int runtime;
120static int ldd_mode;
121static int ldso_fail;
122static int noload;
123static jmp_buf *rtld_fail;
124static pthread_rwlock_t lock;
125static struct debug debug;
126static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN__builtin_offsetof(struct builtin_tls, pt);
127static size_t static_tls_cnt;
128static pthread_mutex_t init_fini_lock = { ._m_type__u.__i[0] = PTHREAD_MUTEX_RECURSIVE1 };
129static struct fdpic_loadmap *app_loadmap;
130static struct fdpic_dummy_loadmap app_dummy_loadmap;
131
132struct debug *_dl_debug_addr = &debug;
133
134static int dl_strcmp(const char *l, const char *r)
135{
136 for (; *l==*r && *l; l++, r++);
137 return *(unsigned char *)l - *(unsigned char *)r;
138}
139#define strcmp(l,r)dl_strcmp(l,r) dl_strcmp(l,r)
140
141/* Compute load address for a virtual address in a given dso. */
142#if DL_FDPIC0
143static void *laddr(const struct dso *p, size_t v)(void *)((const struct dso *p)->base + (size_t v))
144{
145 size_t j=0;
146 if (!p->loadmap) return p->base + v;
147 for (j=0; v-p->loadmap->segs[j].p_vaddr >= p->loadmap->segs[j].p_memsz; j++);
148 return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr);
149}
150#define fpaddr(p, v)((void (*)())(void *)((p)->base + (v))) ((void (*)())&(struct funcdesc){ \
151 laddr(p, v)(void *)((p)->base + (v)), (p)->got })
152#else
153#define laddr(p, v)(void *)((p)->base + (v)) (void *)((p)->base + (v))
154#define fpaddr(p, v)((void (*)())(void *)((p)->base + (v))) ((void (*)())laddr(p, v)(void *)((p)->base + (v)))
155#endif
156
157static void decode_vec(size_t *v, size_t *a, size_t cnt)
158{
159 size_t i;
160 for (i=0; i<cnt; i++) a[i] = 0;
161 for (; v[0]; v+=2) if (v[0]-1<cnt-1) {
162 a[0] |= 1UL<<v[0];
163 a[v[0]] = v[1];
164 }
165}
166
167static int search_vec(size_t *v, size_t *r, size_t key)
168{
169 for (; v[0]!=key; v+=2)
170 if (!v[0]) return 0;
171 *r = v[1];
172 return 1;
173}
174
175static uint32_t sysv_hash(const char *s0)
176{
177 const unsigned char *s = (void *)s0;
178 uint_fast32_t h = 0;
179 while (*s) {
180 h = 16*h + *s++;
181 h ^= h>>24 & 0xf0;
182 }
183 return h & 0xfffffff;
184}
185
186static uint32_t gnu_hash(const char *s0)
187{
188 const unsigned char *s = (void *)s0;
189 uint_fast32_t h = 5381;
190 for (; *s; s++)
191 h += h*32 + *s;
192 return h;
193}
194
195static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
196{
197 size_t i;
198 Sym *syms = dso->syms;
199 uint32_t *hashtab = dso->hashtab;
200 char *strings = dso->strings;
201 for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
202 if ((!dso->versym || dso->versym[i] >= 0)
203 && (!strcmp(s, strings+syms[i].st_name)dl_strcmp(s,strings+syms[i].st_name)))
204 return syms+i;
205 }
206 return 0;
207}
208
209static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s)
210{
211 uint32_t nbuckets = hashtab[0];
212 uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
213 uint32_t i = buckets[h1 % nbuckets];
214
215 if (!i) return 0;
216
217 uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]);
218
219 for (h1 |= 1; ; i++) {
220 uint32_t h2 = *hashval++;
221 if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0)
222 && !strcmp(s, dso->strings + dso->syms[i].st_name)dl_strcmp(s,dso->strings + dso->syms[i].st_name))
223 return dso->syms+i;
224 if (h2 & 1) break;
225 }
226
227 return 0;
228}
229
230static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask)
231{
232 const size_t *bloomwords = (const void *)(hashtab+4);
233 size_t f = bloomwords[fofs & (hashtab[2]-1)];
234 if (!(f & fmask)) return 0;
235
236 f >>= (h1 >> hashtab[3]) % (8 * sizeof f);
237 if (!(f & 1)) return 0;
238
239 return gnu_lookup(h1, hashtab, dso, s);
240}
241
242#define OK_TYPES(1<<0 | 1<<1 | 1<<2 | 1<<5 | 1<<
6)
(1<<STT_NOTYPE0 | 1<<STT_OBJECT1 | 1<<STT_FUNC2 | 1<<STT_COMMON5 | 1<<STT_TLS6)
243#define OK_BINDS(1<<1 | 1<<2 | 1<<10) (1<<STB_GLOBAL1 | 1<<STB_WEAK2 | 1<<STB_GNU_UNIQUE10)
244
245#ifndef ARCH_SYM_REJECT_UND
246#define ARCH_SYM_REJECT_UND(s)0 0
247#endif
248
249static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
250{
251 uint32_t h = 0, gh, gho, *ght;
252 size_t ghm = 0;
253 struct symdef def = {0};
254 for (; dso; dso=dso->next) {
255 Sym *sym;
256 if (!dso->global) continue;
257 if ((ght = dso->ghashtab)) {
258 if (!ghm) {
259 gh = gnu_hash(s);
260 int maskbits = 8 * sizeof ghm;
261 gho = gh / maskbits;
262 ghm = 1ul << gh % maskbits;
263 }
264 sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm);
265 } else {
266 if (!h) h = sysv_hash(s);
267 sym = sysv_lookup(s, h, dso);
268 }
269 if (!sym) continue;
270 if (!sym->st_shndx)
271 if (need_def || (sym->st_info&0xf) == STT_TLS6
272 || ARCH_SYM_REJECT_UND(sym)0)
273 continue;
274 if (!sym->st_value)
275 if ((sym->st_info&0xf) != STT_TLS6)
276 continue;
277 if (!(1<<(sym->st_info&0xf) & OK_TYPES(1<<0 | 1<<1 | 1<<2 | 1<<5 | 1<<
6)
)) continue;
278 if (!(1<<(sym->st_info>>4) & OK_BINDS(1<<1 | 1<<2 | 1<<10))) continue;
279
280 if (def.sym && sym->st_info>>4 == STB_WEAK2) continue;
281 def.sym = sym;
282 def.dso = dso;
283 if (sym->st_info>>4 == STB_GLOBAL1) break;
284 }
285 return def;
286}
287
288__attribute__((__visibility__("hidden")))
289ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();
290
291static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
292{
293 unsigned char *base = dso->base;
294 Sym *syms = dso->syms;
295 char *strings = dso->strings;
296 Sym *sym;
297 const char *name;
298 void *ctx;
299 int type;
300 int sym_index;
301 struct symdef def;
302 size_t *reloc_addr;
303 size_t sym_val;
304 size_t tls_val;
305 size_t addend;
306 int skip_relative = 0, reuse_addends = 0, save_slot = 0;
307
308 if (dso == &ldso) {
1
Taking false branch
309 /* Only ldso's REL table needs addend saving/reuse. */
310 if (rel == apply_addends_to)
311 reuse_addends = 1;
312 skip_relative = 1;
313 }
314
315 for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
2
Loop condition is true. Entering loop body
20
Loop condition is true. Entering loop body
37
Loop condition is true. Entering loop body
316 if (skip_relative && IS_RELATIVE(rel[1], dso->syms)( (((rel[1])&0x7fffffff) == 8) || (((rel[1])&0x7fffffff
) == REL_SYM_OR_REL && !((rel[1])>>32)) )
) continue;
317 type = R_TYPE(rel[1])((rel[1])&0x7fffffff);
318 if (type == REL_NONE) continue;
3
Assuming 'type' is not equal to REL_NONE
4
Taking false branch
21
Assuming 'type' is not equal to REL_NONE
22
Taking false branch
38
Assuming 'type' is not equal to REL_NONE
39
Taking false branch
319 sym_index = R_SYM(rel[1])((rel[1])>>32);
320 reloc_addr = laddr(dso, rel[0])(void *)((dso)->base + (rel[0]));
321 if (sym_index) {
5
Assuming 'sym_index' is 0
6
Taking false branch
23
Assuming 'sym_index' is 0
24
Taking false branch
40
Assuming 'sym_index' is 0
41
Taking false branch
322 sym = syms + sym_index;
323 name = strings + sym->st_name;
324 ctx = type==REL_COPY5 ? head->next : head;
325 def = (sym->st_info&0xf) == STT_SECTION3
326 ? (struct symdef){ .dso = dso, .sym = sym }
327 : find_sym(ctx, name, type==REL_PLT7);
328 if (!def.sym && (sym->st_shndx != SHN_UNDEF0
329 || sym->st_info>>4 != STB_WEAK2)) {
330 error("Error relocating %s: %s: symbol not found",
331 dso->name, name);
332 if (runtime) longjmp(*rtld_fail, 1);
333 continue;
334 }
335 } else {
336 sym = 0;
42
Null pointer value stored to 'sym'
337 def.sym = 0;
338 def.dso = dso;
339 }
340
341 if (stride > 2) {
7
Assuming 'stride' is <= 2
8
Taking false branch
25
Taking false branch
43
Taking false branch
342 addend = rel[2];
343 } else if (type==REL_GOT6 || type==REL_PLT7|| type==REL_COPY5) {
9
Assuming 'type' is not equal to 6
10
Assuming 'type' is not equal to 7
11
Assuming 'type' is not equal to 5
12
Taking false branch
26
Assuming 'type' is not equal to 6
27
Assuming 'type' is not equal to 7
28
Assuming 'type' is not equal to 5
29
Taking false branch
44
Assuming 'type' is not equal to 6
45
Assuming 'type' is not equal to 7
46
Assuming 'type' is not equal to 5
47
Taking false branch
344 addend = 0;
345 } else if (reuse_addends) {
13
Taking false branch
30
Taking false branch
48
Taking false branch
346 /* Save original addend in stage 2 where the dso
347 * chain consists of just ldso; otherwise read back
348 * saved addend since the inline one was clobbered. */
349 if (head==&ldso)
350 saved_addends[save_slot] = *reloc_addr;
351 addend = saved_addends[save_slot++];
352 } else {
353 addend = *reloc_addr;
354 }
355
356 sym_val = def.sym ? (size_t)laddr(def.dso, def.sym->st_value)(void *)((def.dso)->base + (def.sym->st_value)) : 0;
14
'?' condition is false
31
'?' condition is false
49
'?' condition is false
357 tls_val = def.sym ? def.sym->st_value : 0;
15
'?' condition is false
32
'?' condition is false
50
'?' condition is false
358
359 switch(type) {
16
Control jumps to the 'default' case at line 437
33
Control jumps to the 'default' case at line 437
51
Control jumps to 'case REL_FUNCDESC_VAL:' at line 387
360 case REL_NONE:
361 break;
362 case REL_OFFSET:
363 addend -= (size_t)reloc_addr;
364 case REL_SYMBOLIC1:
365 case REL_GOT6:
366 case REL_PLT7:
367 *reloc_addr = sym_val + addend;
368 break;
369 case REL_RELATIVE8:
370 *reloc_addr = (size_t)base + addend;
371 break;
372 case REL_SYM_OR_REL:
373 if (sym) *reloc_addr = sym_val + addend;
374 else *reloc_addr = (size_t)base + addend;
375 break;
376 case REL_COPY5:
377 memcpy(reloc_addr, (void *)sym_val, sym->st_size);
378 break;
379 case REL_OFFSET322:
380 *(uint32_t *)reloc_addr = sym_val + addend
381 - (size_t)reloc_addr;
382 break;
383 case REL_FUNCDESC:
384 *reloc_addr = def.sym ? (size_t)(def.dso->funcdescs
385 + (def.sym - def.dso->syms)) : 0;
386 break;
387 case REL_FUNCDESC_VAL:
388 if ((sym->st_info&0xf) == STT_SECTION3) *reloc_addr += sym_val;
52
Access to field 'st_info' results in a dereference of a null pointer (loaded from variable 'sym')
389 else *reloc_addr = sym_val;
390 reloc_addr[1] = def.sym ? (size_t)def.dso->got : 0;
391 break;
392 case REL_DTPMOD16:
393 *reloc_addr = def.dso->tls_id;
394 break;
395 case REL_DTPOFF17:
396 *reloc_addr = tls_val + addend - DTP_OFFSET0;
397 break;
398#ifdef TLS_ABOVE_TP
399 case REL_TPOFF18:
400 *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend;
401 break;
402#else
403 case REL_TPOFF18:
404 *reloc_addr = tls_val - def.dso->tls_offset + addend;
405 break;
406 case REL_TPOFF_NEG:
407 *reloc_addr = def.dso->tls_offset - tls_val + addend;
408 break;
409#endif
410 case REL_TLSDESC36:
411 if (stride<3) addend = reloc_addr[1];
412 if (runtime && def.dso->tls_id >= static_tls_cnt) {
413 struct td_index *new = malloc(sizeof *new);
414 if (!new) {
415 error(
416 "Error relocating %s: cannot allocate TLSDESC for %s",
417 dso->name, sym ? name : "(local)" );
418 longjmp(*rtld_fail, 1);
419 }
420 new->next = dso->td_index;
421 dso->td_index = new;
422 new->args[0] = def.dso->tls_id;
423 new->args[1] = tls_val + addend;
424 reloc_addr[0] = (size_t)__tlsdesc_dynamic;
425 reloc_addr[1] = (size_t)new;
426 } else {
427 reloc_addr[0] = (size_t)__tlsdesc_static;
428#ifdef TLS_ABOVE_TP
429 reloc_addr[1] = tls_val + def.dso->tls_offset
430 + TPOFF_K + addend;
431#else
432 reloc_addr[1] = tls_val - def.dso->tls_offset
433 + addend;
434#endif
435 }
436 break;
437 default:
438 error("Error relocating %s: unsupported relocation type %d",
439 dso->name, type);
440 if (runtime) longjmp(*rtld_fail, 1);
17
Assuming 'runtime' is 0
18
Taking false branch
34
Assuming 'runtime' is 0
35
Taking false branch
441 continue;
19
Execution continues on line 315
36
Execution continues on line 315
442 }
443 }
444}
445
446/* A huge hack: to make up for the wastefulness of shared libraries
447 * needing at least a page of dirty memory even if they have no global
448 * data, we reclaim the gaps at the beginning and end of writable maps
449 * and "donate" them to the heap by setting up minimal malloc
450 * structures and then freeing them. */
451
452static void reclaim(struct dso *dso, size_t start, size_t end)
453{
454 size_t *a, *z;
455 if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end;
456 if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start;
457 start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
458 end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
459 if (start>end || end-start < 4*sizeof(size_t)) return;
460 a = laddr(dso, start)(void *)((dso)->base + (start));
461 z = laddr(dso, end)(void *)((dso)->base + (end));
462 a[-2] = 1;
463 a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
464 z[1] = 1;
465 free(a);
466}
467
468static void reclaim_gaps(struct dso *dso)
469{
470 Phdr *ph = dso->phdr;
471 size_t phcnt = dso->phnum;
472
473 if (DL_FDPIC0) return; // FIXME
474 for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) {
475 if (ph->p_type!=PT_LOAD1) continue;
476 if ((ph->p_flags&(PF_R(1 << 2)|PF_W(1 << 1)))!=(PF_R(1 << 2)|PF_W(1 << 1))) continue;
477 reclaim(dso, ph->p_vaddr & -PAGE_SIZE4096, ph->p_vaddr);
478 reclaim(dso, ph->p_vaddr+ph->p_memsz,
479 ph->p_vaddr+ph->p_memsz+PAGE_SIZE4096-1 & -PAGE_SIZE4096);
480 }
481}
482
483static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off)
484{
485 char *q = mmap(p, n, prot, flags, fd, off);
486 if (q != MAP_FAILED((void *) -1) || errno(*__errno_location()) != EINVAL22) return q;
487 /* Fallbacks for MAP_FIXED failure on NOMMU kernels. */
488 if (flags & MAP_ANONYMOUS0x20) {
489 memset(p, 0, n);
490 return p;
491 }
492 ssize_t r;
493 if (lseek(fd, off, SEEK_SET0) < 0) return MAP_FAILED((void *) -1);
494 for (q=p; n; q+=r, off+=r, n-=r) {
495 r = read(fd, q, n);
496 if (r < 0 && errno(*__errno_location()) != EINTR4) return MAP_FAILED((void *) -1);
497 if (!r) {
498 memset(q, 0, n);
499 break;
500 }
501 }
502 return p;
503}
504
505static void unmap_library(struct dso *dso)
506{
507 if (dso->loadmap) {
508 size_t i;
509 for (i=0; i<dso->loadmap->nsegs; i++) {
510 if (!dso->loadmap->segs[i].p_memsz)
511 continue;
512 munmap((void *)dso->loadmap->segs[i].addr,
513 dso->loadmap->segs[i].p_memsz);
514 }
515 free(dso->loadmap);
516 } else if (dso->map && dso->map_len) {
517 munmap(dso->map, dso->map_len);
518 }
519}
520
521static void *map_library(int fd, struct dso *dso)
522{
523 Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
524 void *allocated_buf=0;
525 size_t phsize;
526 size_t addr_min=SIZE_MAX(0xffffffffffffffffu), addr_max=0, map_len;
527 size_t this_min, this_max;
528 size_t nsegs = 0;
529 off_t off_start;
530 Ehdr *eh;
531 Phdr *ph, *ph0;
532 unsigned prot;
533 unsigned char *map=MAP_FAILED((void *) -1), *base;
534 size_t dyn=0;
535 size_t tls_image=0;
536 size_t i;
537
538 ssize_t l = read(fd, buf, sizeof buf);
539 eh = buf;
540 if (l<0) return 0;
541 if (l<sizeof *eh || (eh->e_type != ET_DYN3 && eh->e_type != ET_EXEC2))
542 goto noexec;
543 phsize = eh->e_phentsize * eh->e_phnum;
544 if (phsize > sizeof buf - sizeof *eh) {
545 allocated_buf = malloc(phsize);
546 if (!allocated_buf) return 0;
547 l = pread(fd, allocated_buf, phsize, eh->e_phoff);
548 if (l < 0) goto error;
549 if (l != phsize) goto noexec;
550 ph = ph0 = allocated_buf;
551 } else if (eh->e_phoff + phsize > l) {
552 l = pread(fd, buf+1, phsize, eh->e_phoff);
553 if (l < 0) goto error;
554 if (l != phsize) goto noexec;
555 ph = ph0 = (void *)(buf + 1);
556 } else {
557 ph = ph0 = (void *)((char *)buf + eh->e_phoff);
558 }
559 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
560 if (ph->p_type == PT_DYNAMIC2) {
561 dyn = ph->p_vaddr;
562 } else if (ph->p_type == PT_TLS7) {
563 tls_image = ph->p_vaddr;
564 dso->tls_align = ph->p_align;
565 dso->tls_len = ph->p_filesz;
566 dso->tls_size = ph->p_memsz;
567 } else if (ph->p_type == PT_GNU_RELRO0x6474e552) {
568 dso->relro_start = ph->p_vaddr & -PAGE_SIZE4096;
569 dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE4096;
570 }
571 if (ph->p_type != PT_LOAD1) continue;
572 nsegs++;
573 if (ph->p_vaddr < addr_min) {
574 addr_min = ph->p_vaddr;
575 off_start = ph->p_offset;
576 prot = (((ph->p_flags&PF_R(1 << 2)) ? PROT_READ1 : 0) |
577 ((ph->p_flags&PF_W(1 << 1)) ? PROT_WRITE2: 0) |
578 ((ph->p_flags&PF_X(1 << 0)) ? PROT_EXEC4 : 0));
579 }
580 if (ph->p_vaddr+ph->p_memsz > addr_max) {
581 addr_max = ph->p_vaddr+ph->p_memsz;
582 }
583 }
584 if (!dyn) goto noexec;
585 if (DL_FDPIC0 && !(eh->e_flags & FDPIC_CONSTDISP_FLAG0)) {
586 dso->loadmap = calloc(1, sizeof *dso->loadmap
587 + nsegs * sizeof *dso->loadmap->segs);
588 if (!dso->loadmap) goto error;
589 dso->loadmap->nsegs = nsegs;
590 for (ph=ph0, i=0; i<nsegs; ph=(void *)((char *)ph+eh->e_phentsize)) {
591 if (ph->p_type != PT_LOAD1) continue;
592 prot = (((ph->p_flags&PF_R(1 << 2)) ? PROT_READ1 : 0) |
593 ((ph->p_flags&PF_W(1 << 1)) ? PROT_WRITE2: 0) |
594 ((ph->p_flags&PF_X(1 << 0)) ? PROT_EXEC4 : 0));
595 map = mmap(0, ph->p_memsz + (ph->p_vaddr & PAGE_SIZE4096-1),
596 prot, (prot&PROT_WRITE2) ? MAP_PRIVATE0x02 : MAP_SHARED0x01,
597 fd, ph->p_offset & -PAGE_SIZE4096);
598 if (map == MAP_FAILED((void *) -1)) {
599 unmap_library(dso);
600 goto error;
601 }
602 dso->loadmap->segs[i].addr = (size_t)map +
603 (ph->p_vaddr & PAGE_SIZE4096-1);
604 dso->loadmap->segs[i].p_vaddr = ph->p_vaddr;
605 dso->loadmap->segs[i].p_memsz = ph->p_memsz;
606 i++;
607 }
608 map = (void *)dso->loadmap->segs[0].addr;
609 map_len = 0;
610 goto done_mapping;
611 }
612 addr_max += PAGE_SIZE4096-1;
613 addr_max &= -PAGE_SIZE4096;
614 addr_min &= -PAGE_SIZE4096;
615 off_start &= -PAGE_SIZE4096;
616 map_len = addr_max - addr_min + off_start;
617 /* The first time, we map too much, possibly even more than
618 * the length of the file. This is okay because we will not
619 * use the invalid part; we just need to reserve the right
620 * amount of virtual address space to map over later. */
621 map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE0x02, fd, off_start);
622 if (map==MAP_FAILED((void *) -1)) goto error;
623 dso->map = map;
624 dso->map_len = map_len;
625 /* If the loaded file is not relocatable and the requested address is
626 * not available, then the load operation must fail. */
627 if (eh->e_type != ET_DYN3 && addr_min && map!=(void *)addr_min) {
628 errno(*__errno_location()) = EBUSY16;
629 goto error;
630 }
631 base = map - addr_min;
632 dso->phdr = 0;
633 dso->phnum = 0;
634 for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
635 if (ph->p_type != PT_LOAD1) continue;
636 /* Check if the programs headers are in this load segment, and
637 * if so, record the address for use by dl_iterate_phdr. */
638 if (!dso->phdr && eh->e_phoff >= ph->p_offset
639 && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
640 dso->phdr = (void *)(base + ph->p_vaddr
641 + (eh->e_phoff-ph->p_offset));
642 dso->phnum = eh->e_phnum;
643 dso->phentsize = eh->e_phentsize;
644 }
645 /* Reuse the existing mapping for the lowest-address LOAD */
646 if ((ph->p_vaddr & -PAGE_SIZE4096) == addr_min) continue;
647 this_min = ph->p_vaddr & -PAGE_SIZE4096;
648 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE4096-1 & -PAGE_SIZE4096;
649 off_start = ph->p_offset & -PAGE_SIZE4096;
650 prot = (((ph->p_flags&PF_R(1 << 2)) ? PROT_READ1 : 0) |
651 ((ph->p_flags&PF_W(1 << 1)) ? PROT_WRITE2: 0) |
652 ((ph->p_flags&PF_X(1 << 0)) ? PROT_EXEC4 : 0));
653 if (mmap_fixed(base+this_min, this_max-this_min, prot, MAP_PRIVATE0x02|MAP_FIXED0x10, fd, off_start) == MAP_FAILED((void *) -1))
654 goto error;
655 if (ph->p_memsz > ph->p_filesz) {
656 size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
657 size_t pgbrk = brk+PAGE_SIZE4096-1 & -PAGE_SIZE4096;
658 memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE4096-1);
659 if (pgbrk-(size_t)base < this_max && mmap_fixed((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE0x02|MAP_FIXED0x10|MAP_ANONYMOUS0x20, -1, 0) == MAP_FAILED((void *) -1))
660 goto error;
661 }
662 }
663 for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
664 if (((size_t *)(base+dyn))[i]==DT_TEXTREL22) {
665 if (mprotect(map, map_len, PROT_READ1|PROT_WRITE2|PROT_EXEC4)
666 && errno(*__errno_location()) != ENOSYS38)
667 goto error;
668 break;
669 }
670done_mapping:
671 dso->base = base;
672 dso->dynv = laddr(dso, dyn)(void *)((dso)->base + (dyn));
673 if (dso->tls_size) dso->tls_image = laddr(dso, tls_image)(void *)((dso)->base + (tls_image));
674 if (!runtime) reclaim_gaps(dso);
675 free(allocated_buf);
676 return map;
677noexec:
678 errno(*__errno_location()) = ENOEXEC8;
679error:
680 if (map!=MAP_FAILED((void *) -1)) unmap_library(dso);
681 free(allocated_buf);
682 return 0;
683}
684
685static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
686{
687 size_t l;
688 int fd;
689 for (;;) {
690 s += strspn(s, ":\n");
691 l = strcspn(s, ":\n");
692 if (l-1 >= INT_MAX0x7fffffff) return -1;
693 if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) {
694 if ((fd = open(buf, O_RDONLY00|O_CLOEXEC02000000))>=0) return fd;
695 switch (errno(*__errno_location())) {
696 case ENOENT2:
697 case ENOTDIR20:
698 case EACCES13:
699 case ENAMETOOLONG36:
700 break;
701 default:
702 /* Any negative value but -1 will inhibit
703 * futher path search. */
704 return -2;
705 }
706 }
707 s += l;
708 }
709}
710
711static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
712{
713 size_t n, l;
714 const char *s, *t, *origin;
715 char *d;
716 if (p->rpath || !p->rpath_orig) return 0;
717 if (!strchr(p->rpath_orig, '$')) {
718 p->rpath = p->rpath_orig;
719 return 0;
720 }
721 n = 0;
722 s = p->rpath_orig;
723 while ((t=strchr(s, '$'))) {
724 if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9))
725 return 0;
726 s = t+1;
727 n++;
728 }
729 if (n > SSIZE_MAX0x7fffffffffffffffL/PATH_MAX4096) return 0;
730
731 if (p->kernel_mapped) {
732 /* $ORIGIN searches cannot be performed for the main program
733 * when it is suid/sgid/AT_SECURE. This is because the
734 * pathname is under the control of the caller of execve.
735 * For libraries, however, $ORIGIN can be processed safely
736 * since the library's pathname came from a trusted source
737 * (either system paths or a call to dlopen). */
738 if (libc__libc.secure)
739 return 0;
740 l = readlink("/proc/self/exe", buf, buf_size);
741 if (l == -1) switch (errno(*__errno_location())) {
742 case ENOENT2:
743 case ENOTDIR20:
744 case EACCES13:
745 break;
746 default:
747 return -1;
748 }
749 if (l >= buf_size)
750 return 0;
751 buf[l] = 0;
752 origin = buf;
753 } else {
754 origin = p->name;
755 }
756 t = strrchr(origin, '/');
757 l = t ? t-origin : 0;
758 p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1);
759 if (!p->rpath) return -1;
760
761 d = p->rpath;
762 s = p->rpath_orig;
763 while ((t=strchr(s, '$'))) {
764 memcpy(d, s, t-s);
765 d += t-s;
766 memcpy(d, origin, l);
767 d += l;
768 /* It was determined previously that the '$' is followed
769 * either by "ORIGIN" or "{ORIGIN}". */
770 s = t + 7 + 2*(t[1]=='{');
771 }
772 strcpy(d, s);
773 return 0;
774}
775
776static void decode_dyn(struct dso *p)
777{
778 size_t dyn[DYN_CNT32];
779 decode_vec(p->dynv, dyn, DYN_CNT32);
780 p->syms = laddr(p, dyn[DT_SYMTAB])(void *)((p)->base + (dyn[6]));
781 p->strings = laddr(p, dyn[DT_STRTAB])(void *)((p)->base + (dyn[5]));
782 if (dyn[0]&(1<<DT_HASH4))
783 p->hashtab = laddr(p, dyn[DT_HASH])(void *)((p)->base + (dyn[4]));
784 if (dyn[0]&(1<<DT_RPATH15))
785 p->rpath_orig = p->strings + dyn[DT_RPATH15];
786 if (dyn[0]&(1<<DT_RUNPATH29))
787 p->rpath_orig = p->strings + dyn[DT_RUNPATH29];
788 if (dyn[0]&(1<<DT_PLTGOT3))
789 p->got = laddr(p, dyn[DT_PLTGOT])(void *)((p)->base + (dyn[3]));
790 if (search_vec(p->dynv, dyn, DT_GNU_HASH0x6ffffef5))
791 p->ghashtab = laddr(p, *dyn)(void *)((p)->base + (*dyn));
792 if (search_vec(p->dynv, dyn, DT_VERSYM0x6ffffff0))
793 p->versym = laddr(p, *dyn)(void *)((p)->base + (*dyn));
794}
795
796static size_t count_syms(struct dso *p)
797{
798 if (p->hashtab) return p->hashtab[1];
799
800 size_t nsym, i;
801 uint32_t *buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
802 uint32_t *hashval;
803 for (i = nsym = 0; i < p->ghashtab[0]; i++) {
804 if (buckets[i] > nsym)
805 nsym = buckets[i];
806 }
807 if (nsym) {
808 hashval = buckets + p->ghashtab[0] + (nsym - p->ghashtab[1]);
809 do nsym++;
810 while (!(*hashval++ & 1));
811 }
812 return nsym;
813}
814
815static void *dl_mmap(size_t n)
816{
817 void *p;
818 int prot = PROT_READ1|PROT_WRITE2, flags = MAP_ANONYMOUS0x20|MAP_PRIVATE0x02;
819#ifdef SYS_mmap2
820 p = (void *)__syscall(SYS_mmap2, 0, n, prot, flags, -1, 0)__syscall6(SYS_mmap2,((long) (0)),((long) (n)),((long) (prot)
),((long) (flags)),((long) (-1)),((long) (0)))
;
821#else
822 p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0)__syscall6(9,((long) (0)),((long) (n)),((long) (prot)),((long
) (flags)),((long) (-1)),((long) (0)))
;
823#endif
824 return p == MAP_FAILED((void *) -1) ? 0 : p;
825}
826
827static void makefuncdescs(struct dso *p)
828{
829 static int self_done;
830 size_t nsym = count_syms(p);
831 size_t i, size = nsym * sizeof(*p->funcdescs);
832
833 if (!self_done) {
834 p->funcdescs = dl_mmap(size);
835 self_done = 1;
836 } else {
837 p->funcdescs = malloc(size);
838 }
839 if (!p->funcdescs) {
840 if (!runtime) a_crash();
841 error("Error allocating function descriptors for %s", p->name);
842 longjmp(*rtld_fail, 1);
843 }
844 for (i=0; i<nsym; i++) {
845 if ((p->syms[i].st_info&0xf)==STT_FUNC2 && p->syms[i].st_shndx) {
846 p->funcdescs[i].addr = laddr(p, p->syms[i].st_value)(void *)((p)->base + (p->syms[i].st_value));
847 p->funcdescs[i].got = p->got;
848 } else {
849 p->funcdescs[i].addr = 0;
850 p->funcdescs[i].got = 0;
851 }
852 }
853}
854
855static struct dso *load_library(const char *name, struct dso *needed_by)
856{
857 char buf[2*NAME_MAX255+2];
858 const char *pathname;
859 unsigned char *map;
860 struct dso *p, temp_dso = {0};
861 int fd;
862 struct stat st;
863 size_t alloc_size;
864 int n_th = 0;
865 int is_self = 0;
866
867 if (!*name) {
868 errno(*__errno_location()) = EINVAL22;
869 return 0;
870 }
871
872 /* Catch and block attempts to reload the implementation itself */
873 if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
874 static const char *rp, reserved[] =
875 "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
876 char *z = strchr(name, '.');
877 if (z) {
878 size_t l = z-name;
879 for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1);
880 if (*rp) {
881 if (ldd_mode) {
882 /* Track which names have been resolved
883 * and only report each one once. */
884 static unsigned reported;
885 unsigned mask = 1U<<(rp-reserved);
886 if (!(reported & mask)) {
887 reported |= mask;
888 dprintf(1, "\t%s => %s (%p)\n",
889 name, ldso.name,
890 ldso.base);
891 }
892 }
893 is_self = 1;
894 }
895 }
896 }
897 if (!strcmp(name, ldso.name)dl_strcmp(name,ldso.name)) is_self = 1;
898 if (is_self) {
899 if (!ldso.prev) {
900 tail->next = &ldso;
901 ldso.prev = tail;
902 tail = ldso.next ? ldso.next : &ldso;
903 }
904 return &ldso;
905 }
906 if (strchr(name, '/')) {
907 pathname = name;
908 fd = open(name, O_RDONLY00|O_CLOEXEC02000000);
909 } else {
910 /* Search for the name to see if it's already loaded */
911 for (p=head->next; p; p=p->next) {
912 if (p->shortname && !strcmp(p->shortname, name)dl_strcmp(p->shortname,name)) {
913 p->refcnt++;
914 return p;
915 }
916 }
917 if (strlen(name) > NAME_MAX255) return 0;
918 fd = -1;
919 if (env_path) fd = path_open(name, env_path, buf, sizeof buf);
920 for (p=needed_by; fd == -1 && p; p=p->needed_by) {
921 if (fixup_rpath(p, buf, sizeof buf) < 0)
922 fd = -2; /* Inhibit further search. */
923 if (p->rpath)
924 fd = path_open(name, p->rpath, buf, sizeof buf);
925 }
926 if (fd == -1) {
927 if (!sys_path) {
928 char *prefix = 0;
929 size_t prefix_len;
930 if (ldso.name[0]=='/') {
931 char *s, *t, *z;
932 for (s=t=z=ldso.name; *s; s++)
933 if (*s=='/') z=t, t=s;
934 prefix_len = z-ldso.name;
935 if (prefix_len < PATH_MAX4096)
936 prefix = ldso.name;
937 }
938 if (!prefix) {
939 prefix = "";
940 prefix_len = 0;
941 }
942 char etc_ldso_path[prefix_len + 1
943 + sizeof "/etc/ld-musl-" LDSO_ARCH"x86_64" ".path"];
944 snprintf(etc_ldso_path, sizeof etc_ldso_path,
945 "%.*s/etc/ld-musl-" LDSO_ARCH"x86_64" ".path",
946 (int)prefix_len, prefix);
947 FILE *f = fopen(etc_ldso_path, "rbe");
948 if (f) {
949 if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
950 free(sys_path);
951 sys_path = "";
952 }
953 fclose(f);
954 } else if (errno(*__errno_location()) != ENOENT2) {
955 sys_path = "";
956 }
957 }
958 if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
959 fd = path_open(name, sys_path, buf, sizeof buf);
960 }
961 pathname = buf;
962 }
963 if (fd < 0) return 0;
964 if (fstat(fd, &st) < 0) {
965 close(fd);
966 return 0;
967 }
968 for (p=head->next; p; p=p->next) {
969 if (p->dev == st.st_dev && p->ino == st.st_ino) {
970 /* If this library was previously loaded with a
971 * pathname but a search found the same inode,
972 * setup its shortname so it can be found by name. */
973 if (!p->shortname && pathname != name)
974 p->shortname = strrchr(p->name, '/')+1;
975 close(fd);
976 p->refcnt++;
977 return p;
978 }
979 }
980 map = noload ? 0 : map_library(fd, &temp_dso);
981 close(fd);
982 if (!map) return 0;
983
984 /* Allocate storage for the new DSO. When there is TLS, this
985 * storage must include a reservation for all pre-existing
986 * threads to obtain copies of both the new TLS, and an
987 * extended DTV capable of storing an additional slot for
988 * the newly-loaded DSO. */
989 alloc_size = sizeof *p + strlen(pathname) + 1;
990 if (runtime && temp_dso.tls_image) {
991 size_t per_th = temp_dso.tls_size + temp_dso.tls_align
992 + sizeof(void *) * (tls_cnt+3);
993 n_th = libc__libc.threads_minus_1 + 1;
994 if (n_th > SSIZE_MAX0x7fffffffffffffffL / per_th) alloc_size = SIZE_MAX(0xffffffffffffffffu);
995 else alloc_size += n_th * per_th;
996 }
997 p = calloc(1, alloc_size);
998 if (!p) {
999 unmap_library(&temp_dso);
1000 return 0;
1001 }
1002 memcpy(p, &temp_dso, sizeof temp_dso);
1003 decode_dyn(p);
1004 p->dev = st.st_dev;
1005 p->ino = st.st_ino;
1006 p->refcnt = 1;
1007 p->needed_by = needed_by;
1008 p->name = p->buf;
1009 strcpy(p->name, pathname);
1010 /* Add a shortname only if name arg was not an explicit pathname. */
1011 if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
1012 if (p->tls_image) {
1013 p->tls_id = ++tls_cnt;
1014 tls_align = MAXP2(tls_align, p->tls_align)(-(-(tls_align)&-(p->tls_align)));
1015#ifdef TLS_ABOVE_TP
1016 p->tls_offset = tls_offset + ( (tls_align-1) &
1017 -(tls_offset + (uintptr_t)p->tls_image) );
1018 tls_offset += p->tls_size;
1019#else
1020 tls_offset += p->tls_size + p->tls_align - 1;
1021 tls_offset -= (tls_offset + (uintptr_t)p->tls_image)
1022 & (p->tls_align-1);
1023 p->tls_offset = tls_offset;
1024#endif
1025 p->new_dtv = (void *)(-sizeof(size_t) &
1026 (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
1027 p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
1028 }
1029
1030 tail->next = p;
1031 p->prev = tail;
1032 tail = p;
1033
1034 if (DL_FDPIC0) makefuncdescs(p);
1035
1036 if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);
1037
1038 return p;
1039}
1040
1041static void load_deps(struct dso *p)
1042{
1043 size_t i, ndeps=0;
1044 struct dso ***deps = &p->deps, **tmp, *dep;
1045 for (; p; p=p->next) {
1046 for (i=0; p->dynv[i]; i+=2) {
1047 if (p->dynv[i] != DT_NEEDED1) continue;
1048 dep = load_library(p->strings + p->dynv[i+1], p);
1049 if (!dep) {
1050 error("Error loading shared library %s: %m (needed by %s)",
1051 p->strings + p->dynv[i+1], p->name);
1052 if (runtime) longjmp(*rtld_fail, 1);
1053 continue;
1054 }
1055 if (runtime) {
1056 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
1057 if (!tmp) longjmp(*rtld_fail, 1);
1058 tmp[ndeps++] = dep;
1059 tmp[ndeps] = 0;
1060 *deps = tmp;
1061 }
1062 }
1063 }
1064}
1065
1066static void load_preload(char *s)
1067{
1068 int tmp;
1069 char *z;
1070 for (z=s; *z; s=z) {
1071 for ( ; *s && (isspace(*s)__isspace(*s) || *s==':'); s++);
1072 for (z=s; *z && !isspace(*z)__isspace(*z) && *z!=':'; z++);
1073 tmp = *z;
1074 *z = 0;
1075 load_library(s, 0);
1076 *z = tmp;
1077 }
1078}
1079
1080static void make_global(struct dso *p)
1081{
1082 for (; p; p=p->next) p->global = 1;
1083}
1084
1085static void do_mips_relocs(struct dso *p, size_t *got)
1086{
1087 size_t i, j, rel[2];
1088 unsigned char *base = p->base;
1089 i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO0x7000000a);
1090 if (p==&ldso) {
1091 got += i;
1092 } else {
1093 while (i--) *got++ += (size_t)base;
1094 }
1095 j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM0x70000013);
1096 i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO0x70000011);
1097 Sym *sym = p->syms + j;
1098 rel[0] = (unsigned char *)got - base;
1099 for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) {
1100 rel[1] = sym-p->syms << 8 | R_MIPS_JUMP_SLOT127;
1101 do_relocs(p, rel, sizeof rel, 2);
1102 }
1103}
1104
1105static void reloc_all(struct dso *p)
1106{
1107 size_t dyn[DYN_CNT32];
1108 for (; p; p=p->next) {
1109 if (p->relocated) continue;
1110 decode_vec(p->dynv, dyn, DYN_CNT32);
1111 if (NEED_MIPS_GOT_RELOCS0)
1112 do_mips_relocs(p, laddr(p, dyn[DT_PLTGOT])(void *)((p)->base + (dyn[3])));
1113 do_relocs(p, laddr(p, dyn[DT_JMPREL])(void *)((p)->base + (dyn[23])), dyn[DT_PLTRELSZ2],
1114 2+(dyn[DT_PLTREL20]==DT_RELA7));
1115 do_relocs(p, laddr(p, dyn[DT_REL])(void *)((p)->base + (dyn[17])), dyn[DT_RELSZ18], 2);
1116 do_relocs(p, laddr(p, dyn[DT_RELA])(void *)((p)->base + (dyn[7])), dyn[DT_RELASZ8], 3);
1117
1118 if (head != &ldso && p->relro_start != p->relro_end &&
1119 mprotect(laddr(p, p->relro_start)(void *)((p)->base + (p->relro_start)), p->relro_end-p->relro_start, PROT_READ1)
1120 && errno(*__errno_location()) != ENOSYS38) {
1121 error("Error relocating %s: RELRO protection failed: %m",
1122 p->name);
1123 if (runtime) longjmp(*rtld_fail, 1);
1124 }
1125
1126 p->relocated = 1;
1127 }
1128}
1129
1130static void kernel_mapped_dso(struct dso *p)
1131{
1132 size_t min_addr = -1, max_addr = 0, cnt;
1133 Phdr *ph = p->phdr;
1134 for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) {
1135 if (ph->p_type == PT_DYNAMIC2) {
1136 p->dynv = laddr(p, ph->p_vaddr)(void *)((p)->base + (ph->p_vaddr));
1137 } else if (ph->p_type == PT_GNU_RELRO0x6474e552) {
1138 p->relro_start = ph->p_vaddr & -PAGE_SIZE4096;
1139 p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE4096;
1140 }
1141 if (ph->p_type != PT_LOAD1) continue;
1142 if (ph->p_vaddr < min_addr)
1143 min_addr = ph->p_vaddr;
1144 if (ph->p_vaddr+ph->p_memsz > max_addr)
1145 max_addr = ph->p_vaddr+ph->p_memsz;
1146 }
1147 min_addr &= -PAGE_SIZE4096;
1148 max_addr = (max_addr + PAGE_SIZE4096-1) & -PAGE_SIZE4096;
1149 p->map = p->base + min_addr;
1150 p->map_len = max_addr - min_addr;
1151 p->kernel_mapped = 1;
1152}
1153
1154static void do_fini()
1155{
1156 struct dso *p;
1157 size_t dyn[DYN_CNT32];
1158 for (p=fini_head; p; p=p->fini_next) {
1159 if (!p->constructed) continue;
1160 decode_vec(p->dynv, dyn, DYN_CNT32);
1161 if (dyn[0] & (1<<DT_FINI_ARRAY26)) {
1162 size_t n = dyn[DT_FINI_ARRAYSZ28]/sizeof(size_t);
1163 size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])(void *)((p)->base + (dyn[26]))+n;
1164 while (n--) ((void (*)(void))*--fn)();
1165 }
1166#ifndef NO_LEGACY_INITFINI
1167 if ((dyn[0] & (1<<DT_FINI13)) && dyn[DT_FINI13])
1168 fpaddr(p, dyn[DT_FINI])((void (*)())(void *)((p)->base + (dyn[13])))();
1169#endif
1170 }
1171}
1172
1173static void do_init_fini(struct dso *p)
1174{
1175 size_t dyn[DYN_CNT32];
1176 int need_locking = libc__libc.threads_minus_1;
1177 /* Allow recursive calls that arise when a library calls
1178 * dlopen from one of its constructors, but block any
1179 * other threads until all ctors have finished. */
1180 if (need_locking) pthread_mutex_lock(&init_fini_lock);
1181 for (; p; p=p->prev) {
1182 if (p->constructed) continue;
1183 p->constructed = 1;
1184 decode_vec(p->dynv, dyn, DYN_CNT32);
1185 if (dyn[0] & ((1<<DT_FINI13) | (1<<DT_FINI_ARRAY26))) {
1186 p->fini_next = fini_head;
1187 fini_head = p;
1188 }
1189#ifndef NO_LEGACY_INITFINI
1190 if ((dyn[0] & (1<<DT_INIT12)) && dyn[DT_INIT12])
1191 fpaddr(p, dyn[DT_INIT])((void (*)())(void *)((p)->base + (dyn[12])))();
1192#endif
1193 if (dyn[0] & (1<<DT_INIT_ARRAY25)) {
1194 size_t n = dyn[DT_INIT_ARRAYSZ27]/sizeof(size_t);
1195 size_t *fn = laddr(p, dyn[DT_INIT_ARRAY])(void *)((p)->base + (dyn[25]));
1196 while (n--) ((void (*)(void))*fn++)();
1197 }
1198 if (!need_locking && libc__libc.threads_minus_1) {
1199 need_locking = 1;
1200 pthread_mutex_lock(&init_fini_lock);
1201 }
1202 }
1203 if (need_locking) pthread_mutex_unlock(&init_fini_lock);
1204}
1205
1206void __libc_start_init(void)
1207{
1208 do_init_fini(tail);
1209}
1210
1211static void dl_debug_state(void)
1212{
1213}
1214
1215weak_alias(dl_debug_state, _dl_debug_state)extern __typeof(dl_debug_state) _dl_debug_state __attribute__
((weak, alias("dl_debug_state")))
;
1216
1217void __reset_tls()
1218{
1219 pthread_t self = __pthread_self();
1220 struct dso *p;
1221 for (p=head; p; p=p->next) {
1222 if (!p->tls_id || !self->dtv[p->tls_id]) continue;
1223 memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len);
1224 memset((char *)self->dtv[p->tls_id]+p->tls_len, 0,
1225 p->tls_size - p->tls_len);
1226 if (p->tls_id == (size_t)self->dtv[0]) break;
1227 }
1228}
1229
1230void *__copy_tls(unsigned char *mem)
1231{
1232 pthread_t td;
1233 struct dso *p;
1234 void **dtv;
1235
1236#ifdef TLS_ABOVE_TP
1237 dtv = (void **)(mem + libc__libc.tls_size) - (tls_cnt + 1);
1238
1239 mem += -((uintptr_t)mem + sizeof(struct pthread__pthread)) & (tls_align-1);
1240 td = (pthread_t)mem;
1241 mem += sizeof(struct pthread__pthread);
1242
1243 for (p=head; p; p=p->next) {
1244 if (!p->tls_id) continue;
1245 dtv[p->tls_id] = mem + p->tls_offset;
1246 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
1247 }
1248#else
1249 dtv = (void **)mem;
1250
1251 mem += libc__libc.tls_size - sizeof(struct pthread__pthread);
1252 mem -= (uintptr_t)mem & (tls_align-1);
1253 td = (pthread_t)mem;
1254
1255 for (p=head; p; p=p->next) {
1256 if (!p->tls_id) continue;
1257 dtv[p->tls_id] = mem - p->tls_offset;
1258 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
1259 }
1260#endif
1261 dtv[0] = (void *)tls_cnt;
1262 td->dtv = td->dtv_copy = dtv;
1263 return td;
1264}
1265
1266__attribute__((__visibility__("hidden")))
1267void *__tls_get_new(size_t *v)
1268{
1269 pthread_t self = __pthread_self();
1270
1271 /* Block signals to make accessing new TLS async-signal-safe */
1272 sigset_t set;
1273 __block_all_sigs(&set);
1274 if (v[0]<=(size_t)self->dtv[0]) {
1275 __restore_sigs(&set);
1276 return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET0;
1277 }
1278
1279 /* This is safe without any locks held because, if the caller
1280 * is able to request the Nth entry of the DTV, the DSO list
1281 * must be valid at least that far out and it was synchronized
1282 * at program startup or by an already-completed call to dlopen. */
1283 struct dso *p;
1284 for (p=head; p->tls_id != v[0]; p=p->next);
1285
1286 /* Get new DTV space from new DSO if needed */
1287 if (v[0] > (size_t)self->dtv[0]) {
1288 void **newdtv = p->new_dtv +
1289 (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
1290 memcpy(newdtv, self->dtv,
1291 ((size_t)self->dtv[0]+1) * sizeof(void *));
1292 newdtv[0] = (void *)v[0];
1293 self->dtv = self->dtv_copy = newdtv;
1294 }
1295
1296 /* Get new TLS memory from all new DSOs up to the requested one */
1297 unsigned char *mem;
1298 for (p=head; ; p=p->next) {
1299 if (!p->tls_id || self->dtv[p->tls_id]) continue;
1300 mem = p->new_tls + (p->tls_size + p->tls_align)
1301 * a_fetch_add(&p->new_tls_idx,1);
1302 mem += ((uintptr_t)p->tls_image - (uintptr_t)mem)
1303 & (p->tls_align-1);
1304 self->dtv[p->tls_id] = mem;
1305 memcpy(mem, p->tls_image, p->tls_len);
1306 if (p->tls_id == v[0]) break;
1307 }
1308 __restore_sigs(&set);
1309 return mem + v[1] + DTP_OFFSET0;
1310}
1311
1312static void update_tls_size()
1313{
1314 libc__libc.tls_size = ALIGN((((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
1315 (1+tls_cnt) * sizeof(void *) +(((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
1316 tls_offset +(((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
1317 sizeof(struct pthread) +(((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
1318 tls_align * 2,(((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
1319 tls_align)(((1+tls_cnt) * sizeof(void *) + tls_offset + sizeof(struct __pthread
) + tls_align * 2)+(tls_align)-1 & -(tls_align))
;
1320}
1321
1322/* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the
1323 * following stage 2 and stage 3 functions via primitive symbolic lookup
1324 * since it does not have access to their addresses to begin with. */
1325
1326/* Stage 2 of the dynamic linker is called after relative relocations
1327 * have been processed. It can make function calls to static functions
1328 * and access string literals and static data, but cannot use extern
1329 * symbols. Its job is to perform symbolic relocations on the dynamic
1330 * linker itself, but some of the relocations performed may need to be
1331 * replaced later due to copy relocations in the main program. */
1332
1333void __dls2(unsigned char *base, size_t *sp)
1334{
1335 if (DL_FDPIC0) {
1336 void *p1 = (void *)sp[-2];
1337 void *p2 = (void *)sp[-1];
1338 if (!p1) {
1339 size_t *auxv, aux[AUX_CNT32];
1340 for (auxv=sp+1+*sp+1; *auxv; auxv++); auxv++;
1341 decode_vec(auxv, aux, AUX_CNT32);
1342 if (aux[AT_BASE7]) ldso.base = (void *)aux[AT_BASE7];
1343 else ldso.base = (void *)(aux[AT_PHDR3] & -4096);
1344 }
1345 app_loadmap = p2 ? p1 : 0;
1346 ldso.loadmap = p2 ? p2 : p1;
1347 ldso.base = laddr(&ldso, 0)(void *)((&ldso)->base + (0));
1348 } else {
1349 ldso.base = base;
1350 }
1351 Ehdr *ehdr = (void *)ldso.base;
1352 ldso.name = ldso.shortname = "libc.so";
1353 ldso.global = 1;
1354 ldso.phnum = ehdr->e_phnum;
1355 ldso.phdr = laddr(&ldso, ehdr->e_phoff)(void *)((&ldso)->base + (ehdr->e_phoff));
1356 ldso.phentsize = ehdr->e_phentsize;
1357 kernel_mapped_dso(&ldso);
1358 decode_dyn(&ldso);
1359
1360 if (DL_FDPIC0) makefuncdescs(&ldso);
1361
1362 /* Prepare storage for to save clobbered REL addends so they
1363 * can be reused in stage 3. There should be very few. If
1364 * something goes wrong and there are a huge number, abort
1365 * instead of risking stack overflow. */
1366 size_t dyn[DYN_CNT32];
1367 decode_vec(ldso.dynv, dyn, DYN_CNT32);
1368 size_t *rel = laddr(&ldso, dyn[DT_REL])(void *)((&ldso)->base + (dyn[17]));
1369 size_t rel_size = dyn[DT_RELSZ18];
1370 size_t symbolic_rel_cnt = 0;
1371 apply_addends_to = rel;
1372 for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t))
1373 if (!IS_RELATIVE(rel[1], ldso.syms)( (((rel[1])&0x7fffffff) == 8) || (((rel[1])&0x7fffffff
) == REL_SYM_OR_REL && !((rel[1])>>32)) )
) symbolic_rel_cnt++;
1374 if (symbolic_rel_cnt >= ADDEND_LIMIT4096) a_crash();
1375 size_t addends[symbolic_rel_cnt+1];
1376 saved_addends = addends;
1377
1378 head = &ldso;
1379 reloc_all(&ldso);
1380
1381 ldso.relocated = 0;
1382
1383 /* Call dynamic linker stage-3, __dls3, looking it up
1384 * symbolically as a barrier against moving the address
1385 * load across the above relocation processing. */
1386 struct symdef dls3_def = find_sym(&ldso, "__dls3", 0);
1387 if (DL_FDPIC0) ((stage3_func)&ldso.funcdescs[dls3_def.sym-ldso.syms])(sp);
1388 else ((stage3_func)laddr(&ldso, dls3_def.sym->st_value)(void *)((&ldso)->base + (dls3_def.sym->st_value)))(sp);
1389}
1390
1391/* Stage 3 of the dynamic linker is called with the dynamic linker/libc
1392 * fully functional. Its job is to load (if not already loaded) and
1393 * process dependencies and relocations for the main application and
1394 * transfer control to its entry point. */
1395
1396_Noreturn__attribute__((__noreturn__)) void __dls3(size_t *sp)
1397{
1398 static struct dso app, vdso;
1399 size_t aux[AUX_CNT32], *auxv;
1400 size_t i;
1401 char *env_preload=0;
1402 size_t vdso_base;
1403 int argc = *sp;
1404 char **argv = (void *)(sp+1);
1405 char **argv_orig = argv;
1406 char **envp = argv+argc+1;
1407
1408 /* Find aux vector just past environ[] and use it to initialize
1409 * global data that may be needed before we can make syscalls. */
1410 __environ = envp;
1411 for (i=argc+1; argv[i]; i++);
1412 libc__libc.auxv = auxv = (void *)(argv+i+1);
1413 decode_vec(auxv, aux, AUX_CNT32);
1414 __hwcap = aux[AT_HWCAP16];
1415 libc__libc.page_size = aux[AT_PAGESZ6];
1416 libc__libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID11]!=aux[AT_EUID12]
1417 || aux[AT_GID13]!=aux[AT_EGID14] || aux[AT_SECURE23]);
1418
1419 /* Setup early thread pointer in builtin_tls for ldso/libc itself to
1420 * use during dynamic linking. If possible it will also serve as the
1421 * thread pointer at runtime. */
1422 libc__libc.tls_size = sizeof builtin_tls;
1423 if (__init_tp(__copy_tls((void *)builtin_tls)) < 0) {
1424 a_crash();
1425 }
1426
1427 /* Only trust user/env if kernel says we're not suid/sgid */
1428 if (!libc__libc.secure) {
1429 env_path = getenv("LD_LIBRARY_PATH");
1430 env_preload = getenv("LD_PRELOAD");
1431 }
1432
1433 /* If the main program was already loaded by the kernel,
1434 * AT_PHDR will point to some location other than the dynamic
1435 * linker's program headers. */
1436 if (aux[AT_PHDR3] != (size_t)ldso.phdr) {
1437 size_t interp_off = 0;
1438 size_t tls_image = 0;
1439 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
1440 Phdr *phdr = app.phdr = (void *)aux[AT_PHDR3];
1441 app.phnum = aux[AT_PHNUM5];
1442 app.phentsize = aux[AT_PHENT4];
1443 for (i=aux[AT_PHNUM5]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT4])) {
1444 if (phdr->p_type == PT_PHDR6)
1445 app.base = (void *)(aux[AT_PHDR3] - phdr->p_vaddr);
1446 else if (phdr->p_type == PT_INTERP3)
1447 interp_off = (size_t)phdr->p_vaddr;
1448 else if (phdr->p_type == PT_TLS7) {
1449 tls_image = phdr->p_vaddr;
1450 app.tls_len = phdr->p_filesz;
1451 app.tls_size = phdr->p_memsz;
1452 app.tls_align = phdr->p_align;
1453 }
1454 }
1455 if (DL_FDPIC0) app.loadmap = app_loadmap;
1456 if (app.tls_size) app.tls_image = laddr(&app, tls_image)(void *)((&app)->base + (tls_image));
1457 if (interp_off) ldso.name = laddr(&app, interp_off)(void *)((&app)->base + (interp_off));
1458 if ((aux[0] & (1UL<<AT_EXECFN31))
1459 && strncmp((char *)aux[AT_EXECFN31], "/proc/", 6))
1460 app.name = (char *)aux[AT_EXECFN31];
1461 else
1462 app.name = argv[0];
1463 kernel_mapped_dso(&app);
1464 } else {
1465 int fd;
1466 char *ldname = argv[0];
1467 size_t l = strlen(ldname);
1468 if (l >= 3 && !strcmp(ldname+l-3, "ldd")dl_strcmp(ldname+l-3,"ldd")) ldd_mode = 1;
1469 argv++;
1470 while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') {
1471 char *opt = argv[0]+2;
1472 *argv++ = (void *)-1;
1473 if (!*opt) {
1474 break;
1475 } else if (!memcmp(opt, "list", 5)) {
1476 ldd_mode = 1;
1477 } else if (!memcmp(opt, "library-path", 12)) {
1478 if (opt[12]=='=') env_path = opt+13;
1479 else if (opt[12]) *argv = 0;
1480 else if (*argv) env_path = *argv++;
1481 } else if (!memcmp(opt, "preload", 7)) {
1482 if (opt[7]=='=') env_preload = opt+8;
1483 else if (opt[7]) *argv = 0;
1484 else if (*argv) env_preload = *argv++;
1485 } else {
1486 argv[0] = 0;
1487 }
1488 }
1489 argv[-1] = (void *)(argc - (argv-argv_orig));
1490 if (!argv[0]) {
1491 dprintf(2, "musl libc\n"
1492 "Version %s\n"
1493 "Dynamic Program Loader\n"
1494 "Usage: %s [options] [--] pathname%s\n",
1495 __libc_get_version(), ldname,
1496 ldd_mode ? "" : " [args]");
1497 _exit(1);
1498 }
1499 fd = open(argv[0], O_RDONLY00);
1500 if (fd < 0) {
1501 dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno(*__errno_location())));
1502 _exit(1);
1503 }
1504 runtime = 1;
1505 Ehdr *ehdr = (void *)map_library(fd, &app);
1506 if (!ehdr) {
1507 dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
1508 _exit(1);
1509 }
1510 runtime = 0;
1511 close(fd);
1512 ldso.name = ldname;
1513 app.name = argv[0];
1514 aux[AT_ENTRY9] = (size_t)laddr(&app, ehdr->e_entry)(void *)((&app)->base + (ehdr->e_entry));
1515 /* Find the name that would have been used for the dynamic
1516 * linker had ldd not taken its place. */
1517 if (ldd_mode) {
1518 for (i=0; i<app.phnum; i++) {
1519 if (app.phdr[i].p_type == PT_INTERP3)
1520 ldso.name = laddr(&app, app.phdr[i].p_vaddr)(void *)((&app)->base + (app.phdr[i].p_vaddr));
1521 }
1522 dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base);
1523 }
1524 }
1525 if (app.tls_size) {
1526 app.tls_id = tls_cnt = 1;
1527#ifdef TLS_ABOVE_TP
1528 app.tls_offset = 0;
1529 tls_offset = app.tls_size
1530 + ( -((uintptr_t)app.tls_image + app.tls_size)
1531 & (app.tls_align-1) );
1532#else
1533 tls_offset = app.tls_offset = app.tls_size
1534 + ( -((uintptr_t)app.tls_image + app.tls_size)
1535 & (app.tls_align-1) );
1536#endif
1537 tls_align = MAXP2(tls_align, app.tls_align)(-(-(tls_align)&-(app.tls_align)));
1538 }
1539 app.global = 1;
1540 decode_dyn(&app);
1541 if (DL_FDPIC0) {
1542 makefuncdescs(&app);
1543 if (!app.loadmap) {
1544 app.loadmap = (void *)&app_dummy_loadmap;
1545 app.loadmap->nsegs = 1;
1546 app.loadmap->segs[0].addr = (size_t)app.map;
1547 app.loadmap->segs[0].p_vaddr = (size_t)app.map
1548 - (size_t)app.base;
1549 app.loadmap->segs[0].p_memsz = app.map_len;
1550 }
1551 argv[-3] = (void *)app.loadmap;
1552 }
1553
1554 /* Attach to vdso, if provided by the kernel */
1555 if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR33)) {
1556 Ehdr *ehdr = (void *)vdso_base;
1557 Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff);
1558 vdso.phnum = ehdr->e_phnum;
1559 vdso.phentsize = ehdr->e_phentsize;
1560 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
1561 if (phdr->p_type == PT_DYNAMIC2)
1562 vdso.dynv = (void *)(vdso_base + phdr->p_offset);
1563 if (phdr->p_type == PT_LOAD1)
1564 vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
1565 }
1566 vdso.name = "";
1567 vdso.shortname = "linux-gate.so.1";
1568 vdso.global = 1;
1569 vdso.relocated = 1;
1570 decode_dyn(&vdso);
1571 vdso.prev = &ldso;
1572 ldso.next = &vdso;
1573 }
1574
1575 /* Initial dso chain consists only of the app. */
1576 head = tail = &app;
1577
1578 /* Donate unused parts of app and library mapping to malloc */
1579 reclaim_gaps(&app);
1580 reclaim_gaps(&ldso);
1581
1582 /* Load preload/needed libraries, add their symbols to the global
1583 * namespace, and perform all remaining relocations. */
1584 if (env_preload) load_preload(env_preload);
1585 load_deps(&app);
1586 make_global(&app);
1587
1588#ifndef DYNAMIC_IS_RO
1589 for (i=0; app.dynv[i]; i+=2)
1590 if (app.dynv[i]==DT_DEBUG21)
1591 app.dynv[i+1] = (size_t)&debug;
1592#endif
1593
1594 /* The main program must be relocated LAST since it may contin
1595 * copy relocations which depend on libraries' relocations. */
1596 reloc_all(app.next);
1597 reloc_all(&app);
1598
1599 update_tls_size();
1600 if (libc__libc.tls_size > sizeof builtin_tls || tls_align > MIN_TLS_ALIGN__builtin_offsetof(struct builtin_tls, pt)) {
1601 void *initial_tls = calloc(libc__libc.tls_size, 1);
1602 if (!initial_tls) {
1603 dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
1604 argv[0], libc__libc.tls_size);
1605 _exit(127);
1606 }
1607 if (__init_tp(__copy_tls(initial_tls)) < 0) {
1608 a_crash();
1609 }
1610 } else {
1611 size_t tmp_tls_size = libc__libc.tls_size;
1612 pthread_t self = __pthread_self();
1613 /* Temporarily set the tls size to the full size of
1614 * builtin_tls so that __copy_tls will use the same layout
1615 * as it did for before. Then check, just to be safe. */
1616 libc__libc.tls_size = sizeof builtin_tls;
1617 if (__copy_tls((void*)builtin_tls) != self) a_crash();
1618 libc__libc.tls_size = tmp_tls_size;
1619 }
1620 static_tls_cnt = tls_cnt;
1621
1622 if (ldso_fail) _exit(127);
1623 if (ldd_mode) _exit(0);
1624
1625 /* Switch to runtime mode: any further failures in the dynamic
1626 * linker are a reportable failure rather than a fatal startup
1627 * error. */
1628 runtime = 1;
1629
1630 debug.ver = 1;
1631 debug.bp = dl_debug_state;
1632 debug.head = head;
1633 debug.base = ldso.base;
1634 debug.state = 0;
1635 _dl_debug_state();
1636
1637 __init_libc(envp, argv[0]);
1638 atexit(do_fini);
1639 errno(*__errno_location()) = 0;
1640
1641 CRTJMP((void *)aux[AT_ENTRY], argv-1)__asm__ __volatile__( "mov %1,%%rsp ; jmp *%0" : : "r"((void *
)aux[9]), "r"(argv-1) : "memory" )
;
1642 for(;;);
1643}
1644
1645void *dlopen(const char *file, int mode)
1646{
1647 struct dso *volatile p, *orig_tail, *next;
1648 size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
1649 size_t i;
1650 int cs;
1651 jmp_buf jb;
1652
1653 if (!file) return head;
1654
1655 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE1, &cs);
1656 pthread_rwlock_wrlock(&lock);
1657 __inhibit_ptc();
1658
1659 p = 0;
1660 orig_tls_cnt = tls_cnt;
1661 orig_tls_offset = tls_offset;
1662 orig_tls_align = tls_align;
1663 orig_tail = tail;
1664 noload = mode & RTLD_NOLOAD4;
1665
1666 rtld_fail = &jb;
1667 if (setjmpsetjmp(*rtld_fail)) {
1668 /* Clean up anything new that was (partially) loaded */
1669 if (p && p->deps) for (i=0; p->deps[i]; i++)
1670 if (p->deps[i]->global < 0)
1671 p->deps[i]->global = 0;
1672 for (p=orig_tail->next; p; p=next) {
1673 next = p->next;
1674 while (p->td_index) {
1675 void *tmp = p->td_index->next;
1676 free(p->td_index);
1677 p->td_index = tmp;
1678 }
1679 free(p->funcdescs);
1680 if (p->rpath != p->rpath_orig)
1681 free(p->rpath);
1682 free(p->deps);
1683 unmap_library(p);
1684 free(p);
1685 }
1686 tls_cnt = orig_tls_cnt;
1687 tls_offset = orig_tls_offset;
1688 tls_align = orig_tls_align;
1689 tail = orig_tail;
1690 tail->next = 0;
1691 p = 0;
1692 goto end;
1693 } else p = load_library(file, head);
1694
1695 if (!p) {
1696 error(noload ?
1697 "Library %s is not already loaded" :
1698 "Error loading shared library %s: %m",
1699 file);
1700 goto end;
1701 }
1702
1703 /* First load handling */
1704 if (!p->deps) {
1705 load_deps(p);
1706 if (p->deps) for (i=0; p->deps[i]; i++)
1707 if (!p->deps[i]->global)
1708 p->deps[i]->global = -1;
1709 if (!p->global) p->global = -1;
1710 reloc_all(p);
1711 if (p->deps) for (i=0; p->deps[i]; i++)
1712 if (p->deps[i]->global < 0)
1713 p->deps[i]->global = 0;
1714 if (p->global < 0) p->global = 0;
1715 }
1716
1717 if (mode & RTLD_GLOBAL256) {
1718 if (p->deps) for (i=0; p->deps[i]; i++)
1719 p->deps[i]->global = 1;
1720 p->global = 1;
1721 }
1722
1723 update_tls_size();
1724 _dl_debug_state();
1725 orig_tail = tail;
1726end:
1727 __release_ptc();
1728 if (p) gencnt++;
1729 pthread_rwlock_unlock(&lock);
1730 if (p) do_init_fini(orig_tail);
1731 pthread_setcancelstate(cs, 0);
1732 return p;
1733}
1734
1735static int invalid_dso_handle(void *h)
1736{
1737 struct dso *p;
1738 for (p=head; p; p=p->next) if (h==p) return 0;
1739 error("Invalid library handle %p", (void *)h);
1740 return 1;
1741}
1742
1743static void *addr2dso(size_t a)
1744{
1745 struct dso *p;
1746 for (p=head; p; p=p->next) {
1747 if (DL_FDPIC0 && p->loadmap) {
1748 size_t i;
1749 for (i=0; i<p->loadmap->nsegs; i++) {
1750 if (a-p->loadmap->segs[i].p_vaddr
1751 < p->loadmap->segs[i].p_memsz)
1752 return p;
1753 }
1754 i = count_syms(p);
1755 if (a-(size_t)p->funcdescs < i*sizeof(*p->funcdescs))
1756 return p;
1757 } else {
1758 if (a-(size_t)p->map < p->map_len)
1759 return p;
1760 }
1761 }
1762 return 0;
1763}
1764
1765void *__tls_get_addr(size_t *);
1766
1767static void *do_dlsym(struct dso *p, const char *s, void *ra)
1768{
1769 size_t i;
1770 uint32_t h = 0, gh = 0, *ght;
1771 Sym *sym;
1772 if (p == head || p == RTLD_DEFAULT((void *)0) || p == RTLD_NEXT((void *)-1)) {
1773 if (p == RTLD_DEFAULT((void *)0)) {
1774 p = head;
1775 } else if (p == RTLD_NEXT((void *)-1)) {
1776 p = addr2dso((size_t)ra);
1777 if (!p) p=head;
1778 p = p->next;
1779 }
1780 struct symdef def = find_sym(p, s, 0);
1781 if (!def.sym) goto failed;
1782 if ((def.sym->st_info&0xf) == STT_TLS6)
1783 return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
1784 if (DL_FDPIC0 && (def.sym->st_info&0xf) == STT_FUNC2)
1785 return def.dso->funcdescs + (def.sym - def.dso->syms);
1786 return laddr(def.dso, def.sym->st_value)(void *)((def.dso)->base + (def.sym->st_value));
1787 }
1788 if (invalid_dso_handle(p))
1789 return 0;
1790 if ((ght = p->ghashtab)) {
1791 gh = gnu_hash(s);
1792 sym = gnu_lookup(gh, ght, p, s);
1793 } else {
1794 h = sysv_hash(s);
1795 sym = sysv_lookup(s, h, p);
1796 }
1797 if (sym && (sym->st_info&0xf) == STT_TLS6)
1798 return __tls_get_addr((size_t []){p->tls_id, sym->st_value});
1799 if (DL_FDPIC0 && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC2)
1800 return p->funcdescs + (sym - p->syms);
1801 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES(1<<0 | 1<<1 | 1<<2 | 1<<5 | 1<<
6)
))
1802 return laddr(p, sym->st_value)(void *)((p)->base + (sym->st_value));
1803 if (p->deps) for (i=0; p->deps[i]; i++) {
1804 if ((ght = p->deps[i]->ghashtab)) {
1805 if (!gh) gh = gnu_hash(s);
1806 sym = gnu_lookup(gh, ght, p->deps[i], s);
1807 } else {
1808 if (!h) h = sysv_hash(s);
1809 sym = sysv_lookup(s, h, p->deps[i]);
1810 }
1811 if (sym && (sym->st_info&0xf) == STT_TLS6)
1812 return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value});
1813 if (DL_FDPIC0 && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC2)
1814 return p->deps[i]->funcdescs + (sym - p->deps[i]->syms);
1815 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES(1<<0 | 1<<1 | 1<<2 | 1<<5 | 1<<
6)
))
1816 return laddr(p->deps[i], sym->st_value)(void *)((p->deps[i])->base + (sym->st_value));
1817 }
1818failed:
1819 error("Symbol not found: %s", s);
1820 return 0;
1821}
1822
1823int __dladdr(const void *addr, Dl_info *info)
1824{
1825 struct dso *p;
1826 Sym *sym;
1827 uint32_t nsym;
1828 char *strings;
1829 void *best = 0;
1830 char *bestname;
1831
1832 pthread_rwlock_rdlock(&lock);
1833 p = addr2dso((size_t)addr);
1834 pthread_rwlock_unlock(&lock);
1835
1836 if (!p) return 0;
1837
1838 sym = p->syms;
1839 strings = p->strings;
1840 nsym = count_syms(p);
1841
1842 for (; nsym; nsym--, sym++) {
1843 if (sym->st_value
1844 && (1<<(sym->st_info&0xf) & OK_TYPES(1<<0 | 1<<1 | 1<<2 | 1<<5 | 1<<
6)
)
1845 && (1<<(sym->st_info>>4) & OK_BINDS(1<<1 | 1<<2 | 1<<10))) {
1846 void *symaddr = laddr(p, sym->st_value)(void *)((p)->base + (sym->st_value));
1847 if (symaddr > addr || symaddr < best)
1848 continue;
1849 best = symaddr;
1850 bestname = strings + sym->st_name;
1851 if (addr == symaddr)
1852 break;
1853 }
1854 }
1855
1856 if (!best) return 0;
1857
1858 info->dli_fname = p->name;
1859 info->dli_fbase = p->base;
1860 info->dli_sname = bestname;
1861 info->dli_saddr = best;
1862
1863 return 1;
1864}
1865
1866__attribute__((__visibility__("hidden")))
1867void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1868{
1869 void *res;
1870 pthread_rwlock_rdlock(&lock);
1871 res = do_dlsym(p, s, ra);
1872 pthread_rwlock_unlock(&lock);
1873 return res;
1874}
1875
1876int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
1877{
1878 struct dso *current;
1879 struct dl_phdr_info info;
1880 int ret = 0;
1881 for(current = head; current;) {
1882 info.dlpi_addr = (uintptr_t)current->base;
1883 info.dlpi_name = current->name;
1884 info.dlpi_phdr = current->phdr;
1885 info.dlpi_phnum = current->phnum;
1886 info.dlpi_adds = gencnt;
1887 info.dlpi_subs = 0;
1888 info.dlpi_tls_modid = current->tls_id;
1889 info.dlpi_tls_data = current->tls_image;
1890
1891 ret = (callback)(&info, sizeof (info), data);
1892
1893 if (ret != 0) break;
1894
1895 pthread_rwlock_rdlock(&lock);
1896 current = current->next;
1897 pthread_rwlock_unlock(&lock);
1898 }
1899 return ret;
1900}
1901#else
1902static int invalid_dso_handle(void *h)
1903{
1904 error("Invalid library handle %p", (void *)h);
1905 return 1;
1906}
1907void *dlopen(const char *file, int mode)
1908{
1909 error("Dynamic loading not supported");
1910 return 0;
1911}
1912void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1913{
1914 error("Symbol not found: %s", s);
1915 return 0;
1916}
1917int __dladdr (const void *addr, Dl_info *info)
1918{
1919 return 0;
1920}
1921#endif
1922
1923int __dlinfo(void *dso, int req, void *res)
1924{
1925 if (invalid_dso_handle(dso)) return -1;
1926 if (req != RTLD_DI_LINKMAP2) {
1927 error("Unsupported request %d", req);
1928 return -1;
1929 }
1930 *(struct link_map **)res = dso;
1931 return 0;
1932}
1933
1934char *dlerror()
1935{
1936 pthread_t self = __pthread_self();
1937 if (!self->dlerror_flag) return 0;
1938 self->dlerror_flag = 0;
1939 char *s = self->dlerror_buf;
1940 if (s == (void *)-1)
1941 return "Dynamic linker failed to allocate memory for error message";
1942 else
1943 return s;
1944}
1945
1946int dlclose(void *p)
1947{
1948 return invalid_dso_handle(p);
1949}
1950
1951void __dl_thread_cleanup(void)
1952{
1953 pthread_t self = __pthread_self();
1954 if (self->dlerror_buf != (void *)-1)
1955 free(self->dlerror_buf);
1956}
1957
1958static void error(const char *fmt, ...)
1959{
1960 va_list ap;
1961 va_start(ap, fmt)__builtin_va_start(ap,fmt);
1962#ifdef SHARED1
1963 if (!runtime) {
1964 vdprintf(2, fmt, ap);
1965 dprintf(2, "\n");
1966 ldso_fail = 1;
1967 va_end(ap)__builtin_va_end(ap);
1968 return;
1969 }
1970#endif
1971 pthread_t self = __pthread_self();
1972 if (self->dlerror_buf != (void *)-1)
1973 free(self->dlerror_buf);
1974 size_t len = vsnprintf(0, 0, fmt, ap);
1975 va_end(ap)__builtin_va_end(ap);
1976 char *buf = malloc(len+1);
1977 if (buf) {
1978 va_start(ap, fmt)__builtin_va_start(ap,fmt);
1979 vsnprintf(buf, len+1, fmt, ap);
1980 va_end(ap)__builtin_va_end(ap);
1981 } else {
1982 buf = (void *)-1;
1983 }
1984 self->dlerror_buf = buf;
1985 self->dlerror_flag = 1;
1986}