nsz Git - musl/blob - src/ldso/dynlink.c

   1 #define _GNU_SOURCE
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <stdint.h>
   7 #include <elf.h>
   8 #include <sys/mman.h>
   9 #include <limits.h>
  10 #include <stdint.h>
  11 #include <fcntl.h>
  12 #include <sys/stat.h>
  13 #include <errno.h>
  14 #include <limits.h>
  15 #include <elf.h>
  16 #include <link.h>
  17 #include <setjmp.h>
  18 #include <pthread.h>
  19 #include <ctype.h>
  20 #include <dlfcn.h>
  21 #include "pthread_impl.h"
  22 #include "libc.h"
  23
  24 static int errflag;
  25 static char errbuf[128];
  26
  27 #ifdef SHARED
  28
  29 #if ULONG_MAX == 0xffffffff
  30 typedef Elf32_Ehdr Ehdr;
  31 typedef Elf32_Phdr Phdr;
  32 typedef Elf32_Sym Sym;
  33 #define R_TYPE(x) ((x)&255)
  34 #define R_SYM(x) ((x)>>8)
  35 #else
  36 typedef Elf64_Ehdr Ehdr;
  37 typedef Elf64_Phdr Phdr;
  38 typedef Elf64_Sym Sym;
  39 #define R_TYPE(x) ((x)&0xffffffff)
  40 #define R_SYM(x) ((x)>>32)
  41 #endif
  42
  43 #define MAXP2(a,b) (-(-(a)&-(b)))
  44 #define ALIGN(x,y) ((x)+(y)-1 & -(y))
  45
  46 struct debug {
  47         int ver;
  48         void *head;
  49         void (*bp)(void);
  50         int state;
  51         void *base;
  52 };
  53
  54 struct dso {
  55         unsigned char *base;
  56         char *name;
  57         size_t *dynv;
  58         struct dso *next, *prev;
  59
  60         Phdr *phdr;
  61         int phnum;
  62         int refcnt;
  63         Sym *syms;
  64         uint32_t *hashtab;
  65         uint32_t *ghashtab;
  66         char *strings;
  67         unsigned char *map;
  68         size_t map_len;
  69         dev_t dev;
  70         ino_t ino;
  71         signed char global;
  72         char relocated;
  73         char constructed;
  74         struct dso **deps;
  75         void *tls_image;
  76         size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
  77         void **new_dtv;
  78         unsigned char *new_tls;
  79         int new_dtv_idx, new_tls_idx;
  80         struct dso *fini_next;
  81         char *shortname;
  82         char buf[];
  83 };
  84
  85 struct symdef {
  86         Sym *sym;
  87         struct dso *dso;
  88 };
  89
  90 #include "reloc.h"
  91
  92 void __init_ssp(size_t *);
  93 void *__install_initial_tls(void *);
  94 void __init_libc(char **, char *);
  95
  96 static struct dso *head, *tail, *ldso, *fini_head;
  97 static char *env_path, *sys_path, *r_path;
  98 static unsigned long long gencnt;
  99 static int ssp_used;
 100 static int runtime;
 101 static int ldd_mode;
 102 static int ldso_fail;
 103 static int noload;
 104 static jmp_buf *rtld_fail;
 105 static pthread_rwlock_t lock;
 106 static struct debug debug;
 107 static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t);
 108 static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
 109
 110 struct debug *_dl_debug_addr = &debug;
 111
 112 #define AUX_CNT 38
 113 #define DYN_CNT 34
 114
 115 static void decode_vec(size_t *v, size_t *a, size_t cnt)
 116 {
 117         memset(a, 0, cnt*sizeof(size_t));
 118         for (; v[0]; v+=2) if (v[0]<cnt) {
 119                 a[0] |= 1ULL<<v[0];
 120                 a[v[0]] = v[1];
 121         }
 122 }
 123
 124 static int search_vec(size_t *v, size_t *r, size_t key)
 125 {
 126         for (; v[0]!=key; v+=2)
 127                 if (!v[0]) return 0;
 128         *r = v[1];
 129         return 1;
 130 }
 131
 132 static uint32_t sysv_hash(const char *s0)
 133 {
 134         const unsigned char *s = (void *)s0;
 135         uint_fast32_t h = 0;
 136         while (*s) {
 137                 h = 16*h + *s++;
 138                 h ^= h>>24 & 0xf0;
 139         }
 140         return h & 0xfffffff;
 141 }
 142
 143 static uint32_t gnu_hash(const char *s0)
 144 {
 145         const unsigned char *s = (void *)s0;
 146         uint_fast32_t h = 5381;
 147         for (; *s; s++)
 148                 h = h*33 + *s;
 149         return h;
 150 }
 151
 152 static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
 153 {
 154         size_t i;
 155         Sym *syms = dso->syms;
 156         uint32_t *hashtab = dso->hashtab;
 157         char *strings = dso->strings;
 158         for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
 159                 if (!strcmp(s, strings+syms[i].st_name))
 160                         return syms+i;
 161         }
 162         return 0;
 163 }
 164
 165 static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
 166 {
 167         Sym *sym;
 168         char *strings;
 169         uint32_t *hashtab = dso->ghashtab;
 170         uint32_t nbuckets = hashtab[0];
 171         uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
 172         uint32_t h2;
 173         uint32_t *hashval;
 174         uint32_t n = buckets[h1 % nbuckets];
 175
 176         if (!n) return 0;
 177
 178         strings = dso->strings;
 179         sym = dso->syms + n;
 180         hashval = buckets + nbuckets + (n - hashtab[1]);
 181
 182         for (h1 |= 1; ; sym++) {
 183                 h2 = *hashval++;
 184                 if ((h1 == (h2|1)) && !strcmp(s, strings + sym->st_name))
 185                         return sym;
 186                 if (h2 & 1) break;
 187         }
 188
 189         return 0;
 190 }
 191
 192 #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
 193 #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)
 194
 195 static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
 196 {
 197         uint32_t h = 0, gh = 0;
 198         struct symdef def = {0};
 199         if (dso->ghashtab) {
 200                 gh = gnu_hash(s);
 201                 if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
 202         } else {
 203                 h = sysv_hash(s);
 204                 if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1;
 205         }
 206         for (; dso; dso=dso->next) {
 207                 Sym *sym;
 208                 if (!dso->global) continue;
 209                 if (dso->ghashtab) {
 210                         if (!gh) gh = gnu_hash(s);
 211                         sym = gnu_lookup(s, gh, dso);
 212                 } else {
 213                         if (!h) h = sysv_hash(s);
 214                         sym = sysv_lookup(s, h, dso);
 215                 }
 216                 if (!sym) continue;
 217                 if (!sym->st_shndx)
 218                         if (need_def || (sym->st_info&0xf) == STT_TLS)
 219                                 continue;
 220                 if (!sym->st_value)
 221                         if ((sym->st_info&0xf) != STT_TLS)
 222                                 continue;
 223                 if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
 224                 if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
 225
 226                 if (def.sym && sym->st_info>>4 == STB_WEAK) continue;
 227                 def.sym = sym;
 228                 def.dso = dso;
 229                 if (sym->st_info>>4 == STB_GLOBAL) break;
 230         }
 231         return def;
 232 }
 233
 234 static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
 235 {
 236         unsigned char *base = dso->base;
 237         Sym *syms = dso->syms;
 238         char *strings = dso->strings;
 239         Sym *sym;
 240         const char *name;
 241         void *ctx;
 242         int type;
 243         int sym_index;
 244         struct symdef def;
 245
 246         for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
 247                 type = R_TYPE(rel[1]);
 248                 sym_index = R_SYM(rel[1]);
 249                 if (sym_index) {
 250                         sym = syms + sym_index;
 251                         name = strings + sym->st_name;
 252                         ctx = IS_COPY(type) ? head->next : head;
 253                         def = find_sym(ctx, name, IS_PLT(type));
 254                         if (!def.sym && sym->st_info>>4 != STB_WEAK) {
 255                                 snprintf(errbuf, sizeof errbuf,
 256                                         "Error relocating %s: %s: symbol not found",
 257                                         dso->name, name);
 258                                 if (runtime) longjmp(*rtld_fail, 1);
 259                                 dprintf(2, "%s\n", errbuf);
 260                                 ldso_fail = 1;
 261                                 continue;
 262                         }
 263                 } else {
 264                         sym = 0;
 265                         def.sym = 0;
 266                         def.dso = 0;
 267                 }
 268                 do_single_reloc(dso, base, (void *)(base + rel[0]), type,
 269                         stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def,
 270                         def.sym?(size_t)(def.dso->base+def.sym->st_value):0);
 271         }
 272 }
 273
 274 /* A huge hack: to make up for the wastefulness of shared libraries
 275  * needing at least a page of dirty memory even if they have no global
 276  * data, we reclaim the gaps at the beginning and end of writable maps
 277  * and "donate" them to the heap by setting up minimal malloc
 278  * structures and then freeing them. */
 279
 280 static void reclaim(unsigned char *base, size_t start, size_t end)
 281 {
 282         size_t *a, *z;
 283         start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
 284         end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
 285         if (start>end || end-start < 4*sizeof(size_t)) return;
 286         a = (size_t *)(base + start);
 287         z = (size_t *)(base + end);
 288         a[-2] = 1;
 289         a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
 290         z[1] = 1;
 291         free(a);
 292 }
 293
 294 static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
 295 {
 296         for (; phcnt--; ph=(void *)((char *)ph+phent)) {
 297                 if (ph->p_type!=PT_LOAD) continue;
 298                 if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
 299                 reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
 300                 reclaim(base, ph->p_vaddr+ph->p_memsz,
 301                         ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
 302         }
 303 }
 304
 305 static void *map_library(int fd, struct dso *dso)
 306 {
 307         Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
 308         size_t phsize;
 309         size_t addr_min=SIZE_MAX, addr_max=0, map_len;
 310         size_t this_min, this_max;
 311         off_t off_start;
 312         Ehdr *eh;
 313         Phdr *ph, *ph0;
 314         unsigned prot;
 315         unsigned char *map, *base;
 316         size_t dyn;
 317         size_t tls_image=0;
 318         size_t i;
 319
 320         ssize_t l = read(fd, buf, sizeof buf);
 321         if (l<(int)sizeof *eh) return 0;
 322         eh = buf;
 323         if (eh->e_type != ET_DYN && eh->e_type != ET_EXEC) {
 324                 errno = ENOEXEC;
 325                 return 0;
 326         }
 327         phsize = eh->e_phentsize * eh->e_phnum;
 328         if (phsize + sizeof *eh > l) return 0;
 329         if (eh->e_phoff + phsize > l) {
 330                 l = pread(fd, buf+1, phsize, eh->e_phoff);
 331                 if (l != phsize) return 0;
 332                 ph = ph0 = (void *)(buf + 1);
 333         } else {
 334                 ph = ph0 = (void *)((char *)buf + eh->e_phoff);
 335         }
 336         for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
 337                 if (ph->p_type == PT_DYNAMIC)
 338                         dyn = ph->p_vaddr;
 339                 if (ph->p_type == PT_TLS) {
 340                         tls_image = ph->p_vaddr;
 341                         dso->tls_align = ph->p_align;
 342                         dso->tls_len = ph->p_filesz;
 343                         dso->tls_size = ph->p_memsz;
 344                 }
 345                 if (ph->p_type != PT_LOAD) continue;
 346                 if (ph->p_vaddr < addr_min) {
 347                         addr_min = ph->p_vaddr;
 348                         off_start = ph->p_offset;
 349                         prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
 350                                 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
 351                                 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
 352                 }
 353                 if (ph->p_vaddr+ph->p_memsz > addr_max) {
 354                         addr_max = ph->p_vaddr+ph->p_memsz;
 355                 }
 356         }
 357         if (!dyn) return 0;
 358         addr_max += PAGE_SIZE-1;
 359         addr_max &= -PAGE_SIZE;
 360         addr_min &= -PAGE_SIZE;
 361         off_start &= -PAGE_SIZE;
 362         map_len = addr_max - addr_min + off_start;
 363         /* The first time, we map too much, possibly even more than
 364          * the length of the file. This is okay because we will not
 365          * use the invalid part; we just need to reserve the right
 366          * amount of virtual address space to map over later. */
 367         map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
 368         if (map==MAP_FAILED) return 0;
 369         /* If the loaded file is not relocatable and the requested address is
 370          * not available, then the load operation must fail. */
 371         if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) {
 372                 errno = EBUSY;
 373                 goto error;
 374         }
 375         base = map - addr_min;
 376         dso->phdr = 0;
 377         dso->phnum = 0;
 378         for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
 379                 if (ph->p_type != PT_LOAD) continue;
 380                 /* Check if the programs headers are in this load segment, and
 381                  * if so, record the address for use by dl_iterate_phdr. */
 382                 if (!dso->phdr && eh->e_phoff >= ph->p_offset
 383                     && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
 384                         dso->phdr = (void *)(base + ph->p_vaddr
 385                                 + (eh->e_phoff-ph->p_offset));
 386                         dso->phnum = eh->e_phnum;
 387                 }
 388                 /* Reuse the existing mapping for the lowest-address LOAD */
 389                 if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
 390                 this_min = ph->p_vaddr & -PAGE_SIZE;
 391                 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
 392                 off_start = ph->p_offset & -PAGE_SIZE;
 393                 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
 394                         ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
 395                         ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
 396                 if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
 397                         goto error;
 398                 if (ph->p_memsz > ph->p_filesz) {
 399                         size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
 400                         size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
 401                         memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
 402                         if (pgbrk-(size_t)base < this_max && mmap((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED)
 403                                 goto error;
 404                 }
 405         }
 406         for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
 407                 if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
 408                         if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
 409                                 goto error;
 410                         break;
 411                 }
 412         if (!runtime) reclaim_gaps(base, ph0, eh->e_phentsize, eh->e_phnum);
 413         dso->map = map;
 414         dso->map_len = map_len;
 415         dso->base = base;
 416         dso->dynv = (void *)(base+dyn);
 417         if (dso->tls_size) dso->tls_image = (void *)(base+tls_image);
 418         return map;
 419 error:
 420         munmap(map, map_len);
 421         return 0;
 422 }
 423
 424 static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
 425 {
 426         size_t l;
 427         int fd;
 428         for (;;) {
 429                 s += strspn(s, ":\n");
 430                 l = strcspn(s, ":\n");
 431                 if (l-1 >= INT_MAX) return -1;
 432                 if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size)
 433                         continue;
 434                 if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
 435                 s += l;
 436         }
 437 }
 438
 439 static void decode_dyn(struct dso *p)
 440 {
 441         size_t dyn[DYN_CNT] = {0};
 442         decode_vec(p->dynv, dyn, DYN_CNT);
 443         p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
 444         p->strings = (void *)(p->base + dyn[DT_STRTAB]);
 445         if (dyn[0]&(1<<DT_HASH))
 446                 p->hashtab = (void *)(p->base + dyn[DT_HASH]);
 447         if (search_vec(p->dynv, dyn, DT_GNU_HASH))
 448                 p->ghashtab = (void *)(p->base + *dyn);
 449 }
 450
 451 static struct dso *load_library(const char *name)
 452 {
 453         char buf[2*NAME_MAX+2];
 454         const char *pathname;
 455         unsigned char *map;
 456         struct dso *p, temp_dso = {0};
 457         int fd;
 458         struct stat st;
 459         size_t alloc_size;
 460         int n_th = 0;
 461
 462         /* Catch and block attempts to reload the implementation itself */
 463         if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
 464                 static const char *rp, reserved[] =
 465                         "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
 466                 char *z = strchr(name, '.');
 467                 if (z) {
 468                         size_t l = z-name;
 469                         for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1);
 470                         if (*rp) {
 471                                 if (ldd_mode) {
 472                                         /* Track which names have been resolved
 473                                          * and only report each one once. */
 474                                         static unsigned reported;
 475                                         unsigned mask = 1U<<(rp-reserved);
 476                                         if (!(reported & mask)) {
 477                                                 reported |= mask;
 478                                                 dprintf(1, "\t%s => %s (%p)\n",
 479                                                         name, ldso->name,
 480                                                         ldso->base);
 481                                         }
 482                                 }
 483                                 if (!ldso->prev) {
 484                                         tail->next = ldso;
 485                                         ldso->prev = tail;
 486                                         tail = ldso->next ? ldso->next : ldso;
 487                                 }
 488                                 return ldso;
 489                         }
 490                 }
 491         }
 492         if (strchr(name, '/')) {
 493                 pathname = name;
 494                 fd = open(name, O_RDONLY|O_CLOEXEC);
 495         } else {
 496                 /* Search for the name to see if it's already loaded */
 497                 for (p=head->next; p; p=p->next) {
 498                         if (p->shortname && !strcmp(p->shortname, name)) {
 499                                 p->refcnt++;
 500                                 return p;
 501                         }
 502                 }
 503                 if (strlen(name) > NAME_MAX) return 0;
 504                 fd = -1;
 505                 if (r_path) fd = path_open(name, r_path, buf, sizeof buf);
 506                 if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf);
 507                 if (fd < 0) {
 508                         if (!sys_path) {
 509                                 char *prefix = 0;
 510                                 size_t prefix_len;
 511                                 if (ldso->name[0]=='/') {
 512                                         char *s, *t, *z;
 513                                         for (s=t=z=ldso->name; *s; s++)
 514                                                 if (*s=='/') z=t, t=s;
 515                                         prefix_len = z-ldso->name;
 516                                         if (prefix_len < PATH_MAX)
 517                                                 prefix = ldso->name;
 518                                 }
 519                                 if (!prefix) {
 520                                         prefix = "";
 521                                         prefix_len = 0;
 522                                 }
 523                                 char etc_ldso_path[prefix_len + 1
 524                                         + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"];
 525                                 snprintf(etc_ldso_path, sizeof etc_ldso_path,
 526                                         "%.*s/etc/ld-musl-" LDSO_ARCH ".path",
 527                                         (int)prefix_len, prefix);
 528                                 FILE *f = fopen(etc_ldso_path, "rbe");
 529                                 if (f) {
 530                                         if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
 531                                                 free(sys_path);
 532                                                 sys_path = "";
 533                                         }
 534                                         fclose(f);
 535                                 }
 536                         }
 537                         if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
 538                         fd = path_open(name, sys_path, buf, sizeof buf);
 539                 }
 540                 pathname = buf;
 541         }
 542         if (fd < 0) return 0;
 543         if (fstat(fd, &st) < 0) {
 544                 close(fd);
 545                 return 0;
 546         }
 547         for (p=head->next; p; p=p->next) {
 548                 if (p->dev == st.st_dev && p->ino == st.st_ino) {
 549                         /* If this library was previously loaded with a
 550                          * pathname but a search found the same inode,
 551                          * setup its shortname so it can be found by name. */
 552                         if (!p->shortname && pathname != name)
 553                                 p->shortname = strrchr(p->name, '/')+1;
 554                         close(fd);
 555                         p->refcnt++;
 556                         return p;
 557                 }
 558         }
 559         map = noload ? 0 : map_library(fd, &temp_dso);
 560         close(fd);
 561         if (!map) return 0;
 562
 563         /* Allocate storage for the new DSO. When there is TLS, this
 564          * storage must include a reservation for all pre-existing
 565          * threads to obtain copies of both the new TLS, and an
 566          * extended DTV capable of storing an additional slot for
 567          * the newly-loaded DSO. */
 568         alloc_size = sizeof *p + strlen(pathname) + 1;
 569         if (runtime && temp_dso.tls_image) {
 570                 size_t per_th = temp_dso.tls_size + temp_dso.tls_align
 571                         + sizeof(void *) * (tls_cnt+3);
 572                 n_th = libc.threads_minus_1 + 1;
 573                 if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX;
 574                 else alloc_size += n_th * per_th;
 575         }
 576         p = calloc(1, alloc_size);
 577         if (!p) {
 578                 munmap(map, temp_dso.map_len);
 579                 return 0;
 580         }
 581         memcpy(p, &temp_dso, sizeof temp_dso);
 582         decode_dyn(p);
 583         p->dev = st.st_dev;
 584         p->ino = st.st_ino;
 585         p->refcnt = 1;
 586         p->name = p->buf;
 587         strcpy(p->name, pathname);
 588         /* Add a shortname only if name arg was not an explicit pathname. */
 589         if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
 590         if (p->tls_image) {
 591                 if (runtime && !__pthread_self_init()) {
 592                         munmap(map, p->map_len);
 593                         free(p);
 594                         return 0;
 595                 }
 596                 p->tls_id = ++tls_cnt;
 597                 tls_align = MAXP2(tls_align, p->tls_align);
 598 #ifdef TLS_ABOVE_TP
 599                 p->tls_offset = tls_offset + ( (tls_align-1) &
 600                         -(tls_offset + (uintptr_t)p->tls_image) );
 601                 tls_offset += p->tls_size;
 602 #else
 603                 tls_offset += p->tls_size + p->tls_align - 1;
 604                 tls_offset -= (tls_offset + (uintptr_t)p->tls_image)
 605                         & (p->tls_align-1);
 606                 p->tls_offset = tls_offset;
 607 #endif
 608                 p->new_dtv = (void *)(-sizeof(size_t) &
 609                         (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
 610                 p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
 611         }
 612
 613         tail->next = p;
 614         p->prev = tail;
 615         tail = p;
 616
 617         if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);
 618
 619         return p;
 620 }
 621
 622 static void load_deps(struct dso *p)
 623 {
 624         size_t i, ndeps=0;
 625         struct dso ***deps = &p->deps, **tmp, *dep;
 626         for (; p; p=p->next) {
 627                 for (i=0; p->dynv[i]; i+=2) {
 628                         if (p->dynv[i] != DT_RPATH) continue;
 629                         r_path = (void *)(p->strings + p->dynv[i+1]);
 630                 }
 631                 for (i=0; p->dynv[i]; i+=2) {
 632                         if (p->dynv[i] != DT_NEEDED) continue;
 633                         dep = load_library(p->strings + p->dynv[i+1]);
 634                         if (!dep) {
 635                                 snprintf(errbuf, sizeof errbuf,
 636                                         "Error loading shared library %s: %m (needed by %s)",
 637                                         p->strings + p->dynv[i+1], p->name);
 638                                 if (runtime) longjmp(*rtld_fail, 1);
 639                                 dprintf(2, "%s\n", errbuf);
 640                                 ldso_fail = 1;
 641                                 continue;
 642                         }
 643                         if (runtime) {
 644                                 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
 645                                 if (!tmp) longjmp(*rtld_fail, 1);
 646                                 tmp[ndeps++] = dep;
 647                                 tmp[ndeps] = 0;
 648                                 *deps = tmp;
 649                         }
 650                 }
 651                 r_path = 0;
 652         }
 653 }
 654
 655 static void load_preload(char *s)
 656 {
 657         int tmp;
 658         char *z;
 659         for (z=s; *z; s=z) {
 660                 for (   ; *s && isspace(*s); s++);
 661                 for (z=s; *z && !isspace(*z); z++);
 662                 tmp = *z;
 663                 *z = 0;
 664                 load_library(s);
 665                 *z = tmp;
 666         }
 667 }
 668
 669 static void make_global(struct dso *p)
 670 {
 671         for (; p; p=p->next) p->global = 1;
 672 }
 673
 674 static void reloc_all(struct dso *p)
 675 {
 676         size_t dyn[DYN_CNT] = {0};
 677         for (; p; p=p->next) {
 678                 if (p->relocated) continue;
 679                 decode_vec(p->dynv, dyn, DYN_CNT);
 680 #ifdef NEED_ARCH_RELOCS
 681                 do_arch_relocs(p, head);
 682 #endif
 683                 do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
 684                         2+(dyn[DT_PLTREL]==DT_RELA));
 685                 do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
 686                 do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
 687                 p->relocated = 1;
 688         }
 689 }
 690
 691 static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride)
 692 {
 693         for (; cnt--; ph = (void *)((char *)ph + stride))
 694                 if (ph->p_type == PT_DYNAMIC)
 695                         return ph->p_vaddr;
 696         return 0;
 697 }
 698
 699 static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
 700 {
 701         size_t min_addr = -1, max_addr = 0;
 702         for (; cnt--; ph = (void *)((char *)ph + stride)) {
 703                 if (ph->p_type != PT_LOAD) continue;
 704                 if (ph->p_vaddr < min_addr)
 705                         min_addr = ph->p_vaddr;
 706                 if (ph->p_vaddr+ph->p_memsz > max_addr)
 707                         max_addr = ph->p_vaddr+ph->p_memsz;
 708         }
 709         min_addr &= -PAGE_SIZE;
 710         max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
 711         p->map = p->base + min_addr;
 712         p->map_len = max_addr - min_addr;
 713 }
 714
 715 static void do_fini()
 716 {
 717         struct dso *p;
 718         size_t dyn[DYN_CNT] = {0};
 719         for (p=fini_head; p; p=p->fini_next) {
 720                 if (!p->constructed) continue;
 721                 decode_vec(p->dynv, dyn, DYN_CNT);
 722                 if (dyn[0] & (1<<DT_FINI_ARRAY)) {
 723                         size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
 724                         size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n;
 725                         while (n--) ((void (*)(void))*--fn)();
 726                 }
 727 #ifndef NO_LEGACY_INITFINI
 728                 if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
 729                         ((void (*)(void))(p->base + dyn[DT_FINI]))();
 730 #endif
 731         }
 732 }
 733
 734 static void do_init_fini(struct dso *p)
 735 {
 736         size_t dyn[DYN_CNT] = {0};
 737         int need_locking = libc.threads_minus_1;
 738         /* Allow recursive calls that arise when a library calls
 739          * dlopen from one of its constructors, but block any
 740          * other threads until all ctors have finished. */
 741         if (need_locking) pthread_mutex_lock(&init_fini_lock);
 742         for (; p; p=p->prev) {
 743                 if (p->constructed) continue;
 744                 p->constructed = 1;
 745                 decode_vec(p->dynv, dyn, DYN_CNT);
 746                 if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
 747                         p->fini_next = fini_head;
 748                         fini_head = p;
 749                 }
 750 #ifndef NO_LEGACY_INITFINI
 751                 if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
 752                         ((void (*)(void))(p->base + dyn[DT_INIT]))();
 753 #endif
 754                 if (dyn[0] & (1<<DT_INIT_ARRAY)) {
 755                         size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
 756                         size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]);
 757                         while (n--) ((void (*)(void))*fn++)();
 758                 }
 759                 if (!need_locking && libc.threads_minus_1) {
 760                         need_locking = 1;
 761                         pthread_mutex_lock(&init_fini_lock);
 762                 }
 763         }
 764         if (need_locking) pthread_mutex_unlock(&init_fini_lock);
 765 }
 766
 767 void _dl_debug_state(void)
 768 {
 769 }
 770
 771 void *__copy_tls(unsigned char *mem)
 772 {
 773         pthread_t td;
 774         struct dso *p;
 775
 776         if (!tls_cnt) return mem;
 777
 778         void **dtv = (void *)mem;
 779         dtv[0] = (void *)tls_cnt;
 780
 781 #ifdef TLS_ABOVE_TP
 782         mem += sizeof(void *) * (tls_cnt+1);
 783         mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1);
 784         td = (pthread_t)mem;
 785         mem += sizeof(struct pthread);
 786
 787         for (p=head; p; p=p->next) {
 788                 if (!p->tls_id) continue;
 789                 dtv[p->tls_id] = mem + p->tls_offset;
 790                 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
 791         }
 792 #else
 793         mem += libc.tls_size - sizeof(struct pthread);
 794         mem -= (uintptr_t)mem & (tls_align-1);
 795         td = (pthread_t)mem;
 796
 797         for (p=head; p; p=p->next) {
 798                 if (!p->tls_id) continue;
 799                 dtv[p->tls_id] = mem - p->tls_offset;
 800                 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
 801         }
 802 #endif
 803         td->dtv = dtv;
 804         return td;
 805 }
 806
 807 void *__tls_get_addr(size_t *v)
 808 {
 809         pthread_t self = __pthread_self();
 810         if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]])
 811                 return (char *)self->dtv[v[0]]+v[1];
 812
 813         /* Block signals to make accessing new TLS async-signal-safe */
 814         sigset_t set;
 815         pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set);
 816         if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) {
 817                 pthread_sigmask(SIG_SETMASK, &set, 0);
 818                 return (char *)self->dtv[v[0]]+v[1];
 819         }
 820
 821         /* This is safe without any locks held because, if the caller
 822          * is able to request the Nth entry of the DTV, the DSO list
 823          * must be valid at least that far out and it was synchronized
 824          * at program startup or by an already-completed call to dlopen. */
 825         struct dso *p;
 826         for (p=head; p->tls_id != v[0]; p=p->next);
 827
 828         /* Get new DTV space from new DSO if needed */
 829         if (v[0] > (size_t)self->dtv[0]) {
 830                 void **newdtv = p->new_dtv +
 831                         (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
 832                 memcpy(newdtv, self->dtv,
 833                         ((size_t)self->dtv[0]+1) * sizeof(void *));
 834                 newdtv[0] = (void *)v[0];
 835                 self->dtv = newdtv;
 836         }
 837
 838         /* Get new TLS memory from new DSO */
 839         unsigned char *mem = p->new_tls +
 840                 (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1);
 841         mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1);
 842         self->dtv[v[0]] = mem;
 843         memcpy(mem, p->tls_image, p->tls_len);
 844         pthread_sigmask(SIG_SETMASK, &set, 0);
 845         return mem + v[1];
 846 }
 847
 848 static void update_tls_size()
 849 {
 850         libc.tls_size = ALIGN(
 851                 (1+tls_cnt) * sizeof(void *) +
 852                 tls_offset +
 853                 sizeof(struct pthread) +
 854                 tls_align * 2,
 855         tls_align);
 856 }
 857
 858 void *__dynlink(int argc, char **argv)
 859 {
 860         size_t aux[AUX_CNT] = {0};
 861         size_t i;
 862         Phdr *phdr;
 863         Ehdr *ehdr;
 864         static struct dso builtin_dsos[3];
 865         struct dso *const app = builtin_dsos+0;
 866         struct dso *const lib = builtin_dsos+1;
 867         struct dso *const vdso = builtin_dsos+2;
 868         char *env_preload=0;
 869         size_t vdso_base;
 870         size_t *auxv;
 871         char **envp = argv+argc+1;
 872
 873         /* Find aux vector just past environ[] */
 874         for (i=argc+1; argv[i]; i++)
 875                 if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
 876                         env_path = argv[i]+16;
 877                 else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
 878                         env_preload = argv[i]+11;
 879         auxv = (void *)(argv+i+1);
 880
 881         decode_vec(auxv, aux, AUX_CNT);
 882
 883         /* Only trust user/env if kernel says we're not suid/sgid */
 884         if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
 885           || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
 886                 env_path = 0;
 887                 env_preload = 0;
 888         }
 889
 890         /* If the dynamic linker was invoked as a program itself, AT_BASE
 891          * will not be set. In that case, we assume the base address is
 892          * the start of the page containing the PHDRs; I don't know any
 893          * better approach... */
 894         if (!aux[AT_BASE]) {
 895                 aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
 896                 aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
 897         }
 898
 899         /* The dynamic linker load address is passed by the kernel
 900          * in the AUX vector, so this is easy. */
 901         lib->base = (void *)aux[AT_BASE];
 902         lib->name = lib->shortname = "libc.so";
 903         lib->global = 1;
 904         ehdr = (void *)lib->base;
 905         lib->phnum = ehdr->e_phnum;
 906         lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
 907         find_map_range(lib->phdr, ehdr->e_phnum, ehdr->e_phentsize, lib);
 908         lib->dynv = (void *)(lib->base + find_dyn(lib->phdr,
 909                 ehdr->e_phnum, ehdr->e_phentsize));
 910         decode_dyn(lib);
 911
 912         if (aux[AT_PHDR]) {
 913                 size_t interp_off = 0;
 914                 size_t tls_image = 0;
 915                 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
 916                 app->phdr = phdr = (void *)aux[AT_PHDR];
 917                 app->phnum = aux[AT_PHNUM];
 918                 for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
 919                         if (phdr->p_type == PT_PHDR)
 920                                 app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
 921                         else if (phdr->p_type == PT_INTERP)
 922                                 interp_off = (size_t)phdr->p_vaddr;
 923                         else if (phdr->p_type == PT_TLS) {
 924                                 tls_image = phdr->p_vaddr;
 925                                 app->tls_len = phdr->p_filesz;
 926                                 app->tls_size = phdr->p_memsz;
 927                                 app->tls_align = phdr->p_align;
 928                         }
 929                 }
 930                 if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
 931                 if (interp_off) lib->name = (char *)app->base + interp_off;
 932                 app->name = argv[0];
 933                 app->dynv = (void *)(app->base + find_dyn(
 934                         (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));
 935                 find_map_range((void *)aux[AT_PHDR],
 936                         aux[AT_PHNUM], aux[AT_PHENT], app);
 937         } else {
 938                 int fd;
 939                 char *ldname = argv[0];
 940                 size_t l = strlen(ldname);
 941                 if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
 942                 *argv++ = (void *)-1;
 943                 if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1;
 944                 if (!argv[0]) {
 945                         dprintf(2, "musl libc/dynamic program loader\n");
 946                         dprintf(2, "usage: %s pathname%s\n", ldname,
 947                                 ldd_mode ? "" : " [args]");
 948                         _exit(1);
 949                 }
 950                 fd = open(argv[0], O_RDONLY);
 951                 if (fd < 0) {
 952                         dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
 953                         _exit(1);
 954                 }
 955                 runtime = 1;
 956                 ehdr = (void *)map_library(fd, app);
 957                 if (!ehdr) {
 958                         dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
 959                         _exit(1);
 960                 }
 961                 runtime = 0;
 962                 close(fd);
 963                 lib->name = ldname;
 964                 app->name = argv[0];
 965                 aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
 966                 /* Find the name that would have been used for the dynamic
 967                  * linker had ldd not taken its place. */
 968                 if (ldd_mode) {
 969                         for (i=0; i<app->phnum; i++) {
 970                                 if (app->phdr[i].p_type == PT_INTERP)
 971                                         lib->name = (void *)(app->base
 972                                                 + app->phdr[i].p_vaddr);
 973                         }
 974                         dprintf(1, "\t%s (%p)\n", lib->name, lib->base);
 975                 }
 976         }
 977         if (app->tls_size) {
 978                 app->tls_id = tls_cnt = 1;
 979 #ifdef TLS_ABOVE_TP
 980                 app->tls_offset = 0;
 981                 tls_offset = app->tls_size
 982                         + ( -((uintptr_t)app->tls_image + app->tls_size)
 983                         & (app->tls_align-1) );
 984 #else
 985                 tls_offset = app->tls_offset = app->tls_size
 986                         + ( -((uintptr_t)app->tls_image + app->tls_size)
 987                         & (app->tls_align-1) );
 988 #endif
 989                 tls_align = MAXP2(tls_align, app->tls_align);
 990         }
 991         app->global = 1;
 992         decode_dyn(app);
 993
 994         /* Attach to vdso, if provided by the kernel */
 995         if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
 996                 ehdr = (void *)vdso_base;
 997                 vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
 998                 vdso->phnum = ehdr->e_phnum;
 999                 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
1000                         if (phdr->p_type == PT_DYNAMIC)
1001                                 vdso->dynv = (void *)(vdso_base + phdr->p_offset);
1002                         if (phdr->p_type == PT_LOAD)
1003                                 vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
1004                 }
1005                 vdso->name = "";
1006                 vdso->shortname = "linux-gate.so.1";
1007                 vdso->global = 1;
1008                 decode_dyn(vdso);
1009                 vdso->prev = lib;
1010                 lib->next = vdso;
1011         }
1012
1013         /* Initial dso chain consists only of the app. We temporarily
1014          * append the dynamic linker/libc so we can relocate it, then
1015          * restore the initial chain in preparation for loading third
1016          * party libraries (preload/needed). */
1017         head = tail = app;
1018         ldso = lib;
1019         app->next = lib;
1020         reloc_all(lib);
1021         app->next = 0;
1022
1023         /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
1024
1025         /* Donate unused parts of app and library mapping to malloc */
1026         reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]);
1027         ehdr = (void *)lib->base;
1028         reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff),
1029                 ehdr->e_phentsize, ehdr->e_phnum);
1030
1031         /* Load preload/needed libraries, add their symbols to the global
1032          * namespace, and perform all remaining relocations. The main
1033          * program must be relocated LAST since it may contain copy
1034          * relocations which depend on libraries' relocations. */
1035         if (env_preload) load_preload(env_preload);
1036         load_deps(app);
1037         make_global(app);
1038
1039         reloc_all(app->next);
1040         reloc_all(app);
1041
1042         update_tls_size();
1043         if (tls_cnt) {
1044                 void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE,
1045                         MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
1046                 if (mem==MAP_FAILED ||
1047                     !__install_initial_tls(__copy_tls(mem))) {
1048                         dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
1049                                 argv[0], libc.tls_size);
1050                         _exit(127);
1051                 }
1052         }
1053
1054         if (ldso_fail) _exit(127);
1055         if (ldd_mode) _exit(0);
1056
1057         /* Switch to runtime mode: any further failures in the dynamic
1058          * linker are a reportable failure rather than a fatal startup
1059          * error. If the dynamic loader (dlopen) will not be used, free
1060          * all memory used by the dynamic linker. */
1061         runtime = 1;
1062
1063 #ifndef DYNAMIC_IS_RO
1064         for (i=0; app->dynv[i]; i+=2)
1065                 if (app->dynv[i]==DT_DEBUG)
1066                         app->dynv[i+1] = (size_t)&debug;
1067 #endif
1068         debug.ver = 1;
1069         debug.bp = _dl_debug_state;
1070         debug.head = head;
1071         debug.base = lib->base;
1072         debug.state = 0;
1073         _dl_debug_state();
1074
1075         if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]);
1076         __init_libc(envp, argv[0]);
1077         atexit(do_fini);
1078         errno = 0;
1079         do_init_fini(tail);
1080
1081         return (void *)aux[AT_ENTRY];
1082 }
1083
1084 void *dlopen(const char *file, int mode)
1085 {
1086         struct dso *volatile p, *orig_tail, *next;
1087         size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
1088         size_t i;
1089         int cs;
1090         jmp_buf jb;
1091
1092         if (!file) return head;
1093
1094         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
1095         pthread_rwlock_wrlock(&lock);
1096         __inhibit_ptc();
1097
1098         p = 0;
1099         orig_tls_cnt = tls_cnt;
1100         orig_tls_offset = tls_offset;
1101         orig_tls_align = tls_align;
1102         orig_tail = tail;
1103         noload = mode & RTLD_NOLOAD;
1104
1105         rtld_fail = &jb;
1106         if (setjmp(*rtld_fail)) {
1107                 /* Clean up anything new that was (partially) loaded */
1108                 if (p && p->deps) for (i=0; p->deps[i]; i++)
1109                         if (p->deps[i]->global < 0)
1110                                 p->deps[i]->global = 0;
1111                 for (p=orig_tail->next; p; p=next) {
1112                         next = p->next;
1113                         munmap(p->map, p->map_len);
1114                         free(p->deps);
1115                         free(p);
1116                 }
1117                 tls_cnt = orig_tls_cnt;
1118                 tls_offset = orig_tls_offset;
1119                 tls_align = orig_tls_align;
1120                 tail = orig_tail;
1121                 tail->next = 0;
1122                 p = 0;
1123                 errflag = 1;
1124                 goto end;
1125         } else p = load_library(file);
1126
1127         if (!p) {
1128                 snprintf(errbuf, sizeof errbuf, noload ?
1129                         "Library %s is not already loaded" :
1130                         "Error loading shared library %s: %m",
1131                         file);
1132                 errflag = 1;
1133                 goto end;
1134         }
1135
1136         /* First load handling */
1137         if (!p->deps) {
1138                 load_deps(p);
1139                 if (p->deps) for (i=0; p->deps[i]; i++)
1140                         if (!p->deps[i]->global)
1141                                 p->deps[i]->global = -1;
1142                 if (!p->global) p->global = -1;
1143                 reloc_all(p);
1144                 if (p->deps) for (i=0; p->deps[i]; i++)
1145                         if (p->deps[i]->global < 0)
1146                                 p->deps[i]->global = 0;
1147                 if (p->global < 0) p->global = 0;
1148         }
1149
1150         if (mode & RTLD_GLOBAL) {
1151                 if (p->deps) for (i=0; p->deps[i]; i++)
1152                         p->deps[i]->global = 1;
1153                 p->global = 1;
1154         }
1155
1156         update_tls_size();
1157
1158         if (ssp_used) __init_ssp(libc.auxv);
1159
1160         _dl_debug_state();
1161         orig_tail = tail;
1162 end:
1163         __release_ptc();
1164         if (p) gencnt++;
1165         pthread_rwlock_unlock(&lock);
1166         if (p) do_init_fini(orig_tail);
1167         pthread_setcancelstate(cs, 0);
1168         return p;
1169 }
1170
1171 static int invalid_dso_handle(void *h)
1172 {
1173         struct dso *p;
1174         for (p=head; p; p=p->next) if (h==p) return 0;
1175         snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1176         errflag = 1;
1177         return 1;
1178 }
1179
1180 static void *do_dlsym(struct dso *p, const char *s, void *ra)
1181 {
1182         size_t i;
1183         uint32_t h = 0, gh = 0;
1184         Sym *sym;
1185         if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
1186                 if (p == RTLD_DEFAULT) {
1187                         p = head;
1188                 } else if (p == RTLD_NEXT) {
1189                         for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
1190                         if (!p) p=head;
1191                         p = p->next;
1192                 }
1193                 struct symdef def = find_sym(p, s, 0);
1194                 if (!def.sym) goto failed;
1195                 if ((def.sym->st_info&0xf) == STT_TLS)
1196                         return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
1197                 return def.dso->base + def.sym->st_value;
1198         }
1199         if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
1200                 return 0;
1201         if (p->ghashtab) {
1202                 gh = gnu_hash(s);
1203                 sym = gnu_lookup(s, gh, p);
1204         } else {
1205                 h = sysv_hash(s);
1206                 sym = sysv_lookup(s, h, p);
1207         }
1208         if (sym && (sym->st_info&0xf) == STT_TLS)
1209                 return __tls_get_addr((size_t []){p->tls_id, sym->st_value});
1210         if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1211                 return p->base + sym->st_value;
1212         if (p->deps) for (i=0; p->deps[i]; i++) {
1213                 if (p->deps[i]->ghashtab) {
1214                         if (!gh) gh = gnu_hash(s);
1215                         sym = gnu_lookup(s, gh, p->deps[i]);
1216                 } else {
1217                         if (!h) h = sysv_hash(s);
1218                         sym = sysv_lookup(s, h, p->deps[i]);
1219                 }
1220                 if (sym && (sym->st_info&0xf) == STT_TLS)
1221                         return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value});
1222                 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1223                         return p->deps[i]->base + sym->st_value;
1224         }
1225 failed:
1226         errflag = 1;
1227         snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
1228         return 0;
1229 }
1230
1231 int __dladdr(void *addr, Dl_info *info)
1232 {
1233         struct dso *p;
1234         Sym *sym;
1235         uint32_t nsym;
1236         char *strings;
1237         size_t i;
1238         void *best = 0;
1239         char *bestname;
1240
1241         pthread_rwlock_rdlock(&lock);
1242         for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
1243         pthread_rwlock_unlock(&lock);
1244
1245         if (!p) return 0;
1246
1247         sym = p->syms;
1248         strings = p->strings;
1249         if (p->hashtab) {
1250                 nsym = p->hashtab[1];
1251         } else {
1252                 uint32_t *buckets;
1253                 uint32_t *hashval;
1254                 buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
1255                 sym += p->ghashtab[1];
1256                 for (i = 0; i < p->ghashtab[0]; i++) {
1257                         if (buckets[i] > nsym)
1258                                 nsym = buckets[i];
1259                 }
1260                 if (nsym) {
1261                         nsym -= p->ghashtab[1];
1262                         hashval = buckets + p->ghashtab[0] + nsym;
1263                         do nsym++;
1264                         while (!(*hashval++ & 1));
1265                 }
1266         }
1267
1268         for (; nsym; nsym--, sym++) {
1269                 if (sym->st_value
1270                  && (1<<(sym->st_info&0xf) & OK_TYPES)
1271                  && (1<<(sym->st_info>>4) & OK_BINDS)) {
1272                         void *symaddr = p->base + sym->st_value;
1273                         if (symaddr > addr || symaddr < best)
1274                                 continue;
1275                         best = symaddr;
1276                         bestname = strings + sym->st_name;
1277                         if (addr == symaddr)
1278                                 break;
1279                 }
1280         }
1281
1282         if (!best) return 0;
1283
1284         info->dli_fname = p->name;
1285         info->dli_fbase = p->base;
1286         info->dli_sname = bestname;
1287         info->dli_saddr = best;
1288
1289         return 1;
1290 }
1291
1292 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1293 {
1294         void *res;
1295         pthread_rwlock_rdlock(&lock);
1296         res = do_dlsym(p, s, ra);
1297         pthread_rwlock_unlock(&lock);
1298         return res;
1299 }
1300
1301 int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
1302 {
1303         struct dso *current;
1304         struct dl_phdr_info info;
1305         int ret = 0;
1306         for(current = head; current;) {
1307                 info.dlpi_addr      = (uintptr_t)current->base;
1308                 info.dlpi_name      = current->name;
1309                 info.dlpi_phdr      = current->phdr;
1310                 info.dlpi_phnum     = current->phnum;
1311                 info.dlpi_adds      = gencnt;
1312                 info.dlpi_subs      = 0;
1313                 info.dlpi_tls_modid = current->tls_id;
1314                 info.dlpi_tls_data  = current->tls_image;
1315
1316                 ret = (callback)(&info, sizeof (info), data);
1317
1318                 if (ret != 0) break;
1319
1320                 pthread_rwlock_rdlock(&lock);
1321                 current = current->next;
1322                 pthread_rwlock_unlock(&lock);
1323         }
1324         return ret;
1325 }
1326 #else
1327 static int invalid_dso_handle(void *h)
1328 {
1329         snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1330         errflag = 1;
1331         return 1;
1332 }
1333 void *dlopen(const char *file, int mode)
1334 {
1335         return 0;
1336 }
1337 void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
1338 {
1339         return 0;
1340 }
1341 int __dladdr (void *addr, Dl_info *info)
1342 {
1343         return 0;
1344 }
1345 #endif
1346
1347 int __dlinfo(void *dso, int req, void *res)
1348 {
1349         if (invalid_dso_handle(dso)) return -1;
1350         if (req != RTLD_DI_LINKMAP) {
1351                 snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req);
1352                 errflag = 1;
1353                 return -1;
1354         }
1355         *(struct link_map **)res = dso;
1356         return 0;
1357 }
1358
1359 char *dlerror()
1360 {
1361         if (!errflag) return 0;
1362         errflag = 0;
1363         return errbuf;
1364 }
1365
1366 int dlclose(void *p)
1367 {
1368         return invalid_dso_handle(p);
1369 }