blob: ca101993da5e16f2cbc9fc424682376088a66302 [file] [log] [blame]
Rich Felkerf419bcb2012-08-26 21:09:26 -04001#define _GNU_SOURCE
Rich Felker51e2d832011-06-18 19:48:42 -04002#include <stdio.h>
3#include <stdlib.h>
Rich Felker7c73cac2014-06-18 03:05:42 -04004#include <stdarg.h>
Rich Felker9d15d5e2014-06-19 02:01:06 -04005#include <stddef.h>
Rich Felker51e2d832011-06-18 19:48:42 -04006#include <string.h>
7#include <unistd.h>
8#include <stdint.h>
9#include <elf.h>
10#include <sys/mman.h>
11#include <limits.h>
Rich Felker51e2d832011-06-18 19:48:42 -040012#include <fcntl.h>
13#include <sys/stat.h>
14#include <errno.h>
Rich Felker18c0e022012-10-31 21:27:48 -040015#include <link.h>
Rich Felker6b3d5e52011-06-26 17:39:17 -040016#include <setjmp.h>
Rich Felker59ab43f2011-06-26 19:23:28 -040017#include <pthread.h>
Rich Felker2719cc82011-08-16 00:24:36 -040018#include <ctype.h>
Rich Felker59ab43f2011-06-26 19:23:28 -040019#include <dlfcn.h>
Rich Felker8431d792012-10-04 16:35:46 -040020#include "pthread_impl.h"
21#include "libc.h"
Rich Felker51e2d832011-06-18 19:48:42 -040022
Rich Felkera9e85c02012-03-23 00:28:20 -040023static int errflag;
Rich Felkera5d10eb2012-04-23 12:03:31 -040024static char errbuf[128];
Rich Felkera9e85c02012-03-23 00:28:20 -040025
Rich Felkere864a292012-07-11 01:47:30 -040026#ifdef SHARED
Rich Felkera9e85c02012-03-23 00:28:20 -040027
Rich Felker51e2d832011-06-18 19:48:42 -040028#if ULONG_MAX == 0xffffffff
29typedef Elf32_Ehdr Ehdr;
30typedef Elf32_Phdr Phdr;
31typedef Elf32_Sym Sym;
32#define R_TYPE(x) ((x)&255)
33#define R_SYM(x) ((x)>>8)
34#else
35typedef Elf64_Ehdr Ehdr;
36typedef Elf64_Phdr Phdr;
37typedef Elf64_Sym Sym;
38#define R_TYPE(x) ((x)&0xffffffff)
39#define R_SYM(x) ((x)>>32)
40#endif
41
Rich Felkercf3fd3d2012-10-06 01:22:51 -040042#define MAXP2(a,b) (-(-(a)&-(b)))
43#define ALIGN(x,y) ((x)+(y)-1 & -(y))
44
Rich Felker3ec8d292012-04-25 00:05:42 -040045struct debug {
46 int ver;
47 void *head;
48 void (*bp)(void);
49 int state;
50 void *base;
51};
52
Rich Felker9d15d5e2014-06-19 02:01:06 -040053struct td_index {
54 size_t args[2];
55 struct td_index *next;
56};
57
Rich Felker3ec8d292012-04-25 00:05:42 -040058struct dso {
59 unsigned char *base;
60 char *name;
Rich Felker51e2d832011-06-18 19:48:42 -040061 size_t *dynv;
Rich Felker3ec8d292012-04-25 00:05:42 -040062 struct dso *next, *prev;
63
Rich Felker18c0e022012-10-31 21:27:48 -040064 Phdr *phdr;
65 int phnum;
Timo Teräs87691962014-03-25 20:59:50 +020066 size_t phentsize;
Rich Felker3ec8d292012-04-25 00:05:42 -040067 int refcnt;
Rich Felker51e2d832011-06-18 19:48:42 -040068 Sym *syms;
Rich Felker596d60c2011-06-18 22:52:01 -040069 uint32_t *hashtab;
Rich Felker2bd05a42012-08-25 17:13:28 -040070 uint32_t *ghashtab;
Rich Felker72482f92013-08-08 16:10:35 -040071 int16_t *versym;
Rich Felker51e2d832011-06-18 19:48:42 -040072 char *strings;
Rich Felker51e2d832011-06-18 19:48:42 -040073 unsigned char *map;
74 size_t map_len;
75 dev_t dev;
76 ino_t ino;
Rich Felker6343ac82012-06-09 21:20:44 -040077 signed char global;
Rich Felker700a8152012-02-07 20:29:29 -050078 char relocated;
79 char constructed;
Rich Felkera897a202013-08-23 13:56:30 -040080 char kernel_mapped;
Rich Felker709355e2013-08-23 11:15:40 -040081 struct dso **deps, *needed_by;
Rich Felkera897a202013-08-23 13:56:30 -040082 char *rpath_orig, *rpath;
Rich Felkerbc6a35f2012-10-04 20:04:13 -040083 void *tls_image;
Rich Felker9c748562012-10-04 22:48:33 -040084 size_t tls_len, tls_size, tls_align, tls_id, tls_offset;
Timo Teräse13a2b82014-03-25 14:13:27 +020085 size_t relro_start, relro_end;
Rich Felkerdcd60372012-10-05 11:51:50 -040086 void **new_dtv;
87 unsigned char *new_tls;
Rich Felker56fbaa32015-03-03 22:50:02 -050088 volatile int new_dtv_idx, new_tls_idx;
Rich Felker9d15d5e2014-06-19 02:01:06 -040089 struct td_index *td_index;
Rich Felkerf4f77c02012-10-05 13:09:09 -040090 struct dso *fini_next;
Rich Felker5c1909a2012-05-27 16:01:44 -040091 char *shortname;
Rich Felker6b3d5e52011-06-26 17:39:17 -040092 char buf[];
Rich Felker51e2d832011-06-18 19:48:42 -040093};
94
Rich Felker9c748562012-10-04 22:48:33 -040095struct symdef {
96 Sym *sym;
97 struct dso *dso;
98};
99
Rich Felkeradf94c12014-06-18 02:44:02 -0400100enum {
101 REL_ERR,
102 REL_SYMBOLIC,
103 REL_GOT,
104 REL_PLT,
105 REL_RELATIVE,
106 REL_OFFSET,
107 REL_OFFSET32,
108 REL_COPY,
109 REL_SYM_OR_REL,
110 REL_TLS, /* everything past here is TLS */
111 REL_DTPMOD,
112 REL_DTPOFF,
113 REL_TPOFF,
114 REL_TPOFF_NEG,
Rich Felker9d15d5e2014-06-19 02:01:06 -0400115 REL_TLSDESC,
Rich Felkeradf94c12014-06-18 02:44:02 -0400116};
117
Rich Felker59f40862012-08-05 13:46:39 -0400118#include "reloc.h"
119
Rich Felkerdab441a2014-03-24 16:57:11 -0400120int __init_tp(void *);
Rich Felker75863602013-07-21 03:00:54 -0400121void __init_libc(char **, char *);
Rich Felker60872cf2012-04-24 18:07:59 -0400122
Rich Felker179ab5a2013-12-01 17:27:25 -0500123const char *__libc_get_version(void);
124
Rich Felkerbd679592015-03-06 13:27:08 -0500125static struct builtin_tls {
126 char c;
127 struct pthread pt;
128 void *space[16];
129} builtin_tls[1];
130#define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt)
131
Rich Felkere23d3582012-10-13 23:25:20 -0400132static struct dso *head, *tail, *ldso, *fini_head;
Rich Felker709355e2013-08-23 11:15:40 -0400133static char *env_path, *sys_path;
Rich Felker18c0e022012-10-31 21:27:48 -0400134static unsigned long long gencnt;
Rich Felker6b3d5e52011-06-26 17:39:17 -0400135static int runtime;
Rich Felker5c1909a2012-05-27 16:01:44 -0400136static int ldd_mode;
Rich Felker04109502012-08-18 16:00:23 -0400137static int ldso_fail;
Rich Felker4d07e552013-01-23 22:07:45 -0500138static int noload;
Rich Felker17276be2013-07-24 02:38:05 -0400139static jmp_buf *rtld_fail;
Rich Felker59ab43f2011-06-26 19:23:28 -0400140static pthread_rwlock_t lock;
Rich Felker3ec8d292012-04-25 00:05:42 -0400141static struct debug debug;
Rich Felkerbd679592015-03-06 13:27:08 -0500142static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN;
Rich Felker9d15d5e2014-06-19 02:01:06 -0400143static size_t static_tls_cnt;
Rich Felkerf4f77c02012-10-05 13:09:09 -0400144static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE };
Rich Felker3ec8d292012-04-25 00:05:42 -0400145
146struct debug *_dl_debug_addr = &debug;
Rich Felker51e2d832011-06-18 19:48:42 -0400147
Rich Felker0a96a372012-10-07 21:43:46 -0400148#define AUX_CNT 38
Rich Felker51e2d832011-06-18 19:48:42 -0400149#define DYN_CNT 34
150
151static void decode_vec(size_t *v, size_t *a, size_t cnt)
152{
153 memset(a, 0, cnt*sizeof(size_t));
154 for (; v[0]; v+=2) if (v[0]<cnt) {
155 a[0] |= 1ULL<<v[0];
156 a[v[0]] = v[1];
157 }
158}
159
Rich Felker2bd05a42012-08-25 17:13:28 -0400160static int search_vec(size_t *v, size_t *r, size_t key)
161{
162 for (; v[0]!=key; v+=2)
163 if (!v[0]) return 0;
164 *r = v[1];
165 return 1;
166}
167
Rich Felker7c73cac2014-06-18 03:05:42 -0400168static void error(const char *fmt, ...)
169{
170 va_list ap;
171 va_start(ap, fmt);
172 vsnprintf(errbuf, sizeof errbuf, fmt, ap);
173 va_end(ap);
174 if (runtime) longjmp(*rtld_fail, 1);
175 dprintf(2, "%s\n", errbuf);
176 ldso_fail = 1;
177}
178
Rich Felker2bd05a42012-08-25 17:13:28 -0400179static uint32_t sysv_hash(const char *s0)
Rich Felker51e2d832011-06-18 19:48:42 -0400180{
Rich Felker2adf2fb2012-01-17 00:34:58 -0500181 const unsigned char *s = (void *)s0;
Rich Felker51e2d832011-06-18 19:48:42 -0400182 uint_fast32_t h = 0;
183 while (*s) {
184 h = 16*h + *s++;
185 h ^= h>>24 & 0xf0;
186 }
187 return h & 0xfffffff;
188}
189
Rich Felker2bd05a42012-08-25 17:13:28 -0400190static uint32_t gnu_hash(const char *s0)
191{
192 const unsigned char *s = (void *)s0;
193 uint_fast32_t h = 5381;
194 for (; *s; s++)
195 h = h*33 + *s;
196 return h;
197}
198
199static Sym *sysv_lookup(const char *s, uint32_t h, struct dso *dso)
Rich Felker51e2d832011-06-18 19:48:42 -0400200{
201 size_t i;
Rich Felker05eff012012-08-05 02:38:35 -0400202 Sym *syms = dso->syms;
203 uint32_t *hashtab = dso->hashtab;
204 char *strings = dso->strings;
Rich Felker51e2d832011-06-18 19:48:42 -0400205 for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
Rich Felker72482f92013-08-08 16:10:35 -0400206 if ((!dso->versym || dso->versym[i] >= 0)
207 && (!strcmp(s, strings+syms[i].st_name)))
Rich Felker51e2d832011-06-18 19:48:42 -0400208 return syms+i;
209 }
210 return 0;
211}
212
Rich Felker2bd05a42012-08-25 17:13:28 -0400213static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso)
214{
Rich Felker72482f92013-08-08 16:10:35 -0400215 Sym *syms = dso->syms;
216 char *strings = dso->strings;
Rich Felker2bd05a42012-08-25 17:13:28 -0400217 uint32_t *hashtab = dso->ghashtab;
218 uint32_t nbuckets = hashtab[0];
219 uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4);
220 uint32_t h2;
221 uint32_t *hashval;
Rich Felker72482f92013-08-08 16:10:35 -0400222 uint32_t i = buckets[h1 % nbuckets];
Rich Felker2bd05a42012-08-25 17:13:28 -0400223
Rich Felker72482f92013-08-08 16:10:35 -0400224 if (!i) return 0;
Rich Felker2bd05a42012-08-25 17:13:28 -0400225
Rich Felker72482f92013-08-08 16:10:35 -0400226 hashval = buckets + nbuckets + (i - hashtab[1]);
Rich Felker2bd05a42012-08-25 17:13:28 -0400227
Rich Felker72482f92013-08-08 16:10:35 -0400228 for (h1 |= 1; ; i++) {
Rich Felker2bd05a42012-08-25 17:13:28 -0400229 h2 = *hashval++;
Rich Felker72482f92013-08-08 16:10:35 -0400230 if ((!dso->versym || dso->versym[i] >= 0)
231 && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name))
232 return syms+i;
Rich Felker2bd05a42012-08-25 17:13:28 -0400233 if (h2 & 1) break;
234 }
235
236 return 0;
237}
238
Rich Felker9c748562012-10-04 22:48:33 -0400239#define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS)
Rich Felkere152ee92013-07-24 11:53:23 -0400240#define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE)
Rich Felker51e2d832011-06-18 19:48:42 -0400241
Rich Felker2d8cc922014-06-30 01:18:14 -0400242#ifndef ARCH_SYM_REJECT_UND
243#define ARCH_SYM_REJECT_UND(s) 0
244#endif
245
Rich Felker9c748562012-10-04 22:48:33 -0400246static struct symdef find_sym(struct dso *dso, const char *s, int need_def)
Rich Felker51e2d832011-06-18 19:48:42 -0400247{
Rich Felker2bd05a42012-08-25 17:13:28 -0400248 uint32_t h = 0, gh = 0;
Rich Felker9c748562012-10-04 22:48:33 -0400249 struct symdef def = {0};
Rich Felker51e2d832011-06-18 19:48:42 -0400250 for (; dso; dso=dso->next) {
Rich Felker59ab43f2011-06-26 19:23:28 -0400251 Sym *sym;
252 if (!dso->global) continue;
Rich Felker2bd05a42012-08-25 17:13:28 -0400253 if (dso->ghashtab) {
254 if (!gh) gh = gnu_hash(s);
255 sym = gnu_lookup(s, gh, dso);
256 } else {
257 if (!h) h = sysv_hash(s);
258 sym = sysv_lookup(s, h, dso);
259 }
Rich Felkerbd174312012-10-06 01:36:11 -0400260 if (!sym) continue;
261 if (!sym->st_shndx)
Rich Felker2d8cc922014-06-30 01:18:14 -0400262 if (need_def || (sym->st_info&0xf) == STT_TLS
263 || ARCH_SYM_REJECT_UND(sym))
Rich Felkerbd174312012-10-06 01:36:11 -0400264 continue;
265 if (!sym->st_value)
266 if ((sym->st_info&0xf) != STT_TLS)
267 continue;
268 if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue;
269 if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue;
270
271 if (def.sym && sym->st_info>>4 == STB_WEAK) continue;
272 def.sym = sym;
273 def.dso = dso;
274 if (sym->st_info>>4 == STB_GLOBAL) break;
Rich Felker51e2d832011-06-18 19:48:42 -0400275 }
Rich Felker427173b2011-07-24 02:19:47 -0400276 return def;
Rich Felker51e2d832011-06-18 19:48:42 -0400277}
278
Rich Felkeradf94c12014-06-18 02:44:02 -0400279#define NO_INLINE_ADDEND (1<<REL_COPY | 1<<REL_GOT | 1<<REL_PLT)
280
Rich Felker9d15d5e2014-06-19 02:01:06 -0400281ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic();
282
Rich Felker87d13a42012-08-05 02:49:02 -0400283static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride)
Rich Felker51e2d832011-06-18 19:48:42 -0400284{
Rich Felker87d13a42012-08-05 02:49:02 -0400285 unsigned char *base = dso->base;
286 Sym *syms = dso->syms;
287 char *strings = dso->strings;
Rich Felker51e2d832011-06-18 19:48:42 -0400288 Sym *sym;
289 const char *name;
Rich Felker51e2d832011-06-18 19:48:42 -0400290 void *ctx;
Rich Felkeradf94c12014-06-18 02:44:02 -0400291 int astype, type;
Rich Felker51e2d832011-06-18 19:48:42 -0400292 int sym_index;
Rich Felker9c748562012-10-04 22:48:33 -0400293 struct symdef def;
Rich Felkeradf94c12014-06-18 02:44:02 -0400294 size_t *reloc_addr;
295 size_t sym_val;
296 size_t tls_val;
297 size_t addend;
Rich Felker51e2d832011-06-18 19:48:42 -0400298
299 for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) {
Rich Felkeradf94c12014-06-18 02:44:02 -0400300 astype = R_TYPE(rel[1]);
301 if (!astype) continue;
302 type = remap_rel(astype);
303 if (!type) {
Rich Felker9a4ad022014-06-29 21:52:54 -0400304 error("Error relocating %s: unsupported relocation type %d",
Rich Felkeradf94c12014-06-18 02:44:02 -0400305 dso->name, astype);
Rich Felkeradf94c12014-06-18 02:44:02 -0400306 continue;
307 }
Rich Felker51e2d832011-06-18 19:48:42 -0400308 sym_index = R_SYM(rel[1]);
Rich Felkeradf94c12014-06-18 02:44:02 -0400309 reloc_addr = (void *)(base + rel[0]);
Rich Felker51e2d832011-06-18 19:48:42 -0400310 if (sym_index) {
311 sym = syms + sym_index;
312 name = strings + sym->st_name;
Rich Felkeradf94c12014-06-18 02:44:02 -0400313 ctx = type==REL_COPY ? head->next : head;
314 def = find_sym(ctx, name, type==REL_PLT);
Rich Felker69003e02014-01-21 00:36:35 -0500315 if (!def.sym && (sym->st_shndx != SHN_UNDEF
316 || sym->st_info>>4 != STB_WEAK)) {
Rich Felker9a4ad022014-06-29 21:52:54 -0400317 error("Error relocating %s: %s: symbol not found",
Rich Felker87d13a42012-08-05 02:49:02 -0400318 dso->name, name);
Rich Felker04109502012-08-18 16:00:23 -0400319 continue;
Rich Felker6b3d5e52011-06-26 17:39:17 -0400320 }
Rich Felker7d9a5c62012-08-05 14:03:17 -0400321 } else {
Rich Felker9c748562012-10-04 22:48:33 -0400322 sym = 0;
323 def.sym = 0;
Rich Felkeradf94c12014-06-18 02:44:02 -0400324 def.dso = dso;
Rich Felker51e2d832011-06-18 19:48:42 -0400325 }
Rich Felkeradf94c12014-06-18 02:44:02 -0400326
327 addend = stride>2 ? rel[2]
328 : (1<<type & NO_INLINE_ADDEND) ? 0
329 : *reloc_addr;
330
331 sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0;
332 tls_val = def.sym ? def.sym->st_value : 0;
333
334 switch(type) {
335 case REL_OFFSET:
336 addend -= (size_t)reloc_addr;
337 case REL_SYMBOLIC:
338 case REL_GOT:
339 case REL_PLT:
340 *reloc_addr = sym_val + addend;
341 break;
342 case REL_RELATIVE:
343 *reloc_addr = (size_t)base + addend;
344 break;
345 case REL_SYM_OR_REL:
346 if (sym) *reloc_addr = sym_val + addend;
347 else *reloc_addr = (size_t)base + addend;
348 break;
349 case REL_COPY:
350 memcpy(reloc_addr, (void *)sym_val, sym->st_size);
351 break;
352 case REL_OFFSET32:
353 *(uint32_t *)reloc_addr = sym_val + addend
354 - (size_t)reloc_addr;
355 break;
356 case REL_DTPMOD:
357 *reloc_addr = def.dso->tls_id;
358 break;
359 case REL_DTPOFF:
360 *reloc_addr = tls_val + addend;
361 break;
362#ifdef TLS_ABOVE_TP
363 case REL_TPOFF:
364 *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend;
365 break;
366#else
367 case REL_TPOFF:
368 *reloc_addr = tls_val - def.dso->tls_offset + addend;
369 break;
370 case REL_TPOFF_NEG:
371 *reloc_addr = def.dso->tls_offset - tls_val + addend;
372 break;
373#endif
Rich Felker9d15d5e2014-06-19 02:01:06 -0400374 case REL_TLSDESC:
375 if (stride<3) addend = reloc_addr[1];
376 if (runtime && def.dso->tls_id >= static_tls_cnt) {
377 struct td_index *new = malloc(sizeof *new);
Rich Felker9a4ad022014-06-29 21:52:54 -0400378 if (!new) error(
Rich Felker9d15d5e2014-06-19 02:01:06 -0400379 "Error relocating %s: cannot allocate TLSDESC for %s",
380 dso->name, sym ? name : "(local)" );
381 new->next = dso->td_index;
382 dso->td_index = new;
383 new->args[0] = def.dso->tls_id;
384 new->args[1] = tls_val + addend;
385 reloc_addr[0] = (size_t)__tlsdesc_dynamic;
386 reloc_addr[1] = (size_t)new;
387 } else {
388 reloc_addr[0] = (size_t)__tlsdesc_static;
389#ifdef TLS_ABOVE_TP
390 reloc_addr[1] = tls_val + def.dso->tls_offset
391 + TPOFF_K + addend;
392#else
393 reloc_addr[1] = tls_val - def.dso->tls_offset
394 + addend;
395#endif
396 }
397 break;
Rich Felkeradf94c12014-06-18 02:44:02 -0400398 }
Rich Felker51e2d832011-06-18 19:48:42 -0400399 }
400}
401
Rich Felker6717e622011-06-28 19:40:14 -0400402/* A huge hack: to make up for the wastefulness of shared libraries
403 * needing at least a page of dirty memory even if they have no global
404 * data, we reclaim the gaps at the beginning and end of writable maps
405 * and "donate" them to the heap by setting up minimal malloc
406 * structures and then freeing them. */
407
Timo Teräse13a2b82014-03-25 14:13:27 +0200408static void reclaim(struct dso *dso, size_t start, size_t end)
Rich Felker6717e622011-06-28 19:40:14 -0400409{
410 size_t *a, *z;
Timo Teräse13a2b82014-03-25 14:13:27 +0200411 if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end;
412 if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start;
Rich Felker6717e622011-06-28 19:40:14 -0400413 start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t);
414 end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t);
415 if (start>end || end-start < 4*sizeof(size_t)) return;
Timo Teräse13a2b82014-03-25 14:13:27 +0200416 a = (size_t *)(dso->base + start);
417 z = (size_t *)(dso->base + end);
Rich Felker6717e622011-06-28 19:40:14 -0400418 a[-2] = 1;
419 a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1;
420 z[1] = 1;
421 free(a);
422}
423
Timo Teräs87691962014-03-25 20:59:50 +0200424static void reclaim_gaps(struct dso *dso)
Rich Felker6717e622011-06-28 19:40:14 -0400425{
Rich Felkerfa7248c2014-03-25 16:21:50 -0400426 Phdr *ph = dso->phdr;
427 size_t phcnt = dso->phnum;
Timo Teräs87691962014-03-25 20:59:50 +0200428
Rich Felkerfa7248c2014-03-25 16:21:50 -0400429 for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) {
Rich Felker6717e622011-06-28 19:40:14 -0400430 if (ph->p_type!=PT_LOAD) continue;
431 if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
Timo Teräse13a2b82014-03-25 14:13:27 +0200432 reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
433 reclaim(dso, ph->p_vaddr+ph->p_memsz,
Rich Felker6717e622011-06-28 19:40:14 -0400434 ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE);
435 }
436}
437
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400438static void *map_library(int fd, struct dso *dso)
Rich Felker51e2d832011-06-18 19:48:42 -0400439{
Rich Felker59633c72011-06-25 12:26:08 -0400440 Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)];
Rich Felkerd5884a52013-08-02 09:56:49 -0400441 void *allocated_buf=0;
Rich Felker51e2d832011-06-18 19:48:42 -0400442 size_t phsize;
443 size_t addr_min=SIZE_MAX, addr_max=0, map_len;
444 size_t this_min, this_max;
445 off_t off_start;
446 Ehdr *eh;
Rich Felker30763fd2013-07-10 14:38:20 -0400447 Phdr *ph, *ph0;
Rich Felker51e2d832011-06-18 19:48:42 -0400448 unsigned prot;
Rich Felkerd5884a52013-08-02 09:56:49 -0400449 unsigned char *map=MAP_FAILED, *base;
Rich Felker7443dd22013-08-02 09:25:12 -0400450 size_t dyn=0;
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400451 size_t tls_image=0;
Rich Felker51e2d832011-06-18 19:48:42 -0400452 size_t i;
453
454 ssize_t l = read(fd, buf, sizeof buf);
Rich Felker59633c72011-06-25 12:26:08 -0400455 eh = buf;
Rich Felkerd5884a52013-08-02 09:56:49 -0400456 if (l<0) return 0;
457 if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC))
458 goto noexec;
Rich Felker51e2d832011-06-18 19:48:42 -0400459 phsize = eh->e_phentsize * eh->e_phnum;
Rich Felkerd5884a52013-08-02 09:56:49 -0400460 if (phsize > sizeof buf - sizeof *eh) {
461 allocated_buf = malloc(phsize);
462 if (!allocated_buf) return 0;
463 l = pread(fd, allocated_buf, phsize, eh->e_phoff);
464 if (l < 0) goto error;
465 if (l != phsize) goto noexec;
466 ph = ph0 = allocated_buf;
467 } else if (eh->e_phoff + phsize > l) {
Rich Felker59633c72011-06-25 12:26:08 -0400468 l = pread(fd, buf+1, phsize, eh->e_phoff);
Rich Felkerd5884a52013-08-02 09:56:49 -0400469 if (l < 0) goto error;
470 if (l != phsize) goto noexec;
Rich Felker30763fd2013-07-10 14:38:20 -0400471 ph = ph0 = (void *)(buf + 1);
472 } else {
473 ph = ph0 = (void *)((char *)buf + eh->e_phoff);
Rich Felker51e2d832011-06-18 19:48:42 -0400474 }
Rich Felker51e2d832011-06-18 19:48:42 -0400475 for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
Rich Felkerfa7248c2014-03-25 16:21:50 -0400476 if (ph->p_type == PT_DYNAMIC) {
Rich Felker51e2d832011-06-18 19:48:42 -0400477 dyn = ph->p_vaddr;
Rich Felkerfa7248c2014-03-25 16:21:50 -0400478 } else if (ph->p_type == PT_TLS) {
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400479 tls_image = ph->p_vaddr;
480 dso->tls_align = ph->p_align;
481 dso->tls_len = ph->p_filesz;
482 dso->tls_size = ph->p_memsz;
Timo Teräse13a2b82014-03-25 14:13:27 +0200483 } else if (ph->p_type == PT_GNU_RELRO) {
484 dso->relro_start = ph->p_vaddr & -PAGE_SIZE;
485 dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400486 }
Rich Felker51e2d832011-06-18 19:48:42 -0400487 if (ph->p_type != PT_LOAD) continue;
488 if (ph->p_vaddr < addr_min) {
489 addr_min = ph->p_vaddr;
490 off_start = ph->p_offset;
491 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
492 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
493 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
494 }
495 if (ph->p_vaddr+ph->p_memsz > addr_max) {
496 addr_max = ph->p_vaddr+ph->p_memsz;
497 }
498 }
Rich Felkerd5884a52013-08-02 09:56:49 -0400499 if (!dyn) goto noexec;
Rich Felker51e2d832011-06-18 19:48:42 -0400500 addr_max += PAGE_SIZE-1;
501 addr_max &= -PAGE_SIZE;
502 addr_min &= -PAGE_SIZE;
503 off_start &= -PAGE_SIZE;
504 map_len = addr_max - addr_min + off_start;
505 /* The first time, we map too much, possibly even more than
506 * the length of the file. This is okay because we will not
507 * use the invalid part; we just need to reserve the right
508 * amount of virtual address space to map over later. */
Rich Felkerbf301002011-06-28 14:20:41 -0400509 map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start);
Rich Felkerd5884a52013-08-02 09:56:49 -0400510 if (map==MAP_FAILED) goto error;
Rich Felker339516a2013-07-31 14:42:08 -0400511 /* If the loaded file is not relocatable and the requested address is
512 * not available, then the load operation must fail. */
513 if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) {
514 errno = EBUSY;
515 goto error;
516 }
Rich Felker51e2d832011-06-18 19:48:42 -0400517 base = map - addr_min;
Rich Felker30763fd2013-07-10 14:38:20 -0400518 dso->phdr = 0;
519 dso->phnum = 0;
520 for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
Rich Felker51e2d832011-06-18 19:48:42 -0400521 if (ph->p_type != PT_LOAD) continue;
Rich Felker30763fd2013-07-10 14:38:20 -0400522 /* Check if the programs headers are in this load segment, and
523 * if so, record the address for use by dl_iterate_phdr. */
524 if (!dso->phdr && eh->e_phoff >= ph->p_offset
525 && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) {
526 dso->phdr = (void *)(base + ph->p_vaddr
527 + (eh->e_phoff-ph->p_offset));
528 dso->phnum = eh->e_phnum;
Timo Teräs87691962014-03-25 20:59:50 +0200529 dso->phentsize = eh->e_phentsize;
Rich Felker30763fd2013-07-10 14:38:20 -0400530 }
Rich Felker51e2d832011-06-18 19:48:42 -0400531 /* Reuse the existing mapping for the lowest-address LOAD */
532 if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
533 this_min = ph->p_vaddr & -PAGE_SIZE;
534 this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE;
535 off_start = ph->p_offset & -PAGE_SIZE;
536 prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) |
537 ((ph->p_flags&PF_W) ? PROT_WRITE: 0) |
538 ((ph->p_flags&PF_X) ? PROT_EXEC : 0));
Rich Felkerf7d15dc2012-06-06 11:21:28 -0400539 if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED)
540 goto error;
Rich Felker51e2d832011-06-18 19:48:42 -0400541 if (ph->p_memsz > ph->p_filesz) {
542 size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz;
543 size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE;
544 memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1);
Rich Felkerf7d15dc2012-06-06 11:21:28 -0400545 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)
546 goto error;
Rich Felker51e2d832011-06-18 19:48:42 -0400547 }
548 }
Rich Felker9f174132011-06-29 00:29:08 -0400549 for (i=0; ((size_t *)(base+dyn))[i]; i+=2)
550 if (((size_t *)(base+dyn))[i]==DT_TEXTREL) {
Rich Felkerf7d15dc2012-06-06 11:21:28 -0400551 if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0)
552 goto error;
Rich Felker9f174132011-06-29 00:29:08 -0400553 break;
554 }
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400555 dso->map = map;
556 dso->map_len = map_len;
557 dso->base = base;
558 dso->dynv = (void *)(base+dyn);
559 if (dso->tls_size) dso->tls_image = (void *)(base+tls_image);
Timo Teräs87691962014-03-25 20:59:50 +0200560 if (!runtime) reclaim_gaps(dso);
Rich Felker8d01dfc2013-08-02 09:59:02 -0400561 free(allocated_buf);
Rich Felker51e2d832011-06-18 19:48:42 -0400562 return map;
Rich Felkerd5884a52013-08-02 09:56:49 -0400563noexec:
564 errno = ENOEXEC;
Rich Felkerf7d15dc2012-06-06 11:21:28 -0400565error:
Rich Felkerd5884a52013-08-02 09:56:49 -0400566 if (map!=MAP_FAILED) munmap(map, map_len);
567 free(allocated_buf);
Rich Felkerf7d15dc2012-06-06 11:21:28 -0400568 return 0;
Rich Felker51e2d832011-06-18 19:48:42 -0400569}
570
Rich Felker8c203ea2013-04-20 11:51:58 -0400571static int path_open(const char *name, const char *s, char *buf, size_t buf_size)
Rich Felker568b8072011-06-25 01:56:34 -0400572{
Rich Felker8c203ea2013-04-20 11:51:58 -0400573 size_t l;
574 int fd;
Rich Felker49388f32011-06-25 17:49:16 -0400575 for (;;) {
Rich Felker8c203ea2013-04-20 11:51:58 -0400576 s += strspn(s, ":\n");
577 l = strcspn(s, ":\n");
578 if (l-1 >= INT_MAX) return -1;
579 if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size)
580 continue;
Rich Felkerf2d08cf2012-09-29 17:59:50 -0400581 if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd;
Rich Felker49388f32011-06-25 17:49:16 -0400582 s += l;
Rich Felker568b8072011-06-25 01:56:34 -0400583 }
Rich Felker568b8072011-06-25 01:56:34 -0400584}
585
Rich Felkera897a202013-08-23 13:56:30 -0400586static int fixup_rpath(struct dso *p, char *buf, size_t buf_size)
587{
588 size_t n, l;
589 const char *s, *t, *origin;
590 char *d;
591 if (p->rpath) return 0;
592 if (!p->rpath_orig) return -1;
593 if (!strchr(p->rpath_orig, '$')) {
594 p->rpath = p->rpath_orig;
595 return 0;
596 }
597 n = 0;
598 s = p->rpath_orig;
Rich Felkerd2c42ed2013-08-23 15:51:59 -0400599 while ((t=strchr(s, '$'))) {
600 if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9))
601 return -1;
Rich Felkera897a202013-08-23 13:56:30 -0400602 s = t+1;
603 n++;
604 }
605 if (n > SSIZE_MAX/PATH_MAX) return -1;
606
607 if (p->kernel_mapped) {
608 /* $ORIGIN searches cannot be performed for the main program
609 * when it is suid/sgid/AT_SECURE. This is because the
610 * pathname is under the control of the caller of execve.
611 * For libraries, however, $ORIGIN can be processed safely
612 * since the library's pathname came from a trusted source
613 * (either system paths or a call to dlopen). */
614 if (libc.secure)
615 return -1;
Rich Felkerd2c42ed2013-08-23 15:51:59 -0400616 l = readlink("/proc/self/exe", buf, buf_size);
617 if (l >= buf_size)
Rich Felkera897a202013-08-23 13:56:30 -0400618 return -1;
Rich Felkerd2c42ed2013-08-23 15:51:59 -0400619 buf[l] = 0;
Rich Felkera897a202013-08-23 13:56:30 -0400620 origin = buf;
621 } else {
622 origin = p->name;
623 }
624 t = strrchr(origin, '/');
625 l = t ? t-origin : 0;
626 p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1);
627 if (!p->rpath) return -1;
628
629 d = p->rpath;
630 s = p->rpath_orig;
Rich Felkerd2c42ed2013-08-23 15:51:59 -0400631 while ((t=strchr(s, '$'))) {
Rich Felkera897a202013-08-23 13:56:30 -0400632 memcpy(d, s, t-s);
633 d += t-s;
634 memcpy(d, origin, l);
635 d += l;
Rich Felkerd2c42ed2013-08-23 15:51:59 -0400636 /* It was determined previously that the '$' is followed
637 * either by "ORIGIN" or "{ORIGIN}". */
Rich Felkera897a202013-08-23 13:56:30 -0400638 s = t + 7 + 2*(t[1]=='{');
639 }
640 strcpy(d, s);
641 return 0;
642}
643
Rich Felkerc82f4a32012-01-23 00:57:38 -0500644static void decode_dyn(struct dso *p)
645{
646 size_t dyn[DYN_CNT] = {0};
647 decode_vec(p->dynv, dyn, DYN_CNT);
648 p->syms = (void *)(p->base + dyn[DT_SYMTAB]);
Rich Felkerc82f4a32012-01-23 00:57:38 -0500649 p->strings = (void *)(p->base + dyn[DT_STRTAB]);
Rich Felker2bd05a42012-08-25 17:13:28 -0400650 if (dyn[0]&(1<<DT_HASH))
651 p->hashtab = (void *)(p->base + dyn[DT_HASH]);
Rich Felker709355e2013-08-23 11:15:40 -0400652 if (dyn[0]&(1<<DT_RPATH))
Rich Felkera897a202013-08-23 13:56:30 -0400653 p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]);
Rich Felkerd8dc2b72014-11-23 16:17:57 -0500654 if (dyn[0]&(1<<DT_RUNPATH))
655 p->rpath_orig = (void *)(p->strings + dyn[DT_RUNPATH]);
Rich Felker2bd05a42012-08-25 17:13:28 -0400656 if (search_vec(p->dynv, dyn, DT_GNU_HASH))
657 p->ghashtab = (void *)(p->base + *dyn);
Rich Felker72482f92013-08-08 16:10:35 -0400658 if (search_vec(p->dynv, dyn, DT_VERSYM))
659 p->versym = (void *)(p->base + *dyn);
Rich Felkerc82f4a32012-01-23 00:57:38 -0500660}
661
Rich Felker709355e2013-08-23 11:15:40 -0400662static struct dso *load_library(const char *name, struct dso *needed_by)
Rich Felker51e2d832011-06-18 19:48:42 -0400663{
Rich Felker5c1909a2012-05-27 16:01:44 -0400664 char buf[2*NAME_MAX+2];
Rich Felker0420b872012-07-11 01:41:20 -0400665 const char *pathname;
Rich Felker1d7c4f82012-12-15 23:34:08 -0500666 unsigned char *map;
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400667 struct dso *p, temp_dso = {0};
Rich Felker51e2d832011-06-18 19:48:42 -0400668 int fd;
669 struct stat st;
Rich Felkerdcd60372012-10-05 11:51:50 -0400670 size_t alloc_size;
671 int n_th = 0;
Rich Felkerf8c376d2013-07-31 14:59:36 -0400672 int is_self = 0;
Rich Felker51e2d832011-06-18 19:48:42 -0400673
Rich Felker59549312014-07-11 00:29:44 -0400674 if (!*name) {
675 errno = EINVAL;
676 return 0;
677 }
678
Rich Felker51e2d832011-06-18 19:48:42 -0400679 /* Catch and block attempts to reload the implementation itself */
680 if (name[0]=='l' && name[1]=='i' && name[2]=='b') {
681 static const char *rp, reserved[] =
682 "c\0pthread\0rt\0m\0dl\0util\0xnet\0";
683 char *z = strchr(name, '.');
684 if (z) {
685 size_t l = z-name;
Rich Felker27593d32013-07-31 15:14:06 -0400686 for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1);
Rich Felker51e2d832011-06-18 19:48:42 -0400687 if (*rp) {
Rich Felkera97a0502013-07-26 14:41:12 -0400688 if (ldd_mode) {
689 /* Track which names have been resolved
690 * and only report each one once. */
691 static unsigned reported;
692 unsigned mask = 1U<<(rp-reserved);
693 if (!(reported & mask)) {
694 reported |= mask;
695 dprintf(1, "\t%s => %s (%p)\n",
696 name, ldso->name,
697 ldso->base);
698 }
699 }
Rich Felkerf8c376d2013-07-31 14:59:36 -0400700 is_self = 1;
Rich Felker51e2d832011-06-18 19:48:42 -0400701 }
702 }
703 }
Rich Felkerf8c376d2013-07-31 14:59:36 -0400704 if (!strcmp(name, ldso->name)) is_self = 1;
705 if (is_self) {
706 if (!ldso->prev) {
707 tail->next = ldso;
708 ldso->prev = tail;
709 tail = ldso->next ? ldso->next : ldso;
710 }
711 return ldso;
712 }
Rich Felker59ab43f2011-06-26 19:23:28 -0400713 if (strchr(name, '/')) {
Rich Felker0420b872012-07-11 01:41:20 -0400714 pathname = name;
Rich Felkerf2d08cf2012-09-29 17:59:50 -0400715 fd = open(name, O_RDONLY|O_CLOEXEC);
Rich Felker51e2d832011-06-18 19:48:42 -0400716 } else {
Rich Felker0420b872012-07-11 01:41:20 -0400717 /* Search for the name to see if it's already loaded */
718 for (p=head->next; p; p=p->next) {
719 if (p->shortname && !strcmp(p->shortname, name)) {
720 p->refcnt++;
721 return p;
722 }
723 }
Rich Felker59ab43f2011-06-26 19:23:28 -0400724 if (strlen(name) > NAME_MAX) return 0;
Rich Felker568b8072011-06-25 01:56:34 -0400725 fd = -1;
Rich Felker3e3753c2013-08-02 10:02:29 -0400726 if (env_path) fd = path_open(name, env_path, buf, sizeof buf);
Rich Felker709355e2013-08-23 11:15:40 -0400727 for (p=needed_by; fd < 0 && p; p=p->needed_by)
Rich Felkera897a202013-08-23 13:56:30 -0400728 if (!fixup_rpath(p, buf, sizeof buf))
Rich Felker709355e2013-08-23 11:15:40 -0400729 fd = path_open(name, p->rpath, buf, sizeof buf);
Rich Felker568b8072011-06-25 01:56:34 -0400730 if (fd < 0) {
731 if (!sys_path) {
Rich Felkerf389c492013-07-18 19:29:44 -0400732 char *prefix = 0;
733 size_t prefix_len;
734 if (ldso->name[0]=='/') {
735 char *s, *t, *z;
736 for (s=t=z=ldso->name; *s; s++)
737 if (*s=='/') z=t, t=s;
738 prefix_len = z-ldso->name;
739 if (prefix_len < PATH_MAX)
740 prefix = ldso->name;
741 }
742 if (!prefix) {
743 prefix = "";
744 prefix_len = 0;
745 }
746 char etc_ldso_path[prefix_len + 1
747 + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"];
748 snprintf(etc_ldso_path, sizeof etc_ldso_path,
749 "%.*s/etc/ld-musl-" LDSO_ARCH ".path",
750 (int)prefix_len, prefix);
751 FILE *f = fopen(etc_ldso_path, "rbe");
Rich Felker568b8072011-06-25 01:56:34 -0400752 if (f) {
Rich Felker11bc1732013-06-26 10:17:29 -0400753 if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) {
Rich Felker59b481d2013-06-26 10:51:36 -0400754 free(sys_path);
Rich Felker11bc1732013-06-26 10:17:29 -0400755 sys_path = "";
Rich Felker65465102012-11-09 13:49:40 -0500756 }
Rich Felker568b8072011-06-25 01:56:34 -0400757 fclose(f);
Rich Felkerff4be702013-09-09 13:39:08 -0400758 } else if (errno != ENOENT) {
759 sys_path = "";
Rich Felker568b8072011-06-25 01:56:34 -0400760 }
761 }
Rich Felker40d5f7e2012-11-08 22:41:16 -0500762 if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib";
763 fd = path_open(name, sys_path, buf, sizeof buf);
Rich Felker51e2d832011-06-18 19:48:42 -0400764 }
Rich Felker0420b872012-07-11 01:41:20 -0400765 pathname = buf;
Rich Felker51e2d832011-06-18 19:48:42 -0400766 }
767 if (fd < 0) return 0;
768 if (fstat(fd, &st) < 0) {
769 close(fd);
770 return 0;
771 }
772 for (p=head->next; p; p=p->next) {
773 if (p->dev == st.st_dev && p->ino == st.st_ino) {
Rich Felker0420b872012-07-11 01:41:20 -0400774 /* If this library was previously loaded with a
775 * pathname but a search found the same inode,
776 * setup its shortname so it can be found by name. */
Rich Felker5f88c0e2012-10-05 12:09:54 -0400777 if (!p->shortname && pathname != name)
778 p->shortname = strrchr(p->name, '/')+1;
Rich Felker51e2d832011-06-18 19:48:42 -0400779 close(fd);
780 p->refcnt++;
781 return p;
782 }
783 }
Rich Felker4d07e552013-01-23 22:07:45 -0500784 map = noload ? 0 : map_library(fd, &temp_dso);
Rich Felker51e2d832011-06-18 19:48:42 -0400785 close(fd);
786 if (!map) return 0;
Rich Felkerdcd60372012-10-05 11:51:50 -0400787
788 /* Allocate storage for the new DSO. When there is TLS, this
789 * storage must include a reservation for all pre-existing
790 * threads to obtain copies of both the new TLS, and an
791 * extended DTV capable of storing an additional slot for
792 * the newly-loaded DSO. */
793 alloc_size = sizeof *p + strlen(pathname) + 1;
794 if (runtime && temp_dso.tls_image) {
795 size_t per_th = temp_dso.tls_size + temp_dso.tls_align
796 + sizeof(void *) * (tls_cnt+3);
Rich Felkere23d3582012-10-13 23:25:20 -0400797 n_th = libc.threads_minus_1 + 1;
Rich Felkerdcd60372012-10-05 11:51:50 -0400798 if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX;
799 else alloc_size += n_th * per_th;
800 }
801 p = calloc(1, alloc_size);
Rich Felker51e2d832011-06-18 19:48:42 -0400802 if (!p) {
Rich Felker74025c82013-02-02 00:59:25 -0500803 munmap(map, temp_dso.map_len);
Rich Felker51e2d832011-06-18 19:48:42 -0400804 return 0;
805 }
Rich Felkerbc6a35f2012-10-04 20:04:13 -0400806 memcpy(p, &temp_dso, sizeof temp_dso);
Rich Felkerc82f4a32012-01-23 00:57:38 -0500807 decode_dyn(p);
Rich Felker51e2d832011-06-18 19:48:42 -0400808 p->dev = st.st_dev;
809 p->ino = st.st_ino;
Rich Felker51e2d832011-06-18 19:48:42 -0400810 p->refcnt = 1;
Rich Felker709355e2013-08-23 11:15:40 -0400811 p->needed_by = needed_by;
Rich Felker6b3d5e52011-06-26 17:39:17 -0400812 p->name = p->buf;
Rich Felker0420b872012-07-11 01:41:20 -0400813 strcpy(p->name, pathname);
814 /* Add a shortname only if name arg was not an explicit pathname. */
815 if (pathname != name) p->shortname = strrchr(p->name, '/')+1;
Rich Felkerdcd60372012-10-05 11:51:50 -0400816 if (p->tls_image) {
Rich Felkerdab441a2014-03-24 16:57:11 -0400817 if (runtime && !libc.has_thread_pointer) {
Rich Felker74025c82013-02-02 00:59:25 -0500818 munmap(map, p->map_len);
Rich Felker92e1cd92012-10-06 16:56:35 -0400819 free(p);
Rich Felkerdab441a2014-03-24 16:57:11 -0400820 errno = ENOSYS;
Rich Felker92e1cd92012-10-06 16:56:35 -0400821 return 0;
822 }
Rich Felkerdcd60372012-10-05 11:51:50 -0400823 p->tls_id = ++tls_cnt;
Rich Felkercf3fd3d2012-10-06 01:22:51 -0400824 tls_align = MAXP2(tls_align, p->tls_align);
Rich Felker9ec42832012-10-15 18:51:53 -0400825#ifdef TLS_ABOVE_TP
826 p->tls_offset = tls_offset + ( (tls_align-1) &
827 -(tls_offset + (uintptr_t)p->tls_image) );
828 tls_offset += p->tls_size;
829#else
Rich Felkercf3fd3d2012-10-06 01:22:51 -0400830 tls_offset += p->tls_size + p->tls_align - 1;
831 tls_offset -= (tls_offset + (uintptr_t)p->tls_image)
832 & (p->tls_align-1);
833 p->tls_offset = tls_offset;
Rich Felker9ec42832012-10-15 18:51:53 -0400834#endif
Rich Felkerdcd60372012-10-05 11:51:50 -0400835 p->new_dtv = (void *)(-sizeof(size_t) &
836 (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t)));
837 p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1));
838 }
Rich Felker51e2d832011-06-18 19:48:42 -0400839
840 tail->next = p;
841 p->prev = tail;
842 tail = p;
843
Rich Felker1d7c4f82012-12-15 23:34:08 -0500844 if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base);
Rich Felker5c1909a2012-05-27 16:01:44 -0400845
Rich Felker51e2d832011-06-18 19:48:42 -0400846 return p;
847}
848
849static void load_deps(struct dso *p)
850{
Rich Felker59ab43f2011-06-26 19:23:28 -0400851 size_t i, ndeps=0;
852 struct dso ***deps = &p->deps, **tmp, *dep;
Rich Felker51e2d832011-06-18 19:48:42 -0400853 for (; p; p=p->next) {
854 for (i=0; p->dynv[i]; i+=2) {
855 if (p->dynv[i] != DT_NEEDED) continue;
Rich Felker709355e2013-08-23 11:15:40 -0400856 dep = load_library(p->strings + p->dynv[i+1], p);
Rich Felker59ab43f2011-06-26 19:23:28 -0400857 if (!dep) {
Rich Felker9a4ad022014-06-29 21:52:54 -0400858 error("Error loading shared library %s: %m (needed by %s)",
Rich Felker6b3d5e52011-06-26 17:39:17 -0400859 p->strings + p->dynv[i+1], p->name);
Rich Felker04109502012-08-18 16:00:23 -0400860 continue;
Rich Felker6b3d5e52011-06-26 17:39:17 -0400861 }
Rich Felker59ab43f2011-06-26 19:23:28 -0400862 if (runtime) {
863 tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2));
Rich Felker17276be2013-07-24 02:38:05 -0400864 if (!tmp) longjmp(*rtld_fail, 1);
Rich Felker59ab43f2011-06-26 19:23:28 -0400865 tmp[ndeps++] = dep;
866 tmp[ndeps] = 0;
867 *deps = tmp;
868 }
Rich Felker51e2d832011-06-18 19:48:42 -0400869 }
870 }
871}
872
Rich Felker2719cc82011-08-16 00:24:36 -0400873static void load_preload(char *s)
874{
875 int tmp;
876 char *z;
877 for (z=s; *z; s=z) {
Rich Felker349381a2014-07-11 00:26:12 -0400878 for ( ; *s && (isspace(*s) || *s==':'); s++);
879 for (z=s; *z && !isspace(*z) && *z!=':'; z++);
Rich Felker2719cc82011-08-16 00:24:36 -0400880 tmp = *z;
881 *z = 0;
Rich Felker709355e2013-08-23 11:15:40 -0400882 load_library(s, 0);
Rich Felker2719cc82011-08-16 00:24:36 -0400883 *z = tmp;
884 }
885}
886
Rich Felker59ab43f2011-06-26 19:23:28 -0400887static void make_global(struct dso *p)
888{
889 for (; p; p=p->next) p->global = 1;
890}
891
Rich Felker51e2d832011-06-18 19:48:42 -0400892static void reloc_all(struct dso *p)
893{
894 size_t dyn[DYN_CNT] = {0};
895 for (; p; p=p->next) {
896 if (p->relocated) continue;
897 decode_vec(p->dynv, dyn, DYN_CNT);
Rich Felkerbabf8202012-08-05 12:50:26 -0400898#ifdef NEED_ARCH_RELOCS
899 do_arch_relocs(p, head);
900#endif
Rich Felker87d13a42012-08-05 02:49:02 -0400901 do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ],
902 2+(dyn[DT_PLTREL]==DT_RELA));
903 do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2);
904 do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3);
Timo Teräse13a2b82014-03-25 14:13:27 +0200905
906 if (p->relro_start != p->relro_end &&
907 mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) {
Rich Felker9a4ad022014-06-29 21:52:54 -0400908 error("Error relocating %s: RELRO protection failed: %m",
Timo Teräse13a2b82014-03-25 14:13:27 +0200909 p->name);
Timo Teräse13a2b82014-03-25 14:13:27 +0200910 }
911
Rich Felker368ba4a2011-06-25 00:18:19 -0400912 p->relocated = 1;
Rich Felker51e2d832011-06-18 19:48:42 -0400913 }
914}
915
Timo Teräs87691962014-03-25 20:59:50 +0200916static void kernel_mapped_dso(struct dso *p)
Rich Felkerc82f4a32012-01-23 00:57:38 -0500917{
Timo Teräs87691962014-03-25 20:59:50 +0200918 size_t min_addr = -1, max_addr = 0, cnt;
919 Phdr *ph = p->phdr;
920 for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) {
921 if (ph->p_type == PT_DYNAMIC) {
922 p->dynv = (void *)(p->base + ph->p_vaddr);
923 } else if (ph->p_type == PT_GNU_RELRO) {
Timo Teräse13a2b82014-03-25 14:13:27 +0200924 p->relro_start = ph->p_vaddr & -PAGE_SIZE;
925 p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE;
926 }
Rich Felkerf419bcb2012-08-26 21:09:26 -0400927 if (ph->p_type != PT_LOAD) continue;
928 if (ph->p_vaddr < min_addr)
929 min_addr = ph->p_vaddr;
930 if (ph->p_vaddr+ph->p_memsz > max_addr)
931 max_addr = ph->p_vaddr+ph->p_memsz;
932 }
933 min_addr &= -PAGE_SIZE;
934 max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE;
935 p->map = p->base + min_addr;
936 p->map_len = max_addr - min_addr;
Timo Teräs87691962014-03-25 20:59:50 +0200937 p->kernel_mapped = 1;
Rich Felkerf419bcb2012-08-26 21:09:26 -0400938}
939
Rich Felkerf4f77c02012-10-05 13:09:09 -0400940static void do_fini()
941{
942 struct dso *p;
943 size_t dyn[DYN_CNT] = {0};
944 for (p=fini_head; p; p=p->fini_next) {
945 if (!p->constructed) continue;
946 decode_vec(p->dynv, dyn, DYN_CNT);
Rich Felkere69ae842013-07-20 18:26:17 -0400947 if (dyn[0] & (1<<DT_FINI_ARRAY)) {
948 size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t);
Rich Felker1b413572013-07-21 02:35:46 -0400949 size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n;
950 while (n--) ((void (*)(void))*--fn)();
Rich Felkere69ae842013-07-20 18:26:17 -0400951 }
Rich Felker1da53da2013-07-22 14:08:33 -0400952#ifndef NO_LEGACY_INITFINI
Rich Felkerd0c6cb02013-07-31 00:04:10 -0400953 if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI])
Rich Felkere69ae842013-07-20 18:26:17 -0400954 ((void (*)(void))(p->base + dyn[DT_FINI]))();
Rich Felker1da53da2013-07-22 14:08:33 -0400955#endif
Rich Felkerf4f77c02012-10-05 13:09:09 -0400956 }
957}
958
Rich Felker4ce3cb52012-02-06 14:39:09 -0500959static void do_init_fini(struct dso *p)
960{
961 size_t dyn[DYN_CNT] = {0};
Rich Felkere23d3582012-10-13 23:25:20 -0400962 int need_locking = libc.threads_minus_1;
Rich Felkerf4f77c02012-10-05 13:09:09 -0400963 /* Allow recursive calls that arise when a library calls
964 * dlopen from one of its constructors, but block any
965 * other threads until all ctors have finished. */
966 if (need_locking) pthread_mutex_lock(&init_fini_lock);
Rich Felker4ce3cb52012-02-06 14:39:09 -0500967 for (; p; p=p->prev) {
Rich Felkerf4f77c02012-10-05 13:09:09 -0400968 if (p->constructed) continue;
969 p->constructed = 1;
Rich Felker4ce3cb52012-02-06 14:39:09 -0500970 decode_vec(p->dynv, dyn, DYN_CNT);
Rich Felkere69ae842013-07-20 18:26:17 -0400971 if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) {
Rich Felkerf4f77c02012-10-05 13:09:09 -0400972 p->fini_next = fini_head;
973 fini_head = p;
974 }
Rich Felker1da53da2013-07-22 14:08:33 -0400975#ifndef NO_LEGACY_INITFINI
Rich Felkerd0c6cb02013-07-31 00:04:10 -0400976 if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT])
Rich Felker4ce3cb52012-02-06 14:39:09 -0500977 ((void (*)(void))(p->base + dyn[DT_INIT]))();
Rich Felker1da53da2013-07-22 14:08:33 -0400978#endif
Rich Felkere69ae842013-07-20 18:26:17 -0400979 if (dyn[0] & (1<<DT_INIT_ARRAY)) {
980 size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t);
981 size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]);
982 while (n--) ((void (*)(void))*fn++)();
983 }
Rich Felker509b50e2013-06-29 02:24:02 -0400984 if (!need_locking && libc.threads_minus_1) {
985 need_locking = 1;
986 pthread_mutex_lock(&init_fini_lock);
987 }
Rich Felker4ce3cb52012-02-06 14:39:09 -0500988 }
Rich Felkerf4f77c02012-10-05 13:09:09 -0400989 if (need_locking) pthread_mutex_unlock(&init_fini_lock);
Rich Felker4ce3cb52012-02-06 14:39:09 -0500990}
991
Rich Felker3ec8d292012-04-25 00:05:42 -0400992void _dl_debug_state(void)
993{
994}
995
Rich Felker7c6c2902013-08-03 16:27:30 -0400996void __reset_tls()
997{
998 pthread_t self = __pthread_self();
999 struct dso *p;
1000 for (p=head; p; p=p->next) {
1001 if (!p->tls_id || !self->dtv[p->tls_id]) continue;
1002 memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len);
1003 memset((char *)self->dtv[p->tls_id]+p->tls_len, 0,
1004 p->tls_size - p->tls_len);
1005 if (p->tls_id == (size_t)self->dtv[0]) break;
1006 }
1007}
1008
Rich Felkerdcd60372012-10-05 11:51:50 -04001009void *__copy_tls(unsigned char *mem)
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001010{
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001011 pthread_t td;
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001012 struct dso *p;
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001013
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001014 void **dtv = (void *)mem;
Rich Felkerdcd60372012-10-05 11:51:50 -04001015 dtv[0] = (void *)tls_cnt;
Rich Felkerdab441a2014-03-24 16:57:11 -04001016 if (!tls_cnt) {
1017 td = (void *)(dtv+1);
1018 td->dtv = dtv;
1019 return td;
1020 }
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001021
Rich Felker9ec42832012-10-15 18:51:53 -04001022#ifdef TLS_ABOVE_TP
1023 mem += sizeof(void *) * (tls_cnt+1);
1024 mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1);
1025 td = (pthread_t)mem;
1026 mem += sizeof(struct pthread);
1027
1028 for (p=head; p; p=p->next) {
1029 if (!p->tls_id) continue;
1030 dtv[p->tls_id] = mem + p->tls_offset;
1031 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
1032 }
1033#else
Rich Felkere23d3582012-10-13 23:25:20 -04001034 mem += libc.tls_size - sizeof(struct pthread);
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001035 mem -= (uintptr_t)mem & (tls_align-1);
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001036 td = (pthread_t)mem;
1037
1038 for (p=head; p; p=p->next) {
Rich Felkerdcd60372012-10-05 11:51:50 -04001039 if (!p->tls_id) continue;
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001040 dtv[p->tls_id] = mem - p->tls_offset;
1041 memcpy(dtv[p->tls_id], p->tls_image, p->tls_len);
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001042 }
Rich Felker9ec42832012-10-15 18:51:53 -04001043#endif
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001044 td->dtv = dtv;
1045 return td;
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001046}
1047
Rich Felker5ba238e2014-06-19 02:59:44 -04001048void *__tls_get_new(size_t *v)
Rich Felker9b153c02012-10-04 21:01:56 -04001049{
1050 pthread_t self = __pthread_self();
Rich Felkerdcd60372012-10-05 11:51:50 -04001051
1052 /* Block signals to make accessing new TLS async-signal-safe */
1053 sigset_t set;
Rich Felker5ba238e2014-06-19 02:59:44 -04001054 __block_all_sigs(&set);
Rich Felkere75b16c2014-06-19 02:16:57 -04001055 if (v[0]<=(size_t)self->dtv[0]) {
Rich Felker5ba238e2014-06-19 02:59:44 -04001056 __restore_sigs(&set);
Rich Felkerdcd60372012-10-05 11:51:50 -04001057 return (char *)self->dtv[v[0]]+v[1];
Rich Felker9b153c02012-10-04 21:01:56 -04001058 }
Rich Felkerdcd60372012-10-05 11:51:50 -04001059
1060 /* This is safe without any locks held because, if the caller
1061 * is able to request the Nth entry of the DTV, the DSO list
1062 * must be valid at least that far out and it was synchronized
1063 * at program startup or by an already-completed call to dlopen. */
1064 struct dso *p;
1065 for (p=head; p->tls_id != v[0]; p=p->next);
1066
1067 /* Get new DTV space from new DSO if needed */
Rich Felker44b4d092013-06-03 16:35:59 -04001068 if (v[0] > (size_t)self->dtv[0]) {
Rich Felkerdcd60372012-10-05 11:51:50 -04001069 void **newdtv = p->new_dtv +
1070 (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1);
Rich Felker44b4d092013-06-03 16:35:59 -04001071 memcpy(newdtv, self->dtv,
Rich Felkerdcd60372012-10-05 11:51:50 -04001072 ((size_t)self->dtv[0]+1) * sizeof(void *));
1073 newdtv[0] = (void *)v[0];
1074 self->dtv = newdtv;
1075 }
1076
Rich Felkere75b16c2014-06-19 02:16:57 -04001077 /* Get new TLS memory from all new DSOs up to the requested one */
1078 unsigned char *mem;
1079 for (p=head; ; p=p->next) {
1080 if (!p->tls_id || self->dtv[p->tls_id]) continue;
1081 mem = p->new_tls + (p->tls_size + p->tls_align)
1082 * a_fetch_add(&p->new_tls_idx,1);
1083 mem += ((uintptr_t)p->tls_image - (uintptr_t)mem)
1084 & (p->tls_align-1);
1085 self->dtv[p->tls_id] = mem;
1086 memcpy(mem, p->tls_image, p->tls_len);
1087 if (p->tls_id == v[0]) break;
1088 }
Rich Felker5ba238e2014-06-19 02:59:44 -04001089 __restore_sigs(&set);
Rich Felkerdcd60372012-10-05 11:51:50 -04001090 return mem + v[1];
Rich Felker9b153c02012-10-04 21:01:56 -04001091}
1092
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001093static void update_tls_size()
1094{
Rich Felker9ec42832012-10-15 18:51:53 -04001095 libc.tls_size = ALIGN(
1096 (1+tls_cnt) * sizeof(void *) +
1097 tls_offset +
1098 sizeof(struct pthread) +
1099 tls_align * 2,
1100 tls_align);
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001101}
1102
Rich Felkerc82f4a32012-01-23 00:57:38 -05001103void *__dynlink(int argc, char **argv)
Rich Felker51e2d832011-06-18 19:48:42 -04001104{
Rich Felker731e8ff2012-08-25 17:24:46 -04001105 size_t aux[AUX_CNT] = {0};
Rich Felker51e2d832011-06-18 19:48:42 -04001106 size_t i;
1107 Phdr *phdr;
Rich Felker6717e622011-06-28 19:40:14 -04001108 Ehdr *ehdr;
Rich Felker6ab444d2011-07-24 00:54:55 -04001109 static struct dso builtin_dsos[3];
Rich Felkera53de812011-07-24 00:26:12 -04001110 struct dso *const app = builtin_dsos+0;
1111 struct dso *const lib = builtin_dsos+1;
Rich Felker6ab444d2011-07-24 00:54:55 -04001112 struct dso *const vdso = builtin_dsos+2;
Rich Felker2719cc82011-08-16 00:24:36 -04001113 char *env_preload=0;
Rich Felkerdbcb3ad2012-08-25 17:31:59 -04001114 size_t vdso_base;
Rich Felker2f2f1152012-11-01 23:49:57 -04001115 size_t *auxv;
Rich Felker75863602013-07-21 03:00:54 -04001116 char **envp = argv+argc+1;
Rich Felkerdab441a2014-03-24 16:57:11 -04001117 void *initial_tls;
Rich Felker51e2d832011-06-18 19:48:42 -04001118
1119 /* Find aux vector just past environ[] */
Rich Felker568b8072011-06-25 01:56:34 -04001120 for (i=argc+1; argv[i]; i++)
1121 if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16))
1122 env_path = argv[i]+16;
Rich Felker2719cc82011-08-16 00:24:36 -04001123 else if (!memcmp(argv[i], "LD_PRELOAD=", 11))
1124 env_preload = argv[i]+11;
Rich Felker51e2d832011-06-18 19:48:42 -04001125 auxv = (void *)(argv+i+1);
1126
1127 decode_vec(auxv, aux, AUX_CNT);
1128
Rich Felker568b8072011-06-25 01:56:34 -04001129 /* Only trust user/env if kernel says we're not suid/sgid */
1130 if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID]
Rich Felkera0458832011-08-16 07:46:42 -04001131 || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) {
Rich Felker568b8072011-06-25 01:56:34 -04001132 env_path = 0;
Rich Felker2719cc82011-08-16 00:24:36 -04001133 env_preload = 0;
Rich Felkera897a202013-08-23 13:56:30 -04001134 libc.secure = 1;
Rich Felker568b8072011-06-25 01:56:34 -04001135 }
Szabolcs Nagyb20760c2013-09-15 02:00:32 +00001136 libc.page_size = aux[AT_PAGESZ];
Rich Felkerd8bdc972014-11-19 00:34:29 -05001137 libc.auxv = auxv;
Rich Felker568b8072011-06-25 01:56:34 -04001138
Rich Felker5c1909a2012-05-27 16:01:44 -04001139 /* If the dynamic linker was invoked as a program itself, AT_BASE
1140 * will not be set. In that case, we assume the base address is
1141 * the start of the page containing the PHDRs; I don't know any
1142 * better approach... */
1143 if (!aux[AT_BASE]) {
1144 aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE;
1145 aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0;
1146 }
1147
Rich Felkerc82f4a32012-01-23 00:57:38 -05001148 /* The dynamic linker load address is passed by the kernel
1149 * in the AUX vector, so this is easy. */
1150 lib->base = (void *)aux[AT_BASE];
Rich Felker5c1909a2012-05-27 16:01:44 -04001151 lib->name = lib->shortname = "libc.so";
Rich Felkerc82f4a32012-01-23 00:57:38 -05001152 lib->global = 1;
1153 ehdr = (void *)lib->base;
Rich Felker18c0e022012-10-31 21:27:48 -04001154 lib->phnum = ehdr->e_phnum;
1155 lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff);
Timo Teräs87691962014-03-25 20:59:50 +02001156 lib->phentsize = ehdr->e_phentsize;
1157 kernel_mapped_dso(lib);
Rich Felkerc82f4a32012-01-23 00:57:38 -05001158 decode_dyn(lib);
1159
Rich Felker5c1909a2012-05-27 16:01:44 -04001160 if (aux[AT_PHDR]) {
Rich Felker649cec52012-07-13 01:31:02 -04001161 size_t interp_off = 0;
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001162 size_t tls_image = 0;
Rich Felker5c1909a2012-05-27 16:01:44 -04001163 /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */
Rich Felker18c0e022012-10-31 21:27:48 -04001164 app->phdr = phdr = (void *)aux[AT_PHDR];
1165 app->phnum = aux[AT_PHNUM];
Timo Teräs87691962014-03-25 20:59:50 +02001166 app->phentsize = aux[AT_PHENT];
Rich Felker5c1909a2012-05-27 16:01:44 -04001167 for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) {
1168 if (phdr->p_type == PT_PHDR)
1169 app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr);
Rich Felker649cec52012-07-13 01:31:02 -04001170 else if (phdr->p_type == PT_INTERP)
1171 interp_off = (size_t)phdr->p_vaddr;
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001172 else if (phdr->p_type == PT_TLS) {
1173 tls_image = phdr->p_vaddr;
1174 app->tls_len = phdr->p_filesz;
1175 app->tls_size = phdr->p_memsz;
1176 app->tls_align = phdr->p_align;
1177 }
Rich Felker5c1909a2012-05-27 16:01:44 -04001178 }
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001179 if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
Rich Felker649cec52012-07-13 01:31:02 -04001180 if (interp_off) lib->name = (char *)app->base + interp_off;
Rich Felkercc515052013-08-23 14:14:47 -04001181 if ((aux[0] & (1UL<<AT_EXECFN))
1182 && strncmp((char *)aux[AT_EXECFN], "/proc/", 6))
1183 app->name = (char *)aux[AT_EXECFN];
1184 else
1185 app->name = argv[0];
Timo Teräs87691962014-03-25 20:59:50 +02001186 kernel_mapped_dso(app);
Rich Felker5c1909a2012-05-27 16:01:44 -04001187 } else {
1188 int fd;
1189 char *ldname = argv[0];
Rich Felkera617a8e2012-11-01 23:46:39 -04001190 size_t l = strlen(ldname);
Rich Felker5c1909a2012-05-27 16:01:44 -04001191 if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1;
1192 *argv++ = (void *)-1;
Rich Felkerde451642014-04-16 12:45:36 -04001193 while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') {
1194 char *opt = argv[0]+2;
1195 *argv++ = (void *)-1;
1196 if (!*opt) {
1197 break;
1198 } else if (!memcmp(opt, "list", 5)) {
1199 ldd_mode = 1;
1200 } else if (!memcmp(opt, "library-path", 12)) {
1201 if (opt[12]=='=') env_path = opt+13;
1202 else if (opt[12]) *argv = 0;
1203 else if (*argv) env_path = *argv++;
1204 } else if (!memcmp(opt, "preload", 7)) {
1205 if (opt[7]=='=') env_preload = opt+8;
1206 else if (opt[7]) *argv = 0;
1207 else if (*argv) env_preload = *argv++;
1208 } else {
1209 argv[0] = 0;
1210 }
1211 argv[-1] = (void *)-1;
1212 }
Rich Felker5c1909a2012-05-27 16:01:44 -04001213 if (!argv[0]) {
Rich Felker179ab5a2013-12-01 17:27:25 -05001214 dprintf(2, "musl libc\n"
1215 "Version %s\n"
1216 "Dynamic Program Loader\n"
Rich Felkerde451642014-04-16 12:45:36 -04001217 "Usage: %s [options] [--] pathname%s\n",
Rich Felker179ab5a2013-12-01 17:27:25 -05001218 __libc_get_version(), ldname,
Rich Felker5c1909a2012-05-27 16:01:44 -04001219 ldd_mode ? "" : " [args]");
1220 _exit(1);
1221 }
1222 fd = open(argv[0], O_RDONLY);
1223 if (fd < 0) {
1224 dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno));
1225 _exit(1);
1226 }
1227 runtime = 1;
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001228 ehdr = (void *)map_library(fd, app);
Rich Felker5c1909a2012-05-27 16:01:44 -04001229 if (!ehdr) {
1230 dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]);
1231 _exit(1);
1232 }
1233 runtime = 0;
1234 close(fd);
Rich Felker649cec52012-07-13 01:31:02 -04001235 lib->name = ldname;
Rich Felker0420b872012-07-11 01:41:20 -04001236 app->name = argv[0];
Rich Felker876748e2013-07-26 14:25:51 -04001237 aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry;
Rich Felkera97a0502013-07-26 14:41:12 -04001238 /* Find the name that would have been used for the dynamic
1239 * linker had ldd not taken its place. */
1240 if (ldd_mode) {
1241 for (i=0; i<app->phnum; i++) {
1242 if (app->phdr[i].p_type == PT_INTERP)
1243 lib->name = (void *)(app->base
1244 + app->phdr[i].p_vaddr);
1245 }
1246 dprintf(1, "\t%s (%p)\n", lib->name, lib->base);
1247 }
Rich Felkere12fe652012-01-23 02:02:59 -05001248 }
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001249 if (app->tls_size) {
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001250 app->tls_id = tls_cnt = 1;
Rich Felker9ec42832012-10-15 18:51:53 -04001251#ifdef TLS_ABOVE_TP
1252 app->tls_offset = 0;
1253 tls_offset = app->tls_size
1254 + ( -((uintptr_t)app->tls_image + app->tls_size)
1255 & (app->tls_align-1) );
1256#else
Rich Felkerc62b9f32012-10-14 19:56:50 -04001257 tls_offset = app->tls_offset = app->tls_size
1258 + ( -((uintptr_t)app->tls_image + app->tls_size)
1259 & (app->tls_align-1) );
Rich Felker9ec42832012-10-15 18:51:53 -04001260#endif
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001261 tls_align = MAXP2(tls_align, app->tls_align);
Rich Felkerbc6a35f2012-10-04 20:04:13 -04001262 }
Rich Felkerc82f4a32012-01-23 00:57:38 -05001263 app->global = 1;
Rich Felkerc82f4a32012-01-23 00:57:38 -05001264 decode_dyn(app);
1265
1266 /* Attach to vdso, if provided by the kernel */
Rich Felkerdbcb3ad2012-08-25 17:31:59 -04001267 if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) {
Rich Felker6ab444d2011-07-24 00:54:55 -04001268 ehdr = (void *)vdso_base;
Rich Felker18c0e022012-10-31 21:27:48 -04001269 vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff);
1270 vdso->phnum = ehdr->e_phnum;
Timo Teräs87691962014-03-25 20:59:50 +02001271 vdso->phentsize = ehdr->e_phentsize;
Rich Felker6ab444d2011-07-24 00:54:55 -04001272 for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) {
1273 if (phdr->p_type == PT_DYNAMIC)
1274 vdso->dynv = (void *)(vdso_base + phdr->p_offset);
1275 if (phdr->p_type == PT_LOAD)
1276 vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset);
1277 }
Rich Felker75a31fa2012-11-25 20:56:31 -05001278 vdso->name = "";
1279 vdso->shortname = "linux-gate.so.1";
Rich Felker427173b2011-07-24 02:19:47 -04001280 vdso->global = 1;
Rich Felkerc82f4a32012-01-23 00:57:38 -05001281 decode_dyn(vdso);
Rich Felker6ab444d2011-07-24 00:54:55 -04001282 vdso->prev = lib;
1283 lib->next = vdso;
1284 }
1285
Rich Felkerc82f4a32012-01-23 00:57:38 -05001286 /* Initial dso chain consists only of the app. We temporarily
1287 * append the dynamic linker/libc so we can relocate it, then
1288 * restore the initial chain in preparation for loading third
1289 * party libraries (preload/needed). */
1290 head = tail = app;
Rich Felkere23d3582012-10-13 23:25:20 -04001291 ldso = lib;
Rich Felkerc82f4a32012-01-23 00:57:38 -05001292 app->next = lib;
1293 reloc_all(lib);
1294 app->next = 0;
Rich Felker51e2d832011-06-18 19:48:42 -04001295
Rich Felkerc82f4a32012-01-23 00:57:38 -05001296 /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */
Rich Felker51e2d832011-06-18 19:48:42 -04001297
Rich Felkerc82f4a32012-01-23 00:57:38 -05001298 /* Donate unused parts of app and library mapping to malloc */
Timo Teräs87691962014-03-25 20:59:50 +02001299 reclaim_gaps(app);
1300 reclaim_gaps(lib);
Rich Felker6717e622011-06-28 19:40:14 -04001301
Rich Felkerc82f4a32012-01-23 00:57:38 -05001302 /* Load preload/needed libraries, add their symbols to the global
Rich Felkerfd7015d2012-01-23 18:32:40 -05001303 * namespace, and perform all remaining relocations. The main
1304 * program must be relocated LAST since it may contain copy
1305 * relocations which depend on libraries' relocations. */
Rich Felker2719cc82011-08-16 00:24:36 -04001306 if (env_preload) load_preload(env_preload);
Rich Felkerc82f4a32012-01-23 00:57:38 -05001307 load_deps(app);
1308 make_global(app);
Rich Felker9c748562012-10-04 22:48:33 -04001309
Timo Teräse13a2b82014-03-25 14:13:27 +02001310#ifndef DYNAMIC_IS_RO
1311 for (i=0; app->dynv[i]; i+=2)
1312 if (app->dynv[i]==DT_DEBUG)
1313 app->dynv[i+1] = (size_t)&debug;
1314#endif
1315
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001316 reloc_all(app->next);
1317 reloc_all(app);
1318
1319 update_tls_size();
Rich Felkerdab441a2014-03-24 16:57:11 -04001320 if (libc.tls_size > sizeof builtin_tls) {
1321 initial_tls = calloc(libc.tls_size, 1);
1322 if (!initial_tls) {
Rich Felker9c748562012-10-04 22:48:33 -04001323 dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n",
Rich Felkere23d3582012-10-13 23:25:20 -04001324 argv[0], libc.tls_size);
Rich Felker9c748562012-10-04 22:48:33 -04001325 _exit(127);
1326 }
Rich Felkerdab441a2014-03-24 16:57:11 -04001327 } else {
1328 initial_tls = builtin_tls;
1329 }
1330 if (__init_tp(__copy_tls(initial_tls)) < 0 && tls_cnt) {
1331 dprintf(2, "%s: Thread-local storage not supported by kernel.\n", argv[0]);
1332 _exit(127);
Rich Felker9c748562012-10-04 22:48:33 -04001333 }
Rich Felker9d15d5e2014-06-19 02:01:06 -04001334 static_tls_cnt = tls_cnt;
Rich Felker9c748562012-10-04 22:48:33 -04001335
Rich Felker04109502012-08-18 16:00:23 -04001336 if (ldso_fail) _exit(127);
Rich Felker5c1909a2012-05-27 16:01:44 -04001337 if (ldd_mode) _exit(0);
1338
Rich Felkerc82f4a32012-01-23 00:57:38 -05001339 /* Switch to runtime mode: any further failures in the dynamic
1340 * linker are a reportable failure rather than a fatal startup
1341 * error. If the dynamic loader (dlopen) will not be used, free
1342 * all memory used by the dynamic linker. */
Rich Felkera53de812011-07-24 00:26:12 -04001343 runtime = 1;
Rich Felker4ce3cb52012-02-06 14:39:09 -05001344
Rich Felker3ec8d292012-04-25 00:05:42 -04001345 debug.ver = 1;
1346 debug.bp = _dl_debug_state;
1347 debug.head = head;
1348 debug.base = lib->base;
1349 debug.state = 0;
1350 _dl_debug_state();
1351
Rich Felker75863602013-07-21 03:00:54 -04001352 __init_libc(envp, argv[0]);
Rich Felkera7936f62012-11-30 17:56:23 -05001353 atexit(do_fini);
Rich Felker75863602013-07-21 03:00:54 -04001354 errno = 0;
Rich Felkera7936f62012-11-30 17:56:23 -05001355 do_init_fini(tail);
Rich Felker75863602013-07-21 03:00:54 -04001356
1357 return (void *)aux[AT_ENTRY];
Rich Felkera7936f62012-11-30 17:56:23 -05001358}
1359
Rich Felker59ab43f2011-06-26 19:23:28 -04001360void *dlopen(const char *file, int mode)
1361{
Rich Felker642b7592012-10-05 01:15:25 -04001362 struct dso *volatile p, *orig_tail, *next;
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001363 size_t orig_tls_cnt, orig_tls_offset, orig_tls_align;
Rich Felker59ab43f2011-06-26 19:23:28 -04001364 size_t i;
Rich Felkerf2baf4d2012-02-07 20:31:27 -05001365 int cs;
Rich Felker17276be2013-07-24 02:38:05 -04001366 jmp_buf jb;
Rich Felker59ab43f2011-06-26 19:23:28 -04001367
1368 if (!file) return head;
1369
Rich Felkerf2baf4d2012-02-07 20:31:27 -05001370 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
Rich Felker59ab43f2011-06-26 19:23:28 -04001371 pthread_rwlock_wrlock(&lock);
Rich Felkerdcd60372012-10-05 11:51:50 -04001372 __inhibit_ptc();
Rich Felker59ab43f2011-06-26 19:23:28 -04001373
Rich Felkerdcd60372012-10-05 11:51:50 -04001374 p = 0;
1375 orig_tls_cnt = tls_cnt;
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001376 orig_tls_offset = tls_offset;
1377 orig_tls_align = tls_align;
Rich Felker642b7592012-10-05 01:15:25 -04001378 orig_tail = tail;
Rich Felker4d07e552013-01-23 22:07:45 -05001379 noload = mode & RTLD_NOLOAD;
Rich Felker642b7592012-10-05 01:15:25 -04001380
Rich Felker17276be2013-07-24 02:38:05 -04001381 rtld_fail = &jb;
1382 if (setjmp(*rtld_fail)) {
Rich Felker59ab43f2011-06-26 19:23:28 -04001383 /* Clean up anything new that was (partially) loaded */
Rich Felkerdcd60372012-10-05 11:51:50 -04001384 if (p && p->deps) for (i=0; p->deps[i]; i++)
Rich Felker92ab5d82011-06-26 21:21:04 -04001385 if (p->deps[i]->global < 0)
1386 p->deps[i]->global = 0;
Rich Felker59ab43f2011-06-26 19:23:28 -04001387 for (p=orig_tail->next; p; p=next) {
1388 next = p->next;
1389 munmap(p->map, p->map_len);
Rich Felker9d15d5e2014-06-19 02:01:06 -04001390 while (p->td_index) {
1391 void *tmp = p->td_index->next;
1392 free(p->td_index);
1393 p->td_index = tmp;
1394 }
Rich Felker59ab43f2011-06-26 19:23:28 -04001395 free(p->deps);
1396 free(p);
1397 }
Rich Felkerdcd60372012-10-05 11:51:50 -04001398 tls_cnt = orig_tls_cnt;
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001399 tls_offset = orig_tls_offset;
1400 tls_align = orig_tls_align;
Rich Felker59ab43f2011-06-26 19:23:28 -04001401 tail = orig_tail;
1402 tail->next = 0;
Rich Felkerf2baf4d2012-02-07 20:31:27 -05001403 p = 0;
Rich Felkera5d10eb2012-04-23 12:03:31 -04001404 errflag = 1;
1405 goto end;
Rich Felker0f9b1f62013-08-23 23:13:25 -04001406 } else p = load_library(file, head);
Rich Felkera9e85c02012-03-23 00:28:20 -04001407
1408 if (!p) {
Rich Felker4d07e552013-01-23 22:07:45 -05001409 snprintf(errbuf, sizeof errbuf, noload ?
1410 "Library %s is not already loaded" :
1411 "Error loading shared library %s: %m",
1412 file);
Rich Felkera9e85c02012-03-23 00:28:20 -04001413 errflag = 1;
Rich Felkerf2baf4d2012-02-07 20:31:27 -05001414 goto end;
Rich Felker59ab43f2011-06-26 19:23:28 -04001415 }
1416
Rich Felker59ab43f2011-06-26 19:23:28 -04001417 /* First load handling */
1418 if (!p->deps) {
1419 load_deps(p);
Rich Felker0e4dae32011-06-26 21:36:44 -04001420 if (p->deps) for (i=0; p->deps[i]; i++)
Rich Felker92ab5d82011-06-26 21:21:04 -04001421 if (!p->deps[i]->global)
1422 p->deps[i]->global = -1;
1423 if (!p->global) p->global = -1;
Rich Felker59ab43f2011-06-26 19:23:28 -04001424 reloc_all(p);
Rich Felker0e4dae32011-06-26 21:36:44 -04001425 if (p->deps) for (i=0; p->deps[i]; i++)
Rich Felker92ab5d82011-06-26 21:21:04 -04001426 if (p->deps[i]->global < 0)
1427 p->deps[i]->global = 0;
1428 if (p->global < 0) p->global = 0;
Rich Felker59ab43f2011-06-26 19:23:28 -04001429 }
1430
1431 if (mode & RTLD_GLOBAL) {
Rich Felker0e4dae32011-06-26 21:36:44 -04001432 if (p->deps) for (i=0; p->deps[i]; i++)
Rich Felker59ab43f2011-06-26 19:23:28 -04001433 p->deps[i]->global = 1;
1434 p->global = 1;
1435 }
1436
Rich Felkercf3fd3d2012-10-06 01:22:51 -04001437 update_tls_size();
Rich Felker3ec8d292012-04-25 00:05:42 -04001438 _dl_debug_state();
Rich Felkerf4f77c02012-10-05 13:09:09 -04001439 orig_tail = tail;
Rich Felker06933cc2011-06-26 22:09:32 -04001440end:
Rich Felkerdcd60372012-10-05 11:51:50 -04001441 __release_ptc();
Rich Felker18c0e022012-10-31 21:27:48 -04001442 if (p) gencnt++;
Rich Felker59ab43f2011-06-26 19:23:28 -04001443 pthread_rwlock_unlock(&lock);
Rich Felkerf4f77c02012-10-05 13:09:09 -04001444 if (p) do_init_fini(orig_tail);
Rich Felkerf2baf4d2012-02-07 20:31:27 -05001445 pthread_setcancelstate(cs, 0);
Rich Felker59ab43f2011-06-26 19:23:28 -04001446 return p;
1447}
1448
Rich Felker4d982802013-01-16 11:49:00 -05001449static int invalid_dso_handle(void *h)
Rich Felker6468fc92013-01-10 14:05:40 -05001450{
1451 struct dso *p;
1452 for (p=head; p; p=p->next) if (h==p) return 0;
1453 snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1454 errflag = 1;
1455 return 1;
1456}
1457
Rich Felker5ba238e2014-06-19 02:59:44 -04001458void *__tls_get_addr(size_t *);
1459
Rich Felker623753a2011-08-16 00:42:13 -04001460static void *do_dlsym(struct dso *p, const char *s, void *ra)
Rich Felker59ab43f2011-06-26 19:23:28 -04001461{
1462 size_t i;
Rich Felker2bd05a42012-08-25 17:13:28 -04001463 uint32_t h = 0, gh = 0;
Rich Felker59ab43f2011-06-26 19:23:28 -04001464 Sym *sym;
Rich Felker9c748562012-10-04 22:48:33 -04001465 if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) {
Rich Felkerdeb15b32012-10-19 21:41:30 -04001466 if (p == RTLD_DEFAULT) {
1467 p = head;
1468 } else if (p == RTLD_NEXT) {
Rich Felker9c748562012-10-04 22:48:33 -04001469 for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next);
1470 if (!p) p=head;
Rich Felkerdeb15b32012-10-19 21:41:30 -04001471 p = p->next;
Rich Felker9c748562012-10-04 22:48:33 -04001472 }
Rich Felkerdeb15b32012-10-19 21:41:30 -04001473 struct symdef def = find_sym(p, s, 0);
Rich Felker9c748562012-10-04 22:48:33 -04001474 if (!def.sym) goto failed;
Rich Felker0a1c2c12012-10-19 21:57:56 -04001475 if ((def.sym->st_info&0xf) == STT_TLS)
1476 return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value});
Rich Felker9c748562012-10-04 22:48:33 -04001477 return def.dso->base + def.sym->st_value;
Rich Felkera9e85c02012-03-23 00:28:20 -04001478 }
Rich Felker637dd2d2013-01-23 20:21:36 -05001479 if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p))
1480 return 0;
Rich Felker2bd05a42012-08-25 17:13:28 -04001481 if (p->ghashtab) {
1482 gh = gnu_hash(s);
1483 sym = gnu_lookup(s, gh, p);
1484 } else {
1485 h = sysv_hash(s);
1486 sym = sysv_lookup(s, h, p);
1487 }
Rich Felker0a1c2c12012-10-19 21:57:56 -04001488 if (sym && (sym->st_info&0xf) == STT_TLS)
1489 return __tls_get_addr((size_t []){p->tls_id, sym->st_value});
Rich Felker59ab43f2011-06-26 19:23:28 -04001490 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1491 return p->base + sym->st_value;
1492 if (p->deps) for (i=0; p->deps[i]; i++) {
Rich Felker2bd05a42012-08-25 17:13:28 -04001493 if (p->deps[i]->ghashtab) {
1494 if (!gh) gh = gnu_hash(s);
Rich Felkera5d61992012-08-25 17:40:27 -04001495 sym = gnu_lookup(s, gh, p->deps[i]);
Rich Felker2bd05a42012-08-25 17:13:28 -04001496 } else {
1497 if (!h) h = sysv_hash(s);
1498 sym = sysv_lookup(s, h, p->deps[i]);
1499 }
Rich Felker0a1c2c12012-10-19 21:57:56 -04001500 if (sym && (sym->st_info&0xf) == STT_TLS)
1501 return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value});
Rich Felker59ab43f2011-06-26 19:23:28 -04001502 if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES))
1503 return p->deps[i]->base + sym->st_value;
1504 }
Rich Felker4027f4e2012-05-04 20:18:18 -04001505failed:
Rich Felkera9e85c02012-03-23 00:28:20 -04001506 errflag = 1;
Rich Felkera5d10eb2012-04-23 12:03:31 -04001507 snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
Rich Felker59ab43f2011-06-26 19:23:28 -04001508 return 0;
1509}
1510
Rich Felker839cc4e2014-01-06 22:03:38 -05001511int __dladdr(const void *addr, Dl_info *info)
Rich Felkerf419bcb2012-08-26 21:09:26 -04001512{
1513 struct dso *p;
1514 Sym *sym;
1515 uint32_t nsym;
1516 char *strings;
1517 size_t i;
1518 void *best = 0;
1519 char *bestname;
1520
1521 pthread_rwlock_rdlock(&lock);
1522 for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next);
1523 pthread_rwlock_unlock(&lock);
1524
1525 if (!p) return 0;
1526
1527 sym = p->syms;
1528 strings = p->strings;
1529 if (p->hashtab) {
1530 nsym = p->hashtab[1];
1531 } else {
1532 uint32_t *buckets;
1533 uint32_t *hashval;
1534 buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4);
1535 sym += p->ghashtab[1];
Rich Felker78869852013-10-04 00:29:58 -04001536 for (i = nsym = 0; i < p->ghashtab[0]; i++) {
Rich Felkerf419bcb2012-08-26 21:09:26 -04001537 if (buckets[i] > nsym)
1538 nsym = buckets[i];
1539 }
1540 if (nsym) {
1541 nsym -= p->ghashtab[1];
1542 hashval = buckets + p->ghashtab[0] + nsym;
1543 do nsym++;
1544 while (!(*hashval++ & 1));
1545 }
1546 }
1547
1548 for (; nsym; nsym--, sym++) {
Rich Felkercdc5c742013-01-16 11:47:35 -05001549 if (sym->st_value
Rich Felkerf419bcb2012-08-26 21:09:26 -04001550 && (1<<(sym->st_info&0xf) & OK_TYPES)
1551 && (1<<(sym->st_info>>4) & OK_BINDS)) {
1552 void *symaddr = p->base + sym->st_value;
1553 if (symaddr > addr || symaddr < best)
1554 continue;
1555 best = symaddr;
1556 bestname = strings + sym->st_name;
1557 if (addr == symaddr)
1558 break;
1559 }
1560 }
1561
1562 if (!best) return 0;
1563
1564 info->dli_fname = p->name;
1565 info->dli_fbase = p->base;
1566 info->dli_sname = bestname;
1567 info->dli_saddr = best;
1568
1569 return 1;
1570}
1571
Rich Felker400c5e52012-09-06 22:44:55 -04001572void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
Rich Felker59ab43f2011-06-26 19:23:28 -04001573{
1574 void *res;
1575 pthread_rwlock_rdlock(&lock);
Rich Felker623753a2011-08-16 00:42:13 -04001576 res = do_dlsym(p, s, ra);
Rich Felker59ab43f2011-06-26 19:23:28 -04001577 pthread_rwlock_unlock(&lock);
1578 return res;
1579}
Rich Felker18c0e022012-10-31 21:27:48 -04001580
1581int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
1582{
1583 struct dso *current;
1584 struct dl_phdr_info info;
1585 int ret = 0;
1586 for(current = head; current;) {
1587 info.dlpi_addr = (uintptr_t)current->base;
1588 info.dlpi_name = current->name;
1589 info.dlpi_phdr = current->phdr;
1590 info.dlpi_phnum = current->phnum;
1591 info.dlpi_adds = gencnt;
1592 info.dlpi_subs = 0;
1593 info.dlpi_tls_modid = current->tls_id;
1594 info.dlpi_tls_data = current->tls_image;
1595
1596 ret = (callback)(&info, sizeof (info), data);
1597
1598 if (ret != 0) break;
1599
1600 pthread_rwlock_rdlock(&lock);
1601 current = current->next;
1602 pthread_rwlock_unlock(&lock);
1603 }
1604 return ret;
1605}
Rich Felker5a09a532012-02-03 03:16:07 -05001606#else
Rich Felker4d982802013-01-16 11:49:00 -05001607static int invalid_dso_handle(void *h)
Rich Felker6468fc92013-01-10 14:05:40 -05001608{
1609 snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h);
1610 errflag = 1;
1611 return 1;
1612}
Rich Felker5a09a532012-02-03 03:16:07 -05001613void *dlopen(const char *file, int mode)
1614{
Clément Vasseurdc65fdd2014-08-07 17:49:29 +02001615 strcpy(errbuf, "Dynamic loading not supported");
1616 errflag = 1;
Rich Felker5a09a532012-02-03 03:16:07 -05001617 return 0;
1618}
Rich Felker400c5e52012-09-06 22:44:55 -04001619void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra)
Rich Felker5a09a532012-02-03 03:16:07 -05001620{
Rich Felker4fe57ca2014-08-08 00:53:27 -04001621 errflag = 1;
1622 snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s);
Rich Felker5a09a532012-02-03 03:16:07 -05001623 return 0;
1624}
Rich Felker839cc4e2014-01-06 22:03:38 -05001625int __dladdr (const void *addr, Dl_info *info)
Rich Felkerf419bcb2012-08-26 21:09:26 -04001626{
1627 return 0;
1628}
Rich Felker5a09a532012-02-03 03:16:07 -05001629#endif
Rich Felker59ab43f2011-06-26 19:23:28 -04001630
Rich Felker780cbbe2013-06-29 12:46:46 -04001631int __dlinfo(void *dso, int req, void *res)
1632{
1633 if (invalid_dso_handle(dso)) return -1;
1634 if (req != RTLD_DI_LINKMAP) {
1635 snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req);
1636 errflag = 1;
1637 return -1;
1638 }
1639 *(struct link_map **)res = dso;
1640 return 0;
1641}
1642
Rich Felker59ab43f2011-06-26 19:23:28 -04001643char *dlerror()
1644{
Rich Felkera9e85c02012-03-23 00:28:20 -04001645 if (!errflag) return 0;
1646 errflag = 0;
Rich Felkera5d10eb2012-04-23 12:03:31 -04001647 return errbuf;
Rich Felker59ab43f2011-06-26 19:23:28 -04001648}
1649
1650int dlclose(void *p)
1651{
Rich Felker6468fc92013-01-10 14:05:40 -05001652 return invalid_dso_handle(p);
Rich Felker59ab43f2011-06-26 19:23:28 -04001653}