Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1 | #define _GNU_SOURCE |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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> |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 16 | #include <link.h> |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 17 | #include <setjmp.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 18 | #include <pthread.h> |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 19 | #include <ctype.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 20 | #include <dlfcn.h> |
Rich Felker | 8431d79 | 2012-10-04 16:35:46 -0400 | [diff] [blame] | 21 | #include "pthread_impl.h" |
| 22 | #include "libc.h" |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 23 | |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 24 | static int errflag; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 25 | static char errbuf[128]; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 26 | |
Rich Felker | e864a29 | 2012-07-11 01:47:30 -0400 | [diff] [blame] | 27 | #ifdef SHARED |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 28 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 43 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 44 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 45 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 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; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 57 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 58 | struct dso *next, *prev; |
| 59 | |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 60 | Phdr *phdr; |
| 61 | int phnum; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 62 | int refcnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 63 | Sym *syms; |
Rich Felker | 596d60c | 2011-06-18 22:52:01 -0400 | [diff] [blame] | 64 | uint32_t *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 65 | uint32_t *ghashtab; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 66 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 67 | unsigned char *map; |
| 68 | size_t map_len; |
| 69 | dev_t dev; |
| 70 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 71 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 72 | char relocated; |
| 73 | char constructed; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 74 | struct dso **deps; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 75 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 76 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 77 | void **new_dtv; |
| 78 | unsigned char *new_tls; |
| 79 | int new_dtv_idx, new_tls_idx; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 80 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 81 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 82 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 83 | }; |
| 84 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 85 | struct symdef { |
| 86 | Sym *sym; |
| 87 | struct dso *dso; |
| 88 | }; |
| 89 | |
Rich Felker | 59f4086 | 2012-08-05 13:46:39 -0400 | [diff] [blame] | 90 | #include "reloc.h" |
| 91 | |
Rich Felker | 58aa5f4 | 2012-05-03 20:42:45 -0400 | [diff] [blame] | 92 | void __init_ssp(size_t *); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 93 | void *__install_initial_tls(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 94 | void __init_libc(char **, char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 95 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 96 | static struct dso *head, *tail, *ldso, *fini_head; |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 97 | static char *env_path, *sys_path, *r_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 98 | static unsigned long long gencnt; |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 99 | static int ssp_used; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 100 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 101 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 102 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 103 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 104 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 105 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 106 | static struct debug debug; |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 107 | static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 108 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 109 | |
| 110 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 111 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 112 | #define AUX_CNT 38 |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 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) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 133 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 134 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 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) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 153 | { |
| 154 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 155 | Sym *syms = dso->syms; |
| 156 | uint32_t *hashtab = dso->hashtab; |
| 157 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 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 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 192 | #define OK_TYPES (1<<STT_NOTYPE | 1<<STT_OBJECT | 1<<STT_FUNC | 1<<STT_COMMON | 1<<STT_TLS) |
Rich Felker | e152ee9 | 2013-07-24 11:53:23 -0400 | [diff] [blame] | 193 | #define OK_BINDS (1<<STB_GLOBAL | 1<<STB_WEAK | 1<<STB_GNU_UNIQUE) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 194 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 195 | static struct symdef find_sym(struct dso *dso, const char *s, int need_def) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 196 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 197 | uint32_t h = 0, gh = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 198 | struct symdef def = {0}; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 199 | if (dso->ghashtab) { |
| 200 | gh = gnu_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 201 | if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 202 | } else { |
| 203 | h = sysv_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 204 | if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 205 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 206 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 207 | Sym *sym; |
| 208 | if (!dso->global) continue; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 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 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 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; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 230 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 231 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 232 | } |
| 233 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 234 | static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stride) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 235 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 236 | unsigned char *base = dso->base; |
| 237 | Sym *syms = dso->syms; |
| 238 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 239 | Sym *sym; |
| 240 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 241 | void *ctx; |
| 242 | int type; |
| 243 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 244 | struct symdef def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 245 | |
| 246 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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; |
Rich Felker | 7cb44cd | 2012-08-05 02:44:32 -0400 | [diff] [blame] | 252 | ctx = IS_COPY(type) ? head->next : head; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 253 | def = find_sym(ctx, name, IS_PLT(type)); |
| 254 | if (!def.sym && sym->st_info>>4 != STB_WEAK) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 255 | snprintf(errbuf, sizeof errbuf, |
| 256 | "Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 257 | dso->name, name); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 258 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 259 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 260 | ldso_fail = 1; |
| 261 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 262 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 263 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 264 | sym = 0; |
| 265 | def.sym = 0; |
| 266 | def.dso = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 267 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 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); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 271 | } |
| 272 | } |
| 273 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 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 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 305 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 306 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 307 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 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; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 313 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 314 | unsigned prot; |
| 315 | unsigned char *map, *base; |
| 316 | size_t dyn; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 317 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 318 | size_t i; |
| 319 | |
| 320 | ssize_t l = read(fd, buf, sizeof buf); |
| 321 | if (l<sizeof *eh) return 0; |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 322 | eh = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 323 | phsize = eh->e_phentsize * eh->e_phnum; |
| 324 | if (phsize + sizeof *eh > l) return 0; |
| 325 | if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 326 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 327 | if (l != phsize) return 0; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 328 | ph = ph0 = (void *)(buf + 1); |
| 329 | } else { |
| 330 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 331 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 332 | for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
| 333 | if (ph->p_type == PT_DYNAMIC) |
| 334 | dyn = ph->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 335 | if (ph->p_type == PT_TLS) { |
| 336 | tls_image = ph->p_vaddr; |
| 337 | dso->tls_align = ph->p_align; |
| 338 | dso->tls_len = ph->p_filesz; |
| 339 | dso->tls_size = ph->p_memsz; |
| 340 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 341 | if (ph->p_type != PT_LOAD) continue; |
| 342 | if (ph->p_vaddr < addr_min) { |
| 343 | addr_min = ph->p_vaddr; |
| 344 | off_start = ph->p_offset; |
| 345 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 346 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 347 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 348 | } |
| 349 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 350 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 351 | } |
| 352 | } |
| 353 | if (!dyn) return 0; |
| 354 | addr_max += PAGE_SIZE-1; |
| 355 | addr_max &= -PAGE_SIZE; |
| 356 | addr_min &= -PAGE_SIZE; |
| 357 | off_start &= -PAGE_SIZE; |
| 358 | map_len = addr_max - addr_min + off_start; |
| 359 | /* The first time, we map too much, possibly even more than |
| 360 | * the length of the file. This is okay because we will not |
| 361 | * use the invalid part; we just need to reserve the right |
| 362 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 363 | map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 364 | if (map==MAP_FAILED) return 0; |
| 365 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 366 | dso->phdr = 0; |
| 367 | dso->phnum = 0; |
| 368 | for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 369 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 370 | /* Check if the programs headers are in this load segment, and |
| 371 | * if so, record the address for use by dl_iterate_phdr. */ |
| 372 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 373 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 374 | dso->phdr = (void *)(base + ph->p_vaddr |
| 375 | + (eh->e_phoff-ph->p_offset)); |
| 376 | dso->phnum = eh->e_phnum; |
| 377 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 378 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 379 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 380 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 381 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 382 | off_start = ph->p_offset & -PAGE_SIZE; |
| 383 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 384 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 385 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 386 | if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
| 387 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 388 | if (ph->p_memsz > ph->p_filesz) { |
| 389 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 390 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 391 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 392 | 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) |
| 393 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 394 | } |
| 395 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 396 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 397 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 398 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0) |
| 399 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 400 | break; |
| 401 | } |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 402 | if (!runtime) reclaim_gaps(base, ph0, eh->e_phentsize, eh->e_phnum); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 403 | dso->map = map; |
| 404 | dso->map_len = map_len; |
| 405 | dso->base = base; |
| 406 | dso->dynv = (void *)(base+dyn); |
| 407 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 408 | return map; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 409 | error: |
| 410 | munmap(map, map_len); |
| 411 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 412 | } |
| 413 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 414 | static int path_open(const char *name, const char *s, char *buf, size_t buf_size) |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 415 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 416 | size_t l; |
| 417 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 418 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 419 | s += strspn(s, ":\n"); |
| 420 | l = strcspn(s, ":\n"); |
| 421 | if (l-1 >= INT_MAX) return -1; |
| 422 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size) |
| 423 | continue; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 424 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 425 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 426 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 427 | } |
| 428 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 429 | static void decode_dyn(struct dso *p) |
| 430 | { |
| 431 | size_t dyn[DYN_CNT] = {0}; |
| 432 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 433 | p->syms = (void *)(p->base + dyn[DT_SYMTAB]); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 434 | p->strings = (void *)(p->base + dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 435 | if (dyn[0]&(1<<DT_HASH)) |
| 436 | p->hashtab = (void *)(p->base + dyn[DT_HASH]); |
| 437 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
| 438 | p->ghashtab = (void *)(p->base + *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 439 | } |
| 440 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 441 | static struct dso *load_library(const char *name) |
| 442 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 443 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 444 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 445 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 446 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 447 | int fd; |
| 448 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 449 | size_t alloc_size; |
| 450 | int n_th = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 451 | |
| 452 | /* Catch and block attempts to reload the implementation itself */ |
| 453 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 454 | static const char *rp, reserved[] = |
| 455 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 456 | char *z = strchr(name, '.'); |
| 457 | if (z) { |
| 458 | size_t l = z-name; |
| 459 | for (rp=reserved; *rp && memcmp(name+3, rp, l-3); rp+=strlen(rp)+1); |
| 460 | if (*rp) { |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 461 | if (ldd_mode) { |
| 462 | /* Track which names have been resolved |
| 463 | * and only report each one once. */ |
| 464 | static unsigned reported; |
| 465 | unsigned mask = 1U<<(rp-reserved); |
| 466 | if (!(reported & mask)) { |
| 467 | reported |= mask; |
| 468 | dprintf(1, "\t%s => %s (%p)\n", |
| 469 | name, ldso->name, |
| 470 | ldso->base); |
| 471 | } |
| 472 | } |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 473 | if (!ldso->prev) { |
| 474 | tail->next = ldso; |
| 475 | ldso->prev = tail; |
| 476 | tail = ldso->next ? ldso->next : ldso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 477 | } |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 478 | return ldso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 479 | } |
| 480 | } |
| 481 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 482 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 483 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 484 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 485 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 486 | /* Search for the name to see if it's already loaded */ |
| 487 | for (p=head->next; p; p=p->next) { |
| 488 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 489 | p->refcnt++; |
| 490 | return p; |
| 491 | } |
| 492 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 493 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 494 | fd = -1; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 495 | if (r_path) fd = path_open(name, r_path, buf, sizeof buf); |
| 496 | if (fd < 0 && env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 497 | if (fd < 0) { |
| 498 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 499 | char *prefix = 0; |
| 500 | size_t prefix_len; |
| 501 | if (ldso->name[0]=='/') { |
| 502 | char *s, *t, *z; |
| 503 | for (s=t=z=ldso->name; *s; s++) |
| 504 | if (*s=='/') z=t, t=s; |
| 505 | prefix_len = z-ldso->name; |
| 506 | if (prefix_len < PATH_MAX) |
| 507 | prefix = ldso->name; |
| 508 | } |
| 509 | if (!prefix) { |
| 510 | prefix = ""; |
| 511 | prefix_len = 0; |
| 512 | } |
| 513 | char etc_ldso_path[prefix_len + 1 |
| 514 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 515 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 516 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 517 | (int)prefix_len, prefix); |
| 518 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 519 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 520 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 521 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 522 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 523 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 524 | fclose(f); |
| 525 | } |
| 526 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 527 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 528 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 529 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 530 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 531 | } |
| 532 | if (fd < 0) return 0; |
| 533 | if (fstat(fd, &st) < 0) { |
| 534 | close(fd); |
| 535 | return 0; |
| 536 | } |
| 537 | for (p=head->next; p; p=p->next) { |
| 538 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 539 | /* If this library was previously loaded with a |
| 540 | * pathname but a search found the same inode, |
| 541 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 542 | if (!p->shortname && pathname != name) |
| 543 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 544 | close(fd); |
| 545 | p->refcnt++; |
| 546 | return p; |
| 547 | } |
| 548 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 549 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 550 | close(fd); |
| 551 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 552 | |
| 553 | /* Allocate storage for the new DSO. When there is TLS, this |
| 554 | * storage must include a reservation for all pre-existing |
| 555 | * threads to obtain copies of both the new TLS, and an |
| 556 | * extended DTV capable of storing an additional slot for |
| 557 | * the newly-loaded DSO. */ |
| 558 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 559 | if (runtime && temp_dso.tls_image) { |
| 560 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 561 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 562 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 563 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 564 | else alloc_size += n_th * per_th; |
| 565 | } |
| 566 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 567 | if (!p) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 568 | munmap(map, temp_dso.map_len); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 569 | return 0; |
| 570 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 571 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 572 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 573 | p->dev = st.st_dev; |
| 574 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 575 | p->refcnt = 1; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 576 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 577 | strcpy(p->name, pathname); |
| 578 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 579 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 580 | if (p->tls_image) { |
Rich Felker | 017bf14 | 2012-10-07 20:19:11 -0400 | [diff] [blame] | 581 | if (runtime && !__pthread_self_init()) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 582 | munmap(map, p->map_len); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 583 | free(p); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 584 | return 0; |
| 585 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 586 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 587 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 588 | #ifdef TLS_ABOVE_TP |
| 589 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 590 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 591 | tls_offset += p->tls_size; |
| 592 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 593 | tls_offset += p->tls_size + p->tls_align - 1; |
| 594 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 595 | & (p->tls_align-1); |
| 596 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 597 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 598 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 599 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 600 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 601 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 602 | |
| 603 | tail->next = p; |
| 604 | p->prev = tail; |
| 605 | tail = p; |
| 606 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 607 | if (ldd_mode) dprintf(1, "\t%s => %s (%p)\n", name, pathname, p->base); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 608 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 609 | return p; |
| 610 | } |
| 611 | |
| 612 | static void load_deps(struct dso *p) |
| 613 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 614 | size_t i, ndeps=0; |
| 615 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 616 | for (; p; p=p->next) { |
| 617 | for (i=0; p->dynv[i]; i+=2) { |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 618 | if (p->dynv[i] != DT_RPATH) continue; |
| 619 | r_path = (void *)(p->strings + p->dynv[i+1]); |
| 620 | } |
| 621 | for (i=0; p->dynv[i]; i+=2) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 622 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 623 | dep = load_library(p->strings + p->dynv[i+1]); |
| 624 | if (!dep) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 625 | snprintf(errbuf, sizeof errbuf, |
| 626 | "Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 627 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 628 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 629 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 630 | ldso_fail = 1; |
| 631 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 632 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 633 | if (runtime) { |
| 634 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 635 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 636 | tmp[ndeps++] = dep; |
| 637 | tmp[ndeps] = 0; |
| 638 | *deps = tmp; |
| 639 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 640 | } |
Rich Felker | 191ebca | 2011-06-30 23:02:27 -0400 | [diff] [blame] | 641 | r_path = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 642 | } |
| 643 | } |
| 644 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 645 | static void load_preload(char *s) |
| 646 | { |
| 647 | int tmp; |
| 648 | char *z; |
| 649 | for (z=s; *z; s=z) { |
| 650 | for ( ; *s && isspace(*s); s++); |
| 651 | for (z=s; *z && !isspace(*z); z++); |
| 652 | tmp = *z; |
| 653 | *z = 0; |
| 654 | load_library(s); |
| 655 | *z = tmp; |
| 656 | } |
| 657 | } |
| 658 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 659 | static void make_global(struct dso *p) |
| 660 | { |
| 661 | for (; p; p=p->next) p->global = 1; |
| 662 | } |
| 663 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 664 | static void reloc_all(struct dso *p) |
| 665 | { |
| 666 | size_t dyn[DYN_CNT] = {0}; |
| 667 | for (; p; p=p->next) { |
| 668 | if (p->relocated) continue; |
| 669 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | babf820 | 2012-08-05 12:50:26 -0400 | [diff] [blame] | 670 | #ifdef NEED_ARCH_RELOCS |
| 671 | do_arch_relocs(p, head); |
| 672 | #endif |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 673 | do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
| 674 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
| 675 | do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 676 | do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3); |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 677 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 678 | } |
| 679 | } |
| 680 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 681 | static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride) |
| 682 | { |
| 683 | for (; cnt--; ph = (void *)((char *)ph + stride)) |
| 684 | if (ph->p_type == PT_DYNAMIC) |
| 685 | return ph->p_vaddr; |
| 686 | return 0; |
| 687 | } |
| 688 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 689 | static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p) |
| 690 | { |
| 691 | size_t min_addr = -1, max_addr = 0; |
| 692 | for (; cnt--; ph = (void *)((char *)ph + stride)) { |
| 693 | if (ph->p_type != PT_LOAD) continue; |
| 694 | if (ph->p_vaddr < min_addr) |
| 695 | min_addr = ph->p_vaddr; |
| 696 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 697 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 698 | } |
| 699 | min_addr &= -PAGE_SIZE; |
| 700 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 701 | p->map = p->base + min_addr; |
| 702 | p->map_len = max_addr - min_addr; |
| 703 | } |
| 704 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 705 | static void do_fini() |
| 706 | { |
| 707 | struct dso *p; |
| 708 | size_t dyn[DYN_CNT] = {0}; |
| 709 | for (p=fini_head; p; p=p->fini_next) { |
| 710 | if (!p->constructed) continue; |
| 711 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 712 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 713 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 714 | size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n; |
| 715 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 716 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 717 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame^] | 718 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 719 | ((void (*)(void))(p->base + dyn[DT_FINI]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 720 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 721 | } |
| 722 | } |
| 723 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 724 | static void do_init_fini(struct dso *p) |
| 725 | { |
| 726 | size_t dyn[DYN_CNT] = {0}; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 727 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 728 | /* Allow recursive calls that arise when a library calls |
| 729 | * dlopen from one of its constructors, but block any |
| 730 | * other threads until all ctors have finished. */ |
| 731 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 732 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 733 | if (p->constructed) continue; |
| 734 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 735 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 736 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 737 | p->fini_next = fini_head; |
| 738 | fini_head = p; |
| 739 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 740 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame^] | 741 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 742 | ((void (*)(void))(p->base + dyn[DT_INIT]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 743 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 744 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 745 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
| 746 | size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]); |
| 747 | while (n--) ((void (*)(void))*fn++)(); |
| 748 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 749 | if (!need_locking && libc.threads_minus_1) { |
| 750 | need_locking = 1; |
| 751 | pthread_mutex_lock(&init_fini_lock); |
| 752 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 753 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 754 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 755 | } |
| 756 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 757 | void _dl_debug_state(void) |
| 758 | { |
| 759 | } |
| 760 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 761 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 762 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 763 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 764 | struct dso *p; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 765 | |
| 766 | if (!tls_cnt) return mem; |
| 767 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 768 | void **dtv = (void *)mem; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 769 | dtv[0] = (void *)tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 770 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 771 | #ifdef TLS_ABOVE_TP |
| 772 | mem += sizeof(void *) * (tls_cnt+1); |
| 773 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 774 | td = (pthread_t)mem; |
| 775 | mem += sizeof(struct pthread); |
| 776 | |
| 777 | for (p=head; p; p=p->next) { |
| 778 | if (!p->tls_id) continue; |
| 779 | dtv[p->tls_id] = mem + p->tls_offset; |
| 780 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 781 | } |
| 782 | #else |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 783 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 784 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 785 | td = (pthread_t)mem; |
| 786 | |
| 787 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 788 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 789 | dtv[p->tls_id] = mem - p->tls_offset; |
| 790 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 791 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 792 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 793 | td->dtv = dtv; |
| 794 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 795 | } |
| 796 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 797 | void *__tls_get_addr(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 798 | { |
| 799 | pthread_t self = __pthread_self(); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 800 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 801 | return (char *)self->dtv[v[0]]+v[1]; |
| 802 | |
| 803 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 804 | sigset_t set; |
Rich Felker | 00902c7 | 2012-10-06 23:57:51 -0400 | [diff] [blame] | 805 | pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 806 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 807 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 808 | return (char *)self->dtv[v[0]]+v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 809 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 810 | |
| 811 | /* This is safe without any locks held because, if the caller |
| 812 | * is able to request the Nth entry of the DTV, the DSO list |
| 813 | * must be valid at least that far out and it was synchronized |
| 814 | * at program startup or by an already-completed call to dlopen. */ |
| 815 | struct dso *p; |
| 816 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 817 | |
| 818 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 819 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 820 | void **newdtv = p->new_dtv + |
| 821 | (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 822 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 823 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 824 | newdtv[0] = (void *)v[0]; |
| 825 | self->dtv = newdtv; |
| 826 | } |
| 827 | |
| 828 | /* Get new TLS memory from new DSO */ |
| 829 | unsigned char *mem = p->new_tls + |
| 830 | (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1); |
| 831 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1); |
| 832 | self->dtv[v[0]] = mem; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 833 | memcpy(mem, p->tls_image, p->tls_len); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 834 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 835 | return mem + v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 836 | } |
| 837 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 838 | static void update_tls_size() |
| 839 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 840 | libc.tls_size = ALIGN( |
| 841 | (1+tls_cnt) * sizeof(void *) + |
| 842 | tls_offset + |
| 843 | sizeof(struct pthread) + |
| 844 | tls_align * 2, |
| 845 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 846 | } |
| 847 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 848 | void *__dynlink(int argc, char **argv) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 849 | { |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 850 | size_t aux[AUX_CNT] = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 851 | size_t i; |
| 852 | Phdr *phdr; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 853 | Ehdr *ehdr; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 854 | static struct dso builtin_dsos[3]; |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 855 | struct dso *const app = builtin_dsos+0; |
| 856 | struct dso *const lib = builtin_dsos+1; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 857 | struct dso *const vdso = builtin_dsos+2; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 858 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 859 | size_t vdso_base; |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 860 | size_t *auxv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 861 | char **envp = argv+argc+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 862 | |
| 863 | /* Find aux vector just past environ[] */ |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 864 | for (i=argc+1; argv[i]; i++) |
| 865 | if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16)) |
| 866 | env_path = argv[i]+16; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 867 | else if (!memcmp(argv[i], "LD_PRELOAD=", 11)) |
| 868 | env_preload = argv[i]+11; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 869 | auxv = (void *)(argv+i+1); |
| 870 | |
| 871 | decode_vec(auxv, aux, AUX_CNT); |
| 872 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 873 | /* Only trust user/env if kernel says we're not suid/sgid */ |
| 874 | if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
Rich Felker | a045883 | 2011-08-16 07:46:42 -0400 | [diff] [blame] | 875 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 876 | env_path = 0; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 877 | env_preload = 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 878 | } |
| 879 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 880 | /* If the dynamic linker was invoked as a program itself, AT_BASE |
| 881 | * will not be set. In that case, we assume the base address is |
| 882 | * the start of the page containing the PHDRs; I don't know any |
| 883 | * better approach... */ |
| 884 | if (!aux[AT_BASE]) { |
| 885 | aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE; |
| 886 | aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0; |
| 887 | } |
| 888 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 889 | /* The dynamic linker load address is passed by the kernel |
| 890 | * in the AUX vector, so this is easy. */ |
| 891 | lib->base = (void *)aux[AT_BASE]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 892 | lib->name = lib->shortname = "libc.so"; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 893 | lib->global = 1; |
| 894 | ehdr = (void *)lib->base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 895 | lib->phnum = ehdr->e_phnum; |
| 896 | lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff); |
| 897 | find_map_range(lib->phdr, ehdr->e_phnum, ehdr->e_phentsize, lib); |
| 898 | lib->dynv = (void *)(lib->base + find_dyn(lib->phdr, |
Rich Felker | f44e239 | 2013-07-27 21:37:05 -0400 | [diff] [blame] | 899 | ehdr->e_phnum, ehdr->e_phentsize)); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 900 | decode_dyn(lib); |
| 901 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 902 | if (aux[AT_PHDR]) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 903 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 904 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 905 | /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */ |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 906 | app->phdr = phdr = (void *)aux[AT_PHDR]; |
| 907 | app->phnum = aux[AT_PHNUM]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 908 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 909 | if (phdr->p_type == PT_PHDR) |
| 910 | app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 911 | else if (phdr->p_type == PT_INTERP) |
| 912 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 913 | else if (phdr->p_type == PT_TLS) { |
| 914 | tls_image = phdr->p_vaddr; |
| 915 | app->tls_len = phdr->p_filesz; |
| 916 | app->tls_size = phdr->p_memsz; |
| 917 | app->tls_align = phdr->p_align; |
| 918 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 919 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 920 | if (app->tls_size) app->tls_image = (char *)app->base + tls_image; |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 921 | if (interp_off) lib->name = (char *)app->base + interp_off; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 922 | app->name = argv[0]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 923 | app->dynv = (void *)(app->base + find_dyn( |
| 924 | (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT])); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 925 | find_map_range((void *)aux[AT_PHDR], |
| 926 | aux[AT_PHNUM], aux[AT_PHENT], app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 927 | } else { |
| 928 | int fd; |
| 929 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 930 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 931 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
| 932 | *argv++ = (void *)-1; |
| 933 | if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1; |
| 934 | if (!argv[0]) { |
| 935 | dprintf(2, "musl libc/dynamic program loader\n"); |
| 936 | dprintf(2, "usage: %s pathname%s\n", ldname, |
| 937 | ldd_mode ? "" : " [args]"); |
| 938 | _exit(1); |
| 939 | } |
| 940 | fd = open(argv[0], O_RDONLY); |
| 941 | if (fd < 0) { |
| 942 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 943 | _exit(1); |
| 944 | } |
| 945 | runtime = 1; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 946 | ehdr = (void *)map_library(fd, app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 947 | if (!ehdr) { |
| 948 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 949 | _exit(1); |
| 950 | } |
| 951 | runtime = 0; |
| 952 | close(fd); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 953 | lib->name = ldname; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 954 | app->name = argv[0]; |
Rich Felker | 876748e | 2013-07-26 14:25:51 -0400 | [diff] [blame] | 955 | aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry; |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 956 | /* Find the name that would have been used for the dynamic |
| 957 | * linker had ldd not taken its place. */ |
| 958 | if (ldd_mode) { |
| 959 | for (i=0; i<app->phnum; i++) { |
| 960 | if (app->phdr[i].p_type == PT_INTERP) |
| 961 | lib->name = (void *)(app->base |
| 962 | + app->phdr[i].p_vaddr); |
| 963 | } |
| 964 | dprintf(1, "\t%s (%p)\n", lib->name, lib->base); |
| 965 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 966 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 967 | if (app->tls_size) { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 968 | app->tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 969 | #ifdef TLS_ABOVE_TP |
| 970 | app->tls_offset = 0; |
| 971 | tls_offset = app->tls_size |
| 972 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 973 | & (app->tls_align-1) ); |
| 974 | #else |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 975 | tls_offset = app->tls_offset = app->tls_size |
| 976 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 977 | & (app->tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 978 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 979 | tls_align = MAXP2(tls_align, app->tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 980 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 981 | app->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 982 | decode_dyn(app); |
| 983 | |
| 984 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 985 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 986 | ehdr = (void *)vdso_base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 987 | vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 988 | vdso->phnum = ehdr->e_phnum; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 989 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 990 | if (phdr->p_type == PT_DYNAMIC) |
| 991 | vdso->dynv = (void *)(vdso_base + phdr->p_offset); |
| 992 | if (phdr->p_type == PT_LOAD) |
| 993 | vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
| 994 | } |
Rich Felker | 75a31fa | 2012-11-25 20:56:31 -0500 | [diff] [blame] | 995 | vdso->name = ""; |
| 996 | vdso->shortname = "linux-gate.so.1"; |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 997 | vdso->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 998 | decode_dyn(vdso); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 999 | vdso->prev = lib; |
| 1000 | lib->next = vdso; |
| 1001 | } |
| 1002 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1003 | /* Initial dso chain consists only of the app. We temporarily |
| 1004 | * append the dynamic linker/libc so we can relocate it, then |
| 1005 | * restore the initial chain in preparation for loading third |
| 1006 | * party libraries (preload/needed). */ |
| 1007 | head = tail = app; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1008 | ldso = lib; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1009 | app->next = lib; |
| 1010 | reloc_all(lib); |
| 1011 | app->next = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1012 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1013 | /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */ |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1014 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1015 | /* Donate unused parts of app and library mapping to malloc */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1016 | reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]); |
| 1017 | ehdr = (void *)lib->base; |
| 1018 | reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff), |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1019 | ehdr->e_phentsize, ehdr->e_phnum); |
| 1020 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1021 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | fd7015d | 2012-01-23 18:32:40 -0500 | [diff] [blame] | 1022 | * namespace, and perform all remaining relocations. The main |
| 1023 | * program must be relocated LAST since it may contain copy |
| 1024 | * relocations which depend on libraries' relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1025 | if (env_preload) load_preload(env_preload); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1026 | load_deps(app); |
| 1027 | make_global(app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1028 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1029 | reloc_all(app->next); |
| 1030 | reloc_all(app); |
| 1031 | |
| 1032 | update_tls_size(); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1033 | if (tls_cnt) { |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1034 | void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE, |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1035 | MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); |
| 1036 | if (mem==MAP_FAILED || |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1037 | !__install_initial_tls(__copy_tls(mem))) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1038 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1039 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1040 | _exit(127); |
| 1041 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1042 | } |
| 1043 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1044 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1045 | if (ldd_mode) _exit(0); |
| 1046 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1047 | /* Switch to runtime mode: any further failures in the dynamic |
| 1048 | * linker are a reportable failure rather than a fatal startup |
| 1049 | * error. If the dynamic loader (dlopen) will not be used, free |
| 1050 | * all memory used by the dynamic linker. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1051 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1052 | |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 1053 | #ifndef DYNAMIC_IS_RO |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1054 | for (i=0; app->dynv[i]; i+=2) |
| 1055 | if (app->dynv[i]==DT_DEBUG) |
| 1056 | app->dynv[i+1] = (size_t)&debug; |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 1057 | #endif |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1058 | debug.ver = 1; |
| 1059 | debug.bp = _dl_debug_state; |
| 1060 | debug.head = head; |
| 1061 | debug.base = lib->base; |
| 1062 | debug.state = 0; |
| 1063 | _dl_debug_state(); |
| 1064 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 1065 | if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1066 | __init_libc(envp, argv[0]); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1067 | atexit(do_fini); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1068 | errno = 0; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1069 | do_init_fini(tail); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1070 | |
| 1071 | return (void *)aux[AT_ENTRY]; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1072 | } |
| 1073 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1074 | void *dlopen(const char *file, int mode) |
| 1075 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1076 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1077 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1078 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1079 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1080 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1081 | |
| 1082 | if (!file) return head; |
| 1083 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1084 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1085 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1086 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1087 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1088 | p = 0; |
| 1089 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1090 | orig_tls_offset = tls_offset; |
| 1091 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1092 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1093 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1094 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1095 | rtld_fail = &jb; |
| 1096 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1097 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1098 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1099 | if (p->deps[i]->global < 0) |
| 1100 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1101 | for (p=orig_tail->next; p; p=next) { |
| 1102 | next = p->next; |
| 1103 | munmap(p->map, p->map_len); |
| 1104 | free(p->deps); |
| 1105 | free(p); |
| 1106 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1107 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1108 | tls_offset = orig_tls_offset; |
| 1109 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1110 | tail = orig_tail; |
| 1111 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1112 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1113 | errflag = 1; |
| 1114 | goto end; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1115 | } else p = load_library(file); |
| 1116 | |
| 1117 | if (!p) { |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1118 | snprintf(errbuf, sizeof errbuf, noload ? |
| 1119 | "Library %s is not already loaded" : |
| 1120 | "Error loading shared library %s: %m", |
| 1121 | file); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1122 | errflag = 1; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1123 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1124 | } |
| 1125 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1126 | /* First load handling */ |
| 1127 | if (!p->deps) { |
| 1128 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1129 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1130 | if (!p->deps[i]->global) |
| 1131 | p->deps[i]->global = -1; |
| 1132 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1133 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1134 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1135 | if (p->deps[i]->global < 0) |
| 1136 | p->deps[i]->global = 0; |
| 1137 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1138 | } |
| 1139 | |
| 1140 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1141 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1142 | p->deps[i]->global = 1; |
| 1143 | p->global = 1; |
| 1144 | } |
| 1145 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1146 | update_tls_size(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1147 | |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 1148 | if (ssp_used) __init_ssp(libc.auxv); |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 1149 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1150 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1151 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1152 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1153 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1154 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1155 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1156 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1157 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1158 | return p; |
| 1159 | } |
| 1160 | |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1161 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1162 | { |
| 1163 | struct dso *p; |
| 1164 | for (p=head; p; p=p->next) if (h==p) return 0; |
| 1165 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1166 | errflag = 1; |
| 1167 | return 1; |
| 1168 | } |
| 1169 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1170 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1171 | { |
| 1172 | size_t i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1173 | uint32_t h = 0, gh = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1174 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1175 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1176 | if (p == RTLD_DEFAULT) { |
| 1177 | p = head; |
| 1178 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1179 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1180 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1181 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1182 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1183 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1184 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1185 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1186 | return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value}); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1187 | return def.dso->base + def.sym->st_value; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1188 | } |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1189 | if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p)) |
| 1190 | return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1191 | if (p->ghashtab) { |
| 1192 | gh = gnu_hash(s); |
| 1193 | sym = gnu_lookup(s, gh, p); |
| 1194 | } else { |
| 1195 | h = sysv_hash(s); |
| 1196 | sym = sysv_lookup(s, h, p); |
| 1197 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1198 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1199 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1200 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1201 | return p->base + sym->st_value; |
| 1202 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1203 | if (p->deps[i]->ghashtab) { |
| 1204 | if (!gh) gh = gnu_hash(s); |
Rich Felker | a5d6199 | 2012-08-25 17:40:27 -0400 | [diff] [blame] | 1205 | sym = gnu_lookup(s, gh, p->deps[i]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1206 | } else { |
| 1207 | if (!h) h = sysv_hash(s); |
| 1208 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1209 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1210 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1211 | return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1212 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1213 | return p->deps[i]->base + sym->st_value; |
| 1214 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1215 | failed: |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1216 | errflag = 1; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1217 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1218 | return 0; |
| 1219 | } |
| 1220 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1221 | int __dladdr(void *addr, Dl_info *info) |
| 1222 | { |
| 1223 | struct dso *p; |
| 1224 | Sym *sym; |
| 1225 | uint32_t nsym; |
| 1226 | char *strings; |
| 1227 | size_t i; |
| 1228 | void *best = 0; |
| 1229 | char *bestname; |
| 1230 | |
| 1231 | pthread_rwlock_rdlock(&lock); |
| 1232 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1233 | pthread_rwlock_unlock(&lock); |
| 1234 | |
| 1235 | if (!p) return 0; |
| 1236 | |
| 1237 | sym = p->syms; |
| 1238 | strings = p->strings; |
| 1239 | if (p->hashtab) { |
| 1240 | nsym = p->hashtab[1]; |
| 1241 | } else { |
| 1242 | uint32_t *buckets; |
| 1243 | uint32_t *hashval; |
| 1244 | buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 1245 | sym += p->ghashtab[1]; |
| 1246 | for (i = 0; i < p->ghashtab[0]; i++) { |
| 1247 | if (buckets[i] > nsym) |
| 1248 | nsym = buckets[i]; |
| 1249 | } |
| 1250 | if (nsym) { |
| 1251 | nsym -= p->ghashtab[1]; |
| 1252 | hashval = buckets + p->ghashtab[0] + nsym; |
| 1253 | do nsym++; |
| 1254 | while (!(*hashval++ & 1)); |
| 1255 | } |
| 1256 | } |
| 1257 | |
| 1258 | for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1259 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1260 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1261 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
| 1262 | void *symaddr = p->base + sym->st_value; |
| 1263 | if (symaddr > addr || symaddr < best) |
| 1264 | continue; |
| 1265 | best = symaddr; |
| 1266 | bestname = strings + sym->st_name; |
| 1267 | if (addr == symaddr) |
| 1268 | break; |
| 1269 | } |
| 1270 | } |
| 1271 | |
| 1272 | if (!best) return 0; |
| 1273 | |
| 1274 | info->dli_fname = p->name; |
| 1275 | info->dli_fbase = p->base; |
| 1276 | info->dli_sname = bestname; |
| 1277 | info->dli_saddr = best; |
| 1278 | |
| 1279 | return 1; |
| 1280 | } |
| 1281 | |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1282 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1283 | { |
| 1284 | void *res; |
| 1285 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1286 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1287 | pthread_rwlock_unlock(&lock); |
| 1288 | return res; |
| 1289 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1290 | |
| 1291 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1292 | { |
| 1293 | struct dso *current; |
| 1294 | struct dl_phdr_info info; |
| 1295 | int ret = 0; |
| 1296 | for(current = head; current;) { |
| 1297 | info.dlpi_addr = (uintptr_t)current->base; |
| 1298 | info.dlpi_name = current->name; |
| 1299 | info.dlpi_phdr = current->phdr; |
| 1300 | info.dlpi_phnum = current->phnum; |
| 1301 | info.dlpi_adds = gencnt; |
| 1302 | info.dlpi_subs = 0; |
| 1303 | info.dlpi_tls_modid = current->tls_id; |
| 1304 | info.dlpi_tls_data = current->tls_image; |
| 1305 | |
| 1306 | ret = (callback)(&info, sizeof (info), data); |
| 1307 | |
| 1308 | if (ret != 0) break; |
| 1309 | |
| 1310 | pthread_rwlock_rdlock(&lock); |
| 1311 | current = current->next; |
| 1312 | pthread_rwlock_unlock(&lock); |
| 1313 | } |
| 1314 | return ret; |
| 1315 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1316 | #else |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1317 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1318 | { |
| 1319 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1320 | errflag = 1; |
| 1321 | return 1; |
| 1322 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1323 | void *dlopen(const char *file, int mode) |
| 1324 | { |
| 1325 | return 0; |
| 1326 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1327 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1328 | { |
| 1329 | return 0; |
| 1330 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1331 | int __dladdr (void *addr, Dl_info *info) |
| 1332 | { |
| 1333 | return 0; |
| 1334 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1335 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1336 | |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1337 | int __dlinfo(void *dso, int req, void *res) |
| 1338 | { |
| 1339 | if (invalid_dso_handle(dso)) return -1; |
| 1340 | if (req != RTLD_DI_LINKMAP) { |
| 1341 | snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req); |
| 1342 | errflag = 1; |
| 1343 | return -1; |
| 1344 | } |
| 1345 | *(struct link_map **)res = dso; |
| 1346 | return 0; |
| 1347 | } |
| 1348 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1349 | char *dlerror() |
| 1350 | { |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1351 | if (!errflag) return 0; |
| 1352 | errflag = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1353 | return errbuf; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1354 | } |
| 1355 | |
| 1356 | int dlclose(void *p) |
| 1357 | { |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1358 | return invalid_dso_handle(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1359 | } |