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 | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 66 | int16_t *versym; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 67 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 68 | unsigned char *map; |
| 69 | size_t map_len; |
| 70 | dev_t dev; |
| 71 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 72 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 73 | char relocated; |
| 74 | char constructed; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 75 | char kernel_mapped; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 76 | struct dso **deps, *needed_by; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 77 | char *rpath_orig, *rpath; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 78 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 79 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 80 | void **new_dtv; |
| 81 | unsigned char *new_tls; |
| 82 | int new_dtv_idx, new_tls_idx; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 83 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 84 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 85 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 86 | }; |
| 87 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 88 | struct symdef { |
| 89 | Sym *sym; |
| 90 | struct dso *dso; |
| 91 | }; |
| 92 | |
Rich Felker | 59f4086 | 2012-08-05 13:46:39 -0400 | [diff] [blame] | 93 | #include "reloc.h" |
| 94 | |
Rich Felker | 58aa5f4 | 2012-05-03 20:42:45 -0400 | [diff] [blame] | 95 | void __init_ssp(size_t *); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 96 | void *__install_initial_tls(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 97 | void __init_libc(char **, char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 98 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 99 | static struct dso *head, *tail, *ldso, *fini_head; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 100 | static char *env_path, *sys_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 101 | static unsigned long long gencnt; |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 102 | static int ssp_used; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 103 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 104 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 105 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 106 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 107 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 108 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 109 | static struct debug debug; |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 110 | 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] | 111 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 112 | |
| 113 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 114 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 115 | #define AUX_CNT 38 |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 116 | #define DYN_CNT 34 |
| 117 | |
| 118 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 119 | { |
| 120 | memset(a, 0, cnt*sizeof(size_t)); |
| 121 | for (; v[0]; v+=2) if (v[0]<cnt) { |
| 122 | a[0] |= 1ULL<<v[0]; |
| 123 | a[v[0]] = v[1]; |
| 124 | } |
| 125 | } |
| 126 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 127 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 128 | { |
| 129 | for (; v[0]!=key; v+=2) |
| 130 | if (!v[0]) return 0; |
| 131 | *r = v[1]; |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 136 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 137 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 138 | uint_fast32_t h = 0; |
| 139 | while (*s) { |
| 140 | h = 16*h + *s++; |
| 141 | h ^= h>>24 & 0xf0; |
| 142 | } |
| 143 | return h & 0xfffffff; |
| 144 | } |
| 145 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 146 | static uint32_t gnu_hash(const char *s0) |
| 147 | { |
| 148 | const unsigned char *s = (void *)s0; |
| 149 | uint_fast32_t h = 5381; |
| 150 | for (; *s; s++) |
| 151 | h = h*33 + *s; |
| 152 | return h; |
| 153 | } |
| 154 | |
| 155 | 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] | 156 | { |
| 157 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 158 | Sym *syms = dso->syms; |
| 159 | uint32_t *hashtab = dso->hashtab; |
| 160 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 161 | for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) { |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 162 | if ((!dso->versym || dso->versym[i] >= 0) |
| 163 | && (!strcmp(s, strings+syms[i].st_name))) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 164 | return syms+i; |
| 165 | } |
| 166 | return 0; |
| 167 | } |
| 168 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 169 | static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso) |
| 170 | { |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 171 | Sym *syms = dso->syms; |
| 172 | char *strings = dso->strings; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 173 | uint32_t *hashtab = dso->ghashtab; |
| 174 | uint32_t nbuckets = hashtab[0]; |
| 175 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
| 176 | uint32_t h2; |
| 177 | uint32_t *hashval; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 178 | uint32_t i = buckets[h1 % nbuckets]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 179 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 180 | if (!i) return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 181 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 182 | hashval = buckets + nbuckets + (i - hashtab[1]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 183 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 184 | for (h1 |= 1; ; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 185 | h2 = *hashval++; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 186 | if ((!dso->versym || dso->versym[i] >= 0) |
| 187 | && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name)) |
| 188 | return syms+i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 189 | if (h2 & 1) break; |
| 190 | } |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 195 | #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] | 196 | #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] | 197 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 198 | 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] | 199 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 200 | uint32_t h = 0, gh = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 201 | struct symdef def = {0}; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 202 | if (dso->ghashtab) { |
| 203 | gh = gnu_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 204 | if (gh == 0x1f4039c9 && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 205 | } else { |
| 206 | h = sysv_hash(s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 207 | if (h == 0x595a4cc && !strcmp(s, "__stack_chk_fail")) ssp_used = 1; |
| 208 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 209 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 210 | Sym *sym; |
| 211 | if (!dso->global) continue; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 212 | if (dso->ghashtab) { |
| 213 | if (!gh) gh = gnu_hash(s); |
| 214 | sym = gnu_lookup(s, gh, dso); |
| 215 | } else { |
| 216 | if (!h) h = sysv_hash(s); |
| 217 | sym = sysv_lookup(s, h, dso); |
| 218 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 219 | if (!sym) continue; |
| 220 | if (!sym->st_shndx) |
| 221 | if (need_def || (sym->st_info&0xf) == STT_TLS) |
| 222 | continue; |
| 223 | if (!sym->st_value) |
| 224 | if ((sym->st_info&0xf) != STT_TLS) |
| 225 | continue; |
| 226 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 227 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
| 228 | |
| 229 | if (def.sym && sym->st_info>>4 == STB_WEAK) continue; |
| 230 | def.sym = sym; |
| 231 | def.dso = dso; |
| 232 | if (sym->st_info>>4 == STB_GLOBAL) break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 233 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 234 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 235 | } |
| 236 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 237 | 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] | 238 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 239 | unsigned char *base = dso->base; |
| 240 | Sym *syms = dso->syms; |
| 241 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 242 | Sym *sym; |
| 243 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 244 | void *ctx; |
| 245 | int type; |
| 246 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 247 | struct symdef def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 248 | |
| 249 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 250 | type = R_TYPE(rel[1]); |
| 251 | sym_index = R_SYM(rel[1]); |
| 252 | if (sym_index) { |
| 253 | sym = syms + sym_index; |
| 254 | name = strings + sym->st_name; |
Rich Felker | 7cb44cd | 2012-08-05 02:44:32 -0400 | [diff] [blame] | 255 | ctx = IS_COPY(type) ? head->next : head; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 256 | def = find_sym(ctx, name, IS_PLT(type)); |
| 257 | if (!def.sym && sym->st_info>>4 != STB_WEAK) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 258 | snprintf(errbuf, sizeof errbuf, |
| 259 | "Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 260 | dso->name, name); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 261 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 262 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 263 | ldso_fail = 1; |
| 264 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 265 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 266 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 267 | sym = 0; |
| 268 | def.sym = 0; |
| 269 | def.dso = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 270 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 271 | do_single_reloc(dso, base, (void *)(base + rel[0]), type, |
| 272 | stride>2 ? rel[2] : 0, sym, sym?sym->st_size:0, def, |
| 273 | def.sym?(size_t)(def.dso->base+def.sym->st_value):0); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 274 | } |
| 275 | } |
| 276 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 277 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 278 | * needing at least a page of dirty memory even if they have no global |
| 279 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 280 | * and "donate" them to the heap by setting up minimal malloc |
| 281 | * structures and then freeing them. */ |
| 282 | |
| 283 | static void reclaim(unsigned char *base, size_t start, size_t end) |
| 284 | { |
| 285 | size_t *a, *z; |
| 286 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 287 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 288 | if (start>end || end-start < 4*sizeof(size_t)) return; |
| 289 | a = (size_t *)(base + start); |
| 290 | z = (size_t *)(base + end); |
| 291 | a[-2] = 1; |
| 292 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 293 | z[1] = 1; |
| 294 | free(a); |
| 295 | } |
| 296 | |
| 297 | static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt) |
| 298 | { |
| 299 | for (; phcnt--; ph=(void *)((char *)ph+phent)) { |
| 300 | if (ph->p_type!=PT_LOAD) continue; |
| 301 | if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue; |
| 302 | reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 303 | reclaim(base, ph->p_vaddr+ph->p_memsz, |
| 304 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 305 | } |
| 306 | } |
| 307 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 308 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 309 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 310 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 311 | void *allocated_buf=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 312 | size_t phsize; |
| 313 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 314 | size_t this_min, this_max; |
| 315 | off_t off_start; |
| 316 | Ehdr *eh; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 317 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 318 | unsigned prot; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 319 | unsigned char *map=MAP_FAILED, *base; |
Rich Felker | 7443dd2 | 2013-08-02 09:25:12 -0400 | [diff] [blame] | 320 | size_t dyn=0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 321 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 322 | size_t i; |
| 323 | |
| 324 | ssize_t l = read(fd, buf, sizeof buf); |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 325 | eh = buf; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 326 | if (l<0) return 0; |
| 327 | if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) |
| 328 | goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 329 | phsize = eh->e_phentsize * eh->e_phnum; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 330 | if (phsize > sizeof buf - sizeof *eh) { |
| 331 | allocated_buf = malloc(phsize); |
| 332 | if (!allocated_buf) return 0; |
| 333 | l = pread(fd, allocated_buf, phsize, eh->e_phoff); |
| 334 | if (l < 0) goto error; |
| 335 | if (l != phsize) goto noexec; |
| 336 | ph = ph0 = allocated_buf; |
| 337 | } else if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 338 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 339 | if (l < 0) goto error; |
| 340 | if (l != phsize) goto noexec; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 341 | ph = ph0 = (void *)(buf + 1); |
| 342 | } else { |
| 343 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 344 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 345 | for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
| 346 | if (ph->p_type == PT_DYNAMIC) |
| 347 | dyn = ph->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 348 | if (ph->p_type == PT_TLS) { |
| 349 | tls_image = ph->p_vaddr; |
| 350 | dso->tls_align = ph->p_align; |
| 351 | dso->tls_len = ph->p_filesz; |
| 352 | dso->tls_size = ph->p_memsz; |
| 353 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 354 | if (ph->p_type != PT_LOAD) continue; |
| 355 | if (ph->p_vaddr < addr_min) { |
| 356 | addr_min = ph->p_vaddr; |
| 357 | off_start = ph->p_offset; |
| 358 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 359 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 360 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 361 | } |
| 362 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 363 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 364 | } |
| 365 | } |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 366 | if (!dyn) goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 367 | addr_max += PAGE_SIZE-1; |
| 368 | addr_max &= -PAGE_SIZE; |
| 369 | addr_min &= -PAGE_SIZE; |
| 370 | off_start &= -PAGE_SIZE; |
| 371 | map_len = addr_max - addr_min + off_start; |
| 372 | /* The first time, we map too much, possibly even more than |
| 373 | * the length of the file. This is okay because we will not |
| 374 | * use the invalid part; we just need to reserve the right |
| 375 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 376 | map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 377 | if (map==MAP_FAILED) goto error; |
Rich Felker | 339516a | 2013-07-31 14:42:08 -0400 | [diff] [blame] | 378 | /* If the loaded file is not relocatable and the requested address is |
| 379 | * not available, then the load operation must fail. */ |
| 380 | if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { |
| 381 | errno = EBUSY; |
| 382 | goto error; |
| 383 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 384 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 385 | dso->phdr = 0; |
| 386 | dso->phnum = 0; |
| 387 | 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] | 388 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 389 | /* Check if the programs headers are in this load segment, and |
| 390 | * if so, record the address for use by dl_iterate_phdr. */ |
| 391 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 392 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 393 | dso->phdr = (void *)(base + ph->p_vaddr |
| 394 | + (eh->e_phoff-ph->p_offset)); |
| 395 | dso->phnum = eh->e_phnum; |
| 396 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 397 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 398 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 399 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 400 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 401 | off_start = ph->p_offset & -PAGE_SIZE; |
| 402 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 403 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 404 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 405 | if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
| 406 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 407 | if (ph->p_memsz > ph->p_filesz) { |
| 408 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 409 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 410 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 411 | 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) |
| 412 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 413 | } |
| 414 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 415 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 416 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 417 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0) |
| 418 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 419 | break; |
| 420 | } |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 421 | if (!runtime) reclaim_gaps(base, ph0, eh->e_phentsize, eh->e_phnum); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 422 | dso->map = map; |
| 423 | dso->map_len = map_len; |
| 424 | dso->base = base; |
| 425 | dso->dynv = (void *)(base+dyn); |
| 426 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Rich Felker | 8d01dfc | 2013-08-02 09:59:02 -0400 | [diff] [blame] | 427 | free(allocated_buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 428 | return map; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 429 | noexec: |
| 430 | errno = ENOEXEC; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 431 | error: |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 432 | if (map!=MAP_FAILED) munmap(map, map_len); |
| 433 | free(allocated_buf); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 434 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 435 | } |
| 436 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 437 | 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] | 438 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 439 | size_t l; |
| 440 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 441 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 442 | s += strspn(s, ":\n"); |
| 443 | l = strcspn(s, ":\n"); |
| 444 | if (l-1 >= INT_MAX) return -1; |
| 445 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size) |
| 446 | continue; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 447 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 448 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 449 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 450 | } |
| 451 | |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 452 | static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) |
| 453 | { |
| 454 | size_t n, l; |
| 455 | const char *s, *t, *origin; |
| 456 | char *d; |
| 457 | if (p->rpath) return 0; |
| 458 | if (!p->rpath_orig) return -1; |
| 459 | if (!strchr(p->rpath_orig, '$')) { |
| 460 | p->rpath = p->rpath_orig; |
| 461 | return 0; |
| 462 | } |
| 463 | n = 0; |
| 464 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 465 | while ((t=strchr(s, '$'))) { |
| 466 | if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) |
| 467 | return -1; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 468 | s = t+1; |
| 469 | n++; |
| 470 | } |
| 471 | if (n > SSIZE_MAX/PATH_MAX) return -1; |
| 472 | |
| 473 | if (p->kernel_mapped) { |
| 474 | /* $ORIGIN searches cannot be performed for the main program |
| 475 | * when it is suid/sgid/AT_SECURE. This is because the |
| 476 | * pathname is under the control of the caller of execve. |
| 477 | * For libraries, however, $ORIGIN can be processed safely |
| 478 | * since the library's pathname came from a trusted source |
| 479 | * (either system paths or a call to dlopen). */ |
| 480 | if (libc.secure) |
| 481 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 482 | l = readlink("/proc/self/exe", buf, buf_size); |
| 483 | if (l >= buf_size) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 484 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 485 | buf[l] = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 486 | origin = buf; |
| 487 | } else { |
| 488 | origin = p->name; |
| 489 | } |
| 490 | t = strrchr(origin, '/'); |
| 491 | l = t ? t-origin : 0; |
| 492 | p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); |
| 493 | if (!p->rpath) return -1; |
| 494 | |
| 495 | d = p->rpath; |
| 496 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 497 | while ((t=strchr(s, '$'))) { |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 498 | memcpy(d, s, t-s); |
| 499 | d += t-s; |
| 500 | memcpy(d, origin, l); |
| 501 | d += l; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 502 | /* It was determined previously that the '$' is followed |
| 503 | * either by "ORIGIN" or "{ORIGIN}". */ |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 504 | s = t + 7 + 2*(t[1]=='{'); |
| 505 | } |
| 506 | strcpy(d, s); |
| 507 | return 0; |
| 508 | } |
| 509 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 510 | static void decode_dyn(struct dso *p) |
| 511 | { |
| 512 | size_t dyn[DYN_CNT] = {0}; |
| 513 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 514 | p->syms = (void *)(p->base + dyn[DT_SYMTAB]); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 515 | p->strings = (void *)(p->base + dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 516 | if (dyn[0]&(1<<DT_HASH)) |
| 517 | p->hashtab = (void *)(p->base + dyn[DT_HASH]); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 518 | if (dyn[0]&(1<<DT_RPATH)) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 519 | p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 520 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
| 521 | p->ghashtab = (void *)(p->base + *dyn); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 522 | if (search_vec(p->dynv, dyn, DT_VERSYM)) |
| 523 | p->versym = (void *)(p->base + *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 524 | } |
| 525 | |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 526 | static struct dso *load_library(const char *name, struct dso *needed_by) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 527 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 528 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 529 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 530 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 531 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 532 | int fd; |
| 533 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 534 | size_t alloc_size; |
| 535 | int n_th = 0; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 536 | int is_self = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 537 | |
| 538 | /* Catch and block attempts to reload the implementation itself */ |
| 539 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 540 | static const char *rp, reserved[] = |
| 541 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 542 | char *z = strchr(name, '.'); |
| 543 | if (z) { |
| 544 | size_t l = z-name; |
Rich Felker | 27593d3 | 2013-07-31 15:14:06 -0400 | [diff] [blame] | 545 | for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 546 | if (*rp) { |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 547 | if (ldd_mode) { |
| 548 | /* Track which names have been resolved |
| 549 | * and only report each one once. */ |
| 550 | static unsigned reported; |
| 551 | unsigned mask = 1U<<(rp-reserved); |
| 552 | if (!(reported & mask)) { |
| 553 | reported |= mask; |
| 554 | dprintf(1, "\t%s => %s (%p)\n", |
| 555 | name, ldso->name, |
| 556 | ldso->base); |
| 557 | } |
| 558 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 559 | is_self = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 560 | } |
| 561 | } |
| 562 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 563 | if (!strcmp(name, ldso->name)) is_self = 1; |
| 564 | if (is_self) { |
| 565 | if (!ldso->prev) { |
| 566 | tail->next = ldso; |
| 567 | ldso->prev = tail; |
| 568 | tail = ldso->next ? ldso->next : ldso; |
| 569 | } |
| 570 | return ldso; |
| 571 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 572 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 573 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 574 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 575 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 576 | /* Search for the name to see if it's already loaded */ |
| 577 | for (p=head->next; p; p=p->next) { |
| 578 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 579 | p->refcnt++; |
| 580 | return p; |
| 581 | } |
| 582 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 583 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 584 | fd = -1; |
Rich Felker | 3e3753c | 2013-08-02 10:02:29 -0400 | [diff] [blame] | 585 | if (env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 586 | for (p=needed_by; fd < 0 && p; p=p->needed_by) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 587 | if (!fixup_rpath(p, buf, sizeof buf)) |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 588 | fd = path_open(name, p->rpath, buf, sizeof buf); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 589 | if (fd < 0) { |
| 590 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 591 | char *prefix = 0; |
| 592 | size_t prefix_len; |
| 593 | if (ldso->name[0]=='/') { |
| 594 | char *s, *t, *z; |
| 595 | for (s=t=z=ldso->name; *s; s++) |
| 596 | if (*s=='/') z=t, t=s; |
| 597 | prefix_len = z-ldso->name; |
| 598 | if (prefix_len < PATH_MAX) |
| 599 | prefix = ldso->name; |
| 600 | } |
| 601 | if (!prefix) { |
| 602 | prefix = ""; |
| 603 | prefix_len = 0; |
| 604 | } |
| 605 | char etc_ldso_path[prefix_len + 1 |
| 606 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 607 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 608 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 609 | (int)prefix_len, prefix); |
| 610 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 611 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 612 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 613 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 614 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 615 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 616 | fclose(f); |
Rich Felker | ff4be70 | 2013-09-09 13:39:08 -0400 | [diff] [blame^] | 617 | } else if (errno != ENOENT) { |
| 618 | sys_path = ""; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 619 | } |
| 620 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 621 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 622 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 623 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 624 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 625 | } |
| 626 | if (fd < 0) return 0; |
| 627 | if (fstat(fd, &st) < 0) { |
| 628 | close(fd); |
| 629 | return 0; |
| 630 | } |
| 631 | for (p=head->next; p; p=p->next) { |
| 632 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 633 | /* If this library was previously loaded with a |
| 634 | * pathname but a search found the same inode, |
| 635 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 636 | if (!p->shortname && pathname != name) |
| 637 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 638 | close(fd); |
| 639 | p->refcnt++; |
| 640 | return p; |
| 641 | } |
| 642 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 643 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 644 | close(fd); |
| 645 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 646 | |
| 647 | /* Allocate storage for the new DSO. When there is TLS, this |
| 648 | * storage must include a reservation for all pre-existing |
| 649 | * threads to obtain copies of both the new TLS, and an |
| 650 | * extended DTV capable of storing an additional slot for |
| 651 | * the newly-loaded DSO. */ |
| 652 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 653 | if (runtime && temp_dso.tls_image) { |
| 654 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 655 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 656 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 657 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 658 | else alloc_size += n_th * per_th; |
| 659 | } |
| 660 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 661 | if (!p) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 662 | munmap(map, temp_dso.map_len); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 663 | return 0; |
| 664 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 665 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 666 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 667 | p->dev = st.st_dev; |
| 668 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 669 | p->refcnt = 1; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 670 | p->needed_by = needed_by; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 671 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 672 | strcpy(p->name, pathname); |
| 673 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 674 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 675 | if (p->tls_image) { |
Rich Felker | 017bf14 | 2012-10-07 20:19:11 -0400 | [diff] [blame] | 676 | if (runtime && !__pthread_self_init()) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 677 | munmap(map, p->map_len); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 678 | free(p); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 679 | return 0; |
| 680 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 681 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 682 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 683 | #ifdef TLS_ABOVE_TP |
| 684 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 685 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 686 | tls_offset += p->tls_size; |
| 687 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 688 | tls_offset += p->tls_size + p->tls_align - 1; |
| 689 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 690 | & (p->tls_align-1); |
| 691 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 692 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 693 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 694 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 695 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 696 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 697 | |
| 698 | tail->next = p; |
| 699 | p->prev = tail; |
| 700 | tail = p; |
| 701 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 702 | 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] | 703 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 704 | return p; |
| 705 | } |
| 706 | |
| 707 | static void load_deps(struct dso *p) |
| 708 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 709 | size_t i, ndeps=0; |
| 710 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 711 | for (; p; p=p->next) { |
| 712 | for (i=0; p->dynv[i]; i+=2) { |
| 713 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 714 | dep = load_library(p->strings + p->dynv[i+1], p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 715 | if (!dep) { |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 716 | snprintf(errbuf, sizeof errbuf, |
| 717 | "Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 718 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 719 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 720 | dprintf(2, "%s\n", errbuf); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 721 | ldso_fail = 1; |
| 722 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 723 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 724 | if (runtime) { |
| 725 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 726 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 727 | tmp[ndeps++] = dep; |
| 728 | tmp[ndeps] = 0; |
| 729 | *deps = tmp; |
| 730 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 731 | } |
| 732 | } |
| 733 | } |
| 734 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 735 | static void load_preload(char *s) |
| 736 | { |
| 737 | int tmp; |
| 738 | char *z; |
| 739 | for (z=s; *z; s=z) { |
| 740 | for ( ; *s && isspace(*s); s++); |
| 741 | for (z=s; *z && !isspace(*z); z++); |
| 742 | tmp = *z; |
| 743 | *z = 0; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 744 | load_library(s, 0); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 745 | *z = tmp; |
| 746 | } |
| 747 | } |
| 748 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 749 | static void make_global(struct dso *p) |
| 750 | { |
| 751 | for (; p; p=p->next) p->global = 1; |
| 752 | } |
| 753 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 754 | static void reloc_all(struct dso *p) |
| 755 | { |
| 756 | size_t dyn[DYN_CNT] = {0}; |
| 757 | for (; p; p=p->next) { |
| 758 | if (p->relocated) continue; |
| 759 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | babf820 | 2012-08-05 12:50:26 -0400 | [diff] [blame] | 760 | #ifdef NEED_ARCH_RELOCS |
| 761 | do_arch_relocs(p, head); |
| 762 | #endif |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 763 | do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
| 764 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
| 765 | do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 766 | 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] | 767 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 768 | } |
| 769 | } |
| 770 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 771 | static size_t find_dyn(Phdr *ph, size_t cnt, size_t stride) |
| 772 | { |
| 773 | for (; cnt--; ph = (void *)((char *)ph + stride)) |
| 774 | if (ph->p_type == PT_DYNAMIC) |
| 775 | return ph->p_vaddr; |
| 776 | return 0; |
| 777 | } |
| 778 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 779 | static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p) |
| 780 | { |
| 781 | size_t min_addr = -1, max_addr = 0; |
| 782 | for (; cnt--; ph = (void *)((char *)ph + stride)) { |
| 783 | if (ph->p_type != PT_LOAD) continue; |
| 784 | if (ph->p_vaddr < min_addr) |
| 785 | min_addr = ph->p_vaddr; |
| 786 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 787 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 788 | } |
| 789 | min_addr &= -PAGE_SIZE; |
| 790 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 791 | p->map = p->base + min_addr; |
| 792 | p->map_len = max_addr - min_addr; |
| 793 | } |
| 794 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 795 | static void do_fini() |
| 796 | { |
| 797 | struct dso *p; |
| 798 | size_t dyn[DYN_CNT] = {0}; |
| 799 | for (p=fini_head; p; p=p->fini_next) { |
| 800 | if (!p->constructed) continue; |
| 801 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 802 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 803 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 804 | size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n; |
| 805 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 806 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 807 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 808 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 809 | ((void (*)(void))(p->base + dyn[DT_FINI]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 810 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 811 | } |
| 812 | } |
| 813 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 814 | static void do_init_fini(struct dso *p) |
| 815 | { |
| 816 | size_t dyn[DYN_CNT] = {0}; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 817 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 818 | /* Allow recursive calls that arise when a library calls |
| 819 | * dlopen from one of its constructors, but block any |
| 820 | * other threads until all ctors have finished. */ |
| 821 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 822 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 823 | if (p->constructed) continue; |
| 824 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 825 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 826 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 827 | p->fini_next = fini_head; |
| 828 | fini_head = p; |
| 829 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 830 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 831 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 832 | ((void (*)(void))(p->base + dyn[DT_INIT]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 833 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 834 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 835 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
| 836 | size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]); |
| 837 | while (n--) ((void (*)(void))*fn++)(); |
| 838 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 839 | if (!need_locking && libc.threads_minus_1) { |
| 840 | need_locking = 1; |
| 841 | pthread_mutex_lock(&init_fini_lock); |
| 842 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 843 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 844 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 845 | } |
| 846 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 847 | void _dl_debug_state(void) |
| 848 | { |
| 849 | } |
| 850 | |
Rich Felker | 7c6c290 | 2013-08-03 16:27:30 -0400 | [diff] [blame] | 851 | void __reset_tls() |
| 852 | { |
| 853 | pthread_t self = __pthread_self(); |
| 854 | struct dso *p; |
| 855 | for (p=head; p; p=p->next) { |
| 856 | if (!p->tls_id || !self->dtv[p->tls_id]) continue; |
| 857 | memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len); |
| 858 | memset((char *)self->dtv[p->tls_id]+p->tls_len, 0, |
| 859 | p->tls_size - p->tls_len); |
| 860 | if (p->tls_id == (size_t)self->dtv[0]) break; |
| 861 | } |
| 862 | } |
| 863 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 864 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 865 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 866 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 867 | struct dso *p; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 868 | |
| 869 | if (!tls_cnt) return mem; |
| 870 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 871 | void **dtv = (void *)mem; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 872 | dtv[0] = (void *)tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 873 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 874 | #ifdef TLS_ABOVE_TP |
| 875 | mem += sizeof(void *) * (tls_cnt+1); |
| 876 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 877 | td = (pthread_t)mem; |
| 878 | mem += sizeof(struct pthread); |
| 879 | |
| 880 | for (p=head; p; p=p->next) { |
| 881 | if (!p->tls_id) continue; |
| 882 | dtv[p->tls_id] = mem + p->tls_offset; |
| 883 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 884 | } |
| 885 | #else |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 886 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 887 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 888 | td = (pthread_t)mem; |
| 889 | |
| 890 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 891 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 892 | dtv[p->tls_id] = mem - p->tls_offset; |
| 893 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 894 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 895 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 896 | td->dtv = dtv; |
| 897 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 898 | } |
| 899 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 900 | void *__tls_get_addr(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 901 | { |
| 902 | pthread_t self = __pthread_self(); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 903 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 904 | return (char *)self->dtv[v[0]]+v[1]; |
| 905 | |
| 906 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 907 | sigset_t set; |
Rich Felker | 00902c7 | 2012-10-06 23:57:51 -0400 | [diff] [blame] | 908 | pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 909 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 910 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 911 | return (char *)self->dtv[v[0]]+v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 912 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 913 | |
| 914 | /* This is safe without any locks held because, if the caller |
| 915 | * is able to request the Nth entry of the DTV, the DSO list |
| 916 | * must be valid at least that far out and it was synchronized |
| 917 | * at program startup or by an already-completed call to dlopen. */ |
| 918 | struct dso *p; |
| 919 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 920 | |
| 921 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 922 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 923 | void **newdtv = p->new_dtv + |
| 924 | (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] | 925 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 926 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 927 | newdtv[0] = (void *)v[0]; |
| 928 | self->dtv = newdtv; |
| 929 | } |
| 930 | |
| 931 | /* Get new TLS memory from new DSO */ |
| 932 | unsigned char *mem = p->new_tls + |
| 933 | (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1); |
| 934 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1); |
| 935 | self->dtv[v[0]] = mem; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 936 | memcpy(mem, p->tls_image, p->tls_len); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 937 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 938 | return mem + v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 939 | } |
| 940 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 941 | static void update_tls_size() |
| 942 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 943 | libc.tls_size = ALIGN( |
| 944 | (1+tls_cnt) * sizeof(void *) + |
| 945 | tls_offset + |
| 946 | sizeof(struct pthread) + |
| 947 | tls_align * 2, |
| 948 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 949 | } |
| 950 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 951 | void *__dynlink(int argc, char **argv) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 952 | { |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 953 | size_t aux[AUX_CNT] = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 954 | size_t i; |
| 955 | Phdr *phdr; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 956 | Ehdr *ehdr; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 957 | static struct dso builtin_dsos[3]; |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 958 | struct dso *const app = builtin_dsos+0; |
| 959 | struct dso *const lib = builtin_dsos+1; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 960 | struct dso *const vdso = builtin_dsos+2; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 961 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 962 | size_t vdso_base; |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 963 | size_t *auxv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 964 | char **envp = argv+argc+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 965 | |
| 966 | /* Find aux vector just past environ[] */ |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 967 | for (i=argc+1; argv[i]; i++) |
| 968 | if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16)) |
| 969 | env_path = argv[i]+16; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 970 | else if (!memcmp(argv[i], "LD_PRELOAD=", 11)) |
| 971 | env_preload = argv[i]+11; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 972 | auxv = (void *)(argv+i+1); |
| 973 | |
| 974 | decode_vec(auxv, aux, AUX_CNT); |
| 975 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 976 | /* Only trust user/env if kernel says we're not suid/sgid */ |
| 977 | if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
Rich Felker | a045883 | 2011-08-16 07:46:42 -0400 | [diff] [blame] | 978 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 979 | env_path = 0; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 980 | env_preload = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 981 | libc.secure = 1; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 982 | } |
| 983 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 984 | /* If the dynamic linker was invoked as a program itself, AT_BASE |
| 985 | * will not be set. In that case, we assume the base address is |
| 986 | * the start of the page containing the PHDRs; I don't know any |
| 987 | * better approach... */ |
| 988 | if (!aux[AT_BASE]) { |
| 989 | aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE; |
| 990 | aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0; |
| 991 | } |
| 992 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 993 | /* The dynamic linker load address is passed by the kernel |
| 994 | * in the AUX vector, so this is easy. */ |
| 995 | lib->base = (void *)aux[AT_BASE]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 996 | lib->name = lib->shortname = "libc.so"; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 997 | lib->global = 1; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 998 | lib->kernel_mapped = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 999 | ehdr = (void *)lib->base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1000 | lib->phnum = ehdr->e_phnum; |
| 1001 | lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff); |
| 1002 | find_map_range(lib->phdr, ehdr->e_phnum, ehdr->e_phentsize, lib); |
| 1003 | lib->dynv = (void *)(lib->base + find_dyn(lib->phdr, |
Rich Felker | f44e239 | 2013-07-27 21:37:05 -0400 | [diff] [blame] | 1004 | ehdr->e_phnum, ehdr->e_phentsize)); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1005 | decode_dyn(lib); |
| 1006 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1007 | if (aux[AT_PHDR]) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1008 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1009 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1010 | /* 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] | 1011 | app->phdr = phdr = (void *)aux[AT_PHDR]; |
| 1012 | app->phnum = aux[AT_PHNUM]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1013 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 1014 | if (phdr->p_type == PT_PHDR) |
| 1015 | app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1016 | else if (phdr->p_type == PT_INTERP) |
| 1017 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1018 | else if (phdr->p_type == PT_TLS) { |
| 1019 | tls_image = phdr->p_vaddr; |
| 1020 | app->tls_len = phdr->p_filesz; |
| 1021 | app->tls_size = phdr->p_memsz; |
| 1022 | app->tls_align = phdr->p_align; |
| 1023 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1024 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1025 | if (app->tls_size) app->tls_image = (char *)app->base + tls_image; |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1026 | if (interp_off) lib->name = (char *)app->base + interp_off; |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1027 | if ((aux[0] & (1UL<<AT_EXECFN)) |
| 1028 | && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) |
| 1029 | app->name = (char *)aux[AT_EXECFN]; |
| 1030 | else |
| 1031 | app->name = argv[0]; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 1032 | app->kernel_mapped = 1; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1033 | app->dynv = (void *)(app->base + find_dyn( |
| 1034 | (void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT])); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1035 | find_map_range((void *)aux[AT_PHDR], |
| 1036 | aux[AT_PHNUM], aux[AT_PHENT], app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1037 | } else { |
| 1038 | int fd; |
| 1039 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 1040 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1041 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
| 1042 | *argv++ = (void *)-1; |
| 1043 | if (argv[0] && !strcmp(argv[0], "--")) *argv++ = (void *)-1; |
| 1044 | if (!argv[0]) { |
| 1045 | dprintf(2, "musl libc/dynamic program loader\n"); |
| 1046 | dprintf(2, "usage: %s pathname%s\n", ldname, |
| 1047 | ldd_mode ? "" : " [args]"); |
| 1048 | _exit(1); |
| 1049 | } |
| 1050 | fd = open(argv[0], O_RDONLY); |
| 1051 | if (fd < 0) { |
| 1052 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 1053 | _exit(1); |
| 1054 | } |
| 1055 | runtime = 1; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1056 | ehdr = (void *)map_library(fd, app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1057 | if (!ehdr) { |
| 1058 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 1059 | _exit(1); |
| 1060 | } |
| 1061 | runtime = 0; |
| 1062 | close(fd); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1063 | lib->name = ldname; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1064 | app->name = argv[0]; |
Rich Felker | 876748e | 2013-07-26 14:25:51 -0400 | [diff] [blame] | 1065 | aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry; |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1066 | /* Find the name that would have been used for the dynamic |
| 1067 | * linker had ldd not taken its place. */ |
| 1068 | if (ldd_mode) { |
| 1069 | for (i=0; i<app->phnum; i++) { |
| 1070 | if (app->phdr[i].p_type == PT_INTERP) |
| 1071 | lib->name = (void *)(app->base |
| 1072 | + app->phdr[i].p_vaddr); |
| 1073 | } |
| 1074 | dprintf(1, "\t%s (%p)\n", lib->name, lib->base); |
| 1075 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 1076 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1077 | if (app->tls_size) { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1078 | app->tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1079 | #ifdef TLS_ABOVE_TP |
| 1080 | app->tls_offset = 0; |
| 1081 | tls_offset = app->tls_size |
| 1082 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1083 | & (app->tls_align-1) ); |
| 1084 | #else |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 1085 | tls_offset = app->tls_offset = app->tls_size |
| 1086 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1087 | & (app->tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1088 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1089 | tls_align = MAXP2(tls_align, app->tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1090 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1091 | app->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1092 | decode_dyn(app); |
| 1093 | |
| 1094 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1095 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1096 | ehdr = (void *)vdso_base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1097 | vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 1098 | vdso->phnum = ehdr->e_phnum; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1099 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 1100 | if (phdr->p_type == PT_DYNAMIC) |
| 1101 | vdso->dynv = (void *)(vdso_base + phdr->p_offset); |
| 1102 | if (phdr->p_type == PT_LOAD) |
| 1103 | vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
| 1104 | } |
Rich Felker | 75a31fa | 2012-11-25 20:56:31 -0500 | [diff] [blame] | 1105 | vdso->name = ""; |
| 1106 | vdso->shortname = "linux-gate.so.1"; |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 1107 | vdso->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1108 | decode_dyn(vdso); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1109 | vdso->prev = lib; |
| 1110 | lib->next = vdso; |
| 1111 | } |
| 1112 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1113 | /* Initial dso chain consists only of the app. We temporarily |
| 1114 | * append the dynamic linker/libc so we can relocate it, then |
| 1115 | * restore the initial chain in preparation for loading third |
| 1116 | * party libraries (preload/needed). */ |
| 1117 | head = tail = app; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1118 | ldso = lib; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1119 | app->next = lib; |
| 1120 | reloc_all(lib); |
| 1121 | app->next = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1122 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1123 | /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */ |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1124 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1125 | /* Donate unused parts of app and library mapping to malloc */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1126 | reclaim_gaps(app->base, (void *)aux[AT_PHDR], aux[AT_PHENT], aux[AT_PHNUM]); |
| 1127 | ehdr = (void *)lib->base; |
| 1128 | reclaim_gaps(lib->base, (void *)(lib->base+ehdr->e_phoff), |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1129 | ehdr->e_phentsize, ehdr->e_phnum); |
| 1130 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1131 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | fd7015d | 2012-01-23 18:32:40 -0500 | [diff] [blame] | 1132 | * namespace, and perform all remaining relocations. The main |
| 1133 | * program must be relocated LAST since it may contain copy |
| 1134 | * relocations which depend on libraries' relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1135 | if (env_preload) load_preload(env_preload); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1136 | load_deps(app); |
| 1137 | make_global(app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1138 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1139 | reloc_all(app->next); |
| 1140 | reloc_all(app); |
| 1141 | |
| 1142 | update_tls_size(); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1143 | if (tls_cnt) { |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1144 | void *mem = mmap(0, libc.tls_size, PROT_READ|PROT_WRITE, |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1145 | MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); |
| 1146 | if (mem==MAP_FAILED || |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1147 | !__install_initial_tls(__copy_tls(mem))) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1148 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1149 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1150 | _exit(127); |
| 1151 | } |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1152 | } |
| 1153 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1154 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1155 | if (ldd_mode) _exit(0); |
| 1156 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1157 | /* Switch to runtime mode: any further failures in the dynamic |
| 1158 | * linker are a reportable failure rather than a fatal startup |
| 1159 | * error. If the dynamic loader (dlopen) will not be used, free |
| 1160 | * all memory used by the dynamic linker. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1161 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1162 | |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 1163 | #ifndef DYNAMIC_IS_RO |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1164 | for (i=0; app->dynv[i]; i+=2) |
| 1165 | if (app->dynv[i]==DT_DEBUG) |
| 1166 | app->dynv[i+1] = (size_t)&debug; |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 1167 | #endif |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1168 | debug.ver = 1; |
| 1169 | debug.bp = _dl_debug_state; |
| 1170 | debug.head = head; |
| 1171 | debug.base = lib->base; |
| 1172 | debug.state = 0; |
| 1173 | _dl_debug_state(); |
| 1174 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 1175 | if (ssp_used) __init_ssp((void *)aux[AT_RANDOM]); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1176 | __init_libc(envp, argv[0]); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1177 | atexit(do_fini); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1178 | errno = 0; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1179 | do_init_fini(tail); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1180 | |
| 1181 | return (void *)aux[AT_ENTRY]; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1182 | } |
| 1183 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1184 | void *dlopen(const char *file, int mode) |
| 1185 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1186 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1187 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1188 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1189 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1190 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1191 | |
| 1192 | if (!file) return head; |
| 1193 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1194 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1195 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1196 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1197 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1198 | p = 0; |
| 1199 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1200 | orig_tls_offset = tls_offset; |
| 1201 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1202 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1203 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1204 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1205 | rtld_fail = &jb; |
| 1206 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1207 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1208 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1209 | if (p->deps[i]->global < 0) |
| 1210 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1211 | for (p=orig_tail->next; p; p=next) { |
| 1212 | next = p->next; |
| 1213 | munmap(p->map, p->map_len); |
| 1214 | free(p->deps); |
| 1215 | free(p); |
| 1216 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1217 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1218 | tls_offset = orig_tls_offset; |
| 1219 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1220 | tail = orig_tail; |
| 1221 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1222 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1223 | errflag = 1; |
| 1224 | goto end; |
Rich Felker | 0f9b1f6 | 2013-08-23 23:13:25 -0400 | [diff] [blame] | 1225 | } else p = load_library(file, head); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1226 | |
| 1227 | if (!p) { |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1228 | snprintf(errbuf, sizeof errbuf, noload ? |
| 1229 | "Library %s is not already loaded" : |
| 1230 | "Error loading shared library %s: %m", |
| 1231 | file); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1232 | errflag = 1; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1233 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1234 | } |
| 1235 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1236 | /* First load handling */ |
| 1237 | if (!p->deps) { |
| 1238 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1239 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1240 | if (!p->deps[i]->global) |
| 1241 | p->deps[i]->global = -1; |
| 1242 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1243 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1244 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1245 | if (p->deps[i]->global < 0) |
| 1246 | p->deps[i]->global = 0; |
| 1247 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1248 | } |
| 1249 | |
| 1250 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1251 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1252 | p->deps[i]->global = 1; |
| 1253 | p->global = 1; |
| 1254 | } |
| 1255 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1256 | update_tls_size(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1257 | |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 1258 | if (ssp_used) __init_ssp(libc.auxv); |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 1259 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1260 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1261 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1262 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1263 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1264 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1265 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1266 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1267 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1268 | return p; |
| 1269 | } |
| 1270 | |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1271 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1272 | { |
| 1273 | struct dso *p; |
| 1274 | for (p=head; p; p=p->next) if (h==p) return 0; |
| 1275 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1276 | errflag = 1; |
| 1277 | return 1; |
| 1278 | } |
| 1279 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1280 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1281 | { |
| 1282 | size_t i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1283 | uint32_t h = 0, gh = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1284 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1285 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1286 | if (p == RTLD_DEFAULT) { |
| 1287 | p = head; |
| 1288 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1289 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1290 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1291 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1292 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1293 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1294 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1295 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1296 | 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] | 1297 | return def.dso->base + def.sym->st_value; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1298 | } |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1299 | if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p)) |
| 1300 | return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1301 | if (p->ghashtab) { |
| 1302 | gh = gnu_hash(s); |
| 1303 | sym = gnu_lookup(s, gh, p); |
| 1304 | } else { |
| 1305 | h = sysv_hash(s); |
| 1306 | sym = sysv_lookup(s, h, p); |
| 1307 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1308 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1309 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1310 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1311 | return p->base + sym->st_value; |
| 1312 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1313 | if (p->deps[i]->ghashtab) { |
| 1314 | if (!gh) gh = gnu_hash(s); |
Rich Felker | a5d6199 | 2012-08-25 17:40:27 -0400 | [diff] [blame] | 1315 | sym = gnu_lookup(s, gh, p->deps[i]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1316 | } else { |
| 1317 | if (!h) h = sysv_hash(s); |
| 1318 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1319 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1320 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1321 | 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] | 1322 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1323 | return p->deps[i]->base + sym->st_value; |
| 1324 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1325 | failed: |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1326 | errflag = 1; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1327 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1328 | return 0; |
| 1329 | } |
| 1330 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1331 | int __dladdr(void *addr, Dl_info *info) |
| 1332 | { |
| 1333 | struct dso *p; |
| 1334 | Sym *sym; |
| 1335 | uint32_t nsym; |
| 1336 | char *strings; |
| 1337 | size_t i; |
| 1338 | void *best = 0; |
| 1339 | char *bestname; |
| 1340 | |
| 1341 | pthread_rwlock_rdlock(&lock); |
| 1342 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1343 | pthread_rwlock_unlock(&lock); |
| 1344 | |
| 1345 | if (!p) return 0; |
| 1346 | |
| 1347 | sym = p->syms; |
| 1348 | strings = p->strings; |
| 1349 | if (p->hashtab) { |
| 1350 | nsym = p->hashtab[1]; |
| 1351 | } else { |
| 1352 | uint32_t *buckets; |
| 1353 | uint32_t *hashval; |
| 1354 | buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 1355 | sym += p->ghashtab[1]; |
| 1356 | for (i = 0; i < p->ghashtab[0]; i++) { |
| 1357 | if (buckets[i] > nsym) |
| 1358 | nsym = buckets[i]; |
| 1359 | } |
| 1360 | if (nsym) { |
| 1361 | nsym -= p->ghashtab[1]; |
| 1362 | hashval = buckets + p->ghashtab[0] + nsym; |
| 1363 | do nsym++; |
| 1364 | while (!(*hashval++ & 1)); |
| 1365 | } |
| 1366 | } |
| 1367 | |
| 1368 | for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1369 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1370 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1371 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
| 1372 | void *symaddr = p->base + sym->st_value; |
| 1373 | if (symaddr > addr || symaddr < best) |
| 1374 | continue; |
| 1375 | best = symaddr; |
| 1376 | bestname = strings + sym->st_name; |
| 1377 | if (addr == symaddr) |
| 1378 | break; |
| 1379 | } |
| 1380 | } |
| 1381 | |
| 1382 | if (!best) return 0; |
| 1383 | |
| 1384 | info->dli_fname = p->name; |
| 1385 | info->dli_fbase = p->base; |
| 1386 | info->dli_sname = bestname; |
| 1387 | info->dli_saddr = best; |
| 1388 | |
| 1389 | return 1; |
| 1390 | } |
| 1391 | |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1392 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1393 | { |
| 1394 | void *res; |
| 1395 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1396 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1397 | pthread_rwlock_unlock(&lock); |
| 1398 | return res; |
| 1399 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1400 | |
| 1401 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1402 | { |
| 1403 | struct dso *current; |
| 1404 | struct dl_phdr_info info; |
| 1405 | int ret = 0; |
| 1406 | for(current = head; current;) { |
| 1407 | info.dlpi_addr = (uintptr_t)current->base; |
| 1408 | info.dlpi_name = current->name; |
| 1409 | info.dlpi_phdr = current->phdr; |
| 1410 | info.dlpi_phnum = current->phnum; |
| 1411 | info.dlpi_adds = gencnt; |
| 1412 | info.dlpi_subs = 0; |
| 1413 | info.dlpi_tls_modid = current->tls_id; |
| 1414 | info.dlpi_tls_data = current->tls_image; |
| 1415 | |
| 1416 | ret = (callback)(&info, sizeof (info), data); |
| 1417 | |
| 1418 | if (ret != 0) break; |
| 1419 | |
| 1420 | pthread_rwlock_rdlock(&lock); |
| 1421 | current = current->next; |
| 1422 | pthread_rwlock_unlock(&lock); |
| 1423 | } |
| 1424 | return ret; |
| 1425 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1426 | #else |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1427 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1428 | { |
| 1429 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1430 | errflag = 1; |
| 1431 | return 1; |
| 1432 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1433 | void *dlopen(const char *file, int mode) |
| 1434 | { |
| 1435 | return 0; |
| 1436 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1437 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1438 | { |
| 1439 | return 0; |
| 1440 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1441 | int __dladdr (void *addr, Dl_info *info) |
| 1442 | { |
| 1443 | return 0; |
| 1444 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1445 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1446 | |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1447 | int __dlinfo(void *dso, int req, void *res) |
| 1448 | { |
| 1449 | if (invalid_dso_handle(dso)) return -1; |
| 1450 | if (req != RTLD_DI_LINKMAP) { |
| 1451 | snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req); |
| 1452 | errflag = 1; |
| 1453 | return -1; |
| 1454 | } |
| 1455 | *(struct link_map **)res = dso; |
| 1456 | return 0; |
| 1457 | } |
| 1458 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1459 | char *dlerror() |
| 1460 | { |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1461 | if (!errflag) return 0; |
| 1462 | errflag = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1463 | return errbuf; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1464 | } |
| 1465 | |
| 1466 | int dlclose(void *p) |
| 1467 | { |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1468 | return invalid_dso_handle(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1469 | } |