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> |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame] | 4 | #include <stdarg.h> |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 5 | #include <stddef.h> |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 6 | #include <string.h> |
| 7 | #include <unistd.h> |
| 8 | #include <stdint.h> |
| 9 | #include <elf.h> |
| 10 | #include <sys/mman.h> |
| 11 | #include <limits.h> |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 12 | #include <fcntl.h> |
| 13 | #include <sys/stat.h> |
| 14 | #include <errno.h> |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 15 | #include <link.h> |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 16 | #include <setjmp.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 17 | #include <pthread.h> |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 18 | #include <ctype.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 19 | #include <dlfcn.h> |
Rich Felker | 8431d79 | 2012-10-04 16:35:46 -0400 | [diff] [blame] | 20 | #include "pthread_impl.h" |
| 21 | #include "libc.h" |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 22 | #include "dynlink.h" |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 23 | |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 24 | static void error(const char *, ...); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 25 | |
Rich Felker | e864a29 | 2012-07-11 01:47:30 -0400 | [diff] [blame] | 26 | #ifdef SHARED |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 27 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 28 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 29 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 30 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 31 | struct debug { |
| 32 | int ver; |
| 33 | void *head; |
| 34 | void (*bp)(void); |
| 35 | int state; |
| 36 | void *base; |
| 37 | }; |
| 38 | |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 39 | struct td_index { |
| 40 | size_t args[2]; |
| 41 | struct td_index *next; |
| 42 | }; |
| 43 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 44 | struct dso { |
| 45 | unsigned char *base; |
| 46 | char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 47 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 48 | struct dso *next, *prev; |
| 49 | |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 50 | Phdr *phdr; |
| 51 | int phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 52 | size_t phentsize; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 53 | int refcnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 54 | Sym *syms; |
Rich Felker | 596d60c | 2011-06-18 22:52:01 -0400 | [diff] [blame] | 55 | uint32_t *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 56 | uint32_t *ghashtab; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 57 | int16_t *versym; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 58 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 59 | unsigned char *map; |
| 60 | size_t map_len; |
| 61 | dev_t dev; |
| 62 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 63 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 64 | char relocated; |
| 65 | char constructed; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 66 | char kernel_mapped; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 67 | struct dso **deps, *needed_by; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 68 | char *rpath_orig, *rpath; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 69 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 70 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 71 | size_t relro_start, relro_end; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 72 | void **new_dtv; |
| 73 | unsigned char *new_tls; |
Rich Felker | 56fbaa3 | 2015-03-03 22:50:02 -0500 | [diff] [blame] | 74 | volatile int new_dtv_idx, new_tls_idx; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 75 | struct td_index *td_index; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 76 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 77 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 78 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 79 | }; |
| 80 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 81 | struct symdef { |
| 82 | Sym *sym; |
| 83 | struct dso *dso; |
| 84 | }; |
| 85 | |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 86 | int __init_tp(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 87 | void __init_libc(char **, char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 88 | |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 89 | const char *__libc_get_version(void); |
| 90 | |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame] | 91 | static struct builtin_tls { |
| 92 | char c; |
| 93 | struct pthread pt; |
| 94 | void *space[16]; |
| 95 | } builtin_tls[1]; |
| 96 | #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt) |
| 97 | |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 98 | #define ADDEND_LIMIT 4096 |
| 99 | static size_t *saved_addends, *apply_addends_to; |
| 100 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 101 | static struct dso ldso; |
| 102 | static struct dso *head, *tail, *fini_head; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 103 | static char *env_path, *sys_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 104 | static unsigned long long gencnt; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 105 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 106 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 107 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 108 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 109 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 110 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 111 | static struct debug debug; |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame] | 112 | static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 113 | static size_t static_tls_cnt; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 114 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 115 | |
| 116 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 117 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 118 | static int dl_strcmp(const char *l, const char *r) |
| 119 | { |
| 120 | for (; *l==*r && *l; l++, r++); |
| 121 | return *(unsigned char *)l - *(unsigned char *)r; |
| 122 | } |
| 123 | #define strcmp(l,r) dl_strcmp(l,r) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 124 | |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 125 | /* Compute load address for a virtual address in a given dso. */ |
| 126 | #define laddr(p, v) (void *)((p)->base + (v)) |
| 127 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 128 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 129 | { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 130 | size_t i; |
| 131 | for (i=0; i<cnt; i++) a[i] = 0; |
| 132 | for (; v[0]; v+=2) if (v[0]-1<cnt-1) { |
| 133 | a[0] |= 1UL<<v[0]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 134 | a[v[0]] = v[1]; |
| 135 | } |
| 136 | } |
| 137 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 138 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 139 | { |
| 140 | for (; v[0]!=key; v+=2) |
| 141 | if (!v[0]) return 0; |
| 142 | *r = v[1]; |
| 143 | return 1; |
| 144 | } |
| 145 | |
| 146 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 147 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 148 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 149 | uint_fast32_t h = 0; |
| 150 | while (*s) { |
| 151 | h = 16*h + *s++; |
| 152 | h ^= h>>24 & 0xf0; |
| 153 | } |
| 154 | return h & 0xfffffff; |
| 155 | } |
| 156 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 157 | static uint32_t gnu_hash(const char *s0) |
| 158 | { |
| 159 | const unsigned char *s = (void *)s0; |
| 160 | uint_fast32_t h = 5381; |
| 161 | for (; *s; s++) |
Alexander Monakov | 66d4578 | 2015-06-28 02:48:30 +0300 | [diff] [blame] | 162 | h += h*32 + *s; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 163 | return h; |
| 164 | } |
| 165 | |
| 166 | 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] | 167 | { |
| 168 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 169 | Sym *syms = dso->syms; |
| 170 | uint32_t *hashtab = dso->hashtab; |
| 171 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 172 | 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] | 173 | if ((!dso->versym || dso->versym[i] >= 0) |
| 174 | && (!strcmp(s, strings+syms[i].st_name))) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 175 | return syms+i; |
| 176 | } |
| 177 | return 0; |
| 178 | } |
| 179 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 180 | static Sym *gnu_lookup(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s) |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 181 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 182 | uint32_t nbuckets = hashtab[0]; |
| 183 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 184 | uint32_t i = buckets[h1 % nbuckets]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 185 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 186 | if (!i) return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 187 | |
Alexander Monakov | 5b4286e | 2015-06-28 02:48:32 +0300 | [diff] [blame] | 188 | uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 189 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 190 | for (h1 |= 1; ; i++) { |
Alexander Monakov | 5b4286e | 2015-06-28 02:48:32 +0300 | [diff] [blame] | 191 | uint32_t h2 = *hashval++; |
| 192 | if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0) |
| 193 | && !strcmp(s, dso->strings + dso->syms[i].st_name)) |
| 194 | return dso->syms+i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 195 | if (h2 & 1) break; |
| 196 | } |
| 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 201 | static Sym *gnu_lookup_filtered(uint32_t h1, uint32_t *hashtab, struct dso *dso, const char *s, uint32_t fofs, size_t fmask) |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 202 | { |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 203 | const size_t *bloomwords = (const void *)(hashtab+4); |
| 204 | size_t f = bloomwords[fofs & (hashtab[2]-1)]; |
| 205 | if (!(f & fmask)) return 0; |
| 206 | |
| 207 | f >>= (h1 >> hashtab[3]) % (8 * sizeof f); |
| 208 | if (!(f & 1)) return 0; |
| 209 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 210 | return gnu_lookup(h1, hashtab, dso, s); |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 211 | } |
| 212 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 213 | #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] | 214 | #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] | 215 | |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 216 | #ifndef ARCH_SYM_REJECT_UND |
| 217 | #define ARCH_SYM_REJECT_UND(s) 0 |
| 218 | #endif |
| 219 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 220 | 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] | 221 | { |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 222 | uint32_t h = 0, gh, gho, *ght; |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 223 | size_t ghm = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 224 | struct symdef def = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 225 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 226 | Sym *sym; |
| 227 | if (!dso->global) continue; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 228 | if ((ght = dso->ghashtab)) { |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 229 | if (!ghm) { |
| 230 | gh = gnu_hash(s); |
| 231 | int maskbits = 8 * sizeof ghm; |
| 232 | gho = gh / maskbits; |
| 233 | ghm = 1ul << gh % maskbits; |
| 234 | } |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 235 | sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 236 | } else { |
| 237 | if (!h) h = sysv_hash(s); |
| 238 | sym = sysv_lookup(s, h, dso); |
| 239 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 240 | if (!sym) continue; |
| 241 | if (!sym->st_shndx) |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 242 | if (need_def || (sym->st_info&0xf) == STT_TLS |
| 243 | || ARCH_SYM_REJECT_UND(sym)) |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 244 | continue; |
| 245 | if (!sym->st_value) |
| 246 | if ((sym->st_info&0xf) != STT_TLS) |
| 247 | continue; |
| 248 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 249 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
| 250 | |
| 251 | if (def.sym && sym->st_info>>4 == STB_WEAK) continue; |
| 252 | def.sym = sym; |
| 253 | def.dso = dso; |
| 254 | if (sym->st_info>>4 == STB_GLOBAL) break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 255 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 256 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 257 | } |
| 258 | |
Rich Felker | 1b1cafa | 2015-04-17 23:29:45 -0400 | [diff] [blame] | 259 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 260 | ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic(); |
| 261 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 262 | 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] | 263 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 264 | unsigned char *base = dso->base; |
| 265 | Sym *syms = dso->syms; |
| 266 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 267 | Sym *sym; |
| 268 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 269 | void *ctx; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 270 | int type; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 271 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 272 | struct symdef def; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 273 | size_t *reloc_addr; |
| 274 | size_t sym_val; |
| 275 | size_t tls_val; |
| 276 | size_t addend; |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 277 | int skip_relative = 0, reuse_addends = 0, save_slot = 0; |
| 278 | |
| 279 | if (dso == &ldso) { |
| 280 | /* Only ldso's REL table needs addend saving/reuse. */ |
| 281 | if (rel == apply_addends_to) |
| 282 | reuse_addends = 1; |
| 283 | skip_relative = 1; |
| 284 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 285 | |
| 286 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 287 | if (skip_relative && IS_RELATIVE(rel[1])) continue; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 288 | type = R_TYPE(rel[1]); |
Rich Felker | b6a6cd7 | 2015-06-04 11:45:17 -0400 | [diff] [blame] | 289 | if (type == REL_NONE) continue; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 290 | sym_index = R_SYM(rel[1]); |
Rich Felker | a735f53 | 2015-09-17 17:50:43 +0000 | [diff] [blame] | 291 | reloc_addr = laddr(dso, rel[0]); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 292 | if (sym_index) { |
| 293 | sym = syms + sym_index; |
| 294 | name = strings + sym->st_name; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 295 | ctx = type==REL_COPY ? head->next : head; |
| 296 | def = find_sym(ctx, name, type==REL_PLT); |
Rich Felker | 69003e0 | 2014-01-21 00:36:35 -0500 | [diff] [blame] | 297 | if (!def.sym && (sym->st_shndx != SHN_UNDEF |
| 298 | || sym->st_info>>4 != STB_WEAK)) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 299 | error("Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 300 | dso->name, name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 301 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 302 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 303 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 304 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 305 | sym = 0; |
| 306 | def.sym = 0; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 307 | def.dso = dso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 308 | } |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 309 | |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 310 | if (stride > 2) { |
| 311 | addend = rel[2]; |
| 312 | } else if (type==REL_GOT || type==REL_PLT|| type==REL_COPY) { |
| 313 | addend = 0; |
| 314 | } else if (reuse_addends) { |
| 315 | /* Save original addend in stage 2 where the dso |
| 316 | * chain consists of just ldso; otherwise read back |
| 317 | * saved addend since the inline one was clobbered. */ |
| 318 | if (head==&ldso) |
| 319 | saved_addends[save_slot] = *reloc_addr; |
| 320 | addend = saved_addends[save_slot++]; |
| 321 | } else { |
| 322 | addend = *reloc_addr; |
| 323 | } |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 324 | |
Rich Felker | a735f53 | 2015-09-17 17:50:43 +0000 | [diff] [blame] | 325 | sym_val = def.sym ? (size_t)laddr(def.dso, def.sym->st_value) : 0; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 326 | tls_val = def.sym ? def.sym->st_value : 0; |
| 327 | |
| 328 | switch(type) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 329 | case REL_NONE: |
| 330 | break; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 331 | case REL_OFFSET: |
| 332 | addend -= (size_t)reloc_addr; |
| 333 | case REL_SYMBOLIC: |
| 334 | case REL_GOT: |
| 335 | case REL_PLT: |
| 336 | *reloc_addr = sym_val + addend; |
| 337 | break; |
| 338 | case REL_RELATIVE: |
| 339 | *reloc_addr = (size_t)base + addend; |
| 340 | break; |
| 341 | case REL_SYM_OR_REL: |
| 342 | if (sym) *reloc_addr = sym_val + addend; |
| 343 | else *reloc_addr = (size_t)base + addend; |
| 344 | break; |
| 345 | case REL_COPY: |
| 346 | memcpy(reloc_addr, (void *)sym_val, sym->st_size); |
| 347 | break; |
| 348 | case REL_OFFSET32: |
| 349 | *(uint32_t *)reloc_addr = sym_val + addend |
| 350 | - (size_t)reloc_addr; |
| 351 | break; |
| 352 | case REL_DTPMOD: |
| 353 | *reloc_addr = def.dso->tls_id; |
| 354 | break; |
| 355 | case REL_DTPOFF: |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 356 | *reloc_addr = tls_val + addend - DTP_OFFSET; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 357 | break; |
| 358 | #ifdef TLS_ABOVE_TP |
| 359 | case REL_TPOFF: |
| 360 | *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend; |
| 361 | break; |
| 362 | #else |
| 363 | case REL_TPOFF: |
| 364 | *reloc_addr = tls_val - def.dso->tls_offset + addend; |
| 365 | break; |
| 366 | case REL_TPOFF_NEG: |
| 367 | *reloc_addr = def.dso->tls_offset - tls_val + addend; |
| 368 | break; |
| 369 | #endif |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 370 | case REL_TLSDESC: |
| 371 | if (stride<3) addend = reloc_addr[1]; |
| 372 | if (runtime && def.dso->tls_id >= static_tls_cnt) { |
| 373 | struct td_index *new = malloc(sizeof *new); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 374 | if (!new) { |
| 375 | error( |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 376 | "Error relocating %s: cannot allocate TLSDESC for %s", |
| 377 | dso->name, sym ? name : "(local)" ); |
Rich Felker | c5ab5bd | 2015-04-21 13:22:48 -0400 | [diff] [blame] | 378 | longjmp(*rtld_fail, 1); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 379 | } |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 380 | new->next = dso->td_index; |
| 381 | dso->td_index = new; |
| 382 | new->args[0] = def.dso->tls_id; |
| 383 | new->args[1] = tls_val + addend; |
| 384 | reloc_addr[0] = (size_t)__tlsdesc_dynamic; |
| 385 | reloc_addr[1] = (size_t)new; |
| 386 | } else { |
| 387 | reloc_addr[0] = (size_t)__tlsdesc_static; |
| 388 | #ifdef TLS_ABOVE_TP |
| 389 | reloc_addr[1] = tls_val + def.dso->tls_offset |
| 390 | + TPOFF_K + addend; |
| 391 | #else |
| 392 | reloc_addr[1] = tls_val - def.dso->tls_offset |
| 393 | + addend; |
| 394 | #endif |
| 395 | } |
| 396 | break; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 397 | default: |
| 398 | error("Error relocating %s: unsupported relocation type %d", |
| 399 | dso->name, type); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 400 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 401 | continue; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 402 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 403 | } |
| 404 | } |
| 405 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 406 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 407 | * needing at least a page of dirty memory even if they have no global |
| 408 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 409 | * and "donate" them to the heap by setting up minimal malloc |
| 410 | * structures and then freeing them. */ |
| 411 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 412 | static void reclaim(struct dso *dso, size_t start, size_t end) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 413 | { |
| 414 | size_t *a, *z; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 415 | if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end; |
| 416 | if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 417 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 418 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 419 | if (start>end || end-start < 4*sizeof(size_t)) return; |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 420 | a = laddr(dso, start); |
| 421 | z = laddr(dso, end); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 422 | a[-2] = 1; |
| 423 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 424 | z[1] = 1; |
| 425 | free(a); |
| 426 | } |
| 427 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 428 | static void reclaim_gaps(struct dso *dso) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 429 | { |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 430 | Phdr *ph = dso->phdr; |
| 431 | size_t phcnt = dso->phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 432 | |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 433 | for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) { |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 434 | if (ph->p_type!=PT_LOAD) continue; |
| 435 | if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 436 | reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 437 | reclaim(dso, ph->p_vaddr+ph->p_memsz, |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 438 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 439 | } |
| 440 | } |
| 441 | |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 442 | static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off) |
| 443 | { |
| 444 | char *q = mmap(p, n, prot, flags, fd, off); |
| 445 | if (q != MAP_FAILED || errno != EINVAL) return q; |
| 446 | /* Fallbacks for MAP_FIXED failure on NOMMU kernels. */ |
| 447 | if (flags & MAP_ANONYMOUS) { |
| 448 | memset(p, 0, n); |
| 449 | return p; |
| 450 | } |
| 451 | ssize_t r; |
| 452 | if (lseek(fd, off, SEEK_SET) < 0) return MAP_FAILED; |
| 453 | for (q=p; n; q+=r, off+=r, n-=r) { |
| 454 | r = read(fd, q, n); |
| 455 | if (r < 0 && errno != EINTR) return MAP_FAILED; |
| 456 | if (!r) { |
| 457 | memset(q, 0, n); |
| 458 | break; |
| 459 | } |
| 460 | } |
| 461 | return p; |
| 462 | } |
| 463 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 464 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 465 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 466 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 467 | void *allocated_buf=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 468 | size_t phsize; |
| 469 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 470 | size_t this_min, this_max; |
| 471 | off_t off_start; |
| 472 | Ehdr *eh; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 473 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 474 | unsigned prot; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 475 | unsigned char *map=MAP_FAILED, *base; |
Rich Felker | 7443dd2 | 2013-08-02 09:25:12 -0400 | [diff] [blame] | 476 | size_t dyn=0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 477 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 478 | size_t i; |
| 479 | |
| 480 | ssize_t l = read(fd, buf, sizeof buf); |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 481 | eh = buf; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 482 | if (l<0) return 0; |
| 483 | if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) |
| 484 | goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 485 | phsize = eh->e_phentsize * eh->e_phnum; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 486 | if (phsize > sizeof buf - sizeof *eh) { |
| 487 | allocated_buf = malloc(phsize); |
| 488 | if (!allocated_buf) return 0; |
| 489 | l = pread(fd, allocated_buf, phsize, eh->e_phoff); |
| 490 | if (l < 0) goto error; |
| 491 | if (l != phsize) goto noexec; |
| 492 | ph = ph0 = allocated_buf; |
| 493 | } else if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 494 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 495 | if (l < 0) goto error; |
| 496 | if (l != phsize) goto noexec; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 497 | ph = ph0 = (void *)(buf + 1); |
| 498 | } else { |
| 499 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 500 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 501 | for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 502 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 503 | dyn = ph->p_vaddr; |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 504 | } else if (ph->p_type == PT_TLS) { |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 505 | tls_image = ph->p_vaddr; |
| 506 | dso->tls_align = ph->p_align; |
| 507 | dso->tls_len = ph->p_filesz; |
| 508 | dso->tls_size = ph->p_memsz; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 509 | } else if (ph->p_type == PT_GNU_RELRO) { |
| 510 | dso->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 511 | dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 512 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 513 | if (ph->p_type != PT_LOAD) continue; |
| 514 | if (ph->p_vaddr < addr_min) { |
| 515 | addr_min = ph->p_vaddr; |
| 516 | off_start = ph->p_offset; |
| 517 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 518 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 519 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 520 | } |
| 521 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 522 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 523 | } |
| 524 | } |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 525 | if (!dyn) goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 526 | addr_max += PAGE_SIZE-1; |
| 527 | addr_max &= -PAGE_SIZE; |
| 528 | addr_min &= -PAGE_SIZE; |
| 529 | off_start &= -PAGE_SIZE; |
| 530 | map_len = addr_max - addr_min + off_start; |
| 531 | /* The first time, we map too much, possibly even more than |
| 532 | * the length of the file. This is okay because we will not |
| 533 | * use the invalid part; we just need to reserve the right |
| 534 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 535 | 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] | 536 | if (map==MAP_FAILED) goto error; |
Rich Felker | 339516a | 2013-07-31 14:42:08 -0400 | [diff] [blame] | 537 | /* If the loaded file is not relocatable and the requested address is |
| 538 | * not available, then the load operation must fail. */ |
| 539 | if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { |
| 540 | errno = EBUSY; |
| 541 | goto error; |
| 542 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 543 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 544 | dso->phdr = 0; |
| 545 | dso->phnum = 0; |
| 546 | 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] | 547 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 548 | /* Check if the programs headers are in this load segment, and |
| 549 | * if so, record the address for use by dl_iterate_phdr. */ |
| 550 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 551 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 552 | dso->phdr = (void *)(base + ph->p_vaddr |
| 553 | + (eh->e_phoff-ph->p_offset)); |
| 554 | dso->phnum = eh->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 555 | dso->phentsize = eh->e_phentsize; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 556 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 557 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 558 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 559 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 560 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 561 | off_start = ph->p_offset & -PAGE_SIZE; |
| 562 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 563 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 564 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 565 | if (mmap_fixed(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 566 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 567 | if (ph->p_memsz > ph->p_filesz) { |
| 568 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 569 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 570 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 571 | if (pgbrk-(size_t)base < this_max && mmap_fixed((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 572 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 573 | } |
| 574 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 575 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 576 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | 75eceb3 | 2015-06-17 17:21:46 +0000 | [diff] [blame] | 577 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) |
| 578 | && errno != ENOSYS) |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 579 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 580 | break; |
| 581 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 582 | dso->map = map; |
| 583 | dso->map_len = map_len; |
| 584 | dso->base = base; |
| 585 | dso->dynv = (void *)(base+dyn); |
| 586 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 587 | if (!runtime) reclaim_gaps(dso); |
Rich Felker | 8d01dfc | 2013-08-02 09:59:02 -0400 | [diff] [blame] | 588 | free(allocated_buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 589 | return map; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 590 | noexec: |
| 591 | errno = ENOEXEC; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 592 | error: |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 593 | if (map!=MAP_FAILED) munmap(map, map_len); |
| 594 | free(allocated_buf); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 595 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 596 | } |
| 597 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 598 | 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] | 599 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 600 | size_t l; |
| 601 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 602 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 603 | s += strspn(s, ":\n"); |
| 604 | l = strcspn(s, ":\n"); |
| 605 | if (l-1 >= INT_MAX) return -1; |
Rich Felker | 5d1c8c9 | 2015-04-01 20:27:29 -0400 | [diff] [blame] | 606 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) { |
| 607 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
| 608 | switch (errno) { |
| 609 | case ENOENT: |
| 610 | case ENOTDIR: |
| 611 | case EACCES: |
| 612 | case ENAMETOOLONG: |
| 613 | break; |
| 614 | default: |
| 615 | /* Any negative value but -1 will inhibit |
| 616 | * futher path search. */ |
| 617 | return -2; |
| 618 | } |
| 619 | } |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 620 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 621 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 622 | } |
| 623 | |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 624 | static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) |
| 625 | { |
| 626 | size_t n, l; |
| 627 | const char *s, *t, *origin; |
| 628 | char *d; |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 629 | if (p->rpath || !p->rpath_orig) return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 630 | if (!strchr(p->rpath_orig, '$')) { |
| 631 | p->rpath = p->rpath_orig; |
| 632 | return 0; |
| 633 | } |
| 634 | n = 0; |
| 635 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 636 | while ((t=strchr(s, '$'))) { |
| 637 | if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 638 | return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 639 | s = t+1; |
| 640 | n++; |
| 641 | } |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 642 | if (n > SSIZE_MAX/PATH_MAX) return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 643 | |
| 644 | if (p->kernel_mapped) { |
| 645 | /* $ORIGIN searches cannot be performed for the main program |
| 646 | * when it is suid/sgid/AT_SECURE. This is because the |
| 647 | * pathname is under the control of the caller of execve. |
| 648 | * For libraries, however, $ORIGIN can be processed safely |
| 649 | * since the library's pathname came from a trusted source |
| 650 | * (either system paths or a call to dlopen). */ |
| 651 | if (libc.secure) |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 652 | return 0; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 653 | l = readlink("/proc/self/exe", buf, buf_size); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 654 | if (l == -1) switch (errno) { |
| 655 | case ENOENT: |
| 656 | case ENOTDIR: |
| 657 | case EACCES: |
| 658 | break; |
| 659 | default: |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 660 | return -1; |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 661 | } |
| 662 | if (l >= buf_size) |
| 663 | return 0; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 664 | buf[l] = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 665 | origin = buf; |
| 666 | } else { |
| 667 | origin = p->name; |
| 668 | } |
| 669 | t = strrchr(origin, '/'); |
| 670 | l = t ? t-origin : 0; |
| 671 | p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); |
| 672 | if (!p->rpath) return -1; |
| 673 | |
| 674 | d = p->rpath; |
| 675 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 676 | while ((t=strchr(s, '$'))) { |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 677 | memcpy(d, s, t-s); |
| 678 | d += t-s; |
| 679 | memcpy(d, origin, l); |
| 680 | d += l; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 681 | /* It was determined previously that the '$' is followed |
| 682 | * either by "ORIGIN" or "{ORIGIN}". */ |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 683 | s = t + 7 + 2*(t[1]=='{'); |
| 684 | } |
| 685 | strcpy(d, s); |
| 686 | return 0; |
| 687 | } |
| 688 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 689 | static void decode_dyn(struct dso *p) |
| 690 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 691 | size_t dyn[DYN_CNT]; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 692 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 693 | p->syms = laddr(p, dyn[DT_SYMTAB]); |
| 694 | p->strings = laddr(p, dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 695 | if (dyn[0]&(1<<DT_HASH)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 696 | p->hashtab = laddr(p, dyn[DT_HASH]); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 697 | if (dyn[0]&(1<<DT_RPATH)) |
Rich Felker | e6076c9 | 2015-09-17 19:21:55 +0000 | [diff] [blame] | 698 | p->rpath_orig = p->strings + dyn[DT_RPATH]; |
Rich Felker | d8dc2b7 | 2014-11-23 16:17:57 -0500 | [diff] [blame] | 699 | if (dyn[0]&(1<<DT_RUNPATH)) |
Rich Felker | e6076c9 | 2015-09-17 19:21:55 +0000 | [diff] [blame] | 700 | p->rpath_orig = p->strings + dyn[DT_RUNPATH]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 701 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 702 | p->ghashtab = laddr(p, *dyn); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 703 | if (search_vec(p->dynv, dyn, DT_VERSYM)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 704 | p->versym = laddr(p, *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 705 | } |
| 706 | |
Rich Felker | 3958144 | 2015-09-21 21:47:50 +0000 | [diff] [blame^] | 707 | static size_t count_syms(struct dso *p) |
| 708 | { |
| 709 | if (p->hashtab) return p->hashtab[1]; |
| 710 | |
| 711 | size_t nsym, i; |
| 712 | uint32_t *buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 713 | uint32_t *hashval; |
| 714 | for (i = nsym = 0; i < p->ghashtab[0]; i++) { |
| 715 | if (buckets[i] > nsym) |
| 716 | nsym = buckets[i]; |
| 717 | } |
| 718 | if (nsym) { |
| 719 | hashval = buckets + p->ghashtab[0] + (nsym - p->ghashtab[1]); |
| 720 | do nsym++; |
| 721 | while (!(*hashval++ & 1)); |
| 722 | } |
| 723 | return nsym; |
| 724 | } |
| 725 | |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 726 | static struct dso *load_library(const char *name, struct dso *needed_by) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 727 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 728 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 729 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 730 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 731 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 732 | int fd; |
| 733 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 734 | size_t alloc_size; |
| 735 | int n_th = 0; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 736 | int is_self = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 737 | |
Rich Felker | 5954931 | 2014-07-11 00:29:44 -0400 | [diff] [blame] | 738 | if (!*name) { |
| 739 | errno = EINVAL; |
| 740 | return 0; |
| 741 | } |
| 742 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 743 | /* Catch and block attempts to reload the implementation itself */ |
| 744 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 745 | static const char *rp, reserved[] = |
| 746 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 747 | char *z = strchr(name, '.'); |
| 748 | if (z) { |
| 749 | size_t l = z-name; |
Rich Felker | 27593d3 | 2013-07-31 15:14:06 -0400 | [diff] [blame] | 750 | 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] | 751 | if (*rp) { |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 752 | if (ldd_mode) { |
| 753 | /* Track which names have been resolved |
| 754 | * and only report each one once. */ |
| 755 | static unsigned reported; |
| 756 | unsigned mask = 1U<<(rp-reserved); |
| 757 | if (!(reported & mask)) { |
| 758 | reported |= mask; |
| 759 | dprintf(1, "\t%s => %s (%p)\n", |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 760 | name, ldso.name, |
| 761 | ldso.base); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 762 | } |
| 763 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 764 | is_self = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 765 | } |
| 766 | } |
| 767 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 768 | if (!strcmp(name, ldso.name)) is_self = 1; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 769 | if (is_self) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 770 | if (!ldso.prev) { |
| 771 | tail->next = &ldso; |
| 772 | ldso.prev = tail; |
| 773 | tail = ldso.next ? ldso.next : &ldso; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 774 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 775 | return &ldso; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 776 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 777 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 778 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 779 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 780 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 781 | /* Search for the name to see if it's already loaded */ |
| 782 | for (p=head->next; p; p=p->next) { |
| 783 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 784 | p->refcnt++; |
| 785 | return p; |
| 786 | } |
| 787 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 788 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 789 | fd = -1; |
Rich Felker | 3e3753c | 2013-08-02 10:02:29 -0400 | [diff] [blame] | 790 | if (env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 791 | for (p=needed_by; fd == -1 && p; p=p->needed_by) { |
| 792 | if (fixup_rpath(p, buf, sizeof buf) < 0) |
| 793 | fd = -2; /* Inhibit further search. */ |
| 794 | if (p->rpath) |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 795 | fd = path_open(name, p->rpath, buf, sizeof buf); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 796 | } |
Rich Felker | 5d1c8c9 | 2015-04-01 20:27:29 -0400 | [diff] [blame] | 797 | if (fd == -1) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 798 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 799 | char *prefix = 0; |
| 800 | size_t prefix_len; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 801 | if (ldso.name[0]=='/') { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 802 | char *s, *t, *z; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 803 | for (s=t=z=ldso.name; *s; s++) |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 804 | if (*s=='/') z=t, t=s; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 805 | prefix_len = z-ldso.name; |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 806 | if (prefix_len < PATH_MAX) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 807 | prefix = ldso.name; |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 808 | } |
| 809 | if (!prefix) { |
| 810 | prefix = ""; |
| 811 | prefix_len = 0; |
| 812 | } |
| 813 | char etc_ldso_path[prefix_len + 1 |
| 814 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 815 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 816 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 817 | (int)prefix_len, prefix); |
| 818 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 819 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 820 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 821 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 822 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 823 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 824 | fclose(f); |
Rich Felker | ff4be70 | 2013-09-09 13:39:08 -0400 | [diff] [blame] | 825 | } else if (errno != ENOENT) { |
| 826 | sys_path = ""; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 827 | } |
| 828 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 829 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 830 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 831 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 832 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 833 | } |
| 834 | if (fd < 0) return 0; |
| 835 | if (fstat(fd, &st) < 0) { |
| 836 | close(fd); |
| 837 | return 0; |
| 838 | } |
| 839 | for (p=head->next; p; p=p->next) { |
| 840 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 841 | /* If this library was previously loaded with a |
| 842 | * pathname but a search found the same inode, |
| 843 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 844 | if (!p->shortname && pathname != name) |
| 845 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 846 | close(fd); |
| 847 | p->refcnt++; |
| 848 | return p; |
| 849 | } |
| 850 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 851 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 852 | close(fd); |
| 853 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 854 | |
| 855 | /* Allocate storage for the new DSO. When there is TLS, this |
| 856 | * storage must include a reservation for all pre-existing |
| 857 | * threads to obtain copies of both the new TLS, and an |
| 858 | * extended DTV capable of storing an additional slot for |
| 859 | * the newly-loaded DSO. */ |
| 860 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 861 | if (runtime && temp_dso.tls_image) { |
| 862 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 863 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 864 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 865 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 866 | else alloc_size += n_th * per_th; |
| 867 | } |
| 868 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 869 | if (!p) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 870 | munmap(map, temp_dso.map_len); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 871 | return 0; |
| 872 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 873 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 874 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 875 | p->dev = st.st_dev; |
| 876 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 877 | p->refcnt = 1; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 878 | p->needed_by = needed_by; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 879 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 880 | strcpy(p->name, pathname); |
| 881 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 882 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 883 | if (p->tls_image) { |
| 884 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 885 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 886 | #ifdef TLS_ABOVE_TP |
| 887 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 888 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 889 | tls_offset += p->tls_size; |
| 890 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 891 | tls_offset += p->tls_size + p->tls_align - 1; |
| 892 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 893 | & (p->tls_align-1); |
| 894 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 895 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 896 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 897 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 898 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 899 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 900 | |
| 901 | tail->next = p; |
| 902 | p->prev = tail; |
| 903 | tail = p; |
| 904 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 905 | 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] | 906 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 907 | return p; |
| 908 | } |
| 909 | |
| 910 | static void load_deps(struct dso *p) |
| 911 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 912 | size_t i, ndeps=0; |
| 913 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 914 | for (; p; p=p->next) { |
| 915 | for (i=0; p->dynv[i]; i+=2) { |
| 916 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 917 | dep = load_library(p->strings + p->dynv[i+1], p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 918 | if (!dep) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 919 | error("Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 920 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 921 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 922 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 923 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 924 | if (runtime) { |
| 925 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 926 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 927 | tmp[ndeps++] = dep; |
| 928 | tmp[ndeps] = 0; |
| 929 | *deps = tmp; |
| 930 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 931 | } |
| 932 | } |
| 933 | } |
| 934 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 935 | static void load_preload(char *s) |
| 936 | { |
| 937 | int tmp; |
| 938 | char *z; |
| 939 | for (z=s; *z; s=z) { |
Rich Felker | 349381a | 2014-07-11 00:26:12 -0400 | [diff] [blame] | 940 | for ( ; *s && (isspace(*s) || *s==':'); s++); |
| 941 | for (z=s; *z && !isspace(*z) && *z!=':'; z++); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 942 | tmp = *z; |
| 943 | *z = 0; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 944 | load_library(s, 0); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 945 | *z = tmp; |
| 946 | } |
| 947 | } |
| 948 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 949 | static void make_global(struct dso *p) |
| 950 | { |
| 951 | for (; p; p=p->next) p->global = 1; |
| 952 | } |
| 953 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 954 | static void do_mips_relocs(struct dso *p, size_t *got) |
| 955 | { |
| 956 | size_t i, j, rel[2]; |
| 957 | unsigned char *base = p->base; |
| 958 | i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO); |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 959 | if (p==&ldso) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 960 | got += i; |
| 961 | } else { |
| 962 | while (i--) *got++ += (size_t)base; |
| 963 | } |
| 964 | j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM); |
| 965 | i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO); |
| 966 | Sym *sym = p->syms + j; |
| 967 | rel[0] = (unsigned char *)got - base; |
| 968 | for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) { |
| 969 | rel[1] = sym-p->syms << 8 | R_MIPS_JUMP_SLOT; |
| 970 | do_relocs(p, rel, sizeof rel, 2); |
| 971 | } |
| 972 | } |
| 973 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 974 | static void reloc_all(struct dso *p) |
| 975 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 976 | size_t dyn[DYN_CNT]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 977 | for (; p; p=p->next) { |
| 978 | if (p->relocated) continue; |
| 979 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 980 | if (NEED_MIPS_GOT_RELOCS) |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 981 | do_mips_relocs(p, laddr(p, dyn[DT_PLTGOT])); |
| 982 | do_relocs(p, laddr(p, dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 983 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 984 | do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 985 | do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 986 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 987 | if (head != &ldso && p->relro_start != p->relro_end && |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 988 | mprotect(laddr(p, p->relro_start), p->relro_end-p->relro_start, PROT_READ) |
Rich Felker | 75eceb3 | 2015-06-17 17:21:46 +0000 | [diff] [blame] | 989 | && errno != ENOSYS) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 990 | error("Error relocating %s: RELRO protection failed: %m", |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 991 | p->name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 992 | if (runtime) longjmp(*rtld_fail, 1); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 993 | } |
| 994 | |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 995 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 996 | } |
| 997 | } |
| 998 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 999 | static void kernel_mapped_dso(struct dso *p) |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1000 | { |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1001 | size_t min_addr = -1, max_addr = 0, cnt; |
| 1002 | Phdr *ph = p->phdr; |
| 1003 | for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { |
| 1004 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1005 | p->dynv = laddr(p, ph->p_vaddr); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1006 | } else if (ph->p_type == PT_GNU_RELRO) { |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1007 | p->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 1008 | p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
| 1009 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1010 | if (ph->p_type != PT_LOAD) continue; |
| 1011 | if (ph->p_vaddr < min_addr) |
| 1012 | min_addr = ph->p_vaddr; |
| 1013 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 1014 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 1015 | } |
| 1016 | min_addr &= -PAGE_SIZE; |
| 1017 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 1018 | p->map = p->base + min_addr; |
| 1019 | p->map_len = max_addr - min_addr; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1020 | p->kernel_mapped = 1; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1021 | } |
| 1022 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1023 | static void do_fini() |
| 1024 | { |
| 1025 | struct dso *p; |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1026 | size_t dyn[DYN_CNT]; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1027 | for (p=fini_head; p; p=p->fini_next) { |
| 1028 | if (!p->constructed) continue; |
| 1029 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1030 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 1031 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1032 | size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])+n; |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 1033 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1034 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1035 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 1036 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1037 | ((void (*)(void))laddr(p, dyn[DT_FINI]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1038 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1039 | } |
| 1040 | } |
| 1041 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1042 | static void do_init_fini(struct dso *p) |
| 1043 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1044 | size_t dyn[DYN_CNT]; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1045 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1046 | /* Allow recursive calls that arise when a library calls |
| 1047 | * dlopen from one of its constructors, but block any |
| 1048 | * other threads until all ctors have finished. */ |
| 1049 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1050 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1051 | if (p->constructed) continue; |
| 1052 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1053 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1054 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1055 | p->fini_next = fini_head; |
| 1056 | fini_head = p; |
| 1057 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1058 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 1059 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1060 | ((void (*)(void))laddr(p, dyn[DT_INIT]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1061 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1062 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 1063 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1064 | size_t *fn = laddr(p, dyn[DT_INIT_ARRAY]); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1065 | while (n--) ((void (*)(void))*fn++)(); |
| 1066 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 1067 | if (!need_locking && libc.threads_minus_1) { |
| 1068 | need_locking = 1; |
| 1069 | pthread_mutex_lock(&init_fini_lock); |
| 1070 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1071 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1072 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1073 | } |
| 1074 | |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1075 | static void dl_debug_state(void) |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1076 | { |
| 1077 | } |
| 1078 | |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1079 | weak_alias(dl_debug_state, _dl_debug_state); |
| 1080 | |
Rich Felker | 7c6c290 | 2013-08-03 16:27:30 -0400 | [diff] [blame] | 1081 | void __reset_tls() |
| 1082 | { |
| 1083 | pthread_t self = __pthread_self(); |
| 1084 | struct dso *p; |
| 1085 | for (p=head; p; p=p->next) { |
| 1086 | if (!p->tls_id || !self->dtv[p->tls_id]) continue; |
| 1087 | memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len); |
| 1088 | memset((char *)self->dtv[p->tls_id]+p->tls_len, 0, |
| 1089 | p->tls_size - p->tls_len); |
| 1090 | if (p->tls_id == (size_t)self->dtv[0]) break; |
| 1091 | } |
| 1092 | } |
| 1093 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1094 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1095 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1096 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1097 | struct dso *p; |
Rich Felker | 0f66fce | 2015-04-13 18:07:10 -0400 | [diff] [blame] | 1098 | void **dtv; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1099 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1100 | #ifdef TLS_ABOVE_TP |
Rich Felker | 0f66fce | 2015-04-13 18:07:10 -0400 | [diff] [blame] | 1101 | dtv = (void **)(mem + libc.tls_size) - (tls_cnt + 1); |
| 1102 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1103 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 1104 | td = (pthread_t)mem; |
| 1105 | mem += sizeof(struct pthread); |
| 1106 | |
| 1107 | for (p=head; p; p=p->next) { |
| 1108 | if (!p->tls_id) continue; |
| 1109 | dtv[p->tls_id] = mem + p->tls_offset; |
| 1110 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 1111 | } |
| 1112 | #else |
Rich Felker | 0f66fce | 2015-04-13 18:07:10 -0400 | [diff] [blame] | 1113 | dtv = (void **)mem; |
| 1114 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1115 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1116 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1117 | td = (pthread_t)mem; |
| 1118 | |
| 1119 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1120 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1121 | dtv[p->tls_id] = mem - p->tls_offset; |
| 1122 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1123 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1124 | #endif |
Rich Felker | 0f66fce | 2015-04-13 18:07:10 -0400 | [diff] [blame] | 1125 | dtv[0] = (void *)tls_cnt; |
Szabolcs Nagy | 204a69d | 2015-03-11 12:48:12 +0000 | [diff] [blame] | 1126 | td->dtv = td->dtv_copy = dtv; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1127 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1128 | } |
| 1129 | |
Rich Felker | bc081f6 | 2015-04-14 10:42:44 -0400 | [diff] [blame] | 1130 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1131 | void *__tls_get_new(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1132 | { |
| 1133 | pthread_t self = __pthread_self(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1134 | |
| 1135 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 1136 | sigset_t set; |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1137 | __block_all_sigs(&set); |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1138 | if (v[0]<=(size_t)self->dtv[0]) { |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1139 | __restore_sigs(&set); |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 1140 | return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1141 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1142 | |
| 1143 | /* This is safe without any locks held because, if the caller |
| 1144 | * is able to request the Nth entry of the DTV, the DSO list |
| 1145 | * must be valid at least that far out and it was synchronized |
| 1146 | * at program startup or by an already-completed call to dlopen. */ |
| 1147 | struct dso *p; |
| 1148 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 1149 | |
| 1150 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1151 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1152 | void **newdtv = p->new_dtv + |
| 1153 | (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] | 1154 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1155 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 1156 | newdtv[0] = (void *)v[0]; |
Szabolcs Nagy | 204a69d | 2015-03-11 12:48:12 +0000 | [diff] [blame] | 1157 | self->dtv = self->dtv_copy = newdtv; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1158 | } |
| 1159 | |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1160 | /* Get new TLS memory from all new DSOs up to the requested one */ |
| 1161 | unsigned char *mem; |
| 1162 | for (p=head; ; p=p->next) { |
| 1163 | if (!p->tls_id || self->dtv[p->tls_id]) continue; |
| 1164 | mem = p->new_tls + (p->tls_size + p->tls_align) |
| 1165 | * a_fetch_add(&p->new_tls_idx,1); |
| 1166 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) |
| 1167 | & (p->tls_align-1); |
| 1168 | self->dtv[p->tls_id] = mem; |
| 1169 | memcpy(mem, p->tls_image, p->tls_len); |
| 1170 | if (p->tls_id == v[0]) break; |
| 1171 | } |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1172 | __restore_sigs(&set); |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 1173 | return mem + v[1] + DTP_OFFSET; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1174 | } |
| 1175 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1176 | static void update_tls_size() |
| 1177 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1178 | libc.tls_size = ALIGN( |
| 1179 | (1+tls_cnt) * sizeof(void *) + |
| 1180 | tls_offset + |
| 1181 | sizeof(struct pthread) + |
| 1182 | tls_align * 2, |
| 1183 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1184 | } |
| 1185 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1186 | /* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the |
| 1187 | * following stage 2 and stage 3 functions via primitive symbolic lookup |
| 1188 | * since it does not have access to their addresses to begin with. */ |
| 1189 | |
| 1190 | /* Stage 2 of the dynamic linker is called after relative relocations |
| 1191 | * have been processed. It can make function calls to static functions |
| 1192 | * and access string literals and static data, but cannot use extern |
| 1193 | * symbols. Its job is to perform symbolic relocations on the dynamic |
| 1194 | * linker itself, but some of the relocations performed may need to be |
| 1195 | * replaced later due to copy relocations in the main program. */ |
| 1196 | |
Rich Felker | 768b82c | 2015-05-25 19:15:17 -0400 | [diff] [blame] | 1197 | void __dls2(unsigned char *base, size_t *sp) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1198 | { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1199 | Ehdr *ehdr = (void *)base; |
| 1200 | ldso.base = base; |
| 1201 | ldso.name = ldso.shortname = "libc.so"; |
| 1202 | ldso.global = 1; |
| 1203 | ldso.phnum = ehdr->e_phnum; |
| 1204 | ldso.phdr = (void *)(base + ehdr->e_phoff); |
| 1205 | ldso.phentsize = ehdr->e_phentsize; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1206 | kernel_mapped_dso(&ldso); |
| 1207 | decode_dyn(&ldso); |
| 1208 | |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1209 | /* Prepare storage for to save clobbered REL addends so they |
| 1210 | * can be reused in stage 3. There should be very few. If |
| 1211 | * something goes wrong and there are a huge number, abort |
| 1212 | * instead of risking stack overflow. */ |
| 1213 | size_t dyn[DYN_CNT]; |
| 1214 | decode_vec(ldso.dynv, dyn, DYN_CNT); |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1215 | size_t *rel = laddr(&ldso, dyn[DT_REL]); |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1216 | size_t rel_size = dyn[DT_RELSZ]; |
| 1217 | size_t symbolic_rel_cnt = 0; |
| 1218 | apply_addends_to = rel; |
| 1219 | for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t)) |
| 1220 | if (!IS_RELATIVE(rel[1])) symbolic_rel_cnt++; |
| 1221 | if (symbolic_rel_cnt >= ADDEND_LIMIT) a_crash(); |
| 1222 | size_t addends[symbolic_rel_cnt+1]; |
| 1223 | saved_addends = addends; |
| 1224 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1225 | head = &ldso; |
| 1226 | reloc_all(&ldso); |
| 1227 | |
| 1228 | ldso.relocated = 0; |
Rich Felker | 768b82c | 2015-05-25 19:15:17 -0400 | [diff] [blame] | 1229 | |
| 1230 | /* Call dynamic linker stage-3, __dls3, looking it up |
| 1231 | * symbolically as a barrier against moving the address |
| 1232 | * load across the above relocation processing. */ |
| 1233 | struct symdef dls3_def = find_sym(&ldso, "__dls3", 0); |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1234 | ((stage3_func)laddr(&ldso, dls3_def.sym->st_value))(sp); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1235 | } |
| 1236 | |
| 1237 | /* Stage 3 of the dynamic linker is called with the dynamic linker/libc |
| 1238 | * fully functional. Its job is to load (if not already loaded) and |
| 1239 | * process dependencies and relocations for the main application and |
| 1240 | * transfer control to its entry point. */ |
| 1241 | |
| 1242 | _Noreturn void __dls3(size_t *sp) |
| 1243 | { |
| 1244 | static struct dso app, vdso; |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1245 | size_t aux[AUX_CNT], *auxv; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1246 | size_t i; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1247 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1248 | size_t vdso_base; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1249 | int argc = *sp; |
| 1250 | char **argv = (void *)(sp+1); |
| 1251 | char **argv_orig = argv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1252 | char **envp = argv+argc+1; |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1253 | |
Rich Felker | 75ce450 | 2015-06-07 20:55:23 +0000 | [diff] [blame] | 1254 | /* Find aux vector just past environ[] and use it to initialize |
| 1255 | * global data that may be needed before we can make syscalls. */ |
| 1256 | __environ = envp; |
| 1257 | for (i=argc+1; argv[i]; i++); |
| 1258 | libc.auxv = auxv = (void *)(argv+i+1); |
| 1259 | decode_vec(auxv, aux, AUX_CNT); |
| 1260 | __hwcap = aux[AT_HWCAP]; |
| 1261 | libc.page_size = aux[AT_PAGESZ]; |
| 1262 | libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
| 1263 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]); |
| 1264 | |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1265 | /* Setup early thread pointer in builtin_tls for ldso/libc itself to |
| 1266 | * use during dynamic linking. If possible it will also serve as the |
| 1267 | * thread pointer at runtime. */ |
| 1268 | libc.tls_size = sizeof builtin_tls; |
| 1269 | if (__init_tp(__copy_tls((void *)builtin_tls)) < 0) { |
Rich Felker | 19a1fe6 | 2015-04-13 19:24:51 -0400 | [diff] [blame] | 1270 | a_crash(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1271 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1272 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1273 | /* Only trust user/env if kernel says we're not suid/sgid */ |
Rich Felker | 75ce450 | 2015-06-07 20:55:23 +0000 | [diff] [blame] | 1274 | if (!libc.secure) { |
| 1275 | env_path = getenv("LD_LIBRARY_PATH"); |
| 1276 | env_preload = getenv("LD_PRELOAD"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1277 | } |
| 1278 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1279 | /* If the main program was already loaded by the kernel, |
| 1280 | * AT_PHDR will point to some location other than the dynamic |
| 1281 | * linker's program headers. */ |
| 1282 | if (aux[AT_PHDR] != (size_t)ldso.phdr) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1283 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1284 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1285 | /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */ |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1286 | Phdr *phdr = app.phdr = (void *)aux[AT_PHDR]; |
| 1287 | app.phnum = aux[AT_PHNUM]; |
| 1288 | app.phentsize = aux[AT_PHENT]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1289 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 1290 | if (phdr->p_type == PT_PHDR) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1291 | app.base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1292 | else if (phdr->p_type == PT_INTERP) |
| 1293 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1294 | else if (phdr->p_type == PT_TLS) { |
| 1295 | tls_image = phdr->p_vaddr; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1296 | app.tls_len = phdr->p_filesz; |
| 1297 | app.tls_size = phdr->p_memsz; |
| 1298 | app.tls_align = phdr->p_align; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1299 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1300 | } |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1301 | if (app.tls_size) app.tls_image = laddr(&app, tls_image); |
| 1302 | if (interp_off) ldso.name = laddr(&app, interp_off); |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1303 | if ((aux[0] & (1UL<<AT_EXECFN)) |
| 1304 | && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1305 | app.name = (char *)aux[AT_EXECFN]; |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1306 | else |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1307 | app.name = argv[0]; |
| 1308 | kernel_mapped_dso(&app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1309 | } else { |
| 1310 | int fd; |
| 1311 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 1312 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1313 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1314 | argv++; |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1315 | while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') { |
| 1316 | char *opt = argv[0]+2; |
| 1317 | *argv++ = (void *)-1; |
| 1318 | if (!*opt) { |
| 1319 | break; |
| 1320 | } else if (!memcmp(opt, "list", 5)) { |
| 1321 | ldd_mode = 1; |
| 1322 | } else if (!memcmp(opt, "library-path", 12)) { |
| 1323 | if (opt[12]=='=') env_path = opt+13; |
| 1324 | else if (opt[12]) *argv = 0; |
| 1325 | else if (*argv) env_path = *argv++; |
| 1326 | } else if (!memcmp(opt, "preload", 7)) { |
| 1327 | if (opt[7]=='=') env_preload = opt+8; |
| 1328 | else if (opt[7]) *argv = 0; |
| 1329 | else if (*argv) env_preload = *argv++; |
| 1330 | } else { |
| 1331 | argv[0] = 0; |
| 1332 | } |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1333 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1334 | argv[-1] = (void *)(argc - (argv-argv_orig)); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1335 | if (!argv[0]) { |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1336 | dprintf(2, "musl libc\n" |
| 1337 | "Version %s\n" |
| 1338 | "Dynamic Program Loader\n" |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1339 | "Usage: %s [options] [--] pathname%s\n", |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1340 | __libc_get_version(), ldname, |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1341 | ldd_mode ? "" : " [args]"); |
| 1342 | _exit(1); |
| 1343 | } |
| 1344 | fd = open(argv[0], O_RDONLY); |
| 1345 | if (fd < 0) { |
| 1346 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 1347 | _exit(1); |
| 1348 | } |
| 1349 | runtime = 1; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1350 | Ehdr *ehdr = (void *)map_library(fd, &app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1351 | if (!ehdr) { |
| 1352 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 1353 | _exit(1); |
| 1354 | } |
| 1355 | runtime = 0; |
| 1356 | close(fd); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1357 | ldso.name = ldname; |
| 1358 | app.name = argv[0]; |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1359 | aux[AT_ENTRY] = (size_t)laddr(&app, ehdr->e_entry); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1360 | /* Find the name that would have been used for the dynamic |
| 1361 | * linker had ldd not taken its place. */ |
| 1362 | if (ldd_mode) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1363 | for (i=0; i<app.phnum; i++) { |
| 1364 | if (app.phdr[i].p_type == PT_INTERP) |
| 1365 | ldso.name = (void *)(app.base |
| 1366 | + app.phdr[i].p_vaddr); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1367 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1368 | dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1369 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 1370 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1371 | if (app.tls_size) { |
| 1372 | app.tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1373 | #ifdef TLS_ABOVE_TP |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1374 | app.tls_offset = 0; |
| 1375 | tls_offset = app.tls_size |
| 1376 | + ( -((uintptr_t)app.tls_image + app.tls_size) |
| 1377 | & (app.tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1378 | #else |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1379 | tls_offset = app.tls_offset = app.tls_size |
| 1380 | + ( -((uintptr_t)app.tls_image + app.tls_size) |
| 1381 | & (app.tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1382 | #endif |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1383 | tls_align = MAXP2(tls_align, app.tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1384 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1385 | app.global = 1; |
| 1386 | decode_dyn(&app); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1387 | |
| 1388 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1389 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1390 | Ehdr *ehdr = (void *)vdso_base; |
| 1391 | Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 1392 | vdso.phnum = ehdr->e_phnum; |
| 1393 | vdso.phentsize = ehdr->e_phentsize; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1394 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 1395 | if (phdr->p_type == PT_DYNAMIC) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1396 | vdso.dynv = (void *)(vdso_base + phdr->p_offset); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1397 | if (phdr->p_type == PT_LOAD) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1398 | vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1399 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1400 | vdso.name = ""; |
| 1401 | vdso.shortname = "linux-gate.so.1"; |
| 1402 | vdso.global = 1; |
| 1403 | vdso.relocated = 1; |
| 1404 | decode_dyn(&vdso); |
| 1405 | vdso.prev = &ldso; |
| 1406 | ldso.next = &vdso; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1407 | } |
| 1408 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1409 | /* Initial dso chain consists only of the app. */ |
| 1410 | head = tail = &app; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1411 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1412 | /* Donate unused parts of app and library mapping to malloc */ |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1413 | reclaim_gaps(&app); |
| 1414 | reclaim_gaps(&ldso); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1415 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1416 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1417 | * namespace, and perform all remaining relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1418 | if (env_preload) load_preload(env_preload); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1419 | load_deps(&app); |
| 1420 | make_global(&app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1421 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1422 | #ifndef DYNAMIC_IS_RO |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1423 | for (i=0; app.dynv[i]; i+=2) |
| 1424 | if (app.dynv[i]==DT_DEBUG) |
| 1425 | app.dynv[i+1] = (size_t)&debug; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1426 | #endif |
| 1427 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1428 | /* The main program must be relocated LAST since it may contin |
| 1429 | * copy relocations which depend on libraries' relocations. */ |
| 1430 | reloc_all(app.next); |
| 1431 | reloc_all(&app); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1432 | |
| 1433 | update_tls_size(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1434 | if (libc.tls_size > sizeof builtin_tls || tls_align > MIN_TLS_ALIGN) { |
| 1435 | void *initial_tls = calloc(libc.tls_size, 1); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1436 | if (!initial_tls) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1437 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1438 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1439 | _exit(127); |
| 1440 | } |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1441 | if (__init_tp(__copy_tls(initial_tls)) < 0) { |
Rich Felker | 19a1fe6 | 2015-04-13 19:24:51 -0400 | [diff] [blame] | 1442 | a_crash(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1443 | } |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1444 | } else { |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1445 | size_t tmp_tls_size = libc.tls_size; |
| 1446 | pthread_t self = __pthread_self(); |
| 1447 | /* Temporarily set the tls size to the full size of |
| 1448 | * builtin_tls so that __copy_tls will use the same layout |
| 1449 | * as it did for before. Then check, just to be safe. */ |
| 1450 | libc.tls_size = sizeof builtin_tls; |
| 1451 | if (__copy_tls((void*)builtin_tls) != self) a_crash(); |
| 1452 | libc.tls_size = tmp_tls_size; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1453 | } |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1454 | static_tls_cnt = tls_cnt; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1455 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1456 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1457 | if (ldd_mode) _exit(0); |
| 1458 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1459 | /* Switch to runtime mode: any further failures in the dynamic |
| 1460 | * linker are a reportable failure rather than a fatal startup |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1461 | * error. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1462 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1463 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1464 | debug.ver = 1; |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1465 | debug.bp = dl_debug_state; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1466 | debug.head = head; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1467 | debug.base = ldso.base; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1468 | debug.state = 0; |
| 1469 | _dl_debug_state(); |
| 1470 | |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1471 | __init_libc(envp, argv[0]); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1472 | atexit(do_fini); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1473 | errno = 0; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1474 | do_init_fini(tail); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1475 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1476 | CRTJMP((void *)aux[AT_ENTRY], argv-1); |
| 1477 | for(;;); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1478 | } |
| 1479 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1480 | void *dlopen(const char *file, int mode) |
| 1481 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1482 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1483 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1484 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1485 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1486 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1487 | |
| 1488 | if (!file) return head; |
| 1489 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1490 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1491 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1492 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1493 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1494 | p = 0; |
| 1495 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1496 | orig_tls_offset = tls_offset; |
| 1497 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1498 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1499 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1500 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1501 | rtld_fail = &jb; |
| 1502 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1503 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1504 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1505 | if (p->deps[i]->global < 0) |
| 1506 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1507 | for (p=orig_tail->next; p; p=next) { |
| 1508 | next = p->next; |
| 1509 | munmap(p->map, p->map_len); |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1510 | while (p->td_index) { |
| 1511 | void *tmp = p->td_index->next; |
| 1512 | free(p->td_index); |
| 1513 | p->td_index = tmp; |
| 1514 | } |
Rich Felker | 0770962 | 2015-04-04 00:15:19 -0400 | [diff] [blame] | 1515 | if (p->rpath != p->rpath_orig) |
| 1516 | free(p->rpath); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1517 | free(p->deps); |
| 1518 | free(p); |
| 1519 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1520 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1521 | tls_offset = orig_tls_offset; |
| 1522 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1523 | tail = orig_tail; |
| 1524 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1525 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1526 | goto end; |
Rich Felker | 0f9b1f6 | 2013-08-23 23:13:25 -0400 | [diff] [blame] | 1527 | } else p = load_library(file, head); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1528 | |
| 1529 | if (!p) { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1530 | error(noload ? |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1531 | "Library %s is not already loaded" : |
| 1532 | "Error loading shared library %s: %m", |
| 1533 | file); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1534 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1535 | } |
| 1536 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1537 | /* First load handling */ |
| 1538 | if (!p->deps) { |
| 1539 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1540 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1541 | if (!p->deps[i]->global) |
| 1542 | p->deps[i]->global = -1; |
| 1543 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1544 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1545 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1546 | if (p->deps[i]->global < 0) |
| 1547 | p->deps[i]->global = 0; |
| 1548 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1549 | } |
| 1550 | |
| 1551 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1552 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1553 | p->deps[i]->global = 1; |
| 1554 | p->global = 1; |
| 1555 | } |
| 1556 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1557 | update_tls_size(); |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1558 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1559 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1560 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1561 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1562 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1563 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1564 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1565 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1566 | return p; |
| 1567 | } |
| 1568 | |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1569 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1570 | { |
| 1571 | struct dso *p; |
| 1572 | for (p=head; p; p=p->next) if (h==p) return 0; |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1573 | error("Invalid library handle %p", (void *)h); |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1574 | return 1; |
| 1575 | } |
| 1576 | |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1577 | void *__tls_get_addr(size_t *); |
| 1578 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1579 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1580 | { |
| 1581 | size_t i; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1582 | uint32_t h = 0, gh = 0, *ght; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1583 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1584 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1585 | if (p == RTLD_DEFAULT) { |
| 1586 | p = head; |
| 1587 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1588 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1589 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1590 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1591 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1592 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1593 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1594 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1595 | return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value}); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1596 | return laddr(def.dso, def.sym->st_value); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1597 | } |
Rich Felker | 97b72d2 | 2015-04-21 13:07:06 -0400 | [diff] [blame] | 1598 | if (invalid_dso_handle(p)) |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1599 | return 0; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1600 | if ((ght = p->ghashtab)) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1601 | gh = gnu_hash(s); |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1602 | sym = gnu_lookup(gh, ght, p, s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1603 | } else { |
| 1604 | h = sysv_hash(s); |
| 1605 | sym = sysv_lookup(s, h, p); |
| 1606 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1607 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1608 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1609 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1610 | return laddr(p, sym->st_value); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1611 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1612 | if ((ght = p->deps[i]->ghashtab)) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1613 | if (!gh) gh = gnu_hash(s); |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1614 | sym = gnu_lookup(gh, ght, p->deps[i], s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1615 | } else { |
| 1616 | if (!h) h = sysv_hash(s); |
| 1617 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1618 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1619 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1620 | 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] | 1621 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1622 | return laddr(p->deps[i], sym->st_value); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1623 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1624 | failed: |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1625 | error("Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1626 | return 0; |
| 1627 | } |
| 1628 | |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1629 | int __dladdr(const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1630 | { |
| 1631 | struct dso *p; |
| 1632 | Sym *sym; |
| 1633 | uint32_t nsym; |
| 1634 | char *strings; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1635 | void *best = 0; |
| 1636 | char *bestname; |
| 1637 | |
| 1638 | pthread_rwlock_rdlock(&lock); |
| 1639 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1640 | pthread_rwlock_unlock(&lock); |
| 1641 | |
| 1642 | if (!p) return 0; |
| 1643 | |
| 1644 | sym = p->syms; |
| 1645 | strings = p->strings; |
Rich Felker | 3958144 | 2015-09-21 21:47:50 +0000 | [diff] [blame^] | 1646 | nsym = count_syms(p); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1647 | |
| 1648 | for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1649 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1650 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1651 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1652 | void *symaddr = laddr(p, sym->st_value); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1653 | if (symaddr > addr || symaddr < best) |
| 1654 | continue; |
| 1655 | best = symaddr; |
| 1656 | bestname = strings + sym->st_name; |
| 1657 | if (addr == symaddr) |
| 1658 | break; |
| 1659 | } |
| 1660 | } |
| 1661 | |
| 1662 | if (!best) return 0; |
| 1663 | |
| 1664 | info->dli_fname = p->name; |
| 1665 | info->dli_fbase = p->base; |
| 1666 | info->dli_sname = bestname; |
| 1667 | info->dli_saddr = best; |
| 1668 | |
| 1669 | return 1; |
| 1670 | } |
| 1671 | |
Rich Felker | 72b25dd | 2015-04-14 11:39:11 -0400 | [diff] [blame] | 1672 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1673 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1674 | { |
| 1675 | void *res; |
| 1676 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1677 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1678 | pthread_rwlock_unlock(&lock); |
| 1679 | return res; |
| 1680 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1681 | |
| 1682 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1683 | { |
| 1684 | struct dso *current; |
| 1685 | struct dl_phdr_info info; |
| 1686 | int ret = 0; |
| 1687 | for(current = head; current;) { |
| 1688 | info.dlpi_addr = (uintptr_t)current->base; |
| 1689 | info.dlpi_name = current->name; |
| 1690 | info.dlpi_phdr = current->phdr; |
| 1691 | info.dlpi_phnum = current->phnum; |
| 1692 | info.dlpi_adds = gencnt; |
| 1693 | info.dlpi_subs = 0; |
| 1694 | info.dlpi_tls_modid = current->tls_id; |
| 1695 | info.dlpi_tls_data = current->tls_image; |
| 1696 | |
| 1697 | ret = (callback)(&info, sizeof (info), data); |
| 1698 | |
| 1699 | if (ret != 0) break; |
| 1700 | |
| 1701 | pthread_rwlock_rdlock(&lock); |
| 1702 | current = current->next; |
| 1703 | pthread_rwlock_unlock(&lock); |
| 1704 | } |
| 1705 | return ret; |
| 1706 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1707 | #else |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1708 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1709 | { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1710 | error("Invalid library handle %p", (void *)h); |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1711 | return 1; |
| 1712 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1713 | void *dlopen(const char *file, int mode) |
| 1714 | { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1715 | error("Dynamic loading not supported"); |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1716 | return 0; |
| 1717 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1718 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1719 | { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1720 | error("Symbol not found: %s", s); |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1721 | return 0; |
| 1722 | } |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1723 | int __dladdr (const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1724 | { |
| 1725 | return 0; |
| 1726 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1727 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1728 | |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1729 | int __dlinfo(void *dso, int req, void *res) |
| 1730 | { |
| 1731 | if (invalid_dso_handle(dso)) return -1; |
| 1732 | if (req != RTLD_DI_LINKMAP) { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1733 | error("Unsupported request %d", req); |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1734 | return -1; |
| 1735 | } |
| 1736 | *(struct link_map **)res = dso; |
| 1737 | return 0; |
| 1738 | } |
| 1739 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1740 | char *dlerror() |
| 1741 | { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1742 | pthread_t self = __pthread_self(); |
| 1743 | if (!self->dlerror_flag) return 0; |
| 1744 | self->dlerror_flag = 0; |
| 1745 | char *s = self->dlerror_buf; |
| 1746 | if (s == (void *)-1) |
| 1747 | return "Dynamic linker failed to allocate memory for error message"; |
| 1748 | else |
| 1749 | return s; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1750 | } |
| 1751 | |
| 1752 | int dlclose(void *p) |
| 1753 | { |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1754 | return invalid_dso_handle(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1755 | } |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1756 | |
| 1757 | void __dl_thread_cleanup(void) |
| 1758 | { |
| 1759 | pthread_t self = __pthread_self(); |
| 1760 | if (self->dlerror_buf != (void *)-1) |
| 1761 | free(self->dlerror_buf); |
| 1762 | } |
| 1763 | |
| 1764 | static void error(const char *fmt, ...) |
| 1765 | { |
| 1766 | va_list ap; |
| 1767 | va_start(ap, fmt); |
| 1768 | #ifdef SHARED |
| 1769 | if (!runtime) { |
| 1770 | vdprintf(2, fmt, ap); |
| 1771 | dprintf(2, "\n"); |
| 1772 | ldso_fail = 1; |
| 1773 | va_end(ap); |
| 1774 | return; |
| 1775 | } |
| 1776 | #endif |
| 1777 | pthread_t self = __pthread_self(); |
| 1778 | if (self->dlerror_buf != (void *)-1) |
| 1779 | free(self->dlerror_buf); |
| 1780 | size_t len = vsnprintf(0, 0, fmt, ap); |
| 1781 | va_end(ap); |
| 1782 | char *buf = malloc(len+1); |
| 1783 | if (buf) { |
| 1784 | va_start(ap, fmt); |
| 1785 | vsnprintf(buf, len+1, fmt, ap); |
| 1786 | va_end(ap); |
| 1787 | } else { |
| 1788 | buf = (void *)-1; |
| 1789 | } |
| 1790 | self->dlerror_buf = buf; |
| 1791 | self->dlerror_flag = 1; |
| 1792 | } |