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 | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 26 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 27 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 28 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 29 | struct debug { |
| 30 | int ver; |
| 31 | void *head; |
| 32 | void (*bp)(void); |
| 33 | int state; |
| 34 | void *base; |
| 35 | }; |
| 36 | |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 37 | struct td_index { |
| 38 | size_t args[2]; |
| 39 | struct td_index *next; |
| 40 | }; |
| 41 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 42 | struct dso { |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 43 | #if DL_FDPIC |
| 44 | struct fdpic_loadmap *loadmap; |
| 45 | #else |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 46 | unsigned char *base; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 47 | #endif |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 48 | char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 49 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 50 | struct dso *next, *prev; |
| 51 | |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 52 | Phdr *phdr; |
| 53 | int phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 54 | size_t phentsize; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 55 | Sym *syms; |
Rich Felker | b418ea1 | 2016-11-11 12:30:24 -0500 | [diff] [blame] | 56 | Elf_Symndx *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 57 | uint32_t *ghashtab; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 58 | int16_t *versym; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 59 | char *strings; |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 60 | struct dso *syms_next, *lazy_next; |
| 61 | size_t *lazy, lazy_cnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 62 | unsigned char *map; |
| 63 | size_t map_len; |
| 64 | dev_t dev; |
| 65 | ino_t ino; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 66 | char relocated; |
| 67 | char constructed; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 68 | char kernel_mapped; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 69 | struct dso **deps, *needed_by; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 70 | char *rpath_orig, *rpath; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 71 | struct tls_module tls; |
| 72 | size_t tls_id; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 73 | size_t relro_start, relro_end; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 74 | void **new_dtv; |
| 75 | unsigned char *new_tls; |
Rich Felker | 56fbaa3 | 2015-03-03 22:50:02 -0500 | [diff] [blame] | 76 | volatile int new_dtv_idx, new_tls_idx; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 77 | struct td_index *td_index; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 78 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 79 | char *shortname; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 80 | #if DL_FDPIC |
| 81 | unsigned char *base; |
| 82 | #else |
| 83 | struct fdpic_loadmap *loadmap; |
| 84 | #endif |
| 85 | struct funcdesc { |
| 86 | void *addr; |
| 87 | size_t *got; |
| 88 | } *funcdescs; |
| 89 | size_t *got; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 90 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 91 | }; |
| 92 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 93 | struct symdef { |
| 94 | Sym *sym; |
| 95 | struct dso *dso; |
| 96 | }; |
| 97 | |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 98 | int __init_tp(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 99 | void __init_libc(char **, char *); |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 100 | void *__copy_tls(unsigned char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 101 | |
Rich Felker | 9e0a317 | 2015-11-12 16:13:52 -0500 | [diff] [blame] | 102 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 103 | const char *__libc_get_version(void); |
| 104 | |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame] | 105 | static struct builtin_tls { |
| 106 | char c; |
| 107 | struct pthread pt; |
| 108 | void *space[16]; |
| 109 | } builtin_tls[1]; |
| 110 | #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt) |
| 111 | |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 112 | #define ADDEND_LIMIT 4096 |
| 113 | static size_t *saved_addends, *apply_addends_to; |
| 114 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 115 | static struct dso ldso; |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 116 | static struct dso *head, *tail, *fini_head, *syms_tail, *lazy_head; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 117 | static char *env_path, *sys_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 118 | static unsigned long long gencnt; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 119 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 120 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 121 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 122 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 123 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 124 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 125 | static struct debug debug; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 126 | static struct tls_module *tls_tail; |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame] | 127 | static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 128 | static size_t static_tls_cnt; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 129 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 130 | static struct fdpic_loadmap *app_loadmap; |
| 131 | static struct fdpic_dummy_loadmap app_dummy_loadmap; |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 132 | static struct dso *const nodeps_dummy; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 133 | |
| 134 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 135 | |
Rich Felker | 19caa25 | 2015-11-19 20:28:08 -0500 | [diff] [blame] | 136 | __attribute__((__visibility__("hidden"))) |
| 137 | void (*const __init_array_start)(void)=0, (*const __fini_array_start)(void)=0; |
| 138 | |
| 139 | __attribute__((__visibility__("hidden"))) |
| 140 | extern void (*const __init_array_end)(void), (*const __fini_array_end)(void); |
| 141 | |
| 142 | weak_alias(__init_array_start, __init_array_end); |
| 143 | weak_alias(__fini_array_start, __fini_array_end); |
| 144 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 145 | static int dl_strcmp(const char *l, const char *r) |
| 146 | { |
| 147 | for (; *l==*r && *l; l++, r++); |
| 148 | return *(unsigned char *)l - *(unsigned char *)r; |
| 149 | } |
| 150 | #define strcmp(l,r) dl_strcmp(l,r) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 151 | |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 152 | /* Compute load address for a virtual address in a given dso. */ |
Rich Felker | 78f4302 | 2015-09-22 20:20:39 +0000 | [diff] [blame] | 153 | #if DL_FDPIC |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 154 | static void *laddr(const struct dso *p, size_t v) |
| 155 | { |
| 156 | size_t j=0; |
| 157 | if (!p->loadmap) return p->base + v; |
| 158 | for (j=0; v-p->loadmap->segs[j].p_vaddr >= p->loadmap->segs[j].p_memsz; j++); |
| 159 | return (void *)(v - p->loadmap->segs[j].p_vaddr + p->loadmap->segs[j].addr); |
| 160 | } |
| 161 | #define fpaddr(p, v) ((void (*)())&(struct funcdesc){ \ |
| 162 | laddr(p, v), (p)->got }) |
| 163 | #else |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 164 | #define laddr(p, v) (void *)((p)->base + (v)) |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 165 | #define fpaddr(p, v) ((void (*)())laddr(p, v)) |
| 166 | #endif |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 167 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 168 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 169 | { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 170 | size_t i; |
| 171 | for (i=0; i<cnt; i++) a[i] = 0; |
| 172 | for (; v[0]; v+=2) if (v[0]-1<cnt-1) { |
| 173 | a[0] |= 1UL<<v[0]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 174 | a[v[0]] = v[1]; |
| 175 | } |
| 176 | } |
| 177 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 178 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 179 | { |
| 180 | for (; v[0]!=key; v+=2) |
| 181 | if (!v[0]) return 0; |
| 182 | *r = v[1]; |
| 183 | return 1; |
| 184 | } |
| 185 | |
| 186 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 187 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 188 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 189 | uint_fast32_t h = 0; |
| 190 | while (*s) { |
| 191 | h = 16*h + *s++; |
| 192 | h ^= h>>24 & 0xf0; |
| 193 | } |
| 194 | return h & 0xfffffff; |
| 195 | } |
| 196 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 197 | static uint32_t gnu_hash(const char *s0) |
| 198 | { |
| 199 | const unsigned char *s = (void *)s0; |
| 200 | uint_fast32_t h = 5381; |
| 201 | for (; *s; s++) |
Alexander Monakov | 66d4578 | 2015-06-28 02:48:30 +0300 | [diff] [blame] | 202 | h += h*32 + *s; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 203 | return h; |
| 204 | } |
| 205 | |
| 206 | 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] | 207 | { |
| 208 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 209 | Sym *syms = dso->syms; |
Rich Felker | b418ea1 | 2016-11-11 12:30:24 -0500 | [diff] [blame] | 210 | Elf_Symndx *hashtab = dso->hashtab; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 211 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 212 | 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] | 213 | if ((!dso->versym || dso->versym[i] >= 0) |
| 214 | && (!strcmp(s, strings+syms[i].st_name))) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 215 | return syms+i; |
| 216 | } |
| 217 | return 0; |
| 218 | } |
| 219 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 220 | 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] | 221 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 222 | uint32_t nbuckets = hashtab[0]; |
| 223 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 224 | uint32_t i = buckets[h1 % nbuckets]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 225 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 226 | if (!i) return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 227 | |
Alexander Monakov | 5b4286e | 2015-06-28 02:48:32 +0300 | [diff] [blame] | 228 | uint32_t *hashval = buckets + nbuckets + (i - hashtab[1]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 229 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 230 | for (h1 |= 1; ; i++) { |
Alexander Monakov | 5b4286e | 2015-06-28 02:48:32 +0300 | [diff] [blame] | 231 | uint32_t h2 = *hashval++; |
| 232 | if ((h1 == (h2|1)) && (!dso->versym || dso->versym[i] >= 0) |
| 233 | && !strcmp(s, dso->strings + dso->syms[i].st_name)) |
| 234 | return dso->syms+i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 235 | if (h2 & 1) break; |
| 236 | } |
| 237 | |
| 238 | return 0; |
| 239 | } |
| 240 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 241 | 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] | 242 | { |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 243 | const size_t *bloomwords = (const void *)(hashtab+4); |
| 244 | size_t f = bloomwords[fofs & (hashtab[2]-1)]; |
| 245 | if (!(f & fmask)) return 0; |
| 246 | |
| 247 | f >>= (h1 >> hashtab[3]) % (8 * sizeof f); |
| 248 | if (!(f & 1)) return 0; |
| 249 | |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 250 | return gnu_lookup(h1, hashtab, dso, s); |
Alexander Monakov | 84389c6 | 2015-06-28 02:48:31 +0300 | [diff] [blame] | 251 | } |
| 252 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 253 | #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] | 254 | #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] | 255 | |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 256 | #ifndef ARCH_SYM_REJECT_UND |
| 257 | #define ARCH_SYM_REJECT_UND(s) 0 |
| 258 | #endif |
| 259 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 260 | 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] | 261 | { |
Rich Felker | a393d5c | 2017-03-15 16:50:19 -0400 | [diff] [blame] | 262 | uint32_t h = 0, gh = gnu_hash(s), gho = gh / (8*sizeof(size_t)), *ght; |
| 263 | size_t ghm = 1ul << gh % (8*sizeof(size_t)); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 264 | struct symdef def = {0}; |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 265 | for (; dso; dso=dso->syms_next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 266 | Sym *sym; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 267 | if ((ght = dso->ghashtab)) { |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 268 | sym = gnu_lookup_filtered(gh, ght, dso, s, gho, ghm); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 269 | } else { |
| 270 | if (!h) h = sysv_hash(s); |
| 271 | sym = sysv_lookup(s, h, dso); |
| 272 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 273 | if (!sym) continue; |
| 274 | if (!sym->st_shndx) |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 275 | if (need_def || (sym->st_info&0xf) == STT_TLS |
| 276 | || ARCH_SYM_REJECT_UND(sym)) |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 277 | continue; |
| 278 | if (!sym->st_value) |
| 279 | if ((sym->st_info&0xf) != STT_TLS) |
| 280 | continue; |
| 281 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 282 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 283 | def.sym = sym; |
| 284 | def.dso = dso; |
Szabolcs Nagy | c9783e4 | 2016-12-03 20:52:43 +0000 | [diff] [blame] | 285 | break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 286 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 287 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 288 | } |
| 289 | |
Rich Felker | 1b1cafa | 2015-04-17 23:29:45 -0400 | [diff] [blame] | 290 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 291 | ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic(); |
| 292 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 293 | 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] | 294 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 295 | unsigned char *base = dso->base; |
| 296 | Sym *syms = dso->syms; |
| 297 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 298 | Sym *sym; |
| 299 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 300 | void *ctx; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 301 | int type; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 302 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 303 | struct symdef def; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 304 | size_t *reloc_addr; |
| 305 | size_t sym_val; |
| 306 | size_t tls_val; |
| 307 | size_t addend; |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 308 | int skip_relative = 0, reuse_addends = 0, save_slot = 0; |
| 309 | |
| 310 | if (dso == &ldso) { |
| 311 | /* Only ldso's REL table needs addend saving/reuse. */ |
| 312 | if (rel == apply_addends_to) |
| 313 | reuse_addends = 1; |
| 314 | skip_relative = 1; |
| 315 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 316 | |
| 317 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 318 | if (skip_relative && IS_RELATIVE(rel[1], dso->syms)) continue; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 319 | type = R_TYPE(rel[1]); |
Rich Felker | b6a6cd7 | 2015-06-04 11:45:17 -0400 | [diff] [blame] | 320 | if (type == REL_NONE) continue; |
Rich Felker | a735f53 | 2015-09-17 17:50:43 +0000 | [diff] [blame] | 321 | reloc_addr = laddr(dso, rel[0]); |
Rich Felker | 4823b13 | 2017-03-13 00:30:26 -0400 | [diff] [blame] | 322 | |
| 323 | if (stride > 2) { |
| 324 | addend = rel[2]; |
| 325 | } else if (type==REL_GOT || type==REL_PLT|| type==REL_COPY) { |
| 326 | addend = 0; |
| 327 | } else if (reuse_addends) { |
| 328 | /* Save original addend in stage 2 where the dso |
| 329 | * chain consists of just ldso; otherwise read back |
| 330 | * saved addend since the inline one was clobbered. */ |
| 331 | if (head==&ldso) |
| 332 | saved_addends[save_slot] = *reloc_addr; |
| 333 | addend = saved_addends[save_slot++]; |
| 334 | } else { |
| 335 | addend = *reloc_addr; |
| 336 | } |
| 337 | |
| 338 | sym_index = R_SYM(rel[1]); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 339 | if (sym_index) { |
| 340 | sym = syms + sym_index; |
| 341 | name = strings + sym->st_name; |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 342 | ctx = type==REL_COPY ? head->syms_next : head; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 343 | def = (sym->st_info&0xf) == STT_SECTION |
| 344 | ? (struct symdef){ .dso = dso, .sym = sym } |
| 345 | : find_sym(ctx, name, type==REL_PLT); |
Rich Felker | 69003e0 | 2014-01-21 00:36:35 -0500 | [diff] [blame] | 346 | if (!def.sym && (sym->st_shndx != SHN_UNDEF |
| 347 | || sym->st_info>>4 != STB_WEAK)) { |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 348 | if (dso->lazy && (type==REL_PLT || type==REL_GOT)) { |
| 349 | dso->lazy[3*dso->lazy_cnt+0] = rel[0]; |
| 350 | dso->lazy[3*dso->lazy_cnt+1] = rel[1]; |
| 351 | dso->lazy[3*dso->lazy_cnt+2] = addend; |
| 352 | dso->lazy_cnt++; |
| 353 | continue; |
| 354 | } |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 355 | error("Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 356 | dso->name, name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 357 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 358 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 359 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 360 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 361 | sym = 0; |
| 362 | def.sym = 0; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 363 | def.dso = dso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 364 | } |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 365 | |
Rich Felker | a735f53 | 2015-09-17 17:50:43 +0000 | [diff] [blame] | 366 | 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] | 367 | tls_val = def.sym ? def.sym->st_value : 0; |
| 368 | |
| 369 | switch(type) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 370 | case REL_NONE: |
| 371 | break; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 372 | case REL_OFFSET: |
| 373 | addend -= (size_t)reloc_addr; |
| 374 | case REL_SYMBOLIC: |
| 375 | case REL_GOT: |
| 376 | case REL_PLT: |
| 377 | *reloc_addr = sym_val + addend; |
| 378 | break; |
| 379 | case REL_RELATIVE: |
| 380 | *reloc_addr = (size_t)base + addend; |
| 381 | break; |
| 382 | case REL_SYM_OR_REL: |
| 383 | if (sym) *reloc_addr = sym_val + addend; |
| 384 | else *reloc_addr = (size_t)base + addend; |
| 385 | break; |
| 386 | case REL_COPY: |
| 387 | memcpy(reloc_addr, (void *)sym_val, sym->st_size); |
| 388 | break; |
| 389 | case REL_OFFSET32: |
| 390 | *(uint32_t *)reloc_addr = sym_val + addend |
| 391 | - (size_t)reloc_addr; |
| 392 | break; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 393 | case REL_FUNCDESC: |
| 394 | *reloc_addr = def.sym ? (size_t)(def.dso->funcdescs |
| 395 | + (def.sym - def.dso->syms)) : 0; |
| 396 | break; |
| 397 | case REL_FUNCDESC_VAL: |
| 398 | if ((sym->st_info&0xf) == STT_SECTION) *reloc_addr += sym_val; |
| 399 | else *reloc_addr = sym_val; |
| 400 | reloc_addr[1] = def.sym ? (size_t)def.dso->got : 0; |
| 401 | break; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 402 | case REL_DTPMOD: |
| 403 | *reloc_addr = def.dso->tls_id; |
| 404 | break; |
| 405 | case REL_DTPOFF: |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 406 | *reloc_addr = tls_val + addend - DTP_OFFSET; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 407 | break; |
| 408 | #ifdef TLS_ABOVE_TP |
| 409 | case REL_TPOFF: |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 410 | *reloc_addr = tls_val + def.dso->tls.offset + TPOFF_K + addend; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 411 | break; |
| 412 | #else |
| 413 | case REL_TPOFF: |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 414 | *reloc_addr = tls_val - def.dso->tls.offset + addend; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 415 | break; |
| 416 | case REL_TPOFF_NEG: |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 417 | *reloc_addr = def.dso->tls.offset - tls_val + addend; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 418 | break; |
| 419 | #endif |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 420 | case REL_TLSDESC: |
| 421 | if (stride<3) addend = reloc_addr[1]; |
| 422 | if (runtime && def.dso->tls_id >= static_tls_cnt) { |
| 423 | struct td_index *new = malloc(sizeof *new); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 424 | if (!new) { |
| 425 | error( |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 426 | "Error relocating %s: cannot allocate TLSDESC for %s", |
| 427 | dso->name, sym ? name : "(local)" ); |
Rich Felker | c5ab5bd | 2015-04-21 13:22:48 -0400 | [diff] [blame] | 428 | longjmp(*rtld_fail, 1); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 429 | } |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 430 | new->next = dso->td_index; |
| 431 | dso->td_index = new; |
| 432 | new->args[0] = def.dso->tls_id; |
| 433 | new->args[1] = tls_val + addend; |
| 434 | reloc_addr[0] = (size_t)__tlsdesc_dynamic; |
| 435 | reloc_addr[1] = (size_t)new; |
| 436 | } else { |
| 437 | reloc_addr[0] = (size_t)__tlsdesc_static; |
| 438 | #ifdef TLS_ABOVE_TP |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 439 | reloc_addr[1] = tls_val + def.dso->tls.offset |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 440 | + TPOFF_K + addend; |
| 441 | #else |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 442 | reloc_addr[1] = tls_val - def.dso->tls.offset |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 443 | + addend; |
| 444 | #endif |
| 445 | } |
| 446 | break; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 447 | default: |
| 448 | error("Error relocating %s: unsupported relocation type %d", |
| 449 | dso->name, type); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 450 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 451 | continue; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 452 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 453 | } |
| 454 | } |
| 455 | |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 456 | static void redo_lazy_relocs() |
| 457 | { |
| 458 | struct dso *p = lazy_head, *next; |
| 459 | lazy_head = 0; |
| 460 | for (; p; p=next) { |
| 461 | next = p->lazy_next; |
| 462 | size_t size = p->lazy_cnt*3*sizeof(size_t); |
| 463 | p->lazy_cnt = 0; |
| 464 | do_relocs(p, p->lazy, size, 3); |
| 465 | if (p->lazy_cnt) { |
| 466 | p->lazy_next = lazy_head; |
| 467 | lazy_head = p; |
| 468 | } else { |
| 469 | free(p->lazy); |
| 470 | p->lazy = 0; |
| 471 | p->lazy_next = 0; |
| 472 | } |
| 473 | } |
| 474 | } |
| 475 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 476 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 477 | * needing at least a page of dirty memory even if they have no global |
| 478 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 479 | * and "donate" them to the heap by setting up minimal malloc |
| 480 | * structures and then freeing them. */ |
| 481 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 482 | static void reclaim(struct dso *dso, size_t start, size_t end) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 483 | { |
| 484 | size_t *a, *z; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 485 | if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end; |
| 486 | 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] | 487 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 488 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 489 | if (start>end || end-start < 4*sizeof(size_t)) return; |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 490 | a = laddr(dso, start); |
| 491 | z = laddr(dso, end); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 492 | a[-2] = 1; |
| 493 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 494 | z[1] = 1; |
| 495 | free(a); |
| 496 | } |
| 497 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 498 | static void reclaim_gaps(struct dso *dso) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 499 | { |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 500 | Phdr *ph = dso->phdr; |
| 501 | size_t phcnt = dso->phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 502 | |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 503 | if (DL_FDPIC) return; // FIXME |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 504 | for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) { |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 505 | if (ph->p_type!=PT_LOAD) continue; |
| 506 | 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] | 507 | reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 508 | reclaim(dso, ph->p_vaddr+ph->p_memsz, |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 509 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 510 | } |
| 511 | } |
| 512 | |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 513 | static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t off) |
| 514 | { |
Rich Felker | 9439ebd | 2015-11-11 17:34:17 -0500 | [diff] [blame] | 515 | static int no_map_fixed; |
| 516 | char *q; |
| 517 | if (!no_map_fixed) { |
| 518 | q = mmap(p, n, prot, flags|MAP_FIXED, fd, off); |
| 519 | if (!DL_NOMMU_SUPPORT || q != MAP_FAILED || errno != EINVAL) |
| 520 | return q; |
| 521 | no_map_fixed = 1; |
| 522 | } |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 523 | /* Fallbacks for MAP_FIXED failure on NOMMU kernels. */ |
| 524 | if (flags & MAP_ANONYMOUS) { |
| 525 | memset(p, 0, n); |
| 526 | return p; |
| 527 | } |
| 528 | ssize_t r; |
| 529 | if (lseek(fd, off, SEEK_SET) < 0) return MAP_FAILED; |
| 530 | for (q=p; n; q+=r, off+=r, n-=r) { |
| 531 | r = read(fd, q, n); |
| 532 | if (r < 0 && errno != EINTR) return MAP_FAILED; |
| 533 | if (!r) { |
| 534 | memset(q, 0, n); |
| 535 | break; |
| 536 | } |
| 537 | } |
| 538 | return p; |
| 539 | } |
| 540 | |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 541 | static void unmap_library(struct dso *dso) |
| 542 | { |
| 543 | if (dso->loadmap) { |
| 544 | size_t i; |
| 545 | for (i=0; i<dso->loadmap->nsegs; i++) { |
| 546 | if (!dso->loadmap->segs[i].p_memsz) |
| 547 | continue; |
| 548 | munmap((void *)dso->loadmap->segs[i].addr, |
| 549 | dso->loadmap->segs[i].p_memsz); |
| 550 | } |
| 551 | free(dso->loadmap); |
| 552 | } else if (dso->map && dso->map_len) { |
| 553 | munmap(dso->map, dso->map_len); |
| 554 | } |
| 555 | } |
| 556 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 557 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 558 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 559 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 560 | void *allocated_buf=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 561 | size_t phsize; |
| 562 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 563 | size_t this_min, this_max; |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 564 | size_t nsegs = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 565 | off_t off_start; |
| 566 | Ehdr *eh; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 567 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 568 | unsigned prot; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 569 | unsigned char *map=MAP_FAILED, *base; |
Rich Felker | 7443dd2 | 2013-08-02 09:25:12 -0400 | [diff] [blame] | 570 | size_t dyn=0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 571 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 572 | size_t i; |
| 573 | |
| 574 | ssize_t l = read(fd, buf, sizeof buf); |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 575 | eh = buf; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 576 | if (l<0) return 0; |
| 577 | if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) |
| 578 | goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 579 | phsize = eh->e_phentsize * eh->e_phnum; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 580 | if (phsize > sizeof buf - sizeof *eh) { |
| 581 | allocated_buf = malloc(phsize); |
| 582 | if (!allocated_buf) return 0; |
| 583 | l = pread(fd, allocated_buf, phsize, eh->e_phoff); |
| 584 | if (l < 0) goto error; |
| 585 | if (l != phsize) goto noexec; |
| 586 | ph = ph0 = allocated_buf; |
| 587 | } else if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 588 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 589 | if (l < 0) goto error; |
| 590 | if (l != phsize) goto noexec; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 591 | ph = ph0 = (void *)(buf + 1); |
| 592 | } else { |
| 593 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 594 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 595 | 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] | 596 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 597 | dyn = ph->p_vaddr; |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 598 | } else if (ph->p_type == PT_TLS) { |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 599 | tls_image = ph->p_vaddr; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 600 | dso->tls.align = ph->p_align; |
| 601 | dso->tls.len = ph->p_filesz; |
| 602 | dso->tls.size = ph->p_memsz; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 603 | } else if (ph->p_type == PT_GNU_RELRO) { |
| 604 | dso->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 605 | dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 606 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 607 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 608 | nsegs++; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 609 | if (ph->p_vaddr < addr_min) { |
| 610 | addr_min = ph->p_vaddr; |
| 611 | off_start = ph->p_offset; |
| 612 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 613 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 614 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 615 | } |
| 616 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 617 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 618 | } |
| 619 | } |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 620 | if (!dyn) goto noexec; |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 621 | if (DL_FDPIC && !(eh->e_flags & FDPIC_CONSTDISP_FLAG)) { |
| 622 | dso->loadmap = calloc(1, sizeof *dso->loadmap |
| 623 | + nsegs * sizeof *dso->loadmap->segs); |
| 624 | if (!dso->loadmap) goto error; |
| 625 | dso->loadmap->nsegs = nsegs; |
| 626 | for (ph=ph0, i=0; i<nsegs; ph=(void *)((char *)ph+eh->e_phentsize)) { |
| 627 | if (ph->p_type != PT_LOAD) continue; |
| 628 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 629 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 630 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 631 | map = mmap(0, ph->p_memsz + (ph->p_vaddr & PAGE_SIZE-1), |
Rich Felker | 5fe3851 | 2015-11-15 21:28:41 -0500 | [diff] [blame] | 632 | prot, MAP_PRIVATE, |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 633 | fd, ph->p_offset & -PAGE_SIZE); |
| 634 | if (map == MAP_FAILED) { |
| 635 | unmap_library(dso); |
| 636 | goto error; |
| 637 | } |
| 638 | dso->loadmap->segs[i].addr = (size_t)map + |
| 639 | (ph->p_vaddr & PAGE_SIZE-1); |
| 640 | dso->loadmap->segs[i].p_vaddr = ph->p_vaddr; |
| 641 | dso->loadmap->segs[i].p_memsz = ph->p_memsz; |
| 642 | i++; |
Rich Felker | fead7e3 | 2015-10-28 21:45:31 -0400 | [diff] [blame] | 643 | if (prot & PROT_WRITE) { |
| 644 | size_t brk = (ph->p_vaddr & PAGE_SIZE-1) |
| 645 | + ph->p_filesz; |
| 646 | size_t pgbrk = brk + PAGE_SIZE-1 & -PAGE_SIZE; |
| 647 | size_t pgend = brk + ph->p_memsz - ph->p_filesz |
| 648 | + PAGE_SIZE-1 & -PAGE_SIZE; |
| 649 | if (pgend > pgbrk && mmap_fixed(map+pgbrk, |
| 650 | pgend-pgbrk, prot, |
| 651 | MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, |
| 652 | -1, off_start) == MAP_FAILED) |
| 653 | goto error; |
| 654 | memset(map + brk, 0, pgbrk-brk); |
| 655 | } |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 656 | } |
| 657 | map = (void *)dso->loadmap->segs[0].addr; |
| 658 | map_len = 0; |
| 659 | goto done_mapping; |
| 660 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 661 | addr_max += PAGE_SIZE-1; |
| 662 | addr_max &= -PAGE_SIZE; |
| 663 | addr_min &= -PAGE_SIZE; |
| 664 | off_start &= -PAGE_SIZE; |
| 665 | map_len = addr_max - addr_min + off_start; |
| 666 | /* The first time, we map too much, possibly even more than |
| 667 | * the length of the file. This is okay because we will not |
| 668 | * use the invalid part; we just need to reserve the right |
| 669 | * amount of virtual address space to map over later. */ |
Rich Felker | 9439ebd | 2015-11-11 17:34:17 -0500 | [diff] [blame] | 670 | map = DL_NOMMU_SUPPORT |
| 671 | ? mmap((void *)addr_min, map_len, PROT_READ|PROT_WRITE|PROT_EXEC, |
| 672 | MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) |
| 673 | : mmap((void *)addr_min, map_len, prot, |
| 674 | MAP_PRIVATE, fd, off_start); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 675 | if (map==MAP_FAILED) goto error; |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 676 | dso->map = map; |
| 677 | dso->map_len = map_len; |
Rich Felker | 339516a | 2013-07-31 14:42:08 -0400 | [diff] [blame] | 678 | /* If the loaded file is not relocatable and the requested address is |
| 679 | * not available, then the load operation must fail. */ |
| 680 | if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { |
| 681 | errno = EBUSY; |
| 682 | goto error; |
| 683 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 684 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 685 | dso->phdr = 0; |
| 686 | dso->phnum = 0; |
| 687 | 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] | 688 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 689 | /* Check if the programs headers are in this load segment, and |
| 690 | * if so, record the address for use by dl_iterate_phdr. */ |
| 691 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 692 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 693 | dso->phdr = (void *)(base + ph->p_vaddr |
| 694 | + (eh->e_phoff-ph->p_offset)); |
| 695 | dso->phnum = eh->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 696 | dso->phentsize = eh->e_phentsize; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 697 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 698 | /* Reuse the existing mapping for the lowest-address LOAD */ |
Rich Felker | 9439ebd | 2015-11-11 17:34:17 -0500 | [diff] [blame] | 699 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min && !DL_NOMMU_SUPPORT) |
| 700 | continue; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 701 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 702 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 703 | off_start = ph->p_offset & -PAGE_SIZE; |
| 704 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 705 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 706 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 707 | 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] | 708 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 709 | if (ph->p_memsz > ph->p_filesz) { |
| 710 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 711 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 712 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | ce337da | 2015-06-23 04:03:42 +0000 | [diff] [blame] | 713 | 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] | 714 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 715 | } |
| 716 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 717 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 718 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | 75eceb3 | 2015-06-17 17:21:46 +0000 | [diff] [blame] | 719 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) |
| 720 | && errno != ENOSYS) |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 721 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 722 | break; |
| 723 | } |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 724 | done_mapping: |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 725 | dso->base = base; |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 726 | dso->dynv = laddr(dso, dyn); |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 727 | if (dso->tls.size) dso->tls.image = laddr(dso, tls_image); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 728 | if (!runtime) reclaim_gaps(dso); |
Rich Felker | 8d01dfc | 2013-08-02 09:59:02 -0400 | [diff] [blame] | 729 | free(allocated_buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 730 | return map; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 731 | noexec: |
| 732 | errno = ENOEXEC; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 733 | error: |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 734 | if (map!=MAP_FAILED) unmap_library(dso); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 735 | free(allocated_buf); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 736 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 737 | } |
| 738 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 739 | 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] | 740 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 741 | size_t l; |
| 742 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 743 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 744 | s += strspn(s, ":\n"); |
| 745 | l = strcspn(s, ":\n"); |
| 746 | if (l-1 >= INT_MAX) return -1; |
Rich Felker | 5d1c8c9 | 2015-04-01 20:27:29 -0400 | [diff] [blame] | 747 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) < buf_size) { |
| 748 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
| 749 | switch (errno) { |
| 750 | case ENOENT: |
| 751 | case ENOTDIR: |
| 752 | case EACCES: |
| 753 | case ENAMETOOLONG: |
| 754 | break; |
| 755 | default: |
| 756 | /* Any negative value but -1 will inhibit |
| 757 | * futher path search. */ |
| 758 | return -2; |
| 759 | } |
| 760 | } |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 761 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 762 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 763 | } |
| 764 | |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 765 | static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) |
| 766 | { |
| 767 | size_t n, l; |
| 768 | const char *s, *t, *origin; |
| 769 | char *d; |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 770 | if (p->rpath || !p->rpath_orig) return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 771 | if (!strchr(p->rpath_orig, '$')) { |
| 772 | p->rpath = p->rpath_orig; |
| 773 | return 0; |
| 774 | } |
| 775 | n = 0; |
| 776 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 777 | while ((t=strchr(s, '$'))) { |
| 778 | if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 779 | return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 780 | s = t+1; |
| 781 | n++; |
| 782 | } |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 783 | if (n > SSIZE_MAX/PATH_MAX) return 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 784 | |
| 785 | if (p->kernel_mapped) { |
| 786 | /* $ORIGIN searches cannot be performed for the main program |
| 787 | * when it is suid/sgid/AT_SECURE. This is because the |
| 788 | * pathname is under the control of the caller of execve. |
| 789 | * For libraries, however, $ORIGIN can be processed safely |
| 790 | * since the library's pathname came from a trusted source |
| 791 | * (either system paths or a call to dlopen). */ |
| 792 | if (libc.secure) |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 793 | return 0; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 794 | l = readlink("/proc/self/exe", buf, buf_size); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 795 | if (l == -1) switch (errno) { |
| 796 | case ENOENT: |
| 797 | case ENOTDIR: |
| 798 | case EACCES: |
| 799 | break; |
| 800 | default: |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 801 | return -1; |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 802 | } |
| 803 | if (l >= buf_size) |
| 804 | return 0; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 805 | buf[l] = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 806 | origin = buf; |
| 807 | } else { |
| 808 | origin = p->name; |
| 809 | } |
| 810 | t = strrchr(origin, '/'); |
| 811 | l = t ? t-origin : 0; |
| 812 | p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); |
| 813 | if (!p->rpath) return -1; |
| 814 | |
| 815 | d = p->rpath; |
| 816 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 817 | while ((t=strchr(s, '$'))) { |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 818 | memcpy(d, s, t-s); |
| 819 | d += t-s; |
| 820 | memcpy(d, origin, l); |
| 821 | d += l; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 822 | /* It was determined previously that the '$' is followed |
| 823 | * either by "ORIGIN" or "{ORIGIN}". */ |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 824 | s = t + 7 + 2*(t[1]=='{'); |
| 825 | } |
| 826 | strcpy(d, s); |
| 827 | return 0; |
| 828 | } |
| 829 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 830 | static void decode_dyn(struct dso *p) |
| 831 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 832 | size_t dyn[DYN_CNT]; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 833 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 834 | p->syms = laddr(p, dyn[DT_SYMTAB]); |
| 835 | p->strings = laddr(p, dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 836 | if (dyn[0]&(1<<DT_HASH)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 837 | p->hashtab = laddr(p, dyn[DT_HASH]); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 838 | if (dyn[0]&(1<<DT_RPATH)) |
Rich Felker | e6076c9 | 2015-09-17 19:21:55 +0000 | [diff] [blame] | 839 | p->rpath_orig = p->strings + dyn[DT_RPATH]; |
Rich Felker | d8dc2b7 | 2014-11-23 16:17:57 -0500 | [diff] [blame] | 840 | if (dyn[0]&(1<<DT_RUNPATH)) |
Rich Felker | e6076c9 | 2015-09-17 19:21:55 +0000 | [diff] [blame] | 841 | p->rpath_orig = p->strings + dyn[DT_RUNPATH]; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 842 | if (dyn[0]&(1<<DT_PLTGOT)) |
| 843 | p->got = laddr(p, dyn[DT_PLTGOT]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 844 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 845 | p->ghashtab = laddr(p, *dyn); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 846 | if (search_vec(p->dynv, dyn, DT_VERSYM)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 847 | p->versym = laddr(p, *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 848 | } |
| 849 | |
Rich Felker | 3958144 | 2015-09-21 21:47:50 +0000 | [diff] [blame] | 850 | static size_t count_syms(struct dso *p) |
| 851 | { |
| 852 | if (p->hashtab) return p->hashtab[1]; |
| 853 | |
| 854 | size_t nsym, i; |
| 855 | uint32_t *buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 856 | uint32_t *hashval; |
| 857 | for (i = nsym = 0; i < p->ghashtab[0]; i++) { |
| 858 | if (buckets[i] > nsym) |
| 859 | nsym = buckets[i]; |
| 860 | } |
| 861 | if (nsym) { |
| 862 | hashval = buckets + p->ghashtab[0] + (nsym - p->ghashtab[1]); |
| 863 | do nsym++; |
| 864 | while (!(*hashval++ & 1)); |
| 865 | } |
| 866 | return nsym; |
| 867 | } |
| 868 | |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 869 | static void *dl_mmap(size_t n) |
| 870 | { |
| 871 | void *p; |
| 872 | int prot = PROT_READ|PROT_WRITE, flags = MAP_ANONYMOUS|MAP_PRIVATE; |
| 873 | #ifdef SYS_mmap2 |
| 874 | p = (void *)__syscall(SYS_mmap2, 0, n, prot, flags, -1, 0); |
| 875 | #else |
| 876 | p = (void *)__syscall(SYS_mmap, 0, n, prot, flags, -1, 0); |
| 877 | #endif |
| 878 | return p == MAP_FAILED ? 0 : p; |
| 879 | } |
| 880 | |
| 881 | static void makefuncdescs(struct dso *p) |
| 882 | { |
| 883 | static int self_done; |
| 884 | size_t nsym = count_syms(p); |
| 885 | size_t i, size = nsym * sizeof(*p->funcdescs); |
| 886 | |
| 887 | if (!self_done) { |
| 888 | p->funcdescs = dl_mmap(size); |
| 889 | self_done = 1; |
| 890 | } else { |
| 891 | p->funcdescs = malloc(size); |
| 892 | } |
| 893 | if (!p->funcdescs) { |
| 894 | if (!runtime) a_crash(); |
| 895 | error("Error allocating function descriptors for %s", p->name); |
| 896 | longjmp(*rtld_fail, 1); |
| 897 | } |
| 898 | for (i=0; i<nsym; i++) { |
| 899 | if ((p->syms[i].st_info&0xf)==STT_FUNC && p->syms[i].st_shndx) { |
| 900 | p->funcdescs[i].addr = laddr(p, p->syms[i].st_value); |
| 901 | p->funcdescs[i].got = p->got; |
| 902 | } else { |
| 903 | p->funcdescs[i].addr = 0; |
| 904 | p->funcdescs[i].got = 0; |
| 905 | } |
| 906 | } |
| 907 | } |
| 908 | |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 909 | static struct dso *load_library(const char *name, struct dso *needed_by) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 910 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 911 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 912 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 913 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 914 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 915 | int fd; |
| 916 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 917 | size_t alloc_size; |
| 918 | int n_th = 0; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 919 | int is_self = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 920 | |
Rich Felker | 5954931 | 2014-07-11 00:29:44 -0400 | [diff] [blame] | 921 | if (!*name) { |
| 922 | errno = EINVAL; |
| 923 | return 0; |
| 924 | } |
| 925 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 926 | /* Catch and block attempts to reload the implementation itself */ |
| 927 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
Szabolcs Nagy | 86e8cc0 | 2016-11-01 02:44:56 +0100 | [diff] [blame] | 928 | static const char reserved[] = |
Szabolcs Nagy | 5ffe515 | 2016-11-01 02:49:09 +0100 | [diff] [blame] | 929 | "c.pthread.rt.m.dl.util.xnet."; |
| 930 | const char *rp, *next; |
| 931 | for (rp=reserved; *rp; rp=next) { |
| 932 | next = strchr(rp, '.') + 1; |
| 933 | if (strncmp(name+3, rp, next-rp) == 0) |
| 934 | break; |
| 935 | } |
| 936 | if (*rp) { |
| 937 | if (ldd_mode) { |
| 938 | /* Track which names have been resolved |
| 939 | * and only report each one once. */ |
| 940 | static unsigned reported; |
| 941 | unsigned mask = 1U<<(rp-reserved); |
| 942 | if (!(reported & mask)) { |
| 943 | reported |= mask; |
| 944 | dprintf(1, "\t%s => %s (%p)\n", |
| 945 | name, ldso.name, |
| 946 | ldso.base); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 947 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 948 | } |
Szabolcs Nagy | 5ffe515 | 2016-11-01 02:49:09 +0100 | [diff] [blame] | 949 | is_self = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 950 | } |
| 951 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 952 | if (!strcmp(name, ldso.name)) is_self = 1; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 953 | if (is_self) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 954 | if (!ldso.prev) { |
| 955 | tail->next = &ldso; |
| 956 | ldso.prev = tail; |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 957 | tail = &ldso; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 958 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 959 | return &ldso; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 960 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 961 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 962 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 963 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 964 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 965 | /* Search for the name to see if it's already loaded */ |
| 966 | for (p=head->next; p; p=p->next) { |
| 967 | if (p->shortname && !strcmp(p->shortname, name)) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 968 | return p; |
| 969 | } |
| 970 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 971 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 972 | fd = -1; |
Rich Felker | 3e3753c | 2013-08-02 10:02:29 -0400 | [diff] [blame] | 973 | if (env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 974 | for (p=needed_by; fd == -1 && p; p=p->needed_by) { |
| 975 | if (fixup_rpath(p, buf, sizeof buf) < 0) |
| 976 | fd = -2; /* Inhibit further search. */ |
| 977 | if (p->rpath) |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 978 | fd = path_open(name, p->rpath, buf, sizeof buf); |
Rich Felker | 2963a9f | 2015-04-03 16:35:43 -0400 | [diff] [blame] | 979 | } |
Rich Felker | 5d1c8c9 | 2015-04-01 20:27:29 -0400 | [diff] [blame] | 980 | if (fd == -1) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 981 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 982 | char *prefix = 0; |
| 983 | size_t prefix_len; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 984 | if (ldso.name[0]=='/') { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 985 | char *s, *t, *z; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 986 | for (s=t=z=ldso.name; *s; s++) |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 987 | if (*s=='/') z=t, t=s; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 988 | prefix_len = z-ldso.name; |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 989 | if (prefix_len < PATH_MAX) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 990 | prefix = ldso.name; |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 991 | } |
| 992 | if (!prefix) { |
| 993 | prefix = ""; |
| 994 | prefix_len = 0; |
| 995 | } |
| 996 | char etc_ldso_path[prefix_len + 1 |
| 997 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 998 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 999 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 1000 | (int)prefix_len, prefix); |
| 1001 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1002 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 1003 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 1004 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 1005 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 1006 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1007 | fclose(f); |
Rich Felker | ff4be70 | 2013-09-09 13:39:08 -0400 | [diff] [blame] | 1008 | } else if (errno != ENOENT) { |
| 1009 | sys_path = ""; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1010 | } |
| 1011 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 1012 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 1013 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1014 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1015 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1016 | } |
| 1017 | if (fd < 0) return 0; |
| 1018 | if (fstat(fd, &st) < 0) { |
| 1019 | close(fd); |
| 1020 | return 0; |
| 1021 | } |
| 1022 | for (p=head->next; p; p=p->next) { |
| 1023 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1024 | /* If this library was previously loaded with a |
| 1025 | * pathname but a search found the same inode, |
| 1026 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 1027 | if (!p->shortname && pathname != name) |
| 1028 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1029 | close(fd); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1030 | return p; |
| 1031 | } |
| 1032 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1033 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1034 | close(fd); |
| 1035 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1036 | |
Rich Felker | c49d3c8 | 2017-03-14 18:51:27 -0400 | [diff] [blame] | 1037 | /* Avoid the danger of getting two versions of libc mapped into the |
| 1038 | * same process when an absolute pathname was used. The symbols |
| 1039 | * checked are chosen to catch both musl and glibc, and to avoid |
| 1040 | * false positives from interposition-hack libraries. */ |
| 1041 | decode_dyn(&temp_dso); |
| 1042 | if (find_sym(&temp_dso, "__libc_start_main", 1).sym && |
| 1043 | find_sym(&temp_dso, "stdin", 1).sym) { |
| 1044 | unmap_library(&temp_dso); |
| 1045 | return load_library("libc.so", needed_by); |
| 1046 | } |
| 1047 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1048 | /* Allocate storage for the new DSO. When there is TLS, this |
| 1049 | * storage must include a reservation for all pre-existing |
| 1050 | * threads to obtain copies of both the new TLS, and an |
| 1051 | * extended DTV capable of storing an additional slot for |
| 1052 | * the newly-loaded DSO. */ |
| 1053 | alloc_size = sizeof *p + strlen(pathname) + 1; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1054 | if (runtime && temp_dso.tls.image) { |
| 1055 | size_t per_th = temp_dso.tls.size + temp_dso.tls.align |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1056 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1057 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1058 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 1059 | else alloc_size += n_th * per_th; |
| 1060 | } |
| 1061 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1062 | if (!p) { |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 1063 | unmap_library(&temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1064 | return 0; |
| 1065 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1066 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1067 | p->dev = st.st_dev; |
| 1068 | p->ino = st.st_ino; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 1069 | p->needed_by = needed_by; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 1070 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1071 | strcpy(p->name, pathname); |
| 1072 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 1073 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1074 | if (p->tls.image) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1075 | p->tls_id = ++tls_cnt; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1076 | tls_align = MAXP2(tls_align, p->tls.align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1077 | #ifdef TLS_ABOVE_TP |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1078 | p->tls.offset = tls_offset + ( (tls_align-1) & |
| 1079 | -(tls_offset + (uintptr_t)p->tls.image) ); |
| 1080 | tls_offset += p->tls.size; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1081 | #else |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1082 | tls_offset += p->tls.size + p->tls.align - 1; |
| 1083 | tls_offset -= (tls_offset + (uintptr_t)p->tls.image) |
| 1084 | & (p->tls.align-1); |
| 1085 | p->tls.offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1086 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1087 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 1088 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 1089 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1090 | if (tls_tail) tls_tail->next = &p->tls; |
| 1091 | else libc.tls_head = &p->tls; |
| 1092 | tls_tail = &p->tls; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1093 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1094 | |
| 1095 | tail->next = p; |
| 1096 | p->prev = tail; |
| 1097 | tail = p; |
| 1098 | |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1099 | if (DL_FDPIC) makefuncdescs(p); |
| 1100 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 1101 | 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] | 1102 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1103 | return p; |
| 1104 | } |
| 1105 | |
| 1106 | static void load_deps(struct dso *p) |
| 1107 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1108 | size_t i, ndeps=0; |
| 1109 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1110 | for (; p; p=p->next) { |
| 1111 | for (i=0; p->dynv[i]; i+=2) { |
| 1112 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 1113 | dep = load_library(p->strings + p->dynv[i+1], p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1114 | if (!dep) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 1115 | error("Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 1116 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1117 | if (runtime) longjmp(*rtld_fail, 1); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1118 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 1119 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1120 | if (runtime) { |
| 1121 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1122 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1123 | tmp[ndeps++] = dep; |
| 1124 | tmp[ndeps] = 0; |
| 1125 | *deps = tmp; |
| 1126 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1127 | } |
| 1128 | } |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 1129 | if (!*deps) *deps = (struct dso **)&nodeps_dummy; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1130 | } |
| 1131 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1132 | static void load_preload(char *s) |
| 1133 | { |
| 1134 | int tmp; |
| 1135 | char *z; |
| 1136 | for (z=s; *z; s=z) { |
Rich Felker | 349381a | 2014-07-11 00:26:12 -0400 | [diff] [blame] | 1137 | for ( ; *s && (isspace(*s) || *s==':'); s++); |
| 1138 | for (z=s; *z && !isspace(*z) && *z!=':'; z++); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1139 | tmp = *z; |
| 1140 | *z = 0; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 1141 | load_library(s, 0); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1142 | *z = tmp; |
| 1143 | } |
| 1144 | } |
| 1145 | |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1146 | static void add_syms(struct dso *p) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1147 | { |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1148 | if (!p->syms_next && syms_tail != p) { |
| 1149 | syms_tail->syms_next = p; |
| 1150 | syms_tail = p; |
| 1151 | } |
| 1152 | } |
| 1153 | |
| 1154 | static void revert_syms(struct dso *old_tail) |
| 1155 | { |
| 1156 | struct dso *p, *next; |
| 1157 | /* Chop off the tail of the list of dsos that participate in |
| 1158 | * the global symbol table, reverting them to RTLD_LOCAL. */ |
| 1159 | for (p=old_tail; p; p=next) { |
| 1160 | next = p->syms_next; |
| 1161 | p->syms_next = 0; |
| 1162 | } |
| 1163 | syms_tail = old_tail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1164 | } |
| 1165 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1166 | static void do_mips_relocs(struct dso *p, size_t *got) |
| 1167 | { |
| 1168 | size_t i, j, rel[2]; |
| 1169 | unsigned char *base = p->base; |
| 1170 | i=0; search_vec(p->dynv, &i, DT_MIPS_LOCAL_GOTNO); |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1171 | if (p==&ldso) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1172 | got += i; |
| 1173 | } else { |
| 1174 | while (i--) *got++ += (size_t)base; |
| 1175 | } |
| 1176 | j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM); |
| 1177 | i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO); |
| 1178 | Sym *sym = p->syms + j; |
| 1179 | rel[0] = (unsigned char *)got - base; |
| 1180 | for (i-=j; i; i--, sym++, rel[0]+=sizeof(size_t)) { |
Rich Felker | 71392a9 | 2016-03-06 17:25:52 +0000 | [diff] [blame] | 1181 | rel[1] = R_INFO(sym-p->syms, R_MIPS_JUMP_SLOT); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1182 | do_relocs(p, rel, sizeof rel, 2); |
| 1183 | } |
| 1184 | } |
| 1185 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1186 | static void reloc_all(struct dso *p) |
| 1187 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1188 | size_t dyn[DYN_CNT]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1189 | for (; p; p=p->next) { |
| 1190 | if (p->relocated) continue; |
| 1191 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1192 | if (NEED_MIPS_GOT_RELOCS) |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1193 | do_mips_relocs(p, laddr(p, dyn[DT_PLTGOT])); |
| 1194 | do_relocs(p, laddr(p, dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 1195 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1196 | do_relocs(p, laddr(p, dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 1197 | do_relocs(p, laddr(p, dyn[DT_RELA]), dyn[DT_RELASZ], 3); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1198 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1199 | if (head != &ldso && p->relro_start != p->relro_end && |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1200 | 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] | 1201 | && errno != ENOSYS) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 1202 | error("Error relocating %s: RELRO protection failed: %m", |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1203 | p->name); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1204 | if (runtime) longjmp(*rtld_fail, 1); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1205 | } |
| 1206 | |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 1207 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1208 | } |
| 1209 | } |
| 1210 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1211 | static void kernel_mapped_dso(struct dso *p) |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1212 | { |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1213 | size_t min_addr = -1, max_addr = 0, cnt; |
| 1214 | Phdr *ph = p->phdr; |
| 1215 | for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { |
| 1216 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1217 | p->dynv = laddr(p, ph->p_vaddr); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1218 | } else if (ph->p_type == PT_GNU_RELRO) { |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1219 | p->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 1220 | p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
| 1221 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1222 | if (ph->p_type != PT_LOAD) continue; |
| 1223 | if (ph->p_vaddr < min_addr) |
| 1224 | min_addr = ph->p_vaddr; |
| 1225 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 1226 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 1227 | } |
| 1228 | min_addr &= -PAGE_SIZE; |
| 1229 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 1230 | p->map = p->base + min_addr; |
| 1231 | p->map_len = max_addr - min_addr; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1232 | p->kernel_mapped = 1; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1233 | } |
| 1234 | |
Rich Felker | ad1cd43 | 2015-11-11 22:08:23 -0500 | [diff] [blame] | 1235 | void __libc_exit_fini() |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1236 | { |
| 1237 | struct dso *p; |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1238 | size_t dyn[DYN_CNT]; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1239 | for (p=fini_head; p; p=p->fini_next) { |
| 1240 | if (!p->constructed) continue; |
| 1241 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1242 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 1243 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1244 | size_t *fn = (size_t *)laddr(p, dyn[DT_FINI_ARRAY])+n; |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 1245 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1246 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1247 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 1248 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1249 | fpaddr(p, dyn[DT_FINI])(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1250 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1251 | } |
| 1252 | } |
| 1253 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1254 | static void do_init_fini(struct dso *p) |
| 1255 | { |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1256 | size_t dyn[DYN_CNT]; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1257 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1258 | /* Allow recursive calls that arise when a library calls |
| 1259 | * dlopen from one of its constructors, but block any |
| 1260 | * other threads until all ctors have finished. */ |
| 1261 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1262 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1263 | if (p->constructed) continue; |
| 1264 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1265 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1266 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1267 | p->fini_next = fini_head; |
| 1268 | fini_head = p; |
| 1269 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1270 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 1271 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1272 | fpaddr(p, dyn[DT_INIT])(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 1273 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1274 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 1275 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1276 | size_t *fn = laddr(p, dyn[DT_INIT_ARRAY]); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 1277 | while (n--) ((void (*)(void))*fn++)(); |
| 1278 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 1279 | if (!need_locking && libc.threads_minus_1) { |
| 1280 | need_locking = 1; |
| 1281 | pthread_mutex_lock(&init_fini_lock); |
| 1282 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1283 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1284 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1285 | } |
| 1286 | |
Rich Felker | c87a521 | 2015-09-22 20:24:28 +0000 | [diff] [blame] | 1287 | void __libc_start_init(void) |
| 1288 | { |
| 1289 | do_init_fini(tail); |
| 1290 | } |
| 1291 | |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1292 | static void dl_debug_state(void) |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1293 | { |
| 1294 | } |
| 1295 | |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1296 | weak_alias(dl_debug_state, _dl_debug_state); |
| 1297 | |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1298 | void __init_tls(size_t *auxv) |
Rich Felker | 7c6c290 | 2013-08-03 16:27:30 -0400 | [diff] [blame] | 1299 | { |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1300 | } |
| 1301 | |
Rich Felker | bc081f6 | 2015-04-14 10:42:44 -0400 | [diff] [blame] | 1302 | __attribute__((__visibility__("hidden"))) |
rofl0r | 1f53e7d | 2017-01-13 10:28:46 +0000 | [diff] [blame] | 1303 | void *__tls_get_new(tls_mod_off_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1304 | { |
| 1305 | pthread_t self = __pthread_self(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1306 | |
| 1307 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 1308 | sigset_t set; |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1309 | __block_all_sigs(&set); |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1310 | if (v[0]<=(size_t)self->dtv[0]) { |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1311 | __restore_sigs(&set); |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 1312 | return (char *)self->dtv[v[0]]+v[1]+DTP_OFFSET; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1313 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1314 | |
| 1315 | /* This is safe without any locks held because, if the caller |
| 1316 | * is able to request the Nth entry of the DTV, the DSO list |
| 1317 | * must be valid at least that far out and it was synchronized |
| 1318 | * at program startup or by an already-completed call to dlopen. */ |
| 1319 | struct dso *p; |
| 1320 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 1321 | |
| 1322 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1323 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1324 | void **newdtv = p->new_dtv + |
Szabolcs Nagy | 12978ac | 2015-11-26 19:59:46 +0100 | [diff] [blame] | 1325 | (v[0]+1)*a_fetch_add(&p->new_dtv_idx,1); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1326 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1327 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 1328 | newdtv[0] = (void *)v[0]; |
Szabolcs Nagy | 204a69d | 2015-03-11 12:48:12 +0000 | [diff] [blame] | 1329 | self->dtv = self->dtv_copy = newdtv; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1330 | } |
| 1331 | |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1332 | /* Get new TLS memory from all new DSOs up to the requested one */ |
| 1333 | unsigned char *mem; |
| 1334 | for (p=head; ; p=p->next) { |
| 1335 | if (!p->tls_id || self->dtv[p->tls_id]) continue; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1336 | mem = p->new_tls + (p->tls.size + p->tls.align) |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1337 | * a_fetch_add(&p->new_tls_idx,1); |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1338 | mem += ((uintptr_t)p->tls.image - (uintptr_t)mem) |
| 1339 | & (p->tls.align-1); |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1340 | self->dtv[p->tls_id] = mem; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1341 | memcpy(mem, p->tls.image, p->tls.len); |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1342 | if (p->tls_id == v[0]) break; |
| 1343 | } |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1344 | __restore_sigs(&set); |
Rich Felker | 6ba5517 | 2015-06-25 22:22:00 +0000 | [diff] [blame] | 1345 | return mem + v[1] + DTP_OFFSET; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1346 | } |
| 1347 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1348 | static void update_tls_size() |
| 1349 | { |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1350 | libc.tls_cnt = tls_cnt; |
| 1351 | libc.tls_align = tls_align; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1352 | libc.tls_size = ALIGN( |
| 1353 | (1+tls_cnt) * sizeof(void *) + |
| 1354 | tls_offset + |
| 1355 | sizeof(struct pthread) + |
| 1356 | tls_align * 2, |
| 1357 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1358 | } |
| 1359 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1360 | /* Stage 1 of the dynamic linker is defined in dlstart.c. It calls the |
| 1361 | * following stage 2 and stage 3 functions via primitive symbolic lookup |
| 1362 | * since it does not have access to their addresses to begin with. */ |
| 1363 | |
| 1364 | /* Stage 2 of the dynamic linker is called after relative relocations |
| 1365 | * have been processed. It can make function calls to static functions |
| 1366 | * and access string literals and static data, but cannot use extern |
| 1367 | * symbols. Its job is to perform symbolic relocations on the dynamic |
| 1368 | * linker itself, but some of the relocations performed may need to be |
| 1369 | * replaced later due to copy relocations in the main program. */ |
| 1370 | |
Rich Felker | bc9b6ea | 2015-10-15 17:38:54 -0400 | [diff] [blame] | 1371 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 768b82c | 2015-05-25 19:15:17 -0400 | [diff] [blame] | 1372 | void __dls2(unsigned char *base, size_t *sp) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1373 | { |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1374 | if (DL_FDPIC) { |
| 1375 | void *p1 = (void *)sp[-2]; |
| 1376 | void *p2 = (void *)sp[-1]; |
| 1377 | if (!p1) { |
| 1378 | size_t *auxv, aux[AUX_CNT]; |
| 1379 | for (auxv=sp+1+*sp+1; *auxv; auxv++); auxv++; |
| 1380 | decode_vec(auxv, aux, AUX_CNT); |
| 1381 | if (aux[AT_BASE]) ldso.base = (void *)aux[AT_BASE]; |
| 1382 | else ldso.base = (void *)(aux[AT_PHDR] & -4096); |
| 1383 | } |
| 1384 | app_loadmap = p2 ? p1 : 0; |
| 1385 | ldso.loadmap = p2 ? p2 : p1; |
| 1386 | ldso.base = laddr(&ldso, 0); |
| 1387 | } else { |
| 1388 | ldso.base = base; |
| 1389 | } |
| 1390 | Ehdr *ehdr = (void *)ldso.base; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1391 | ldso.name = ldso.shortname = "libc.so"; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1392 | ldso.phnum = ehdr->e_phnum; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1393 | ldso.phdr = laddr(&ldso, ehdr->e_phoff); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1394 | ldso.phentsize = ehdr->e_phentsize; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1395 | kernel_mapped_dso(&ldso); |
| 1396 | decode_dyn(&ldso); |
| 1397 | |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1398 | if (DL_FDPIC) makefuncdescs(&ldso); |
| 1399 | |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1400 | /* Prepare storage for to save clobbered REL addends so they |
| 1401 | * can be reused in stage 3. There should be very few. If |
| 1402 | * something goes wrong and there are a huge number, abort |
| 1403 | * instead of risking stack overflow. */ |
| 1404 | size_t dyn[DYN_CNT]; |
| 1405 | decode_vec(ldso.dynv, dyn, DYN_CNT); |
Rich Felker | 2a54733 | 2015-09-17 19:45:45 +0000 | [diff] [blame] | 1406 | size_t *rel = laddr(&ldso, dyn[DT_REL]); |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1407 | size_t rel_size = dyn[DT_RELSZ]; |
| 1408 | size_t symbolic_rel_cnt = 0; |
| 1409 | apply_addends_to = rel; |
| 1410 | for (; rel_size; rel+=2, rel_size-=2*sizeof(size_t)) |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1411 | if (!IS_RELATIVE(rel[1], ldso.syms)) symbolic_rel_cnt++; |
Rich Felker | 9bbddf7 | 2015-05-25 23:33:59 -0400 | [diff] [blame] | 1412 | if (symbolic_rel_cnt >= ADDEND_LIMIT) a_crash(); |
| 1413 | size_t addends[symbolic_rel_cnt+1]; |
| 1414 | saved_addends = addends; |
| 1415 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1416 | head = &ldso; |
| 1417 | reloc_all(&ldso); |
| 1418 | |
| 1419 | ldso.relocated = 0; |
Rich Felker | 768b82c | 2015-05-25 19:15:17 -0400 | [diff] [blame] | 1420 | |
| 1421 | /* Call dynamic linker stage-3, __dls3, looking it up |
| 1422 | * symbolically as a barrier against moving the address |
| 1423 | * load across the above relocation processing. */ |
| 1424 | struct symdef dls3_def = find_sym(&ldso, "__dls3", 0); |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1425 | if (DL_FDPIC) ((stage3_func)&ldso.funcdescs[dls3_def.sym-ldso.syms])(sp); |
| 1426 | else ((stage3_func)laddr(&ldso, dls3_def.sym->st_value))(sp); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1427 | } |
| 1428 | |
| 1429 | /* Stage 3 of the dynamic linker is called with the dynamic linker/libc |
| 1430 | * fully functional. Its job is to load (if not already loaded) and |
| 1431 | * process dependencies and relocations for the main application and |
| 1432 | * transfer control to its entry point. */ |
| 1433 | |
| 1434 | _Noreturn void __dls3(size_t *sp) |
| 1435 | { |
| 1436 | static struct dso app, vdso; |
Rich Felker | f4f9562 | 2015-04-13 22:38:18 -0400 | [diff] [blame] | 1437 | size_t aux[AUX_CNT], *auxv; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1438 | size_t i; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1439 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1440 | size_t vdso_base; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1441 | int argc = *sp; |
| 1442 | char **argv = (void *)(sp+1); |
| 1443 | char **argv_orig = argv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1444 | char **envp = argv+argc+1; |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1445 | |
Rich Felker | 75ce450 | 2015-06-07 20:55:23 +0000 | [diff] [blame] | 1446 | /* Find aux vector just past environ[] and use it to initialize |
| 1447 | * global data that may be needed before we can make syscalls. */ |
| 1448 | __environ = envp; |
| 1449 | for (i=argc+1; argv[i]; i++); |
| 1450 | libc.auxv = auxv = (void *)(argv+i+1); |
| 1451 | decode_vec(auxv, aux, AUX_CNT); |
| 1452 | __hwcap = aux[AT_HWCAP]; |
| 1453 | libc.page_size = aux[AT_PAGESZ]; |
| 1454 | libc.secure = ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
| 1455 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]); |
| 1456 | |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1457 | /* Setup early thread pointer in builtin_tls for ldso/libc itself to |
| 1458 | * use during dynamic linking. If possible it will also serve as the |
| 1459 | * thread pointer at runtime. */ |
| 1460 | libc.tls_size = sizeof builtin_tls; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1461 | libc.tls_align = tls_align; |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1462 | if (__init_tp(__copy_tls((void *)builtin_tls)) < 0) { |
Rich Felker | 19a1fe6 | 2015-04-13 19:24:51 -0400 | [diff] [blame] | 1463 | a_crash(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1464 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1465 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1466 | /* Only trust user/env if kernel says we're not suid/sgid */ |
Rich Felker | 75ce450 | 2015-06-07 20:55:23 +0000 | [diff] [blame] | 1467 | if (!libc.secure) { |
| 1468 | env_path = getenv("LD_LIBRARY_PATH"); |
| 1469 | env_preload = getenv("LD_PRELOAD"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1470 | } |
| 1471 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1472 | /* If the main program was already loaded by the kernel, |
| 1473 | * AT_PHDR will point to some location other than the dynamic |
| 1474 | * linker's program headers. */ |
| 1475 | if (aux[AT_PHDR] != (size_t)ldso.phdr) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1476 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1477 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1478 | /* 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] | 1479 | Phdr *phdr = app.phdr = (void *)aux[AT_PHDR]; |
| 1480 | app.phnum = aux[AT_PHNUM]; |
| 1481 | app.phentsize = aux[AT_PHENT]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1482 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 1483 | if (phdr->p_type == PT_PHDR) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1484 | app.base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1485 | else if (phdr->p_type == PT_INTERP) |
| 1486 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1487 | else if (phdr->p_type == PT_TLS) { |
| 1488 | tls_image = phdr->p_vaddr; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1489 | app.tls.len = phdr->p_filesz; |
| 1490 | app.tls.size = phdr->p_memsz; |
| 1491 | app.tls.align = phdr->p_align; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1492 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1493 | } |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1494 | if (DL_FDPIC) app.loadmap = app_loadmap; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1495 | if (app.tls.size) app.tls.image = laddr(&app, tls_image); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1496 | if (interp_off) ldso.name = laddr(&app, interp_off); |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1497 | if ((aux[0] & (1UL<<AT_EXECFN)) |
| 1498 | && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1499 | app.name = (char *)aux[AT_EXECFN]; |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1500 | else |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1501 | app.name = argv[0]; |
| 1502 | kernel_mapped_dso(&app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1503 | } else { |
| 1504 | int fd; |
| 1505 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 1506 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1507 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1508 | argv++; |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1509 | while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') { |
| 1510 | char *opt = argv[0]+2; |
| 1511 | *argv++ = (void *)-1; |
| 1512 | if (!*opt) { |
| 1513 | break; |
| 1514 | } else if (!memcmp(opt, "list", 5)) { |
| 1515 | ldd_mode = 1; |
| 1516 | } else if (!memcmp(opt, "library-path", 12)) { |
| 1517 | if (opt[12]=='=') env_path = opt+13; |
| 1518 | else if (opt[12]) *argv = 0; |
| 1519 | else if (*argv) env_path = *argv++; |
| 1520 | } else if (!memcmp(opt, "preload", 7)) { |
| 1521 | if (opt[7]=='=') env_preload = opt+8; |
| 1522 | else if (opt[7]) *argv = 0; |
| 1523 | else if (*argv) env_preload = *argv++; |
| 1524 | } else { |
| 1525 | argv[0] = 0; |
| 1526 | } |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1527 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1528 | argv[-1] = (void *)(argc - (argv-argv_orig)); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1529 | if (!argv[0]) { |
Rich Felker | 0f5eb3d | 2016-01-22 04:04:16 +0000 | [diff] [blame] | 1530 | dprintf(2, "musl libc (" LDSO_ARCH ")\n" |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1531 | "Version %s\n" |
| 1532 | "Dynamic Program Loader\n" |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1533 | "Usage: %s [options] [--] pathname%s\n", |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1534 | __libc_get_version(), ldname, |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1535 | ldd_mode ? "" : " [args]"); |
| 1536 | _exit(1); |
| 1537 | } |
| 1538 | fd = open(argv[0], O_RDONLY); |
| 1539 | if (fd < 0) { |
| 1540 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 1541 | _exit(1); |
| 1542 | } |
| 1543 | runtime = 1; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1544 | Ehdr *ehdr = (void *)map_library(fd, &app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1545 | if (!ehdr) { |
| 1546 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 1547 | _exit(1); |
| 1548 | } |
| 1549 | runtime = 0; |
| 1550 | close(fd); |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1551 | ldso.name = ldname; |
| 1552 | app.name = argv[0]; |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1553 | aux[AT_ENTRY] = (size_t)laddr(&app, ehdr->e_entry); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1554 | /* Find the name that would have been used for the dynamic |
| 1555 | * linker had ldd not taken its place. */ |
| 1556 | if (ldd_mode) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1557 | for (i=0; i<app.phnum; i++) { |
| 1558 | if (app.phdr[i].p_type == PT_INTERP) |
Rich Felker | 30fdc06 | 2015-09-22 19:21:57 +0000 | [diff] [blame] | 1559 | ldso.name = laddr(&app, app.phdr[i].p_vaddr); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1560 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1561 | dprintf(1, "\t%s (%p)\n", ldso.name, ldso.base); |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1562 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 1563 | } |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1564 | if (app.tls.size) { |
Rich Felker | 140ad50 | 2016-01-30 14:34:45 -0500 | [diff] [blame] | 1565 | libc.tls_head = tls_tail = &app.tls; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1566 | app.tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1567 | #ifdef TLS_ABOVE_TP |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1568 | app.tls.offset = 0; |
| 1569 | tls_offset = app.tls.size |
| 1570 | + ( -((uintptr_t)app.tls.image + app.tls.size) |
| 1571 | & (app.tls.align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1572 | #else |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1573 | tls_offset = app.tls.offset = app.tls.size |
| 1574 | + ( -((uintptr_t)app.tls.image + app.tls.size) |
| 1575 | & (app.tls.align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1576 | #endif |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1577 | tls_align = MAXP2(tls_align, app.tls.align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1578 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1579 | decode_dyn(&app); |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1580 | if (DL_FDPIC) { |
| 1581 | makefuncdescs(&app); |
| 1582 | if (!app.loadmap) { |
| 1583 | app.loadmap = (void *)&app_dummy_loadmap; |
| 1584 | app.loadmap->nsegs = 1; |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1585 | app.loadmap->segs[0].addr = (size_t)app.map; |
| 1586 | app.loadmap->segs[0].p_vaddr = (size_t)app.map |
| 1587 | - (size_t)app.base; |
| 1588 | app.loadmap->segs[0].p_memsz = app.map_len; |
Rich Felker | 7a9669e | 2015-09-22 03:54:42 +0000 | [diff] [blame] | 1589 | } |
| 1590 | argv[-3] = (void *)app.loadmap; |
| 1591 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1592 | |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1593 | /* Initial dso chain consists only of the app. */ |
| 1594 | head = tail = syms_tail = &app; |
| 1595 | |
| 1596 | /* Donate unused parts of app and library mapping to malloc */ |
| 1597 | reclaim_gaps(&app); |
| 1598 | reclaim_gaps(&ldso); |
| 1599 | |
| 1600 | /* Load preload/needed libraries, add symbols to global namespace. */ |
| 1601 | if (env_preload) load_preload(env_preload); |
| 1602 | load_deps(&app); |
| 1603 | for (struct dso *p=head; p; p=p->next) |
| 1604 | add_syms(p); |
| 1605 | |
| 1606 | /* Attach to vdso, if provided by the kernel, last so that it does |
| 1607 | * not become part of the global namespace. */ |
Bobby Bingham | 5448289 | 2016-07-25 22:52:58 -0500 | [diff] [blame] | 1608 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR) && vdso_base) { |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1609 | Ehdr *ehdr = (void *)vdso_base; |
| 1610 | Phdr *phdr = vdso.phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 1611 | vdso.phnum = ehdr->e_phnum; |
| 1612 | vdso.phentsize = ehdr->e_phentsize; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1613 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 1614 | if (phdr->p_type == PT_DYNAMIC) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1615 | vdso.dynv = (void *)(vdso_base + phdr->p_offset); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1616 | if (phdr->p_type == PT_LOAD) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1617 | vdso.base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1618 | } |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1619 | vdso.name = ""; |
| 1620 | vdso.shortname = "linux-gate.so.1"; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1621 | vdso.relocated = 1; |
| 1622 | decode_dyn(&vdso); |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1623 | vdso.prev = tail; |
| 1624 | tail->next = &vdso; |
| 1625 | tail = &vdso; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1626 | } |
| 1627 | |
Felix Fietkau | c18d05f | 2016-01-30 21:14:05 +0100 | [diff] [blame] | 1628 | for (i=0; app.dynv[i]; i+=2) { |
| 1629 | if (!DT_DEBUG_INDIRECT && app.dynv[i]==DT_DEBUG) |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1630 | app.dynv[i+1] = (size_t)&debug; |
Felix Fietkau | c18d05f | 2016-01-30 21:14:05 +0100 | [diff] [blame] | 1631 | if (DT_DEBUG_INDIRECT && app.dynv[i]==DT_DEBUG_INDIRECT) { |
| 1632 | size_t *ptr = (size_t *) app.dynv[i+1]; |
| 1633 | *ptr = (size_t)&debug; |
| 1634 | } |
| 1635 | } |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1636 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1637 | /* The main program must be relocated LAST since it may contin |
| 1638 | * copy relocations which depend on libraries' relocations. */ |
| 1639 | reloc_all(app.next); |
| 1640 | reloc_all(&app); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1641 | |
| 1642 | update_tls_size(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1643 | if (libc.tls_size > sizeof builtin_tls || tls_align > MIN_TLS_ALIGN) { |
| 1644 | void *initial_tls = calloc(libc.tls_size, 1); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1645 | if (!initial_tls) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1646 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1647 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1648 | _exit(127); |
| 1649 | } |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1650 | if (__init_tp(__copy_tls(initial_tls)) < 0) { |
Rich Felker | 19a1fe6 | 2015-04-13 19:24:51 -0400 | [diff] [blame] | 1651 | a_crash(); |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1652 | } |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1653 | } else { |
Rich Felker | 71f099c | 2015-04-13 18:40:52 -0400 | [diff] [blame] | 1654 | size_t tmp_tls_size = libc.tls_size; |
| 1655 | pthread_t self = __pthread_self(); |
| 1656 | /* Temporarily set the tls size to the full size of |
| 1657 | * builtin_tls so that __copy_tls will use the same layout |
| 1658 | * as it did for before. Then check, just to be safe. */ |
| 1659 | libc.tls_size = sizeof builtin_tls; |
| 1660 | if (__copy_tls((void*)builtin_tls) != self) a_crash(); |
| 1661 | libc.tls_size = tmp_tls_size; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1662 | } |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1663 | static_tls_cnt = tls_cnt; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1664 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1665 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1666 | if (ldd_mode) _exit(0); |
| 1667 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1668 | /* Switch to runtime mode: any further failures in the dynamic |
| 1669 | * linker are a reportable failure rather than a fatal startup |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1670 | * error. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1671 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1672 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1673 | debug.ver = 1; |
Rich Felker | 326e126 | 2015-04-17 23:23:05 -0400 | [diff] [blame] | 1674 | debug.bp = dl_debug_state; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1675 | debug.head = head; |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1676 | debug.base = ldso.base; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1677 | debug.state = 0; |
| 1678 | _dl_debug_state(); |
| 1679 | |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1680 | errno = 0; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1681 | |
Rich Felker | f3ddd17 | 2015-04-13 02:56:26 -0400 | [diff] [blame] | 1682 | CRTJMP((void *)aux[AT_ENTRY], argv-1); |
| 1683 | for(;;); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1684 | } |
| 1685 | |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1686 | static void prepare_lazy(struct dso *p) |
| 1687 | { |
| 1688 | size_t dyn[DYN_CNT], n, flags1=0; |
| 1689 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 1690 | search_vec(p->dynv, &flags1, DT_FLAGS_1); |
| 1691 | if (dyn[DT_BIND_NOW] || (dyn[DT_FLAGS] & DF_BIND_NOW) || (flags1 & DF_1_NOW)) |
| 1692 | return; |
| 1693 | n = dyn[DT_RELSZ]/2 + dyn[DT_RELASZ]/3 + dyn[DT_PLTRELSZ]/2 + 1; |
| 1694 | if (NEED_MIPS_GOT_RELOCS) { |
| 1695 | size_t j=0; search_vec(p->dynv, &j, DT_MIPS_GOTSYM); |
| 1696 | size_t i=0; search_vec(p->dynv, &i, DT_MIPS_SYMTABNO); |
| 1697 | n += i-j; |
| 1698 | } |
| 1699 | p->lazy = calloc(n, 3*sizeof(size_t)); |
| 1700 | if (!p->lazy) { |
| 1701 | error("Error preparing lazy relocation for %s: %m", p->name); |
| 1702 | longjmp(*rtld_fail, 1); |
| 1703 | } |
| 1704 | p->lazy_next = lazy_head; |
| 1705 | lazy_head = p; |
| 1706 | } |
| 1707 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1708 | void *dlopen(const char *file, int mode) |
| 1709 | { |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1710 | struct dso *volatile p, *orig_tail, *orig_syms_tail, *orig_lazy_head, *next; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1711 | struct tls_module *orig_tls_tail; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1712 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1713 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1714 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1715 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1716 | |
| 1717 | if (!file) return head; |
| 1718 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1719 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1720 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1721 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1722 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1723 | p = 0; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1724 | orig_tls_tail = tls_tail; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1725 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1726 | orig_tls_offset = tls_offset; |
| 1727 | orig_tls_align = tls_align; |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1728 | orig_lazy_head = lazy_head; |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1729 | orig_syms_tail = syms_tail; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1730 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1731 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1732 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1733 | rtld_fail = &jb; |
| 1734 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1735 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1736 | revert_syms(orig_syms_tail); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1737 | for (p=orig_tail->next; p; p=next) { |
| 1738 | next = p->next; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1739 | while (p->td_index) { |
| 1740 | void *tmp = p->td_index->next; |
| 1741 | free(p->td_index); |
| 1742 | p->td_index = tmp; |
| 1743 | } |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 1744 | free(p->funcdescs); |
Rich Felker | 0770962 | 2015-04-04 00:15:19 -0400 | [diff] [blame] | 1745 | if (p->rpath != p->rpath_orig) |
| 1746 | free(p->rpath); |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 1747 | if (p->deps != &nodeps_dummy) |
| 1748 | free(p->deps); |
Rich Felker | eaf7ab6 | 2015-09-22 19:12:48 +0000 | [diff] [blame] | 1749 | unmap_library(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1750 | free(p); |
| 1751 | } |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1752 | if (!orig_tls_tail) libc.tls_head = 0; |
| 1753 | tls_tail = orig_tls_tail; |
Rich Felker | 27b3fd6 | 2017-01-04 22:54:06 -0500 | [diff] [blame] | 1754 | if (tls_tail) tls_tail->next = 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1755 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1756 | tls_offset = orig_tls_offset; |
| 1757 | tls_align = orig_tls_align; |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1758 | lazy_head = orig_lazy_head; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1759 | tail = orig_tail; |
| 1760 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1761 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1762 | goto end; |
Rich Felker | 0f9b1f6 | 2013-08-23 23:13:25 -0400 | [diff] [blame] | 1763 | } else p = load_library(file, head); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1764 | |
| 1765 | if (!p) { |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1766 | error(noload ? |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1767 | "Library %s is not already loaded" : |
| 1768 | "Error loading shared library %s: %m", |
| 1769 | file); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1770 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1771 | } |
| 1772 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1773 | /* First load handling */ |
Rich Felker | 43c423a | 2017-07-04 11:34:39 -0400 | [diff] [blame^] | 1774 | int first_load = !p->deps; |
| 1775 | if (first_load) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1776 | load_deps(p); |
Rich Felker | 0c53178 | 2017-03-21 08:35:59 -0400 | [diff] [blame] | 1777 | if (!p->relocated && (mode & RTLD_LAZY)) { |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1778 | prepare_lazy(p); |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 1779 | for (i=0; p->deps[i]; i++) |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1780 | if (!p->deps[i]->relocated) |
| 1781 | prepare_lazy(p->deps[i]); |
| 1782 | } |
Rich Felker | 43c423a | 2017-07-04 11:34:39 -0400 | [diff] [blame^] | 1783 | } |
| 1784 | if (first_load || (mode & RTLD_GLOBAL)) { |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1785 | /* Make new symbols global, at least temporarily, so we can do |
| 1786 | * relocations. If not RTLD_GLOBAL, this is reverted below. */ |
| 1787 | add_syms(p); |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 1788 | for (i=0; p->deps[i]; i++) |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1789 | add_syms(p->deps[i]); |
Rich Felker | 43c423a | 2017-07-04 11:34:39 -0400 | [diff] [blame^] | 1790 | } |
| 1791 | if (first_load) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1792 | reloc_all(p); |
| 1793 | } |
| 1794 | |
Rich Felker | 4ff234f | 2017-03-12 21:03:05 -0400 | [diff] [blame] | 1795 | /* If RTLD_GLOBAL was not specified, undo any new additions |
| 1796 | * to the global symbol table. This is a nop if the library was |
| 1797 | * previously loaded and already global. */ |
| 1798 | if (!(mode & RTLD_GLOBAL)) |
| 1799 | revert_syms(orig_syms_tail); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1800 | |
Rich Felker | 6476b81 | 2017-03-13 08:52:41 -0400 | [diff] [blame] | 1801 | /* Processing of deferred lazy relocations must not happen until |
| 1802 | * the new libraries are committed; otherwise we could end up with |
| 1803 | * relocations resolved to symbol definitions that get removed. */ |
| 1804 | redo_lazy_relocs(); |
| 1805 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1806 | update_tls_size(); |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1807 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1808 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1809 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1810 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1811 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1812 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1813 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1814 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1815 | return p; |
| 1816 | } |
| 1817 | |
Rich Felker | 891e654 | 2016-01-25 18:51:33 -0500 | [diff] [blame] | 1818 | __attribute__((__visibility__("hidden"))) |
| 1819 | int __dl_invalid_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1820 | { |
| 1821 | struct dso *p; |
| 1822 | for (p=head; p; p=p->next) if (h==p) return 0; |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1823 | error("Invalid library handle %p", (void *)h); |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1824 | return 1; |
| 1825 | } |
| 1826 | |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1827 | static void *addr2dso(size_t a) |
| 1828 | { |
| 1829 | struct dso *p; |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1830 | size_t i; |
| 1831 | if (DL_FDPIC) for (p=head; p; p=p->next) { |
| 1832 | i = count_syms(p); |
| 1833 | if (a-(size_t)p->funcdescs < i*sizeof(*p->funcdescs)) |
| 1834 | return p; |
| 1835 | } |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1836 | for (p=head; p; p=p->next) { |
| 1837 | if (DL_FDPIC && p->loadmap) { |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1838 | for (i=0; i<p->loadmap->nsegs; i++) { |
| 1839 | if (a-p->loadmap->segs[i].p_vaddr |
| 1840 | < p->loadmap->segs[i].p_memsz) |
| 1841 | return p; |
| 1842 | } |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1843 | } else { |
| 1844 | if (a-(size_t)p->map < p->map_len) |
| 1845 | return p; |
| 1846 | } |
| 1847 | } |
| 1848 | return 0; |
| 1849 | } |
| 1850 | |
rofl0r | 1f53e7d | 2017-01-13 10:28:46 +0000 | [diff] [blame] | 1851 | void *__tls_get_addr(tls_mod_off_t *); |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1852 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1853 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1854 | { |
| 1855 | size_t i; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1856 | uint32_t h = 0, gh = 0, *ght; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1857 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1858 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1859 | if (p == RTLD_DEFAULT) { |
| 1860 | p = head; |
| 1861 | } else if (p == RTLD_NEXT) { |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1862 | p = addr2dso((size_t)ra); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1863 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1864 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1865 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1866 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1867 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1868 | if ((def.sym->st_info&0xf) == STT_TLS) |
rofl0r | 1f53e7d | 2017-01-13 10:28:46 +0000 | [diff] [blame] | 1869 | return __tls_get_addr((tls_mod_off_t []){def.dso->tls_id, def.sym->st_value}); |
Rich Felker | d47d9a5 | 2015-09-22 22:48:21 +0000 | [diff] [blame] | 1870 | if (DL_FDPIC && (def.sym->st_info&0xf) == STT_FUNC) |
| 1871 | return def.dso->funcdescs + (def.sym - def.dso->syms); |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1872 | return laddr(def.dso, def.sym->st_value); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1873 | } |
Rich Felker | 891e654 | 2016-01-25 18:51:33 -0500 | [diff] [blame] | 1874 | if (__dl_invalid_handle(p)) |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1875 | return 0; |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1876 | if ((ght = p->ghashtab)) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1877 | gh = gnu_hash(s); |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1878 | sym = gnu_lookup(gh, ght, p, s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1879 | } else { |
| 1880 | h = sysv_hash(s); |
| 1881 | sym = sysv_lookup(s, h, p); |
| 1882 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1883 | if (sym && (sym->st_info&0xf) == STT_TLS) |
rofl0r | 1f53e7d | 2017-01-13 10:28:46 +0000 | [diff] [blame] | 1884 | return __tls_get_addr((tls_mod_off_t []){p->tls_id, sym->st_value}); |
Rich Felker | d47d9a5 | 2015-09-22 22:48:21 +0000 | [diff] [blame] | 1885 | if (DL_FDPIC && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC) |
| 1886 | return p->funcdescs + (sym - p->syms); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1887 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1888 | return laddr(p, sym->st_value); |
Rich Felker | 66b53cf | 2017-07-04 10:58:13 -0400 | [diff] [blame] | 1889 | for (i=0; p->deps[i]; i++) { |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1890 | if ((ght = p->deps[i]->ghashtab)) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1891 | if (!gh) gh = gnu_hash(s); |
Alexander Monakov | 8f08a58 | 2015-06-28 02:48:33 +0300 | [diff] [blame] | 1892 | sym = gnu_lookup(gh, ght, p->deps[i], s); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1893 | } else { |
| 1894 | if (!h) h = sysv_hash(s); |
| 1895 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1896 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1897 | if (sym && (sym->st_info&0xf) == STT_TLS) |
rofl0r | 1f53e7d | 2017-01-13 10:28:46 +0000 | [diff] [blame] | 1898 | return __tls_get_addr((tls_mod_off_t []){p->deps[i]->tls_id, sym->st_value}); |
Rich Felker | d47d9a5 | 2015-09-22 22:48:21 +0000 | [diff] [blame] | 1899 | if (DL_FDPIC && sym && sym->st_shndx && (sym->st_info&0xf) == STT_FUNC) |
| 1900 | return p->deps[i]->funcdescs + (sym - p->deps[i]->syms); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1901 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1902 | return laddr(p->deps[i], sym->st_value); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1903 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1904 | failed: |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 1905 | error("Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1906 | return 0; |
| 1907 | } |
| 1908 | |
Rich Felker | 4f8f038 | 2016-01-25 18:37:05 -0500 | [diff] [blame] | 1909 | int dladdr(const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1910 | { |
| 1911 | struct dso *p; |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1912 | Sym *sym, *bestsym; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1913 | uint32_t nsym; |
| 1914 | char *strings; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1915 | void *best = 0; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1916 | |
| 1917 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 6c5cad2 | 2015-09-22 23:41:41 +0000 | [diff] [blame] | 1918 | p = addr2dso((size_t)addr); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1919 | pthread_rwlock_unlock(&lock); |
| 1920 | |
| 1921 | if (!p) return 0; |
| 1922 | |
| 1923 | sym = p->syms; |
| 1924 | strings = p->strings; |
Rich Felker | 3958144 | 2015-09-21 21:47:50 +0000 | [diff] [blame] | 1925 | nsym = count_syms(p); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1926 | |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1927 | if (DL_FDPIC) { |
| 1928 | size_t idx = ((size_t)addr-(size_t)p->funcdescs) |
| 1929 | / sizeof(*p->funcdescs); |
| 1930 | if (idx < nsym && (sym[idx].st_info&0xf) == STT_FUNC) { |
| 1931 | best = p->funcdescs + idx; |
| 1932 | bestsym = sym + idx; |
| 1933 | } |
| 1934 | } |
| 1935 | |
| 1936 | if (!best) for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1937 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1938 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1939 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
Rich Felker | 301335a | 2015-09-17 17:18:09 +0000 | [diff] [blame] | 1940 | void *symaddr = laddr(p, sym->st_value); |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1941 | if (symaddr > addr || symaddr < best) |
| 1942 | continue; |
| 1943 | best = symaddr; |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1944 | bestsym = sym; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1945 | if (addr == symaddr) |
| 1946 | break; |
| 1947 | } |
| 1948 | } |
| 1949 | |
| 1950 | if (!best) return 0; |
| 1951 | |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1952 | if (DL_FDPIC && (bestsym->st_info&0xf) == STT_FUNC) |
| 1953 | best = p->funcdescs + (bestsym - p->syms); |
| 1954 | |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1955 | info->dli_fname = p->name; |
| 1956 | info->dli_fbase = p->base; |
Rich Felker | bde0b4b | 2015-10-15 22:51:56 -0400 | [diff] [blame] | 1957 | info->dli_sname = strings + bestsym->st_name; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1958 | info->dli_saddr = best; |
| 1959 | |
| 1960 | return 1; |
| 1961 | } |
| 1962 | |
Rich Felker | 72b25dd | 2015-04-14 11:39:11 -0400 | [diff] [blame] | 1963 | __attribute__((__visibility__("hidden"))) |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1964 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1965 | { |
| 1966 | void *res; |
| 1967 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1968 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1969 | pthread_rwlock_unlock(&lock); |
| 1970 | return res; |
| 1971 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1972 | |
| 1973 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1974 | { |
| 1975 | struct dso *current; |
| 1976 | struct dl_phdr_info info; |
| 1977 | int ret = 0; |
| 1978 | for(current = head; current;) { |
| 1979 | info.dlpi_addr = (uintptr_t)current->base; |
| 1980 | info.dlpi_name = current->name; |
| 1981 | info.dlpi_phdr = current->phdr; |
| 1982 | info.dlpi_phnum = current->phnum; |
| 1983 | info.dlpi_adds = gencnt; |
| 1984 | info.dlpi_subs = 0; |
| 1985 | info.dlpi_tls_modid = current->tls_id; |
Rich Felker | d56460c | 2015-11-12 15:50:26 -0500 | [diff] [blame] | 1986 | info.dlpi_tls_data = current->tls.image; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1987 | |
| 1988 | ret = (callback)(&info, sizeof (info), data); |
| 1989 | |
| 1990 | if (ret != 0) break; |
| 1991 | |
| 1992 | pthread_rwlock_rdlock(&lock); |
| 1993 | current = current->next; |
| 1994 | pthread_rwlock_unlock(&lock); |
| 1995 | } |
| 1996 | return ret; |
| 1997 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1998 | |
Rich Felker | 891e654 | 2016-01-25 18:51:33 -0500 | [diff] [blame] | 1999 | __attribute__((__visibility__("hidden"))) |
Rich Felker | a4fbc82 | 2016-01-25 17:56:00 -0500 | [diff] [blame] | 2000 | void __dl_vseterr(const char *, va_list); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 2001 | |
| 2002 | static void error(const char *fmt, ...) |
| 2003 | { |
| 2004 | va_list ap; |
| 2005 | va_start(ap, fmt); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 2006 | if (!runtime) { |
| 2007 | vdprintf(2, fmt, ap); |
| 2008 | dprintf(2, "\n"); |
| 2009 | ldso_fail = 1; |
| 2010 | va_end(ap); |
| 2011 | return; |
| 2012 | } |
Rich Felker | a4fbc82 | 2016-01-25 17:56:00 -0500 | [diff] [blame] | 2013 | __dl_vseterr(fmt, ap); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 2014 | va_end(ap); |
Rich Felker | 01d4274 | 2015-04-18 18:00:22 -0400 | [diff] [blame] | 2015 | } |