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 | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 22 | |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 23 | static int errflag; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 24 | static char errbuf[128]; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 25 | |
Rich Felker | e864a29 | 2012-07-11 01:47:30 -0400 | [diff] [blame] | 26 | #ifdef SHARED |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 27 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 28 | #if ULONG_MAX == 0xffffffff |
| 29 | typedef Elf32_Ehdr Ehdr; |
| 30 | typedef Elf32_Phdr Phdr; |
| 31 | typedef Elf32_Sym Sym; |
| 32 | #define R_TYPE(x) ((x)&255) |
| 33 | #define R_SYM(x) ((x)>>8) |
| 34 | #else |
| 35 | typedef Elf64_Ehdr Ehdr; |
| 36 | typedef Elf64_Phdr Phdr; |
| 37 | typedef Elf64_Sym Sym; |
| 38 | #define R_TYPE(x) ((x)&0xffffffff) |
| 39 | #define R_SYM(x) ((x)>>32) |
| 40 | #endif |
| 41 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 42 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 43 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 44 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 45 | struct debug { |
| 46 | int ver; |
| 47 | void *head; |
| 48 | void (*bp)(void); |
| 49 | int state; |
| 50 | void *base; |
| 51 | }; |
| 52 | |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 53 | struct td_index { |
| 54 | size_t args[2]; |
| 55 | struct td_index *next; |
| 56 | }; |
| 57 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 58 | struct dso { |
| 59 | unsigned char *base; |
| 60 | char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 61 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 62 | struct dso *next, *prev; |
| 63 | |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 64 | Phdr *phdr; |
| 65 | int phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 66 | size_t phentsize; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 67 | int refcnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 68 | Sym *syms; |
Rich Felker | 596d60c | 2011-06-18 22:52:01 -0400 | [diff] [blame] | 69 | uint32_t *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 70 | uint32_t *ghashtab; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 71 | int16_t *versym; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 72 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 73 | unsigned char *map; |
| 74 | size_t map_len; |
| 75 | dev_t dev; |
| 76 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 77 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 78 | char relocated; |
| 79 | char constructed; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 80 | char kernel_mapped; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 81 | struct dso **deps, *needed_by; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 82 | char *rpath_orig, *rpath; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 83 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 84 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 85 | size_t relro_start, relro_end; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 86 | void **new_dtv; |
| 87 | unsigned char *new_tls; |
Rich Felker | 56fbaa3 | 2015-03-03 22:50:02 -0500 | [diff] [blame] | 88 | volatile int new_dtv_idx, new_tls_idx; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 89 | struct td_index *td_index; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 90 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 91 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 92 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 93 | }; |
| 94 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 95 | struct symdef { |
| 96 | Sym *sym; |
| 97 | struct dso *dso; |
| 98 | }; |
| 99 | |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 100 | enum { |
| 101 | REL_ERR, |
| 102 | REL_SYMBOLIC, |
| 103 | REL_GOT, |
| 104 | REL_PLT, |
| 105 | REL_RELATIVE, |
| 106 | REL_OFFSET, |
| 107 | REL_OFFSET32, |
| 108 | REL_COPY, |
| 109 | REL_SYM_OR_REL, |
| 110 | REL_TLS, /* everything past here is TLS */ |
| 111 | REL_DTPMOD, |
| 112 | REL_DTPOFF, |
| 113 | REL_TPOFF, |
| 114 | REL_TPOFF_NEG, |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 115 | REL_TLSDESC, |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 116 | }; |
| 117 | |
Rich Felker | 59f4086 | 2012-08-05 13:46:39 -0400 | [diff] [blame] | 118 | #include "reloc.h" |
| 119 | |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 120 | int __init_tp(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 121 | void __init_libc(char **, char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 122 | |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 123 | const char *__libc_get_version(void); |
| 124 | |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame^] | 125 | static struct builtin_tls { |
| 126 | char c; |
| 127 | struct pthread pt; |
| 128 | void *space[16]; |
| 129 | } builtin_tls[1]; |
| 130 | #define MIN_TLS_ALIGN offsetof(struct builtin_tls, pt) |
| 131 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 132 | static struct dso *head, *tail, *ldso, *fini_head; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 133 | static char *env_path, *sys_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 134 | static unsigned long long gencnt; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 135 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 136 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 137 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 138 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 139 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 140 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 141 | static struct debug debug; |
Rich Felker | bd67959 | 2015-03-06 13:27:08 -0500 | [diff] [blame^] | 142 | static size_t tls_cnt, tls_offset, tls_align = MIN_TLS_ALIGN; |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 143 | static size_t static_tls_cnt; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 144 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 145 | |
| 146 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 147 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 148 | #define AUX_CNT 38 |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 149 | #define DYN_CNT 34 |
| 150 | |
| 151 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 152 | { |
| 153 | memset(a, 0, cnt*sizeof(size_t)); |
| 154 | for (; v[0]; v+=2) if (v[0]<cnt) { |
| 155 | a[0] |= 1ULL<<v[0]; |
| 156 | a[v[0]] = v[1]; |
| 157 | } |
| 158 | } |
| 159 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 160 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 161 | { |
| 162 | for (; v[0]!=key; v+=2) |
| 163 | if (!v[0]) return 0; |
| 164 | *r = v[1]; |
| 165 | return 1; |
| 166 | } |
| 167 | |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame] | 168 | static void error(const char *fmt, ...) |
| 169 | { |
| 170 | va_list ap; |
| 171 | va_start(ap, fmt); |
| 172 | vsnprintf(errbuf, sizeof errbuf, fmt, ap); |
| 173 | va_end(ap); |
| 174 | if (runtime) longjmp(*rtld_fail, 1); |
| 175 | dprintf(2, "%s\n", errbuf); |
| 176 | ldso_fail = 1; |
| 177 | } |
| 178 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 179 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 180 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 181 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 182 | uint_fast32_t h = 0; |
| 183 | while (*s) { |
| 184 | h = 16*h + *s++; |
| 185 | h ^= h>>24 & 0xf0; |
| 186 | } |
| 187 | return h & 0xfffffff; |
| 188 | } |
| 189 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 190 | static uint32_t gnu_hash(const char *s0) |
| 191 | { |
| 192 | const unsigned char *s = (void *)s0; |
| 193 | uint_fast32_t h = 5381; |
| 194 | for (; *s; s++) |
| 195 | h = h*33 + *s; |
| 196 | return h; |
| 197 | } |
| 198 | |
| 199 | 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] | 200 | { |
| 201 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 202 | Sym *syms = dso->syms; |
| 203 | uint32_t *hashtab = dso->hashtab; |
| 204 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 205 | 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] | 206 | if ((!dso->versym || dso->versym[i] >= 0) |
| 207 | && (!strcmp(s, strings+syms[i].st_name))) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 208 | return syms+i; |
| 209 | } |
| 210 | return 0; |
| 211 | } |
| 212 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 213 | static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso) |
| 214 | { |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 215 | Sym *syms = dso->syms; |
| 216 | char *strings = dso->strings; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 217 | uint32_t *hashtab = dso->ghashtab; |
| 218 | uint32_t nbuckets = hashtab[0]; |
| 219 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
| 220 | uint32_t h2; |
| 221 | uint32_t *hashval; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 222 | uint32_t i = buckets[h1 % nbuckets]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 223 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 224 | if (!i) return 0; |
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 | hashval = buckets + nbuckets + (i - hashtab[1]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 227 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 228 | for (h1 |= 1; ; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 229 | h2 = *hashval++; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 230 | if ((!dso->versym || dso->versym[i] >= 0) |
| 231 | && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name)) |
| 232 | return syms+i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 233 | if (h2 & 1) break; |
| 234 | } |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 239 | #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] | 240 | #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] | 241 | |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 242 | #ifndef ARCH_SYM_REJECT_UND |
| 243 | #define ARCH_SYM_REJECT_UND(s) 0 |
| 244 | #endif |
| 245 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 246 | 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] | 247 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 248 | uint32_t h = 0, gh = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 249 | struct symdef def = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 250 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 251 | Sym *sym; |
| 252 | if (!dso->global) continue; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 253 | if (dso->ghashtab) { |
| 254 | if (!gh) gh = gnu_hash(s); |
| 255 | sym = gnu_lookup(s, gh, dso); |
| 256 | } else { |
| 257 | if (!h) h = sysv_hash(s); |
| 258 | sym = sysv_lookup(s, h, dso); |
| 259 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 260 | if (!sym) continue; |
| 261 | if (!sym->st_shndx) |
Rich Felker | 2d8cc92 | 2014-06-30 01:18:14 -0400 | [diff] [blame] | 262 | if (need_def || (sym->st_info&0xf) == STT_TLS |
| 263 | || ARCH_SYM_REJECT_UND(sym)) |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 264 | continue; |
| 265 | if (!sym->st_value) |
| 266 | if ((sym->st_info&0xf) != STT_TLS) |
| 267 | continue; |
| 268 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 269 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
| 270 | |
| 271 | if (def.sym && sym->st_info>>4 == STB_WEAK) continue; |
| 272 | def.sym = sym; |
| 273 | def.dso = dso; |
| 274 | if (sym->st_info>>4 == STB_GLOBAL) break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 275 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 276 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 277 | } |
| 278 | |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 279 | #define NO_INLINE_ADDEND (1<<REL_COPY | 1<<REL_GOT | 1<<REL_PLT) |
| 280 | |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 281 | ptrdiff_t __tlsdesc_static(), __tlsdesc_dynamic(); |
| 282 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 283 | 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] | 284 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 285 | unsigned char *base = dso->base; |
| 286 | Sym *syms = dso->syms; |
| 287 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 288 | Sym *sym; |
| 289 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 290 | void *ctx; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 291 | int astype, type; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 292 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 293 | struct symdef def; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 294 | size_t *reloc_addr; |
| 295 | size_t sym_val; |
| 296 | size_t tls_val; |
| 297 | size_t addend; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 298 | |
| 299 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 300 | astype = R_TYPE(rel[1]); |
| 301 | if (!astype) continue; |
| 302 | type = remap_rel(astype); |
| 303 | if (!type) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 304 | error("Error relocating %s: unsupported relocation type %d", |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 305 | dso->name, astype); |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 306 | continue; |
| 307 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 308 | sym_index = R_SYM(rel[1]); |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 309 | reloc_addr = (void *)(base + rel[0]); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 310 | if (sym_index) { |
| 311 | sym = syms + sym_index; |
| 312 | name = strings + sym->st_name; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 313 | ctx = type==REL_COPY ? head->next : head; |
| 314 | def = find_sym(ctx, name, type==REL_PLT); |
Rich Felker | 69003e0 | 2014-01-21 00:36:35 -0500 | [diff] [blame] | 315 | if (!def.sym && (sym->st_shndx != SHN_UNDEF |
| 316 | || sym->st_info>>4 != STB_WEAK)) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 317 | error("Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 318 | dso->name, name); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 319 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 320 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 321 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 322 | sym = 0; |
| 323 | def.sym = 0; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 324 | def.dso = dso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 325 | } |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 326 | |
| 327 | addend = stride>2 ? rel[2] |
| 328 | : (1<<type & NO_INLINE_ADDEND) ? 0 |
| 329 | : *reloc_addr; |
| 330 | |
| 331 | sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0; |
| 332 | tls_val = def.sym ? def.sym->st_value : 0; |
| 333 | |
| 334 | switch(type) { |
| 335 | case REL_OFFSET: |
| 336 | addend -= (size_t)reloc_addr; |
| 337 | case REL_SYMBOLIC: |
| 338 | case REL_GOT: |
| 339 | case REL_PLT: |
| 340 | *reloc_addr = sym_val + addend; |
| 341 | break; |
| 342 | case REL_RELATIVE: |
| 343 | *reloc_addr = (size_t)base + addend; |
| 344 | break; |
| 345 | case REL_SYM_OR_REL: |
| 346 | if (sym) *reloc_addr = sym_val + addend; |
| 347 | else *reloc_addr = (size_t)base + addend; |
| 348 | break; |
| 349 | case REL_COPY: |
| 350 | memcpy(reloc_addr, (void *)sym_val, sym->st_size); |
| 351 | break; |
| 352 | case REL_OFFSET32: |
| 353 | *(uint32_t *)reloc_addr = sym_val + addend |
| 354 | - (size_t)reloc_addr; |
| 355 | break; |
| 356 | case REL_DTPMOD: |
| 357 | *reloc_addr = def.dso->tls_id; |
| 358 | break; |
| 359 | case REL_DTPOFF: |
| 360 | *reloc_addr = tls_val + addend; |
| 361 | break; |
| 362 | #ifdef TLS_ABOVE_TP |
| 363 | case REL_TPOFF: |
| 364 | *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend; |
| 365 | break; |
| 366 | #else |
| 367 | case REL_TPOFF: |
| 368 | *reloc_addr = tls_val - def.dso->tls_offset + addend; |
| 369 | break; |
| 370 | case REL_TPOFF_NEG: |
| 371 | *reloc_addr = def.dso->tls_offset - tls_val + addend; |
| 372 | break; |
| 373 | #endif |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 374 | case REL_TLSDESC: |
| 375 | if (stride<3) addend = reloc_addr[1]; |
| 376 | if (runtime && def.dso->tls_id >= static_tls_cnt) { |
| 377 | struct td_index *new = malloc(sizeof *new); |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 378 | if (!new) error( |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 379 | "Error relocating %s: cannot allocate TLSDESC for %s", |
| 380 | dso->name, sym ? name : "(local)" ); |
| 381 | new->next = dso->td_index; |
| 382 | dso->td_index = new; |
| 383 | new->args[0] = def.dso->tls_id; |
| 384 | new->args[1] = tls_val + addend; |
| 385 | reloc_addr[0] = (size_t)__tlsdesc_dynamic; |
| 386 | reloc_addr[1] = (size_t)new; |
| 387 | } else { |
| 388 | reloc_addr[0] = (size_t)__tlsdesc_static; |
| 389 | #ifdef TLS_ABOVE_TP |
| 390 | reloc_addr[1] = tls_val + def.dso->tls_offset |
| 391 | + TPOFF_K + addend; |
| 392 | #else |
| 393 | reloc_addr[1] = tls_val - def.dso->tls_offset |
| 394 | + addend; |
| 395 | #endif |
| 396 | } |
| 397 | break; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 398 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 399 | } |
| 400 | } |
| 401 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 402 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 403 | * needing at least a page of dirty memory even if they have no global |
| 404 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 405 | * and "donate" them to the heap by setting up minimal malloc |
| 406 | * structures and then freeing them. */ |
| 407 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 408 | static void reclaim(struct dso *dso, size_t start, size_t end) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 409 | { |
| 410 | size_t *a, *z; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 411 | if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end; |
| 412 | if (end >= dso->relro_start && end < dso->relro_end) end = dso->relro_start; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 413 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 414 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 415 | if (start>end || end-start < 4*sizeof(size_t)) return; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 416 | a = (size_t *)(dso->base + start); |
| 417 | z = (size_t *)(dso->base + end); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 418 | a[-2] = 1; |
| 419 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 420 | z[1] = 1; |
| 421 | free(a); |
| 422 | } |
| 423 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 424 | static void reclaim_gaps(struct dso *dso) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 425 | { |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 426 | Phdr *ph = dso->phdr; |
| 427 | size_t phcnt = dso->phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 428 | |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 429 | for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) { |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 430 | if (ph->p_type!=PT_LOAD) continue; |
| 431 | 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] | 432 | reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 433 | reclaim(dso, ph->p_vaddr+ph->p_memsz, |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 434 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 435 | } |
| 436 | } |
| 437 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 438 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 439 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 440 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 441 | void *allocated_buf=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 442 | size_t phsize; |
| 443 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 444 | size_t this_min, this_max; |
| 445 | off_t off_start; |
| 446 | Ehdr *eh; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 447 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 448 | unsigned prot; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 449 | unsigned char *map=MAP_FAILED, *base; |
Rich Felker | 7443dd2 | 2013-08-02 09:25:12 -0400 | [diff] [blame] | 450 | size_t dyn=0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 451 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 452 | size_t i; |
| 453 | |
| 454 | ssize_t l = read(fd, buf, sizeof buf); |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 455 | eh = buf; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 456 | if (l<0) return 0; |
| 457 | if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) |
| 458 | goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 459 | phsize = eh->e_phentsize * eh->e_phnum; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 460 | if (phsize > sizeof buf - sizeof *eh) { |
| 461 | allocated_buf = malloc(phsize); |
| 462 | if (!allocated_buf) return 0; |
| 463 | l = pread(fd, allocated_buf, phsize, eh->e_phoff); |
| 464 | if (l < 0) goto error; |
| 465 | if (l != phsize) goto noexec; |
| 466 | ph = ph0 = allocated_buf; |
| 467 | } else if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 468 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 469 | if (l < 0) goto error; |
| 470 | if (l != phsize) goto noexec; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 471 | ph = ph0 = (void *)(buf + 1); |
| 472 | } else { |
| 473 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 474 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 475 | 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] | 476 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 477 | dyn = ph->p_vaddr; |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 478 | } else if (ph->p_type == PT_TLS) { |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 479 | tls_image = ph->p_vaddr; |
| 480 | dso->tls_align = ph->p_align; |
| 481 | dso->tls_len = ph->p_filesz; |
| 482 | dso->tls_size = ph->p_memsz; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 483 | } else if (ph->p_type == PT_GNU_RELRO) { |
| 484 | dso->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 485 | dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 486 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 487 | if (ph->p_type != PT_LOAD) continue; |
| 488 | if (ph->p_vaddr < addr_min) { |
| 489 | addr_min = ph->p_vaddr; |
| 490 | off_start = ph->p_offset; |
| 491 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 492 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 493 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 494 | } |
| 495 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 496 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 497 | } |
| 498 | } |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 499 | if (!dyn) goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 500 | addr_max += PAGE_SIZE-1; |
| 501 | addr_max &= -PAGE_SIZE; |
| 502 | addr_min &= -PAGE_SIZE; |
| 503 | off_start &= -PAGE_SIZE; |
| 504 | map_len = addr_max - addr_min + off_start; |
| 505 | /* The first time, we map too much, possibly even more than |
| 506 | * the length of the file. This is okay because we will not |
| 507 | * use the invalid part; we just need to reserve the right |
| 508 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 509 | map = mmap((void *)addr_min, map_len, prot, MAP_PRIVATE, fd, off_start); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 510 | if (map==MAP_FAILED) goto error; |
Rich Felker | 339516a | 2013-07-31 14:42:08 -0400 | [diff] [blame] | 511 | /* If the loaded file is not relocatable and the requested address is |
| 512 | * not available, then the load operation must fail. */ |
| 513 | if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { |
| 514 | errno = EBUSY; |
| 515 | goto error; |
| 516 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 517 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 518 | dso->phdr = 0; |
| 519 | dso->phnum = 0; |
| 520 | for (ph=ph0, i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 521 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 522 | /* Check if the programs headers are in this load segment, and |
| 523 | * if so, record the address for use by dl_iterate_phdr. */ |
| 524 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 525 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 526 | dso->phdr = (void *)(base + ph->p_vaddr |
| 527 | + (eh->e_phoff-ph->p_offset)); |
| 528 | dso->phnum = eh->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 529 | dso->phentsize = eh->e_phentsize; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 530 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 531 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 532 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 533 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 534 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 535 | off_start = ph->p_offset & -PAGE_SIZE; |
| 536 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 537 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 538 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 539 | if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
| 540 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 541 | if (ph->p_memsz > ph->p_filesz) { |
| 542 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 543 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 544 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 545 | if (pgbrk-(size_t)base < this_max && mmap((void *)pgbrk, (size_t)base+this_max-pgbrk, prot, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) == MAP_FAILED) |
| 546 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 547 | } |
| 548 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 549 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 550 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 551 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0) |
| 552 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 553 | break; |
| 554 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 555 | dso->map = map; |
| 556 | dso->map_len = map_len; |
| 557 | dso->base = base; |
| 558 | dso->dynv = (void *)(base+dyn); |
| 559 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 560 | if (!runtime) reclaim_gaps(dso); |
Rich Felker | 8d01dfc | 2013-08-02 09:59:02 -0400 | [diff] [blame] | 561 | free(allocated_buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 562 | return map; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 563 | noexec: |
| 564 | errno = ENOEXEC; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 565 | error: |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 566 | if (map!=MAP_FAILED) munmap(map, map_len); |
| 567 | free(allocated_buf); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 568 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 569 | } |
| 570 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 571 | 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] | 572 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 573 | size_t l; |
| 574 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 575 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 576 | s += strspn(s, ":\n"); |
| 577 | l = strcspn(s, ":\n"); |
| 578 | if (l-1 >= INT_MAX) return -1; |
| 579 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size) |
| 580 | continue; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 581 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 582 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 583 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 584 | } |
| 585 | |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 586 | static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) |
| 587 | { |
| 588 | size_t n, l; |
| 589 | const char *s, *t, *origin; |
| 590 | char *d; |
| 591 | if (p->rpath) return 0; |
| 592 | if (!p->rpath_orig) return -1; |
| 593 | if (!strchr(p->rpath_orig, '$')) { |
| 594 | p->rpath = p->rpath_orig; |
| 595 | return 0; |
| 596 | } |
| 597 | n = 0; |
| 598 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 599 | while ((t=strchr(s, '$'))) { |
| 600 | if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) |
| 601 | return -1; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 602 | s = t+1; |
| 603 | n++; |
| 604 | } |
| 605 | if (n > SSIZE_MAX/PATH_MAX) return -1; |
| 606 | |
| 607 | if (p->kernel_mapped) { |
| 608 | /* $ORIGIN searches cannot be performed for the main program |
| 609 | * when it is suid/sgid/AT_SECURE. This is because the |
| 610 | * pathname is under the control of the caller of execve. |
| 611 | * For libraries, however, $ORIGIN can be processed safely |
| 612 | * since the library's pathname came from a trusted source |
| 613 | * (either system paths or a call to dlopen). */ |
| 614 | if (libc.secure) |
| 615 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 616 | l = readlink("/proc/self/exe", buf, buf_size); |
| 617 | if (l >= buf_size) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 618 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 619 | buf[l] = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 620 | origin = buf; |
| 621 | } else { |
| 622 | origin = p->name; |
| 623 | } |
| 624 | t = strrchr(origin, '/'); |
| 625 | l = t ? t-origin : 0; |
| 626 | p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); |
| 627 | if (!p->rpath) return -1; |
| 628 | |
| 629 | d = p->rpath; |
| 630 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 631 | while ((t=strchr(s, '$'))) { |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 632 | memcpy(d, s, t-s); |
| 633 | d += t-s; |
| 634 | memcpy(d, origin, l); |
| 635 | d += l; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 636 | /* It was determined previously that the '$' is followed |
| 637 | * either by "ORIGIN" or "{ORIGIN}". */ |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 638 | s = t + 7 + 2*(t[1]=='{'); |
| 639 | } |
| 640 | strcpy(d, s); |
| 641 | return 0; |
| 642 | } |
| 643 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 644 | static void decode_dyn(struct dso *p) |
| 645 | { |
| 646 | size_t dyn[DYN_CNT] = {0}; |
| 647 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 648 | p->syms = (void *)(p->base + dyn[DT_SYMTAB]); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 649 | p->strings = (void *)(p->base + dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 650 | if (dyn[0]&(1<<DT_HASH)) |
| 651 | p->hashtab = (void *)(p->base + dyn[DT_HASH]); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 652 | if (dyn[0]&(1<<DT_RPATH)) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 653 | p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]); |
Rich Felker | d8dc2b7 | 2014-11-23 16:17:57 -0500 | [diff] [blame] | 654 | if (dyn[0]&(1<<DT_RUNPATH)) |
| 655 | p->rpath_orig = (void *)(p->strings + dyn[DT_RUNPATH]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 656 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
| 657 | p->ghashtab = (void *)(p->base + *dyn); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 658 | if (search_vec(p->dynv, dyn, DT_VERSYM)) |
| 659 | p->versym = (void *)(p->base + *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 660 | } |
| 661 | |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 662 | static struct dso *load_library(const char *name, struct dso *needed_by) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 663 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 664 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 665 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 666 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 667 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 668 | int fd; |
| 669 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 670 | size_t alloc_size; |
| 671 | int n_th = 0; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 672 | int is_self = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 673 | |
Rich Felker | 5954931 | 2014-07-11 00:29:44 -0400 | [diff] [blame] | 674 | if (!*name) { |
| 675 | errno = EINVAL; |
| 676 | return 0; |
| 677 | } |
| 678 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 679 | /* Catch and block attempts to reload the implementation itself */ |
| 680 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 681 | static const char *rp, reserved[] = |
| 682 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 683 | char *z = strchr(name, '.'); |
| 684 | if (z) { |
| 685 | size_t l = z-name; |
Rich Felker | 27593d3 | 2013-07-31 15:14:06 -0400 | [diff] [blame] | 686 | for (rp=reserved; *rp && strncmp(name+3, rp, l-3); rp+=strlen(rp)+1); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 687 | if (*rp) { |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 688 | if (ldd_mode) { |
| 689 | /* Track which names have been resolved |
| 690 | * and only report each one once. */ |
| 691 | static unsigned reported; |
| 692 | unsigned mask = 1U<<(rp-reserved); |
| 693 | if (!(reported & mask)) { |
| 694 | reported |= mask; |
| 695 | dprintf(1, "\t%s => %s (%p)\n", |
| 696 | name, ldso->name, |
| 697 | ldso->base); |
| 698 | } |
| 699 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 700 | is_self = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 701 | } |
| 702 | } |
| 703 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 704 | if (!strcmp(name, ldso->name)) is_self = 1; |
| 705 | if (is_self) { |
| 706 | if (!ldso->prev) { |
| 707 | tail->next = ldso; |
| 708 | ldso->prev = tail; |
| 709 | tail = ldso->next ? ldso->next : ldso; |
| 710 | } |
| 711 | return ldso; |
| 712 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 713 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 714 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 715 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 716 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 717 | /* Search for the name to see if it's already loaded */ |
| 718 | for (p=head->next; p; p=p->next) { |
| 719 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 720 | p->refcnt++; |
| 721 | return p; |
| 722 | } |
| 723 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 724 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 725 | fd = -1; |
Rich Felker | 3e3753c | 2013-08-02 10:02:29 -0400 | [diff] [blame] | 726 | if (env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 727 | for (p=needed_by; fd < 0 && p; p=p->needed_by) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 728 | if (!fixup_rpath(p, buf, sizeof buf)) |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 729 | fd = path_open(name, p->rpath, buf, sizeof buf); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 730 | if (fd < 0) { |
| 731 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 732 | char *prefix = 0; |
| 733 | size_t prefix_len; |
| 734 | if (ldso->name[0]=='/') { |
| 735 | char *s, *t, *z; |
| 736 | for (s=t=z=ldso->name; *s; s++) |
| 737 | if (*s=='/') z=t, t=s; |
| 738 | prefix_len = z-ldso->name; |
| 739 | if (prefix_len < PATH_MAX) |
| 740 | prefix = ldso->name; |
| 741 | } |
| 742 | if (!prefix) { |
| 743 | prefix = ""; |
| 744 | prefix_len = 0; |
| 745 | } |
| 746 | char etc_ldso_path[prefix_len + 1 |
| 747 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 748 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 749 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 750 | (int)prefix_len, prefix); |
| 751 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 752 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 753 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 754 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 755 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 756 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 757 | fclose(f); |
Rich Felker | ff4be70 | 2013-09-09 13:39:08 -0400 | [diff] [blame] | 758 | } else if (errno != ENOENT) { |
| 759 | sys_path = ""; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 760 | } |
| 761 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 762 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 763 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 764 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 765 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 766 | } |
| 767 | if (fd < 0) return 0; |
| 768 | if (fstat(fd, &st) < 0) { |
| 769 | close(fd); |
| 770 | return 0; |
| 771 | } |
| 772 | for (p=head->next; p; p=p->next) { |
| 773 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 774 | /* If this library was previously loaded with a |
| 775 | * pathname but a search found the same inode, |
| 776 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 777 | if (!p->shortname && pathname != name) |
| 778 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 779 | close(fd); |
| 780 | p->refcnt++; |
| 781 | return p; |
| 782 | } |
| 783 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 784 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 785 | close(fd); |
| 786 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 787 | |
| 788 | /* Allocate storage for the new DSO. When there is TLS, this |
| 789 | * storage must include a reservation for all pre-existing |
| 790 | * threads to obtain copies of both the new TLS, and an |
| 791 | * extended DTV capable of storing an additional slot for |
| 792 | * the newly-loaded DSO. */ |
| 793 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 794 | if (runtime && temp_dso.tls_image) { |
| 795 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 796 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 797 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 798 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 799 | else alloc_size += n_th * per_th; |
| 800 | } |
| 801 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 802 | if (!p) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 803 | munmap(map, temp_dso.map_len); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 804 | return 0; |
| 805 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 806 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 807 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 808 | p->dev = st.st_dev; |
| 809 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 810 | p->refcnt = 1; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 811 | p->needed_by = needed_by; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 812 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 813 | strcpy(p->name, pathname); |
| 814 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 815 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 816 | if (p->tls_image) { |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 817 | if (runtime && !libc.has_thread_pointer) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 818 | munmap(map, p->map_len); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 819 | free(p); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 820 | errno = ENOSYS; |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 821 | return 0; |
| 822 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 823 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 824 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 825 | #ifdef TLS_ABOVE_TP |
| 826 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 827 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 828 | tls_offset += p->tls_size; |
| 829 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 830 | tls_offset += p->tls_size + p->tls_align - 1; |
| 831 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 832 | & (p->tls_align-1); |
| 833 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 834 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 835 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 836 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 837 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 838 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 839 | |
| 840 | tail->next = p; |
| 841 | p->prev = tail; |
| 842 | tail = p; |
| 843 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 844 | 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] | 845 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 846 | return p; |
| 847 | } |
| 848 | |
| 849 | static void load_deps(struct dso *p) |
| 850 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 851 | size_t i, ndeps=0; |
| 852 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 853 | for (; p; p=p->next) { |
| 854 | for (i=0; p->dynv[i]; i+=2) { |
| 855 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 856 | dep = load_library(p->strings + p->dynv[i+1], p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 857 | if (!dep) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 858 | error("Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 859 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 860 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 861 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 862 | if (runtime) { |
| 863 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 864 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 865 | tmp[ndeps++] = dep; |
| 866 | tmp[ndeps] = 0; |
| 867 | *deps = tmp; |
| 868 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 869 | } |
| 870 | } |
| 871 | } |
| 872 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 873 | static void load_preload(char *s) |
| 874 | { |
| 875 | int tmp; |
| 876 | char *z; |
| 877 | for (z=s; *z; s=z) { |
Rich Felker | 349381a | 2014-07-11 00:26:12 -0400 | [diff] [blame] | 878 | for ( ; *s && (isspace(*s) || *s==':'); s++); |
| 879 | for (z=s; *z && !isspace(*z) && *z!=':'; z++); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 880 | tmp = *z; |
| 881 | *z = 0; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 882 | load_library(s, 0); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 883 | *z = tmp; |
| 884 | } |
| 885 | } |
| 886 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 887 | static void make_global(struct dso *p) |
| 888 | { |
| 889 | for (; p; p=p->next) p->global = 1; |
| 890 | } |
| 891 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 892 | static void reloc_all(struct dso *p) |
| 893 | { |
| 894 | size_t dyn[DYN_CNT] = {0}; |
| 895 | for (; p; p=p->next) { |
| 896 | if (p->relocated) continue; |
| 897 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | babf820 | 2012-08-05 12:50:26 -0400 | [diff] [blame] | 898 | #ifdef NEED_ARCH_RELOCS |
| 899 | do_arch_relocs(p, head); |
| 900 | #endif |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 901 | do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
| 902 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
| 903 | do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 904 | do_relocs(p, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], 3); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 905 | |
| 906 | if (p->relro_start != p->relro_end && |
| 907 | mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) { |
Rich Felker | 9a4ad02 | 2014-06-29 21:52:54 -0400 | [diff] [blame] | 908 | error("Error relocating %s: RELRO protection failed: %m", |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 909 | p->name); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 910 | } |
| 911 | |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 912 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 913 | } |
| 914 | } |
| 915 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 916 | static void kernel_mapped_dso(struct dso *p) |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 917 | { |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 918 | size_t min_addr = -1, max_addr = 0, cnt; |
| 919 | Phdr *ph = p->phdr; |
| 920 | for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { |
| 921 | if (ph->p_type == PT_DYNAMIC) { |
| 922 | p->dynv = (void *)(p->base + ph->p_vaddr); |
| 923 | } else if (ph->p_type == PT_GNU_RELRO) { |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 924 | p->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 925 | p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
| 926 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 927 | if (ph->p_type != PT_LOAD) continue; |
| 928 | if (ph->p_vaddr < min_addr) |
| 929 | min_addr = ph->p_vaddr; |
| 930 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 931 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 932 | } |
| 933 | min_addr &= -PAGE_SIZE; |
| 934 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 935 | p->map = p->base + min_addr; |
| 936 | p->map_len = max_addr - min_addr; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 937 | p->kernel_mapped = 1; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 938 | } |
| 939 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 940 | static void do_fini() |
| 941 | { |
| 942 | struct dso *p; |
| 943 | size_t dyn[DYN_CNT] = {0}; |
| 944 | for (p=fini_head; p; p=p->fini_next) { |
| 945 | if (!p->constructed) continue; |
| 946 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 947 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 948 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 949 | size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n; |
| 950 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 951 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 952 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 953 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 954 | ((void (*)(void))(p->base + dyn[DT_FINI]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 955 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 956 | } |
| 957 | } |
| 958 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 959 | static void do_init_fini(struct dso *p) |
| 960 | { |
| 961 | size_t dyn[DYN_CNT] = {0}; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 962 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 963 | /* Allow recursive calls that arise when a library calls |
| 964 | * dlopen from one of its constructors, but block any |
| 965 | * other threads until all ctors have finished. */ |
| 966 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 967 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 968 | if (p->constructed) continue; |
| 969 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 970 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 971 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 972 | p->fini_next = fini_head; |
| 973 | fini_head = p; |
| 974 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 975 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 976 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 977 | ((void (*)(void))(p->base + dyn[DT_INIT]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 978 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 979 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 980 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
| 981 | size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]); |
| 982 | while (n--) ((void (*)(void))*fn++)(); |
| 983 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 984 | if (!need_locking && libc.threads_minus_1) { |
| 985 | need_locking = 1; |
| 986 | pthread_mutex_lock(&init_fini_lock); |
| 987 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 988 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 989 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 990 | } |
| 991 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 992 | void _dl_debug_state(void) |
| 993 | { |
| 994 | } |
| 995 | |
Rich Felker | 7c6c290 | 2013-08-03 16:27:30 -0400 | [diff] [blame] | 996 | void __reset_tls() |
| 997 | { |
| 998 | pthread_t self = __pthread_self(); |
| 999 | struct dso *p; |
| 1000 | for (p=head; p; p=p->next) { |
| 1001 | if (!p->tls_id || !self->dtv[p->tls_id]) continue; |
| 1002 | memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len); |
| 1003 | memset((char *)self->dtv[p->tls_id]+p->tls_len, 0, |
| 1004 | p->tls_size - p->tls_len); |
| 1005 | if (p->tls_id == (size_t)self->dtv[0]) break; |
| 1006 | } |
| 1007 | } |
| 1008 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1009 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1010 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1011 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1012 | struct dso *p; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1013 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1014 | void **dtv = (void *)mem; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1015 | dtv[0] = (void *)tls_cnt; |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1016 | if (!tls_cnt) { |
| 1017 | td = (void *)(dtv+1); |
| 1018 | td->dtv = dtv; |
| 1019 | return td; |
| 1020 | } |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1021 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1022 | #ifdef TLS_ABOVE_TP |
| 1023 | mem += sizeof(void *) * (tls_cnt+1); |
| 1024 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 1025 | td = (pthread_t)mem; |
| 1026 | mem += sizeof(struct pthread); |
| 1027 | |
| 1028 | for (p=head; p; p=p->next) { |
| 1029 | if (!p->tls_id) continue; |
| 1030 | dtv[p->tls_id] = mem + p->tls_offset; |
| 1031 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 1032 | } |
| 1033 | #else |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1034 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1035 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1036 | td = (pthread_t)mem; |
| 1037 | |
| 1038 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1039 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1040 | dtv[p->tls_id] = mem - p->tls_offset; |
| 1041 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1042 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1043 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1044 | td->dtv = dtv; |
| 1045 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1046 | } |
| 1047 | |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1048 | void *__tls_get_new(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1049 | { |
| 1050 | pthread_t self = __pthread_self(); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1051 | |
| 1052 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 1053 | sigset_t set; |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1054 | __block_all_sigs(&set); |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1055 | if (v[0]<=(size_t)self->dtv[0]) { |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1056 | __restore_sigs(&set); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1057 | return (char *)self->dtv[v[0]]+v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1058 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1059 | |
| 1060 | /* This is safe without any locks held because, if the caller |
| 1061 | * is able to request the Nth entry of the DTV, the DSO list |
| 1062 | * must be valid at least that far out and it was synchronized |
| 1063 | * at program startup or by an already-completed call to dlopen. */ |
| 1064 | struct dso *p; |
| 1065 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 1066 | |
| 1067 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1068 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1069 | void **newdtv = p->new_dtv + |
| 1070 | (v[0]+1)*sizeof(void *)*a_fetch_add(&p->new_dtv_idx,1); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1071 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1072 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 1073 | newdtv[0] = (void *)v[0]; |
| 1074 | self->dtv = newdtv; |
| 1075 | } |
| 1076 | |
Rich Felker | e75b16c | 2014-06-19 02:16:57 -0400 | [diff] [blame] | 1077 | /* Get new TLS memory from all new DSOs up to the requested one */ |
| 1078 | unsigned char *mem; |
| 1079 | for (p=head; ; p=p->next) { |
| 1080 | if (!p->tls_id || self->dtv[p->tls_id]) continue; |
| 1081 | mem = p->new_tls + (p->tls_size + p->tls_align) |
| 1082 | * a_fetch_add(&p->new_tls_idx,1); |
| 1083 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) |
| 1084 | & (p->tls_align-1); |
| 1085 | self->dtv[p->tls_id] = mem; |
| 1086 | memcpy(mem, p->tls_image, p->tls_len); |
| 1087 | if (p->tls_id == v[0]) break; |
| 1088 | } |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1089 | __restore_sigs(&set); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1090 | return mem + v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1091 | } |
| 1092 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1093 | static void update_tls_size() |
| 1094 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1095 | libc.tls_size = ALIGN( |
| 1096 | (1+tls_cnt) * sizeof(void *) + |
| 1097 | tls_offset + |
| 1098 | sizeof(struct pthread) + |
| 1099 | tls_align * 2, |
| 1100 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1101 | } |
| 1102 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1103 | void *__dynlink(int argc, char **argv) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1104 | { |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 1105 | size_t aux[AUX_CNT] = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1106 | size_t i; |
| 1107 | Phdr *phdr; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1108 | Ehdr *ehdr; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1109 | static struct dso builtin_dsos[3]; |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1110 | struct dso *const app = builtin_dsos+0; |
| 1111 | struct dso *const lib = builtin_dsos+1; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1112 | struct dso *const vdso = builtin_dsos+2; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1113 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1114 | size_t vdso_base; |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 1115 | size_t *auxv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1116 | char **envp = argv+argc+1; |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1117 | void *initial_tls; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1118 | |
| 1119 | /* Find aux vector just past environ[] */ |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1120 | for (i=argc+1; argv[i]; i++) |
| 1121 | if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16)) |
| 1122 | env_path = argv[i]+16; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1123 | else if (!memcmp(argv[i], "LD_PRELOAD=", 11)) |
| 1124 | env_preload = argv[i]+11; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1125 | auxv = (void *)(argv+i+1); |
| 1126 | |
| 1127 | decode_vec(auxv, aux, AUX_CNT); |
| 1128 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1129 | /* Only trust user/env if kernel says we're not suid/sgid */ |
| 1130 | if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
Rich Felker | a045883 | 2011-08-16 07:46:42 -0400 | [diff] [blame] | 1131 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1132 | env_path = 0; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1133 | env_preload = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 1134 | libc.secure = 1; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1135 | } |
Szabolcs Nagy | b20760c | 2013-09-15 02:00:32 +0000 | [diff] [blame] | 1136 | libc.page_size = aux[AT_PAGESZ]; |
Rich Felker | d8bdc97 | 2014-11-19 00:34:29 -0500 | [diff] [blame] | 1137 | libc.auxv = auxv; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1138 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1139 | /* If the dynamic linker was invoked as a program itself, AT_BASE |
| 1140 | * will not be set. In that case, we assume the base address is |
| 1141 | * the start of the page containing the PHDRs; I don't know any |
| 1142 | * better approach... */ |
| 1143 | if (!aux[AT_BASE]) { |
| 1144 | aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE; |
| 1145 | aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0; |
| 1146 | } |
| 1147 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1148 | /* The dynamic linker load address is passed by the kernel |
| 1149 | * in the AUX vector, so this is easy. */ |
| 1150 | lib->base = (void *)aux[AT_BASE]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1151 | lib->name = lib->shortname = "libc.so"; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1152 | lib->global = 1; |
| 1153 | ehdr = (void *)lib->base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1154 | lib->phnum = ehdr->e_phnum; |
| 1155 | lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1156 | lib->phentsize = ehdr->e_phentsize; |
| 1157 | kernel_mapped_dso(lib); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1158 | decode_dyn(lib); |
| 1159 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1160 | if (aux[AT_PHDR]) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1161 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1162 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1163 | /* Find load address of the main program, via AT_PHDR vs PT_PHDR. */ |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1164 | app->phdr = phdr = (void *)aux[AT_PHDR]; |
| 1165 | app->phnum = aux[AT_PHNUM]; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1166 | app->phentsize = aux[AT_PHENT]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1167 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 1168 | if (phdr->p_type == PT_PHDR) |
| 1169 | app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1170 | else if (phdr->p_type == PT_INTERP) |
| 1171 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1172 | else if (phdr->p_type == PT_TLS) { |
| 1173 | tls_image = phdr->p_vaddr; |
| 1174 | app->tls_len = phdr->p_filesz; |
| 1175 | app->tls_size = phdr->p_memsz; |
| 1176 | app->tls_align = phdr->p_align; |
| 1177 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1178 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1179 | if (app->tls_size) app->tls_image = (char *)app->base + tls_image; |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1180 | if (interp_off) lib->name = (char *)app->base + interp_off; |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1181 | if ((aux[0] & (1UL<<AT_EXECFN)) |
| 1182 | && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) |
| 1183 | app->name = (char *)aux[AT_EXECFN]; |
| 1184 | else |
| 1185 | app->name = argv[0]; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1186 | kernel_mapped_dso(app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1187 | } else { |
| 1188 | int fd; |
| 1189 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 1190 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1191 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
| 1192 | *argv++ = (void *)-1; |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1193 | while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') { |
| 1194 | char *opt = argv[0]+2; |
| 1195 | *argv++ = (void *)-1; |
| 1196 | if (!*opt) { |
| 1197 | break; |
| 1198 | } else if (!memcmp(opt, "list", 5)) { |
| 1199 | ldd_mode = 1; |
| 1200 | } else if (!memcmp(opt, "library-path", 12)) { |
| 1201 | if (opt[12]=='=') env_path = opt+13; |
| 1202 | else if (opt[12]) *argv = 0; |
| 1203 | else if (*argv) env_path = *argv++; |
| 1204 | } else if (!memcmp(opt, "preload", 7)) { |
| 1205 | if (opt[7]=='=') env_preload = opt+8; |
| 1206 | else if (opt[7]) *argv = 0; |
| 1207 | else if (*argv) env_preload = *argv++; |
| 1208 | } else { |
| 1209 | argv[0] = 0; |
| 1210 | } |
| 1211 | argv[-1] = (void *)-1; |
| 1212 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1213 | if (!argv[0]) { |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1214 | dprintf(2, "musl libc\n" |
| 1215 | "Version %s\n" |
| 1216 | "Dynamic Program Loader\n" |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1217 | "Usage: %s [options] [--] pathname%s\n", |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1218 | __libc_get_version(), ldname, |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1219 | ldd_mode ? "" : " [args]"); |
| 1220 | _exit(1); |
| 1221 | } |
| 1222 | fd = open(argv[0], O_RDONLY); |
| 1223 | if (fd < 0) { |
| 1224 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 1225 | _exit(1); |
| 1226 | } |
| 1227 | runtime = 1; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1228 | ehdr = (void *)map_library(fd, app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1229 | if (!ehdr) { |
| 1230 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 1231 | _exit(1); |
| 1232 | } |
| 1233 | runtime = 0; |
| 1234 | close(fd); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1235 | lib->name = ldname; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1236 | app->name = argv[0]; |
Rich Felker | 876748e | 2013-07-26 14:25:51 -0400 | [diff] [blame] | 1237 | aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry; |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1238 | /* Find the name that would have been used for the dynamic |
| 1239 | * linker had ldd not taken its place. */ |
| 1240 | if (ldd_mode) { |
| 1241 | for (i=0; i<app->phnum; i++) { |
| 1242 | if (app->phdr[i].p_type == PT_INTERP) |
| 1243 | lib->name = (void *)(app->base |
| 1244 | + app->phdr[i].p_vaddr); |
| 1245 | } |
| 1246 | dprintf(1, "\t%s (%p)\n", lib->name, lib->base); |
| 1247 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 1248 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1249 | if (app->tls_size) { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1250 | app->tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1251 | #ifdef TLS_ABOVE_TP |
| 1252 | app->tls_offset = 0; |
| 1253 | tls_offset = app->tls_size |
| 1254 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1255 | & (app->tls_align-1) ); |
| 1256 | #else |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 1257 | tls_offset = app->tls_offset = app->tls_size |
| 1258 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1259 | & (app->tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1260 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1261 | tls_align = MAXP2(tls_align, app->tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1262 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1263 | app->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1264 | decode_dyn(app); |
| 1265 | |
| 1266 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1267 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1268 | ehdr = (void *)vdso_base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1269 | vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 1270 | vdso->phnum = ehdr->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1271 | vdso->phentsize = ehdr->e_phentsize; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1272 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 1273 | if (phdr->p_type == PT_DYNAMIC) |
| 1274 | vdso->dynv = (void *)(vdso_base + phdr->p_offset); |
| 1275 | if (phdr->p_type == PT_LOAD) |
| 1276 | vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
| 1277 | } |
Rich Felker | 75a31fa | 2012-11-25 20:56:31 -0500 | [diff] [blame] | 1278 | vdso->name = ""; |
| 1279 | vdso->shortname = "linux-gate.so.1"; |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 1280 | vdso->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1281 | decode_dyn(vdso); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1282 | vdso->prev = lib; |
| 1283 | lib->next = vdso; |
| 1284 | } |
| 1285 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1286 | /* Initial dso chain consists only of the app. We temporarily |
| 1287 | * append the dynamic linker/libc so we can relocate it, then |
| 1288 | * restore the initial chain in preparation for loading third |
| 1289 | * party libraries (preload/needed). */ |
| 1290 | head = tail = app; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1291 | ldso = lib; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1292 | app->next = lib; |
| 1293 | reloc_all(lib); |
| 1294 | app->next = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1295 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1296 | /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */ |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1297 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1298 | /* Donate unused parts of app and library mapping to malloc */ |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1299 | reclaim_gaps(app); |
| 1300 | reclaim_gaps(lib); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1301 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1302 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | fd7015d | 2012-01-23 18:32:40 -0500 | [diff] [blame] | 1303 | * namespace, and perform all remaining relocations. The main |
| 1304 | * program must be relocated LAST since it may contain copy |
| 1305 | * relocations which depend on libraries' relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1306 | if (env_preload) load_preload(env_preload); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1307 | load_deps(app); |
| 1308 | make_global(app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1309 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1310 | #ifndef DYNAMIC_IS_RO |
| 1311 | for (i=0; app->dynv[i]; i+=2) |
| 1312 | if (app->dynv[i]==DT_DEBUG) |
| 1313 | app->dynv[i+1] = (size_t)&debug; |
| 1314 | #endif |
| 1315 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1316 | reloc_all(app->next); |
| 1317 | reloc_all(app); |
| 1318 | |
| 1319 | update_tls_size(); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1320 | if (libc.tls_size > sizeof builtin_tls) { |
| 1321 | initial_tls = calloc(libc.tls_size, 1); |
| 1322 | if (!initial_tls) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1323 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1324 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1325 | _exit(127); |
| 1326 | } |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1327 | } else { |
| 1328 | initial_tls = builtin_tls; |
| 1329 | } |
| 1330 | if (__init_tp(__copy_tls(initial_tls)) < 0 && tls_cnt) { |
| 1331 | dprintf(2, "%s: Thread-local storage not supported by kernel.\n", argv[0]); |
| 1332 | _exit(127); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1333 | } |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1334 | static_tls_cnt = tls_cnt; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1335 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1336 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1337 | if (ldd_mode) _exit(0); |
| 1338 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1339 | /* Switch to runtime mode: any further failures in the dynamic |
| 1340 | * linker are a reportable failure rather than a fatal startup |
| 1341 | * error. If the dynamic loader (dlopen) will not be used, free |
| 1342 | * all memory used by the dynamic linker. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1343 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1344 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1345 | debug.ver = 1; |
| 1346 | debug.bp = _dl_debug_state; |
| 1347 | debug.head = head; |
| 1348 | debug.base = lib->base; |
| 1349 | debug.state = 0; |
| 1350 | _dl_debug_state(); |
| 1351 | |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1352 | __init_libc(envp, argv[0]); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1353 | atexit(do_fini); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1354 | errno = 0; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1355 | do_init_fini(tail); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1356 | |
| 1357 | return (void *)aux[AT_ENTRY]; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1358 | } |
| 1359 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1360 | void *dlopen(const char *file, int mode) |
| 1361 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1362 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1363 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1364 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1365 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1366 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1367 | |
| 1368 | if (!file) return head; |
| 1369 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1370 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1371 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1372 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1373 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1374 | p = 0; |
| 1375 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1376 | orig_tls_offset = tls_offset; |
| 1377 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1378 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1379 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1380 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1381 | rtld_fail = &jb; |
| 1382 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1383 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1384 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1385 | if (p->deps[i]->global < 0) |
| 1386 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1387 | for (p=orig_tail->next; p; p=next) { |
| 1388 | next = p->next; |
| 1389 | munmap(p->map, p->map_len); |
Rich Felker | 9d15d5e | 2014-06-19 02:01:06 -0400 | [diff] [blame] | 1390 | while (p->td_index) { |
| 1391 | void *tmp = p->td_index->next; |
| 1392 | free(p->td_index); |
| 1393 | p->td_index = tmp; |
| 1394 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1395 | free(p->deps); |
| 1396 | free(p); |
| 1397 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1398 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1399 | tls_offset = orig_tls_offset; |
| 1400 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1401 | tail = orig_tail; |
| 1402 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1403 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1404 | errflag = 1; |
| 1405 | goto end; |
Rich Felker | 0f9b1f6 | 2013-08-23 23:13:25 -0400 | [diff] [blame] | 1406 | } else p = load_library(file, head); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1407 | |
| 1408 | if (!p) { |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1409 | snprintf(errbuf, sizeof errbuf, noload ? |
| 1410 | "Library %s is not already loaded" : |
| 1411 | "Error loading shared library %s: %m", |
| 1412 | file); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1413 | errflag = 1; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1414 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1415 | } |
| 1416 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1417 | /* First load handling */ |
| 1418 | if (!p->deps) { |
| 1419 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1420 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1421 | if (!p->deps[i]->global) |
| 1422 | p->deps[i]->global = -1; |
| 1423 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1424 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1425 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1426 | if (p->deps[i]->global < 0) |
| 1427 | p->deps[i]->global = 0; |
| 1428 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1429 | } |
| 1430 | |
| 1431 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1432 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1433 | p->deps[i]->global = 1; |
| 1434 | p->global = 1; |
| 1435 | } |
| 1436 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1437 | update_tls_size(); |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1438 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1439 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1440 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1441 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1442 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1443 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1444 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1445 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1446 | return p; |
| 1447 | } |
| 1448 | |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1449 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1450 | { |
| 1451 | struct dso *p; |
| 1452 | for (p=head; p; p=p->next) if (h==p) return 0; |
| 1453 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1454 | errflag = 1; |
| 1455 | return 1; |
| 1456 | } |
| 1457 | |
Rich Felker | 5ba238e | 2014-06-19 02:59:44 -0400 | [diff] [blame] | 1458 | void *__tls_get_addr(size_t *); |
| 1459 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1460 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1461 | { |
| 1462 | size_t i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1463 | uint32_t h = 0, gh = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1464 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1465 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1466 | if (p == RTLD_DEFAULT) { |
| 1467 | p = head; |
| 1468 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1469 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1470 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1471 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1472 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1473 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1474 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1475 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1476 | return __tls_get_addr((size_t []){def.dso->tls_id, def.sym->st_value}); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1477 | return def.dso->base + def.sym->st_value; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1478 | } |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1479 | if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p)) |
| 1480 | return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1481 | if (p->ghashtab) { |
| 1482 | gh = gnu_hash(s); |
| 1483 | sym = gnu_lookup(s, gh, p); |
| 1484 | } else { |
| 1485 | h = sysv_hash(s); |
| 1486 | sym = sysv_lookup(s, h, p); |
| 1487 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1488 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1489 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1490 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1491 | return p->base + sym->st_value; |
| 1492 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1493 | if (p->deps[i]->ghashtab) { |
| 1494 | if (!gh) gh = gnu_hash(s); |
Rich Felker | a5d6199 | 2012-08-25 17:40:27 -0400 | [diff] [blame] | 1495 | sym = gnu_lookup(s, gh, p->deps[i]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1496 | } else { |
| 1497 | if (!h) h = sysv_hash(s); |
| 1498 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1499 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1500 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1501 | return __tls_get_addr((size_t []){p->deps[i]->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1502 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1503 | return p->deps[i]->base + sym->st_value; |
| 1504 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1505 | failed: |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1506 | errflag = 1; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1507 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1508 | return 0; |
| 1509 | } |
| 1510 | |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1511 | int __dladdr(const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1512 | { |
| 1513 | struct dso *p; |
| 1514 | Sym *sym; |
| 1515 | uint32_t nsym; |
| 1516 | char *strings; |
| 1517 | size_t i; |
| 1518 | void *best = 0; |
| 1519 | char *bestname; |
| 1520 | |
| 1521 | pthread_rwlock_rdlock(&lock); |
| 1522 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1523 | pthread_rwlock_unlock(&lock); |
| 1524 | |
| 1525 | if (!p) return 0; |
| 1526 | |
| 1527 | sym = p->syms; |
| 1528 | strings = p->strings; |
| 1529 | if (p->hashtab) { |
| 1530 | nsym = p->hashtab[1]; |
| 1531 | } else { |
| 1532 | uint32_t *buckets; |
| 1533 | uint32_t *hashval; |
| 1534 | buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 1535 | sym += p->ghashtab[1]; |
Rich Felker | 7886985 | 2013-10-04 00:29:58 -0400 | [diff] [blame] | 1536 | for (i = nsym = 0; i < p->ghashtab[0]; i++) { |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1537 | if (buckets[i] > nsym) |
| 1538 | nsym = buckets[i]; |
| 1539 | } |
| 1540 | if (nsym) { |
| 1541 | nsym -= p->ghashtab[1]; |
| 1542 | hashval = buckets + p->ghashtab[0] + nsym; |
| 1543 | do nsym++; |
| 1544 | while (!(*hashval++ & 1)); |
| 1545 | } |
| 1546 | } |
| 1547 | |
| 1548 | for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1549 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1550 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1551 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
| 1552 | void *symaddr = p->base + sym->st_value; |
| 1553 | if (symaddr > addr || symaddr < best) |
| 1554 | continue; |
| 1555 | best = symaddr; |
| 1556 | bestname = strings + sym->st_name; |
| 1557 | if (addr == symaddr) |
| 1558 | break; |
| 1559 | } |
| 1560 | } |
| 1561 | |
| 1562 | if (!best) return 0; |
| 1563 | |
| 1564 | info->dli_fname = p->name; |
| 1565 | info->dli_fbase = p->base; |
| 1566 | info->dli_sname = bestname; |
| 1567 | info->dli_saddr = best; |
| 1568 | |
| 1569 | return 1; |
| 1570 | } |
| 1571 | |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1572 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1573 | { |
| 1574 | void *res; |
| 1575 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1576 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1577 | pthread_rwlock_unlock(&lock); |
| 1578 | return res; |
| 1579 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1580 | |
| 1581 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1582 | { |
| 1583 | struct dso *current; |
| 1584 | struct dl_phdr_info info; |
| 1585 | int ret = 0; |
| 1586 | for(current = head; current;) { |
| 1587 | info.dlpi_addr = (uintptr_t)current->base; |
| 1588 | info.dlpi_name = current->name; |
| 1589 | info.dlpi_phdr = current->phdr; |
| 1590 | info.dlpi_phnum = current->phnum; |
| 1591 | info.dlpi_adds = gencnt; |
| 1592 | info.dlpi_subs = 0; |
| 1593 | info.dlpi_tls_modid = current->tls_id; |
| 1594 | info.dlpi_tls_data = current->tls_image; |
| 1595 | |
| 1596 | ret = (callback)(&info, sizeof (info), data); |
| 1597 | |
| 1598 | if (ret != 0) break; |
| 1599 | |
| 1600 | pthread_rwlock_rdlock(&lock); |
| 1601 | current = current->next; |
| 1602 | pthread_rwlock_unlock(&lock); |
| 1603 | } |
| 1604 | return ret; |
| 1605 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1606 | #else |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1607 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1608 | { |
| 1609 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1610 | errflag = 1; |
| 1611 | return 1; |
| 1612 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1613 | void *dlopen(const char *file, int mode) |
| 1614 | { |
Clément Vasseur | dc65fdd | 2014-08-07 17:49:29 +0200 | [diff] [blame] | 1615 | strcpy(errbuf, "Dynamic loading not supported"); |
| 1616 | errflag = 1; |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1617 | return 0; |
| 1618 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1619 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1620 | { |
Rich Felker | 4fe57ca | 2014-08-08 00:53:27 -0400 | [diff] [blame] | 1621 | errflag = 1; |
| 1622 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1623 | return 0; |
| 1624 | } |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1625 | int __dladdr (const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1626 | { |
| 1627 | return 0; |
| 1628 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1629 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1630 | |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1631 | int __dlinfo(void *dso, int req, void *res) |
| 1632 | { |
| 1633 | if (invalid_dso_handle(dso)) return -1; |
| 1634 | if (req != RTLD_DI_LINKMAP) { |
| 1635 | snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req); |
| 1636 | errflag = 1; |
| 1637 | return -1; |
| 1638 | } |
| 1639 | *(struct link_map **)res = dso; |
| 1640 | return 0; |
| 1641 | } |
| 1642 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1643 | char *dlerror() |
| 1644 | { |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1645 | if (!errflag) return 0; |
| 1646 | errflag = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1647 | return errbuf; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1648 | } |
| 1649 | |
| 1650 | int dlclose(void *p) |
| 1651 | { |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1652 | return invalid_dso_handle(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1653 | } |