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 | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 5 | #include <string.h> |
| 6 | #include <unistd.h> |
| 7 | #include <stdint.h> |
| 8 | #include <elf.h> |
| 9 | #include <sys/mman.h> |
| 10 | #include <limits.h> |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 11 | #include <fcntl.h> |
| 12 | #include <sys/stat.h> |
| 13 | #include <errno.h> |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 14 | #include <link.h> |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 15 | #include <setjmp.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 16 | #include <pthread.h> |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 17 | #include <ctype.h> |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 18 | #include <dlfcn.h> |
Rich Felker | 8431d79 | 2012-10-04 16:35:46 -0400 | [diff] [blame] | 19 | #include "pthread_impl.h" |
| 20 | #include "libc.h" |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 21 | |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 22 | static int errflag; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 23 | static char errbuf[128]; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 24 | |
Rich Felker | e864a29 | 2012-07-11 01:47:30 -0400 | [diff] [blame] | 25 | #ifdef SHARED |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 26 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 27 | #if ULONG_MAX == 0xffffffff |
| 28 | typedef Elf32_Ehdr Ehdr; |
| 29 | typedef Elf32_Phdr Phdr; |
| 30 | typedef Elf32_Sym Sym; |
| 31 | #define R_TYPE(x) ((x)&255) |
| 32 | #define R_SYM(x) ((x)>>8) |
| 33 | #else |
| 34 | typedef Elf64_Ehdr Ehdr; |
| 35 | typedef Elf64_Phdr Phdr; |
| 36 | typedef Elf64_Sym Sym; |
| 37 | #define R_TYPE(x) ((x)&0xffffffff) |
| 38 | #define R_SYM(x) ((x)>>32) |
| 39 | #endif |
| 40 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 41 | #define MAXP2(a,b) (-(-(a)&-(b))) |
| 42 | #define ALIGN(x,y) ((x)+(y)-1 & -(y)) |
| 43 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 44 | struct debug { |
| 45 | int ver; |
| 46 | void *head; |
| 47 | void (*bp)(void); |
| 48 | int state; |
| 49 | void *base; |
| 50 | }; |
| 51 | |
| 52 | struct dso { |
| 53 | unsigned char *base; |
| 54 | char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 55 | size_t *dynv; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 56 | struct dso *next, *prev; |
| 57 | |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 58 | Phdr *phdr; |
| 59 | int phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 60 | size_t phentsize; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 61 | int refcnt; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 62 | Sym *syms; |
Rich Felker | 596d60c | 2011-06-18 22:52:01 -0400 | [diff] [blame] | 63 | uint32_t *hashtab; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 64 | uint32_t *ghashtab; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 65 | int16_t *versym; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 66 | char *strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 67 | unsigned char *map; |
| 68 | size_t map_len; |
| 69 | dev_t dev; |
| 70 | ino_t ino; |
Rich Felker | 6343ac8 | 2012-06-09 21:20:44 -0400 | [diff] [blame] | 71 | signed char global; |
Rich Felker | 700a815 | 2012-02-07 20:29:29 -0500 | [diff] [blame] | 72 | char relocated; |
| 73 | char constructed; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 74 | char kernel_mapped; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 75 | struct dso **deps, *needed_by; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 76 | char *rpath_orig, *rpath; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 77 | void *tls_image; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 78 | size_t tls_len, tls_size, tls_align, tls_id, tls_offset; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 79 | size_t relro_start, relro_end; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 80 | void **new_dtv; |
| 81 | unsigned char *new_tls; |
| 82 | int new_dtv_idx, new_tls_idx; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 83 | struct dso *fini_next; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 84 | char *shortname; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 85 | char buf[]; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 86 | }; |
| 87 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 88 | struct symdef { |
| 89 | Sym *sym; |
| 90 | struct dso *dso; |
| 91 | }; |
| 92 | |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 93 | enum { |
| 94 | REL_ERR, |
| 95 | REL_SYMBOLIC, |
| 96 | REL_GOT, |
| 97 | REL_PLT, |
| 98 | REL_RELATIVE, |
| 99 | REL_OFFSET, |
| 100 | REL_OFFSET32, |
| 101 | REL_COPY, |
| 102 | REL_SYM_OR_REL, |
| 103 | REL_TLS, /* everything past here is TLS */ |
| 104 | REL_DTPMOD, |
| 105 | REL_DTPOFF, |
| 106 | REL_TPOFF, |
| 107 | REL_TPOFF_NEG, |
| 108 | }; |
| 109 | |
Rich Felker | 59f4086 | 2012-08-05 13:46:39 -0400 | [diff] [blame] | 110 | #include "reloc.h" |
| 111 | |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 112 | int __init_tp(void *); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 113 | void __init_libc(char **, char *); |
Rich Felker | 60872cf | 2012-04-24 18:07:59 -0400 | [diff] [blame] | 114 | |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 115 | const char *__libc_get_version(void); |
| 116 | |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 117 | static struct dso *head, *tail, *ldso, *fini_head; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 118 | static char *env_path, *sys_path; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 119 | static unsigned long long gencnt; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 120 | static int runtime; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 121 | static int ldd_mode; |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 122 | static int ldso_fail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 123 | static int noload; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 124 | static jmp_buf *rtld_fail; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 125 | static pthread_rwlock_t lock; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 126 | static struct debug debug; |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 127 | static size_t tls_cnt, tls_offset, tls_align = 4*sizeof(size_t); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 128 | static pthread_mutex_t init_fini_lock = { ._m_type = PTHREAD_MUTEX_RECURSIVE }; |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 129 | static long long builtin_tls[(sizeof(struct pthread) + 64)/sizeof(long long)]; |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 130 | |
| 131 | struct debug *_dl_debug_addr = &debug; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 132 | |
Rich Felker | 0a96a37 | 2012-10-07 21:43:46 -0400 | [diff] [blame] | 133 | #define AUX_CNT 38 |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 134 | #define DYN_CNT 34 |
| 135 | |
| 136 | static void decode_vec(size_t *v, size_t *a, size_t cnt) |
| 137 | { |
| 138 | memset(a, 0, cnt*sizeof(size_t)); |
| 139 | for (; v[0]; v+=2) if (v[0]<cnt) { |
| 140 | a[0] |= 1ULL<<v[0]; |
| 141 | a[v[0]] = v[1]; |
| 142 | } |
| 143 | } |
| 144 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 145 | static int search_vec(size_t *v, size_t *r, size_t key) |
| 146 | { |
| 147 | for (; v[0]!=key; v+=2) |
| 148 | if (!v[0]) return 0; |
| 149 | *r = v[1]; |
| 150 | return 1; |
| 151 | } |
| 152 | |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame^] | 153 | static void error(const char *fmt, ...) |
| 154 | { |
| 155 | va_list ap; |
| 156 | va_start(ap, fmt); |
| 157 | vsnprintf(errbuf, sizeof errbuf, fmt, ap); |
| 158 | va_end(ap); |
| 159 | if (runtime) longjmp(*rtld_fail, 1); |
| 160 | dprintf(2, "%s\n", errbuf); |
| 161 | ldso_fail = 1; |
| 162 | } |
| 163 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 164 | static uint32_t sysv_hash(const char *s0) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 165 | { |
Rich Felker | 2adf2fb | 2012-01-17 00:34:58 -0500 | [diff] [blame] | 166 | const unsigned char *s = (void *)s0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 167 | uint_fast32_t h = 0; |
| 168 | while (*s) { |
| 169 | h = 16*h + *s++; |
| 170 | h ^= h>>24 & 0xf0; |
| 171 | } |
| 172 | return h & 0xfffffff; |
| 173 | } |
| 174 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 175 | static uint32_t gnu_hash(const char *s0) |
| 176 | { |
| 177 | const unsigned char *s = (void *)s0; |
| 178 | uint_fast32_t h = 5381; |
| 179 | for (; *s; s++) |
| 180 | h = h*33 + *s; |
| 181 | return h; |
| 182 | } |
| 183 | |
| 184 | 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] | 185 | { |
| 186 | size_t i; |
Rich Felker | 05eff01 | 2012-08-05 02:38:35 -0400 | [diff] [blame] | 187 | Sym *syms = dso->syms; |
| 188 | uint32_t *hashtab = dso->hashtab; |
| 189 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 190 | 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] | 191 | if ((!dso->versym || dso->versym[i] >= 0) |
| 192 | && (!strcmp(s, strings+syms[i].st_name))) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 193 | return syms+i; |
| 194 | } |
| 195 | return 0; |
| 196 | } |
| 197 | |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 198 | static Sym *gnu_lookup(const char *s, uint32_t h1, struct dso *dso) |
| 199 | { |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 200 | Sym *syms = dso->syms; |
| 201 | char *strings = dso->strings; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 202 | uint32_t *hashtab = dso->ghashtab; |
| 203 | uint32_t nbuckets = hashtab[0]; |
| 204 | uint32_t *buckets = hashtab + 4 + hashtab[2]*(sizeof(size_t)/4); |
| 205 | uint32_t h2; |
| 206 | uint32_t *hashval; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 207 | uint32_t i = buckets[h1 % nbuckets]; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 208 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 209 | if (!i) return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 210 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 211 | hashval = buckets + nbuckets + (i - hashtab[1]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 212 | |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 213 | for (h1 |= 1; ; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 214 | h2 = *hashval++; |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 215 | if ((!dso->versym || dso->versym[i] >= 0) |
| 216 | && (h1 == (h2|1)) && !strcmp(s, strings + syms[i].st_name)) |
| 217 | return syms+i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 218 | if (h2 & 1) break; |
| 219 | } |
| 220 | |
| 221 | return 0; |
| 222 | } |
| 223 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 224 | #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] | 225 | #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] | 226 | |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 227 | 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] | 228 | { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 229 | uint32_t h = 0, gh = 0; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 230 | struct symdef def = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 231 | for (; dso; dso=dso->next) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 232 | Sym *sym; |
| 233 | if (!dso->global) continue; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 234 | if (dso->ghashtab) { |
| 235 | if (!gh) gh = gnu_hash(s); |
| 236 | sym = gnu_lookup(s, gh, dso); |
| 237 | } else { |
| 238 | if (!h) h = sysv_hash(s); |
| 239 | sym = sysv_lookup(s, h, dso); |
| 240 | } |
Rich Felker | bd17431 | 2012-10-06 01:36:11 -0400 | [diff] [blame] | 241 | if (!sym) continue; |
| 242 | if (!sym->st_shndx) |
| 243 | if (need_def || (sym->st_info&0xf) == STT_TLS) |
| 244 | continue; |
| 245 | if (!sym->st_value) |
| 246 | if ((sym->st_info&0xf) != STT_TLS) |
| 247 | continue; |
| 248 | if (!(1<<(sym->st_info&0xf) & OK_TYPES)) continue; |
| 249 | if (!(1<<(sym->st_info>>4) & OK_BINDS)) continue; |
| 250 | |
| 251 | if (def.sym && sym->st_info>>4 == STB_WEAK) continue; |
| 252 | def.sym = sym; |
| 253 | def.dso = dso; |
| 254 | if (sym->st_info>>4 == STB_GLOBAL) break; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 255 | } |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 256 | return def; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 257 | } |
| 258 | |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 259 | #define NO_INLINE_ADDEND (1<<REL_COPY | 1<<REL_GOT | 1<<REL_PLT) |
| 260 | |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 261 | 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] | 262 | { |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 263 | unsigned char *base = dso->base; |
| 264 | Sym *syms = dso->syms; |
| 265 | char *strings = dso->strings; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 266 | Sym *sym; |
| 267 | const char *name; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 268 | void *ctx; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 269 | int astype, type; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 270 | int sym_index; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 271 | struct symdef def; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 272 | size_t *reloc_addr; |
| 273 | size_t sym_val; |
| 274 | size_t tls_val; |
| 275 | size_t addend; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 276 | |
| 277 | for (; rel_size; rel+=stride, rel_size-=stride*sizeof(size_t)) { |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 278 | astype = R_TYPE(rel[1]); |
| 279 | if (!astype) continue; |
| 280 | type = remap_rel(astype); |
| 281 | if (!type) { |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame^] | 282 | error(errbuf, sizeof errbuf, |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 283 | "Error relocating %s: unsupported relocation type %d", |
| 284 | dso->name, astype); |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 285 | continue; |
| 286 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 287 | sym_index = R_SYM(rel[1]); |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 288 | reloc_addr = (void *)(base + rel[0]); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 289 | if (sym_index) { |
| 290 | sym = syms + sym_index; |
| 291 | name = strings + sym->st_name; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 292 | ctx = type==REL_COPY ? head->next : head; |
| 293 | def = find_sym(ctx, name, type==REL_PLT); |
Rich Felker | 69003e0 | 2014-01-21 00:36:35 -0500 | [diff] [blame] | 294 | if (!def.sym && (sym->st_shndx != SHN_UNDEF |
| 295 | || sym->st_info>>4 != STB_WEAK)) { |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame^] | 296 | error(errbuf, sizeof errbuf, |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 297 | "Error relocating %s: %s: symbol not found", |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 298 | dso->name, name); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 299 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 300 | } |
Rich Felker | 7d9a5c6 | 2012-08-05 14:03:17 -0400 | [diff] [blame] | 301 | } else { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 302 | sym = 0; |
| 303 | def.sym = 0; |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 304 | def.dso = dso; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 305 | } |
Rich Felker | adf94c1 | 2014-06-18 02:44:02 -0400 | [diff] [blame] | 306 | |
| 307 | addend = stride>2 ? rel[2] |
| 308 | : (1<<type & NO_INLINE_ADDEND) ? 0 |
| 309 | : *reloc_addr; |
| 310 | |
| 311 | sym_val = def.sym ? (size_t)def.dso->base+def.sym->st_value : 0; |
| 312 | tls_val = def.sym ? def.sym->st_value : 0; |
| 313 | |
| 314 | switch(type) { |
| 315 | case REL_OFFSET: |
| 316 | addend -= (size_t)reloc_addr; |
| 317 | case REL_SYMBOLIC: |
| 318 | case REL_GOT: |
| 319 | case REL_PLT: |
| 320 | *reloc_addr = sym_val + addend; |
| 321 | break; |
| 322 | case REL_RELATIVE: |
| 323 | *reloc_addr = (size_t)base + addend; |
| 324 | break; |
| 325 | case REL_SYM_OR_REL: |
| 326 | if (sym) *reloc_addr = sym_val + addend; |
| 327 | else *reloc_addr = (size_t)base + addend; |
| 328 | break; |
| 329 | case REL_COPY: |
| 330 | memcpy(reloc_addr, (void *)sym_val, sym->st_size); |
| 331 | break; |
| 332 | case REL_OFFSET32: |
| 333 | *(uint32_t *)reloc_addr = sym_val + addend |
| 334 | - (size_t)reloc_addr; |
| 335 | break; |
| 336 | case REL_DTPMOD: |
| 337 | *reloc_addr = def.dso->tls_id; |
| 338 | break; |
| 339 | case REL_DTPOFF: |
| 340 | *reloc_addr = tls_val + addend; |
| 341 | break; |
| 342 | #ifdef TLS_ABOVE_TP |
| 343 | case REL_TPOFF: |
| 344 | *reloc_addr = tls_val + def.dso->tls_offset + TPOFF_K + addend; |
| 345 | break; |
| 346 | #else |
| 347 | case REL_TPOFF: |
| 348 | *reloc_addr = tls_val - def.dso->tls_offset + addend; |
| 349 | break; |
| 350 | case REL_TPOFF_NEG: |
| 351 | *reloc_addr = def.dso->tls_offset - tls_val + addend; |
| 352 | break; |
| 353 | #endif |
| 354 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 355 | } |
| 356 | } |
| 357 | |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 358 | /* A huge hack: to make up for the wastefulness of shared libraries |
| 359 | * needing at least a page of dirty memory even if they have no global |
| 360 | * data, we reclaim the gaps at the beginning and end of writable maps |
| 361 | * and "donate" them to the heap by setting up minimal malloc |
| 362 | * structures and then freeing them. */ |
| 363 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 364 | static void reclaim(struct dso *dso, size_t start, size_t end) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 365 | { |
| 366 | size_t *a, *z; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 367 | if (start >= dso->relro_start && start < dso->relro_end) start = dso->relro_end; |
| 368 | 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] | 369 | start = start + 6*sizeof(size_t)-1 & -4*sizeof(size_t); |
| 370 | end = (end & -4*sizeof(size_t)) - 2*sizeof(size_t); |
| 371 | if (start>end || end-start < 4*sizeof(size_t)) return; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 372 | a = (size_t *)(dso->base + start); |
| 373 | z = (size_t *)(dso->base + end); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 374 | a[-2] = 1; |
| 375 | a[-1] = z[0] = end-start + 2*sizeof(size_t) | 1; |
| 376 | z[1] = 1; |
| 377 | free(a); |
| 378 | } |
| 379 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 380 | static void reclaim_gaps(struct dso *dso) |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 381 | { |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 382 | Phdr *ph = dso->phdr; |
| 383 | size_t phcnt = dso->phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 384 | |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 385 | for (; phcnt--; ph=(void *)((char *)ph+dso->phentsize)) { |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 386 | if (ph->p_type!=PT_LOAD) continue; |
| 387 | 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] | 388 | reclaim(dso, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr); |
| 389 | reclaim(dso, ph->p_vaddr+ph->p_memsz, |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 390 | ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE); |
| 391 | } |
| 392 | } |
| 393 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 394 | static void *map_library(int fd, struct dso *dso) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 395 | { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 396 | Ehdr buf[(896+sizeof(Ehdr))/sizeof(Ehdr)]; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 397 | void *allocated_buf=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 398 | size_t phsize; |
| 399 | size_t addr_min=SIZE_MAX, addr_max=0, map_len; |
| 400 | size_t this_min, this_max; |
| 401 | off_t off_start; |
| 402 | Ehdr *eh; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 403 | Phdr *ph, *ph0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 404 | unsigned prot; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 405 | unsigned char *map=MAP_FAILED, *base; |
Rich Felker | 7443dd2 | 2013-08-02 09:25:12 -0400 | [diff] [blame] | 406 | size_t dyn=0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 407 | size_t tls_image=0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 408 | size_t i; |
| 409 | |
| 410 | ssize_t l = read(fd, buf, sizeof buf); |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 411 | eh = buf; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 412 | if (l<0) return 0; |
| 413 | if (l<sizeof *eh || (eh->e_type != ET_DYN && eh->e_type != ET_EXEC)) |
| 414 | goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 415 | phsize = eh->e_phentsize * eh->e_phnum; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 416 | if (phsize > sizeof buf - sizeof *eh) { |
| 417 | allocated_buf = malloc(phsize); |
| 418 | if (!allocated_buf) return 0; |
| 419 | l = pread(fd, allocated_buf, phsize, eh->e_phoff); |
| 420 | if (l < 0) goto error; |
| 421 | if (l != phsize) goto noexec; |
| 422 | ph = ph0 = allocated_buf; |
| 423 | } else if (eh->e_phoff + phsize > l) { |
Rich Felker | 59633c7 | 2011-06-25 12:26:08 -0400 | [diff] [blame] | 424 | l = pread(fd, buf+1, phsize, eh->e_phoff); |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 425 | if (l < 0) goto error; |
| 426 | if (l != phsize) goto noexec; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 427 | ph = ph0 = (void *)(buf + 1); |
| 428 | } else { |
| 429 | ph = ph0 = (void *)((char *)buf + eh->e_phoff); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 430 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 431 | 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] | 432 | if (ph->p_type == PT_DYNAMIC) { |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 433 | dyn = ph->p_vaddr; |
Rich Felker | fa7248c | 2014-03-25 16:21:50 -0400 | [diff] [blame] | 434 | } else if (ph->p_type == PT_TLS) { |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 435 | tls_image = ph->p_vaddr; |
| 436 | dso->tls_align = ph->p_align; |
| 437 | dso->tls_len = ph->p_filesz; |
| 438 | dso->tls_size = ph->p_memsz; |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 439 | } else if (ph->p_type == PT_GNU_RELRO) { |
| 440 | dso->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 441 | dso->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 442 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 443 | if (ph->p_type != PT_LOAD) continue; |
| 444 | if (ph->p_vaddr < addr_min) { |
| 445 | addr_min = ph->p_vaddr; |
| 446 | off_start = ph->p_offset; |
| 447 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 448 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 449 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
| 450 | } |
| 451 | if (ph->p_vaddr+ph->p_memsz > addr_max) { |
| 452 | addr_max = ph->p_vaddr+ph->p_memsz; |
| 453 | } |
| 454 | } |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 455 | if (!dyn) goto noexec; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 456 | addr_max += PAGE_SIZE-1; |
| 457 | addr_max &= -PAGE_SIZE; |
| 458 | addr_min &= -PAGE_SIZE; |
| 459 | off_start &= -PAGE_SIZE; |
| 460 | map_len = addr_max - addr_min + off_start; |
| 461 | /* The first time, we map too much, possibly even more than |
| 462 | * the length of the file. This is okay because we will not |
| 463 | * use the invalid part; we just need to reserve the right |
| 464 | * amount of virtual address space to map over later. */ |
Rich Felker | bf30100 | 2011-06-28 14:20:41 -0400 | [diff] [blame] | 465 | 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] | 466 | if (map==MAP_FAILED) goto error; |
Rich Felker | 339516a | 2013-07-31 14:42:08 -0400 | [diff] [blame] | 467 | /* If the loaded file is not relocatable and the requested address is |
| 468 | * not available, then the load operation must fail. */ |
| 469 | if (eh->e_type != ET_DYN && addr_min && map!=(void *)addr_min) { |
| 470 | errno = EBUSY; |
| 471 | goto error; |
| 472 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 473 | base = map - addr_min; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 474 | dso->phdr = 0; |
| 475 | dso->phnum = 0; |
| 476 | 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] | 477 | if (ph->p_type != PT_LOAD) continue; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 478 | /* Check if the programs headers are in this load segment, and |
| 479 | * if so, record the address for use by dl_iterate_phdr. */ |
| 480 | if (!dso->phdr && eh->e_phoff >= ph->p_offset |
| 481 | && eh->e_phoff+phsize <= ph->p_offset+ph->p_filesz) { |
| 482 | dso->phdr = (void *)(base + ph->p_vaddr |
| 483 | + (eh->e_phoff-ph->p_offset)); |
| 484 | dso->phnum = eh->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 485 | dso->phentsize = eh->e_phentsize; |
Rich Felker | 30763fd | 2013-07-10 14:38:20 -0400 | [diff] [blame] | 486 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 487 | /* Reuse the existing mapping for the lowest-address LOAD */ |
| 488 | if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue; |
| 489 | this_min = ph->p_vaddr & -PAGE_SIZE; |
| 490 | this_max = ph->p_vaddr+ph->p_memsz+PAGE_SIZE-1 & -PAGE_SIZE; |
| 491 | off_start = ph->p_offset & -PAGE_SIZE; |
| 492 | prot = (((ph->p_flags&PF_R) ? PROT_READ : 0) | |
| 493 | ((ph->p_flags&PF_W) ? PROT_WRITE: 0) | |
| 494 | ((ph->p_flags&PF_X) ? PROT_EXEC : 0)); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 495 | if (mmap(base+this_min, this_max-this_min, prot, MAP_PRIVATE|MAP_FIXED, fd, off_start) == MAP_FAILED) |
| 496 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 497 | if (ph->p_memsz > ph->p_filesz) { |
| 498 | size_t brk = (size_t)base+ph->p_vaddr+ph->p_filesz; |
| 499 | size_t pgbrk = brk+PAGE_SIZE-1 & -PAGE_SIZE; |
| 500 | memset((void *)brk, 0, pgbrk-brk & PAGE_SIZE-1); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 501 | 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) |
| 502 | goto error; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 503 | } |
| 504 | } |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 505 | for (i=0; ((size_t *)(base+dyn))[i]; i+=2) |
| 506 | if (((size_t *)(base+dyn))[i]==DT_TEXTREL) { |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 507 | if (mprotect(map, map_len, PROT_READ|PROT_WRITE|PROT_EXEC) < 0) |
| 508 | goto error; |
Rich Felker | 9f17413 | 2011-06-29 00:29:08 -0400 | [diff] [blame] | 509 | break; |
| 510 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 511 | dso->map = map; |
| 512 | dso->map_len = map_len; |
| 513 | dso->base = base; |
| 514 | dso->dynv = (void *)(base+dyn); |
| 515 | if (dso->tls_size) dso->tls_image = (void *)(base+tls_image); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 516 | if (!runtime) reclaim_gaps(dso); |
Rich Felker | 8d01dfc | 2013-08-02 09:59:02 -0400 | [diff] [blame] | 517 | free(allocated_buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 518 | return map; |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 519 | noexec: |
| 520 | errno = ENOEXEC; |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 521 | error: |
Rich Felker | d5884a5 | 2013-08-02 09:56:49 -0400 | [diff] [blame] | 522 | if (map!=MAP_FAILED) munmap(map, map_len); |
| 523 | free(allocated_buf); |
Rich Felker | f7d15dc | 2012-06-06 11:21:28 -0400 | [diff] [blame] | 524 | return 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 525 | } |
| 526 | |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 527 | 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] | 528 | { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 529 | size_t l; |
| 530 | int fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 531 | for (;;) { |
Rich Felker | 8c203ea | 2013-04-20 11:51:58 -0400 | [diff] [blame] | 532 | s += strspn(s, ":\n"); |
| 533 | l = strcspn(s, ":\n"); |
| 534 | if (l-1 >= INT_MAX) return -1; |
| 535 | if (snprintf(buf, buf_size, "%.*s/%s", (int)l, s, name) >= buf_size) |
| 536 | continue; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 537 | if ((fd = open(buf, O_RDONLY|O_CLOEXEC))>=0) return fd; |
Rich Felker | 49388f3 | 2011-06-25 17:49:16 -0400 | [diff] [blame] | 538 | s += l; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 539 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 540 | } |
| 541 | |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 542 | static int fixup_rpath(struct dso *p, char *buf, size_t buf_size) |
| 543 | { |
| 544 | size_t n, l; |
| 545 | const char *s, *t, *origin; |
| 546 | char *d; |
| 547 | if (p->rpath) return 0; |
| 548 | if (!p->rpath_orig) return -1; |
| 549 | if (!strchr(p->rpath_orig, '$')) { |
| 550 | p->rpath = p->rpath_orig; |
| 551 | return 0; |
| 552 | } |
| 553 | n = 0; |
| 554 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 555 | while ((t=strchr(s, '$'))) { |
| 556 | if (strncmp(t, "$ORIGIN", 7) && strncmp(t, "${ORIGIN}", 9)) |
| 557 | return -1; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 558 | s = t+1; |
| 559 | n++; |
| 560 | } |
| 561 | if (n > SSIZE_MAX/PATH_MAX) return -1; |
| 562 | |
| 563 | if (p->kernel_mapped) { |
| 564 | /* $ORIGIN searches cannot be performed for the main program |
| 565 | * when it is suid/sgid/AT_SECURE. This is because the |
| 566 | * pathname is under the control of the caller of execve. |
| 567 | * For libraries, however, $ORIGIN can be processed safely |
| 568 | * since the library's pathname came from a trusted source |
| 569 | * (either system paths or a call to dlopen). */ |
| 570 | if (libc.secure) |
| 571 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 572 | l = readlink("/proc/self/exe", buf, buf_size); |
| 573 | if (l >= buf_size) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 574 | return -1; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 575 | buf[l] = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 576 | origin = buf; |
| 577 | } else { |
| 578 | origin = p->name; |
| 579 | } |
| 580 | t = strrchr(origin, '/'); |
| 581 | l = t ? t-origin : 0; |
| 582 | p->rpath = malloc(strlen(p->rpath_orig) + n*l + 1); |
| 583 | if (!p->rpath) return -1; |
| 584 | |
| 585 | d = p->rpath; |
| 586 | s = p->rpath_orig; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 587 | while ((t=strchr(s, '$'))) { |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 588 | memcpy(d, s, t-s); |
| 589 | d += t-s; |
| 590 | memcpy(d, origin, l); |
| 591 | d += l; |
Rich Felker | d2c42ed | 2013-08-23 15:51:59 -0400 | [diff] [blame] | 592 | /* It was determined previously that the '$' is followed |
| 593 | * either by "ORIGIN" or "{ORIGIN}". */ |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 594 | s = t + 7 + 2*(t[1]=='{'); |
| 595 | } |
| 596 | strcpy(d, s); |
| 597 | return 0; |
| 598 | } |
| 599 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 600 | static void decode_dyn(struct dso *p) |
| 601 | { |
| 602 | size_t dyn[DYN_CNT] = {0}; |
| 603 | decode_vec(p->dynv, dyn, DYN_CNT); |
| 604 | p->syms = (void *)(p->base + dyn[DT_SYMTAB]); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 605 | p->strings = (void *)(p->base + dyn[DT_STRTAB]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 606 | if (dyn[0]&(1<<DT_HASH)) |
| 607 | p->hashtab = (void *)(p->base + dyn[DT_HASH]); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 608 | if (dyn[0]&(1<<DT_RPATH)) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 609 | p->rpath_orig = (void *)(p->strings + dyn[DT_RPATH]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 610 | if (search_vec(p->dynv, dyn, DT_GNU_HASH)) |
| 611 | p->ghashtab = (void *)(p->base + *dyn); |
Rich Felker | 72482f9 | 2013-08-08 16:10:35 -0400 | [diff] [blame] | 612 | if (search_vec(p->dynv, dyn, DT_VERSYM)) |
| 613 | p->versym = (void *)(p->base + *dyn); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 614 | } |
| 615 | |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 616 | static struct dso *load_library(const char *name, struct dso *needed_by) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 617 | { |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 618 | char buf[2*NAME_MAX+2]; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 619 | const char *pathname; |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 620 | unsigned char *map; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 621 | struct dso *p, temp_dso = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 622 | int fd; |
| 623 | struct stat st; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 624 | size_t alloc_size; |
| 625 | int n_th = 0; |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 626 | int is_self = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 627 | |
| 628 | /* Catch and block attempts to reload the implementation itself */ |
| 629 | if (name[0]=='l' && name[1]=='i' && name[2]=='b') { |
| 630 | static const char *rp, reserved[] = |
| 631 | "c\0pthread\0rt\0m\0dl\0util\0xnet\0"; |
| 632 | char *z = strchr(name, '.'); |
| 633 | if (z) { |
| 634 | size_t l = z-name; |
Rich Felker | 27593d3 | 2013-07-31 15:14:06 -0400 | [diff] [blame] | 635 | 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] | 636 | if (*rp) { |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 637 | if (ldd_mode) { |
| 638 | /* Track which names have been resolved |
| 639 | * and only report each one once. */ |
| 640 | static unsigned reported; |
| 641 | unsigned mask = 1U<<(rp-reserved); |
| 642 | if (!(reported & mask)) { |
| 643 | reported |= mask; |
| 644 | dprintf(1, "\t%s => %s (%p)\n", |
| 645 | name, ldso->name, |
| 646 | ldso->base); |
| 647 | } |
| 648 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 649 | is_self = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 650 | } |
| 651 | } |
| 652 | } |
Rich Felker | f8c376d | 2013-07-31 14:59:36 -0400 | [diff] [blame] | 653 | if (!strcmp(name, ldso->name)) is_self = 1; |
| 654 | if (is_self) { |
| 655 | if (!ldso->prev) { |
| 656 | tail->next = ldso; |
| 657 | ldso->prev = tail; |
| 658 | tail = ldso->next ? ldso->next : ldso; |
| 659 | } |
| 660 | return ldso; |
| 661 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 662 | if (strchr(name, '/')) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 663 | pathname = name; |
Rich Felker | f2d08cf | 2012-09-29 17:59:50 -0400 | [diff] [blame] | 664 | fd = open(name, O_RDONLY|O_CLOEXEC); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 665 | } else { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 666 | /* Search for the name to see if it's already loaded */ |
| 667 | for (p=head->next; p; p=p->next) { |
| 668 | if (p->shortname && !strcmp(p->shortname, name)) { |
| 669 | p->refcnt++; |
| 670 | return p; |
| 671 | } |
| 672 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 673 | if (strlen(name) > NAME_MAX) return 0; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 674 | fd = -1; |
Rich Felker | 3e3753c | 2013-08-02 10:02:29 -0400 | [diff] [blame] | 675 | if (env_path) fd = path_open(name, env_path, buf, sizeof buf); |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 676 | for (p=needed_by; fd < 0 && p; p=p->needed_by) |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 677 | if (!fixup_rpath(p, buf, sizeof buf)) |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 678 | fd = path_open(name, p->rpath, buf, sizeof buf); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 679 | if (fd < 0) { |
| 680 | if (!sys_path) { |
Rich Felker | f389c49 | 2013-07-18 19:29:44 -0400 | [diff] [blame] | 681 | char *prefix = 0; |
| 682 | size_t prefix_len; |
| 683 | if (ldso->name[0]=='/') { |
| 684 | char *s, *t, *z; |
| 685 | for (s=t=z=ldso->name; *s; s++) |
| 686 | if (*s=='/') z=t, t=s; |
| 687 | prefix_len = z-ldso->name; |
| 688 | if (prefix_len < PATH_MAX) |
| 689 | prefix = ldso->name; |
| 690 | } |
| 691 | if (!prefix) { |
| 692 | prefix = ""; |
| 693 | prefix_len = 0; |
| 694 | } |
| 695 | char etc_ldso_path[prefix_len + 1 |
| 696 | + sizeof "/etc/ld-musl-" LDSO_ARCH ".path"]; |
| 697 | snprintf(etc_ldso_path, sizeof etc_ldso_path, |
| 698 | "%.*s/etc/ld-musl-" LDSO_ARCH ".path", |
| 699 | (int)prefix_len, prefix); |
| 700 | FILE *f = fopen(etc_ldso_path, "rbe"); |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 701 | if (f) { |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 702 | if (getdelim(&sys_path, (size_t[1]){0}, 0, f) <= 0) { |
Rich Felker | 59b481d | 2013-06-26 10:51:36 -0400 | [diff] [blame] | 703 | free(sys_path); |
Rich Felker | 11bc173 | 2013-06-26 10:17:29 -0400 | [diff] [blame] | 704 | sys_path = ""; |
Rich Felker | 6546510 | 2012-11-09 13:49:40 -0500 | [diff] [blame] | 705 | } |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 706 | fclose(f); |
Rich Felker | ff4be70 | 2013-09-09 13:39:08 -0400 | [diff] [blame] | 707 | } else if (errno != ENOENT) { |
| 708 | sys_path = ""; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 709 | } |
| 710 | } |
Rich Felker | 40d5f7e | 2012-11-08 22:41:16 -0500 | [diff] [blame] | 711 | if (!sys_path) sys_path = "/lib:/usr/local/lib:/usr/lib"; |
| 712 | fd = path_open(name, sys_path, buf, sizeof buf); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 713 | } |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 714 | pathname = buf; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 715 | } |
| 716 | if (fd < 0) return 0; |
| 717 | if (fstat(fd, &st) < 0) { |
| 718 | close(fd); |
| 719 | return 0; |
| 720 | } |
| 721 | for (p=head->next; p; p=p->next) { |
| 722 | if (p->dev == st.st_dev && p->ino == st.st_ino) { |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 723 | /* If this library was previously loaded with a |
| 724 | * pathname but a search found the same inode, |
| 725 | * setup its shortname so it can be found by name. */ |
Rich Felker | 5f88c0e | 2012-10-05 12:09:54 -0400 | [diff] [blame] | 726 | if (!p->shortname && pathname != name) |
| 727 | p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 728 | close(fd); |
| 729 | p->refcnt++; |
| 730 | return p; |
| 731 | } |
| 732 | } |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 733 | map = noload ? 0 : map_library(fd, &temp_dso); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 734 | close(fd); |
| 735 | if (!map) return 0; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 736 | |
| 737 | /* Allocate storage for the new DSO. When there is TLS, this |
| 738 | * storage must include a reservation for all pre-existing |
| 739 | * threads to obtain copies of both the new TLS, and an |
| 740 | * extended DTV capable of storing an additional slot for |
| 741 | * the newly-loaded DSO. */ |
| 742 | alloc_size = sizeof *p + strlen(pathname) + 1; |
| 743 | if (runtime && temp_dso.tls_image) { |
| 744 | size_t per_th = temp_dso.tls_size + temp_dso.tls_align |
| 745 | + sizeof(void *) * (tls_cnt+3); |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 746 | n_th = libc.threads_minus_1 + 1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 747 | if (n_th > SSIZE_MAX / per_th) alloc_size = SIZE_MAX; |
| 748 | else alloc_size += n_th * per_th; |
| 749 | } |
| 750 | p = calloc(1, alloc_size); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 751 | if (!p) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 752 | munmap(map, temp_dso.map_len); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 753 | return 0; |
| 754 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 755 | memcpy(p, &temp_dso, sizeof temp_dso); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 756 | decode_dyn(p); |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 757 | p->dev = st.st_dev; |
| 758 | p->ino = st.st_ino; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 759 | p->refcnt = 1; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 760 | p->needed_by = needed_by; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 761 | p->name = p->buf; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 762 | strcpy(p->name, pathname); |
| 763 | /* Add a shortname only if name arg was not an explicit pathname. */ |
| 764 | if (pathname != name) p->shortname = strrchr(p->name, '/')+1; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 765 | if (p->tls_image) { |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 766 | if (runtime && !libc.has_thread_pointer) { |
Rich Felker | 74025c8 | 2013-02-02 00:59:25 -0500 | [diff] [blame] | 767 | munmap(map, p->map_len); |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 768 | free(p); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 769 | errno = ENOSYS; |
Rich Felker | 92e1cd9 | 2012-10-06 16:56:35 -0400 | [diff] [blame] | 770 | return 0; |
| 771 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 772 | p->tls_id = ++tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 773 | tls_align = MAXP2(tls_align, p->tls_align); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 774 | #ifdef TLS_ABOVE_TP |
| 775 | p->tls_offset = tls_offset + ( (tls_align-1) & |
| 776 | -(tls_offset + (uintptr_t)p->tls_image) ); |
| 777 | tls_offset += p->tls_size; |
| 778 | #else |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 779 | tls_offset += p->tls_size + p->tls_align - 1; |
| 780 | tls_offset -= (tls_offset + (uintptr_t)p->tls_image) |
| 781 | & (p->tls_align-1); |
| 782 | p->tls_offset = tls_offset; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 783 | #endif |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 784 | p->new_dtv = (void *)(-sizeof(size_t) & |
| 785 | (uintptr_t)(p->name+strlen(p->name)+sizeof(size_t))); |
| 786 | p->new_tls = (void *)(p->new_dtv + n_th*(tls_cnt+1)); |
| 787 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 788 | |
| 789 | tail->next = p; |
| 790 | p->prev = tail; |
| 791 | tail = p; |
| 792 | |
Rich Felker | 1d7c4f8 | 2012-12-15 23:34:08 -0500 | [diff] [blame] | 793 | 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] | 794 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 795 | return p; |
| 796 | } |
| 797 | |
| 798 | static void load_deps(struct dso *p) |
| 799 | { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 800 | size_t i, ndeps=0; |
| 801 | struct dso ***deps = &p->deps, **tmp, *dep; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 802 | for (; p; p=p->next) { |
| 803 | for (i=0; p->dynv[i]; i+=2) { |
| 804 | if (p->dynv[i] != DT_NEEDED) continue; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 805 | dep = load_library(p->strings + p->dynv[i+1], p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 806 | if (!dep) { |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame^] | 807 | error(errbuf, sizeof errbuf, |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 808 | "Error loading shared library %s: %m (needed by %s)", |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 809 | p->strings + p->dynv[i+1], p->name); |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 810 | continue; |
Rich Felker | 6b3d5e5 | 2011-06-26 17:39:17 -0400 | [diff] [blame] | 811 | } |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 812 | if (runtime) { |
| 813 | tmp = realloc(*deps, sizeof(*tmp)*(ndeps+2)); |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 814 | if (!tmp) longjmp(*rtld_fail, 1); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 815 | tmp[ndeps++] = dep; |
| 816 | tmp[ndeps] = 0; |
| 817 | *deps = tmp; |
| 818 | } |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 819 | } |
| 820 | } |
| 821 | } |
| 822 | |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 823 | static void load_preload(char *s) |
| 824 | { |
| 825 | int tmp; |
| 826 | char *z; |
| 827 | for (z=s; *z; s=z) { |
| 828 | for ( ; *s && isspace(*s); s++); |
| 829 | for (z=s; *z && !isspace(*z); z++); |
| 830 | tmp = *z; |
| 831 | *z = 0; |
Rich Felker | 709355e | 2013-08-23 11:15:40 -0400 | [diff] [blame] | 832 | load_library(s, 0); |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 833 | *z = tmp; |
| 834 | } |
| 835 | } |
| 836 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 837 | static void make_global(struct dso *p) |
| 838 | { |
| 839 | for (; p; p=p->next) p->global = 1; |
| 840 | } |
| 841 | |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 842 | static void reloc_all(struct dso *p) |
| 843 | { |
| 844 | size_t dyn[DYN_CNT] = {0}; |
| 845 | for (; p; p=p->next) { |
| 846 | if (p->relocated) continue; |
| 847 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | babf820 | 2012-08-05 12:50:26 -0400 | [diff] [blame] | 848 | #ifdef NEED_ARCH_RELOCS |
| 849 | do_arch_relocs(p, head); |
| 850 | #endif |
Rich Felker | 87d13a4 | 2012-08-05 02:49:02 -0400 | [diff] [blame] | 851 | do_relocs(p, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], |
| 852 | 2+(dyn[DT_PLTREL]==DT_RELA)); |
| 853 | do_relocs(p, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], 2); |
| 854 | 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] | 855 | |
| 856 | if (p->relro_start != p->relro_end && |
| 857 | mprotect(p->base+p->relro_start, p->relro_end-p->relro_start, PROT_READ) < 0) { |
Rich Felker | 7c73cac | 2014-06-18 03:05:42 -0400 | [diff] [blame^] | 858 | error(errbuf, sizeof errbuf, |
Rich Felker | 436d372 | 2014-03-25 16:23:27 -0400 | [diff] [blame] | 859 | "Error relocating %s: RELRO protection failed: %m", |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 860 | p->name); |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 861 | } |
| 862 | |
Rich Felker | 368ba4a | 2011-06-25 00:18:19 -0400 | [diff] [blame] | 863 | p->relocated = 1; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 864 | } |
| 865 | } |
| 866 | |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 867 | static void kernel_mapped_dso(struct dso *p) |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 868 | { |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 869 | size_t min_addr = -1, max_addr = 0, cnt; |
| 870 | Phdr *ph = p->phdr; |
| 871 | for (cnt = p->phnum; cnt--; ph = (void *)((char *)ph + p->phentsize)) { |
| 872 | if (ph->p_type == PT_DYNAMIC) { |
| 873 | p->dynv = (void *)(p->base + ph->p_vaddr); |
| 874 | } else if (ph->p_type == PT_GNU_RELRO) { |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 875 | p->relro_start = ph->p_vaddr & -PAGE_SIZE; |
| 876 | p->relro_end = (ph->p_vaddr + ph->p_memsz) & -PAGE_SIZE; |
| 877 | } |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 878 | if (ph->p_type != PT_LOAD) continue; |
| 879 | if (ph->p_vaddr < min_addr) |
| 880 | min_addr = ph->p_vaddr; |
| 881 | if (ph->p_vaddr+ph->p_memsz > max_addr) |
| 882 | max_addr = ph->p_vaddr+ph->p_memsz; |
| 883 | } |
| 884 | min_addr &= -PAGE_SIZE; |
| 885 | max_addr = (max_addr + PAGE_SIZE-1) & -PAGE_SIZE; |
| 886 | p->map = p->base + min_addr; |
| 887 | p->map_len = max_addr - min_addr; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 888 | p->kernel_mapped = 1; |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 889 | } |
| 890 | |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 891 | static void do_fini() |
| 892 | { |
| 893 | struct dso *p; |
| 894 | size_t dyn[DYN_CNT] = {0}; |
| 895 | for (p=fini_head; p; p=p->fini_next) { |
| 896 | if (!p->constructed) continue; |
| 897 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 898 | if (dyn[0] & (1<<DT_FINI_ARRAY)) { |
| 899 | size_t n = dyn[DT_FINI_ARRAYSZ]/sizeof(size_t); |
Rich Felker | 1b41357 | 2013-07-21 02:35:46 -0400 | [diff] [blame] | 900 | size_t *fn = (size_t *)(p->base + dyn[DT_FINI_ARRAY])+n; |
| 901 | while (n--) ((void (*)(void))*--fn)(); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 902 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 903 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 904 | if ((dyn[0] & (1<<DT_FINI)) && dyn[DT_FINI]) |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 905 | ((void (*)(void))(p->base + dyn[DT_FINI]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 906 | #endif |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 907 | } |
| 908 | } |
| 909 | |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 910 | static void do_init_fini(struct dso *p) |
| 911 | { |
| 912 | size_t dyn[DYN_CNT] = {0}; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 913 | int need_locking = libc.threads_minus_1; |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 914 | /* Allow recursive calls that arise when a library calls |
| 915 | * dlopen from one of its constructors, but block any |
| 916 | * other threads until all ctors have finished. */ |
| 917 | if (need_locking) pthread_mutex_lock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 918 | for (; p; p=p->prev) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 919 | if (p->constructed) continue; |
| 920 | p->constructed = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 921 | decode_vec(p->dynv, dyn, DYN_CNT); |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 922 | if (dyn[0] & ((1<<DT_FINI) | (1<<DT_FINI_ARRAY))) { |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 923 | p->fini_next = fini_head; |
| 924 | fini_head = p; |
| 925 | } |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 926 | #ifndef NO_LEGACY_INITFINI |
Rich Felker | d0c6cb0 | 2013-07-31 00:04:10 -0400 | [diff] [blame] | 927 | if ((dyn[0] & (1<<DT_INIT)) && dyn[DT_INIT]) |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 928 | ((void (*)(void))(p->base + dyn[DT_INIT]))(); |
Rich Felker | 1da53da | 2013-07-22 14:08:33 -0400 | [diff] [blame] | 929 | #endif |
Rich Felker | e69ae84 | 2013-07-20 18:26:17 -0400 | [diff] [blame] | 930 | if (dyn[0] & (1<<DT_INIT_ARRAY)) { |
| 931 | size_t n = dyn[DT_INIT_ARRAYSZ]/sizeof(size_t); |
| 932 | size_t *fn = (void *)(p->base + dyn[DT_INIT_ARRAY]); |
| 933 | while (n--) ((void (*)(void))*fn++)(); |
| 934 | } |
Rich Felker | 509b50e | 2013-06-29 02:24:02 -0400 | [diff] [blame] | 935 | if (!need_locking && libc.threads_minus_1) { |
| 936 | need_locking = 1; |
| 937 | pthread_mutex_lock(&init_fini_lock); |
| 938 | } |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 939 | } |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 940 | if (need_locking) pthread_mutex_unlock(&init_fini_lock); |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 941 | } |
| 942 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 943 | void _dl_debug_state(void) |
| 944 | { |
| 945 | } |
| 946 | |
Rich Felker | 7c6c290 | 2013-08-03 16:27:30 -0400 | [diff] [blame] | 947 | void __reset_tls() |
| 948 | { |
| 949 | pthread_t self = __pthread_self(); |
| 950 | struct dso *p; |
| 951 | for (p=head; p; p=p->next) { |
| 952 | if (!p->tls_id || !self->dtv[p->tls_id]) continue; |
| 953 | memcpy(self->dtv[p->tls_id], p->tls_image, p->tls_len); |
| 954 | memset((char *)self->dtv[p->tls_id]+p->tls_len, 0, |
| 955 | p->tls_size - p->tls_len); |
| 956 | if (p->tls_id == (size_t)self->dtv[0]) break; |
| 957 | } |
| 958 | } |
| 959 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 960 | void *__copy_tls(unsigned char *mem) |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 961 | { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 962 | pthread_t td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 963 | struct dso *p; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 964 | |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 965 | void **dtv = (void *)mem; |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 966 | dtv[0] = (void *)tls_cnt; |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 967 | if (!tls_cnt) { |
| 968 | td = (void *)(dtv+1); |
| 969 | td->dtv = dtv; |
| 970 | return td; |
| 971 | } |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 972 | |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 973 | #ifdef TLS_ABOVE_TP |
| 974 | mem += sizeof(void *) * (tls_cnt+1); |
| 975 | mem += -((uintptr_t)mem + sizeof(struct pthread)) & (tls_align-1); |
| 976 | td = (pthread_t)mem; |
| 977 | mem += sizeof(struct pthread); |
| 978 | |
| 979 | for (p=head; p; p=p->next) { |
| 980 | if (!p->tls_id) continue; |
| 981 | dtv[p->tls_id] = mem + p->tls_offset; |
| 982 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
| 983 | } |
| 984 | #else |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 985 | mem += libc.tls_size - sizeof(struct pthread); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 986 | mem -= (uintptr_t)mem & (tls_align-1); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 987 | td = (pthread_t)mem; |
| 988 | |
| 989 | for (p=head; p; p=p->next) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 990 | if (!p->tls_id) continue; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 991 | dtv[p->tls_id] = mem - p->tls_offset; |
| 992 | memcpy(dtv[p->tls_id], p->tls_image, p->tls_len); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 993 | } |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 994 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 995 | td->dtv = dtv; |
| 996 | return td; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 997 | } |
| 998 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 999 | void *__tls_get_addr(size_t *v) |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1000 | { |
| 1001 | pthread_t self = __pthread_self(); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1002 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1003 | return (char *)self->dtv[v[0]]+v[1]; |
| 1004 | |
| 1005 | /* Block signals to make accessing new TLS async-signal-safe */ |
| 1006 | sigset_t set; |
Rich Felker | 00902c7 | 2012-10-06 23:57:51 -0400 | [diff] [blame] | 1007 | pthread_sigmask(SIG_BLOCK, SIGALL_SET, &set); |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1008 | if (v[0]<=(size_t)self->dtv[0] && self->dtv[v[0]]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1009 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 1010 | return (char *)self->dtv[v[0]]+v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1011 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1012 | |
| 1013 | /* This is safe without any locks held because, if the caller |
| 1014 | * is able to request the Nth entry of the DTV, the DSO list |
| 1015 | * must be valid at least that far out and it was synchronized |
| 1016 | * at program startup or by an already-completed call to dlopen. */ |
| 1017 | struct dso *p; |
| 1018 | for (p=head; p->tls_id != v[0]; p=p->next); |
| 1019 | |
| 1020 | /* Get new DTV space from new DSO if needed */ |
Rich Felker | 44b4d09 | 2013-06-03 16:35:59 -0400 | [diff] [blame] | 1021 | if (v[0] > (size_t)self->dtv[0]) { |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1022 | void **newdtv = p->new_dtv + |
| 1023 | (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] | 1024 | memcpy(newdtv, self->dtv, |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1025 | ((size_t)self->dtv[0]+1) * sizeof(void *)); |
| 1026 | newdtv[0] = (void *)v[0]; |
| 1027 | self->dtv = newdtv; |
| 1028 | } |
| 1029 | |
| 1030 | /* Get new TLS memory from new DSO */ |
| 1031 | unsigned char *mem = p->new_tls + |
| 1032 | (p->tls_size + p->tls_align) * a_fetch_add(&p->new_tls_idx,1); |
| 1033 | mem += ((uintptr_t)p->tls_image - (uintptr_t)mem) & (p->tls_align-1); |
| 1034 | self->dtv[v[0]] = mem; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1035 | memcpy(mem, p->tls_image, p->tls_len); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1036 | pthread_sigmask(SIG_SETMASK, &set, 0); |
| 1037 | return mem + v[1]; |
Rich Felker | 9b153c0 | 2012-10-04 21:01:56 -0400 | [diff] [blame] | 1038 | } |
| 1039 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1040 | static void update_tls_size() |
| 1041 | { |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1042 | libc.tls_size = ALIGN( |
| 1043 | (1+tls_cnt) * sizeof(void *) + |
| 1044 | tls_offset + |
| 1045 | sizeof(struct pthread) + |
| 1046 | tls_align * 2, |
| 1047 | tls_align); |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1048 | } |
| 1049 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1050 | void *__dynlink(int argc, char **argv) |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1051 | { |
Rich Felker | 731e8ff | 2012-08-25 17:24:46 -0400 | [diff] [blame] | 1052 | size_t aux[AUX_CNT] = {0}; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1053 | size_t i; |
| 1054 | Phdr *phdr; |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1055 | Ehdr *ehdr; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1056 | static struct dso builtin_dsos[3]; |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1057 | struct dso *const app = builtin_dsos+0; |
| 1058 | struct dso *const lib = builtin_dsos+1; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1059 | struct dso *const vdso = builtin_dsos+2; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1060 | char *env_preload=0; |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1061 | size_t vdso_base; |
Rich Felker | 2f2f115 | 2012-11-01 23:49:57 -0400 | [diff] [blame] | 1062 | size_t *auxv; |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1063 | char **envp = argv+argc+1; |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1064 | void *initial_tls; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1065 | |
| 1066 | /* Find aux vector just past environ[] */ |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1067 | for (i=argc+1; argv[i]; i++) |
| 1068 | if (!memcmp(argv[i], "LD_LIBRARY_PATH=", 16)) |
| 1069 | env_path = argv[i]+16; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1070 | else if (!memcmp(argv[i], "LD_PRELOAD=", 11)) |
| 1071 | env_preload = argv[i]+11; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1072 | auxv = (void *)(argv+i+1); |
| 1073 | |
| 1074 | decode_vec(auxv, aux, AUX_CNT); |
| 1075 | |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1076 | /* Only trust user/env if kernel says we're not suid/sgid */ |
| 1077 | if ((aux[0]&0x7800)!=0x7800 || aux[AT_UID]!=aux[AT_EUID] |
Rich Felker | a045883 | 2011-08-16 07:46:42 -0400 | [diff] [blame] | 1078 | || aux[AT_GID]!=aux[AT_EGID] || aux[AT_SECURE]) { |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1079 | env_path = 0; |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1080 | env_preload = 0; |
Rich Felker | a897a20 | 2013-08-23 13:56:30 -0400 | [diff] [blame] | 1081 | libc.secure = 1; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1082 | } |
Szabolcs Nagy | b20760c | 2013-09-15 02:00:32 +0000 | [diff] [blame] | 1083 | libc.page_size = aux[AT_PAGESZ]; |
Rich Felker | 568b807 | 2011-06-25 01:56:34 -0400 | [diff] [blame] | 1084 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1085 | /* If the dynamic linker was invoked as a program itself, AT_BASE |
| 1086 | * will not be set. In that case, we assume the base address is |
| 1087 | * the start of the page containing the PHDRs; I don't know any |
| 1088 | * better approach... */ |
| 1089 | if (!aux[AT_BASE]) { |
| 1090 | aux[AT_BASE] = aux[AT_PHDR] & -PAGE_SIZE; |
| 1091 | aux[AT_PHDR] = aux[AT_PHENT] = aux[AT_PHNUM] = 0; |
| 1092 | } |
| 1093 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1094 | /* The dynamic linker load address is passed by the kernel |
| 1095 | * in the AUX vector, so this is easy. */ |
| 1096 | lib->base = (void *)aux[AT_BASE]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1097 | lib->name = lib->shortname = "libc.so"; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1098 | lib->global = 1; |
| 1099 | ehdr = (void *)lib->base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1100 | lib->phnum = ehdr->e_phnum; |
| 1101 | lib->phdr = (void *)(aux[AT_BASE]+ehdr->e_phoff); |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1102 | lib->phentsize = ehdr->e_phentsize; |
| 1103 | kernel_mapped_dso(lib); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1104 | decode_dyn(lib); |
| 1105 | |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1106 | if (aux[AT_PHDR]) { |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1107 | size_t interp_off = 0; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1108 | size_t tls_image = 0; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1109 | /* 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] | 1110 | app->phdr = phdr = (void *)aux[AT_PHDR]; |
| 1111 | app->phnum = aux[AT_PHNUM]; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1112 | app->phentsize = aux[AT_PHENT]; |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1113 | for (i=aux[AT_PHNUM]; i; i--, phdr=(void *)((char *)phdr + aux[AT_PHENT])) { |
| 1114 | if (phdr->p_type == PT_PHDR) |
| 1115 | app->base = (void *)(aux[AT_PHDR] - phdr->p_vaddr); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1116 | else if (phdr->p_type == PT_INTERP) |
| 1117 | interp_off = (size_t)phdr->p_vaddr; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1118 | else if (phdr->p_type == PT_TLS) { |
| 1119 | tls_image = phdr->p_vaddr; |
| 1120 | app->tls_len = phdr->p_filesz; |
| 1121 | app->tls_size = phdr->p_memsz; |
| 1122 | app->tls_align = phdr->p_align; |
| 1123 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1124 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1125 | if (app->tls_size) app->tls_image = (char *)app->base + tls_image; |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1126 | if (interp_off) lib->name = (char *)app->base + interp_off; |
Rich Felker | cc51505 | 2013-08-23 14:14:47 -0400 | [diff] [blame] | 1127 | if ((aux[0] & (1UL<<AT_EXECFN)) |
| 1128 | && strncmp((char *)aux[AT_EXECFN], "/proc/", 6)) |
| 1129 | app->name = (char *)aux[AT_EXECFN]; |
| 1130 | else |
| 1131 | app->name = argv[0]; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1132 | kernel_mapped_dso(app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1133 | } else { |
| 1134 | int fd; |
| 1135 | char *ldname = argv[0]; |
Rich Felker | a617a8e | 2012-11-01 23:46:39 -0400 | [diff] [blame] | 1136 | size_t l = strlen(ldname); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1137 | if (l >= 3 && !strcmp(ldname+l-3, "ldd")) ldd_mode = 1; |
| 1138 | *argv++ = (void *)-1; |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1139 | while (argv[0] && argv[0][0]=='-' && argv[0][1]=='-') { |
| 1140 | char *opt = argv[0]+2; |
| 1141 | *argv++ = (void *)-1; |
| 1142 | if (!*opt) { |
| 1143 | break; |
| 1144 | } else if (!memcmp(opt, "list", 5)) { |
| 1145 | ldd_mode = 1; |
| 1146 | } else if (!memcmp(opt, "library-path", 12)) { |
| 1147 | if (opt[12]=='=') env_path = opt+13; |
| 1148 | else if (opt[12]) *argv = 0; |
| 1149 | else if (*argv) env_path = *argv++; |
| 1150 | } else if (!memcmp(opt, "preload", 7)) { |
| 1151 | if (opt[7]=='=') env_preload = opt+8; |
| 1152 | else if (opt[7]) *argv = 0; |
| 1153 | else if (*argv) env_preload = *argv++; |
| 1154 | } else { |
| 1155 | argv[0] = 0; |
| 1156 | } |
| 1157 | argv[-1] = (void *)-1; |
| 1158 | } |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1159 | if (!argv[0]) { |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1160 | dprintf(2, "musl libc\n" |
| 1161 | "Version %s\n" |
| 1162 | "Dynamic Program Loader\n" |
Rich Felker | de45164 | 2014-04-16 12:45:36 -0400 | [diff] [blame] | 1163 | "Usage: %s [options] [--] pathname%s\n", |
Rich Felker | 179ab5a | 2013-12-01 17:27:25 -0500 | [diff] [blame] | 1164 | __libc_get_version(), ldname, |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1165 | ldd_mode ? "" : " [args]"); |
| 1166 | _exit(1); |
| 1167 | } |
| 1168 | fd = open(argv[0], O_RDONLY); |
| 1169 | if (fd < 0) { |
| 1170 | dprintf(2, "%s: cannot load %s: %s\n", ldname, argv[0], strerror(errno)); |
| 1171 | _exit(1); |
| 1172 | } |
| 1173 | runtime = 1; |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1174 | ehdr = (void *)map_library(fd, app); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1175 | if (!ehdr) { |
| 1176 | dprintf(2, "%s: %s: Not a valid dynamic program\n", ldname, argv[0]); |
| 1177 | _exit(1); |
| 1178 | } |
| 1179 | runtime = 0; |
| 1180 | close(fd); |
Rich Felker | 649cec5 | 2012-07-13 01:31:02 -0400 | [diff] [blame] | 1181 | lib->name = ldname; |
Rich Felker | 0420b87 | 2012-07-11 01:41:20 -0400 | [diff] [blame] | 1182 | app->name = argv[0]; |
Rich Felker | 876748e | 2013-07-26 14:25:51 -0400 | [diff] [blame] | 1183 | aux[AT_ENTRY] = (size_t)app->base + ehdr->e_entry; |
Rich Felker | a97a050 | 2013-07-26 14:41:12 -0400 | [diff] [blame] | 1184 | /* Find the name that would have been used for the dynamic |
| 1185 | * linker had ldd not taken its place. */ |
| 1186 | if (ldd_mode) { |
| 1187 | for (i=0; i<app->phnum; i++) { |
| 1188 | if (app->phdr[i].p_type == PT_INTERP) |
| 1189 | lib->name = (void *)(app->base |
| 1190 | + app->phdr[i].p_vaddr); |
| 1191 | } |
| 1192 | dprintf(1, "\t%s (%p)\n", lib->name, lib->base); |
| 1193 | } |
Rich Felker | e12fe65 | 2012-01-23 02:02:59 -0500 | [diff] [blame] | 1194 | } |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1195 | if (app->tls_size) { |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1196 | app->tls_id = tls_cnt = 1; |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1197 | #ifdef TLS_ABOVE_TP |
| 1198 | app->tls_offset = 0; |
| 1199 | tls_offset = app->tls_size |
| 1200 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1201 | & (app->tls_align-1) ); |
| 1202 | #else |
Rich Felker | c62b9f3 | 2012-10-14 19:56:50 -0400 | [diff] [blame] | 1203 | tls_offset = app->tls_offset = app->tls_size |
| 1204 | + ( -((uintptr_t)app->tls_image + app->tls_size) |
| 1205 | & (app->tls_align-1) ); |
Rich Felker | 9ec4283 | 2012-10-15 18:51:53 -0400 | [diff] [blame] | 1206 | #endif |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1207 | tls_align = MAXP2(tls_align, app->tls_align); |
Rich Felker | bc6a35f | 2012-10-04 20:04:13 -0400 | [diff] [blame] | 1208 | } |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1209 | app->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1210 | decode_dyn(app); |
| 1211 | |
| 1212 | /* Attach to vdso, if provided by the kernel */ |
Rich Felker | dbcb3ad | 2012-08-25 17:31:59 -0400 | [diff] [blame] | 1213 | if (search_vec(auxv, &vdso_base, AT_SYSINFO_EHDR)) { |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1214 | ehdr = (void *)vdso_base; |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1215 | vdso->phdr = phdr = (void *)(vdso_base + ehdr->e_phoff); |
| 1216 | vdso->phnum = ehdr->e_phnum; |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1217 | vdso->phentsize = ehdr->e_phentsize; |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1218 | for (i=ehdr->e_phnum; i; i--, phdr=(void *)((char *)phdr + ehdr->e_phentsize)) { |
| 1219 | if (phdr->p_type == PT_DYNAMIC) |
| 1220 | vdso->dynv = (void *)(vdso_base + phdr->p_offset); |
| 1221 | if (phdr->p_type == PT_LOAD) |
| 1222 | vdso->base = (void *)(vdso_base - phdr->p_vaddr + phdr->p_offset); |
| 1223 | } |
Rich Felker | 75a31fa | 2012-11-25 20:56:31 -0500 | [diff] [blame] | 1224 | vdso->name = ""; |
| 1225 | vdso->shortname = "linux-gate.so.1"; |
Rich Felker | 427173b | 2011-07-24 02:19:47 -0400 | [diff] [blame] | 1226 | vdso->global = 1; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1227 | decode_dyn(vdso); |
Rich Felker | 6ab444d | 2011-07-24 00:54:55 -0400 | [diff] [blame] | 1228 | vdso->prev = lib; |
| 1229 | lib->next = vdso; |
| 1230 | } |
| 1231 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1232 | /* Initial dso chain consists only of the app. We temporarily |
| 1233 | * append the dynamic linker/libc so we can relocate it, then |
| 1234 | * restore the initial chain in preparation for loading third |
| 1235 | * party libraries (preload/needed). */ |
| 1236 | head = tail = app; |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1237 | ldso = lib; |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1238 | app->next = lib; |
| 1239 | reloc_all(lib); |
| 1240 | app->next = 0; |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1241 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1242 | /* PAST THIS POINT, ALL LIBC INTERFACES ARE FULLY USABLE. */ |
Rich Felker | 51e2d83 | 2011-06-18 19:48:42 -0400 | [diff] [blame] | 1243 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1244 | /* Donate unused parts of app and library mapping to malloc */ |
Timo Teräs | 8769196 | 2014-03-25 20:59:50 +0200 | [diff] [blame] | 1245 | reclaim_gaps(app); |
| 1246 | reclaim_gaps(lib); |
Rich Felker | 6717e62 | 2011-06-28 19:40:14 -0400 | [diff] [blame] | 1247 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1248 | /* Load preload/needed libraries, add their symbols to the global |
Rich Felker | fd7015d | 2012-01-23 18:32:40 -0500 | [diff] [blame] | 1249 | * namespace, and perform all remaining relocations. The main |
| 1250 | * program must be relocated LAST since it may contain copy |
| 1251 | * relocations which depend on libraries' relocations. */ |
Rich Felker | 2719cc8 | 2011-08-16 00:24:36 -0400 | [diff] [blame] | 1252 | if (env_preload) load_preload(env_preload); |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1253 | load_deps(app); |
| 1254 | make_global(app); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1255 | |
Timo Teräs | e13a2b8 | 2014-03-25 14:13:27 +0200 | [diff] [blame] | 1256 | #ifndef DYNAMIC_IS_RO |
| 1257 | for (i=0; app->dynv[i]; i+=2) |
| 1258 | if (app->dynv[i]==DT_DEBUG) |
| 1259 | app->dynv[i+1] = (size_t)&debug; |
| 1260 | #endif |
| 1261 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1262 | reloc_all(app->next); |
| 1263 | reloc_all(app); |
| 1264 | |
| 1265 | update_tls_size(); |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1266 | if (libc.tls_size > sizeof builtin_tls) { |
| 1267 | initial_tls = calloc(libc.tls_size, 1); |
| 1268 | if (!initial_tls) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1269 | dprintf(2, "%s: Error getting %zu bytes thread-local storage: %m\n", |
Rich Felker | e23d358 | 2012-10-13 23:25:20 -0400 | [diff] [blame] | 1270 | argv[0], libc.tls_size); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1271 | _exit(127); |
| 1272 | } |
Rich Felker | dab441a | 2014-03-24 16:57:11 -0400 | [diff] [blame] | 1273 | } else { |
| 1274 | initial_tls = builtin_tls; |
| 1275 | } |
| 1276 | if (__init_tp(__copy_tls(initial_tls)) < 0 && tls_cnt) { |
| 1277 | dprintf(2, "%s: Thread-local storage not supported by kernel.\n", argv[0]); |
| 1278 | _exit(127); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1279 | } |
| 1280 | |
Rich Felker | 0410950 | 2012-08-18 16:00:23 -0400 | [diff] [blame] | 1281 | if (ldso_fail) _exit(127); |
Rich Felker | 5c1909a | 2012-05-27 16:01:44 -0400 | [diff] [blame] | 1282 | if (ldd_mode) _exit(0); |
| 1283 | |
Rich Felker | c82f4a3 | 2012-01-23 00:57:38 -0500 | [diff] [blame] | 1284 | /* Switch to runtime mode: any further failures in the dynamic |
| 1285 | * linker are a reportable failure rather than a fatal startup |
| 1286 | * error. If the dynamic loader (dlopen) will not be used, free |
| 1287 | * all memory used by the dynamic linker. */ |
Rich Felker | a53de81 | 2011-07-24 00:26:12 -0400 | [diff] [blame] | 1288 | runtime = 1; |
Rich Felker | 4ce3cb5 | 2012-02-06 14:39:09 -0500 | [diff] [blame] | 1289 | |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1290 | debug.ver = 1; |
| 1291 | debug.bp = _dl_debug_state; |
| 1292 | debug.head = head; |
| 1293 | debug.base = lib->base; |
| 1294 | debug.state = 0; |
| 1295 | _dl_debug_state(); |
| 1296 | |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1297 | __init_libc(envp, argv[0]); |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1298 | atexit(do_fini); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1299 | errno = 0; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1300 | do_init_fini(tail); |
Rich Felker | 7586360 | 2013-07-21 03:00:54 -0400 | [diff] [blame] | 1301 | |
| 1302 | return (void *)aux[AT_ENTRY]; |
Rich Felker | a7936f6 | 2012-11-30 17:56:23 -0500 | [diff] [blame] | 1303 | } |
| 1304 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1305 | void *dlopen(const char *file, int mode) |
| 1306 | { |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1307 | struct dso *volatile p, *orig_tail, *next; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1308 | size_t orig_tls_cnt, orig_tls_offset, orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1309 | size_t i; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1310 | int cs; |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1311 | jmp_buf jb; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1312 | |
| 1313 | if (!file) return head; |
| 1314 | |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1315 | pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1316 | pthread_rwlock_wrlock(&lock); |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1317 | __inhibit_ptc(); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1318 | |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1319 | p = 0; |
| 1320 | orig_tls_cnt = tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1321 | orig_tls_offset = tls_offset; |
| 1322 | orig_tls_align = tls_align; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1323 | orig_tail = tail; |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1324 | noload = mode & RTLD_NOLOAD; |
Rich Felker | 642b759 | 2012-10-05 01:15:25 -0400 | [diff] [blame] | 1325 | |
Rich Felker | 17276be | 2013-07-24 02:38:05 -0400 | [diff] [blame] | 1326 | rtld_fail = &jb; |
| 1327 | if (setjmp(*rtld_fail)) { |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1328 | /* Clean up anything new that was (partially) loaded */ |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1329 | if (p && p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1330 | if (p->deps[i]->global < 0) |
| 1331 | p->deps[i]->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1332 | for (p=orig_tail->next; p; p=next) { |
| 1333 | next = p->next; |
| 1334 | munmap(p->map, p->map_len); |
| 1335 | free(p->deps); |
| 1336 | free(p); |
| 1337 | } |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1338 | tls_cnt = orig_tls_cnt; |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1339 | tls_offset = orig_tls_offset; |
| 1340 | tls_align = orig_tls_align; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1341 | tail = orig_tail; |
| 1342 | tail->next = 0; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1343 | p = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1344 | errflag = 1; |
| 1345 | goto end; |
Rich Felker | 0f9b1f6 | 2013-08-23 23:13:25 -0400 | [diff] [blame] | 1346 | } else p = load_library(file, head); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1347 | |
| 1348 | if (!p) { |
Rich Felker | 4d07e55 | 2013-01-23 22:07:45 -0500 | [diff] [blame] | 1349 | snprintf(errbuf, sizeof errbuf, noload ? |
| 1350 | "Library %s is not already loaded" : |
| 1351 | "Error loading shared library %s: %m", |
| 1352 | file); |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1353 | errflag = 1; |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1354 | goto end; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1355 | } |
| 1356 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1357 | /* First load handling */ |
| 1358 | if (!p->deps) { |
| 1359 | load_deps(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1360 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1361 | if (!p->deps[i]->global) |
| 1362 | p->deps[i]->global = -1; |
| 1363 | if (!p->global) p->global = -1; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1364 | reloc_all(p); |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1365 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 92ab5d8 | 2011-06-26 21:21:04 -0400 | [diff] [blame] | 1366 | if (p->deps[i]->global < 0) |
| 1367 | p->deps[i]->global = 0; |
| 1368 | if (p->global < 0) p->global = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1369 | } |
| 1370 | |
| 1371 | if (mode & RTLD_GLOBAL) { |
Rich Felker | 0e4dae3 | 2011-06-26 21:36:44 -0400 | [diff] [blame] | 1372 | if (p->deps) for (i=0; p->deps[i]; i++) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1373 | p->deps[i]->global = 1; |
| 1374 | p->global = 1; |
| 1375 | } |
| 1376 | |
Rich Felker | cf3fd3d | 2012-10-06 01:22:51 -0400 | [diff] [blame] | 1377 | update_tls_size(); |
Rich Felker | 3ec8d29 | 2012-04-25 00:05:42 -0400 | [diff] [blame] | 1378 | _dl_debug_state(); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1379 | orig_tail = tail; |
Rich Felker | 06933cc | 2011-06-26 22:09:32 -0400 | [diff] [blame] | 1380 | end: |
Rich Felker | dcd6037 | 2012-10-05 11:51:50 -0400 | [diff] [blame] | 1381 | __release_ptc(); |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1382 | if (p) gencnt++; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1383 | pthread_rwlock_unlock(&lock); |
Rich Felker | f4f77c0 | 2012-10-05 13:09:09 -0400 | [diff] [blame] | 1384 | if (p) do_init_fini(orig_tail); |
Rich Felker | f2baf4d | 2012-02-07 20:31:27 -0500 | [diff] [blame] | 1385 | pthread_setcancelstate(cs, 0); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1386 | return p; |
| 1387 | } |
| 1388 | |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1389 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1390 | { |
| 1391 | struct dso *p; |
| 1392 | for (p=head; p; p=p->next) if (h==p) return 0; |
| 1393 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1394 | errflag = 1; |
| 1395 | return 1; |
| 1396 | } |
| 1397 | |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1398 | static void *do_dlsym(struct dso *p, const char *s, void *ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1399 | { |
| 1400 | size_t i; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1401 | uint32_t h = 0, gh = 0; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1402 | Sym *sym; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1403 | if (p == head || p == RTLD_DEFAULT || p == RTLD_NEXT) { |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1404 | if (p == RTLD_DEFAULT) { |
| 1405 | p = head; |
| 1406 | } else if (p == RTLD_NEXT) { |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1407 | for (p=head; p && (unsigned char *)ra-p->map>p->map_len; p=p->next); |
| 1408 | if (!p) p=head; |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1409 | p = p->next; |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1410 | } |
Rich Felker | deb15b3 | 2012-10-19 21:41:30 -0400 | [diff] [blame] | 1411 | struct symdef def = find_sym(p, s, 0); |
Rich Felker | 9c74856 | 2012-10-04 22:48:33 -0400 | [diff] [blame] | 1412 | if (!def.sym) goto failed; |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1413 | if ((def.sym->st_info&0xf) == STT_TLS) |
| 1414 | 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] | 1415 | return def.dso->base + def.sym->st_value; |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1416 | } |
Rich Felker | 637dd2d | 2013-01-23 20:21:36 -0500 | [diff] [blame] | 1417 | if (p != RTLD_DEFAULT && p != RTLD_NEXT && invalid_dso_handle(p)) |
| 1418 | return 0; |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1419 | if (p->ghashtab) { |
| 1420 | gh = gnu_hash(s); |
| 1421 | sym = gnu_lookup(s, gh, p); |
| 1422 | } else { |
| 1423 | h = sysv_hash(s); |
| 1424 | sym = sysv_lookup(s, h, p); |
| 1425 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1426 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1427 | return __tls_get_addr((size_t []){p->tls_id, sym->st_value}); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1428 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1429 | return p->base + sym->st_value; |
| 1430 | if (p->deps) for (i=0; p->deps[i]; i++) { |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1431 | if (p->deps[i]->ghashtab) { |
| 1432 | if (!gh) gh = gnu_hash(s); |
Rich Felker | a5d6199 | 2012-08-25 17:40:27 -0400 | [diff] [blame] | 1433 | sym = gnu_lookup(s, gh, p->deps[i]); |
Rich Felker | 2bd05a4 | 2012-08-25 17:13:28 -0400 | [diff] [blame] | 1434 | } else { |
| 1435 | if (!h) h = sysv_hash(s); |
| 1436 | sym = sysv_lookup(s, h, p->deps[i]); |
| 1437 | } |
Rich Felker | 0a1c2c1 | 2012-10-19 21:57:56 -0400 | [diff] [blame] | 1438 | if (sym && (sym->st_info&0xf) == STT_TLS) |
| 1439 | 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] | 1440 | if (sym && sym->st_value && (1<<(sym->st_info&0xf) & OK_TYPES)) |
| 1441 | return p->deps[i]->base + sym->st_value; |
| 1442 | } |
Rich Felker | 4027f4e | 2012-05-04 20:18:18 -0400 | [diff] [blame] | 1443 | failed: |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1444 | errflag = 1; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1445 | snprintf(errbuf, sizeof errbuf, "Symbol not found: %s", s); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1446 | return 0; |
| 1447 | } |
| 1448 | |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1449 | int __dladdr(const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1450 | { |
| 1451 | struct dso *p; |
| 1452 | Sym *sym; |
| 1453 | uint32_t nsym; |
| 1454 | char *strings; |
| 1455 | size_t i; |
| 1456 | void *best = 0; |
| 1457 | char *bestname; |
| 1458 | |
| 1459 | pthread_rwlock_rdlock(&lock); |
| 1460 | for (p=head; p && (unsigned char *)addr-p->map>p->map_len; p=p->next); |
| 1461 | pthread_rwlock_unlock(&lock); |
| 1462 | |
| 1463 | if (!p) return 0; |
| 1464 | |
| 1465 | sym = p->syms; |
| 1466 | strings = p->strings; |
| 1467 | if (p->hashtab) { |
| 1468 | nsym = p->hashtab[1]; |
| 1469 | } else { |
| 1470 | uint32_t *buckets; |
| 1471 | uint32_t *hashval; |
| 1472 | buckets = p->ghashtab + 4 + (p->ghashtab[2]*sizeof(size_t)/4); |
| 1473 | sym += p->ghashtab[1]; |
Rich Felker | 7886985 | 2013-10-04 00:29:58 -0400 | [diff] [blame] | 1474 | for (i = nsym = 0; i < p->ghashtab[0]; i++) { |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1475 | if (buckets[i] > nsym) |
| 1476 | nsym = buckets[i]; |
| 1477 | } |
| 1478 | if (nsym) { |
| 1479 | nsym -= p->ghashtab[1]; |
| 1480 | hashval = buckets + p->ghashtab[0] + nsym; |
| 1481 | do nsym++; |
| 1482 | while (!(*hashval++ & 1)); |
| 1483 | } |
| 1484 | } |
| 1485 | |
| 1486 | for (; nsym; nsym--, sym++) { |
Rich Felker | cdc5c74 | 2013-01-16 11:47:35 -0500 | [diff] [blame] | 1487 | if (sym->st_value |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1488 | && (1<<(sym->st_info&0xf) & OK_TYPES) |
| 1489 | && (1<<(sym->st_info>>4) & OK_BINDS)) { |
| 1490 | void *symaddr = p->base + sym->st_value; |
| 1491 | if (symaddr > addr || symaddr < best) |
| 1492 | continue; |
| 1493 | best = symaddr; |
| 1494 | bestname = strings + sym->st_name; |
| 1495 | if (addr == symaddr) |
| 1496 | break; |
| 1497 | } |
| 1498 | } |
| 1499 | |
| 1500 | if (!best) return 0; |
| 1501 | |
| 1502 | info->dli_fname = p->name; |
| 1503 | info->dli_fbase = p->base; |
| 1504 | info->dli_sname = bestname; |
| 1505 | info->dli_saddr = best; |
| 1506 | |
| 1507 | return 1; |
| 1508 | } |
| 1509 | |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1510 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1511 | { |
| 1512 | void *res; |
| 1513 | pthread_rwlock_rdlock(&lock); |
Rich Felker | 623753a | 2011-08-16 00:42:13 -0400 | [diff] [blame] | 1514 | res = do_dlsym(p, s, ra); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1515 | pthread_rwlock_unlock(&lock); |
| 1516 | return res; |
| 1517 | } |
Rich Felker | 18c0e02 | 2012-10-31 21:27:48 -0400 | [diff] [blame] | 1518 | |
| 1519 | int dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data) |
| 1520 | { |
| 1521 | struct dso *current; |
| 1522 | struct dl_phdr_info info; |
| 1523 | int ret = 0; |
| 1524 | for(current = head; current;) { |
| 1525 | info.dlpi_addr = (uintptr_t)current->base; |
| 1526 | info.dlpi_name = current->name; |
| 1527 | info.dlpi_phdr = current->phdr; |
| 1528 | info.dlpi_phnum = current->phnum; |
| 1529 | info.dlpi_adds = gencnt; |
| 1530 | info.dlpi_subs = 0; |
| 1531 | info.dlpi_tls_modid = current->tls_id; |
| 1532 | info.dlpi_tls_data = current->tls_image; |
| 1533 | |
| 1534 | ret = (callback)(&info, sizeof (info), data); |
| 1535 | |
| 1536 | if (ret != 0) break; |
| 1537 | |
| 1538 | pthread_rwlock_rdlock(&lock); |
| 1539 | current = current->next; |
| 1540 | pthread_rwlock_unlock(&lock); |
| 1541 | } |
| 1542 | return ret; |
| 1543 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1544 | #else |
Rich Felker | 4d98280 | 2013-01-16 11:49:00 -0500 | [diff] [blame] | 1545 | static int invalid_dso_handle(void *h) |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1546 | { |
| 1547 | snprintf(errbuf, sizeof errbuf, "Invalid library handle %p", (void *)h); |
| 1548 | errflag = 1; |
| 1549 | return 1; |
| 1550 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1551 | void *dlopen(const char *file, int mode) |
| 1552 | { |
| 1553 | return 0; |
| 1554 | } |
Rich Felker | 400c5e5 | 2012-09-06 22:44:55 -0400 | [diff] [blame] | 1555 | void *__dlsym(void *restrict p, const char *restrict s, void *restrict ra) |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1556 | { |
| 1557 | return 0; |
| 1558 | } |
Rich Felker | 839cc4e | 2014-01-06 22:03:38 -0500 | [diff] [blame] | 1559 | int __dladdr (const void *addr, Dl_info *info) |
Rich Felker | f419bcb | 2012-08-26 21:09:26 -0400 | [diff] [blame] | 1560 | { |
| 1561 | return 0; |
| 1562 | } |
Rich Felker | 5a09a53 | 2012-02-03 03:16:07 -0500 | [diff] [blame] | 1563 | #endif |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1564 | |
Rich Felker | 780cbbe | 2013-06-29 12:46:46 -0400 | [diff] [blame] | 1565 | int __dlinfo(void *dso, int req, void *res) |
| 1566 | { |
| 1567 | if (invalid_dso_handle(dso)) return -1; |
| 1568 | if (req != RTLD_DI_LINKMAP) { |
| 1569 | snprintf(errbuf, sizeof errbuf, "Unsupported request %d", req); |
| 1570 | errflag = 1; |
| 1571 | return -1; |
| 1572 | } |
| 1573 | *(struct link_map **)res = dso; |
| 1574 | return 0; |
| 1575 | } |
| 1576 | |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1577 | char *dlerror() |
| 1578 | { |
Rich Felker | a9e85c0 | 2012-03-23 00:28:20 -0400 | [diff] [blame] | 1579 | if (!errflag) return 0; |
| 1580 | errflag = 0; |
Rich Felker | a5d10eb | 2012-04-23 12:03:31 -0400 | [diff] [blame] | 1581 | return errbuf; |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1582 | } |
| 1583 | |
| 1584 | int dlclose(void *p) |
| 1585 | { |
Rich Felker | 6468fc9 | 2013-01-10 14:05:40 -0500 | [diff] [blame] | 1586 | return invalid_dso_handle(p); |
Rich Felker | 59ab43f | 2011-06-26 19:23:28 -0400 | [diff] [blame] | 1587 | } |