1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 /* 26 * Copyright (c) 2013 by Delphix. All rights reserved. 27 */ 28 29 #include <stdlib.h> 30 #include <libelf.h> 31 #include <libgen.h> 32 #include <string.h> 33 #include <strings.h> 34 #include <errno.h> 35 #include <sys/sysmacros.h> 36 37 #include "libproc.h" 38 #include "Pcontrol.h" 39 40 /*ARGSUSED*/ 41 static ssize_t 42 Pread_idle(struct ps_prochandle *P, void *buf, size_t n, uintptr_t addr, 43 void *data) 44 { 45 size_t resid = n; 46 47 while (resid > 0) { 48 map_info_t *mp; 49 uintptr_t mapoff; 50 ssize_t len; 51 off64_t off; 52 53 if ((mp = Paddr2mptr(P, addr)) == NULL) 54 break; 55 56 mapoff = addr - mp->map_pmap.pr_vaddr; 57 len = MIN(resid, mp->map_pmap.pr_size - mapoff); 58 off = mp->map_offset + mapoff; 59 60 if ((len = pread64(P->asfd, buf, len, off)) <= 0) 61 break; 62 63 resid -= len; 64 addr += len; 65 buf = (char *)buf + len; 66 } 67 68 return (n - resid); 69 } 70 71 /*ARGSUSED*/ 72 static ssize_t 73 Pwrite_idle(struct ps_prochandle *P, const void *buf, size_t n, uintptr_t addr, 74 void *data) 75 { 76 errno = EIO; 77 return (-1); 78 } 79 80 /*ARGSUSED*/ 81 static int 82 Ppriv_idle(struct ps_prochandle *P, prpriv_t **pprv, void *data) 83 { 84 prpriv_t *pp; 85 86 pp = proc_get_priv(P->pid); 87 if (pp == NULL) { 88 return (-1); 89 } 90 91 *pprv = pp; 92 return (0); 93 } 94 95 /* Default operations for the idl ops vector. */ 96 static void * 97 Pidle_voidp() 98 { 99 errno = ENODATA; 100 return (NULL); 101 } 102 103 static int 104 Pidle_int() 105 { 106 errno = ENODATA; 107 return (-1); 108 } 109 110 static const ps_ops_t P_idle_ops = { 111 .pop_pread = Pread_idle, 112 .pop_pwrite = Pwrite_idle, 113 .pop_cred = (pop_cred_t)Pidle_int, 114 .pop_priv = Ppriv_idle, 115 .pop_secflags = (pop_secflags_t)Pidle_int, 116 .pop_psinfo = (pop_psinfo_t)Pidle_voidp, 117 .pop_platform = (pop_platform_t)Pidle_voidp, 118 .pop_uname = (pop_uname_t)Pidle_int, 119 .pop_zonename = (pop_zonename_t)Pidle_voidp, 120 #if defined(__i386) || defined(__amd64) 121 .pop_ldt = (pop_ldt_t)Pidle_int 122 #endif 123 }; 124 125 static int 126 idle_add_mapping(struct ps_prochandle *P, GElf_Phdr *php, file_info_t *fp) 127 { 128 prmap_t pmap; 129 130 dprintf("mapping base %llx filesz %llu memsz %llu offset %llu\n", 131 (u_longlong_t)php->p_vaddr, (u_longlong_t)php->p_filesz, 132 (u_longlong_t)php->p_memsz, (u_longlong_t)php->p_offset); 133 134 pmap.pr_vaddr = (uintptr_t)php->p_vaddr; 135 pmap.pr_size = php->p_filesz; 136 (void) strncpy(pmap.pr_mapname, fp->file_pname, 137 sizeof (pmap.pr_mapname)); 138 pmap.pr_offset = php->p_offset; 139 140 pmap.pr_mflags = 0; 141 if (php->p_flags & PF_R) 142 pmap.pr_mflags |= MA_READ; 143 if (php->p_flags & PF_W) 144 pmap.pr_mflags |= MA_WRITE; 145 if (php->p_flags & PF_X) 146 pmap.pr_mflags |= MA_EXEC; 147 148 pmap.pr_pagesize = 0; 149 pmap.pr_shmid = -1; 150 151 return (Padd_mapping(P, php->p_offset, fp, &pmap)); 152 } 153 154 struct ps_prochandle * 155 Pgrab_file(const char *fname, int *perr) 156 { 157 struct ps_prochandle *P = NULL; 158 char buf[PATH_MAX]; 159 GElf_Ehdr ehdr; 160 Elf *elf = NULL; 161 size_t phnum; 162 file_info_t *fp = NULL; 163 int fd; 164 int i; 165 166 if ((fd = open64(fname, O_RDONLY)) < 0) { 167 dprintf("couldn't open file"); 168 *perr = (errno == ENOENT) ? G_NOEXEC : G_STRANGE; 169 return (NULL); 170 } 171 172 if (elf_version(EV_CURRENT) == EV_NONE) { 173 dprintf("libproc ELF version is more recent than libelf"); 174 *perr = G_ELF; 175 goto err; 176 } 177 178 if ((P = calloc(1, sizeof (struct ps_prochandle))) == NULL) { 179 *perr = G_STRANGE; 180 goto err; 181 } 182 183 (void) mutex_init(&P->proc_lock, USYNC_THREAD, NULL); 184 P->state = PS_IDLE; 185 P->pid = (pid_t)-1; 186 P->asfd = fd; 187 P->ctlfd = -1; 188 P->statfd = -1; 189 P->agentctlfd = -1; 190 P->agentstatfd = -1; 191 P->info_valid = -1; 192 Pinit_ops(&P->ops, &P_idle_ops); 193 Pinitsym(P); 194 195 if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { 196 *perr = G_ELF; 197 return (NULL); 198 } 199 200 /* 201 * Construct a file_info_t that corresponds to this file. 202 */ 203 if ((fp = calloc(1, sizeof (file_info_t))) == NULL) { 204 *perr = G_STRANGE; 205 goto err; 206 } 207 208 if ((fp->file_lo = calloc(1, sizeof (rd_loadobj_t))) == NULL) { 209 *perr = G_STRANGE; 210 goto err; 211 } 212 213 if (*fname == '/') { 214 (void) strncpy(fp->file_pname, fname, sizeof (fp->file_pname)); 215 } else { 216 size_t sz; 217 218 if (getcwd(fp->file_pname, sizeof (fp->file_pname) - 1) == 219 NULL) { 220 *perr = G_STRANGE; 221 goto err; 222 } 223 224 sz = strlen(fp->file_pname); 225 (void) snprintf(&fp->file_pname[sz], 226 sizeof (fp->file_pname) - sz, "/%s", fname); 227 } 228 229 fp->file_fd = fd; 230 fp->file_dbgfile = -1; 231 fp->file_lo->rl_lmident = LM_ID_BASE; 232 if ((fp->file_lname = strdup(fp->file_pname)) == NULL) { 233 *perr = G_STRANGE; 234 goto err; 235 } 236 fp->file_lbase = basename(fp->file_lname); 237 238 if ((P->execname = strdup(fp->file_pname)) == NULL) { 239 *perr = G_STRANGE; 240 goto err; 241 } 242 243 P->num_files++; 244 list_link(fp, &P->file_head); 245 246 if (gelf_getehdr(elf, &ehdr) == NULL) { 247 *perr = G_STRANGE; 248 goto err; 249 } 250 251 if (elf_getphdrnum(elf, &phnum) == -1) { 252 *perr = G_STRANGE; 253 goto err; 254 } 255 256 dprintf("Pgrab_file: program header count = %lu\n", (ulong_t)phnum); 257 258 /* 259 * Sift through the program headers making the relevant maps. 260 */ 261 for (i = 0; i < phnum; i++) { 262 GElf_Phdr phdr, *php; 263 264 if ((php = gelf_getphdr(elf, i, &phdr)) == NULL) { 265 *perr = G_STRANGE; 266 goto err; 267 } 268 269 if (php->p_type != PT_LOAD) 270 continue; 271 272 if (idle_add_mapping(P, php, fp) != 0) { 273 *perr = G_STRANGE; 274 goto err; 275 } 276 } 277 Psort_mappings(P); 278 279 (void) elf_end(elf); 280 281 P->map_exec = fp->file_map; 282 283 P->status.pr_flags = PR_STOPPED; 284 P->status.pr_nlwp = 0; 285 P->status.pr_pid = (pid_t)-1; 286 P->status.pr_ppid = (pid_t)-1; 287 P->status.pr_pgid = (pid_t)-1; 288 P->status.pr_sid = (pid_t)-1; 289 P->status.pr_taskid = (taskid_t)-1; 290 P->status.pr_projid = (projid_t)-1; 291 P->status.pr_zoneid = (zoneid_t)-1; 292 switch (ehdr.e_ident[EI_CLASS]) { 293 case ELFCLASS32: 294 P->status.pr_dmodel = PR_MODEL_ILP32; 295 break; 296 case ELFCLASS64: 297 P->status.pr_dmodel = PR_MODEL_LP64; 298 break; 299 default: 300 *perr = G_FORMAT; 301 goto err; 302 } 303 304 /* 305 * Pfindobj() checks what zone a process is associated with, so 306 * we call it after initializing pr_zoneid to -1. This ensures 307 * we don't get associated with any zone on the system. 308 */ 309 if (Pfindobj(P, fp->file_lname, buf, sizeof (buf)) != NULL) { 310 free(P->execname); 311 P->execname = strdup(buf); 312 if ((fp->file_rname = strdup(buf)) != NULL) 313 fp->file_rbase = basename(fp->file_rname); 314 } 315 316 /* 317 * The file and map lists are complete, and will never need to be 318 * adjusted. 319 */ 320 P->info_valid = 1; 321 322 return (P); 323 err: 324 (void) close(fd); 325 if (P != NULL) 326 Pfree(P); 327 if (elf != NULL) 328 (void) elf_end(elf); 329 return (NULL); 330 } 331