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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #include <stdlib.h> 27 #include <libelf.h> 28 #include <libgen.h> 29 #include <string.h> 30 #include <strings.h> 31 #include <errno.h> 32 #include <sys/sysmacros.h> 33 34 #include "libproc.h" 35 #include "Pcontrol.h" 36 37 static ssize_t 38 Pread_idle(struct ps_prochandle *P, void *buf, size_t n, uintptr_t addr) 39 { 40 size_t resid = n; 41 42 while (resid > 0) { 43 map_info_t *mp; 44 uintptr_t mapoff; 45 ssize_t len; 46 off64_t off; 47 48 if ((mp = Paddr2mptr(P, addr)) == NULL) 49 break; 50 51 mapoff = addr - mp->map_pmap.pr_vaddr; 52 len = MIN(resid, mp->map_pmap.pr_size - mapoff); 53 off = mp->map_offset + mapoff; 54 55 if ((len = pread64(P->asfd, buf, len, off)) <= 0) 56 break; 57 58 resid -= len; 59 addr += len; 60 buf = (char *)buf + len; 61 } 62 63 return (n - resid); 64 } 65 66 /*ARGSUSED*/ 67 static ssize_t 68 Pwrite_idle(struct ps_prochandle *P, const void *buf, size_t n, uintptr_t addr) 69 { 70 errno = EIO; 71 return (-1); 72 } 73 74 static const ps_rwops_t P_idle_ops = { 75 Pread_idle, 76 Pwrite_idle 77 }; 78 79 static int 80 idle_add_mapping(struct ps_prochandle *P, GElf_Phdr *php, file_info_t *fp) 81 { 82 prmap_t pmap; 83 84 dprintf("mapping base %llx filesz %llu memsz %llu offset %llu\n", 85 (u_longlong_t)php->p_vaddr, (u_longlong_t)php->p_filesz, 86 (u_longlong_t)php->p_memsz, (u_longlong_t)php->p_offset); 87 88 pmap.pr_vaddr = (uintptr_t)php->p_vaddr; 89 pmap.pr_size = php->p_filesz; 90 (void) strncpy(pmap.pr_mapname, fp->file_pname, 91 sizeof (pmap.pr_mapname)); 92 pmap.pr_offset = php->p_offset; 93 94 pmap.pr_mflags = 0; 95 if (php->p_flags & PF_R) 96 pmap.pr_mflags |= MA_READ; 97 if (php->p_flags & PF_W) 98 pmap.pr_mflags |= MA_WRITE; 99 if (php->p_flags & PF_X) 100 pmap.pr_mflags |= MA_EXEC; 101 102 pmap.pr_pagesize = 0; 103 pmap.pr_shmid = -1; 104 105 return (Padd_mapping(P, php->p_offset, fp, &pmap)); 106 } 107 108 struct ps_prochandle * 109 Pgrab_file(const char *fname, int *perr) 110 { 111 struct ps_prochandle *P = NULL; 112 char buf[PATH_MAX]; 113 GElf_Ehdr ehdr; 114 Elf *elf = NULL; 115 size_t phnum; 116 file_info_t *fp = NULL; 117 int fd; 118 int i; 119 120 if ((fd = open64(fname, O_RDONLY)) < 0) { 121 dprintf("couldn't open file"); 122 *perr = (errno == ENOENT) ? G_NOEXEC : G_STRANGE; 123 return (NULL); 124 } 125 126 if (elf_version(EV_CURRENT) == EV_NONE) { 127 dprintf("libproc ELF version is more recent than libelf"); 128 *perr = G_ELF; 129 goto err; 130 } 131 132 if ((P = calloc(1, sizeof (struct ps_prochandle))) == NULL) { 133 *perr = G_STRANGE; 134 goto err; 135 } 136 137 (void) mutex_init(&P->proc_lock, USYNC_THREAD, NULL); 138 P->state = PS_IDLE; 139 P->pid = (pid_t)-1; 140 P->asfd = fd; 141 P->ctlfd = -1; 142 P->statfd = -1; 143 P->agentctlfd = -1; 144 P->agentstatfd = -1; 145 P->info_valid = -1; 146 P->ops = &P_idle_ops; 147 Pinitsym(P); 148 149 if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { 150 *perr = G_ELF; 151 return (NULL); 152 } 153 154 /* 155 * Construct a file_info_t that corresponds to this file. 156 */ 157 if ((fp = calloc(1, sizeof (file_info_t))) == NULL) { 158 *perr = G_STRANGE; 159 goto err; 160 } 161 162 if ((fp->file_lo = calloc(1, sizeof (rd_loadobj_t))) == NULL) { 163 *perr = G_STRANGE; 164 goto err; 165 } 166 167 if (*fname == '/') { 168 (void) strncpy(fp->file_pname, fname, sizeof (fp->file_pname)); 169 } else { 170 size_t sz; 171 172 if (getcwd(fp->file_pname, sizeof (fp->file_pname) - 1) == 173 NULL) { 174 *perr = G_STRANGE; 175 goto err; 176 } 177 178 sz = strlen(fp->file_pname); 179 (void) snprintf(&fp->file_pname[sz], 180 sizeof (fp->file_pname) - sz, "/%s", fname); 181 } 182 183 fp->file_fd = fd; 184 fp->file_lo->rl_lmident = LM_ID_BASE; 185 if ((fp->file_lname = strdup(fp->file_pname)) == NULL) { 186 *perr = G_STRANGE; 187 goto err; 188 } 189 fp->file_lbase = basename(fp->file_lname); 190 191 if ((P->execname = strdup(fp->file_pname)) == NULL) { 192 *perr = G_STRANGE; 193 goto err; 194 } 195 196 P->num_files++; 197 list_link(fp, &P->file_head); 198 199 if (gelf_getehdr(elf, &ehdr) == NULL) { 200 *perr = G_STRANGE; 201 goto err; 202 } 203 204 if (elf_getphnum(elf, &phnum) == 0) { 205 *perr = G_STRANGE; 206 goto err; 207 } 208 209 dprintf("Pgrab_file: program header count = %lu\n", (ulong_t)phnum); 210 211 /* 212 * Sift through the program headers making the relevant maps. 213 */ 214 for (i = 0; i < phnum; i++) { 215 GElf_Phdr phdr, *php; 216 217 if ((php = gelf_getphdr(elf, i, &phdr)) == NULL) { 218 *perr = G_STRANGE; 219 goto err; 220 } 221 222 if (php->p_type != PT_LOAD) 223 continue; 224 225 if (idle_add_mapping(P, php, fp) != 0) { 226 *perr = G_STRANGE; 227 goto err; 228 } 229 } 230 Psort_mappings(P); 231 232 (void) elf_end(elf); 233 234 P->map_exec = fp->file_map; 235 236 P->status.pr_flags = PR_STOPPED; 237 P->status.pr_nlwp = 0; 238 P->status.pr_pid = (pid_t)-1; 239 P->status.pr_ppid = (pid_t)-1; 240 P->status.pr_pgid = (pid_t)-1; 241 P->status.pr_sid = (pid_t)-1; 242 P->status.pr_taskid = (taskid_t)-1; 243 P->status.pr_projid = (projid_t)-1; 244 P->status.pr_zoneid = (zoneid_t)-1; 245 switch (ehdr.e_ident[EI_CLASS]) { 246 case ELFCLASS32: 247 P->status.pr_dmodel = PR_MODEL_ILP32; 248 break; 249 case ELFCLASS64: 250 P->status.pr_dmodel = PR_MODEL_LP64; 251 break; 252 default: 253 *perr = G_FORMAT; 254 goto err; 255 } 256 257 /* 258 * Pfindobj() checks what zone a process is associated with, so 259 * we call it after initializing pr_zoneid to -1. This ensures 260 * we don't get associated with any zone on the system. 261 */ 262 if (Pfindobj(P, fp->file_lname, buf, sizeof (buf)) != NULL) { 263 free(P->execname); 264 P->execname = strdup(buf); 265 if ((fp->file_rname = strdup(buf)) != NULL) 266 fp->file_rbase = basename(fp->file_rname); 267 } 268 269 /* 270 * The file and map lists are complete, and will never need to be 271 * adjusted. 272 */ 273 P->info_valid = 1; 274 275 return (P); 276 err: 277 (void) close(fd); 278 if (P != NULL) 279 Pfree(P); 280 if (elf != NULL) 281 (void) elf_end(elf); 282 return (NULL); 283 } 284