lib/libproc/proc_rtld.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2010 The FreeBSD Foundation
   5  * All rights reserved.
   6  *
   7  * This software was developed by Rui Paulo under sponsorship from the
   8  * FreeBSD Foundation.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __FBSDID("$FreeBSD$");
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #include <rtld_db.h>
  40
  41 #include "_libproc.h"
  42
  43 static void     rdl2prmap(const rd_loadobj_t *, prmap_t *);
  44
  45 static int
  46 map_iter(const rd_loadobj_t *lop, void *arg)
  47 {
  48         struct file_info *file;
  49         struct map_info *mapping, *tmp;
  50         struct proc_handle *phdl;
  51         size_t i;
  52
  53         phdl = arg;
  54         if (phdl->nmappings >= phdl->maparrsz) {
  55                 phdl->maparrsz *= 2;
  56                 tmp = reallocarray(phdl->mappings, phdl->maparrsz,
  57                     sizeof(*phdl->mappings));
  58                 if (tmp == NULL)
  59                         return (-1);
  60                 phdl->mappings = tmp;
  61         }
  62
  63         mapping = &phdl->mappings[phdl->nmappings];
  64         rdl2prmap(lop, &mapping->map);
  65         if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
  66             (lop->rdl_prot & RD_RDL_X) != 0)
  67                 phdl->exec_map = phdl->nmappings;
  68
  69         file = NULL;
  70         if (lop->rdl_path[0] != '\0') {
  71                 /* Look for an existing mapping of the same file. */
  72                 for (i = 0; i < phdl->nmappings; i++)
  73                         if (strcmp(mapping->map.pr_mapname,
  74                             phdl->mappings[i].map.pr_mapname) == 0) {
  75                                 file = phdl->mappings[i].file;
  76                                 break;
  77                         }
  78
  79                 if (file == NULL) {
  80                         file = malloc(sizeof(*file));
  81                         if (file == NULL)
  82                                 return (-1);
  83                         file->elf = NULL;
  84                         file->fd = -1;
  85                         file->refs = 1;
  86                 } else
  87                         file->refs++;
  88         }
  89         mapping->file = file;
  90         phdl->nmappings++;
  91         return (0);
  92 }
  93
  94 static void
  95 rdl2prmap(const rd_loadobj_t *rdl, prmap_t *map)
  96 {
  97
  98         map->pr_vaddr = rdl->rdl_saddr;
  99         map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
 100         map->pr_offset = rdl->rdl_offset;
 101         map->pr_mflags = 0;
 102         if (rdl->rdl_prot & RD_RDL_R)
 103                 map->pr_mflags |= MA_READ;
 104         if (rdl->rdl_prot & RD_RDL_W)
 105                 map->pr_mflags |= MA_WRITE;
 106         if (rdl->rdl_prot & RD_RDL_X)
 107                 map->pr_mflags |= MA_EXEC;
 108         (void)strlcpy(map->pr_mapname, rdl->rdl_path,
 109             sizeof(map->pr_mapname));
 110 }
 111
 112 rd_agent_t *
 113 proc_rdagent(struct proc_handle *phdl)
 114 {
 115
 116         if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
 117             phdl->status != PS_IDLE) {
 118                 if ((phdl->rdap = rd_new(phdl)) == NULL)
 119                         return (NULL);
 120
 121                 phdl->maparrsz = 64;
 122                 phdl->mappings = calloc(phdl->maparrsz,
 123                     sizeof(*phdl->mappings));
 124                 if (phdl->mappings == NULL)
 125                         return (phdl->rdap);
 126                 if (rd_loadobj_iter(phdl->rdap, map_iter, phdl) != RD_OK)
 127                         return (NULL);
 128         }
 129         return (phdl->rdap);
 130 }
 131
 132 void
 133 proc_updatesyms(struct proc_handle *phdl)
 134 {
 135
 136         memset(phdl->mappings, 0, sizeof(*phdl->mappings) * phdl->maparrsz);
 137         rd_loadobj_iter(phdl->rdap, map_iter, phdl);
 138 }