1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include <rtld_db.h>
38
39 #include "_libproc.h"
40
41 static void rdl2prmap(const rd_loadobj_t *, prmap_t *);
42
43 static int
map_iter(const rd_loadobj_t * lop,void * arg)44 map_iter(const rd_loadobj_t *lop, void *arg)
45 {
46 struct file_info *file;
47 struct map_info *mapping, *tmp;
48 struct proc_handle *phdl;
49 size_t i;
50
51 phdl = arg;
52 if (phdl->nmappings >= phdl->maparrsz) {
53 phdl->maparrsz *= 2;
54 tmp = reallocarray(phdl->mappings, phdl->maparrsz,
55 sizeof(*phdl->mappings));
56 if (tmp == NULL)
57 return (-1);
58 phdl->mappings = tmp;
59 }
60
61 mapping = &phdl->mappings[phdl->nmappings];
62 rdl2prmap(lop, &mapping->map);
63 if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
64 (lop->rdl_prot & RD_RDL_X) != 0)
65 phdl->exec_map = phdl->nmappings;
66
67 file = NULL;
68 if (lop->rdl_path[0] != '\0') {
69 /* Look for an existing mapping of the same file. */
70 for (i = 0; i < phdl->nmappings; i++)
71 if (strcmp(mapping->map.pr_mapname,
72 phdl->mappings[i].map.pr_mapname) == 0) {
73 file = phdl->mappings[i].file;
74 break;
75 }
76
77 if (file == NULL) {
78 file = malloc(sizeof(*file));
79 if (file == NULL)
80 return (-1);
81 file->elf = NULL;
82 file->fd = -1;
83 file->refs = 1;
84 } else
85 file->refs++;
86 }
87 mapping->file = file;
88 phdl->nmappings++;
89 return (0);
90 }
91
92 static void
rdl2prmap(const rd_loadobj_t * rdl,prmap_t * map)93 rdl2prmap(const rd_loadobj_t *rdl, prmap_t *map)
94 {
95
96 map->pr_vaddr = rdl->rdl_saddr;
97 map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
98 map->pr_offset = rdl->rdl_offset;
99 map->pr_mflags = 0;
100 if (rdl->rdl_prot & RD_RDL_R)
101 map->pr_mflags |= MA_READ;
102 if (rdl->rdl_prot & RD_RDL_W)
103 map->pr_mflags |= MA_WRITE;
104 if (rdl->rdl_prot & RD_RDL_X)
105 map->pr_mflags |= MA_EXEC;
106 (void)strlcpy(map->pr_mapname, rdl->rdl_path,
107 sizeof(map->pr_mapname));
108 }
109
110 rd_agent_t *
proc_rdagent(struct proc_handle * phdl)111 proc_rdagent(struct proc_handle *phdl)
112 {
113
114 if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
115 phdl->status != PS_IDLE) {
116 if ((phdl->rdap = rd_new(phdl)) == NULL)
117 return (NULL);
118
119 phdl->maparrsz = 64;
120 phdl->mappings = calloc(phdl->maparrsz,
121 sizeof(*phdl->mappings));
122 if (phdl->mappings == NULL)
123 return (phdl->rdap);
124 if (rd_loadobj_iter(phdl->rdap, map_iter, phdl) != RD_OK)
125 return (NULL);
126 }
127 return (phdl->rdap);
128 }
129
130 void
proc_updatesyms(struct proc_handle * phdl)131 proc_updatesyms(struct proc_handle *phdl)
132 {
133
134 memset(phdl->mappings, 0, sizeof(*phdl->mappings) * phdl->maparrsz);
135 rd_loadobj_iter(phdl->rdap, map_iter, phdl);
136 }
137