freebsd-dev/lib/libproc/proc_rtld.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Rui Paulo under sponsorship from the
* FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rtld_db.h>
#include "_libproc.h"
static void rdl2prmap(const rd_loadobj_t *, prmap_t *);
static int
map_iter(const rd_loadobj_t *lop, void *arg)
{
struct file_info *file;
struct map_info *mapping, *tmp;
struct proc_handle *phdl;
size_t i;
phdl = arg;
if (phdl->nmappings >= phdl->maparrsz) {
phdl->maparrsz *= 2;
tmp = reallocarray(phdl->mappings, phdl->maparrsz,
sizeof(*phdl->mappings));
if (tmp == NULL)
return (-1);
phdl->mappings = tmp;
}
mapping = &phdl->mappings[phdl->nmappings];
rdl2prmap(lop, &mapping->map);
if (strcmp(lop->rdl_path, phdl->execpath) == 0 &&
(lop->rdl_prot & RD_RDL_X) != 0)
phdl->exec_map = phdl->nmappings;
file = NULL;
if (lop->rdl_path[0] != '\0') {
/* Look for an existing mapping of the same file. */
for (i = 0; i < phdl->nmappings; i++)
if (strcmp(mapping->map.pr_mapname,
phdl->mappings[i].map.pr_mapname) == 0) {
file = phdl->mappings[i].file;
break;
}
if (file == NULL) {
file = malloc(sizeof(*file));
if (file == NULL)
return (-1);
file->elf = NULL;
file->fd = -1;
file->refs = 1;
} else
file->refs++;
}
mapping->file = file;
phdl->nmappings++;
return (0);
}
static void
rdl2prmap(const rd_loadobj_t *rdl, prmap_t *map)
{
map->pr_vaddr = rdl->rdl_saddr;
map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
map->pr_offset = rdl->rdl_offset;
map->pr_mflags = 0;
if (rdl->rdl_prot & RD_RDL_R)
map->pr_mflags |= MA_READ;
if (rdl->rdl_prot & RD_RDL_W)
map->pr_mflags |= MA_WRITE;
if (rdl->rdl_prot & RD_RDL_X)
map->pr_mflags |= MA_EXEC;
(void)strlcpy(map->pr_mapname, rdl->rdl_path,
sizeof(map->pr_mapname));
}
rd_agent_t *
proc_rdagent(struct proc_handle *phdl)
{
if (phdl->rdap == NULL && phdl->status != PS_UNDEAD &&
phdl->status != PS_IDLE) {
if ((phdl->rdap = rd_new(phdl)) == NULL)
return (NULL);
phdl->maparrsz = 64;
phdl->mappings = calloc(phdl->maparrsz,
sizeof(*phdl->mappings));
if (phdl->mappings == NULL)
return (phdl->rdap);
if (rd_loadobj_iter(phdl->rdap, map_iter, phdl) != RD_OK)
return (NULL);
}
return (phdl->rdap);
}
void
proc_updatesyms(struct proc_handle *phdl)
{
memset(phdl->mappings, 0, sizeof(*phdl->mappings) * phdl->maparrsz);
rd_loadobj_iter(phdl->rdap, map_iter, phdl);
}