2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2010 The FreeBSD Foundation
7 * This software was developed by Rui Paulo under sponsorship from the
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include <sys/param.h>
36 #include <sys/sysctl.h>
48 #include <machine/elf.h>
52 #include <libprocstat.h>
57 static int _librtld_db_debug = 0;
58 #define DPRINTF(...) do { \
59 if (_librtld_db_debug) { \
60 fprintf(stderr, "librtld_db: DEBUG: "); \
61 fprintf(stderr, __VA_ARGS__); \
66 rd_delete(rd_agent_t *rdap)
69 if (rdap->rda_procstat != NULL)
70 procstat_close(rdap->rda_procstat);
75 rd_errstr(rd_err_e rderr)
80 return "generic error";
84 return "capability not supported";
86 return "database error";
92 return "unknown error";
97 rd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify)
101 DPRINTF("%s rdap %p event %d notify %p\n", __func__, rdap, event,
109 notify->type = RD_NOTIFY_BPT;
110 notify->u.bptaddr = rdap->rda_preinit_addr;
113 notify->type = RD_NOTIFY_BPT;
114 notify->u.bptaddr = rdap->rda_postinit_addr;
117 notify->type = RD_NOTIFY_BPT;
118 notify->u.bptaddr = rdap->rda_dlactivity_addr;
128 rd_event_enable(rd_agent_t *rdap __unused, int onoff)
130 DPRINTF("%s onoff %d\n", __func__, onoff);
136 rd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg)
138 DPRINTF("%s\n", __func__);
140 msg->type = RD_POSTINIT;
141 msg->u.state = RD_CONSISTENT;
151 if (version == RD_VERSION) {
152 debug = getenv("LIBRTLD_DB_DEBUG");
153 _librtld_db_debug = debug ? atoi(debug) : 0;
160 rd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data)
162 struct kinfo_vmentry *kves, *kve;
170 DPRINTF("%s\n", __func__);
172 if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) {
173 warn("ERROR: kinfo_getvmmap() failed");
181 for (i = 0; i < cnt; i++) {
184 * Cache the base offset of the file mapping. The kve_offset
185 * field gives the file offset of a particular mapping into the
186 * file, but we want the mapping offset relative to the base
189 if (kve->kve_type == KVME_TYPE_VNODE &&
190 kve->kve_vn_fileid != fileid) {
191 base = kve->kve_start;
192 fileid = kve->kve_vn_fileid;
193 path = kve->kve_path;
195 memset(&rdl, 0, sizeof(rdl));
197 * Map the kinfo_vmentry struct to the rd_loadobj structure.
199 rdl.rdl_saddr = kve->kve_start;
200 rdl.rdl_eaddr = kve->kve_end;
201 rdl.rdl_offset = kve->kve_start - base;
202 if (kve->kve_protection & KVME_PROT_READ)
203 rdl.rdl_prot |= RD_RDL_R;
204 if (kve->kve_protection & KVME_PROT_WRITE)
205 rdl.rdl_prot |= RD_RDL_W;
206 if (kve->kve_protection & KVME_PROT_EXEC)
207 rdl.rdl_prot |= RD_RDL_X;
208 strlcpy(rdl.rdl_path, path, sizeof(rdl.rdl_path));
209 if ((*cb)(&rdl, clnt_data) != 0) {
219 rd_log(const int onoff)
221 DPRINTF("%s\n", __func__);
227 rd_new(struct proc_handle *php)
231 rdap = malloc(sizeof(*rdap));
235 memset(rdap, 0, sizeof(rd_agent_t));
237 rdap->rda_procstat = procstat_open_sysctl();
239 if (rd_reset(rdap) != RD_OK) {
247 rd_objpad_enable(rd_agent_t *rdap, size_t padsize)
249 DPRINTF("%s\n", __func__);
258 rd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc,
259 uintptr_t plt_base, rd_plt_info_t *rpi)
261 DPRINTF("%s\n", __func__);
273 rtld_syms(rd_agent_t *rdap, const char *rtldpath, u_long base)
281 Elf64_Word strscnidx;
287 fd = open(rtldpath, O_RDONLY);
291 if (elf_version(EV_CURRENT) == EV_NONE)
293 e = elf_begin(fd, ELF_C_READ, NULL);
298 while ((scn = elf_nextscn(e, scn)) != NULL) {
299 gelf_getshdr(scn, &shdr);
300 if (shdr.sh_type == SHT_DYNSYM)
306 strscnidx = shdr.sh_link;
307 data = elf_getdata(scn, NULL);
311 for (i = 0; gelf_getsym(data, i, &sym) != NULL; i++) {
312 if (GELF_ST_TYPE(sym.st_info) != STT_FUNC ||
313 GELF_ST_BIND(sym.st_info) != STB_GLOBAL)
315 symname = elf_strptr(e, strscnidx, sym.st_name);
319 if (strcmp(symname, "r_debug_state") == 0) {
320 rdap->rda_preinit_addr = sym.st_value + base;
321 rdap->rda_dlactivity_addr = sym.st_value + base;
322 } else if (strcmp(symname, "_r_debug_postinit") == 0) {
323 rdap->rda_postinit_addr = sym.st_value + base;
327 if (rdap->rda_preinit_addr != 0 &&
328 rdap->rda_postinit_addr != 0 &&
329 rdap->rda_dlactivity_addr != 0)
341 rd_reset(rd_agent_t *rdap)
343 struct kinfo_proc *kp;
344 struct kinfo_vmentry *kve;
346 const char *rtldpath;
356 kp = procstat_getprocs(rdap->rda_procstat, KERN_PROC_PID,
357 proc_getpid(rdap->rda_php), &count);
362 auxv = procstat_getauxv(rdap->rda_procstat, kp, &count);
367 for (i = 0; i < count; i++) {
368 if (auxv[i].a_type == AT_BASE) {
369 base = auxv[i].a_un.a_val;
377 kve = procstat_getvmmap(rdap->rda_procstat, kp, &count);
380 for (i = 0; i < count; i++) {
381 if (kve[i].kve_start == base) {
382 rtldpath = kve[i].kve_path;
389 if (rtld_syms(rdap, rtldpath, base) != 0)
396 procstat_freevmmap(rdap->rda_procstat, kve);
398 procstat_freeauxv(rdap->rda_procstat, auxv);
400 procstat_freeprocs(rdap->rda_procstat, kp);