1226584Sdim/* 2226584Sdim * Copyright (c) 2010 The FreeBSD Foundation 3226584Sdim * All rights reserved. 4226584Sdim * 5226584Sdim * This software was developed by Rui Paulo under sponsorship from the 6226584Sdim * FreeBSD Foundation. 7226584Sdim * 8226584Sdim * Redistribution and use in source and binary forms, with or without 9226584Sdim * modification, are permitted provided that the following conditions 10226584Sdim * are met: 11226584Sdim * 1. Redistributions of source code must retain the above copyright 12226584Sdim * notice, this list of conditions and the following disclaimer. 13226584Sdim * 2. Redistributions in binary form must reproduce the above copyright 14226584Sdim * notice, this list of conditions and the following disclaimer in the 15226584Sdim * documentation and/or other materials provided with the distribution. 16226584Sdim * 17226584Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18226584Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19226584Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20226584Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21226584Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22226584Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23226584Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24226584Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25226584Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26226584Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27226584Sdim * SUCH DAMAGE. 28226584Sdim */ 29226584Sdim#include <sys/cdefs.h> 30226584Sdim__FBSDID("$FreeBSD: releng/10.3/lib/librtld_db/rtld_db.c 269720 2014-08-08 14:53:01Z markj $"); 31226584Sdim 32226584Sdim#include <machine/_inttypes.h> 33226584Sdim#include <sys/types.h> 34226584Sdim#include <sys/user.h> 35226584Sdim 36226584Sdim#include <err.h> 37226584Sdim#include <stdio.h> 38226584Sdim#include <stdlib.h> 39226584Sdim#include <string.h> 40226584Sdim#include <limits.h> 41226584Sdim#include <libproc.h> 42226584Sdim#include <libutil.h> 43226584Sdim 44226584Sdim#include "rtld_db.h" 45226584Sdim 46226584Sdimstatic int _librtld_db_debug = 0; 47226584Sdim#define DPRINTF(...) do { \ 48226584Sdim if (_librtld_db_debug) { \ 49226584Sdim fprintf(stderr, "librtld_db: DEBUG: "); \ 50226584Sdim fprintf(stderr, __VA_ARGS__); \ 51226584Sdim } \ 52226584Sdim} while (0) 53226584Sdim 54226584Sdimvoid 55226584Sdimrd_delete(rd_agent_t *rdap) 56226584Sdim{ 57226584Sdim 58226584Sdim free(rdap); 59226584Sdim} 60226584Sdim 61226584Sdimconst char * 62226584Sdimrd_errstr(rd_err_e rderr) 63226584Sdim{ 64226584Sdim 65226584Sdim switch (rderr) { 66226584Sdim case RD_ERR: 67226584Sdim return "generic error"; 68226584Sdim case RD_OK: 69226584Sdim return "no error"; 70226584Sdim case RD_NOCAPAB: 71226584Sdim return "capability not supported"; 72226584Sdim case RD_DBERR: 73226584Sdim return "database error"; 74226584Sdim case RD_NOBASE: 75226584Sdim return "NOBASE"; 76226584Sdim case RD_NOMAPS: 77226584Sdim return "NOMAPS"; 78226584Sdim default: 79226584Sdim return "unknown error"; 80226584Sdim } 81226584Sdim} 82226584Sdim 83226584Sdimrd_err_e 84226584Sdimrd_event_addr(rd_agent_t *rdap, rd_event_e event, rd_notify_t *notify) 85226584Sdim{ 86226584Sdim rd_err_e ret; 87226584Sdim 88226584Sdim DPRINTF("%s rdap %p event %d notify %p\n", __func__, rdap, event, 89226584Sdim notify); 90226584Sdim 91226584Sdim ret = RD_OK; 92226584Sdim switch (event) { 93226584Sdim case RD_NONE: 94226584Sdim break; 95226584Sdim case RD_PREINIT: 96226584Sdim notify->type = RD_NOTIFY_BPT; 97226584Sdim notify->u.bptaddr = rdap->rda_preinit_addr; 98226584Sdim break; 99226584Sdim case RD_POSTINIT: 100226584Sdim notify->type = RD_NOTIFY_BPT; 101226584Sdim notify->u.bptaddr = rdap->rda_postinit_addr; 102226584Sdim break; 103226584Sdim case RD_DLACTIVITY: 104226584Sdim notify->type = RD_NOTIFY_BPT; 105226584Sdim notify->u.bptaddr = rdap->rda_dlactivity_addr; 106226584Sdim break; 107226584Sdim default: 108226584Sdim ret = RD_ERR; 109226584Sdim break; 110226584Sdim } 111226584Sdim return (ret); 112226584Sdim} 113226584Sdim 114226584Sdimrd_err_e 115226584Sdimrd_event_enable(rd_agent_t *rdap __unused, int onoff) 116226584Sdim{ 117226584Sdim DPRINTF("%s onoff %d\n", __func__, onoff); 118226584Sdim 119226584Sdim return (RD_OK); 120226584Sdim} 121226584Sdim 122226584Sdimrd_err_e 123226584Sdimrd_event_getmsg(rd_agent_t *rdap __unused, rd_event_msg_t *msg) 124226584Sdim{ 125226584Sdim DPRINTF("%s\n", __func__); 126226584Sdim 127226584Sdim msg->type = RD_POSTINIT; 128226584Sdim msg->u.state = RD_CONSISTENT; 129226584Sdim 130226584Sdim return (RD_OK); 131226584Sdim} 132226584Sdim 133226584Sdimrd_err_e 134226584Sdimrd_init(int version) 135226584Sdim{ 136226584Sdim char *debug = NULL; 137226584Sdim 138226584Sdim if (version == RD_VERSION) { 139226584Sdim debug = getenv("LIBRTLD_DB_DEBUG"); 140226584Sdim _librtld_db_debug = debug ? atoi(debug) : 0; 141226584Sdim return (RD_OK); 142226584Sdim } else 143226584Sdim return (RD_NOCAPAB); 144226584Sdim} 145226584Sdim 146226584Sdimrd_err_e 147226584Sdimrd_loadobj_iter(rd_agent_t *rdap, rl_iter_f *cb, void *clnt_data) 148226584Sdim{ 149226584Sdim int cnt, i, lastvn = 0; 150226584Sdim rd_loadobj_t rdl; 151226584Sdim struct kinfo_vmentry *kves, *kve; 152226584Sdim 153226584Sdim DPRINTF("%s\n", __func__); 154226584Sdim 155226584Sdim if ((kves = kinfo_getvmmap(proc_getpid(rdap->rda_php), &cnt)) == NULL) { 156226584Sdim warn("ERROR: kinfo_getvmmap() failed"); 157226584Sdim return (RD_ERR); 158226584Sdim } 159226584Sdim for (i = 0; i < cnt; i++) { 160226584Sdim kve = kves + i; 161226584Sdim if (kve->kve_type == KVME_TYPE_VNODE) 162226584Sdim lastvn = i; 163226584Sdim memset(&rdl, 0, sizeof(rdl)); 164226584Sdim /* 165226584Sdim * Map the kinfo_vmentry struct to the rd_loadobj structure. 166226584Sdim */ 167226584Sdim rdl.rdl_saddr = kve->kve_start; 168226584Sdim rdl.rdl_eaddr = kve->kve_end; 169226584Sdim rdl.rdl_offset = kve->kve_offset; 170226584Sdim if (kve->kve_protection & KVME_PROT_READ) 171226584Sdim rdl.rdl_prot |= RD_RDL_R; 172226584Sdim if (kve->kve_protection & KVME_PROT_WRITE) 173226584Sdim rdl.rdl_prot |= RD_RDL_W; 174226584Sdim if (kve->kve_protection & KVME_PROT_EXEC) 175226584Sdim rdl.rdl_prot |= RD_RDL_X; 176226584Sdim strlcpy(rdl.rdl_path, kves[lastvn].kve_path, 177226584Sdim sizeof(rdl.rdl_path)); 178226584Sdim (*cb)(&rdl, clnt_data); 179226584Sdim } 180226584Sdim free(kves); 181226584Sdim 182226584Sdim return (RD_OK); 183226584Sdim} 184226584Sdim 185226584Sdimvoid 186226584Sdimrd_log(const int onoff) 187226584Sdim{ 188226584Sdim DPRINTF("%s\n", __func__); 189226584Sdim 190226584Sdim (void)onoff; 191226584Sdim} 192226584Sdim 193226584Sdimrd_agent_t * 194226584Sdimrd_new(struct proc_handle *php) 195226584Sdim{ 196226584Sdim rd_agent_t *rdap; 197226584Sdim 198226584Sdim rdap = malloc(sizeof(rd_agent_t)); 199226584Sdim if (rdap) { 200226584Sdim memset(rdap, 0, sizeof(rd_agent_t)); 201226584Sdim rdap->rda_php = php; 202226584Sdim rd_reset(rdap); 203226584Sdim } 204226584Sdim 205226584Sdim return (rdap); 206226584Sdim} 207226584Sdim 208226584Sdimrd_err_e 209226584Sdimrd_objpad_enable(rd_agent_t *rdap, size_t padsize) 210226584Sdim{ 211226584Sdim DPRINTF("%s\n", __func__); 212226584Sdim 213226584Sdim (void)rdap; 214226584Sdim (void)padsize; 215226584Sdim 216226584Sdim return (RD_ERR); 217226584Sdim} 218226584Sdim 219226584Sdimrd_err_e 220226584Sdimrd_plt_resolution(rd_agent_t *rdap, uintptr_t pc, struct proc *proc, 221226584Sdim uintptr_t plt_base, rd_plt_info_t *rpi) 222226584Sdim{ 223226584Sdim DPRINTF("%s\n", __func__); 224226584Sdim 225226584Sdim (void)rdap; 226226584Sdim (void)pc; 227226584Sdim (void)proc; 228226584Sdim (void)plt_base; 229226584Sdim (void)rpi; 230226584Sdim 231226584Sdim return (RD_ERR); 232226584Sdim} 233226584Sdim 234226584Sdimrd_err_e 235226584Sdimrd_reset(rd_agent_t *rdap) 236226584Sdim{ 237226584Sdim GElf_Sym sym; 238226584Sdim 239226584Sdim if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "r_debug_state", 240226584Sdim &sym) < 0) 241226584Sdim return (RD_ERR); 242226584Sdim DPRINTF("found r_debug_state at 0x%lx\n", (unsigned long)sym.st_value); 243226584Sdim rdap->rda_preinit_addr = sym.st_value; 244226584Sdim rdap->rda_dlactivity_addr = sym.st_value; 245226584Sdim 246226584Sdim if (proc_name2sym(rdap->rda_php, "ld-elf.so.1", "_r_debug_postinit", 247226584Sdim &sym) < 0) 248226584Sdim return (RD_ERR); 249226584Sdim DPRINTF("found _r_debug_postinit at 0x%lx\n", 250226584Sdim (unsigned long)sym.st_value); 251226584Sdim rdap->rda_postinit_addr = sym.st_value; 252226584Sdim 253226584Sdim return (RD_OK); 254226584Sdim} 255226584Sdim