96ec3cdd8e
erroneously skip symbols that were not mangled at all. Fix this by moving the return into the preceding if block. While here, simplify the code by letting __cxa_demangle() allocate the needed space for the demangled symbol. This also fixes a memory leak, which would occur whenever __cxa_demangle() failed. Reported by: pgj MFC after: 3 days
601 lines
14 KiB
C
601 lines
14 KiB
C
/*-
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* Copyright (c) 2010 The FreeBSD Foundation
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* Copyright (c) 2008 John Birrell (jb@freebsd.org)
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* All rights reserved.
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*
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* Portions of this software were developed by Rui Paulo under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/user.h>
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#include <assert.h>
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#include <err.h>
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#include <stdio.h>
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#include <libgen.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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#include <libutil.h>
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#include "_libproc.h"
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#ifndef NO_CXA_DEMANGLE
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extern char *__cxa_demangle(const char *, char *, size_t *, int *);
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#endif /* NO_CXA_DEMANGLE */
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static void proc_rdl2prmap(rd_loadobj_t *, prmap_t *);
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static void
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demangle(const char *symbol, char *buf, size_t len)
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{
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#ifndef NO_CXA_DEMANGLE
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char *dembuf;
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if (symbol[0] == '_' && symbol[1] == 'Z' && symbol[2]) {
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dembuf = __cxa_demangle(symbol, NULL, NULL, NULL);
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if (!dembuf)
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goto fail;
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strlcpy(buf, dembuf, len);
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free(dembuf);
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return;
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}
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fail:
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#endif /* NO_CXA_DEMANGLE */
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strlcpy(buf, symbol, len);
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}
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static void
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proc_rdl2prmap(rd_loadobj_t *rdl, prmap_t *map)
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{
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map->pr_vaddr = rdl->rdl_saddr;
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map->pr_size = rdl->rdl_eaddr - rdl->rdl_saddr;
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map->pr_offset = rdl->rdl_offset;
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map->pr_mflags = 0;
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if (rdl->rdl_prot & RD_RDL_R)
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map->pr_mflags |= MA_READ;
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if (rdl->rdl_prot & RD_RDL_W)
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map->pr_mflags |= MA_WRITE;
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if (rdl->rdl_prot & RD_RDL_X)
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map->pr_mflags |= MA_EXEC;
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strlcpy(map->pr_mapname, rdl->rdl_path,
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sizeof(map->pr_mapname));
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}
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char *
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proc_objname(struct proc_handle *p, uintptr_t addr, char *objname,
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size_t objnamesz)
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{
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size_t i;
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rd_loadobj_t *rdl;
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for (i = 0; i < p->nobjs; i++) {
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rdl = &p->rdobjs[i];
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if (addr >= rdl->rdl_saddr && addr < rdl->rdl_eaddr) {
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strlcpy(objname, rdl->rdl_path, objnamesz);
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return (objname);
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}
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}
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return (NULL);
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}
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prmap_t *
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proc_obj2map(struct proc_handle *p, const char *objname)
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{
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size_t i;
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prmap_t *map;
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rd_loadobj_t *rdl;
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char path[MAXPATHLEN];
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rdl = NULL;
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for (i = 0; i < p->nobjs; i++) {
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basename_r(p->rdobjs[i].rdl_path, path);
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if (strcmp(path, objname) == 0) {
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rdl = &p->rdobjs[i];
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break;
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}
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}
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if (rdl == NULL && strcmp(objname, "a.out") == 0 && p->rdexec != NULL)
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rdl = p->rdexec;
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else
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return (NULL);
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if ((map = malloc(sizeof(*map))) == NULL)
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return (NULL);
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proc_rdl2prmap(rdl, map);
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return (map);
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}
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int
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proc_iter_objs(struct proc_handle *p, proc_map_f *func, void *cd)
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{
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size_t i;
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rd_loadobj_t *rdl;
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prmap_t map;
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char path[MAXPATHLEN];
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char last[MAXPATHLEN];
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if (p->nobjs == 0)
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return (-1);
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memset(last, 0, sizeof(last));
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for (i = 0; i < p->nobjs; i++) {
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rdl = &p->rdobjs[i];
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proc_rdl2prmap(rdl, &map);
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basename_r(rdl->rdl_path, path);
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/*
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* We shouldn't call the callback twice with the same object.
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* To do that we are assuming the fact that if there are
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* repeated object names (i.e. different mappings for the
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* same object) they occur next to each other.
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*/
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if (strcmp(path, last) == 0)
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continue;
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(*func)(cd, &map, path);
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strlcpy(last, path, sizeof(last));
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}
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return (0);
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}
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prmap_t *
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proc_addr2map(struct proc_handle *p, uintptr_t addr)
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{
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size_t i;
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int cnt, lastvn = 0;
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prmap_t *map;
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rd_loadobj_t *rdl;
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struct kinfo_vmentry *kves, *kve;
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/*
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* If we don't have a cache of listed objects, we need to query
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* it ourselves.
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*/
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if (p->nobjs == 0) {
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if ((kves = kinfo_getvmmap(p->pid, &cnt)) == NULL)
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return (NULL);
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for (i = 0; i < (size_t)cnt; i++) {
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kve = kves + i;
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if (kve->kve_type == KVME_TYPE_VNODE)
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lastvn = i;
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if (addr >= kve->kve_start && addr < kve->kve_end) {
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if ((map = malloc(sizeof(*map))) == NULL) {
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free(kves);
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return (NULL);
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}
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map->pr_vaddr = kve->kve_start;
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map->pr_size = kve->kve_end - kve->kve_start;
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map->pr_offset = kve->kve_offset;
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map->pr_mflags = 0;
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if (kve->kve_protection & KVME_PROT_READ)
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map->pr_mflags |= MA_READ;
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if (kve->kve_protection & KVME_PROT_WRITE)
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map->pr_mflags |= MA_WRITE;
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if (kve->kve_protection & KVME_PROT_EXEC)
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map->pr_mflags |= MA_EXEC;
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if (kve->kve_flags & KVME_FLAG_COW)
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map->pr_mflags |= MA_COW;
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if (kve->kve_flags & KVME_FLAG_NEEDS_COPY)
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map->pr_mflags |= MA_NEEDS_COPY;
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if (kve->kve_flags & KVME_FLAG_NOCOREDUMP)
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map->pr_mflags |= MA_NOCOREDUMP;
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strlcpy(map->pr_mapname, kves[lastvn].kve_path,
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sizeof(map->pr_mapname));
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free(kves);
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return (map);
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}
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}
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free(kves);
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return (NULL);
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}
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for (i = 0; i < p->nobjs; i++) {
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rdl = &p->rdobjs[i];
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if (addr >= rdl->rdl_saddr && addr < rdl->rdl_eaddr) {
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if ((map = malloc(sizeof(*map))) == NULL)
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return (NULL);
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proc_rdl2prmap(rdl, map);
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return (map);
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}
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}
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return (NULL);
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}
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int
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proc_addr2sym(struct proc_handle *p, uintptr_t addr, char *name,
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size_t namesz, GElf_Sym *symcopy)
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{
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Elf *e;
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Elf_Scn *scn, *dynsymscn = NULL, *symtabscn = NULL;
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Elf_Data *data;
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GElf_Shdr shdr;
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GElf_Sym sym;
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GElf_Ehdr ehdr;
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int fd, error = -1;
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size_t i;
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uint64_t rsym;
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prmap_t *map;
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char *s;
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unsigned long symtabstridx = 0, dynsymstridx = 0;
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if ((map = proc_addr2map(p, addr)) == NULL)
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return (-1);
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if ((fd = open(map->pr_mapname, O_RDONLY, 0)) < 0) {
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DPRINTF("ERROR: open %s failed", map->pr_mapname);
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goto err0;
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}
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if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
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DPRINTFX("ERROR: elf_begin() failed: %s", elf_errmsg(-1));
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goto err1;
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}
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if (gelf_getehdr(e, &ehdr) == NULL) {
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DPRINTFX("ERROR: gelf_getehdr() failed: %s", elf_errmsg(-1));
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goto err2;
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}
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/*
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* Find the index of the STRTAB and SYMTAB sections to locate
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* symbol names.
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*/
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scn = NULL;
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while ((scn = elf_nextscn(e, scn)) != NULL) {
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gelf_getshdr(scn, &shdr);
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switch (shdr.sh_type) {
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case SHT_SYMTAB:
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symtabscn = scn;
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symtabstridx = shdr.sh_link;
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break;
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case SHT_DYNSYM:
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dynsymscn = scn;
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dynsymstridx = shdr.sh_link;
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break;
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default:
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break;
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}
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}
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/*
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* Iterate over the Dynamic Symbols table to find the symbol.
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* Then look up the string name in STRTAB (.dynstr)
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*/
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if ((data = elf_getdata(dynsymscn, NULL)) == NULL) {
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DPRINTFX("ERROR: elf_getdata() failed: %s", elf_errmsg(-1));
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goto symtab;
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}
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i = 0;
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while (gelf_getsym(data, i++, &sym) != NULL) {
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/*
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* Calculate the address mapped to the virtual memory
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* by rtld.
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*/
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if (ehdr.e_type != ET_EXEC)
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rsym = map->pr_vaddr + sym.st_value;
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else
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rsym = sym.st_value;
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if (addr >= rsym && addr < rsym + sym.st_size) {
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s = elf_strptr(e, dynsymstridx, sym.st_name);
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if (s) {
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demangle(s, name, namesz);
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memcpy(symcopy, &sym, sizeof(sym));
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/*
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* DTrace expects the st_value to contain
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* only the address relative to the start of
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* the function.
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*/
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symcopy->st_value = rsym;
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error = 0;
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goto out;
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}
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}
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}
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symtab:
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/*
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* Iterate over the Symbols Table to find the symbol.
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* Then look up the string name in STRTAB (.dynstr)
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*/
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if ((data = elf_getdata(symtabscn, NULL)) == NULL) {
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DPRINTFX("ERROR: elf_getdata() failed: %s", elf_errmsg(-1));
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goto err2;
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}
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i = 0;
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while (gelf_getsym(data, i++, &sym) != NULL) {
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/*
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* Calculate the address mapped to the virtual memory
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* by rtld.
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*/
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if (ehdr.e_type != ET_EXEC)
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rsym = map->pr_vaddr + sym.st_value;
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else
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rsym = sym.st_value;
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if (addr >= rsym && addr < rsym + sym.st_size) {
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s = elf_strptr(e, symtabstridx, sym.st_name);
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if (s) {
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demangle(s, name, namesz);
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memcpy(symcopy, &sym, sizeof(sym));
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/*
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* DTrace expects the st_value to contain
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* only the address relative to the start of
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* the function.
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*/
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symcopy->st_value = rsym;
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error = 0;
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goto out;
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}
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}
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}
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out:
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err2:
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elf_end(e);
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err1:
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close(fd);
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err0:
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free(map);
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return (error);
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}
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prmap_t *
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proc_name2map(struct proc_handle *p, const char *name)
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{
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size_t i;
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int cnt;
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prmap_t *map;
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char tmppath[MAXPATHLEN];
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struct kinfo_vmentry *kves, *kve;
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rd_loadobj_t *rdl;
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/*
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* If we haven't iterated over the list of loaded objects,
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* librtld_db isn't yet initialized and it's very likely
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* that librtld_db called us. We need to do the heavy
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* lifting here to find the symbol librtld_db is looking for.
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*/
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if (p->nobjs == 0) {
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if ((kves = kinfo_getvmmap(proc_getpid(p), &cnt)) == NULL)
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return (NULL);
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for (i = 0; i < (size_t)cnt; i++) {
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kve = kves + i;
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basename_r(kve->kve_path, tmppath);
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if (strcmp(tmppath, name) == 0) {
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map = proc_addr2map(p, kve->kve_start);
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free(kves);
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return (map);
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}
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}
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free(kves);
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return (NULL);
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}
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if ((name == NULL || strcmp(name, "a.out") == 0) &&
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p->rdexec != NULL) {
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map = proc_addr2map(p, p->rdexec->rdl_saddr);
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return (map);
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}
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for (i = 0; i < p->nobjs; i++) {
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rdl = &p->rdobjs[i];
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basename_r(rdl->rdl_path, tmppath);
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if (strcmp(tmppath, name) == 0) {
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if ((map = malloc(sizeof(*map))) == NULL)
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return (NULL);
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proc_rdl2prmap(rdl, map);
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return (map);
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}
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}
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return (NULL);
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}
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int
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proc_name2sym(struct proc_handle *p, const char *object, const char *symbol,
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GElf_Sym *symcopy)
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{
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Elf *e;
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Elf_Scn *scn, *dynsymscn = NULL, *symtabscn = NULL;
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Elf_Data *data;
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GElf_Shdr shdr;
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GElf_Sym sym;
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GElf_Ehdr ehdr;
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int fd, error = -1;
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size_t i;
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prmap_t *map;
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char *s;
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unsigned long symtabstridx = 0, dynsymstridx = 0;
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if ((map = proc_name2map(p, object)) == NULL) {
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DPRINTFX("ERROR: couldn't find object %s", object);
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goto err0;
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}
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if ((fd = open(map->pr_mapname, O_RDONLY, 0)) < 0) {
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DPRINTF("ERROR: open %s failed", map->pr_mapname);
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goto err0;
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}
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if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
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DPRINTFX("ERROR: elf_begin() failed: %s", elf_errmsg(-1));
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goto err1;
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}
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if (gelf_getehdr(e, &ehdr) == NULL) {
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DPRINTFX("ERROR: gelf_getehdr() failed: %s", elf_errmsg(-1));
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goto err2;
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}
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/*
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* Find the index of the STRTAB and SYMTAB sections to locate
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* symbol names.
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*/
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scn = NULL;
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while ((scn = elf_nextscn(e, scn)) != NULL) {
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gelf_getshdr(scn, &shdr);
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switch (shdr.sh_type) {
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case SHT_SYMTAB:
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symtabscn = scn;
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symtabstridx = shdr.sh_link;
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break;
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case SHT_DYNSYM:
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dynsymscn = scn;
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dynsymstridx = shdr.sh_link;
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break;
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default:
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break;
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}
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}
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/*
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* Iterate over the Dynamic Symbols table to find the symbol.
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* Then look up the string name in STRTAB (.dynstr)
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*/
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if ((data = elf_getdata(dynsymscn, NULL))) {
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i = 0;
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while (gelf_getsym(data, i++, &sym) != NULL) {
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s = elf_strptr(e, dynsymstridx, sym.st_name);
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if (s && strcmp(s, symbol) == 0) {
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memcpy(symcopy, &sym, sizeof(sym));
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if (ehdr.e_type != ET_EXEC)
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symcopy->st_value += map->pr_vaddr;
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error = 0;
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goto out;
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}
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}
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}
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/*
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* Iterate over the Symbols Table to find the symbol.
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* Then look up the string name in STRTAB (.dynstr)
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*/
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if ((data = elf_getdata(symtabscn, NULL))) {
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i = 0;
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while (gelf_getsym(data, i++, &sym) != NULL) {
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s = elf_strptr(e, symtabstridx, sym.st_name);
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if (s && strcmp(s, symbol) == 0) {
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memcpy(symcopy, &sym, sizeof(sym));
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if (ehdr.e_type != ET_EXEC)
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|
symcopy->st_value += map->pr_vaddr;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
DPRINTFX("found addr 0x%lx for %s", symcopy->st_value, symbol);
|
|
err2:
|
|
elf_end(e);
|
|
err1:
|
|
close(fd);
|
|
err0:
|
|
free(map);
|
|
|
|
return (error);
|
|
}
|
|
|
|
|
|
int
|
|
proc_iter_symbyaddr(struct proc_handle *p, const char *object, int which,
|
|
int mask, proc_sym_f *func, void *cd)
|
|
{
|
|
Elf *e;
|
|
int i, fd;
|
|
prmap_t *map;
|
|
Elf_Scn *scn, *foundscn = NULL;
|
|
Elf_Data *data;
|
|
GElf_Ehdr ehdr;
|
|
GElf_Shdr shdr;
|
|
GElf_Sym sym;
|
|
unsigned long stridx = -1;
|
|
char *s;
|
|
int error = -1;
|
|
|
|
if ((map = proc_name2map(p, object)) == NULL)
|
|
return (-1);
|
|
if ((fd = open(map->pr_mapname, O_RDONLY)) < 0) {
|
|
DPRINTF("ERROR: open %s failed", map->pr_mapname);
|
|
goto err0;
|
|
}
|
|
if ((e = elf_begin(fd, ELF_C_READ, NULL)) == NULL) {
|
|
DPRINTFX("ERROR: elf_begin() failed: %s", elf_errmsg(-1));
|
|
goto err1;
|
|
}
|
|
if (gelf_getehdr(e, &ehdr) == NULL) {
|
|
DPRINTFX("ERROR: gelf_getehdr() failed: %s", elf_errmsg(-1));
|
|
goto err2;
|
|
}
|
|
/*
|
|
* Find the section we are looking for.
|
|
*/
|
|
scn = NULL;
|
|
while ((scn = elf_nextscn(e, scn)) != NULL) {
|
|
gelf_getshdr(scn, &shdr);
|
|
if (which == PR_SYMTAB &&
|
|
shdr.sh_type == SHT_SYMTAB) {
|
|
foundscn = scn;
|
|
break;
|
|
} else if (which == PR_DYNSYM &&
|
|
shdr.sh_type == SHT_DYNSYM) {
|
|
foundscn = scn;
|
|
break;
|
|
}
|
|
}
|
|
if (!foundscn)
|
|
return (-1);
|
|
stridx = shdr.sh_link;
|
|
if ((data = elf_getdata(foundscn, NULL)) == NULL) {
|
|
DPRINTFX("ERROR: elf_getdata() failed: %s", elf_errmsg(-1));
|
|
goto err2;
|
|
}
|
|
i = 0;
|
|
while (gelf_getsym(data, i++, &sym) != NULL) {
|
|
if (GELF_ST_BIND(sym.st_info) == STB_LOCAL &&
|
|
(mask & BIND_LOCAL) == 0)
|
|
continue;
|
|
if (GELF_ST_BIND(sym.st_info) == STB_GLOBAL &&
|
|
(mask & BIND_GLOBAL) == 0)
|
|
continue;
|
|
if (GELF_ST_BIND(sym.st_info) == STB_WEAK &&
|
|
(mask & BIND_WEAK) == 0)
|
|
continue;
|
|
if (GELF_ST_TYPE(sym.st_info) == STT_NOTYPE &&
|
|
(mask & TYPE_NOTYPE) == 0)
|
|
continue;
|
|
if (GELF_ST_TYPE(sym.st_info) == STT_OBJECT &&
|
|
(mask & TYPE_OBJECT) == 0)
|
|
continue;
|
|
if (GELF_ST_TYPE(sym.st_info) == STT_FUNC &&
|
|
(mask & TYPE_FUNC) == 0)
|
|
continue;
|
|
if (GELF_ST_TYPE(sym.st_info) == STT_SECTION &&
|
|
(mask & TYPE_SECTION) == 0)
|
|
continue;
|
|
if (GELF_ST_TYPE(sym.st_info) == STT_FILE &&
|
|
(mask & TYPE_FILE) == 0)
|
|
continue;
|
|
s = elf_strptr(e, stridx, sym.st_name);
|
|
if (ehdr.e_type != ET_EXEC)
|
|
sym.st_value += map->pr_vaddr;
|
|
(*func)(cd, &sym, s);
|
|
}
|
|
error = 0;
|
|
err2:
|
|
elf_end(e);
|
|
err1:
|
|
close(fd);
|
|
err0:
|
|
free(map);
|
|
return (error);
|
|
}
|