272fa18170
When xorg_backtrace calls unw_get_proc_name and an error occurs, offset might not be set for the current frame. Initialize offset for each frame so that the offset from another frame cannot be used inadvertently. Signed-off-by: Jeff Smith <whydoubt@gmail.com> Reviewed-by: Adam Jackson <ajax@redhat.com>
326 lines
8.3 KiB
C
326 lines
8.3 KiB
C
/*
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* Copyright 2008 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include "os.h"
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#include "misc.h"
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#include <errno.h>
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#include <string.h>
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#ifdef HAVE_LIBUNWIND
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#define UNW_LOCAL_ONLY
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#include <libunwind.h>
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <dlfcn.h>
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void
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xorg_backtrace(void)
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{
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unw_cursor_t cursor;
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unw_context_t context;
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unw_word_t off;
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unw_proc_info_t pip;
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int ret, i = 0;
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char procname[256];
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const char *filename;
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Dl_info dlinfo;
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pip.unwind_info = NULL;
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ret = unw_getcontext(&context);
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if (ret) {
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ErrorFSigSafe("unw_getcontext failed: %s [%d]\n", unw_strerror(ret),
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ret);
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return;
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}
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ret = unw_init_local(&cursor, &context);
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if (ret) {
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ErrorFSigSafe("unw_init_local failed: %s [%d]\n", unw_strerror(ret),
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ret);
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return;
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}
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ErrorFSigSafe("\n");
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ErrorFSigSafe("Backtrace:\n");
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ret = unw_step(&cursor);
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while (ret > 0) {
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ret = unw_get_proc_info(&cursor, &pip);
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if (ret) {
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ErrorFSigSafe("unw_get_proc_info failed: %s [%d]\n",
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unw_strerror(ret), ret);
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break;
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}
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off = 0;
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ret = unw_get_proc_name(&cursor, procname, 256, &off);
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if (ret && ret != -UNW_ENOMEM) {
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if (ret != -UNW_EUNSPEC)
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ErrorFSigSafe("unw_get_proc_name failed: %s [%d]\n",
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unw_strerror(ret), ret);
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procname[0] = '?';
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procname[1] = 0;
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}
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if (dladdr((void *)(uintptr_t)(pip.start_ip + off), &dlinfo) && dlinfo.dli_fname &&
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*dlinfo.dli_fname)
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filename = dlinfo.dli_fname;
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else
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filename = "?";
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ErrorFSigSafe("%u: %s (%s%s+0x%x) [%p]\n", i++, filename, procname,
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ret == -UNW_ENOMEM ? "..." : "", (int)off,
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(void *)(uintptr_t)(pip.start_ip + off));
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ret = unw_step(&cursor);
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if (ret < 0)
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ErrorFSigSafe("unw_step failed: %s [%d]\n", unw_strerror(ret), ret);
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}
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ErrorFSigSafe("\n");
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}
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#else /* HAVE_LIBUNWIND */
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#ifdef HAVE_BACKTRACE
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <dlfcn.h>
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#include <execinfo.h>
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void
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xorg_backtrace(void)
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{
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const int BT_SIZE = 64;
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void *array[BT_SIZE];
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const char *mod;
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int size, i;
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Dl_info info;
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ErrorFSigSafe("\n");
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ErrorFSigSafe("Backtrace:\n");
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size = backtrace(array, BT_SIZE);
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for (i = 0; i < size; i++) {
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int rc = dladdr(array[i], &info);
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if (rc == 0) {
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ErrorFSigSafe("%u: ?? [%p]\n", i, array[i]);
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continue;
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}
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mod = (info.dli_fname && *info.dli_fname) ? info.dli_fname : "(vdso)";
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if (info.dli_saddr)
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ErrorFSigSafe(
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"%u: %s (%s+0x%x) [%p]\n",
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i,
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mod,
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info.dli_sname,
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(unsigned int)((char *) array[i] -
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(char *) info.dli_saddr),
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array[i]);
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else
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ErrorFSigSafe(
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"%u: %s (%p+0x%x) [%p]\n",
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i,
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mod,
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info.dli_fbase,
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(unsigned int)((char *) array[i] -
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(char *) info.dli_fbase),
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array[i]);
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}
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ErrorFSigSafe("\n");
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}
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#else /* not glibc or glibc < 2.1 */
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#if defined(__sun) && defined(__SVR4)
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#define HAVE_PSTACK
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#endif
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#if defined(HAVE_WALKCONTEXT) /* Solaris 9 & later */
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#include <ucontext.h>
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#include <signal.h>
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#include <dlfcn.h>
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#include <sys/elf.h>
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#ifdef _LP64
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#define ElfSym Elf64_Sym
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#else
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#define ElfSym Elf32_Sym
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#endif
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/* Called for each frame on the stack to print it's contents */
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static int
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xorg_backtrace_frame(uintptr_t pc, int signo, void *arg)
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{
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Dl_info dlinfo;
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ElfSym *dlsym;
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char header[32];
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int depth = *((int *) arg);
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if (signo) {
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char signame[SIG2STR_MAX];
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if (sig2str(signo, signame) != 0) {
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strcpy(signame, "unknown");
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}
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ErrorFSigSafe("** Signal %u (%s)\n", signo, signame);
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}
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snprintf(header, sizeof(header), "%d: 0x%lx", depth, pc);
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*((int *) arg) = depth + 1;
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/* Ask system dynamic loader for info on the address */
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if (dladdr1((void *) pc, &dlinfo, (void **) &dlsym, RTLD_DL_SYMENT)) {
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unsigned long offset = pc - (uintptr_t) dlinfo.dli_saddr;
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const char *symname;
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if (offset < dlsym->st_size) { /* inside a function */
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symname = dlinfo.dli_sname;
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}
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else { /* found which file it was in, but not which function */
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symname = "<section start>";
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offset = pc - (uintptr_t) dlinfo.dli_fbase;
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}
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ErrorFSigSafe("%s: %s:%s+0x%x\n", header, dlinfo.dli_fname, symname,
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offset);
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}
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else {
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/* Couldn't find symbol info from system dynamic loader, should
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* probably poke elfloader here, but haven't written that code yet,
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* so we just print the pc.
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*/
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ErrorFSigSafe("%s\n", header);
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}
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return 0;
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}
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#endif /* HAVE_WALKCONTEXT */
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#ifdef HAVE_PSTACK
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static int
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xorg_backtrace_pstack(void)
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{
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pid_t kidpid;
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int pipefd[2];
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if (pipe(pipefd) != 0) {
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return -1;
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}
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kidpid = fork1();
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if (kidpid == -1) {
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/* ERROR */
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return -1;
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}
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else if (kidpid == 0) {
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/* CHILD */
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char parent[16];
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seteuid(0);
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close(STDIN_FILENO);
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close(STDOUT_FILENO);
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dup2(pipefd[1], STDOUT_FILENO);
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closefrom(STDERR_FILENO);
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snprintf(parent, sizeof(parent), "%d", getppid());
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execle("/usr/bin/pstack", "pstack", parent, NULL);
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exit(1);
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}
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else {
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/* PARENT */
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char btline[256];
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int kidstat;
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int bytesread;
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int done = 0;
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close(pipefd[1]);
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while (!done) {
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bytesread = read(pipefd[0], btline, sizeof(btline) - 1);
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if (bytesread > 0) {
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btline[bytesread] = 0;
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ErrorFSigSafe("%s", btline);
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}
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else if ((bytesread < 0) || ((errno != EINTR) && (errno != EAGAIN)))
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done = 1;
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}
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close(pipefd[0]);
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waitpid(kidpid, &kidstat, 0);
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if (kidstat != 0)
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return -1;
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}
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return 0;
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}
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#endif /* HAVE_PSTACK */
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#if defined(HAVE_PSTACK) || defined(HAVE_WALKCONTEXT)
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void
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xorg_backtrace(void)
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{
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ErrorFSigSafe("\n");
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ErrorFSigSafe("Backtrace:\n");
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#ifdef HAVE_PSTACK
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/* First try fork/exec of pstack - otherwise fall back to walkcontext
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pstack is preferred since it can print names of non-exported functions */
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if (xorg_backtrace_pstack() < 0)
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#endif
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{
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#ifdef HAVE_WALKCONTEXT
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ucontext_t u;
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int depth = 1;
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if (getcontext(&u) == 0)
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walkcontext(&u, xorg_backtrace_frame, &depth);
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else
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#endif
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ErrorFSigSafe("Failed to get backtrace info: %s\n", strerror(errno));
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}
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ErrorFSigSafe("\n");
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}
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#else
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/* Default fallback if we can't find any way to get a backtrace */
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void
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xorg_backtrace(void)
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{
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return;
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}
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#endif
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#endif
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#endif
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