From 150ee867bda4d89e4aec7cf4908993160943b80a Mon Sep 17 00:00:00 2001
From: Alexander Golubev <fatzer2@gmail.com>
Date: Sun, 25 Aug 2013 21:52:23 +0400
Subject: [PATCH 3/5] kdesktop/lock: use kdBacktrace() in case of fail

---
 CMakeLists.txt                    |   1 -
 config.h.cmake                    |   1 -
 kdesktop/ConfigureChecks.cmake    |   7 -
 kdesktop/lock/CMakeLists.txt      |   8 +-
 kdesktop/lock/backtrace_symbols.c | 325 --------------------------------------
 kdesktop/lock/lockprocess.cc      |  28 +---
 6 files changed, 5 insertions(+), 365 deletions(-)
 delete mode 100644 kdesktop/lock/backtrace_symbols.c

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9bfc941..0ebb514 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -85,7 +85,6 @@ option( WITH_HAL "Enable HAL support" ${WITH_ALL_OPTIONS} )
 option( WITH_TDEHWLIB "Enable TDE hardware library support" OFF )
 option( WITH_UPOWER "Enable UPOWER support" ${WITH_ALL_OPTIONS} )
 option( WITH_GCC_VISIBILITY "Enable fvisibility and fvisibility-inlines-hidden" ${WITH_ALL_OPTIONS} )
-option( WITH_KDESKTOP_LOCK_BACKTRACE "Enable backtrace in kdesktop_lock exception handler"  ${WITH_ALL_OPTIONS} )
 
 ##### options comments ##########################
 
diff --git a/config.h.cmake b/config.h.cmake
index c9b384f..b6dbf19 100644
--- a/config.h.cmake
+++ b/config.h.cmake
@@ -124,7 +124,6 @@
 
 // kdesktop
 #cmakedefine TDESCREENSAVER_PAM_SERVICE "@TDESCREENSAVER_PAM_SERVICE@"
-#cmakedefine WITH_KDESKTOP_LOCK_BACKTRACE 1
 
 // tdm
 #cmakedefine XBINDIR "@XBINDIR@"
diff --git a/kdesktop/ConfigureChecks.cmake b/kdesktop/ConfigureChecks.cmake
index 2d99270..7e5f8a9 100644
--- a/kdesktop/ConfigureChecks.cmake
+++ b/kdesktop/ConfigureChecks.cmake
@@ -12,10 +12,3 @@
 if( WITH_PAM AND (NOT DEFINED TDESCREENSAVER_PAM_SERVICE) )
   set( TDESCREENSAVER_PAM_SERVICE "kde" CACHE INTERNAL "" )
 endif( )
-
-if( WITH_KDESKTOP_LOCK_BACKTRACE )
-  check_include_files( "bfd.h;demangle.h;libiberty.h" HAVE_BINUTILS_DEV )
-  if( NOT HAVE_BINUTILS_DEV )
-    tde_message_fatal( "binutils-dev are required, but not found on your system" )
-  endif( )
-endif( )
diff --git a/kdesktop/lock/CMakeLists.txt b/kdesktop/lock/CMakeLists.txt
index db5e930..03772be 100644
--- a/kdesktop/lock/CMakeLists.txt
+++ b/kdesktop/lock/CMakeLists.txt
@@ -35,13 +35,9 @@ set( ${target}_SRCS
   securedlg.cc autologout.cc main.cc
 )
 
-if( WITH_KDESKTOP_LOCK_BACKTRACE )
-  list( APPEND ${target}_SRCS backtrace_symbols.c )
-  set( BACKTRACE_LIBRARY bfd )
-endif( )
-
 tde_add_executable( ${target} AUTOMOC
   SOURCES ${${target}_SRCS}
-  LINK kdesktopsettings-static dmctl-static tdeio-shared Xext ${BACKTRACE_LIBRARY} ${GL_LIBRARY} "${LINKER_IMMEDIATE_BINDING_FLAGS}"
+  LINK kdesktopsettings-static dmctl-static tdeio-shared Xext
+    ${GL_LIBRARY} "${LINKER_IMMEDIATE_BINDING_FLAGS}"
   DESTINATION ${BIN_INSTALL_DIR}
 )
diff --git a/kdesktop/lock/backtrace_symbols.c b/kdesktop/lock/backtrace_symbols.c
deleted file mode 100644
index 69aa2d7..0000000
--- a/kdesktop/lock/backtrace_symbols.c
+++ /dev/null
@@ -1,325 +0,0 @@
-/*
-  A hacky replacement for backtrace_symbols in glibc
-
-  backtrace_symbols in glibc looks up symbols using dladdr which is limited in
-  the symbols that it sees. libbacktracesymbols opens the executable and shared
-  libraries using libbfd and will look up backtrace information using the symbol
-  table and the dwarf line information.
-
-  It may make more sense for this program to use libelf instead of libbfd.
-  However, I have not investigated that yet.
-
-  Derived from addr2line.c from GNU Binutils by Jeff Muizelaar
-
-  Copyright 2007 Jeff Muizelaar
-  Copyright 2012 Timothy Pearson
-*/
-
-/* addr2line.c -- convert addresses to line number and function name
-   Copyright 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
-   Contributed by Ulrich Lauther <Ulrich.Lauther@mchp.siemens.de>
-
-   This file was part of GNU Binutils.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
-
-#define fatal(a, b) exit(1)
-#define bfd_fatal(a) exit(1)
-#define bfd_nonfatal(a) exit(1)
-#define list_matching_formats(a) exit(1)
-
-/* 2 characters for each byte, plus 1 each for 0, x, and NULL */
-#define PTRSTR_LEN (sizeof(void *) * 2 + 3)
-#define true 1
-#define false 0
-
-#define _GNU_SOURCE
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <execinfo.h>
-#include <bfd.h>
-#include <libiberty.h>
-#include <dlfcn.h>
-#include <link.h>
-#include <demangle.h>
-
-
-static asymbol **syms;		/* Symbol table.  */
-
-/* 150 isn't special; it's just an arbitrary non-ASCII char value.  */
-#define OPTION_DEMANGLER	(150)
-
-static void slurp_symtab(bfd * abfd);
-static void find_address_in_section(bfd *abfd, asection *section, void *data);
-
-/* Read in the symbol table.  */
-
-static void slurp_symtab(bfd * abfd)
-{
-	long symcount;
-	unsigned int size;
-
-	if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
-		return;
-
-	symcount = (long)bfd_read_minisymbols(abfd, false, (void**) & syms, &size);
-	if (symcount == 0)
-		symcount = bfd_read_minisymbols(abfd, true /* dynamic */ ,
-						(void**) & syms, &size);
-
-	if (symcount < 0)
-		bfd_fatal(bfd_get_filename(abfd));
-}
-
-/* These global variables are used to pass information between
-   translate_addresses and find_address_in_section.  */
-
-static bfd_vma pc;
-static const char *filename;
-static const char *functionname;
-static unsigned int line;
-static int found;
-
-/* Look for an address in a section.  This is called via
-   bfd_map_over_sections.  */
-
-static void find_address_in_section(bfd *abfd, asection *section, void *data __attribute__ ((__unused__)) )
-{
-	bfd_vma vma;
-	bfd_size_type size;
-
-	if (found)
-		return;
-
-	if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
-		return;
-
-	vma = bfd_get_section_vma(abfd, section);
-	if (pc < vma)
-		return;
-
-	size = bfd_section_size(abfd, section);
-	if (pc >= vma + size)
-		return;
-
-	found = bfd_find_nearest_line(abfd, section, syms, pc - vma,
-				      &filename, &functionname, &line);
-}
-
-/* Read hexadecimal addresses from stdin, translate into
-   file_name:line_number and optionally function name.  */
-
-enum { Count, Print };
-
-static char** translate_addresses_buf(bfd * abfd, bfd_vma *addr, int naddr)
-{
-	int naddr_orig = naddr;
-	char b;
-	int total  = 0;
-	int state;
-	char *buf = &b;
-	int len = 0;
-	char **ret_buf = NULL;
-
-	/* iterate over the formating twice.
-	 * the first time we count how much space we need
-	 * the second time we do the actual printing */
-	for (state=Count; state<=Print; state++) {
-		if (state == Print) {
-			ret_buf = (char**)malloc(total + sizeof(char*)*naddr);
-			buf = (char*)(ret_buf + naddr);
-			len = total;
-		}
-		while (naddr) {
-			if (state == Print)
-				ret_buf[naddr-1] = buf;
-			pc = addr[naddr-1];
-	
-			found = false;
-			bfd_map_over_sections(abfd, find_address_in_section,
-			(PTR) NULL);
-	
-			if (!found) {
-				total += snprintf(buf, len, "[0x%llx] \?\?() \?\?:0",(long long unsigned int) addr[naddr-1]) + 1;
-			} else {
-				const char *name;
-	
-				name = functionname;
-				if (name == NULL || *name == '\0')
-					name = "??";
-				if (filename != NULL) {
-					const char *h;
-	
-					h = strrchr(filename, '/');
-					if (h != NULL)
-						filename = h + 1;
-				}
-	
-				char* funcname = cplus_demangle(name, DMGL_AUTO);
-				if (funcname) {
-					// demangling succeeded
-					total += snprintf(buf, len, "%s:%u\t%s()", filename ? filename : "??", line, funcname) + 1;
-				}
-				else {
-					// demangling failed
-					total += snprintf(buf, len, "%s:%u\t%s()", filename ? filename : "??", line, name) + 1;
-				}
-			}
-			if (state == Print) {
-				/* set buf just past the end of string */
-				buf = buf + total + 1;
-			}
-			naddr--;
-		}
-		naddr = naddr_orig;
-	}
-	return ret_buf;
-}
-/* Process a file.  */
-
-static char **process_file(const char *file_name, bfd_vma *addr, int naddr)
-{
-	bfd *abfd;
-	char **matching;
-	char **ret_buf;
-
-	abfd = bfd_openr(file_name, NULL);
-
-	if (abfd == NULL)
-		bfd_fatal(file_name);
-
-	if (bfd_check_format(abfd, bfd_archive))
-		fatal("%s: can not get addresses from archive", file_name);
-
-	if (!bfd_check_format_matches(abfd, bfd_object, &matching)) {
-		bfd_nonfatal(bfd_get_filename(abfd));
-		if (bfd_get_error() ==
-		    bfd_error_file_ambiguously_recognized) {
-			list_matching_formats(matching);
-			free(matching);
-		}
-		xexit(1);
-	}
-
-	slurp_symtab(abfd);
-
-	ret_buf = translate_addresses_buf(abfd, addr, naddr);
-
-	if (syms != NULL) {
-		free(syms);
-		syms = NULL;
-	}
-
-	bfd_close(abfd);
-	return ret_buf;
-}
-
-#define MAX_DEPTH 16
-
-struct file_match {
-	const char *file;
-	void *address;
-	void *base;
-	void *hdr;
-};
-
-static int find_matching_file(struct dl_phdr_info *info,
-		size_t size, void *data)
-{
-	struct file_match *match = data;
-	/* This code is modeled from Gfind_proc_info-lsb.c:callback() from libunwind */
-	long n;
-	const ElfW(Phdr) *phdr;
-	ElfW(Addr) load_base = info->dlpi_addr;
-	phdr = info->dlpi_phdr;
-	for (n = info->dlpi_phnum; --n >= 0; phdr++) {
-		if (phdr->p_type == PT_LOAD) {
-			ElfW(Addr) vaddr = phdr->p_vaddr + load_base;
-			if (match->address >= (void*)vaddr && match->address < (void*)(vaddr + phdr->p_memsz)) {
-				/* we found a match */
-				match->file = info->dlpi_name;
-				match->base = (void*)info->dlpi_addr;
-			}
-		}
-	}
-	return 0;
-}
-
-char **backtrace_symbols(void *const *buffer, int size)
-{
-	int stack_depth = size - 1;
-	int x,y;
-	/* discard calling function */
-	int total = 0;
-
-	char ***locations;
-	char **final;
-	char *f_strings;
-
-	locations = (char***)malloc(sizeof(char**) * (stack_depth+1));
-
-	bfd_init();
-	for(x=stack_depth, y=0; x>=0; x--, y++){
-		struct file_match match = { .address = buffer[x] };
-		char **ret_buf;
-		bfd_vma addr;
-		dl_iterate_phdr(find_matching_file, &match);
-		addr = buffer[x] - match.base;
-		if (match.file && strlen(match.file))
-			ret_buf = process_file(match.file, &addr, 1);
-		else
-			ret_buf = process_file("/proc/self/exe", &addr, 1);
-		locations[x] = ret_buf;
-		total += strlen(ret_buf[0]) + 1;
-	}
-
-	/* allocate the array of char* we are going to return and extra space for
-	 * all of the strings */
-	final = (char**)malloc(total + (stack_depth + 1) * sizeof(char*));
-	/* get a pointer to the extra space */
-	f_strings = (char*)(final + stack_depth + 1);
-
-	/* fill in all of strings and pointers */
-	for(x=stack_depth; x>=0; x--){
-		strcpy(f_strings, locations[x][0]);
-		free(locations[x]);
-		final[x] = f_strings;
-		f_strings += strlen(f_strings) + 1;
-	}
-
-	free(locations);
-
-	return final;
-}
-
-void
-backtrace_symbols_fd(void *const *buffer, int size, int fd)
-{
-        int j;
-        char **strings;
-
-        strings = backtrace_symbols(buffer, size);
-        if (strings == NULL) {
-		perror("backtrace_symbols");
-		exit(EXIT_FAILURE);
-        }
-
-        for (j = 0; j < size; j++)
-		printf("%s\n", strings[j]);
-
-        free(strings);
-}
-
diff --git a/kdesktop/lock/lockprocess.cc b/kdesktop/lock/lockprocess.cc
index f482dcd..5bd92bd 100644
--- a/kdesktop/lock/lockprocess.cc
+++ b/kdesktop/lock/lockprocess.cc
@@ -22,8 +22,6 @@
 
 #include <config.h>
 
-#include <execinfo.h>
-
 #include "lockprocess.h"
 #include "lockdlg.h"
 #include "infodlg.h"
@@ -141,31 +139,11 @@ Atom kde_wm_system_modal_notification = 0;
 Atom kde_wm_transparent_to_desktop = 0;
 Atom kde_wm_transparent_to_black = 0;
 
-void print_trace()
-{
-#ifdef WITH_KDESKTOP_LOCK_BACKTRACE
-	void *array[10];
-	size_t size;
-	char **strings;
-	size_t i;
-
-	size = backtrace (array, 10);
-	strings = backtrace_symbols (array, size);
-
-	printf ("[kdesktop_lock] Obtained %zd stack frames.\n", size);
-
-	for (i = 0; i < size; i++) {
-		printf ("[kdesktop_lock] %s\n", strings[i]);
-	}
-
-	free (strings);
-#endif
-}
-
 static void segv_handler(int)
 {
-	printf("[kdesktop_lock] WARNING: A fatal exception was encountered.  Trapping and ignoring it so as not to compromise desktop security...\n");
-	print_trace();
+	kdError(1204) << "A fatal exception was encountered." 
+		<< " Trapping and ignoring it so as not to compromise desktop security..." 
+		<< kdBacktrace() << endl;
 	sleep(1);
 }
 
-- 
1.8.1.5

