1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*****************************************************************
* drkonqi - The KDE Crash Handler
*
* Copyright (C) 2000-2003 Hans Petter Bieker <bieker@kde.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************/
#include <tqfile.h>
#include <tqregexp.h>
#include <kprocess.h>
#include <kdebug.h>
#include <kstandarddirs.h>
#include <tdemessagebox.h>
#include <tdelocale.h>
#include <tdetempfile.h>
#include "krashconf.h"
#include "backtrace.h"
#include "backtrace.moc"
BackTrace::BackTrace(const KrashConfig *krashconf, TQObject *parent,
const char *name)
: TQObject(parent, name),
m_krashconf(krashconf), m_temp(NULL), m_temp_cmd(NULL)
{
m_proc = new TDEProcess;
}
BackTrace::~BackTrace()
{
pid_t pid = m_proc ? m_proc->pid() : 0;
// we don't want the gdb process to hang around
delete m_proc; // this will kill gdb (SIGKILL, signal 9)
// continue the process we ran backtrace on. Gdb sends SIGSTOP to the
// process. For some reason it doesn't work if we send the signal before
// gdb has exited, so we better wait for it.
// Do not touch it if we never ran backtrace.
if (pid)
{
waitpid(pid, NULL, 0);
kill(m_krashconf->pid(), SIGCONT);
}
delete m_temp;
delete m_temp_cmd;
}
void BackTrace::start()
{
TQString exec = m_krashconf->tryExec();
if ( !exec.isEmpty() && TDEStandardDirs::findExe(exec).isEmpty() )
{
TQObject * o = parent();
if (o && !o->inherits(TQWIDGET_OBJECT_NAME_STRING))
{
o = NULL;
}
KMessageBox::error(
(TQWidget *)o,
i18n("Could not generate a backtrace as the debugger '%1' was not found.").arg(exec));
return;
}
m_temp = new KTempFile;
m_temp->setAutoDelete(TRUE);
int handle = m_temp->handle();
TQString backtraceCommand = m_krashconf->backtraceCommand();
const char* bt = backtraceCommand.latin1();
::write(handle, bt, strlen(bt)); // the command for a backtrace
::write(handle, "\n", 1);
::fsync(handle);
// build the debugger command
TQString str = m_krashconf->debuggerBatch();
m_krashconf->expandString(str, true, m_temp->name());
// write the debugger command
m_temp_cmd = new KTempFile(TQString::null, TQString::null, 0700);
m_temp_cmd->setAutoDelete(TRUE);
handle = m_temp_cmd->handle();
const char* dbgcommand = str.latin1();
::write(handle, dbgcommand, strlen(dbgcommand)); // the command to execute the debugger
::write(handle, "\n", 1);
::fsync(handle);
m_temp_cmd->close();
// determine if yama has been used to prevent ptrace as normal user
bool need_root_access = false;
TQFile yamactl("/proc/sys/kernel/yama/ptrace_scope");
if (yamactl.exists()) {
if (yamactl.open(IO_ReadOnly)) {
TQTextStream stream(&yamactl);
TQString line;
line = stream.readLine();
if (line.toInt() != 0) {
need_root_access = true;
}
yamactl.close();
}
}
// start the debugger
m_proc = new TDEProcess;
m_proc->setUseShell(true);
if (need_root_access == false) {
*m_proc << m_temp_cmd->name();
}
else {
*m_proc << "tdesu -t --comment \"" << i18n("Administrative access is required to generate a backtrace") << "\" -c \"" << m_temp_cmd->name() << "\"";
}
connect(m_proc, TQT_SIGNAL(receivedStdout(TDEProcess*, char*, int)),
TQT_SLOT(slotReadInput(TDEProcess*, char*, int)));
connect(m_proc, TQT_SIGNAL(processExited(TDEProcess*)),
TQT_SLOT(slotProcessExited(TDEProcess*)));
m_proc->start ( TDEProcess::NotifyOnExit, TDEProcess::All );
}
void BackTrace::slotReadInput(TDEProcess *, char* buf, int buflen)
{
TQString newstr = TQString::fromLocal8Bit(buf, buflen);
newstr.replace("\n\n", "\n");
if (m_strBt.isEmpty()) {
if (newstr == "\n") {
newstr = "";
}
}
if (!newstr.startsWith(": ")) {
m_strBt.append(newstr);
emit append(newstr);
}
}
void BackTrace::slotProcessExited(TDEProcess *proc)
{
// start it again
kill(m_krashconf->pid(), SIGCONT);
if (proc->normalExit() && (proc->exitStatus() == 0) &&
usefulBacktrace())
{
processBacktrace();
emit done(m_strBt);
}
else
emit someError();
}
// analyze backtrace for usefulness
bool BackTrace::usefulBacktrace()
{
// remove crap
if( !m_krashconf->removeFromBacktraceRegExp().isEmpty())
m_strBt.replace(TQRegExp( m_krashconf->removeFromBacktraceRegExp()), TQString());
if( m_krashconf->disableChecks())
return true;
// prepend and append newline, so that regexps like '\nwhatever\n' work on all lines
TQString strBt = '\n' + m_strBt + '\n';
// how many " ?? " in the bt ?
int unknown = 0;
if( !m_krashconf->invalidStackFrameRegExp().isEmpty())
unknown = strBt.contains( TQRegExp( m_krashconf->invalidStackFrameRegExp()));
// how many stack frames in the bt ?
int frames = 0;
if( !m_krashconf->frameRegExp().isEmpty())
frames = strBt.contains( TQRegExp( m_krashconf->frameRegExp()));
else
frames = strBt.contains('\n');
bool tooShort = false;
if( !m_krashconf->neededInValidBacktraceRegExp().isEmpty())
tooShort = ( strBt.find( TQRegExp( m_krashconf->neededInValidBacktraceRegExp())) == -1 );
return !m_strBt.isNull() && !tooShort && (unknown < frames);
}
// remove stack frames added because of TDECrash
void BackTrace::processBacktrace()
{
if( !m_krashconf->kcrashRegExp().isEmpty())
{
TQRegExp kcrashregexp( m_krashconf->kcrashRegExp());
int pos = kcrashregexp.search( m_strBt );
if( pos >= 0 )
{
int len = kcrashregexp.matchedLength();
if( m_strBt[ pos ] == '\n' )
{
++pos;
--len;
}
m_strBt.remove( pos, len );
m_strBt.insert( pos, TQString::fromLatin1( "[TDECrash handler]\n" ));
}
}
}
|
