大統一Debian勉強会 gdb+python拡張を使ったデバッグ手法

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あいとたかはし
6 years ago
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1 Debian 2013 gdb+python

2 Level Debian Up

3 Debian

4 Debian debian sid unstable

5 Debian debian sid unstable *-dbg

6 Debian debian sid unstable *-dbg gdb

7 Debian debian sid unstable *-dbg gdb gdb python

8 Debian!

9 Debian! debian sid unstable level up debian sid unstable!

10 Debian! debian sid unstable level up debian sid unstable! *-dbg aptitude install XXXX-dbg XXXX

11 Debian! debian sid unstable level up debian sid unstable! *-dbg aptitude install XXXX-dbg XXXX gdb /gdb python

12 Debian

13 Debian 1 Debian debian sid (jessie/sid) 2 CPU amd64 ( i386 3 OS linux 4 php version (debian sid ) 5 gdb version 7.6 (debian sid ) kfreebsd Hurd ARM CPU......

15 *-dbg Debian *-dbg debian *-dbg 2012 Debian debug.debian.net http: // gum. debian. or. jp/ 2012/ ( )

16 gdb+python Debian gdb+python 98 Debian http: // tokyodebian. alioth. debian. org/ html ( )

17 *-dbg

18 *-dbg Debian 1 *-dbg -dbg 2 COMPATIBILITY LEVEL 9 : COMPATIBILITY LEVEL 9 : BuildID 3 COMPATIBILITY LEVEL 9 : /usr/lib/debug/ /usr/bin/php5 /usr/lib/debug/usr/bin/php5 COMPATIBILITY LEVEL 9 : /usr/lib/debug/.build-id/

19 *-dbg *-dbg $ cat /etc/debian_version jessie/sid $ aptitude search.*-dbg p 0ad-dbg - Real-time strategy game of p 389-ds-base-dbg Directory Server suite p 389-ds-base-libs-dbg Directory Server suite p 7kaa-dbg - Seven Kingdoms Ancient $ aptitude search.*-dbg wc -l 2272 $ debian sid(jessie/sid) 2272

20 *-dbg php5 $ aptitude install php5-dbg $ apt-get source php5/sid $ ls php dfsg php5_5.5.0+dfsg-1.dsc php5_5.5.0+dfsg-1.debian.tar.gz php5_5.5.0+dfsg.orig.tar.xz $ pwd /home/yours/php5-src/ $ gdb --args /usr/bin/php5 -r phpinfo() (gdb) set substitute-path /tmp/buildd/ /home/yours/php5-src/ (gdb) b main (gdb) run (gdb) l 1197 #else 1198 int main(int argc, char *argv[]) 1199 #endif 1200 { 1201 #ifdef ZTS 1202 void ***tsrm_ls;

21 COMPATIBILITY LEVEL Debian debhelper COMPATIBILITY LEVEL debian/ debian sid LEVEL debian/compat COMPATIBILITY LEVEL $ apt-get source php5 $ cat php dfsg/debian/compat 5 $ apt-get source gstreamer0.10 $ cat gstreamer /debian/compat 9

22 COMPATIBILITY LEVEL 9 *-dbg debhelper COMPATIBILITY LEVEL 9 *-dbg php5-dbg $ dpkg -L php5-dbg /usr/lib/debug /usr/lib/debug/usr /usr/lib/debug/usr/bin /usr/lib/debug/usr/bin/php5 /usr/lib/debug/usr/bin/php5-cgi /usr/lib/debug/usr/sbin /usr/lib/debug/usr/sbin/php5-fpm $ php5 /usr/bin/php5 /usr/lib/debug/usr/bin/php5

23 COMPATIBILITY LEVEL 9 *-dbg debhelper COMPATIBILITY LEVEL 9 *-dbg libgstreamer dbg $ dpkg -L libgstreamer dbg /usr/lib/debug/.build-id/3f/bdb d00e153a2fc6c ca28acad.debug /usr/lib/debug/.build-id/86 /usr/lib/debug/.build-id/86/cc80bb6f2bdb31a2ed02973d 54530b3d99846f.debug /usr/lib/debug/.build-id/44 /usr/lib/debug/.build-id/44/ff321f11ffd750f8c351ffa3 f5d20028d2f6a6.debug /usr/share /usr/share/doc $

24 COMPATIBILITY LEVEL 9 *-dbg $ file /usr/lib/x86_64-linux-gnu/libgstreamer so /usr/lib/x86_64-linux-gnu/libgstreamer-0.10.so : ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, BuildID[sha1]=44ff321f11ffd750f8c351ffa3f5d20028d2f6a6, stripped $ BuildID[sha1] /usr/lib/debug/.buildid/44/ff321f11ffd750f8c351ffa3f5d20028d2f6a6.debug libgstreamer-0.10.so

25 BuildID ID $ readelf -n /usr/lib/x86_64-linux-gnu/libgstreamer so.0 Notes at offset 0x000001c8 with length 0x : Owner Data size Description GNU 0x NT_GNU_BUILD_ID Build ID: 44ff321f11ffd750f8c351ffa3f5d20028d2f6a6 BuildID BuildID BuildID BuildID binutils msg00012.html

26 gdb.gnu_debuglink $ readelf -x.gnu_debuglink /usr/bin/php5 Hex dump of section.gnu_debuglink : 0x dd10 php $ readelf -x.gnu_debuglink /usr/lib/x86_64-linux-gnu/ libgstreamer-0.10.so Hex dump of section.gnu_debuglink : 0x ff321f11ffd750f8 0x c351ffa3f5d x d2f6a6.debug... 0x da0b0f5... php5 php5 libgstreamer-0.10.so ff321f11ffd750f8c351ffa3f5d20028d2f6a6.debug

27 /usr/bin/php5 gdb set substitute-path $ gdb --args /usr/bin/gst-launch (gdb) set substitute-path /tmp/buildd/ /home/yours/gstreamer/ (gdb) b main (gdb) run Breakpoint 1, main at gst-run.c: gst-run.c:.

28 gst-launch gstreamer gcc (php5 gcc gdb dir

29 gdb dir $ gdb --args /usr/bin/gst-launch (gdb) dir /home/yours/gstreamer/gstreamer / tools (gdb) b main (gdb) run (gdb) l 314 } int 317 main (int argc, char **argv) 318 { 319 GHashTable *candidates; 320 gchar *dir;

30 dir gdb dir gdb dir

31 2013/7/22( ) 2013/7/20( ) Debian Debhelper dir set substitue-path

32 gdb+python gdb.value

33 gdb+python gdb python gdb python-interactive python $ gdb (gdb) pi >>> import sys >>> print sys.version_info sys.version_info(major=2, minor=7, micro=5, releaselevel= final, serial=0) >>> gdb python 1 gdb 7.6 released!

34 gdb.value gdb python gdb.value 1 structure gdb.value structure 2 python 3 structure 4

35 gdb.value $ sudo aptitude install php5-dbg $ cat./phpinfo.php <?php phpinfo()?> $ gdb --args /usr/bin/php5./phpinfo.php (gdb) b zend_vm_execute.h:356 (gdb) run (gdb) pi >>> edata=gdb.parse_and_eval(... "executor_globals.current_execute_data") >>> print edata.address 0xe60920 <executor_globals+1120> >>> print edata.dereference() {opline = 0x7ffff7fbd778, function_state = {function = 0x7ffff7fbd498, arguments = 0x0},......,call = 0x0} >>> print edata[ op_array ][ filename ] 0x7ffff7fbd640 "/home/yours/phpinfo.php" >>> [Ctrl+D]

36 gdb.value $ gdb --args /usr/bin/php5./phpinfo.php (gdb) b zend_vm_execute.h:356 (gdb) run (gdb) pi >>> phpfile=(gdb.parse_and_eval(... "zend_get_executed_filename")).dereference() >>> print phpfile {const char *(void)} 0x6c7600 <zend_get_executed_filename> >>> print phpfile() 0x7ffff7fc4418 "/home/yours/phpinfo.php >>> [Ctrl+D] (gdb)

37 gdb.value gdb.value str() gdb p pointer str.partition(" ") $ gdb --args /usr/bin/php5./phpinfo.php (gdb) b zend_vm_execute.h:356 (gdb) run (gdb) pi >>> phpfile=(gdb.parse_and_eval(... "zend_get_executed_filename")).dereference() >>> filename=phpfile() >>> print str(filename) 0x7ffff7fc4418 "/home/yours/phpinfo.php" >>> print (str(filename).partition(" "))[2] "/home/yours/phpinfo.php"

38 php5.5.0

39 php5.5.0 php5.5.0 execute_ex()(zend/zend_vm_execue.h) execute_internal()(zend/zend_execute.c) php C

40 gdb execute_ex() gdb Zend/zend_vm_execute.h 330 ZEND_API void execute_ex(zend_execute_data *execute_data TSRMLS_DC) 331 { 332 DCL_OPLINE 333 zend_bool original_in_execution; if ((ret = OPLINE->handler( <--- execute_data TSRMLS_CC)) > 0) { 357 switch (ret) {

41 php5.5.0 API php5.5.0 Zend Engine API zend_get_executed_filename() (Zend/zend_execute_API.c) php get_active_function_name() (Zend/zend_execute_API.c) zend_get_executed_lineno() (Zend/zend_execute_API.c)

42 php

43 gdb php php xdebug vim-nox+debugger plugin/netbean/eclipse php xdebug gdb php

44 php 7/22( ): debianmeetingresume2013-gum.pdf

45 gdb+python php gdb python php php gdb php php executor_globals php5.5.0 Zend API php API gdb php

ex01.dvi

ex01.dvi ,. 0. 0.0. C () /******************************* * $Id: ex_0_0.c,v.2 2006-04-0 3:37:00+09 naito Exp $ * * 0. 0.0 *******************************/ #include int main(int argc, char **argv) double