《coredump问题原理探究》Linux x86版7.6节 Map coredump例子

定位一个map相关的coredump来熟悉一下:

 

Core was generated by `./xuzhina_dump_c07_s3_ex 5 / 6'.
Program terminated with signal 11, Segmentation fault.
#0  0x00000000 in ?? ()
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.149.el6_6.4.i686 libgcc-4.4.7-11.el6.i686 libstdc++-4.4.7-11.el6.i686
(gdb) bt
#0  0x00000000 in ?? ()
#1  0x08048bd0 in main ()
(gdb) i r 
eax            0x5	5
ecx            0x0	0
edx            0x0	0
ebx            0x6	6
esp            0xbfd3de7c	0xbfd3de7c
ebp            0xbfd3dee8	0xbfd3dee8
esi            0x0	0
edi            0x0	0
eip            0x0	0
eflags         0x210296	[ PF AF SF IF RF ID ]
cs             0x73	115
ss             0x7b	123
ds             0x7b	123
es             0x7b	123
fs             0x0	0
gs             0x33	51

 

 

 

由于栈顶的指令地址为0x0,而eip的值也是0x0,可以知道是调用了函数指针,且函数指针的值为空.而这个函数指针是由main函数调用

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