Messages in this thread | | | Date | Thu, 27 Mar 2008 01:55:47 +0800 | From | "bbb arc" <> | Subject | problem with userland exec() |
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i am trying grugq's userland exec() [1] but is unable to run with my simple static linked hello world program [2]
because of the random stack start address,I tried added the following three lines in the save.c:ul_setup_stack():
stack_top = mmap(0,0x16000, PROT_WRITE |PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS|MAP_GROWSDOWN,-1,0);// test stack_top +=0x16000;
the program still segmentation fault at memcpy: 0x804d95f: rep movsl %ds:(%esi),%es:(%edi)
Does anyone have ideas about it?
Kind Regards, arcbbb
[1] http://www.phrack.org/issues.html?issue=62&id=8 [2] my simple hello world compiled with gcc -g -static #include <unistd.h> #define hello "Hello World!\n"
int main(void) { write(1, hello, 13); return (0); }
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