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
#define hello "Hello World!\n"

int
main(void)
{
write(1, hello, 13);
return (0);
}
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