Hello all,

I tried mmap'ing to address zero after setting /proc/sys/vm/mmap_min_addr to 0, but mmap is giving Permission Denied error.

My C code is as below - 

#include <stdio.h>

#include <stdlib.h>

#include <sys/mman.h>

int main(void)

{

int *ptr = NULL;

ptr = mmap(0,4096,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0);

if(ptr == MAP_FAILED)

{

perror("Error in mapping\n");

exit(1);

}

printf("After mmap\n");

*ptr = 16;

printf("Contents of address 0x%x is :: %d\n",ptr,*ptr);

return 0;

}

Am I doing anything wrong here?

Thank you in advance.

Regards,

Ravi Teja

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