Hello Ratheesh,
I have intentionally used MAP_FIXED flag as I am interested in mapping to 0x00000000.
Even after setting the mmap_min_addr in /proc/sys/vm to 0 (which was previously 4096), I am getting this error.
Is there anything wrong that I am doing?
On Sat, Sep 21, 2013 at 7:17 PM, ratheesh kannoth <ratheesh.ksz@xxxxxxxxx> wrote:
MAP_FIXED could be trying to get a map from 0.Pls remove this flag and try.
On Sat, Sep 21, 2013 at 6:55 PM, Ravi Teja <ravi2j@xxxxxxxxx> wrote:
_______________________________________________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
Kernelnewbies mailing list
Kernelnewbies@xxxxxxxxxxxxxxxxx
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
