Security Basics mailing list archives
Library address randomization
From: Ricardo Rolim <ricardorolim () hotmail com>
Date: Fri, 23 Jan 2009 01:03:55 +0300
Hi there,
Currently I'm using Fedora 10 and apparently I'm not getting any library address randomization for programs compiled as
PIE. Whereas the binary itself, stack and heap are randomly getting their addresses changed from one execution to the
next, the library stands still at a predictable location. Strangely enough I've got the expected result out of Ubuntu
8.10. This is how I'm checking:
#include
int main() {
printf("printf: %p\n", printf);
printf("main : %p\n", main);
}
[ricardo@localhost ~]$ cat /proc/sys/kernel/randomize_va_space
2
[ricardo@localhost ~]$ cat /proc/sys/kernel/exec-shield
1
[ricardo@localhost ~]$ gcc -fpie -pie -o dummy dummy.c
[ricardo@localhost ~]$ ./dummy
printf: 0x17c900
main : 0xb7f8851c
[ricardo@localhost ~]$ ./dummy
printf: 0x17c900
main : 0xb7f5051c
Am I missing something? Thanks a lot :)
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Current thread:
- Library address randomization Ricardo Rolim (Jan 22)
- Re: Library address randomization kalgecin () gmail com (Jan 23)
- Re: Library address randomization Chris McCulloh (Jan 23)
