Hi All, This is regarding the KASLR feature support on ARM for the kernel version 4.9 and 4.14. Is KASLR supported on ARM-32 Linux 4.9 and above ? Is it dependent on CONFIG_RANDOMIZE_BASE or /proc/sys/kernel/randomize_va_space ? Is there any relation between these two? Is the changing kernel symbols (in every boot), only possible if KASLR is enabled, or there is another way it can happen? I have these queries because, In one of the arm-32 devices with Kernel 4.14, I observed that CONFIG_RANDOMIZE_BASE is not available. But /proc/sys/kernel/randomize_va_space is set to 2. However, I also observed that symbol addresses are changing in every boot. 1st boot cycle: [root ~]# cat /proc/kallsyms | grep "sys_open" a5b4de92 T sys_open [root@sa515m ~]# 2nd boot cycle: [root ~]# cat /proc/kallsyms | grep "sys_open" f546ed66 T sys_open So, I am wondering how this is possible without KASLR (CONFIG_RANDOMIZE_BASE) support in Kernel ? Similarly, with Kernel 4.9 and CONFIG_RANDOMIZE_BASE is not available but /proc/sys/kernel/randomize_va_space is set to 2. But here, the addresses are remaining same. 1st Run: [root~]# cat /proc/kallsyms | grep "sys_open" c01ed68c T sys_open [root ~]# *** reboot *** [root ~]# cat /proc/kallsyms | grep "sys_open" c01ed68c T sys_open Is there any other difference between these two kernel versions with respect to changing symbol addresses ? Thanks, Pintu _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
