| Date | Thu, 26 May 2011 16:35:02 -0400 | From | Vivek Goyal <> | Subject | Re: [RFC][PATCH] Randomize kernel base address on boot |
| |
On Tue, May 24, 2011 at 04:31:45PM -0400, Dan Rosenberg wrote: > This introduces CONFIG_RANDOMIZE_BASE, which randomizes the address at > which the kernel is decompressed at boot as a security feature that > deters exploit attempts relying on knowledge of the location of kernel > internals. The default values of the kptr_restrict and dmesg_restrict > sysctls are set to (1) when this is enabled, since hiding kernel > pointers is necessary to preserve the secrecy of the randomized base > address.
What happens to /proc/iomem interface which gives us the physical memory location where kernel is loaded. kexec-tools relies on that interface heavily so we can not take it away. And if we can not take it away then I think somebody should be easibly be able to calculate this randomized base address.
Thanks Vivek
|