Messages in this thread | | | Date | Thu, 26 May 2011 16:40:30 -0400 | From | Vivek Goyal <> | Subject | Re: [RFC][PATCH] Randomize kernel base address on boot |
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On Thu, May 26, 2011 at 04:35:02PM -0400, Vivek Goyal wrote: > 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.
Resending this mail as in last message I got the email address of Dan wrong and mail bounced. Sorry about that.
Thanks Vivek
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