On Thu, Jun 29, 2017 at 9:29 PM, David Laight <david.lai...@aculab.com> wrote: > From: Balbir Singh >> Sent: 28 June 2017 18:04 >> For CONFIG_STRICT_KERNEL_RWX align __init_begin to 16M. >> We use 16M since its the larger of 2M on radix and 16M >> on hash for our linear mapping. The plan is to have >> .text, .rodata and everything upto __init_begin marked >> as RX. Note we still have executable read only data. >> We could further align rodata to another 16M boundary. >> I've used keeping text plus rodata as read-only-executable >> as a trade-off to doing read-only-executable for text and >> read-only for rodata. > ... > > Doesn't this go against 'address space randomisation'? > (Yes I realise a PIC kernel is probably non-trivial to compile > and load.)
I presume you mean Kernel ASLR. I am not sure why you think it goes against KASLR, it's just aligning the _stext and __init_begin, they can be anywhere in memory. I've tested with a relocatable kernel Balbir Singh.
