Messages in this thread | | | Date | Sun, 1 Mar 2015 21:29:38 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH 1/8] x86, kaslr: get kaslr_enabled back correctly |
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On Sun, Mar 01, 2015 at 12:24:08PM -0800, Yinghai Lu wrote: > static allocation in misc.c can not be used to kernel/head_64.S stage safely.
Correct. One possibility that works is sticking it right below LOAD_PHYSICAL_ADDR:
+static void add_kaslr_setup_data(struct boot_params *params, + u8 *output, __u8 enabled) { + /* + * Stick it right under LOAD_PHYSICAL_ADDR + */ + ksd = (struct setup_data *)(output - 2 * sizeof(struct setup_data));
output is LOAD_PHYSICAL_ADDR AFAICT and is the minimum kASLR considers so right below it should work:
https://lkml.kernel.org/r/20150228105049.GA11038@pd.tnic
-- Regards/Gruss, Boris.
ECO tip #101: Trim your mails when you reply. --
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