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x86/mm/KASLR: Propagate KASLR status to kernel proper

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Commit:

  e2b32e6785 ("x86, kaslr: randomize module base load address")

made module base address randomization unconditional and didn't regard
disabled KKASLR due to CONFIG_HIBERNATION and command line option
"nokaslr". For more info see (now reverted) commit:

  f47233c2d3 ("x86/mm/ASLR: Propagate base load address calculation")

In order to propagate KASLR status to kernel proper, we need a single bit
in boot_params.hdr.loadflags and we've chosen bit 1 thus leaving the
top-down allocated bits for bits supposed to be used by the bootloader.

Originally-From: Jiri Kosina <[email protected]>
Suggested-by: H. Peter Anvin <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Borislav Petkov 2015-04-01 12:49:52 +02:00 • committed by Ingo Molnar
commit 78cac48c04
8 changed files with 35 additions and 17 deletions
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6
Documentation/x86/boot.txt
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@ -406,6 +406,12 @@ Protocol: 2.00+
- If 0, the protected-mode code is loaded at 0x10000.
- If 1, the protected-mode code is loaded at 0x100000.
Bit 1 (kernel internal): ALSR_FLAG
- Used internally by the compressed kernel to communicate
KASLR status to kernel proper.
If 1, KASLR enabled.
If 0, KASLR disabled.
Bit 5 (write): QUIET_FLAG
- If 0, print early messages.
- If 1, suppress early messages.