x86/mm/64: Enable KASLR for vmemmap memory region

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Add vmemmap in the list of randomized memory regions.

The vmemmap region holds a representation of the physical memory (through
a struct page array). An attacker could use this region to disclose the
kernel memory layout (walking the page linked list).

Signed-off-by: Thomas Garnier <thgarnie@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kernel-hardening@lists.openwall.com
Link: http://lkml.kernel.org/r/1469635196-122447-1-git-send-email-thgarnie@google.com
[ Minor edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

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This commit is contained in:

Thomas Garnier 2016-07-27 08:59:56 -07:00 • committed by Ingo Molnar

parent 404f6aac9b

commit 25dfe47853

3 changed files with 28 additions and 3 deletions

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1

arch/x86/include/asm/kaslr.h

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4

arch/x86/include/asm/pgtable_64_types.h

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26

arch/x86/mm/kaslr.c

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