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    x86/mm: Add memory hotplug support for KASLR memory randomization · 90397a41
    Thomas Garnier authored
    
    
    Add a new option (CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING) to define
    the padding used for the physical memory mapping section when KASLR
    memory is enabled. It ensures there is enough virtual address space when
    CONFIG_MEMORY_HOTPLUG is used. The default value is 10 terabytes. If
    CONFIG_MEMORY_HOTPLUG is not used, no space is reserved increasing the
    entropy available.
    
    Signed-off-by: default avatarThomas Garnier <thgarnie@google.com>
    Signed-off-by: default avatarKees Cook <keescook@chromium.org>
    Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
    Cc: Alexander Popov <alpopov@ptsecurity.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
    Cc: Baoquan He <bhe@redhat.com>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Borislav Petkov <bp@suse.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Christian Borntraeger <borntraeger@de.ibm.com>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Dave Young <dyoung@redhat.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Dmitry Vyukov <dvyukov@google.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Jan Beulich <JBeulich@suse.com>
    Cc: Joerg Roedel <jroedel@suse.de>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Josh Poimboeuf <jpoimboe@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Lv Zheng <lv.zheng@intel.com>
    Cc: Mark Salter <msalter@redhat.com>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Matt Fleming <matt@codeblueprint.co.uk>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephen Smalley <sds@tycho.nsa.gov>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Toshi Kani <toshi.kani@hpe.com>
    Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
    Cc: Yinghai Lu <yinghai@kernel.org>
    Cc: kernel-hardening@lists.openwall.com
    Cc: linux-doc@vger.kernel.org
    Link: http://lkml.kernel.org/r/1466556426-32664-10-git-send-email-keescook@chromium.org
    
    
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    90397a41