target/linux/brcm2708/patches-4.9/950-0122-ARM64-Enable-Kernel-Address-Space-Randomization-1792.patch

   1 From 6dfa60daaa0966a8e414ab0a7fd002a99001920a Mon Sep 17 00:00:00 2001
   2 From: Electron752 <mzoran@crowfest.net>
   3 Date: Sat, 14 Jan 2017 02:54:26 -0800
   4 Subject: [PATCH] ARM64: Enable Kernel Address Space Randomization (#1792)
   5
   6 Randomization allows the mapping between virtual addresses and physical
   7 address to be different on each boot.  This makes it more difficult
   8 to exploit security vulnerabilities that require knowledge of fixed
   9 hardware addresses.
  10
  11 The firmware generates a 8 byte random number during bootup and stores
  12 it in the device tree under chosen/kaslr-seed. This number is used
  13 to randomize the address mapping.
  14
  15 This change enables this feature in the build configuration for ARM64.
  16
  17 Signed-off-by: Michael Zoran <mzoran@crowfest.net>
  18 ---
  19  arch/arm64/configs/bcmrpi3_defconfig | 1 +
  20  1 file changed, 1 insertion(+)
  21
  22 --- a/arch/arm64/configs/bcmrpi3_defconfig
  23 +++ b/arch/arm64/configs/bcmrpi3_defconfig
  24 @@ -53,6 +53,7 @@ CONFIG_ARMV8_DEPRECATED=y
  25  CONFIG_SWP_EMULATION=y
  26  CONFIG_CP15_BARRIER_EMULATION=y
  27  CONFIG_SETEND_EMULATION=y
  28 +CONFIG_RANDOMIZE_BASE=y
  29  CONFIG_CMDLINE="console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
  30  CONFIG_BINFMT_MISC=y
  31  CONFIG_COMPAT=y