scripts/kaslr_patch.sh

   1 #!/bin/sh
   2 # Based on the relocatable vmlinux file and offset create the
   3 # new vmlinux and System.map file. New vmlinux and System.map is
   4 # intend to be used by debugging tools to retrieve the actual
   5 # addresses of symbols in the kernel.
   6 #
   7 # Usage
   8 # mksysmap vmlinux-old  offset
   9
  10 # Author     : Jia Ma (jia.ma@samsung.com)
  11 # Created on :  21 Sep 2015
  12 # Copyright (c) Samsung Electronics 2015
  13
  14 if test $# -ne 2; then
  15         echo "Usage: $0 vmlinux  offset"
  16         exit 1
  17 fi
  18
  19
  20 vmlinux=$1
  21 offset=$2
  22
  23 if [[ -z "$offset" || -z "$vmlinux" ]]; then
  24         echo  "$0 : variable not set"
  25         exit 1
  26 fi
  27
  28 if [[ ! -f $vmlinux ]]; then
  29         echo  "$vmlinux file not exist!"
  30         exit 1
  31 fi
  32
  33 NM=$ARM_TOOLCHAIN-nm
  34 OBJCOPY=$ARM_TOOLCHAIN-objcopy
  35
  36 if [[ -z "$ARM_TOOLCHAIN" ]]; then
  37         echo  "Please specify ARM toolchain"
  38         exit 1
  39 fi
  40
  41 echo  "+Patching System.map --> System.map.patched"
  42 ### generate runtime  System.map file¡¡###
  43 $OBJCOPY --adjust-vma $offset  $vmlinux vmlinux.tmp  2>/dev/null
  44 $NM -n vmlinux.tmp | grep -v '\( [aNUw] \)\|\(__crc_\)\|\( \$[adt]\)' > System.map.patched
  45 rm -f  vmlinux.tmp
  46
  47 echo  "+Patching $vmlinux -->vmlinux.patched"
  48 # following simply change the vmlinux from DYN type to EXEC type
  49 # to avoid the JTag load the dyn symbol into the system: e.g. there will be 2 start_kernel in the JTag symbol list, 1 from SYMBOL table, 1 from RELO section
  50 if [[ ! -f "elfedit" ]]; then
  51         echo "Can find elfedit"
  52         exit 1
  53 fi
  54
  55 cp vmlinux vmlinux.patched
  56 elfedit --output-type exec vmlinux.patched
  57
  58 echo "+Done"
  59
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