driver/patchko.sh

   1 #!/bin/sh
   2 opt=$1
   3 patch_file=$2
   4 output_file=$3
   5 data_file=$4
   6
   7 objdump=$3
   8 readelf=$4
   9
  10 howto()
  11 {
  12     echo " $0 -r <patchingfile.ko> <readelf> <objdump>"
  13     echo " $0 -g <patchingfile.ko> <readelf> <objdump>"
  14     echo " $0 -p <patchingfile.ko> <outputfile.ko> <patchdata>"
  15 }
  16
  17 DEBUG_OFF=1
  18
  19 debug(){
  20     if [ $DEBUG_OFF -eq 0 ];then
  21        echo "patchko.sh) $1"
  22     fi
  23 }
  24
  25 debugmk(){
  26     echo "patchko.sh) $1"
  27 }
  28
  29 error(){
  30     debugmk "[Err]$1"
  31 }
  32
  33 #toolchain=~/Work/tools/u1_slp/toolchai
  34 #cross=${toolchain}/bin/arm-none-linux-gnueabi-
  35 #cross=arm-none-linux-gnueabi-
  36
  37 sect_name="modinfo"
  38 varname="vermagic"
  39 debug "patchfile <$patch_file>"
  40
  41 if [ -f "$patch_file" ]; then
  42
  43     if [ "$opt" = "-p" ];then
  44     #set version (use only on target)
  45         debug "Set version (patching) to <$patch_file>"
  46         if [ -f "$data_file" ];then
  47             cp -f "${patch_file}" "${output_file}"
  48
  49             #get patching adderes
  50             pos=$((`cat $patch_file.addr | awk '{print \$1}'`))
  51             abs_len=$((`cat $patch_file.addr | awk '{print \$2}'`))
  52
  53             key_before=`dd if="$patch_file" bs=1 skip=${pos}c count=${abs_len}c 2>/dev/null`
  54             debug "key_before<$key_before>"
  55             key_before_tail=${key_before#*\ }
  56             debug "key_before_tail<$key_before_tail>"
  57             echo -ne "`cat $data_file` $key_before_tail\000">$data_file
  58
  59             key_len="`cat $data_file`"
  60             key_len=$((${#key_len}+1))
  61
  62             debug "POS>$pos<"
  63             debug "OLDLEN>$abs_len<"
  64             debug "NEWLEN>$key_len<"
  65             debug "PATCH_TO>`cat $data_file`<"
  66
  67             debug "key_len=$key_len"
  68             if [ $key_len -le ${abs_len} ];then
  69                 debug "before=<$key_before>"
  70                 res=`dd if="${data_file}" of="${output_file}" bs=1 seek=${pos} skip=0c count=${key_len}c conv=notrunc 2>/dev/null`
  71
  72                 res=`dd if="$output_file" bs=1 skip=${pos}c count=${abs_len}c 2>/dev/null`
  73                 debug "patched=<$res>"
  74             else
  75                 error "Error on patching <${patch_file}>:data file <$data_file> NEW KEY TOO LONG"
  76                 error "CHECK YOUR KERNEL USED ON COMPILE SWAP IF YOU READ IT"
  77                 exit 254
  78             fi
  79         else
  80             error "Error on patching <${patch_file}>:data file <$data_file> not found"
  81             exit 255
  82         fi
  83     else
  84     #if[ "$opt" != "-p" ];then
  85         debug "+not p"
  86
  87         $readelf -v
  88         if [ $? -ne 0 ];then
  89             error "readelf not found on path <$readelf>"
  90             exit 2
  91         fi
  92         $objdump -v
  93         if [ $? -ne 0 ];then
  94             error "objdump not found on path <$objdump>"
  95             exit 1
  96         fi
  97
  98         file_size=$((`ls -la "$patch_file" | awk '{print \$5}'`))
  99         debugmk "file_size=$file_size"
 100
 101         section=`$readelf -e $patch_file | grep ${sect_name}`
 102         section=${section##*${sect_name}}
 103         debugmk "section=$section"
 104
 105         addr=$((0x`echo $section | awk '{print $2}'`))
 106         offs=$((0x`echo $section | awk '{print $3}'`))
 107         size=$((0x`echo $section | awk '{print $4}'`))
 108         debugmk $addr:$offs:$size
 109
 110         abs_len=$((0x`$objdump -t -j .${sect_name} "$patch_file" | grep _${varname} | awk '{print $5}'`))
 111         abs_len=$(($abs_len-${#varname}-1))
 112         sect_off=$((0x`$objdump -t -j .${sect_name} "$patch_file" | grep _${varname} | awk '{print $1}'`))
 113         add_off=$((${#varname}+1))
 114
 115         abs_addr=$((${addr}+${offs}+${sect_off}+${add_off}))
 116         debugmk "abs_addr=$abs_addr;"
 117         debugmk "abs_len=$abs_len"
 118         if [ "$opt" = "-r" ];then
 119         #read version (for patch testing)
 120             debugmk "Read version in <$patch_file>"
 121             res=`dd if="$patch_file" bs=1 skip=${abs_addr}c count=${abs_len}c 2>/dev/null`
 122             debugmk "ver<$res>"
 123         elif [ "$opt" = "-g" ];then
 124         #gen file version (use only on host)
 125             debugmk "Generate version data for <$patch_file>"
 126             #res=`dd if="$patch_file" of="$patch_file.addr" bs=1 skip=${abs_addr}c count=${abs_len}c`
 127             if [ "$abs_addr" = "" ];then
 128                 debugmk "ERROR cannot get absolute addres of module info line for patching"
 129                 exit 253
 130             elif [ "$abs_len" = "" ];then
 131                 debugmk "ERROR cannot get length of module info line for patching"
 132                 exit 252
 133             else
 134                 echo "$abs_addr $abs_len">"$patch_file.addr"
 135             fi
 136             debugmk "patch_addr=`cat $patch_file.addr`"
 137         else
 138             error "Wrong param <$opt>"
 139         fi
 140     fi
 141 else
 142     error "file for patchig not found <$patch_file>"
 143     fi