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#!/bin/bash
# Check if running bash
if [ -z "$BASH" ]; then
echo "This script must be run with bash!"
exit 1
fi
# Check if user have the necessary tools.
for tool in osc xpath cpio rpm2cpio xxd; do
which $tool > /dev/null
if [ $? -ne 0 ]; then
fail "$tool not found, but is necessary by $0"
fi
done
# Color special caracters.
GREEN='\033[1;32m'
RED='\033[0;31m'
YELLOW='\033[1;33m'
BLUE='\033[1;34m'
PURPLE='\033[1;35m'
NC='\033[0m' # No Color
ok () {
echo -e "${GREEN}OK: $1${NC}\n"
}
warn() {
echo -e "${YELLOW}WARNING: $1${NC}\n"
}
fail () {
echo -e "${RED}ERROR: $1${NC}\n"
exit 1
}
# Debug to stderr as some functions use stdout to return info
debug() {
if [[ ! -z "$ULP_DEBUG" ]]; then
echo -e "${BLUE}DEBUG: $1${NC}\n" 1>&2;
fi
}
info () {
echo -e "${PURPLE}$1${NC}\n"
}
is_lib_livepatcheable() {
ULP_NOPS_LEN=16
ULP_PRE_NOPS_LEN=14
ULP_NOP_OPCODE=90
local lib_path=$1
local address_of_a_symbol=`objdump -T $lib_path | grep '\.text' | head -n 1 | awk '{ print $1 }'`
if [ $? -ne 0 ]; then
fail "Unable to find a symbol in $lib_path"
fi
# Convert hexadecimal address in decimal so we can do mathematical operations
local addr_decimal=`printf "%llu" "0x$address_of_a_symbol"`
if [ $addr_decimal -eq 0 ]; then
fail "Symbol at address found is invalid: $address_of_a_symbol"
fi
local ulp_prologue_dec=`expr $addr_decimal - $ULP_PRE_NOPS_LEN`
local ulp_prologue_addr=`printf "0x%lx" $ulp_prologue_dec`
# Get bytes at target library. It should have $ULP_NOPS_LEN nops (0x90 on x86)
local insns=`xxd -s $ulp_prologue_addr -l $ULP_PRE_NOPS_LEN -c $ULP_PRE_NOPS_LEN \
-g $ULP_PRE_NOPS_LEN $lib_path | grep -oEi "($ULP_NOP_OPCODE){$ULP_PRE_NOPS_LEN}"`
# If library is not livepatcheable, insns is empty.
if [ -z "$insns" ]; then
return 1
fi
return 0
}
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