56 lines · bash
1#!/usr/bin/env bash2 3# The lines that we're looking to symbolize look like this:4 #0 ./a.out(_foo+0x3e6) [0x55a52e64c696]5# ... which come from the backtrace_symbols() symbolisation function used by6# default in Scudo's implementation of GWP-ASan.7 8while read -r line; do9 # Check that this line needs symbolization.10 should_symbolize="$(echo $line |\11 grep -E '^[ ]*\#.*\(.*\+0x[0-9a-f]+\) \[0x[0-9a-f]+\]$')"12 13 if [ -z "$should_symbolize" ]; then14 echo "$line"15 continue16 fi17 18 # Carve up the input line into sections.19 binary_name="$(echo $line | grep -oE ' .*\(' | rev | cut -c2- | rev |\20 cut -c2-)"21 function_name="$(echo $line | grep -oE '\([^+]*' | cut -c2-)"22 function_offset="$(echo $line | grep -oE '\(.*\)' | grep -oE '\+.*\)' |\23 cut -c2- | rev | cut -c2- | rev)"24 frame_number="$(echo $line | grep -oE '\#[0-9]+ ')"25 26 if [ -z "$function_name" ]; then27 # If the offset is binary-relative, just resolve that.28 symbolized="$(echo $function_offset | addr2line -ie $binary_name)"29 else30 # Otherwise, the offset is function-relative. Get the address of the31 # function, and add it to the offset, then symbolize.32 function_addr="0x$(echo $function_offset |\33 nm --defined-only $binary_name 2> /dev/null |\34 grep -E " $function_name$" | cut -d' ' -f1)"35 36 # Check that we could get the function address from nm.37 if [ -z "$function_addr" ]; then38 echo "$line"39 continue40 fi41 42 # Add the function address and offset to get the offset into the binary.43 binary_offset="$(printf "0x%X" "$((function_addr+function_offset))")"44 symbolized="$(echo $binary_offset | addr2line -ie $binary_name)"45 fi46 47 # Check that it symbolized properly. If it didn't, output the old line.48 echo $symbolized | grep -E ".*\?.*:" > /dev/null49 if [ "$?" -eq "0" ]; then50 echo "$line"51 continue52 else53 echo "${frame_number}${symbolized}"54 fi55done 2> >(grep -v "addr2line: DWARF error: could not find variable specification")56