#!/bin/sh

# Do we have the tools we need?

# If no, exit silently.

type /usr/libexec/gdb >/dev/null 2>&1 || exit 0

type eu-readelf >/dev/null 2>&1 || exit 0

# Do we have coredump?

test -r coredump || {

    echo 'No file "coredump" in current directory' >&2

    exit 1

}

# Find "cursig: N" and extract N.

# This gets used by abrt-exploitable as a fallback

# if gdb and/or kernel is uncooperative.

# "grep -m1": take the first match (on Linux, every thread has its own

# prstatus struct in the coredump, but the signal number which killed us

# must be the same in all these structs).

SIGNO_OF_THE_COREDUMP=$(eu-readelf -n coredump | grep -m1 -o 'cursig: *[0-9]*' | sed 's/[^0-9]//g')

export SIGNO_OF_THE_COREDUMP

# Run gdb, hiding its messages. Example:

#   Missing separate debuginfo for the main executable file

#   Core was generated by...

#   Program terminated with signal 11, Segmentation fault.

#   #0  0x09fa5348 in ?? ()

# We don't want to see all this.

# abrt-exploitable plugin is instructed to create ./exploitable file

# with explanation if severity is >= 4

GDBOUT=$(

/usr/libexec/gdb --batch \

    -ex 'python exec(open("/usr/libexec/abrt-gdb-exploitable").read())' \

    -ex 'core-file ./coredump' \

    -ex 'abrt-exploitable 4 ./exploitable' \

    2>&1 \

) && exit 0

# There was an error. Show the messages.

printf "Error while running gdb:\n%s\n" "$GDBOUT"

exit 1